Novel MTDC droop scheme with decoupled power control for enhancing frequency stabilities of weak AC systems
Novel MTDC droop scheme with decoupled power control for enhancing frequency stabilities of weak AC systems
复制标题
具有解耦功率控制的新型 MTDC 下垂方案，可增强弱交流系统的频率稳定性
DOI：
10.1049/iet-rpg.2019.1503
复制
发表时间：
2020-05
影响因子：
2.6
通讯作者：
Ke Jia
中科院分区：
文献类型：
--
作者：
Yujun Li;Sining Liu;Jiebei Zhu;Xiaotian Yuan;Zhao Xu;Ke Jia
传统的MTDC系统为接入的弱交流系统提供频率支持的方法是根据弱电网的频率偏差，在标准的功率共享下垂控制下修改各变流器的功率基准。然而，该方案人为地耦合了所有异步交流系统，以解决任何连接的交流系统的频率干扰，这可能导致更宽的频率干扰传播。为了克服这个问题，本研究提出一种解耦频率控制（DFC）方案来改善弱交流系统的频率稳定性。首先，通过对MTDC功率流方程的线性化，推导出各变流器有功功率与功率设定点之间的关系。然后，推导了采用传统频率控制的各交流系统的频率耦合特性，表明频率扰动会传播到采用传统控制的所有连接的交流系统中。此外，通过定义的解耦矩阵推导了该DFC中各变换器的控制规律，得到了各变换器的独立频率调节特性。最后，通过数值仿真验证了所提出的DFC方案在主电网和弱电网中负荷变化和变换器损耗情况下的有效性。
Traditional way to enable frequency support provided by MTDC system for the connected weak AC systems is to modify the power reference of each converter under standard power-sharing droop control based on the weak grid's frequency deviations. However, this scheme artificially couples all asynchronous AC systems to tackle with the frequency disturbances of any connected AC systems, which might result in broader frequency disturbance propagations. To overcome this, this study proposes a decoupled frequency control (DFC) scheme to improve weak AC systems frequency stabilities. First, the relationship between the active power and power set points of each converter is derived by the linearization of MTDC power flow equations. Then, the frequency coupling properties of each AC system with traditional frequency control are derived, and it shows that the frequency disturbance will be propagated to all the connected AC systems with traditional control. Furthermore, the control law of each converter in the proposed DFC is developed through the defined decoupled matrix, and the independent frequency regulation characteristic of each converter can be obtained. Finally, numerical simulations have demonstrated the effectiveness of the proposed DFC scheme in events of load changes and converter loss in the main and weak AC grid.
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DOI：
10.1109/ias.2013.6682484
发表时间：
2013-12
期刊：
2013 IEEE Industry Applications Society Annual Meeting
影响因子：
--
作者：
Chenghao Li;P. Zhan;J. Wen;M. Yao;Naihu Li;Weijen Lee
通讯作者：
Chenghao Li;P. Zhan;J. Wen;M. Yao;Naihu Li;Weijen Lee
影响因子：
6.6
作者：
Jiebei Zhu;C. Booth;G. Adam;A. Roscoe;C. Bright
通讯作者：
Jiebei Zhu;C. Booth;G. Adam;A. Roscoe;C. Bright
影响因子：
6.6
作者：
Sai Gopal Vennelaganti;N. Chaudhuri
通讯作者：
Sai Gopal Vennelaganti;N. Chaudhuri
影响因子：
6.6
作者：
N. Chaudhuri;B. Chaudhuri
通讯作者：
N. Chaudhuri;B. Chaudhuri
影响因子：
6.6
作者：
N. Chaudhuri;R. Majumder;B. Chaudhuri
通讯作者：
N. Chaudhuri;R. Majumder;B. Chaudhuri