Study On The Networkde TSC Type Reactive Compensation Device In The Low Voltage And Three-Phase System

As a necessary part of the normal power grid, reactive power is the indispensable key in the power system. It is a great energy loss and poor economy in china’s low voltage power grid because of the reactive power shortage and low power factor which generally exist in china’s current power grid especially the part of0.4kv. Therefore, the study of low voltage power grid on the reactive power compensation technology and enhance china’s power factor of low voltage grid have a very important function and meaning in saving energy and reducing consumptionThis paper introduces the development of the reactive power compensation and the present research situation of both at home and abroad, and then, analyses the TSC type of reactive power compensation equipment such as its control strategy and trigger mode technology, act. In this paper the hardware circuit is designed based on the digital signal processor TMS320LF2812produced by TI Corporation, including the power modules, data sampling process module, keyboard and displaying module and communication module, etc. In order to the data transmitting with the existing power system easily, PROFIBUS system is chosen to complete network design of this system, and the hardware system of PROFIBUS interface is designed. To software design, this paper adopts the C language and gives software system structure diagram; we use the method of modularization which can improve the universal trait of the program and simplify the device’s maintenance. The system adopts thyristor as zero-crossing switch that connect capacitors to main circuit, and it actualizes the capacitor’s speediness, no arc, no percussion switching. About the detection algorithm, an improved reactive current detection algorithm is developed based on instantaneous reactive power theory which can reduce the difficulty of circuit design and the complex degree of debugging, at the same time, the response time of the system can be improved too; a control strategy based on the improved nine domains method is put forward, which can avoid oscillation effectivelyThe simulation model of main circuit is established and simulated in MATLAB. The result of simulation shows that the hardware structure and the choice of the control mode can be good to complete the work of reactive power compensation. So it comply with the design requirements.At last, the work in this paper is summarized, and looks into the future and the technology of the development of reactive power compensation.