当电网出现有功缺额并导致频率跌落时,风电机组可以通过释放自身轴系动能为电网提供短时频率支撑(short-term frequency support,STFS).如何利用有限的风电机组轴系动能最大限度地支撑电网频率,是当前研究的热点问题.针对风电机组可释放动能和电网频率变化率约束下的电网最大频率偏差最小化问题,该文提出一种基于有功功率互补控制(active-power complementation control,ACC)的风电机组STFS策略,揭示STFS过程中风电机组的最小动能释放机理,并证明采用ACC释放全部轴系动能的STFS策略为上述问题的最优解.最后,基于含风电的电网动模实验平台的实验结果验证该文提出STFS策略的可行性与频率支撑效果.
Maximum-frequency-deviation-oriented Optimal Short-term Frequency Support Strategy of Wind Turbines and the Mechanism
When severe active power deficiency occurs and leads to a frequency drop in the power grid,wind turbines can provide short-term frequency support(STFS)by releasing their shaft kinetic energy.A major concern is how to make the best of the limited shaft kinetic energy to support grid frequency.Aiming at minimizing the maximum frequency deviation under the constraints of the releasable kinetic energy and the rate of change of frequency,this paper proposes an STFS strategy for wind turbines based on active-power complementation control(ACC),which reveals the minimum kinetic energy release mechanism during STFS.Furthermore,the STFS strategy that releases the total kinetic energy using ACC is proved to be an optimal solution to the above problem.Finally,the experimental results based on a wind power-integrated power system test bench verify the feasibility and frequency support effect of the proposed STFS strategy.
wind turbinesprimary frequency regulationshort-term frequency supportshaft kinetic energyactive-power complementation control
万方数据
维普
