电网不平衡故障下电力电子变压器控制策略

doi:10.3969/j.issn.1000－7229.2016.07.012

电力建设 ›› 2016, Vol. 37 ›› Issue (7): 84-90.doi: 10.3969/j.issn.1000－7229.2016.07.012

电网不平衡故障下电力电子变压器控制策略

冯宇鹏1，吴金龙1，王先为1，刘欣和1，牛化鹏1，姚为正2

1.西安许继电力电子技术有限公司，西安市 710075；2.许继集团有限公司，河南省许昌市 461000

出版日期:2016-07-01
作者简介:冯宇鹏（1987），男，硕士，工程师，主要研究方向为高压STATCOM、电力电子变压器；吴金龙（1981），男，工学硕士，高级工程师，主要研究方向为柔性直流输电系统分析与设计、控制策略设计；王先为（1985），男，博士，工程师，研究方向为柔性交直流输电技术；刘欣和（1985），男，硕士，工程师，主要研究方向为柔性直流输电技术; 牛化鹏（1982），男，硕士，高级工程师，研究方向为地铁回馈，电力电子变压器；姚为正（1967），男，博士，教授级高工，研究方向为电力电子及其在电力系统中的应用。
基金资助:
国家电网公司科技项目（SGRI-DL-71-15-005）

Control Strategy of Power Electronic Transformer under Unbalanced Grid Fault

FENG Yupeng1，WU Jinlong1，WANG Xianwei1，LIU Xinhe1，NIU Huapeng1，YAO Weizheng2

1. Xi'an XJ Power Electronics Technology Corporation, Xi'an 710075, China; 2. Xuji Group Corporation, Xuchang 461000, Henan Province, China

Online:2016-07-01

摘要/Abstract

摘要： 针对电网不平衡故障下电力电子变压器（power electronic transformer, PET）高压级的相间均压问题和对电网电压的支撑问题，首先对负序电流注入法进行了研究，推导了需注入的负序电流幅值和相位，分析了有功电流和负序电流对电网公共连接点（point of common coupling，PCC）电压的影响，然后提出了一种新的适用于PET相间均压的零序电压注入法。仿真结果表明，电网故障时，PET仅传输有功功率，会降低PCC点正序电压，输出无功后可有效支撑电网电压。负序电流注入法和零序电压注入法均可实现高压级相间均压，但负序电流注入法需高压级具备更大的电流应力，且抬升了电网负序电压，而采用零序电压注入法时，高压级三相电流对称，对电网负序电压无影响。PET隔离级所有双有源桥（dual active bridge , DAB）传输功率均衡，低压级输出电压和功率恒定，不受电网故障的影响。

关键词: 电网不平衡故障, 负序电流, 零序电压, 直流电压平衡控制, 功率均衡控制

Abstract: For the DC voltage balance control problem among phases of power electronic transformer （PET） and grid voltage support problem under unbalanced grid fault, this paper first studies the negative sequence current injection method, derives the current amplitude and phase of the negative sequence, and analyzes the influences of active current and negative sequence current on the point of common coupling （PCC） voltage. Then, this paper proposes a new zero sequence voltage injection method suitable for PET. The simulation results show that, when the grid fault occurs, if PET only transmits active power, the positive sequence voltage of PCC will be reduced, and the reactive power can effectively support the grid voltage. Both the negative sequence current injection method and the zero sequence voltage injection method can make the DC voltage balance among phases of high voltage stage, but the negative sequence current injection method needs greater current stress, and the negative sequence gird voltage is increased. When the zero sequence voltage injection method is used, the three phase current of high voltage stage is symmetrical, and there is no influence on the negative sequence voltage. The active power of all PET isolation stage DAB （dual active bridge） are equal, and the output voltage and power of low voltage stage are constant, which are not influenced by the grid fault.

Key words: unbalanced grid fault, negative sequence current, zero sequence voltage, DC voltage balance control, power balance control

中图分类号:

TM 761

冯宇鹏，吴金龙，王先为，刘欣和，牛化鹏，姚为正. 电网不平衡故障下电力电子变压器控制策略[J]. 电力建设, 2016, 37(7): 84-90.

FENG Yupeng，WU Jinlong，WANG Xianwei，LIU Xinhe，NIU Huapeng，YAO Weizheng. Control Strategy of Power Electronic Transformer under Unbalanced Grid Fault [J]. Electric Power Construction, 2016, 37(7): 84-90.

