邢法财;徐政;王世佳;张哲任;张锋;

• 1:浙江大学电气工程学院
• 2:国网新疆电力有限公司

摘要(Abstract)：

为探究新能源并网引起的振荡问题,从定性和定量两方面对并网换流器的交流侧扰动特性进行了研究。首先,从频率变换的角度出发,定性分析了交流侧扰动在换流器内部的传递情况;并借助于时空相矢图特别解释了二倍频互补频率扰动分量的产生机理。然后,对换流器内部各扰动分量间的定量关系进行了推导,并推得换流器的端口导纳、转移导纳及频率耦合效应矩阵,其中特别考虑了锁相环的影响。最后,通过时域仿真对上述推导进行了验证,并分析了换流器的负电阻效应。研究表明,锁相环的输出相位扰动导致了dq轴扰动分量的不对称,并进而引起了扰动分量间的频率耦合效应;另外,当网络电阻不足以抵消换流器的负电阻时,电力网络存在谐振不稳定的风险。

关键词(KeyWords)： 三相换流器;扰动特性;锁相环;二倍频互补频率;谐振不稳定

Abstract:

Keywords:

基金项目(Foundation): 国家电网公司科技项目(复杂电网下新能源发电基地次/超同步振荡评估、抑制与防控技术研究(SGXJ0000TKJS1800238))~~

作者(Author): 邢法财;徐政;王世佳;张哲任;张锋;

Email:

DOI: 10.13335/j.1000-3673.pst.2019.0028

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