| Since entering the 21st century, national power grids have been growing, with wind power, photovoltaic power generation, represented by clean energy generation permeability increasing growing structural complexity of large interconnected power grid, grid reliability, stability and power quality constantly under attack, the safe and stable operation of power system faces great challenges, the transient stability of power systems has become an acute problem. Energy storage technology to improve transient stability of power systems provide new opportunities. Electrochemical batteries and other energy storage power with fast and precise power tracking ability, able to provide instantaneous power and short-time power support, active and reactive power comprehensive regulation to make it an effective means of improving power system transient stability. Based on electrochemical battery storage to improve transient stability of power system selection and transient stability evaluation, control strategies, modeling and application study of transient.Firstly, for comparative analysis of existing problems in transient stability control of accumulator power advantage. From the technical indices and economic indicators two aspects of selection index system of comprehensive evaluation on applicability; Using the principles of subjective weighting method, the weight distribution on the technical index and economic index; Comprehensive evaluation of selection of various types of energy storage power, elected according to the evaluation results apply to storage of transient stability power supply type.Secondly, based on branch temporarily situation can function, proposed has a based on unit unit relative temporarily situation can of power system temporarily State work angle stable discriminant assessment method, defined has unit unit temporarily State stability discriminant index and generator temporarily State stable degrees index, through NEW-ENGLAND 10 machine 39 node system simulation validation the method can fast, and accurate of discriminant system of temporarily State work angle stability and lost stability grouping mode. For single machine infinite bus system with a storage battery, theoretically the storage battery mechanism of improving the stability of the system; Analysis of storage battery the effect of different connection positions, come to the storage battery on the generator side effects better conclusions.Finally, the study on the storage battery control strategies and modeling and application of transient effects.Using equal area criterion and branch transient potential energy function, based on critical branch is proposed temporary state control of energy storage battery control, and storage battery power control signal is extracted. Deficiency of dynamic modeling for storage batteries constructed considering storage battery body and Inverter control system, integrated storage battery of grid control model and simulation model is established in PSASP. Using single machine infinite bus system simulation of storage battery control and transient model of validity and applicability, and compare it with the storage battery into position and effect of different power limits. By NEW-ENGLAND 10 machine 39 node system simulation, comparative analysis of storage battery set configuration and dispersion effects, dispersion configuration obtained better results. |
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