含电池储能的直流配电网振荡抑制有源阻尼控制及参数计算方法  

Active Damping Control and Parameter Calculation for Resonance Suppression in DC Distribution Network

作　　者：罗华伟 王立娜 吴昌龙 徐志强 陈霖华 龚岸榕 李云丰 陈星 谭鑫 LUO Huawei;WANG Lina;WU Changlong;XU Zhiqiang;CHEN Linhua;GONG Anrong;LI Yunfeng;CHEN Xing;TAN Xin(Hunan Engineering Research Center of Large-scale Battery Energy Storage Application Technology(Hunan Economic Institute Electric Power Design Co.,Ltd.),Changsha 410007,Hunan Province,China;School of Electrical&Information Engineering,Changsha University of Science and Technology,Changsha 410114,Hunan Province,China;SPIC Hunan Loudi New Energy Co.,Ltd.,Loudi 417000,Hunan Province,China)

机构地区：[1]规模化电池储能应用技术湖南省工程研究中心(湖南经研电力设计有限公司),湖南省长沙市410007 [2]长沙理工大学电气与信息工程学院,湖南省长沙市410114 [3]国家电投集团湖南娄底新能源有限公司,湖南省娄底市417000

出　　处：《电网技术》2022年第11期4403-4413,共11页Power System Technology

基　　金：湖南省科技创新重大项目(2020GK1010);湖南经研电力设计有限公司科技项目(基于电池储能的交直流柔性配电网故障运行关键技术研究)。

摘　　要：运行于Buck模式的双向DC-DC变换器是引起直流配电网发生振荡失稳的主要因素之一。首先,该文通过简单的直流配电网案例,建立了三相VSC考虑交流系统动态过程的阻抗模型和双向DC-DC变换器的阻抗模型,分析了主电路参数、控制系统参数以及稳态运行点对两者阻抗模型的影响程度与规律,并揭示了直流网络等效电感和双向DC-DC变换器相互作用诱发直流配电网振荡失稳的机理。其次,从直流配电网振荡抑制所需的阻抗特性角度考虑,提出了一种双向DC-DC变换器反馈直流电流的有源阻尼控制策略,并研究了阻尼控制器参数对其阻抗特性的影响规律。再次,以电池储能装置并联谐振抑制和直流网络串联谐振抑制为约束条件,解析了阻尼控制器的参数选择范围表达式。最后,采用电磁暂态仿真验证所给计算公式的正确性。The bidirectional DC-DC converter operating in the buck mode is one of the main factors causing the resonant instability in the DC distribution network. Firstly, the impedance model of the three-phase VSC considering the dynamic process of the AC system and the one of the bidirectional DC-DC converter are established in this paper through a simple case of a DC distribution network. The influence of the main circuit parameters, the control system parameters and the steady-state operation points on their impedance models has been analyzed. The mechanism of the resonant instability in the DC distribution network induced by the DC network equivalent inductance and the bidirectional DC-DC converter is therefore revealed. Secondly, an active damping control strategy of the DC current feedback of the bidirectional DC-DC converter is proposed by considering the impedance characteristics required for the DC distribution network resonance suppression. After that, the influence of the damping controller parameters on its impedance characteristics is studied. Thirdly, taking the parallel resonance suppression of the battery energy storage device and the series resonance suppression of the DC network as the two constraints, the expression of the parameter selection range of the damping controller is presented. Finally, the correctness of the calculation formula is verified by the electromagnetic transient simulation.

关 键 词：直流配电网 电池储能 双向DC-DC变换器 谐振稳定性 阻尼控制 参数计算 

分 类 号：TM721[电气工程—电力系统及自动化]