A Sustainable Energy Penetration Limit Evaluation Method Considering Power System Frequency Security
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摘要: 提出一种考虑电力系统频率安全的新能源并网极限评估方法。该方法推导了可再生能源接入后的系统最大频率偏差表达式,并给出一种电网频率偏差极值点近似求解方法;基于近似结果评估了新能源装机容量变化的情况下,电网最大频率偏差随惯性及等效调节常数的变化情况。建立了频率安全约束模型,并以此作为新能源穿透极限的刚性约束。在2个测试系统上对近似模型进行了测试,并与仿真结果进行了比较。仿真结果表明,该方法所确定系统最大新能源穿透水平具有较高准确性,能够保证系统稳定性和可靠性。Abstract: A sustainable energy（new energy）penetration limit assessment method considering the frequency security of power system is proposed in this paper. In this method,the maximum frequency deviation expression of the system after renewable energy access is derived,and an approximate solution method for the extreme value point of power grid frequency deviation is given,and then based on the approximate results,the variation of the maximum frequency deviation of the power grid with changes of the inertia and the equivalent adjustment constant is evaluated under the capacity changes of new energy generating units. Furthermore,the frequency safety constraint model is established as the rigid constraint of sustainable energy penetration limit. Finally,the approximate model is tested on two test systems and the simulation results are compared. The simulation results show that the maximum new energy penetration level of the system as determined with the proposed method has high accuracy and can guarantee the stability and reliability of the system.
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