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新能源电力系统国家重点实验室(华北电力大学),北京市 102206
王晨欣(1998—),男,硕士研究生,主要研究方向:高压直流输电技术。E-mail:wangchenxin0831@163.com
夏嘉航(1996—),男,博士研究生,主要研究方向:高压直流输电、电流源换流器。E-mail:xxxiajiahang@163.com
赵成勇(1964—),男,通信作者,教授,博士生导师,主要研究方向:高压直流输电。E-mail:chengyongzhao@ncepu.edu.cn
收稿:2021-06-21,
修回:2021-09-22,
网络出版:2021-11-24,
纸质出版:2022-03-10
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王晨欣,夏嘉航,赵成勇等.降低直流线路损耗的并联电容换相换流器单位功率因数控制策略[J].电力系统自动化,2022,46(5):141-150.
WANG Chenxin,XIA Jiahang,ZHAO Chengyong,et al.Unity Power Factor Control Strategy for DC Line Loss Reduction in Shunt Capacitor Commutated Converter[J].Automation of Electric Power Systems,2022,46(5):141-150.
王晨欣,夏嘉航,赵成勇等.降低直流线路损耗的并联电容换相换流器单位功率因数控制策略[J].电力系统自动化,2022,46(5):141-150. DOI: 10.7500/AEPS20210621007.
WANG Chenxin,XIA Jiahang,ZHAO Chengyong,et al.Unity Power Factor Control Strategy for DC Line Loss Reduction in Shunt Capacitor Commutated Converter[J].Automation of Electric Power Systems,2022,46(5):141-150. DOI: 10.7500/AEPS20210621007.
电网换相换流器的交流滤波器组和无功补偿装置占地面积大,在交流电网故障时容易发生换相失败;改进型并联电容换相换流器(ESCCC)能减小换流器占地面积,提高抵御换相失败的能力,但通过阀侧电容投切实现单位功率因数控制会影响谐波特性。针对此问题,并考虑直流线路损耗优化,文中提出了一种基于ESCCC并结合交流母线侧电容投切的新型单位功率因数控制策略。首先,建立了拓扑结构和数学模型,分析了单位功率因数控制的原理;然后,提出新型控制策略,采用新的谐波评价指标设计了滤波电感、电容等参数;最后,在PSCAD/EMTDC中搭建仿真模型,验证控制策略的有效性和参数设计的合理性。仿真结果表明,ESCCC能在全工况下实现单位功率因数控制,并且降低了直流线路损耗和换相失败概率。
The AC filter bank and reactive power compensation device of the line commutated converter (LCC) occupy a large area
and LCC is prone to commutation failure when the AC power grid fails. The evolutional shunt capacitor commutated converter (ESCCC) can reduce the occupied area of the converter and improve the ability to resist commutation failure
but the realization of unity power factor control through the valve-side capacitor switching will affect the harmonic characteristics. To solve these problems
and considering the optimization of DC line loss
this paper proposes a new unity power factor control strategy based on ESCCC combined with the capacitors that can be switched on the AC bus. Firstly
the topological structure and mathematical model are established
and the principle of unity power factor control is analyzed. Secondly
a new control strategy is proposed
and the filter inductance
capacitance and other parameters are designed by adopting the new harmonic evaluation index. Finally
a simulation model is built in PSCAD/EMTDC to verify the effectiveness of the control strategy and the rationality of the parameter design. The simulation results show that ESCCC can achieve unity power factor control under all operation conditions
and reduce the DC line loss and the probability of commutation failure.
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