Multilevel cascaded H-bridge (CHB) converter have been presented as a good solution for high-power applications. This paper has a comprehensive discussion on converter model, especially on the dead time and switches forward voltage, so as to reduce the influence of that compensation performance factor. The current error is reconstructed and feedback to increase system dynamic response. The power cells DC capacitors voltage unbalanced problem should get more serious in harmonics compensation, so this paper proposed one strategy that compensated the current. This method is suited for star configuration Static Var Generator (SVG), and implemented easily. The compensation operation not influences the cells switching frequency and could achieve excellent performance under each working conditions. Experimental results obtained from the laboratory system verify the viability and effectiveness of the 10KV energy storage system.
{"title":"Application and performance of a multilevel cascaded H-bridge converter on Static Var Generator","authors":"Yannan Yu, Jichi Yan, Hongjuan Fang, Rongfeng Yang, Yong Yu, Dianguo Xu","doi":"10.1109/IPEMC.2012.6259288","DOIUrl":"https://doi.org/10.1109/IPEMC.2012.6259288","url":null,"abstract":"Multilevel cascaded H-bridge (CHB) converter have been presented as a good solution for high-power applications. This paper has a comprehensive discussion on converter model, especially on the dead time and switches forward voltage, so as to reduce the influence of that compensation performance factor. The current error is reconstructed and feedback to increase system dynamic response. The power cells DC capacitors voltage unbalanced problem should get more serious in harmonics compensation, so this paper proposed one strategy that compensated the current. This method is suited for star configuration Static Var Generator (SVG), and implemented easily. The compensation operation not influences the cells switching frequency and could achieve excellent performance under each working conditions. Experimental results obtained from the laboratory system verify the viability and effectiveness of the 10KV energy storage system.","PeriodicalId":236136,"journal":{"name":"Proceedings of The 7th International Power Electronics and Motion Control Conference","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124058661","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 : 2012-08-06DOI: 10.1109/IPEMC.2012.6259078
Fei Zhang, Jianping Xu, Ping Yang, Tiesheng Yan
Dynamic response of the tri-state boost PFC converter operating in pseudo-continuous-conduction mode (PCCM) is significantly faster than the conventional continuous-conduction mode (CCM) and discontinuous-conduction mode (DCM) boost PFC converter. However, for universal input applications, with the root-mean-square (RMS) input line voltage in the range of 90∼265VAC, the input power factor (PF) of the tri-state boost PFC converter is relatively low when the sinusoidal reference current strategy is used. To improve the PF of the tri-state boost PFC converter over the whole input voltage range, the input current and PF expressions of the tri-state boost PFC converter are derived. Therefore, non-sinusoidal reference current control strategy is proposed to improve the PF to nearly unity in the whole input voltage range. Analytical and simulation results of the tri-state PCCM boost PFC converter are presented to verify the effectiveness of the proposed method.
{"title":"Tri-state boost PFC converter with high input power factor","authors":"Fei Zhang, Jianping Xu, Ping Yang, Tiesheng Yan","doi":"10.1109/IPEMC.2012.6259078","DOIUrl":"https://doi.org/10.1109/IPEMC.2012.6259078","url":null,"abstract":"Dynamic response of the tri-state boost PFC converter operating in pseudo-continuous-conduction mode (PCCM) is significantly faster than the conventional continuous-conduction mode (CCM) and discontinuous-conduction mode (DCM) boost PFC converter. However, for universal input applications, with the root-mean-square (RMS) input line voltage in the range of 90∼265VAC, the input power factor (PF) of the tri-state boost PFC converter is relatively low when the sinusoidal reference current strategy is used. To improve the PF of the tri-state boost PFC converter over the whole input voltage range, the input current and PF expressions of the tri-state boost PFC converter are derived. Therefore, non-sinusoidal reference current control strategy is proposed to improve the PF to nearly unity in the whole input voltage range. Analytical and simulation results of the tri-state PCCM boost PFC converter are presented to verify the effectiveness of the proposed method.","PeriodicalId":236136,"journal":{"name":"Proceedings of The 7th International Power Electronics and Motion Control Conference","volume":"158 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116396717","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 : 2012-08-06DOI: 10.1109/IPEMC.2012.6259173
Yingda Zhang, Nian Liu, Jianhua Zhang
Comprehensive utilization of electric vehicles (EVs) and renewable energy is a hot issue nowadays, but how to decide capacity ratio of EV charging infrastructures, EV batteries and wind power generators in micro-grid is still unsolved. The present paper presents a model to perform the optimum sizing of a non-grid-connected wind power system integrated with battery-exchange stations. In the model, the objective function is minimum total cost considering energy storage capacity of battery-exchange mode and EVs' energy demand, including total cost of investment, operation and energy shortage, and the constraint conditions of wind power system, recharge and discharge machines and EV batteries are considered. Differential evolution (DE) algorithm is then used to solve optimal capacity allocation. In the end, the system planning example of an area shows that the model is effective and logical.
