非对称运行状态下换流器改进开关函数模型

发布时间：2018-04-28 03:20

本文选题：非对称运行 + 换相过程　；参考：《电网技术》2016年05期

【摘要】：传统的换流器开关函数模型应用于非对称运行状态分析时,精度显著降低。详细分析了三相非对称运行状态下换流器的换相过程,并着重考虑了直流侧2次谐波电流对换相持续时间的影响,提出了考虑2次谐波电流影响的换相角计算方法。基于分析建立了考虑阀导通偏移和换相角不等的换流器改进开关函数模型,并通过忽略非必要次谐波简化了模型的计算过程。在Matlab中编程实现了提出的开关函数模型,并采用PSCAD中搭建的Cigre-Benchmark直流标准模型的仿真结果进行检验。分别在逆变侧和整流侧设置换流母线三相不对称,通过对比直流侧直流电压、换流母线三相注入电流及注入功率,验证了提出模型的有效性。
[Abstract]:When the traditional switching function model of converter is applied to asymmetric operation state analysis, the precision is reduced significantly. The commutation process of the converter under the condition of three-phase asymmetrical operation is analyzed in detail, and the effect of the second harmonic current on the duration of commutation is considered in detail, and the calculation method of the commutation angle considering the influence of the second harmonic current is put forward. Based on the analysis, an improved switching function model of converter considering valve conduction offset and phase change angle is established, and the calculation process of the model is simplified by neglecting non-necessary subharmonics. The switch function model is realized by programming in Matlab, and the simulation results of Cigre-Benchmark DC standard model built in PSCAD are used to verify the model. The inverter side and the rectifier side are respectively set up commutation busbar three-phase asymmetry, by comparing DC side DC voltage, commutation bus three-phase injection current and injection power, the validity of the proposed model is verified by comparing the DC side DC voltage, commutating busbar three-phase injection current and injection power.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);
【基金】：教育部新世纪优秀人才支持计划项目(NCET-12-0846) 高等学校学科创新引智计划(“111”计划)(B08013) 国网科技部重点科技项目(适应智能化发展需求的电网安全和充裕控制技术研究与应用)~~
【分类号】：TM721.1

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