参考文献

［1］张弛，江道灼，叶李心，等. 一种适用于直流配电网的双向稳压型电压平衡器［J］. 电力建设, 2013,34 （10）: 53-59. ZHANG Chi，JIANG Daozhuo，YE Lixin, et al. A bi-directional voltage regulating balancer for DC power distribution network［J］. Electric Power Construction, 2013,34 （10）: 53-59. ［2］陈亚爱, 陈鹏, 周京华. 电力电子变压器研究现状及工程应用［J］. 电气应用, 2014, 33（23）:102-106. CHEN Yaai, CHEN Peng, ZHOU Jinghua. Research status and engineering application of Power Electronic Transformer ［J］ . Electrical Application, 2014, 33（23）:102-106. ［3］陈启超, 纪延超, 潘延林, 等. 配电系统电力电子变压器拓扑结构综述［J］. 电工电能新技术, 2015,34（3）:41-48. CHEN Qichao, JI Yanchao, PAN Yanlin, et al. Review of power electronic transformer topology structure on distribution system［J］. Advanced Technology of Electrical Engineering and Energy, 2015,34（3）:41-48. ［4］陈启超, 王建赜, 纪延超. 基于LLC谐振变换器的电力电子变压器［J］. 电力系统自动化, 2014,38（3）:41-46. CHEN Qichao, WANG Jianyi, JI Yanchao. Power electronic transformer based on the llc resonant converter［J］. Automation of Electric Power Systems, 2014.38（3）:41-46. ［5］葛俊杰, 赵争鸣. 级联型电压自平衡固态变压器［J］. 清华大学学报（自然科学版）, 2013,53（4）:459-464. GE Junjie, ZHAO Zhengming. Cascaded voltage self-balancing solid state transformer［J］. Journal of Tsinghua University（Science and Technology）, 2013,53（4）:459-464. ［6］凌晨, 葛宝明, 毕大强. 配电网中的电力电子变压器研究［J］. 电力系统保护与控制，2012,40（2）:34-39. LING Chen,GE Baoming,BI Daqiang. A power electronic transformer applied to distribution system［J］. Power System Protection and Control，2012，40（2）:34-39. ［7］刘海波, 毛承雄, 陆继明, 等. 配电系统电子电力变压器非线性控制［J］. 中国电机工程学报, 2009,29（27）:1-8. LIU Haibo, MAO Chengxiong, LU Jiming, et al. Nonlinear control of electronic power transformer for distribution systems［J］. Proceedings of the CSEE, 2009,29（27）:1-8. ［8］王丹, 毛承雄, 陆继明. 自平衡电子电力变压器［J］. 中国电机工程学报, 2007,27（6）:77-83. WANG Dan, MAO Chengxiong, LU Jiming. Auto balancing electronic power transformer［J］. Proceedings of the CSEE, 2007,27（6）.77-83. ［9］ LEE C T, WANG B S, CHEN S W, et al. Average power balancing control of a STATCOM based on the cascaded H-bridge PWM converter with star configuration［J］. IEEE Transactions on Industry Applications, 2013, 50（6）:970-977. ［10］赵波, 郭剑波, 周飞. 链式STATCOM相间直流电压平衡控制策略［J］. 中国电机工程学报, 2012,32（34）:36-41. ZHAO Bo, GUO Jianbo, ZHOU Fei. DC voltage balance control strategy among phases for cascaded STATCOM［J］. Proceedings of the CSEE. 2012, 32（34）:36-41. ［11］ HATANO N, ISE T. A configuration and control method of cascade H-bridge STATCOM［C］//Power and Energy Society General Meeting-Conversion and Delivery of Electrical Energy in the 21st Century. Pittsburgh, PA: IEEE, 2008:1-8. ［12］ BETZ R E, SUMMERS T, FURNEY T. Symmetry compensation using a H-bridge multilevel STATCOM with zero sequence injection［C］// Power and Energy Society General Meeting-Conversion and Delivery of Electrical Energy in the 21st Century. Pittsburgh, PA: IEEE, 2006:1724-1731. ［13］ SONG Q, LIU W. Control of a cascade STATCOM with star configuration under unbalanced conditions［J］. IEEE Transactions on Power Electronics, 2009,24（1）:45-58. ［14］ TIAN Jie, MAO Chengxiong, WANG Dan, et al. Analysis and control of electronic power transformer with star-configuration under unbalanced conditions［J］. IET Electric Power Applications, 2015, 9（5）:358-369. ［15］ RODRIGUEZ P, POU J, BERGAS J, et al. Decoupled double synchronous reference frame pll for power converters control［J］. IEEE Transactions on Power Electronics, 2007, 22（3）:584-592. ［16］ DE DONCKER R W, DIVAN D M, KHERALUWALA M H. A three-phase soft-switched high power density DC/DC converter for high power applications［C］// Industry Applications Society Annual Meeting. Pittsburgh, PA :IEEE,1988, 1:796-805.

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电网不平衡故障下电力电子变压器控制策略

Control Strategy of Power Electronic Transformer under Unbalanced Grid Fault

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