Research Of Substation Voltage Reactive Power Control Based On Human-Simulated Intelligent Control

With the development of society, electric customers pay more and more attention to the quality of distribution systems operation. Voltage and reactive power optimal control is an effective means to secure the security, economy, reliability and quality of its operation. In our country, on-load tap-changing transformer and shunt capacitor are the main equipments of voltage and reactive power control in high and medium voltage distribution system. At the same, Human-Simulated Intelligent Control (HSIC) is a theory developing greatly in recently twenty years, and succeeds in great number of practical applications. This thesis mainly focuses on the study of HSIC controlling strategy of the on-load tap-changing transformers and shunt capacitors in high and medium voltage distribution system.Based on the background on the voltage and reactive power control in distribution power system, this paper explains the need and feasibility of study on this subject. The development and the actuality of voltage quality control (VQC) have been introduced. The intention, principle and model of the distribution systems VQC have been discussed in detail. The influences of adjusting on-load tap-changing transformer and shunt capacitor on the voltage and reactive power have been deduced by expressions. Also, the principle and limitation of traditional Nine-area method have been discussed. Therefore, a multiple-input and multiple-output model of distribution voltage and reactive power is established, and its new solution, HSIC is put forward.In this thesis, the voltage and reactive power HSIC system hardware and software have been designed; the flowchart of hardware and software module design for the main system has been introduced. With the HSIC"equivalent"concept and method, a voltage and reactive power HSIC algorithm has been designed. With the combination of substation transformer mathematic model, 110kV substation voltage and reactive power control system model has been simulated in MATLAB by HSIC and the Nine-area method. Simulation results show that the voltage is qualified and reactive power is greatly improved, the regulation number of on-load tap-changing transformer and shunt capacitor which use voltage and reactive power HSIC arithmetic are much less than using nine-area method. The examples demonstrate that, the model of voltage and reactive power control in distribution power system is rational, and the HSIC algorithm is feasible and valid to solve the above problems.