Pub Date : 2018-12-01DOI: 10.1109/SPEC.2018.8635845
S. A. Zulkifli, S. Salimin, A. Khairi, Abdul Rahman
This project describes the investigation on the Proportional Resonant (PR) control and its performance for a 7-level multilevel inverter using only 5 switches of devices in the single-phase inverter. The performance of the PR control is measured based on the ability of the controller to reduce the harmonic distortion in the inverter output system when connected to a non-linear load. This project is divided into two parts: firstly by using the MATLAB simulation, and then testing the hardware implementation. The results of the multilevel simulation in MATLAB/Simulink show that the implementation of the PR control in the inverter system can reduce the total harmonic distortion caused by the non-linear load; meanwhile, the hardware results show that the PR controller system is applicable and functioning well for generating a 7-step level using TI microcontroller based on current PR control strategy system.
{"title":"Investigation on Proportional Resonant Current Control for 7-Level Multilevel Inverter with Reduced Switching Device","authors":"S. A. Zulkifli, S. Salimin, A. Khairi, Abdul Rahman","doi":"10.1109/SPEC.2018.8635845","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8635845","url":null,"abstract":"This project describes the investigation on the Proportional Resonant (PR) control and its performance for a 7-level multilevel inverter using only 5 switches of devices in the single-phase inverter. The performance of the PR control is measured based on the ability of the controller to reduce the harmonic distortion in the inverter output system when connected to a non-linear load. This project is divided into two parts: firstly by using the MATLAB simulation, and then testing the hardware implementation. The results of the multilevel simulation in MATLAB/Simulink show that the implementation of the PR control in the inverter system can reduce the total harmonic distortion caused by the non-linear load; meanwhile, the hardware results show that the PR controller system is applicable and functioning well for generating a 7-step level using TI microcontroller based on current PR control strategy system.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123108113","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8635896
B. Bertoldi, Marcio Moura Bridon Junior, M. S. Dall’Asta, Marcos Paulo Mocellini, Greidanus Mateo Daniel Roig, A. Kirsten, M. Heldwein
The life cycle of the Light Emitting Diodes (LEDs) requires a robust and reliable driver since the components may have influence in the lifetime of the lighting system, which is an undesirable situation. In addition, LED strings can be sold for different loads possibilities. This requires the converter components to be designed in a generalized and oversized way. As a consequence, sizable components lead to increased losses mainly in the semiconductors. In the last ones, the forward voltage drops and resistances typically increase relatively to their voltage blocking capacity. This work presents a steady state and dynamic modeling of a SEPIC converter operating in Discontinuous Conduction Mode (DCM) for LED lighting applications, considering non-idealities. Simulations and Hardware-in-the-Loop results are presented to validate the derived dynamic and steady-state models as well as to present a DCM PFC SEPIC rectifier application driving a 72 V-100 W LED lamp from a 220 V-60 Hz grid.
发光二极管(led)的生命周期需要一个强大而可靠的驱动器，因为组件可能会对照明系统的寿命产生影响，这是一个不希望出现的情况。此外，LED串可以出售不同的负载可能性。这就要求转换器元件采用一般化和超大化的设计方式。因此，较大的元件导致损耗增加，主要是在半导体方面。在最后一种情况下，正向电压降和电阻通常相对于它们的电压阻断能力而增加。这项工作提出了一个稳态和动态建模的SEPIC转换器工作在不连续传导模式(DCM)为LED照明应用，考虑到非理想。仿真和硬件在环结果验证了所推导的动态和稳态模型，并给出了一个DCM PFC SEPIC整流器应用，该整流器从220 V-60 Hz电网驱动72 V-100 W LED灯。
{"title":"A Non-Ideal SEPIC DCM Modeling for LED Lighting Applications","authors":"B. Bertoldi, Marcio Moura Bridon Junior, M. S. Dall’Asta, Marcos Paulo Mocellini, Greidanus Mateo Daniel Roig, A. Kirsten, M. Heldwein","doi":"10.1109/SPEC.2018.8635896","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8635896","url":null,"abstract":"The life cycle of the Light Emitting Diodes (LEDs) requires a robust and reliable driver since the components may have influence in the lifetime of the lighting system, which is an undesirable situation. In addition, LED strings can be sold for different loads possibilities. This requires the converter components to be designed in a generalized and oversized way. As a consequence, sizable components lead to increased losses mainly in the semiconductors. In the last ones, the forward voltage drops and resistances typically increase relatively to their voltage blocking capacity. This work presents a steady state and dynamic modeling of a SEPIC converter operating in Discontinuous Conduction Mode (DCM) for LED lighting applications, considering non-idealities. Simulations and Hardware-in-the-Loop results are presented to validate the derived dynamic and steady-state models as well as to present a DCM PFC SEPIC rectifier application driving a 72 V-100 W LED lamp from a 220 V-60 Hz grid.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126060620","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8636032
H. Jahan, M. Abapour, K. Zare, S. Hosseini, Yongheng Yang, F. Blaabjerg
This paper proposes a single source modular multilevel inverter with self-balancing and boosting capabilities. The proposed topology uses several half-bridge cells, load-side switches, and one charging unit. In high-voltage PV applications the load-side switches consisting of several series-connected switches should be employed in the proposed topology. This is termed as the switch string. In the proposed topology, the charging unit charges the capacitors inserted into the modules. The charging process of the capacitors is done using a charging inductor. This inductor can both mitigate the capacitor inrush currents and limit the fault current. Furthermore, the proposed topology draws a continuous current from the dc side. Simulation results, carried out in Matlab/Simulink, are provided to demonstrate the versatility and feasibility of the proposed topology.
