Pub Date : 2021-02-26DOI: 10.1109/CPEEE51686.2021.9383240
Min-Chin Lee, Cheng-Han Li, Xiao-Xuan Yang
This paper implements a low-power PFM boost power converter that can be applied to low-voltage energy harvesting systems, such as in the IoT intelligent micro-sensing power module or energy harvesting interface circuit. The interface circuit can provide power management functions between the energy harvesting device and the electric load. The power converter uses the PFM feedback control mechanism to implement a boost converter which can stabilize the output voltage when the input voltage and load change. And when the input voltage of the PFM boost power converter circuit is less than the transition voltage of the Schmitt triggered inverter circuit, the PFM control circuit of the power converter will stop operating the feedback control regulation process, and the boost power converter will enter the standby mode. Therefore, the static power consumption of the boost power converter is minimized. The overall circuit is simulated and designed using TSMC 0.35um 2P4M CMOS process technology. The converter having 0.324x0.43015 mm2 chip size and power dissipation about 2.287mW. This chip can operate with input supply voltage from 2.0V to 2.5V, and its output voltage can stable at 3.0V and less than 20mV ripple voltage at maximum output current 10mA. The converter with a load regulation is less than 0.944mV/mA and the line voltage regulation is less than 34.6mV/V.
{"title":"Implementation of DC-DC PFM Boost Power Converter for Low-power Energy Harvesting Applications","authors":"Min-Chin Lee, Cheng-Han Li, Xiao-Xuan Yang","doi":"10.1109/CPEEE51686.2021.9383240","DOIUrl":"https://doi.org/10.1109/CPEEE51686.2021.9383240","url":null,"abstract":"This paper implements a low-power PFM boost power converter that can be applied to low-voltage energy harvesting systems, such as in the IoT intelligent micro-sensing power module or energy harvesting interface circuit. The interface circuit can provide power management functions between the energy harvesting device and the electric load. The power converter uses the PFM feedback control mechanism to implement a boost converter which can stabilize the output voltage when the input voltage and load change. And when the input voltage of the PFM boost power converter circuit is less than the transition voltage of the Schmitt triggered inverter circuit, the PFM control circuit of the power converter will stop operating the feedback control regulation process, and the boost power converter will enter the standby mode. Therefore, the static power consumption of the boost power converter is minimized. The overall circuit is simulated and designed using TSMC 0.35um 2P4M CMOS process technology. The converter having 0.324x0.43015 mm2 chip size and power dissipation about 2.287mW. This chip can operate with input supply voltage from 2.0V to 2.5V, and its output voltage can stable at 3.0V and less than 20mV ripple voltage at maximum output current 10mA. The converter with a load regulation is less than 0.944mV/mA and the line voltage regulation is less than 34.6mV/V.","PeriodicalId":314015,"journal":{"name":"2021 11th International Conference on Power, Energy and Electrical Engineering (CPEEE)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126098246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Modular multilevel converter (MMC) has broad application prospects in new energy transmission. When a MMC is connected to an active AC grid, it is necessary to calculate the three-phase symmetrical short-circuit current contribution of MMC to ensure the safety of power system. The existing method used in actual engineering projects consider MMC as a current source of which the amplitude is the current limiting amplitude of current limiter. It is safe but has too much margin to be accurate. This paper proposes a new method to calculate short-circuit current that can be used in actual engineering project. This paper analyses the characteristics of MMC short-circuit current first, and proposes the key factors affect short-circuit current contributed by MMC during an actual operating condition. On this basis, simulation trials on advanced digital power system simulator (ADPSS) are designed to get the characteristic curves of short-circuit current which can be used to calculate short-circuit current in actual operation of the engineering project. Finally, this paper uses Zhangbei MMC-HVDC project as an example to apply the new method and show the effectiveness and superiority of the method proposed by this paper.
