不平衡负载接入电网电能计量表电能测量方法研究

Research on Electric Energy Measurement Method of Energy Measurement Instruments with Unbalanced Load

新能源接入电网的装机容量不断增加,其随机性、波动性、间歇性等特点降低了电力系统的抗干扰性。而大量非线性负载,如电力电子装置的接入电网的容量不断增加,该类负载可导致电网电压骤降、骤升等问题,也导致了电网的随机性、不确定性增加,进一步降低了电力系统的抗干扰性。且该非线性、不对称负载接入电网,将导致电能测量的准确性降低。针对三相不平衡电网提出了前推回代潮流计算方法测量电能,并以一个10节点的电网作为仿真对象。仿真结果表明:当负载接入的节点越远,平衡节点处的功率变化越大。

The installed capacity of new energy connected to the power grid is increasing,and its randomness,volatility,intermittency and other characteristics reduce the anti-interference of the power system.And a large number of nonlinear loads,such as the capacity of power electronic devices connected to the grid is increasing,such loads can lead to grid voltage plummeting,sudden rise and other problems,but also lead to the randomness and uncertainty of the grid increase,further reduce the anti-interference of the power system.The nonlinear and asymmetrical load is connected to the power grid,and the accuracy of electric energy measurement will be reduced.In this paper,a calculation method of forward push-back generation power flow is proposed to measure the electric energy of three-phase unbalanced power network,and a 10-node power network is taken as the simulation object.The simulation results show that:when the load access node is farther away,the power change at the balance node is greater.