CAJ | 학술논문

微电网由并网运行模式到孤岛运行模式的平滑切换是保证微电网区域内重要负荷持续可靠供电的重要手段。文中利用MATLAB/Simulink仿真软件建立了逆变器微源类型的微电网模型,实现了微电网并网及孤岛2种运行模式及其相应的控制方法。在推导控制器系统传递函数的基础上,分析了控制参数对系统频谱特性的影响,并通过时域仿真研究了控制参数对微电网运行模式切换暂态过程的影响规律,在此基础上提出了基于控制器状态跟随的微电网平滑切换控制方法。同时,从微电源容量与微电网内负荷匹配程度的角度,提出了3区域平滑切换控制策略,有效地减小了微电网2种运行模式切换过程中的暂态振荡。通过仿真验证了所提出的平滑切换控制方法及策略的有效性。
미전망유병망운행모식도고도운행모식적평활절환시보증미전망구역내중요부하지속가고공전적중요수단。문중이용MATLAB/Simulink방진연건건립료역변기미원류형적미전망모형,실현료미전망병망급고도2충운행모식급기상응적공제방법。재추도공제기계통전체함수적기출상,분석료공제삼수대계통빈보특성적영향,병통과시역방진연구료공제삼수대미전망운행모식절환잠태과정적영향규률,재차기출상제출료기우공제기상태근수적미전망평활절환공제방법。동시,종미전원용량여미전망내부하필배정도적각도,제출료3구역평활절환공제책략,유효지감소료미전망2충운행모식절환과정중적잠태진탕。통과방진험증료소제출적평활절환공제방법급책략적유효성。
Smooth switchover of microgrid from grid-connected operation mode to islanded operation mode can guarantee the continuous power supply to important loads.A microgrid model for inverter source is established with MATLAB/Simulink software,which realizes both grid-connected and islanded operation modes of microgrid and their control methods.Then the impacts of control parameters on the spectrum characteristics are analyzed based on the transfer function of controller system.And through time-domain simulation,impact of control parameters on transient process of microgrid operation mode switchover are investigated.According to the analysis above,a microgrid smooth switchover control method based on controller status follow is presented.In the meantime,as viewed from the micro-source capacity matching with load,the three-region smooth switchover control strategies are proposed to effectively reduce the transient oscillations in switchover process of microgrid two operation mode.Finally,the simulation results show the effectiveness of the proposed smooth switchover method and strategies.