{"title":"Optimum sizing of non-grid-connected wind power system incorporating battery-exchange stations","authors":"Yingda Zhang, Nian Liu, Jianhua Zhang","doi":"10.1109/IPEMC.2012.6259173","DOIUrl":"https://doi.org/10.1109/IPEMC.2012.6259173","url":null,"abstract":"Comprehensive utilization of electric vehicles (EVs) and renewable energy is a hot issue nowadays, but how to decide capacity ratio of EV charging infrastructures, EV batteries and wind power generators in micro-grid is still unsolved. The present paper presents a model to perform the optimum sizing of a non-grid-connected wind power system integrated with battery-exchange stations. In the model, the objective function is minimum total cost considering energy storage capacity of battery-exchange mode and EVs' energy demand, including total cost of investment, operation and energy shortage, and the constraint conditions of wind power system, recharge and discharge machines and EV batteries are considered. Differential evolution (DE) algorithm is then used to solve optimal capacity allocation. In the end, the system planning example of an area shows that the model is effective and logical.","PeriodicalId":236136,"journal":{"name":"Proceedings of The 7th International Power Electronics and Motion Control Conference","volume":"667 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133398876","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 : 2012-06-02DOI: 10.1109/IPEMC.2012.6258809
Z. Mohzani, B. Mcgrath, D. G. Holmes
One of the major benefits of a three level NPC multilevel converter is that it requires only one DC source. However, the intermediate Neutral Point (NP) voltage of the converter must be maintained midway between the two outer dc-bus voltages, to avoid semiconductor device overvoltage stress and output modulation distortion. Various approaches have been proposed to regulate the NP voltage, using active or (more recently) passive balancing strategies. Strategies have also been proposed for a multilevel converter to use feedforward techniques to adjust the modulation processes to compensate for variations in the intermediate DC link bus voltages. This paper now combines these concepts to explore how a DC link compensation strategy can enhance the natural balancing processes of a NPC multilevel converter, particularly when combined with a passive balance booster filter. The paper uses a harmonic model of the converter modulation processes to predict the natural balancing process under various operating conditions. The analysis identifies that DC link compensation provides a significant improvement in natural balancing, particularly at low modulation depths. The conclusions are validated by both simulation and experimental investigations.
{"title":"The balancing properties of DC link compensation for 3-phase Neutral Point Clamped (NPC) Converter","authors":"Z. Mohzani, B. Mcgrath, D. G. Holmes","doi":"10.1109/IPEMC.2012.6258809","DOIUrl":"https://doi.org/10.1109/IPEMC.2012.6258809","url":null,"abstract":"One of the major benefits of a three level NPC multilevel converter is that it requires only one DC source. However, the intermediate Neutral Point (NP) voltage of the converter must be maintained midway between the two outer dc-bus voltages, to avoid semiconductor device overvoltage stress and output modulation distortion. Various approaches have been proposed to regulate the NP voltage, using active or (more recently) passive balancing strategies. Strategies have also been proposed for a multilevel converter to use feedforward techniques to adjust the modulation processes to compensate for variations in the intermediate DC link bus voltages. This paper now combines these concepts to explore how a DC link compensation strategy can enhance the natural balancing processes of a NPC multilevel converter, particularly when combined with a passive balance booster filter. The paper uses a harmonic model of the converter modulation processes to predict the natural balancing process under various operating conditions. The analysis identifies that DC link compensation provides a significant improvement in natural balancing, particularly at low modulation depths. The conclusions are validated by both simulation and experimental investigations.","PeriodicalId":236136,"journal":{"name":"Proceedings of The 7th International Power Electronics and Motion Control Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114977482","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 : 2012-06-02DOI: 10.1109/IPEMC.2012.6258998
Jong-Kyu Kim, Jong-Hyun Lee, Hea-Gwang Jeong, Kyo-Beum Lee
This paper proposes a control method for grid-connected inverter systems under unbalanced and distorted grid voltage. The proposed method can reduce the power ripple caused by the unbalanced condition as well as it can compensate the low-order harmonics of the output currents due to the distortion of grid voltage. To reduce the power ripple, the proposed method replaces the four conventional PI controllers with two PR controllers in the stationary frame. PR controllers can implement the compensation of selective harmonic without excessive computational requirements; the use of these controllers simplifies the method. The simulation results agree well with the theoretical analysis.