{"title":"ADPSS Based Short-circuit Current Calculation Method of MMC","authors":"Xiao Yu, Shanshan Wang, Bing Zhao, Zhida Su, Hongfu Wang, Hongying Peng","doi":"10.1109/CPEEE51686.2021.9383389","DOIUrl":"https://doi.org/10.1109/CPEEE51686.2021.9383389","url":null,"abstract":"Modular multilevel converter (MMC) has broad application prospects in new energy transmission. When a MMC is connected to an active AC grid, it is necessary to calculate the three-phase symmetrical short-circuit current contribution of MMC to ensure the safety of power system. The existing method used in actual engineering projects consider MMC as a current source of which the amplitude is the current limiting amplitude of current limiter. It is safe but has too much margin to be accurate. This paper proposes a new method to calculate short-circuit current that can be used in actual engineering project. This paper analyses the characteristics of MMC short-circuit current first, and proposes the key factors affect short-circuit current contributed by MMC during an actual operating condition. On this basis, simulation trials on advanced digital power system simulator (ADPSS) are designed to get the characteristic curves of short-circuit current which can be used to calculate short-circuit current in actual operation of the engineering project. Finally, this paper uses Zhangbei MMC-HVDC project as an example to apply the new method and show the effectiveness and superiority of the method proposed by this paper.","PeriodicalId":314015,"journal":{"name":"2021 11th International Conference on Power, Energy and Electrical Engineering (CPEEE)","volume":"163 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122433697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-26DOI: 10.1109/CPEEE51686.2021.9383399
Yang Wang, Wenbing Xi, Jian Chen, Ming Chen
With a large number of DG access to the distribution network, power quality problems and challenge of fault line selection are caused. It is important to monitor the node voltage and current of distribution network. In this paper, a deployment method of micro-synchronization monitoring terminal for distribution network fault diagnosis with DG access is proposed. According to whether there is relay protection device, the line is divided into protected line and unprotected line. Then, the rapid isolation deployment method is adopted for the protected lines. Meanwhile, according to the user demands, the unprotected lines are divided into precise decision line and fuzzy decision line. Finally, precise decision algorithm and fuzzy decision algorithm are used respectively for the precise decision lines and fuzzy decision lines. To verify the effectiveness of the method, a DG-containing distribution network was built in matlab, and the result shows that the method is effective.
{"title":"A Deployment Method of Micro-Synchronization Monitoring Terminal for Distribution Network Fault Diagnosis with DG Access","authors":"Yang Wang, Wenbing Xi, Jian Chen, Ming Chen","doi":"10.1109/CPEEE51686.2021.9383399","DOIUrl":"https://doi.org/10.1109/CPEEE51686.2021.9383399","url":null,"abstract":"With a large number of DG access to the distribution network, power quality problems and challenge of fault line selection are caused. It is important to monitor the node voltage and current of distribution network. In this paper, a deployment method of micro-synchronization monitoring terminal for distribution network fault diagnosis with DG access is proposed. According to whether there is relay protection device, the line is divided into protected line and unprotected line. Then, the rapid isolation deployment method is adopted for the protected lines. Meanwhile, according to the user demands, the unprotected lines are divided into precise decision line and fuzzy decision line. Finally, precise decision algorithm and fuzzy decision algorithm are used respectively for the precise decision lines and fuzzy decision lines. To verify the effectiveness of the method, a DG-containing distribution network was built in matlab, and the result shows that the method is effective.","PeriodicalId":314015,"journal":{"name":"2021 11th International Conference on Power, Energy and Electrical Engineering (CPEEE)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128778970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-26DOI: 10.1109/CPEEE51686.2021.9383373
Jiaxin Ding
With the development of intelligent distribution networks and the increasing demand for new energy access, solid state transformers (SSTs) have become a key link in modern energy transformation systems. In order to realize the functions of electrical transformation and electrical isolation of three-phase AC-single-phase communication, this paper proposes a structure of SST from three-phase alternating current to single-phase alternating current based on three-phase uncontrolled rectification, isolated DC/DC converter and single-phase inverter, and analyzes it in detail. The proposed SST can not only realize voltage transformation from three-phase AC to single-phase AC, but also have voltage regulation and fault isolation functions. Finally, based on the MATLAB/Simulink simulation platform, the proposed five-stage SST topology is built and verified by simulation. The structure of SST not only has the functions of voltage transformation and electrical isolation, but also has fault isolation, reactive power compensation, power flow control and other functions.
