Active power distribution network reactive power control method with limitation to number of operating times of capacitor taken into account

Abstract

The invention relates to an active power distribution network reactive power control method with limitation to the number of operating times of a capacitor taken into account, and belongs to the technical field of operation and control of an electric power system. The method includes the steps that a three-phase branch trend equation of an active power distribution network is provided, a reactive power control objective function is established, and various actual restraints are comprehensively taken into account; a second order cone slack technology is utilized to handle a reactive power control problem; eventually a second order cone programming algorithm is utilized to conduct calculation to acquire reactive power control values and operating moments of a disperse reactive compensation device, the capacitor, a continuous reactive compensation device and a distributed power supply, and therefore active power distribution network reactive power control with the limitation to the number of the operating times of the capacitor taken into account is achieved. The method can be used for radial and annular active power distribution network reactive power control with the limitation to the number of the operating times of the capacitor taken into account, and control accuracy is high. The second order cone slack technology and the second order cone programming algorithm are adopted, and therefore both optimality and solve efficiency of active power distribution network reactive power control are greatly improved.

Description

technical field [0001] The invention relates to a reactive power control method of an active distribution network considering the limitation of capacitor operation times, and belongs to the technical field of power system operation and control. Background technique [0002] In recent years, the penetration rate of distributed generation (Distributed Generation, DG), energy storage devices and reactive power compensation devices in the distribution network has gradually increased, and the traditional distribution network has gradually become an adjustable and controllable active distribution network. In the daily management of the power grid, under the time-varying load power and photovoltaic forecast power output data, there are many challenges to face: [0003] 1. In the distribution network reactive power control problem, in addition to continuously adjustable distributed power reactive power, continuous reactive power compensation device reactive power and other continuou...

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Problems solved by technology

[0004] 2. In the actual power grid operation, frequent and disorderly operation of capacitors in a dispatch cycle will not only increase the workload of operators, but also cause severe voltage fluctuations, increase the active power loss of the active distribution network, and reduce the service life of capacitors

[0005] 3. Regarding the non-convex programming problem of dynamic reactive power optimal control with discrete variables, the heuristic two-stage method and the direct rounding method of discrete variables used at present will have a negative impact on the equality constraints and the optimality of the objective function. However, there is still a lack of a solution method that can strictly balance the optimality of the solution and the computational efficiency in theory.

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