{"title":"Improvement of grid-connected inverter systems with PR controllers under the unbalanced and distorted grid voltage","authors":"Jong-Kyu Kim, Jong-Hyun Lee, Hea-Gwang Jeong, Kyo-Beum Lee","doi":"10.1109/IPEMC.2012.6258998","DOIUrl":"https://doi.org/10.1109/IPEMC.2012.6258998","url":null,"abstract":"This paper proposes a control method for grid-connected inverter systems under unbalanced and distorted grid voltage. The proposed method can reduce the power ripple caused by the unbalanced condition as well as it can compensate the low-order harmonics of the output currents due to the distortion of grid voltage. To reduce the power ripple, the proposed method replaces the four conventional PI controllers with two PR controllers in the stationary frame. PR controllers can implement the compensation of selective harmonic without excessive computational requirements; the use of these controllers simplifies the method. The simulation results agree well with the theoretical analysis.","PeriodicalId":236136,"journal":{"name":"Proceedings of The 7th International Power Electronics and Motion Control Conference","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115273397","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 : 2012-06-02DOI: 10.1109/IPEMC.2012.6258787
Yan Liu, H. Ben, Chunpeng Li, Daqing Wang
Time delay must be inserted in the switching signals to prevent the simultaneous conduction of two switching devices in the same leg of the inverter, however, this results in a decrease of the fundamental component and an increase of the odd-order except the triple-n harmonics of the output voltage of the inverter. The distortion of output voltage further distorts the output current in turn. This paper analyses the dead-time effect in detail under Space Vector Pulse Width Modulation (SVPWM), and presents a general computation method of the harmonics of the error voltage. On this basis, a dead-time compensation scheme is proposed. MATLAB simulations and experiments are carried out based on the three-phase grid-connected inverter. The results well demonstrate the effectiveness of the proposed strategy and proved that this system has the advantage of high power factor in the AC side and little harmonics pollution to the grid.
{"title":"Research of the dead-time compensation based on the three-phase grid-connected inverter","authors":"Yan Liu, H. Ben, Chunpeng Li, Daqing Wang","doi":"10.1109/IPEMC.2012.6258787","DOIUrl":"https://doi.org/10.1109/IPEMC.2012.6258787","url":null,"abstract":"Time delay must be inserted in the switching signals to prevent the simultaneous conduction of two switching devices in the same leg of the inverter, however, this results in a decrease of the fundamental component and an increase of the odd-order except the triple-n harmonics of the output voltage of the inverter. The distortion of output voltage further distorts the output current in turn. This paper analyses the dead-time effect in detail under Space Vector Pulse Width Modulation (SVPWM), and presents a general computation method of the harmonics of the error voltage. On this basis, a dead-time compensation scheme is proposed. MATLAB simulations and experiments are carried out based on the three-phase grid-connected inverter. The results well demonstrate the effectiveness of the proposed strategy and proved that this system has the advantage of high power factor in the AC side and little harmonics pollution to the grid.","PeriodicalId":236136,"journal":{"name":"Proceedings of The 7th International Power Electronics and Motion Control Conference","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115297847","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 : 2012-06-02DOI: 10.1109/IPEMC.2012.6259355
J. Baek, W. Choi, Bohyung Cho
This paper proposes digital frequency modulation control scheme of synchronous buck converter with boundary conduction mode and digital control strategy for high efficiency over wide load range. Synchronous converter, which can reduce conduction loss through diode, is preferred in high current application. However, this is inefficient at light load condition. Therefore, to achieve the high efficiency over wide range, multi-mode strategy is proposed using digital control. Modes are classified four types, from continuous conduction mode to boundary conduction mode, discontinuous conduction mode and pulse skipping mode as load decreases. The proposed method is implemented by TI's TMS320F28335 DSP chip. For the experimental verification, a 100W synchronous buck converter with 38V input and 20V/5A output is implemented.