{"title":"Design and Implementation of Three-phase to single-phase AC Solid State Transformer","authors":"Jiaxin Ding","doi":"10.1109/CPEEE51686.2021.9383373","DOIUrl":"https://doi.org/10.1109/CPEEE51686.2021.9383373","url":null,"abstract":"With the development of intelligent distribution networks and the increasing demand for new energy access, solid state transformers (SSTs) have become a key link in modern energy transformation systems. In order to realize the functions of electrical transformation and electrical isolation of three-phase AC-single-phase communication, this paper proposes a structure of SST from three-phase alternating current to single-phase alternating current based on three-phase uncontrolled rectification, isolated DC/DC converter and single-phase inverter, and analyzes it in detail. The proposed SST can not only realize voltage transformation from three-phase AC to single-phase AC, but also have voltage regulation and fault isolation functions. Finally, based on the MATLAB/Simulink simulation platform, the proposed five-stage SST topology is built and verified by simulation. The structure of SST not only has the functions of voltage transformation and electrical isolation, but also has fault isolation, reactive power compensation, power flow control and other functions.","PeriodicalId":314015,"journal":{"name":"2021 11th International Conference on Power, Energy and Electrical Engineering (CPEEE)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134234621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-26DOI: 10.1109/CPEEE51686.2021.9383414
Zhang Ying, Ren Hongtao
With the rapid development of industry, large capacity impact load, such as high-power water pump with soft start, industrial arc furnace and so on, causes active and reactive power impact and a large number of harmonic injection in the production and operation process, which has a serious impact on the power quality of the distribution network. Based on PSAF software, a simulation model of an impact load connected to the distribution network is established, and the bus bar connected to the common point is affected. The paper analyzes and evaluates the harmonic, voltage imbalance and voltage fluctuation of the bus bar, and expounds the influence of large capacity fluctuating load such as electric arc furnace on the power quality of distribution network. The analysis results show that the large capacity impact load easily causes the power quality index of distribution network to exceed the limit. The SVG+FC compensation device is used to compensate, which will lead to the SVG capacity greatly reduced, and the cost and investment of the project are reduced to the greatest extent. Moreover, the fast operation speed of SVG can effectively solve the problems of harmonic filtering and reactive power compensation, which can meet the requirements of all aspects of real-time compensation. After compensation, the power quality of the common point is significantly improved, and the economy and operation flexibility of the compensation device are good.
{"title":"Influence and Suppression of Large Capacity Impact Load on Power Quality of Power System","authors":"Zhang Ying, Ren Hongtao","doi":"10.1109/CPEEE51686.2021.9383414","DOIUrl":"https://doi.org/10.1109/CPEEE51686.2021.9383414","url":null,"abstract":"With the rapid development of industry, large capacity impact load, such as high-power water pump with soft start, industrial arc furnace and so on, causes active and reactive power impact and a large number of harmonic injection in the production and operation process, which has a serious impact on the power quality of the distribution network. Based on PSAF software, a simulation model of an impact load connected to the distribution network is established, and the bus bar connected to the common point is affected. The paper analyzes and evaluates the harmonic, voltage imbalance and voltage fluctuation of the bus bar, and expounds the influence of large capacity fluctuating load such as electric arc furnace on the power quality of distribution network. The analysis results show that the large capacity impact load easily causes the power quality index of distribution network to exceed the limit. The SVG+FC compensation device is used to compensate, which will lead to the SVG capacity greatly reduced, and the cost and investment of the project are reduced to the greatest extent. Moreover, the fast operation speed of SVG can effectively solve the problems of harmonic filtering and reactive power compensation, which can meet the requirements of all aspects of real-time compensation. After compensation, the power quality of the common point is significantly improved, and the economy and operation flexibility of the compensation device are good.","PeriodicalId":314015,"journal":{"name":"2021 11th International Conference on Power, Energy and Electrical Engineering (CPEEE)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116106364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-26DOI: 10.1109/CPEEE51686.2021.9383415
Palash Mishra
Composite insulators with polymeric housing are been increasingly used over porcelain and glass insulators in outdoor high voltage insulation structures due to some specific advantages such as light weight, high mechanical strength and better contamination resistance. Among several other used housing material silicone rubber (SIR) is highly preferred for electric power transmission networks operating at an extra-high voltage (EHV) and ultra-high voltage (UHV) levels because of its high hydrophobicity and hydrophobicity transfer capability. However, being organic in nature, polymeric housings degrade gradually with time and accessing their long-term service performance is a big issue. In general, twelve parameters are being identified by CIGRE WG D1-14 to access the health of polymeric insulating material and standardized test methods for accessing eight properties have already been specified. Therefore, this work comprehensively reports the state of the art with regard to the condition monitoring techniques/test methods being adopted for evaluating remaining four parameters viz. hydrophobicity, the resistance against corona discharge, flammability and UV weathering.
