D-STATCOM参数优化的小水电电能质量分析  

Analysis of power quality of small hydropower based on D-STATCOM control parameter optimization

作　　者：闫群民[1,2] 张凤鸽 马瑞卿[1] 马永翔[2] YAN Qunmin;ZHANG Fengge;MA Ruiqing;MA Yongxiang(School of Automation,Northwestern Polytechnical University,Xi'an 710072,China;School of Electrical Engineering,Shanxi University of Technology,Hanzhong 723000,Shaanxi China;School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]西北工业大学自动化学院,陕西西安710072 [2]陕西理工大学电气工程学院,陕西汉中723000 [3]华中科技大学电气与电子工程学院,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2020年第9期64-69,共6页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家重点研发计划资助项目(2016YFB0900600);国网陕西省电力公司科技项目(5226AK1900CY)。

摘　　要：为了对径流式小水电出力不确定及其配电网负荷变化等情形带来的电能质量问题进行综合治理,分析了小水电接入配电网的运行特性,提出了一种基于电感-电容-电感(LCL)型静止同步补偿装置(D-STATCOM)的准比例谐振(QPR)分相控制策略.利用频率特性分析证明了QPR相对比例积分(PI)、比例谐振(PR)控制方法可以实现对各个频段的无静差调节,研究了QPR控制器参数对系统稳定性的影响,优化设计了控制器谐振带系数、比例系数和谐振增益系数等参数.最后,在Matlab/Simulink建立了含有小水电并网系统的仿真模型,同时将本系统与传统并补装置下的补偿电流谐波进行分析.结果表明:所提控制策略和参数优化不仅能够快速有效地抑制电压波动,总畸变抑制率为1.11%,而且能降低并联补偿设备向系统注入的谐波,动态地保证配电网的电能质量,能较好地适应小水电的运行特性.In order to comprehensively manage the power quality problems caused by the uncertainties of the output of small hydropower and the changes in the load on the distribution network,a quasi-PR(QPR)phase-splitting control strategy was proposed based on LCL static reactive power compensation device(D-STATCOM).The frequency characteristics analysis proved that the quasi-PR relative to the proportional integral(PI)and proportion resonant(PR)control methods can achieve non-error adjustment in various frequency bands.And the controller’s resonance band coefficient,proportional coefficient,and resonance gain coefficient were optimized.Finally,a simulation model containing a small hydropower grid-connected system was established in Matlab/Simulink.The simulation results show that the proposed control strategy and parameter optimization can not only effectively suppress voltage fluctuations,but also reduce the harmonics injected into the system by the parallel compensation equipment.

关 键 词：配电网 电能质量 静止同步补偿装置 QPR控制 LCL滤波器 动态补偿 

分 类 号：TM714.2[电气工程—电力系统及自动化]