Research On Dynamic Reactive Device Optimize Configuration Method In Receiving Systems

With the implementation and in-depth of the strategy of the transmission ofelectricity from the western to the eastern region, China has formed five large-scalereceiving systems: the eastern of China, the northeast of China, the central of China,the Guangdong-Fujian-Hainan district and Beijing-Tianjin-Hebei-Shandong district.Domestic and foreign scholars are focusing on how to improve the safety andstability of the receiving system with the characteristics of the overloaded by thereceiving systems, the increasing proportion of foreign fed, air-conditioning loadand constant power load is increasing over time etc. As the reactive power of shuntcapacitor is proportional to the square of the voltage and the output of reactivepower will decrease when failure occurs. Dynamic reactive power compensationdevice, represented by the static synchronous compensator (STATCOM), is theworld’s most advanced FACTS reactive compensation technology to provide fastreactive power compensation and voltage control, and it becomes the mostimportant means to solve the problem of dynamic voltage reactive power control inreceiving systems.Through analyzing the current situation and problems of dynamic reactivepower compensation optimization issues worldwide, this paper conduct researchon the actual characteristics of the receiving systems.The main contents of thispaper are as follows:Firstly, this paper emphasized the background and significance to install adynamic reactive power compensation device in receiving systems. Thenintroduced the basic concepts of dynamic reactive power compensation, comparingto the insufficient of a static reactive power compensation, dynamic reactivecompensation devices can provide rapid reactive support when failure occurs.Secondly,this paper introduced the principle of dynamic analysismethods,which can describe the rapid response equipments,include InductionMotors and DC Transmission System,in a more accurate way.Using the indexes ofimpedance modulus margin to determine the weak voltage area of receivingsystems,and put forward an analysis method of weak voltage area based on thedivision of electric scheduling according to the actual condition of the receivingsystem. Thirdly, this paper presents a trajectory sensitivity index considering theactual characteristics of STATCOM is calculated.Aiming at satisfying system’stransient voltage stability under the key fault state,model to analysis the voltageweak point circularly is built in order to get the best multiple installation sitessupporting the system’s transient voltage.Finally, since the probability of occurrence of voltage sags by the end of theactual large-scale grid voltage ambitious operation voltage instability or collapse,the paper consider the impact of failures on the power quality, the introduction ofrisk theory all risk indicators are translated into the cost of dynamic reactivesettlements to optimize the capacity of the installation.From both the possibilityand severity of voltage sags analysis finally obtain the function expression considerthe cost of the loss of voltage sags, line power loss costs and investment costs forthe STATCOM,making the install dynamic reactive compensation equipment tomaximize revenue expectations after. At last describes in detail the dynamicreactive power optimization of specific processes.A complete set of dynamic reactive power compensation device program hadbeen achieved by calculation and simulation results of Guangdong power grid.Theeffectiveness and practicality of the method described in this article is verified.