新能源并网功率智能控制系统的设计与应用

分析了当前新能源并网功率控制中仍存在的问题,介绍了新能源并网功率智能控制系统的功能设计与控制策略。提出新能源电站灵敏度在线计算方法。首先,根据新能源电站并网网络确定状态估计等效设备,再基于电网实时运行方式计算等效设备的灵敏度并转换为新能源电站灵敏度,据此确定参与断面控制的场站/机组及其功率调整量,解决了复杂断面结构下的风火协调控制问题。新能源参与调峰控制时,跟踪火电机组负备用并考虑机组调节速率,同时实时监视区域控制偏差,一旦出现异常则及时调整正在执行的指令,保障自动发电控制考核指标满足要求;综合新能源电站的发电能力、装机容量及电网接纳空间确定控制序列并动态更新,在最大化利用接纳空间的同时实现资源优先与兼顾公平的站间控制。结合山西电网实例,证明了系统在保障电网安全稳定运行、提升新能源消纳及促进新能源电站公平调度方面的有效性。

Design and Application of Intelligent Power Control System for Integration of Renewable Energy

Several existing problems in current power control of renewable energy are analyzed and the functional design and strategy of the intelligent control system for grid-connected power of renewable energy is introduced. The online sensitivity calculation method of the renewable energy station is proposed. Firstly, equivalent device in the state estimation system is confirmed according to grid-connected network of renewable energy power station. Based on real-time operation mode of the grid, the sensitivity of the equivalent device is calculated and then converted into the sensitivity of renewable energy station. The station/unit participating in the section control and the quantity of adjusted power is determined, and the problem of wind-coal coordinating control under the complex network structure is solved. When the renewable energy participates in peak regulation by tracking the negative spare capacity considering the regulation rate of thermal power unit and the area control error, the executed instructions would be adjusted in time once an exception occurs to ensure that automatic generation control(AGC)assessment indicators could meet the requirements. According to the power generation capacity, installed capacity and grid receiving space of the integrated renewable energy power station, the control sequence is determined and updated dynamically. The strategy can realize resource priority and fairness control among renewable energy stations and ensure the maximized consumption of renewable energy power. The operation result in Shanxi power grid shows that the intelligent control system can guarantee effectiveness of ensuring safe and stable operation of power grids, improving new energy consumption and promoting fair dispatch of new energy power stations.