Imbalance compensation and ant colony optimization method of static reactive compensator

Abstract

The invention discloses an imbalance compensation and the ant colony optimization method for an SVC. The method is based on a variable structure to control the SVC, wherein, the variable structure control method comprises two aspects of the unbalanced load equalization compensation and the parameter control of a PI controller, wherein, the unbalanced load equalization compensation adopts the SVC compensation susceptance computational method which is based on the synchronous rotation reference coordinate transformation of a virtual symmetrical three-phase system; meanwhile, in the stabilization control of the system voltage, the ant colony algorithm optimization method is adopted to real time adjust and to optimize the parameter kp and ki of the PI controller. The invention ensures that the SVC can not only complete the unbalanced load equalization compensation but also control the stabilization, thereby raising the precision of the susceptance computation of the SVC, guaranteeing the balance compensation of the charge, improving the performance in the stabilization control of the SVC voltage and maintaining the voltage stabilization of a common connection joint. Therefore, the invention has high robustness and high response speed.

Description

technical field [0001] The invention relates to a control method, in particular to an unbalance compensation and ant colony optimization method of a static var compensator. Background technique [0002] With the increasing nonlinear, impact and unbalanced loads in the distribution network, power quality problems such as voltage fluctuations, voltage flicker and voltage unbalance in the distribution network are also becoming more and more serious. Users have brought adverse effects, and the power quality control of distribution network is urgent. Static var compensator SVC is an important user power device. It is used in dynamic var compensation of electric arc furnaces because of its optimal performance and price ratio. It can comprehensively solve the above-mentioned power quality problems. SVC has the functions of unbalanced load balance compensation and system voltage stability control, so it is of great significance to carry out research on unbalance and voltage stabili...

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Problems solved by technology

[0006] In order to achieve the above object, the technical solution adopted by the present invention to solve the technical problem is: a static var compensator imbalance compensation and ant colony optimization method, based on variable structure to control the static var compensator SVC, variable structure control The method includes two aspects: unbalanced load balancing compensation and parameter control of PI controller. The unbalanced load balancing compensation adopts the SVC compensation susceptance calculation method based on the synchronous rotating reference coordinate transformation of the virtual symmetrical three-phase system, which can effectively Eliminate the influence of unbalance and harmonics; at the same time, in view of the problem that the structure of the traditional PI controller is simple and easy to implement and the static var compensation system is difficult to establish an accurate mathematical model, the ant colony algorithm optimization method is used for the stability control of the system voltage. Parameter k of the PI controller p 、k i Perform real-time adjustment and optimization to optimize the dynamic response process of the SVC system

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