计及备用容量及考虑禁止区间的含风-蓄电力系统经济调度

Economic Dispatch on Power Systems With Wind Power and Pumped-Storage Station Considering Prohibited Zones Under Influence of Reserve Capacity

风电出力具有随机性和反调峰性,接入电网后会对其稳定运行产生负面影响。抽水蓄能电站能够依据负荷需求储存多余风能或释放电能,平抑风电出力波动,减少弃风量。由于火电厂组件的物理限制,发电机在其运行区间的某些范围内会使轴承振动放大。因此应该在含风-蓄系统的电力系统经济调度模型中,设置火电机组出力的禁止区间。通过最小日负荷率和备用容量率对给定的负荷等级进行划分,确定抽水蓄能电站的运行状态;建立解决风-蓄系统接入含禁止区间电力系统的经济调度问题的0-1混合整数非线性规划模型,该模型中设置含有禁止区间的备用容量约束,采用matlab编写BNB20函数对6火电机组、1风场和1抽水蓄电站系统进行仿真,研究禁止区间和备用容量对经济调度的影响,仿真结果证明了该方法行之有效。

Wind power integration generally imposes negative impact on stable operation of power grid because of wind power ＇s randomness and counter peak-shaving characteristics. Pumped-storage station can store excess wind power or discharge power to meet load demand. Intermittence of wind power can be regulated with system reserve, thus reducing wind power curtailment. Due to physical limitation of power plant components, bearing vibration may be amplified at certain operation regimes, harmful to power plant. So prohibited zones for thermal power plant should be considered when studying power system economic dispatch. In this paper, a load level based on minimum daily load rate and reserve capacity rate is presented. Then operation states of the pumped-storage station are classified. A mixed integer non-liner programming（MINLP） model solving economic dispatch problem for power systems with wind farm and pumped-storage stations is presented with constraints of reserve capacity and prohibited zones taken into account. Finally, the model presented above is simulated with a system with 6 units, 1 wind farm and 1 pumped-storage station to investigate influence on economic dispatch of power system with prohibited zones and reserve capacity. Validity of the method is verified with the simulation. 1