Research Of Short-term Operation Optimization Of Power System With Large-scale Renewable Generation

Recent years, motivated by the national subsidies and costs decline, the growth ofwind power generation and photovoltaic generation has been huge in China. As windpower generation and photovoltaic generation have the characteristics of fluctuations andintermittence, they can’t be dispatched in traditional methods. With large-scale windpower generation and photovoltaic connected to the power system, dispatch of powersystem becomes more complex and uncertain, and their uncontrollable outputs will lead toaccidents such as load shedding and wind energy spillage. This not only affects theeconomic and reliable operation of the power system, but also affects the consumptivescale of renewable energy. This warrants the improvement of short-term power systemoperation planning methods which are capable of better coping with the nature of windpower generation and photovoltaic generation.Based on the existing literature and research achievement，this paper first analyzedcharacteristics of wind power generation and photovoltaic generation and had a review ofshort-term output modeling methods. To deal with the random nature and the low forecastaccuracy of wind power generation and photovoltaic generation, a novel dynamiceconomic dispatch optimization model, based on chance-constrained programming, wasproposed. Considering the difference of output characteristics, corresponding economicdispatch models were established from two aspects which were large-scale wind powerintegrated in power system and large-scale photovoltaic generation integrated in powersystem. In order to adapt to the randomness of wind power generation and photovoltaicgeneration, risk reserve constraint based on confidence level was introduced, and thereliability, economy and utilization of wind power were considered in the objectivefunction.The case studies were carried out on IEEE RTS-96test system. The results showedthat the proposed model could better solve the contradiction between economic efficiencyand reliability, and better accommodate to the request of maximizing the profit of grid company under market environment. The test results demonstrated the validity of theproposed model.