混合型有源滤波器接入LCC-HVDC后的谐振分析及抑制方法  

Resonance Analysis and Suppression Method of Hybrid Active Power Filter Connected to LCC-HVDC

作　　者：李双健 贾秀芳 LI Shuangjian;JIA Xiufang(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京102206

出　　处：《高电压技术》2021年第7期2480-2488,共9页High Voltage Engineering

摘　　要：混合型有源滤波器(HAPF)为LCC-HVDC系统的交流侧滤波提供了一种新型的主动滤波方案,但HAPF接入LCC-HVDC后的并网系统存在较大的谐振风险。针对上述问题,首先建立了HAPF的等效阻抗模型,利用阻抗分析法定量分析了HAPF并网系统稳定性与控制延时的大小关系,指出系统稳定性会随着控制延时的增大而降低。在此基础上,提出了基于HAPF离散状态空间模型的谐振抑制方法,通过补偿控制延时来实现谐振抑制,同时采用状态观测器来预测状态变量减少了传感器的数量。最后,利用PSCAD/EMTDC完成仿真验证。结果表明,HAPF具有良好的滤波效果,所提谐振抑制方法能够提高HAPF并网系统的稳定性。Hybrid active power filter(HAPF)provides a new type of active filtering scheme for the AC side filtering of an LCC-HVDC system,but there is a greater risk of resonance in the grid-connected system after the HAPF is connected to the LCC-HVDC.To solve the above problems,the equivalent impedance model of HAPF is established.Then the impedance analysis method is used to quantitatively analyze the relationship between the stability of the HAPF grid-connected system and the control delay,and it is pointed out that the system stability will decrease as the control delay increases.On this basis,a resonance suppression method based on the HAPF discrete state space model is proposed,which realizes resonance suppression by compensating for the control delay,and the state observer is used to predict the state variable to reduce the number of sensors.Finally,the simulation verification is performed on the PSCAD/EMTDC.The results show that the HAPF has a good filtering effect,and the proposed resonance suppression method can be adopted to improve the stability of the HAPF grid-connected system.

关 键 词：电网换相换流器高压直流输电 混合型有源滤波器 控制延时 离散状态空间模型 状态观测器 谐振 

分 类 号：TM721.1[电气工程—电力系统及自动化]