不平衡负荷负序加权等效模型及其平衡化补偿方法

发布时间：2018-05-22 15:39

本文选题：三相三线制电路 + 不平衡负荷　；参考：《中国电机工程学报》2017年19期

【摘要】：补偿负荷不平衡时,通常以理想三相电压源电势作为公共连接点(point of common coupling,PCC)参考电压,实际系统中据此设计的补偿网络并不能完全平衡。对此,针对负荷不平衡的三相三线制电路,为更符合PCC处三相电压不对称的实际情形,该文考虑系统导纳,将系统侧等效为戴维南模型后,建立了不平衡负荷的负序加权等效模型;基于等效负荷参数,运用Steinmetz平衡化理论给出了相间补偿网络电纳的负序加权计算公式。网络参数是以加权系数为变量的函数,可兼容已有的针对三相三线制电路设计的平衡化补偿网络方法,为补偿的优化提供了理论基础。结合具体算例,该文给出了负序加权系数和补偿容量的三维关系图,以补偿容量最小为目标,确定出平衡化补偿的最优方案,仿真与物理实验验证了所提模型和平衡化方法的正确性。
[Abstract]:When the compensation load is unbalanced, the ideal three-phase voltage source potential is usually used as the common connection point of the reference voltage of the common coupling PCCs, and the compensation network can not be completely balanced in the actual system. In this paper, aiming at the three-phase three-wire circuit with unbalanced load, in order to meet the actual situation of three-phase voltage asymmetry at PCC, the system admittance is considered and the system side is equivalent to Thevenin model. The negative sequence weighted equivalent model of unbalanced load is established, and based on the equivalent load parameters, the formula of negative sequence weighted calculation for the electrical admittance of interphase compensation network is given by using the Steinmetz equilibrium theory. The network parameters are functions with weighted coefficients as variables, which can be compatible with the existing balanced compensation network methods designed for three-phase three-wire circuits, which provides a theoretical basis for the optimization of compensation. In this paper, a three-dimensional relationship diagram of negative sequence weighting coefficient and compensation capacity is given, and the optimal scheme of balancing compensation is determined by taking the minimum compensation capacity as the goal. Simulation and physical experiments verify the correctness of the proposed model and the balance method.
【作者单位】：新能源电力系统重点国家实验室(华北电力大学);
【基金】：国家自然科学基金青年基金项目(51207051)~~
【分类号】：TM714.3

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