{"title":"Digital control of synchronous buck converter with multi-mode for wide load range","authors":"J. Baek, W. Choi, Bohyung Cho","doi":"10.1109/IPEMC.2012.6259355","DOIUrl":"https://doi.org/10.1109/IPEMC.2012.6259355","url":null,"abstract":"This paper proposes digital frequency modulation control scheme of synchronous buck converter with boundary conduction mode and digital control strategy for high efficiency over wide load range. Synchronous converter, which can reduce conduction loss through diode, is preferred in high current application. However, this is inefficient at light load condition. Therefore, to achieve the high efficiency over wide range, multi-mode strategy is proposed using digital control. Modes are classified four types, from continuous conduction mode to boundary conduction mode, discontinuous conduction mode and pulse skipping mode as load decreases. The proposed method is implemented by TI's TMS320F28335 DSP chip. For the experimental verification, a 100W synchronous buck converter with 38V input and 20V/5A output is implemented.","PeriodicalId":236136,"journal":{"name":"Proceedings of The 7th International Power Electronics and Motion Control Conference","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115831721","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 : 2012-06-02DOI: 10.1109/IPEMC.2012.6258972
Haihong Qin, Bin Zhao, W. Xu, Jiaopu Wen, Yangguang Yan
Recently, the SiC device technology is rapidly progressed. And SiC device is known by its outstanding property, such as lower on-resistance and short switching time. Especially, the SiC MOSFETs are finding their niche in the kilovolt range, which is currently dominated by Si IGBTs. However, the performance improvement of a power conversion circuit has not been clearly shown. A two-transistor converter will be built and the power losses of SiC and Si MOSFET based converter for 50 kHz switching frequency will be evaluated and compared. And higher switching frequency operation of SiC MOSFET based converter will also be observed. These questions will be explored for the class of high-frequency, hard-switched converters with input voltage up to about 600VDC and power throughput in the kilowatt range. The isolated gate driver of the SiC MOSFET is shown.
{"title":"Evaluation of performance improvement of Silicon Carbide MOSFETs based DC-DC converter","authors":"Haihong Qin, Bin Zhao, W. Xu, Jiaopu Wen, Yangguang Yan","doi":"10.1109/IPEMC.2012.6258972","DOIUrl":"https://doi.org/10.1109/IPEMC.2012.6258972","url":null,"abstract":"Recently, the SiC device technology is rapidly progressed. And SiC device is known by its outstanding property, such as lower on-resistance and short switching time. Especially, the SiC MOSFETs are finding their niche in the kilovolt range, which is currently dominated by Si IGBTs. However, the performance improvement of a power conversion circuit has not been clearly shown. A two-transistor converter will be built and the power losses of SiC and Si MOSFET based converter for 50 kHz switching frequency will be evaluated and compared. And higher switching frequency operation of SiC MOSFET based converter will also be observed. These questions will be explored for the class of high-frequency, hard-switched converters with input voltage up to about 600VDC and power throughput in the kilowatt range. The isolated gate driver of the SiC MOSFET is shown.","PeriodicalId":236136,"journal":{"name":"Proceedings of The 7th International Power Electronics and Motion Control Conference","volume":"85 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120863720","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 : 2012-06-02DOI: 10.1109/IPEMC.2012.6258991
Siyang Zhao, Junming Zhang, Yang Shi
Flyback converter is widely adopted in low power application. In order to get a high efficiency, the Flyback transformer should be well coupled with interleaved structure, which makes the transformer construction labor intensive. Usually the triple insulation wire is used to meet the safety regulation, which further increases the cost of the transformer. The simple transformer structure by separating the primary winding and secondary side winding with a chamber bobbin can greatly decrease the effort of the transformer construction, increase the productivity and achieve good isolation using cheap magnet wire. However, the high leakage inductance due to simple structure will deteriorate the efficiency. In this paper, the Flyback topology with a lossless snubber for the simple transformer structure is analyzed. The optimal parameters design considerations with off-time control are also presented. Finally, a 6V/900mA prototype with simple transformer and bipolar transistor are built, and the experimental results verify the theoretical analysis and the design methodology.