聚合物外壳复合绝缘子由于其重量轻、机械强度高、抗污染性能好等特殊优点，在室外高压绝缘结构中越来越多地应用于瓷绝缘子和玻璃绝缘子之上。在其他几种常用的外壳材料中，硅橡胶(SIR)由于其高疏水性和疏水性转移能力，在特高压(EHV)和特高压(UHV)水平下运行的电力传输网络中非常受欢迎。然而，聚合物外壳本质上是有机的，随着时间的推移会逐渐降解，并且如何获得其长期使用性能是一个大问题。一般来说，CIGRE WG D1-14正在确定12个参数，以评估聚合物绝缘材料的健康状况，并且已经规定了用于评估8种性能的标准化测试方法。因此，本文全面报道了用于评估剩余四个参数(疏水性、抗电晕放电、可燃性和紫外线风化)的状态监测技术/测试方法的最新进展。
{"title":"Condition Monitoring of High Voltage Composite Insulators: Recent Trends and Findings","authors":"Palash Mishra","doi":"10.1109/CPEEE51686.2021.9383415","DOIUrl":"https://doi.org/10.1109/CPEEE51686.2021.9383415","url":null,"abstract":"Composite insulators with polymeric housing are been increasingly used over porcelain and glass insulators in outdoor high voltage insulation structures due to some specific advantages such as light weight, high mechanical strength and better contamination resistance. Among several other used housing material silicone rubber (SIR) is highly preferred for electric power transmission networks operating at an extra-high voltage (EHV) and ultra-high voltage (UHV) levels because of its high hydrophobicity and hydrophobicity transfer capability. However, being organic in nature, polymeric housings degrade gradually with time and accessing their long-term service performance is a big issue. In general, twelve parameters are being identified by CIGRE WG D1-14 to access the health of polymeric insulating material and standardized test methods for accessing eight properties have already been specified. Therefore, this work comprehensively reports the state of the art with regard to the condition monitoring techniques/test methods being adopted for evaluating remaining four parameters viz. hydrophobicity, the resistance against corona discharge, flammability and UV weathering.","PeriodicalId":314015,"journal":{"name":"2021 11th International Conference on Power, Energy and Electrical Engineering (CPEEE)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114164311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-26DOI: 10.1109/CPEEE51686.2021.9383340
Netha AM Silalahi, Baskoro Widanarko, Saravana Kumar Jaganathan
Superheater as a part of thermal steam power plant could be damaged by deposit. If there is no significant degradation of material, in concern of reliability of power plant, the deposit could be removed by chemical cleaning. Alkali chemical cleaning is chosen since the material is sensitive to low pH and the chemical composition of deposit analysis. Process parameter is monitored continuously. After chemical treatment, there is even distribution of temperature on superheater tubes describes the better heat distribution at superheater tubes (Δ T = 10 – 25 °C) and also Furnace Exit Gas Temperature (Δ T = 50 °C) reduced significantly indicating the better heat transfer in boiler. Improvement of heat transfer of boiler as the result of proper chemical cleaning maybe beneficial in improving the boiler efficiency
过热器作为热电厂的一部分，有可能因积垢而损坏。如果材料没有明显的降解，考虑到电厂的可靠性，可以用化学清洗去除沉积物。由于物料对低pH值和沉积物的化学成分分析敏感，因此选择碱化学清洗。连续监测工艺参数。经过化学处理后，过热器管内的温度分布均匀，说明过热器管内的热量分布较好(Δ T = 10 - 25°C)，炉膛出口气体温度(Δ T = 50°C)显著降低，表明锅炉内传热较好。适当的化学清洗可以改善锅炉的传热，从而提高锅炉的效率
{"title":"Impact of Chemical Cleaning on Furnace Exit Gas Temperature of Power Plant:Case Study Steam Power Plant Unit 1","authors":"Netha AM Silalahi, Baskoro Widanarko, Saravana Kumar Jaganathan","doi":"10.1109/CPEEE51686.2021.9383340","DOIUrl":"https://doi.org/10.1109/CPEEE51686.2021.9383340","url":null,"abstract":"Superheater as a part of thermal steam power plant could be damaged by deposit. If there is no significant degradation of material, in concern of reliability of power plant, the deposit could be removed by chemical cleaning. Alkali chemical cleaning is chosen since the material is sensitive to low pH and the chemical composition of deposit analysis. Process parameter is monitored continuously. After chemical treatment, there is even distribution