{"title":"A Modular Multilevel Converter with Boosting, Self-Balancing, and Scaling Capabilities for High- Voltage Transformerless PV Applications","authors":"H. Jahan, M. Abapour, K. Zare, S. Hosseini, Yongheng Yang, F. Blaabjerg","doi":"10.1109/SPEC.2018.8636032","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8636032","url":null,"abstract":"This paper proposes a single source modular multilevel inverter with self-balancing and boosting capabilities. The proposed topology uses several half-bridge cells, load-side switches, and one charging unit. In high-voltage PV applications the load-side switches consisting of several series-connected switches should be employed in the proposed topology. This is termed as the switch string. In the proposed topology, the charging unit charges the capacitors inserted into the modules. The charging process of the capacitors is done using a charging inductor. This inductor can both mitigate the capacitor inrush currents and limit the fault current. Furthermore, the proposed topology draws a continuous current from the dc side. Simulation results, carried out in Matlab/Simulink, are provided to demonstrate the versatility and feasibility of the proposed topology.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124901625","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8635866
Ziyou Lim, Yong Liu, Lingxi Zhang, J. Pou, R. Simanjorang, A. Gupta
This paper proposes two suitable converter topologies for more electric aircraft (MEA) starter generator application. The commercially available silicon (Si) and silicon carbide (SiC) semiconductor devices are also sourced to fit the given design requirements. Different possible configurations of the evaluated converter topologies are discussed. The rectifier design methodology is presented, considering device loss distribution, converter efficiency, required heatsink thermal resistance, dc-link capacitance sizing, delivered power quality and estimated gravimetric power density. The quantitative evaluations have demonstrated the beneficial needs of driving multilevel converter at higher switching frequency operation using SiC semiconductor technology.
{"title":"Design of 100 kVA SiC Power Converter for Aircraft Electric Starter Generator","authors":"Ziyou Lim, Yong Liu, Lingxi Zhang, J. Pou, R. Simanjorang, A. Gupta","doi":"10.1109/SPEC.2018.8635866","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8635866","url":null,"abstract":"This paper proposes two suitable converter topologies for more electric aircraft (MEA) starter generator application. The commercially available silicon (Si) and silicon carbide (SiC) semiconductor devices are also sourced to fit the given design requirements. Different possible configurations of the evaluated converter topologies are discussed. The rectifier design methodology is presented, considering device loss distribution, converter efficiency, required heatsink thermal resistance, dc-link capacitance sizing, delivered power quality and estimated gravimetric power density. The quantitative evaluations have demonstrated the beneficial needs of driving multilevel converter at higher switching frequency operation using SiC semiconductor technology.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131619291","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8635937
S. Maddugari, V. Borghate, S. Sabyasachi
A reliable multilevel inverter topology with asymmetrical source configuration to sustain switch open circuit faults is proposed in this paper. Under normal operation, with 3:1 ratio of source configuration, the proposed inverter develops 9levels voltage output. The most common faults in semiconductor switches are open circuit faults and also fault in gate driver is treated as an open circuit fault in switch due to a cease in pulses to the corresponding switch. So, this paper analyzes for open circuit faults in switches. The voltage levels and magnitude are fallen for fault in certain switches and connecting a tap-changing transformer at the output maintains the peak voltage magnitude. But, load scheduling is necessary to ensure continual operation of the inverter. The circuit is operated using Nearest Level Control (NLC) technique. The proposed circuit is simulated in MATLAB/SIMULINK and is validated using a developed prototype.
