Research on Inductance Converter Based on IGBT for Dynamic Reactive Power Compensation Device

Abstract

In power system, a large number of the inductive loads need the reactive power. These loads always make dramatic voltage fluctuation in power system. The traditional static reactive power compensator is difficult to meet the needs of the adjustable reactive power capacity .Therefore, a dynamic reactive power compensation method of the inductance converter based on IGBT is proposed in this paper. The following works have been done in the study: research of the inductance converter based on IGBT, modeling and simulation with MATLAB/SIMULINK, and its application in a dynamic reactive power compensation device. The hardware and software designs are realized in this paper, and it is subsequently verified experimentally. Experimental results show that inductance converter based on IGBT can be applied effectively in dynamic reactive power compensation. Introduction In power system, a large number of the inductive loads need the reactive power [1] [2]. The lack of energy and resources are increased, so that energy conservation has become a more serious issue. In order to effectively improve the utilization rate of energy, reactive power compensation plays an important role. But traditional static reactive power compensator is difficult to meet the needs of the adjustable reactive power capacity [3]. With the development of power electronic element, they are applied widely in inductance converter. Though, authors have advocated the use of inductance converter based on SCR for dynamic reactive power compensation [4]. Compared with SCR, IGBT is characterized by high reliability, fast switching speed and extensive applicability. So, the reactive power can be smoothly adjusted to achieve dynamic reactive power compensation. Therefore, inductance converter based on IGBT is researched in this paper. It is composed of inductance converter and electronic power inverter .The following works have been done in the study: research of inductance converter based on IGBT, modeling and simulation with MATLAB/SIMULINK, and its application in dynamic reactive power compensation. Topological Structure and Transforming Mechanism of Inductance Converter Based on IGBT The topological structure of inductance converter is shown in Fig.1. Single-phase inductance converter is taken as an example to analyze the transforming mechanism [5]. In following formulas, u1, U1, U1m are respectively the voltage of the primary side, the effective value of the voltage and the maximum value of the voltage of the primary side. Likewise, u2, U2, U2m are respectively the voltage of the primary side, the effective value of the voltage and the maximum value of the voltage of the second side. K is the ratio of L1 to L2. Let cutoff reverse IGBT or cutoff posi IGTB conduction reverse IGBT or conductio p IGBT f 1 2 1 2 tive ositive 0 1