考虑延时补偿的配电网柔直网侧谐波电流抑制策略Harmonic Current Suppression Strategy of MMC-MVDC Considering Delay Compensation
朱海勇,吴小丹,董云龙,吴永华,刘鹏,裘鹏,戚宣威
ZHU Haiyong,WU Xiaodan,DONG Yunlong,WU Yonghua,LIU Peng,QIU Peng,QI Xuanwei
摘要(Abstract):
在配电网系统中普遍存在非线性负载引起的谐波电流污染现象,通过适当控制策略的优化,基于MMC-MVDC(模块化多电平换流器中压直流)的配电网柔性直流输电系统可以实现网侧谐波电流的有效抑制。在柔直内环PI控制器的基础上,基于比例谐振控制器实现谐波电流的无静差跟踪,提出一种配电网柔直网侧电流闭环控制策略,无需谐波分离算法,采用基波和谐波电流独立、控制链路延时补偿的双序闭环控制结构,可同时实现多端系统互联、潮流优化以及谐波治理功能。利用MATLAB分析了功率控制环和谐波抑制环幅频特性,证明该控制策略具有良好的稳定性。方案应用到三端配电网柔直系统,RTDS试验结果验证了控制策略的正确性和有效性。
Harmonic current pollutions caused by nonlinear loads is a universal phenomenon in distribution systems. The medium voltage direct current distribution system based on a modular multilevel converter(MMC-MVDC) can effectively suppress the harmonic current on the network side by optimizing the appropriate control strategy. In this paper, based on the traditional inner loop PI controller, the harmonic current tracking without static difference is realized based on the proportional resonance controller, and a networkside current closed-loop control strategy of the MMC-MVDC distribution system is proposed, which dispenses with harmonic separation algorithm and employs a dual closed-loop control structure with independent fundamental and harmonic current and the control link delay compensated. It can realize multi-terminal system interconnection, power flow optimization and harmonic control at the same time. Based on MATLAB, the amplitude-frequency characteristics of the power control loop and harmonic suppression loop are analyzed, and the excellent stability of the system is verified. The scheme is applied to the three-terminal MMC-MVDC distribution system, and the RTDS test results verify the correctness and effectiveness of the control strategy.
关键词(KeyWords):
MMC-MVDC;谐波抑制;谐振控制器;延时补偿
MMC-MVDC;harmonic suppression;resonance controller;time delay compensation
基金项目(Foundation): 国网浙江省电力有限公司科技项目(2021ZK07)
作者(Author):
朱海勇,吴小丹,董云龙,吴永华,刘鹏,裘鹏,戚宣威
ZHU Haiyong,WU Xiaodan,DONG Yunlong,WU Yonghua,LIU Peng,QIU Peng,QI Xuanwei
DOI: 10.19585/j.zjdl.202111012
参考文献(References):
- [1]李钢,田杰,卢宇,等.无联结变压器MMC-MVDC配电网零序电压抑制策略[J].电力建设,2018,39(7):57-63.
- [2]江道灼,郑欢.直流配电网研究现状与展望[J].电力系统自动化,2012,36(8):98-104.
- [3]赵成勇,宋冰倩,许建中.柔性直流电网故障电流主动控制典型方案综述[J].电力系统自动化,2020,44(5):3-13.
- [4]付强,杜文娟,王海风.基于虚拟阻尼指标的柔性直流电网小信号稳定性分析[J].电力系统自动化,2020,44(11):111-120.
- [5]易皓,卓放,翟灏.基于矢量谐振调节器的有源电力滤波器网侧电流检测控制方法研究[J].电工技术学报,2015,30(7):72-79.
- [6]王坚锋,胥芳,潘国兵,等.一种新型有源滤波器网侧电流双闭环控制方法[J].电力电子技术,2020,54(5):43-46.
- [7]韩民晓,谢文强,王超.直流配电网中电能质量问题初探[J].中国标准化,2019(5):125-131.
- [8]杨峰.柔性直流配网不平衡控制研究[D].杭州:浙江大学,2016.
- [9]樊道庆,郭贤朝,刘静佳.模块化多电平的谐波补偿控制策略[J].自动化与仪表,2018,33(2):73-76.
- [10]郭贤珊,刘泽洪,李云丰,等.柔性直流输电系统高频振荡特性分析及抑制策略研究[J].中国电机工程学报,2020,40(1):19-29.
- [11]李岩,邹常跃,饶宏,等.柔性直流与极端交流系统间的谐波谐振[J].中国电机工程学报,2018,38(增刊1):19-23.
- [12]郭春义,彭意,徐李清,等.考虑延时影响的MMC-HVDC系统高频振荡机理分析[J].电力系统自动化,2020,44(22):119-126.
- [13]姚广增,彭克,李海荣,等.柔性直流配电系统高频振荡降阶模型与机理分析[J].电力系统自动化,2020,44(20):29-36.
- [14]吴桂良.基于模块化多电平换流器的柔性直流输电系统研究[D].成都:西南交通大学,2015.
- [15]吴小丹,王鹏飞,曹冬明.星形链式STATCOM直流侧输入阻抗及交直流功率耦合关系分析[J].电力自动化设备,2021,41(4):70-76.
- [16]年珩,朱茂玮,徐韵扬,等.基于谐波传递矩阵的MMC换流站频率耦合特性建模与分析[J].电力系统自动化,2020,44(6):75-83.
- [17]年珩,朱茂玮,徐韵扬,等.双闭环定交流电压控制下MMC换流站阻抗建模及稳定性分析[J].电力系统自动化,2020,44(4):81-90.
- [18]HARNEFORS L,YEPES A G,VIDAL A,et a1.Passivitybased stabilization of resonant current controllers with consideration of time delay[J].IEEE Transactions on Power Electronics,2014,29(12):6260-6263.
- [19]FRANKLIN G F,POWELL J D,EMAMI-NAEINI A.李中华等译.自动控制原理与设计[M].北京:电子工业出版社,2014.
- [20]董云龙,凌为家,田杰,等.舟山多端柔性直流输电控制保护系统[J].电力自动化设备,2016,36(7):169-175.
- [21]高宇膺,杨浩,朱海勇,等.柔性直流配电网的RTDS仿真试验研究[J].浙江电力,2021,40(3):1-7.