摘要
基于对系统功率出力平滑控制的控制研究,结合光能、化学能和电能的优点提出了一种多能互补新能源电站的协调控制策略,采用MPPT控制光伏发电系统,通过控制双向DC-DC逆变器实现蓄电池、超级电容器和氢燃料电池充放电,保证了直流母线电压的稳定。利用蓄电池和超级电容器能量互补特点,通过对电容两端电压的前馈闭环来削弱由负载电流变化引起系统闭环极点改变的影响,实现对储能系统的优化管理。建立多能互补协调控制系统的仿真模型,仿真结果表明,该系统可以解决因光伏功率和负载变化而导致电网电压波动的问题,减少光伏电站因减少功率波动造成的主动削减不可恢复的功率,避免了一定的能量损失,增加了可再生能源运行柔性和经济上的效益最大化。
This paper proposes a coordinated control strategy for multi-energy complementary new energy power plants by studying the control of system power output smoothing control and combining the advantages of light energy,chemical energy and electric energy.This paper firstly uses MPPT to control the photovoltaic power generation system.By controlling the bidirectional DC-DC inverter,the battery,supercapacitor and hydrogen fuel cell are charged and discharged,and the DC bus voltage is stabilized.Then use the complementary characteristics of the energy of the battery and the supercapacitor,wherein the battery is used to store and output the low frequency power,the supercapacitor provides the high frequency deviation power through the current hysteresis control,and the load is weakened by the feedforward closed loop of the voltage across the capacitor.The current change causes the influence of the closed-loop pole change of the system to realize the optimal management of the energy storage system.Finally,the simulation model of multi-energy complementary coordinated control system is established.The simulation results show that the system can solve the problem of grid voltage fluctuation caused by photovoltaic power and load change,and reduce the active reduction of photovoltaic power station due to the reduction of power fluctuation.Power,avoiding certain energy losses,increases the flexibility of renewable energy operation and maximizes economic benefits.
作者
胡津源
王书征
HU Jin-yuan;WANG Shu-zheng(Jiangsu Xutang Power Generation Co.,Ltd,Xuzhou 221300,China;School of Electric Power Engineering,Nanjing Institute of Technology,Nanjing 211167,China)
出处
《电工电气》
2020年第9期28-32,共5页
Electrotechnics Electric
关键词
多能互补
光伏发电
出力平滑
multi-energy complementary
photovoltaic power generation
output smoothing
