支撑电网黑启动的风光储新能源电站协调控制策略

针对局部风光资源丰富地区大停电黑启动的方案,首先建立了风光储新能源电站黑启动控制模型,研究其支撑电网黑启动的过程,储能系统作为主电源保证黑启动过程中系统电压和频率稳定。其次,提出了一种风光机组负荷跟踪功率协调控制策略,当风光出力不足时,风光机组采用最大功率跟踪(maximum power point tracking,MPPT)算法,储能系统作为主电源负责微电网功率的平衡;当风光出力足够时,风机根据光伏出力的变化进行减载运行,有效跟踪负荷功率变化,减少储能充电功率。该控制策略不但可减少储能系统充放电转换次数提高储能系统使用寿命,还能大大降低黑启动中储能系统配置容量,提高经济效益。最后,基于DIgSILENT/PowerFactory仿真平台搭建了风光储新能源电站控制模型,仿真验证了风光储新能源电站作为电网黑启动电源的可行性和所提控制策略的有效性。

Coordinated Control Strategy of Wind-Solar-Storage Power StationSupporting Black Start of Power Grid

Aiming at the black-start scheme of blackouts in areas with abundant wind and solar resources, this paper firstly establishes a black-start control model for wind-solar-storage power stations to study the process of supporting the black-start of the power grid. The energy storage system is used as the main power source to ensure the system voltage and frequency stable. Secondly, a coordinated control strategy for load tracking power of wind-solar units is proposed. When wind-solar power output is insufficient, wind-solar power unit adopts maximum power point tracking (MPPT) algorithm, and the energy storage system acts as the main power source to balance the power of microgrid. When wind-solar output is sufficient, wind-solar units effectively track load power changes to avoid excessive power charging to energy storage. This control strategy can not only reduce the times of charge-discharge conversion of the energy storage system, but also greatly reduce the configuration capacity of the energy storage system in black start, which can provide economic benefits. Finally, on the DIgSILENT/PowerFactory simulation platform, a control model for wind-solar-storage power station is built, and the simulation verifies the feasibility of wind-solar-storage power supply as power grid black-start source and the effectiveness of the control strategy proposed in this paper.