{"title":"Reliable Operation of an Asymmetrical Multilevel Inverter Topology","authors":"S. Maddugari, V. Borghate, S. Sabyasachi","doi":"10.1109/SPEC.2018.8635937","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8635937","url":null,"abstract":"A reliable multilevel inverter topology with asymmetrical source configuration to sustain switch open circuit faults is proposed in this paper. Under normal operation, with 3:1 ratio of source configuration, the proposed inverter develops 9levels voltage output. The most common faults in semiconductor switches are open circuit faults and also fault in gate driver is treated as an open circuit fault in switch due to a cease in pulses to the corresponding switch. So, this paper analyzes for open circuit faults in switches. The voltage levels and magnitude are fallen for fault in certain switches and connecting a tap-changing transformer at the output maintains the peak voltage magnitude. But, load scheduling is necessary to ensure continual operation of the inverter. The circuit is operated using Nearest Level Control (NLC) technique. The proposed circuit is simulated in MATLAB/SIMULINK and is validated using a developed prototype.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133459632","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8635863
F. Grimm, Zhenbin Zhang
We propose a novel multistep model predictive current control framework for synchronous machines. The proposed framework is based on the mathematical structure of the system model in different coordinate systems. Since the dynamics of the stator currents of the machine are independent of each other, it is possible to decouple them within the cost function in stationary coordinate frames. Based on this properties, a multistep prediction model is established. In order to obtain the optimal solution efficiently, we furthermore propose a specialized sphere decoder-based algorithm that is tailored to decoupled current control. Compared to existing approaches the proposed method does not require any matrix inversion ir decomposition for the formulation of the optimization problem. For this reason it is especially suitable for electric drive systems with large and or rank deficient system matrices. The framework is verified with the help of numerical simulations.
{"title":"Decoupled Multistep Model Predictive Control of Permanent Magnet Synchronous Machines","authors":"F. Grimm, Zhenbin Zhang","doi":"10.1109/SPEC.2018.8635863","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8635863","url":null,"abstract":"We propose a novel multistep model predictive current control framework for synchronous machines. The proposed framework is based on the mathematical structure of the system model in different coordinate systems. Since the dynamics of the stator currents of the machine are independent of each other, it is possible to decouple them within the cost function in stationary coordinate frames. Based on this properties, a multistep prediction model is established. In order to obtain the optimal solution efficiently, we furthermore propose a specialized sphere decoder-based algorithm that is tailored to decoupled current control. Compared to existing approaches the proposed method does not require any matrix inversion ir decomposition for the formulation of the optimization problem. For this reason it is especially suitable for electric drive systems with large and or rank deficient system matrices. The framework is verified with the help of numerical simulations.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134113690","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8635962
J. Mishra, M. Pattnaik, S. Samanta
This paper presents power management scheme for a hybrid autonomous generation system (HAGS). This HAGS is the combination of wind, photovoltaic (PV) generation system and battery for storage purpose. The wind-PV system along with the battery are connected parallel to the dc-bus. The dc-bus voltage is controlled through a bi-directional converter. The controller has inner battery current control loop and outer voltage controller to maintain the dc bus voltage constant. This average current control method is used for power management between all sources and the dc load. The complete hybrid system is simulated in MATLAB/SIMULINK and the results represent the effective power balance for all modes of operation.
{"title":"Power Management Scheme for a Wind-Photovoltaic Hybrid Autonomous System with Battery Storage","authors":"J. Mishra, M. Pattnaik, S. Samanta","doi":"10.1109/SPEC.2018.8635962","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8635962","url":null,"abstract":"This paper presents power management scheme for a hybrid autonomous generation system (HAGS). This HAGS is the combination of wind, photovoltaic (PV) generation system and battery for storage purpose. The wind-PV system along with the battery are connected parallel to the dc-bus. The dc-bus voltage is controlled through a bi-directional converter. The controller has inner battery current control loop and outer voltage controller to maintain the dc bus voltage constant. This average current control method is used for power management between all sources and the dc load. The complete hybrid system is simulated in MATLAB/SIMULINK and the results represent the effective power balance for all modes of operation.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"162 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114787040","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8635832
L. Xiong, Zhao Xu, Liancheng Xiu
This paper deduced the model of the synchronous generator (SG) dominated power system with energy storage system (ESS) over the electromechanical time scale. Then, by adopting the method of electrical torque analysis, this paper discussed the ESS control for electromechanical oscillation mitigation and its impact on the inertia and damping characteristics of SG dominated power system. The results show that P and D controllers affect the synchronous and the damping characteristics of the SG dominated system, respectively, with power angle feedback; when the rotor speed of SG is utilized as the feedback signal, P, I and D controllers affect the damping, synchronous and inertia characteristics, respectively. In addition, the principles of different control strategies that influence the system inertia and damping characteristics are explained, rendering a ground foundation for the design of ESS control strategies to enhance the inertia and damping of SG dominated grids. The simulation results show the correctness of the conclusions derived in this paper.
