摘要
非隔离型光伏并网系统共模电流较大,其大小受控制方法的直接影响。首先阐述系统共模电流产生机理,然后在分析传统直接功率控制原理的基础上提出一种基于新型开关表和性能指标评估函数的模型预测直接功率控制方法,该方法通过权衡各个控制性能指标之间耦合关系实现最优电压矢量的选择。对提出的方法进行了仿真实验研究,并与传统直接功率控制方法进行了详细对比分析,结果表明提出的方法不仅可以有效抑制系统共模电流,同时能够降低输出功率脉动,验证了该方法的可行性和有效性。
The common mode current in non-isolated photovoltaic(PV)grid-connected systems is large,whichis mainly affected by the control method. The generation mechanism of system common mode current and thetraditional direct power control(DPC)were analyzed,and a novel model predictive direct power control(MPDPC)strategy was proposed based on the new switching table and performance evaluation function. The MPDPC couldselect the optimal voltage vector by weighting the coupling between the various control performance index. Simulationexperiments of the proposed MPDPC were carried out and the comparison of MPDTC and DPC were conducted. Theresults show that the proposed MPDPC can be able to suppress common mode current and reduce the output powerripples,which verifies the feasibility and validity of the proposed MPDPC.
出处
《电气传动》
北大核心
2017年第6期23-27,35,共6页
Electric Drive
基金
河北省高等学校自然科学青年基金项目(QN2016193
QN2014148)
河北省高等学校创新团队领军人才培育计划(LJRC003)
关键词
非隔离型光伏并网逆变器
共模电流
模型预测直接功率控制
性能指标评估函数
non-isolated PV grid-connected inverters
common mode current
model predictive direct power control(MPDPC)
performance evaluation function
