A Coordination Control Strategy of Voltage-Source-Converter-Based MTDC for Offshore Wind Farms
A Coordination Control Strategy of Voltage-Source-Converter-Based MTDC for Offshore Wind Farms
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DOI：
10.1109/ias.2014.6978377
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发表时间：
2014-12
影响因子：
4.4
通讯作者：
Jingguo Ren;Kejun Li;Lijun Sun;Jianguo Zhao;Yongliang Liang;Weijen Lee;Zhaohao Ding;Ying Sun
中科院分区：
文献类型：
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作者：
Jingguo Ren;Kejun Li;Lijun Sun;Jianguo Zhao;Yongliang Liang;Weijen Lee;Zhaohao Ding;Ying Sun
与其他主要电气设备一样，直流网络的可靠性和稳定性成为使用基于电压源换流器的多端直流（VSC-MTDC）系统进行海上风电并网时最重要的问题。结合电压裕度控制和电压下垂控制的优点，提出了一种主辅协调控制策略。这一战略有三个优势。首先，主换流站采用恒直流电压控制，可以为系统直流电压提供参考，有利于直流电压的稳定。第二，在主和辅助换流站的直流电压的集成控制有助于提供足够的有功功率控制（APC）和抑制大的功率变化。第三，APC换流站可以作为异常情况下直流电压控制的备用。为了保证系统在各种运行条件下的可靠性和稳定性，本文将直流电压控制优先引入到协调控制策略中。此外，还提出了该控制策略的控制器参数优化方法。最后，通过正常和异常情况下的仿真，验证了主辅控制的有效性。
Similar to other major electrical apparatuses, the reliability and stability of the dc network is becoming the most important issue when using the voltage-source-converter-based multiterminal dc (VSC-MTDC) system for offshore wind power integration. A coordinated control strategy of VSC-MTDC named master-auxiliary is proposed by combining the advantages of the voltage margin and voltage droop control. This strategy has three advantages. First, the master converter station with the constant dc voltage control can provide reference to the system dc voltage and is helpful for the stabilization of dc voltage. Second, the integrated control of the dc voltage in both master and auxiliary converter stations are helpful for providing adequate active power control (APC) and restraining large power variation. Third, the APC converter station can serve as a backup for the dc voltage control in abnormal conditions. In order to guarantee the reliability and stability of the system under various operating conditions, this paper introduces the priority of dc voltage control to the coordination control strategy. Moreover, a parameter optimizing method of controllers for this strategy is also proposed. Finally, the effectiveness of the master-auxiliary control is verified by simulations under normal and abnormal conditions.