Design And Application Of Reactive Power Compensation In Power Supply System Of Majiliang Mine

Behind the rapid economic development in today's society,it is also accompanied by a large consumption of coal resources.Although countries around the world propose to use new energy to replace traditional coal resources,coal resources still occupy a dominant position due to the instability of new energy sources.In the process of mining coal resources,a large number of high-power equipment is generally used.These equipment will consume a large amount of reactive power during operation,which will reduce the efficiency of equipment operation and even affect the normal production of coal mining enterprises.In the traditional reactive power compensation process,capacitors are generally used for reactive power compensation,but this kind of device has poor dynamic performance during the reactive power compensation process and is prone to resonance with the power grid.The static var generator(SVG,Static Var Generator)can dynamically compensate the reactive power in the power supply system according to the actual demand in the power grid.However,due to the lack of experience in the use of SVG in coal mine enterprises,and the current SVG control algorithm Many defects require further improvement.For this reason,this article will design SVG and put it into operation in Majiliang Mine to provide experience for the management of reactive power deficiency in mining enterprises.In the research process of the thesis,first of all,the power supply system of Majiliang Mine was analyzed,and the current power quality problems such as reactive power,harmonics and power factor in Majiliang Mine were clarified,and SVG was proposed to achieve the current compensation measures.Centralized compensation of reactive power.Secondly,it analyzes the basic structure and working principle of SVG.Through the analysis of several current topological structures of SVG,the shunt voltage type SVG structure with superior performance is selected as the research object of this article.The input-output relationship and system topology are used to model SVG,and the steady-state operation of SVG is analyzed.It is clear that SVG can output corresponding reactive power according to the needs of the system during operation.At the same time,after comparing and analyzing the common pq method and dq reactive current,it is pointed out that these two reactive current detection methods have shortcomings,and then an improved dq method is proposed to detect reactive current,thereby improving the system performance Compensation accuracy.Then,based on the research and analysis of the working principle of SVG,the corresponding control strategy is designed.In the control strategy design process,it mainly includes the design of the voltage outer loop control strategy and the current inner loop control strategy.Among them,the voltage outer loop control strategy In the design,in view of the problems of the traditional PI control strategy,the sliding film control algorithm is used to improve the stability of the DC side voltage.In the process of current inner loop control,the method of current loop decoupling is mainly used to reduce the correlation between parameters,thereby increasing the control difficulty of the equipment.Finally,simulations verify that the control algorithm designed in this chapter is accurate and effective.Finally,based on the basis of the previous article,the SVG prototype is designed.During the design process,the peripheral hardware circuit and algorithm corresponding software system of the system are designed.After the design is completed,the designed device is used to design the The algorithm was verified,and after the experiment was completed,it was put into operation and analyzed,and the analysis results verified that the device designed in this paper can effectively solve the power quality problem of Majiliang Mine.