Evaluation Of Reserve Capacity Of Power Grid Including Large-scale Wind Farms

Due to random fluctuation characteristics of wind speed and the volatility of the output power of the wind turbine, increasing the uncertainty of the wind power system and new method is needed to confirm the required reserve capacity. In China, majority wind resources are far away from the load centers. In this regional, the wind power cannot be consumed completely, wind power should adopt wind &coal-combined transmission mode that influences the reserve capacity. Therefore, it is necessary to study the size of the reserve capacity and influencing factors for power grid including large-scale wind farms.Under the premise of chance constrained programming thesis builds a reserve dispatching model in power market, considering the randomness and the temporality of wind speed, and puts the reliability level and the price of reserve into the inequality constraint conditions and objective function. The built model is solved by Simulated Annealing-Particle Swarm Optimization. Based on the results from calculation example, thesis confirms the reserve capacity for power grid including large-scale wind farms and evaluates the impacts of difficult reliability levels, failure outage rate, the price of reserve, wind farm capacity and location on the optimization results. For wind &coal-combined transmission mode, taking the UHV DC channel in Inner Mongolia as an example. Based on the analysis of the output characteristics in the sending of wind power and the load characteristics in the end, thesis builds the model of wind &coal-combined transmission system. The built model is solved by Simulated Annealing-Particle Swarm Optimization. Then thesis estimates the influence of the system reserve capacity by the wind fire baling proportion and obtains the best proportion of wind &coal-combined transmission system in Inner Mongolia.The results show:(1) Units’ failure outage rate, cost of reserve, wind power capacity and wind speed fluctuation can affect the reserve capacity.(2) Not only improve the penetration of wind, also can reduce the requirement of reserve capacity by wind &coal-combined transmission mode.