Research On Optimal Allocation Of Multi-type FACTS In Henan Grid

Recently, the rapid development of Chinese power grid has made the improvement of the interconnection scale and complexity. Therefore, it is important to improve the static voltage stability under the precondition of ensuring the safe and stable operation of the power grid. The application of FACTS technology provides an effective means. For large AC and DC hybrid power grid, the choice of FACTS installation location and capacity directly determine the effect of their application in power system. With the stable operation demand of power grid, how to choose the access location, type and capacity of FACTS is an urgent problem to be solved.This thesis takes the±800kV,8000MW UHVDC from Hami to Zhengzhou (Ha-Zheng DC for short) and Henan power grid as the research object. Multiple FACTS devices are accessed to this large and complex system to analyse the static voltage stability, and the optimization configurations of FACTS are provided. The main results are as follows:(1) The basic principle and structure of the FACTS instrument are analyzed. Based on the power injection method, a UPFC mathematical model is established. The UPFC, TCSC and STATCOM simulation models are set up in the PSASP. The simulation results of the FACTS mathematical models verify the validity of the simulation models and show that the FACTS have effective flow control capability.(2) The installation locations of FACTS are studied. The UPFC which represents the combination of series and parallel compensation, the TCSC which represents the series compensation, and the STATCOM which represents the parallel compensation, are all selected and analyzed. The line participation factors and sensitivity coefficients of the aforementioned FACTS can be obtained using modal analytical and sensitivity analytical methods. The weak buses of voltage stability and the transmission lines which are able to effectively improve looad carrying capability can also be discovered. All these discoveries formed the basis for selecting the installation sites of FACTS.(3) In order to achieve the goals of improving system static voltage stability level as well as reducing investment costs, this thesis designs a FACTS optimization mathematical model and establishes a FACTS investment cost function. This multi-objective function should conclude the system looad capacity index and FACTS investment cost And it should explain the optimization problems. The PSO algorithm is selected to calculate the optimal solutions of Pareto to obtain the configuration optimization scheme of FACTS we pursued.(4) The AC and DC hybrid Henan grid is chosen for case study. Based on the previous results of prior installation sites for FACTS and the PSO algorithm, the optimized configuration of FACTS under the condition of the large DC transmission of power is obtained. The installment locations and capacity parameters of UPFC, TCSC and STATCOM are provided as a reference for the decision maker of FACTS’s investment and construction.