Frequency Support Control Method for Interconnected Power Systems Using VSC-MTDC
Frequency Support Control Method for Interconnected Power Systems Using VSC-MTDC
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DOI：
10.1109/tpwrs.2020.3026035
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发表时间：
2020-09
影响因子：
6.6
通讯作者：
Zhou Li;Zi-ang Wei;Ruopei Zhan;Yazhou Li;Yi Tang;Xiao-Ping Zhang
中科院分区：
文献类型：
--
作者：
Zhou Li;Zi-ang Wei;Ruopei Zhan;Yazhou Li;Yi Tang;Xiao-Ping Zhang
利用VSC-MTDC为互联电力系统提供频率支持是一种有吸引力的解决方案。针对传统方法无法将需要有功功率支持的交流系统（RAPS系统）的功率不足或剩余吸收到VSC-MTDC中，以及提供有功功率支持的交流系统（PAPS系统）无法灵活有效地进行功率平衡的缺点，提出了一种基于VSC-MTDC的互联电力系统频率支持控制方法。提出的频率支持控制方法的主要原理是首先通过对RAPS换流器提出的交流松弛母线模式控制，使RAPS系统的有功缺额或富余额完全自然地吸收到直流电网中;此外，进一步提出平滑切换控制和功率限制控制，实现平滑安全的缺额或富余额吸收。其次，根据所提出的灵活的PAPS系统匹配策略，选择一个或多个合适的PAPS系统具有足够的容量，通过相应的PAPS变换器使用有源平衡功率控制来有效地和准确地平衡不平衡功率。理论分析和PSCAD/EMTDC仿真结果验证了所提频率支持控制方法的有效性、灵活性和通用性。
Using VSC-MTDC to provide frequency support for interconnected power systems is an attractive solution. Considering the disadvantages of traditional methods in power shortage or surplus absorption into the VSC-MTDC from AC systems requiring active power support (RAPS system) as well as flexible and effective power balance in AC systems providing active power support (PAPS system), this paper proposes a novel frequency support control method for interconnected power systems using VSC-MTDC. The main principle of the proposed frequency support control method is firstly to make the active power shortage or surplus of the RAPS system be fully and naturally absorbed into the DC grid with the AC slack bus mode control proposed for RAPS converters; in addition, the smooth switching control and the power limiting control are further proposed to realize smooth and safe power shortage or surplus absorption. Secondly, according to the proposed flexible PAPS systems matching strategy, one or more appropriate PAPS systems with adequate capacity are selected to effectively and accurately balance the unbalanced power via the corresponding PAPS converters using the active balancing power control. The theoretical analysis and simulation results using PSCAD/EMTDC have verified the validity, flexibility and universality of the proposed frequency support control method.