of temperature on superheater tubes describes the better heat distribution at superheater tubes (Δ T = 10 – 25 °C) and also Furnace Exit Gas Temperature (Δ T = 50 °C) reduced significantly indicating the better heat transfer in boiler. Improvement of heat transfer of boiler as the result of proper chemical cleaning maybe beneficial in improving the boiler efficiency","PeriodicalId":314015,"journal":{"name":"2021 11th International Conference on Power, Energy and Electrical Engineering (CPEEE)","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127249302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-26DOI: 10.1109/CPEEE51686.2021.9383329
J. Hou
The capacity of the optical fiber communication system has increased by more than one thousand times per year in the past forty years. With the emergence of new Internet applications, it cannot meet the demand for huge capacity growth. In this paper, the key technologies for large capacity optical transmission networks are discussed. First, four direct detection optical orthogonal frequency division multiplexing (DDO-OFDM) schemes are studied for short/medium transmission scenarios. Then, coherent optical wavelength division multiplexing (WDM) based on multi-carrier generation technology for long-distance transmission is introduced. Moreover, all-optical wavelength conversion (AOWC) technology is also introduced for coherent optical WDM networks to increase network flexibility.
{"title":"Key Technologies on Large Capacity Optical transmission Networks","authors":"J. Hou","doi":"10.1109/CPEEE51686.2021.9383329","DOIUrl":"https://doi.org/10.1109/CPEEE51686.2021.9383329","url":null,"abstract":"The capacity of the optical fiber communication system has increased by more than one thousand times per year in the past forty years. With the emergence of new Internet applications, it cannot meet the demand for huge capacity growth. In this paper, the key technologies for large capacity optical transmission networks are discussed. First, four direct detection optical orthogonal frequency division multiplexing (DDO-OFDM) schemes are studied for short/medium transmission scenarios. Then, coherent optical wavelength division multiplexing (WDM) based on multi-carrier generation technology for long-distance transmission is introduced. Moreover, all-optical wavelength conversion (AOWC) technology is also introduced for coherent optical WDM networks to increase network flexibility.","PeriodicalId":314015,"journal":{"name":"2021 11th International Conference on Power, Energy and Electrical Engineering (CPEEE)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125486607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-26DOI: 10.1109/CPEEE51686.2021.9383412
Yaoqin Jia, Biao Jia, Yijie Hou, Junjie Xiao, W. Zhao, Po Huang, Anle Xia
Bidirectional DC/DC converter is widely used in battery charge/discharge systems. The traditional state space average analysis method is not accurate enough when digital control is adopted. The separate analysis of the circuit from charge and discharge modes and design two sets of controllers will evidently reduce reliability and increase complexity of the system. Based on the discrete time modelling method, this paper establishes a unified discrete time model for current reversible chopper circuit. Then based on bilinear transformation method, design digital PI controller that can be directly applied according to the frequency domain index. By utilizing a unified current controller, accurate, fast and stable constant current charging/discharging control and switch can be realized. Voltage controller is used to realize constant voltage charging control. Finally, the validity and accuracy of the unified discrete-time model, unified current control strategy and digital controller design method proposed in this paper are further verified by simulation and experiments.
