Suzhou Electric Appliance Research Institute
期刊号: CN32-1800/TM| ISSN1007-3175

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含逆变型DG配电网的短路电流快速计算方法

来源:电工电气发布时间:2023-02-07 09:07 浏览次数:313

含逆变型DG配电网的短路电流快速计算方法

王德明,解晨,陈凯,毛晓姝
(陕西铁路工程职业技术学院,陕西 渭南 714000)
 
    摘 要:逆变型分布式电源 (IIDG) 接入配电网使得传统短路的电流计算方法不再适用。现有含 IIDG 配电网的短路计算方法基于节点阻抗矩阵迭代求解,当故障发生在线路中间时,存在计算量大、计算时间长的问题。通过对配电网故障时的复合序网分析,并考虑 IIDG 并网点电压和其输出电流的耦合关系,提出了一种以系统接入 IIDG 前三相金属性短路电流为初值,直接迭代计算含 IIDG 配电网短路电流的新方法。该方法不需要生成和处理节点阻抗矩阵,节点数目不影响计算用时,可快速计算含 IIDG 配电网的各种相间短路电流。通过算例仿真计算并与现有计算方法相比较,验证了所提方法的有效性和快速性。
    关键词: 配电网;短路电流计算;逆变型分布式电源;故障特性;复合序网
    中图分类号:TM464 ;TM711     文献标识码:A     文章编号:1007-3175(2023)01-0015-07
 
Short-Circuit Current Calculation for Distribution Network
Connected with Inverter Interfaced Distributed Generator
 
WANG De-ming, XIE Chen, CHEN Kai, MAO Xiao-shu
(Shaanxi Railway Institute, Weinan 714000, China)
 
    Abstract: The inverter interfaced distributed generator (IIDG) connected to the distribution network makes the traditional short-circuit current calculation method no longer applicable. The existing short-circuit current calculation for distribution network connected with inverter interfaced distributed generators, based on bus impedance matrix iteration, has two disadvantages-larger calculation amount and longer calculating time, especially when a fault occurs in the middle of the line. The authors, analyzing composite-sequence nets of faulted distribution network and considering the coupling relationship between PCC voltage and output current of IIDG, put forward a new method, which sets three-phase metallic short circuit with no IIDG connected to the system as initial value and uses direct iteration calculation. It is able to fast calculate inter-phase short circuit from IIDG connected to distribution networks because it does not need to generate and process bus impedance matrix and the number of nodes does not affect the calculating time. It is verified that this method is valid and efficient by comparing example simulation calculation with existing calculation methods.
    Key words: distribution network; short-circuit current calculation; inverter interfaced distributed generator; fault characteristic; composite-sequence net
 
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