Modeling Of Lingbao Back-to-Back System And Its Steady State Simulation

Lingbao Back-to-Back(BTB) converter station is the first Interconnected large networks of DC BTB converter station project, and also China's first independent design, independent manufacture and independent construct of the DC project. It implements the interconnection of the central China power grid and the northwest power grid, it is an important step of the implementation of the State Grid Corporation of regional power grid interconnection, and gradually realize in the national network. It is important tool of the State Grid Corporation of optimizing resource allocation, improve grid reliability and maximize economic benefits. In actual operation of Lingbao Converter Station, in order to get a satisfactory operating performance, it is expected to make possible problems and solutions are given in advance.With the opening of Zhengzhou-Xi'an high-speed rail, Lingbao traction substations and negative sequence harmonics caused Lingbao Converter Station is bound to affect the operation, therefore, is simulated converter station is very meaningful.This thesis analyzes the role of the various components of Lingbao BTB system, introduced the equivalent model and parameters,built the simulation model of the main circuit,control system and the filter system model of AC side by using electromagnetic transient simulation software PSCAD/EMTDC(Power System Computer Aided Design/Electro-Magnetic Transient in DC system).The steady state of this system are analyzed based on the model, mainly as follows:Lingbao Converter Station I and II of the DC system and AC system of parameters of simulation content for the I parameter of the DC field,220kV side of the issue of reactive power reactive power component, I component of the 330kV side of the reactive Issued by the reactive power, I on the AC electrical quantities into the line,Ⅱof the DC field parameters, II of the 500kV side of the issue of reactive power reactive power components, II of the 33OkV side of the issue of reactive elements and reactive power into ACⅡLine of electrical quantities.To simulation for the two factors of asymmetry: asymmetric of three-phase voltage of Non-features harmonic wave on converter station, interval asymmetric of converter firing angle (turn-off angle).To simulation for Lingbao Converter Station steady-state operation at full load, the AC side of converter transformer winding current harmonics and filter the current harmonics absorbed.