{"title":"Unified Discrete-time Modeling and Digital Control of Bidirectional Chopper Converter","authors":"Yaoqin Jia, Biao Jia, Yijie Hou, Junjie Xiao, W. Zhao, Po Huang, Anle Xia","doi":"10.1109/CPEEE51686.2021.9383412","DOIUrl":"https://doi.org/10.1109/CPEEE51686.2021.9383412","url":null,"abstract":"Bidirectional DC/DC converter is widely used in battery charge/discharge systems. The traditional state space average analysis method is not accurate enough when digital control is adopted. The separate analysis of the circuit from charge and discharge modes and design two sets of controllers will evidently reduce reliability and increase complexity of the system. Based on the discrete time modelling method, this paper establishes a unified discrete time model for current reversible chopper circuit. Then based on bilinear transformation method, design digital PI controller that can be directly applied according to the frequency domain index. By utilizing a unified current controller, accurate, fast and stable constant current charging/discharging control and switch can be realized. Voltage controller is used to realize constant voltage charging control. Finally, the validity and accuracy of the unified discrete-time model, unified current control strategy and digital controller design method proposed in this paper are further verified by simulation and experiments.","PeriodicalId":314015,"journal":{"name":"2021 11th International Conference on Power, Energy and Electrical Engineering (CPEEE)","volume":"191 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121734668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-26DOI: 10.1109/CPEEE51686.2021.9383342
Rong Jin
Moon exploration is an attractive research of interest especially along with the development of lunar vehicle technologies in the past decades. Here, a small lunar vehicle prototype with a foldable mechanism was proposed. It can fold and unfold in the lunar environment, which can reduce the volume by about 20%. The robotic arm of the lunar rover which incorporates the camera into its end-effector also helps reduce the number of vision sensors and extra energy consumption. Besides, a combination of solar panels and compact nuclear batteries can ensure the rover's endurance of operation on the moon. In addition, the folding process of the lunar rover, the ability to go uphill and downhill, and the ability to pass over obstacles are simulated in SOLIDWORKS MOTION. Accordingly, two optimization schemes, including adding more suspension systems and automatic route planning systems, are proposed. With the development of the foldable lunar vehicle, it became possible for large number of lunar vehicles to be sent to the moon in one time, which also provided the basis for the commercialization of the moon landing.
{"title":"The Conceptional Design and Simulation of a Foldable Lunar Vehicle","authors":"Rong Jin","doi":"10.1109/CPEEE51686.2021.9383342","DOIUrl":"https://doi.org/10.1109/CPEEE51686.2021.9383342","url":null,"abstract":"Moon exploration is an attractive research of interest especially along with the development of lunar vehicle technologies in the past decades. Here, a small lunar vehicle prototype with a foldable mechanism was proposed. It can fold and unfold in the lunar environment, which can reduce the volume by about 20%. The robotic arm of the lunar rover which incorporates the camera into its end-effector also helps reduce the number of vision sensors and extra energy consumption. Besides, a combination of solar panels and compact nuclear batteries can ensure the rover's endurance of operation on the moon. In addition, the folding process of the lunar rover, the ability to go uphill and downhill, and the ability to pass over obstacles are simulated in SOLIDWORKS MOTION. Accordingly, two optimization schemes, including adding more suspension systems and automatic route planning systems, are proposed. With the development of the foldable lunar vehicle, it became possible for large number of lunar vehicles to be sent to the moon in one time, which also provided the basis for the commercialization of the moon landing.","PeriodicalId":314015,"journal":{"name":"2021 11th International Conference on Power, Energy and Electrical Engineering (CPEEE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131033633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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