Research on optimization of generation cutting strategies for thermal and wind generations building energy bases

摘要

In response to the worsening of the environment caused by large consumption of fossil energy，rnthe development and utilization of renewable energy has been the focus of people's attention. As anrnimportant form of renewable energy, the electricity generated by the wind has received more and morernattention. Due to the highly concentration of wind power resources in some remote areas and the lowerrnlocal load consumption level，the large-scale wind power must be transmitted to distant load centersrnthrough the main grid in China State Grid，which is markedly different to the other countries. In orderrnto reduce the unpredictable volatility and enhance the using efficiency of wind power，the largerncapacity thermal and wind generations bundling energy bases are built and operated. So, some newrnsecurity and stability problems occurs. Under some severe fault circumstances ， only thermalrngeneration tripping cannot guarantee the power system to restore stable or cost excessively.rnThis paper presents a prescription for the optimal proportion strategies of thermal and windrngenerations in security and stability control measures, which can minimize the cutting capacity ofrnthermal and wind generations and maximize the economic benefits. First, the difference of transientrncharacteristics between wind turbine generator and conventional thermal generator is studied torndistinguish their respective impacts on accelerating power of sending power system. Second, transientrnstability performance of Wind and Thermal Bundling System is analized to ensure that the impact onrnstability of large scale wind generator don’t been ignored. Third, optimization strategies and programsrnof thermal and wind generator tripping based on transient energy function in shown, and it canrnestimate the stability of thermal and wind generation bundling energy base and single thermalrngeneration to decide the tripping capacity of thermal generator; meanwhile the transfer capacity of tiernlines after faults is calculated to decide the tripping capacity of wind generator which is drasticallyrnreduced by faults.Finally, the results based on real thermal and wind generation bundling energy basernof Northwest China Grid show that the optimization strategies can significantly reduce the trippingrnamounts that guarantee the power system to restore stability, improving recovery characteristic afterrnsevere fault, greatly increasing the safety and economy of the thermal and wind generation bundlingrnenergy base.