间歇式能源发电系统无功补偿技术的研究

针对间歇式能源发电系统的特点和无功需求,提出了将无功补偿与风力并网发电相结合的设计方案,通过计算得出了间歇式能源发电系统中电缆和变压器无功损耗.本文利用Mat-lab/Simulink搭建了具有无功补偿功能的并网变流器的仿真模型,并采用有功无功解耦控制和SPWM控制方法,补偿系统所需无功以及有效抑制动态电压波动.最后,仿真结果验证了风力并网变流器在向电网提供有功功率的同时也能够提供一定容量的无功功率,提高系统功率因数,有效抑制电网电压波动.

Reactive power compensation technology of intermittent energy generating system

According to the characteristics and reactive power demand of intermittent power generation system,this paper proposes a control scheme which combines wind power generation with reactive power compensation,making the wind power generation inverter providing active power to the grid,at the same time can also providing a certain capacity of reactive power,so as to simplify the system structure and improve the utilization ratio of equipment.It introduces the reactive power loss algorithm of cable and transformer in the intermittent power generation system,active/reactive power decoupling control of the wind power generation inverter and SPWM control method in detail.A grid-connected inverter with reactive power compensation has been designed by Matlab/Simulink,which can compensate the reactive power that the system requires and restrain dynamic voltage fluctuating effectively.Finally,the simulation results demonstrate the wind power grid-connected inverter can provide a certain capacity of reactive power when surporting active power to the grid,which have improved power factor of the system and restrained grid＇s voltage fluctuation effectively.