Hou Junxian

A synthesis load model with distribution network for power transmission system simulation and its validation

The deficiencies of existing load models and their implementations in power system simulation programs are addressed in this paper. To improve the load model for power system simulation, a Synthesis Load Model (SLM) with distribution network, which is consistent with the structure of power loads and distribution networks, is presented. The SLM is reasonable in structure and convenient to use. The SLM can simulate the load components and distribution systems including distribution network, reactive compensation and the generators connected to low voltage networks. The validity of SLM has been validated by four field tests of three-phase short circuit in Northeast China Power Grid in the years of 2004 and 2005 respectively.

An electromechanical/electromagnetic transient hybrid simulation method that considers asymmetric faults in an electromechanical network

This paper proposes a method to perform electromechanical and electromagnetic transient hybrid simulation, including the interface location, the mutual equivalence solution of the electromechanical system and the electromagnetic system, which can perform excellently when the positive and negative sequence parameters of the equivalent circuit are different. The least square method is adopted to obtain the fundamental frequency current as the equivalent solution of the electromagnetic system. The method was demonstrated to be effective and feasible through two cases. It solves hybrid simulation problems when variable faults (including asymmetric faults) occur in an electromechanical network.

Research on modular electromechanical transient modeling of UPFC based on VSC

This paper presents an efficient modular electromechanical transient modeling method of unified power flow controller (UPFC) based on voltage source converter (VSC). The most distinctive advantage of the modeling method proposed in this paper is that it can be applied to the simulation of different UPFC structures and access ways. This method is based on basic VSC-based UPFC rules. Firstly, transform different VSC topology structures into unified and equivalent current circuit. Next, divide UPFC into four modules: series module, parallel module, DC module and control module. Then, calculate each module in turn. Finally, solve the UPFC part and the network equation alternately until the convergence is reached. This modeling method has already been applied and proved effective in “PSD” power system analysis tools. The accuracy of the model is verified by the example analysis and the comparison with the Real Time Digital Simulator (RTDS) dynamic test curve.

The dynamic simulation model and parameter identification method of DFIG type wind generator for power system electro-mechanic simulation

The double-fed inductor generator (DFIG) is one important type of wind generator. Because of high percentage of wind energy, it is necessary to build accurate wind generator model and parameters for power system electro-mechanic simulation. The paper mainly presents the simulation model and parameter identification method of DFIG type wind generators. For power system transient simulation, the characteristic related to low voltage ride-through (LVRT) is most important, and the model related to LVRT is mainly presented. The parameters of the model are divided into three types and use different identification method. The identification method of important parameters is mainly presented. One actual wind generator is used as an example to explain the identification process and testify the validity of the model.