### Genetic Algorithm Based Proportional- Integral Controller for Synchronous VAR Compensator

#### Abstract

**Abstract.**Proportional- Integral (PI) controllers are one of the most popular controllers in industry. In this paper, this controller is applied to control the fire angle of synchronous VAR compensator (SVC). The SVC is member of FACTS device that have excellent properties in reactive power control and real power loss reduction. In synchronous VAR compensator, the fire angle controls the level of injected reactive power to power network. Therefore the value of the fire angle must be controlled based on power network condition. In this paper the usage of PI controller is proposed for this purpose. In PI controller, the parameters of this controller have vital role in performance of controller. If these parameters don’t tuned properly, the controller will has poor performance. Therefore in this study, a novel method is proposed for selecting of these free parameters. In the proposed, genetic algorithm is used to tune the free parameters of PI controller. The proposed method is tested on power network

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