基于Matlab的电力系统谐波评估研究

电力系统中,各种非线性设备向电网注入谐波电流,引起电网电压畸变,电能质量下降。因此,电力设备在接入电网之前,必须对其注入电网公共连接点的谐波电流进行评估,以便采取抑制措施。常规的谐波潮流计算的方法存在建立系统模型困难、计算繁琐等缺点。因此,采用M atlab的Powerlib工具对一座110 kV变电站建模分析,对注入系统的各次谐波含量进行了评估。结果表明,利用M atlab进行谐波评估具有建立模型简便,计算速度快的优点。

Research on harmonic calcluation of power system based on Matlab

In power system,harmonic from nonlinear loads has caused power network voltage distorted and power quality decreased.In order to suppress the harmonic,it is necessary to evaluate harmonic currents injecting into PCC of the equipment before being installed.Because custom harmonic flow caculation has the drawback of difficulty for building model and intricacy for counting,this paper proposes a method using the Powerlib in Matlab to build the model for a 110 kV substation,and assess the value of the harmonic currents emitting into the system.The result of harmonic evaluation indicates that the proposed method has the advantages of simply building model and rapid computation of the outcome.