{"title":"A low cost low power Flyback converter with a simple transformer","authors":"Siyang Zhao, Junming Zhang, Yang Shi","doi":"10.1109/IPEMC.2012.6258991","DOIUrl":"https://doi.org/10.1109/IPEMC.2012.6258991","url":null,"abstract":"Flyback converter is widely adopted in low power application. In order to get a high efficiency, the Flyback transformer should be well coupled with interleaved structure, which makes the transformer construction labor intensive. Usually the triple insulation wire is used to meet the safety regulation, which further increases the cost of the transformer. The simple transformer structure by separating the primary winding and secondary side winding with a chamber bobbin can greatly decrease the effort of the transformer construction, increase the productivity and achieve good isolation using cheap magnet wire. However, the high leakage inductance due to simple structure will deteriorate the efficiency. In this paper, the Flyback topology with a lossless snubber for the simple transformer structure is analyzed. The optimal parameters design considerations with off-time control are also presented. Finally, a 6V/900mA prototype with simple transformer and bipolar transistor are built, and the experimental results verify the theoretical analysis and the design methodology.","PeriodicalId":236136,"journal":{"name":"Proceedings of The 7th International Power Electronics and Motion Control Conference","volume":"62 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120933288","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 : 2012-06-02DOI: 10.1109/IPEMC.2012.6259198
M. Zulqarnain, David Xu, B. Yuwen
Growing trend of multi mega watt turbine installations is one of the reason behind the increasing popularity of modular converter technology. This paper focuses on direct driven synchronous generator (SG) based variable speed wind turbine (VSWT) that are connected to power grid via modular converter units. Compared to medium voltage, full rating power converter, multi modular design exhibit better harmonic performance and is also superior in terms of both system reliability and efficiency. Research previously conducted on modular converters focused on controller design that either had a centralized structure or had master slave configuration [1]. Designing autonomous/ distributed controllers for modular converter system is objective of this research. Besides equal power sharing among operational units, the other main challenge in design of distributed controller was to ensure, under all conditions, an interleaved operation of the parallel modules. In interleaving, parallel power stages share same switching frequency but have carrier phases displaced uniformly throughout the switching period. With interleaving, ripple in the output current is significantly reduced which enables use of smaller sized filter components [2]. An autonomous controller will greatly improve system's reliability and redundancy. In order to test the designed controller, simulation of a 4MW, direct driven synchronous generator (SG) based variable speed wind energy conversion system (WECS) was carried out in Simulink®. The system is connected to grid via two parallel operating converter (rectifier/inverter) units and was examined under various test conditions. Simulation results show good performance of the designed controller.
{"title":"Multi modular converters with automatic interleaving for synchronous generator based wind energy system","authors":"M. Zulqarnain, David Xu, B. Yuwen","doi":"10.1109/IPEMC.2012.6259198","DOIUrl":"https://doi.org/10.1109/IPEMC.2012.6259198","url":null,"abstract":"Growing trend of multi mega watt turbine installations is one of the reason behind the increasing popularity of modular converter technology. This paper focuses on direct driven synchronous generator (SG) based variable speed wind turbine (VSWT) that are connected to power grid via modular converter units. Compared to medium voltage, full rating power converter, multi modular design exhibit better harmonic performance and is also superior in terms of both system reliability and efficiency. Research previously conducted on modular converters focused on controller design that either had a centralized structure or had master slave configuration [1]. Designing autonomous/ distributed controllers for modular converter system is objective of this research. Besides equal power sharing among operational units, the other main challenge in design of distributed controller was to ensure, under all conditions, an interleaved operation of the parallel modules. In interleaving, parallel power stages share same switching frequency but have carrier phases displaced uniformly throughout the switching period. With interleaving, ripple in the output current is significantly reduced which enables use of smaller sized filter components [2]. An autonomous controller will greatly improve system's reliability and redundancy. In order to test the designed controller, simulation of a 4MW, direct driven synchronous generator (SG) based variable speed wind energy conversion system (WECS) was carried out in Simulink®. The system is connected to grid via two parallel operating converter (rectifier/inverter) units and was examined under various test conditions. Simulation results show good performance of the designed controller.","PeriodicalId":236136,"journal":{"name":"Proceedings of The 7th International Power Electronics and Motion Control Conference","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127172834","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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