{"title":"Energy Storage System Control for Electromechanical Oscillation Mitigation and Its Impact on Inertia and Damping of Power System","authors":"L. Xiong, Zhao Xu, Liancheng Xiu","doi":"10.1109/SPEC.2018.8635832","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8635832","url":null,"abstract":"This paper deduced the model of the synchronous generator (SG) dominated power system with energy storage system (ESS) over the electromechanical time scale. Then, by adopting the method of electrical torque analysis, this paper discussed the ESS control for electromechanical oscillation mitigation and its impact on the inertia and damping characteristics of SG dominated power system. The results show that P and D controllers affect the synchronous and the damping characteristics of the SG dominated system, respectively, with power angle feedback; when the rotor speed of SG is utilized as the feedback signal, P, I and D controllers affect the damping, synchronous and inertia characteristics, respectively. In addition, the principles of different control strategies that influence the system inertia and damping characteristics are explained, rendering a ground foundation for the design of ESS control strategies to enhance the inertia and damping of SG dominated grids. The simulation results show the correctness of the conclusions derived in this paper.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121786018","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8635850
Jongwan Kim, J. Lai, Xiong Liu
A 12-pulse rectifier has been widely used for harmonic mitigation in a large-scale power system. Recently, a shunt phase-shift transformer rectifier was proposed and already has been utilized in a marine transportation. For a power system equipped with multiple generators, the shunt phase-shift transformer front-end selectively eliminates 5th and 7th harmonic component with more than 75% size reduction over the conventional 12-pulse rectifier. However, a shunt phase-shift transformer rectifier requires additional source inductors to eliminate the undesired harmonics and the relationship between the source impedance and harmonic elimination has not been verified. This paper evaluates the effect of the line inductor on a harmonic cancellation performance of the shunt phase-shift transformer. An equivalent circuit analysis and a mathematical derivation of the shunt phase-shift transformer rectifier are provided and the relationship between the source impedance and harmonic cancellation is mathematically derived. The computer simulation and experimental test results from proto type hardware verify the equivalent model and the mathematical analysis.
{"title":"Analysis of Harmonic Cancellation Performance of a Shunt Phase-Shift Transformer Rectifier","authors":"Jongwan Kim, J. Lai, Xiong Liu","doi":"10.1109/SPEC.2018.8635850","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8635850","url":null,"abstract":"A 12-pulse rectifier has been widely used for harmonic mitigation in a large-scale power system. Recently, a shunt phase-shift transformer rectifier was proposed and already has been utilized in a marine transportation. For a power system equipped with multiple generators, the shunt phase-shift transformer front-end selectively eliminates 5th and 7th harmonic component with more than 75% size reduction over the conventional 12-pulse rectifier. However, a shunt phase-shift transformer rectifier requires additional source inductors to eliminate the undesired harmonics and the relationship between the source impedance and harmonic elimination has not been verified. This paper evaluates the effect of the line inductor on a harmonic cancellation performance of the shunt phase-shift transformer. An equivalent circuit analysis and a mathematical derivation of the shunt phase-shift transformer rectifier are provided and the relationship between the source impedance and harmonic cancellation is mathematically derived. The computer simulation and experimental test results from proto type hardware verify the equivalent model and the mathematical analysis.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121314648","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8636005
Fen Li, Guihua Liu, Kai Zhu, Wei Wang
Virtual synchronous generators (VSG) have the potential to solve the stability problems caused by large-scale grid-connected of distributed generation (DG). However, traditional VSG control will lead to current unbalance and power oscillations under unbalanced conditions. Aiming at these problems, an improved comprehensive control strategy of VSG is proposed based on the traditional VSG control method with voltage and current inner loops. By analyzing the relationship among unbalanced current, power oscillation and negative sequence current, the reference currents under different control targets are obtained. On this basis, the comprehensive control of power fluctuation and current quality is realized by the idea of weighted control. Moreover, the proposed control strategy does not change the voltage source properties of VSG, providing voltage and frequency support for the system, and improving the ability of VSG with unbalanced load under islanded conditions. Simulation results verify the effectiveness of the proposed control strategy.
{"title":"An Improved Control Strategy of Virtual Synchronous Generator under Unbalanced Conditions","authors":"Fen Li, Guihua Liu, Kai Zhu, Wei Wang","doi":"10.1109/SPEC.2018.8636005","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8636005","url":null,"abstract":"Virtual synchronous generators (VSG) have the potential to solve the stability problems caused by large-scale grid-connected of distributed generation (DG). However, traditional VSG control will lead to current unbalance and power oscillations under unbalanced conditions. Aiming at these problems, an improved comprehensive control strategy of VSG is proposed based on the traditional VSG control method with voltage and current inner loops. By analyzing the relationship among unbalanced current, power oscillation and negative sequence current, the reference currents under different control targets are obtained. On this basis, the comprehensive control of power fluctuation and current quality is realized by the idea of weighted control. Moreover, the proposed control strategy does not change the voltage source properties of VSG, providing voltage and frequency support for the system, and improving the ability of VSG with unbalanced load under islanded conditions. Simulation results verify the effectiveness of the proposed control strategy.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"135 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116415511","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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