Development Of The Controller Used In Magnetic-valve Controlled Reactor (MCR) Reacitve Power Dynamic Compensation Device

In the modern industry, with more and more large-scale power equipment widely used inindustrial production, the power environment inside factories becoming increasingly complex,especially the application of high-power inductive load causes low power factor of power gridand high power loss which may finally bring huge energy losses. In this context, the reactivepower compensation device came into being. The use of reactive power compensation device cannot only further improve power factor and save energy, but also bring notable economic profitfor the enterprise.At present, there are many types of reactive power compensation devices such as ThyristorControlled Reactor (TCR), Static Var Compensators (SVC), Static Synchronous Compensator(STATCOM) and Asynchronized Synchronous Compensators have been widely used in powersystems. As a new reactive power compensation device, Magnetic-valve controllable reactor(MCR) now also plays an important role in the power distribution networks. MCR is easilycontrolled, convenient maintenance, and can be directly applied in ultra-high voltage grid. Thedynamic reactive power compensation device based on MCR has become a new research topic inChina now.In this thesis, a brief introduction to the working principle of the MCR is proposed. It alsoprovides you with a simple analysis of the harmonic and control characteristics of the MCR. Adynamic reactive power compensation device based on MCR should be controlled automatically.To meet this requirement, a new design scheme of the automatic controller that uses PLC as thecore controller has been provided in this thesis. The automatic controller including reactivepower acquisition module, main controller module and SCR isolation trigger unit. UsingSEL-751relay protection instrument to acquire reactive power signal and transmit the signal tothe main controller; using KEYENCE KV-3000PLC as the main controller; and designed adigital trigger as the thyristor isolated trigger unit. The automatic controller can work in differentmode such as reactive power control mode, power factor control mode and the voltage controlmode. These operating modes can be selected according to the actual needs.After more than one year time in research and test, we designed and produced a set of MCRcontrol device. The device is almost combined of industrialized module, which ensures thestability and high reliability of the system, and makes system maintenance more convenient andfaster. At present, the control device has been tested at a low voltage level workshop, and theresults proved the feasibility of the design. The MCR control device has obtained the expectedresult and is currently being prepared for high voltage test.