基于电流幅值量测的微电网状态估计

Abstract

在微电网能量管理中，实时数据库中数据的可靠性和准确性是进行控制、操作及准确分析的基础。数据采集系统中采集的实时数据不齐全以及量测数据不精确是潮流计算等高级分析功能难以解决的，因此对微电网实时数据进行状态估计势在必行。本文在分析了状态估计基本原理的基础上，采用以支路电流的实部和虚部为状态变量的状态估计方法，对微电网中7条支路进行状态估计，其理论估计的支路电流幅值和实际值偏差处于可接受范围之内。 The reliability and accuracy of real-time data in the database is the foundation of control, operation and accurate analysis in the micro-grid energy management. The data collection of the real- time data acquisition system is not complete and there are inaccurate measurements; it’s difficult for the power flow calculation and other advanced analysis functions to resolve those problems. So the micro-grid state estimation for the real-time data is imperative. In this paper, seven bran- ches in the micro-grid are analyzed in state estimation after the analysis of the basic principles of state estimation using the real and imaginary parts of the current in branches as the state variables. The deviation of theoretical estimate of the branch current amplitude and the actual value is within the acceptable range.