Interval reactive power optimization model linearization solution method

Abstract

The invention discloses an interval power flow calculation method in rectangular coordinate form based on linear programming. The method comprises the following steps: 1) establishing an interval reactive power optimization model: enabling both active output of an electric generator and load to be expressed in the form of an interval, and then, substituting the active output and load into a power flow equation in a certainty reactive power optimization model to obtain the interval reactive power optimization model; 2) classifying variables in the interval reactive power optimization model into two classes, one class of variable is a control variable capable of being controlled manually, and the other class of variable is a status variable changing with the control variable; 3) constructing a linear iterative model of the interval reactive power optimization model; 4) solving a linearized model for line interval reactive power optimization through a simplex method, and carrying out iteration repeatedly; and 5) outputting a result. The method has the advantages of being good in convergence, capable of ensuring that the obtained reactive power voltage control strategy completely meets security constraints for grid operation and high in efficiency and the like.

Description

technical field [0001] The present invention relates to a method for solving uncertain reactive power optimization problems in electric power systems. When solving reactive power optimization problems involving uncertain parameters, the method expresses uncertain parameters as intervals and assumes that all variables are is continuous, the optimal solution of the model is approached by the stepwise linearization method, and the optimal solution that truly satisfies the constraints of the uncertain reactive power optimization problem is obtained. Background technique [0002] The power system itself contains many uncertain factors, such as frequently changing commercial and residential loads, wind power, photovoltaic unit output that is difficult to predict accurately, and measurement errors of electrical parameters. The existence of these uncertain factors makes various optimal power flow models established based on grid parameters uncertain, while traditional deterministic ...

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Problems solved by technology

However, the convergence of the iterative algorithm it uses cannot be guaranteed, and the calculation time is too long to achieve real engineering practicality.

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