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1.南京南瑞继保电气有限公司,江苏省南京市 211102
2.南瑞集团有限公司(国网电力科学研究院有限公司),江苏省南京市 211106
吴小丹(1982—),男,通信作者,硕士,高级工程师,主要研究方向:柔性交直流输电系统及应用、柔性低频输电系统。E-mail:wuxd@nrec.com
卢宇(1979—),男,硕士,高级工程师,主要研究方向:柔性交直流输电技术、特高压直流输电技术。E-mail:luy@nrec.com
董云龙(1977—),男,硕士,研究员级高级工程师,主要研究方向:柔性交直流输电技术、特高压直流输电技术。E-mail:dongyl@nrec.com
收稿日期:2022-04-14,
修回日期:2022-06-06,
网络出版日期:2022-08-03,
纸质出版日期:2022-10-10
移动端阅览
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WU Xiaodan,LU Yu,DONG Yunlong,et al.Two-phase Operation Control Strategy on Low-frequency Side of Two-terminal Flexible Low-frequency Transmission System[J].Automation of Electric Power Systems,2022,46(19):132-144.
吴小丹,卢宇,董云龙等.双端柔性低频输电系统低频侧两相运行控制策略[J].电力系统自动化,2022,46(19):132-144. DOI: 10.7500/AEPS20220414001.
WU Xiaodan,LU Yu,DONG Yunlong,et al.Two-phase Operation Control Strategy on Low-frequency Side of Two-terminal Flexible Low-frequency Transmission System[J].Automation of Electric Power Systems,2022,46(19):132-144. DOI: 10.7500/AEPS20220414001.
基于模块化多电平矩阵变换器(M3C)的柔性低频输电系统(LFTS)具备低频侧两相运行能力,但其控制策略需特殊设计。文中首先介绍了双端柔性LFTS的基本情况及两相运行的基本要求,给出基于工、低频侧输入解耦及桥臂环流控制的M3C数学模型。为实现低频侧不对称运行条件下桥臂子模块电容电压的均衡,提出M3C桥臂功率再平衡的双重低频环流控制法。然后,分别给出两相运行条件下
V
/
f
站和
PQ
站的低频侧输入电流控制策略,并在静止坐标系统通过对9个桥臂电流的完全独立控制实现两个站M3C的控制。最后,在实时数字仿真系统中搭建双端柔性LFTS仿真模型,分别对稳态、动态及交流系统不对称故障等典型工况进行仿真测试。仿真测试结果表明,所提控制策略可有效实现双端柔性LFTS的低频侧两相运行要求。
The flexible low-frequency transmission system (LFTS) based on the modular multilevel matrix converter (M3C) has the capability of two-phase operation on the low-frequency side
but its control strategy needs special design. First
this paper describes the basic condition of two-terminal flexible LFTS and the basic requirements of two-phase operation
and proposes a mathematical model of M3C for fundamental-frequency and low-frequency side input decoupling control and bridge arm circulating current control. In order to balance the capacitor voltage of bridge arm sub-modules under the asymmetric operation condition on the low-frequency side
a dual low-frequency circulating current control method for rebalancing the bridge arm power of M3C is proposed. The input current control strategy on the low-frequency side of
V/f
and
PQ
stations under the two-phase operation condition is given
respectively. Then the control of M3Cs for two stations is realized by completely independent current control of nine bridge arms in the static coordinate system. Finally
the simulation model of a two-terminal flexible LFTS is built in the real-time digital simulation (RTDS) system
and simulation tests are carried out for typical operation conditions such as the steady-state operation
the dynamic operation and the AC system asymmetric fault. The simulation test results show that the proposed control strategy can effectively meet the requirements of two-phase operation on the low-frequency side of the two-terminal flexible LFTS.
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