基于分布式光伏/飞轮储能联合发电系统的并网点电压 主动调控技术研究

为改善配电网末端电能质量,提高并网点电压稳定性,提出了一种基于分布式光伏/飞轮储能联合发电系统的并网点电压主动支撑控制策略。相比于传统电压调节控制方式,该控制策略能够充分发挥飞轮储能高频次充放电特性,根据电压偏差大小自适应调整联合发电系统有功/无功输出,稳定并网点电压。同时该控制策略将并网点功率因数作为考虑因素,引入控制算法当中,能够在进行功率控制的同时优化并网点功率因数。为验证所提控制策略的可行性,搭建了一套含50 kW光伏、100 kW飞轮储能在内的实验测试平台。实验结果表明分布式光伏/飞轮储能系统能够根据电压波动大小自动调整有功/无功输出,改善并网点电能质量。

Research on the active control technology of grid voltage based on a distributed photovoltaic/flywheel energy storage combined generation system

In order to improve the power quality at the end of a distribution network and enhance the voltage stability of the parallel grid,this paper proposes an active voltage support control strategy based on a distributed photovoltaic/flywheel energy storage combined generation system.Compared with the traditional voltage regulation control method,the control strategy can give full play to the high frequency charging and discharging characteristics of flywheel energy storage,adjust the active/reactive power output of the combined generation system adaptively according to the magnitude of voltage deviation,and stabilize the grid point voltage.At the same time,the control strategy takes the power factor of the grid point as a consideration,and introduces a control algorithm,which can be used in the same power control.The power factor of the parallel dot is optimized.In order to verify the feasibility of the proposed control strategy,a set of experimental test platforms including 50 kW photovoltaic and 100 kW flywheel energy storage is built.The experimental results show that the distributed photovoltaic/flywheel energy storage system can automatically adjust the active/reactive power output according to the voltage fluctuation,and improve the power quality of parallel outlets.