摘要
提出一种三相四线制台区电网的状态估计模型。综合考虑电源和负荷端点三相节点的注入电流量测方程、中性点的虚拟量测方程、三相电压幅值量测方程以及T端点三相和中性点的零注入等式约束方程,以端点a、b、c三相及中性点电压的实部和虚部为状态变量,建立台区电网带等式约束的加权最小二乘状态估计模型。该模型采用牛顿法进行求解,并以IEEE13节点修正系统为例进行仿真分析。仿真结果表明,所提模型可有效解决台区电网的状态估计问题,且方法收敛可靠,速度快,满足工程要求。
A state estimation model is proposed for three-phase four-wire area load. Considering the three-phase node injection current, neutral virtual and voltage amplitude measurement equations of power source and load endpoints, and three-phase zero injection equality constraint equations of T endpoints, a weighted least squares theory state estimation model with equality constraints is developed, which takes the real and imaginary parts of three-phase a, b, c and neutral voltages as state variables. Newton method is used to solve the presented model, and the modified IEEE-13 bus system is used for simulation. The results show that it is effective to solve state estimation problems for area load, and the method shows reliable convergence, fast speed, thus can meet engineering requirements.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2013年第23期79-84,共6页
Power System Protection and Control
关键词
台区电网
三相四线制
状态估计
最小二乘法
注入电流方程
area load
three-phase four-wire
state estimation
least squares theory
injection current equation
