CAJ | 학술논문

为有效利用太阳能资源，光伏并网系统必须能够对光伏阵列的最大输出功率点进行跟踪。通过对现有的MPPT算法的分析比较，采用了一种结合恒压法的变步长电导增量法来实现最大功率点跟踪。并利用Matlab软件进行了仿真，仿真结果表明，前级Boost电路采用该算法能够快速实现MPPT，且对光强突变具有快速适应性；后级逆变电路采用双闭环控制，其能够使逆变器的输出快速、准确地跟踪电网电压的变化，并保持与电网电压同频、同相。该系统的输出电流纹波较小，接近正弦波，能够满足光伏逆变器并网的要求。
위유효이용태양능자원，광복병망계통필수능구대광복진렬적최대수출공솔점진행근종。통과대현유적MPPT산법적분석비교，채용료일충결합항압법적변보장전도증량법래실현최대공솔점근종。병이용Matlab연건진행료방진，방진결과표명，전급Boost전로채용해산법능구쾌속실현MPPT，차대광강돌변구유쾌속괄응성；후급역변전로채용쌍폐배공제，기능구사역변기적수출쾌속、준학지근종전망전압적변화，병보지여전망전압동빈、동상。해계통적수출전류문파교소，접근정현파，능구만족광복역변기병망적요구。
In order to effectively use solar energy resources, it is necessary for photovoltaic grid-connected system to track the maximum output power point of the photovoltaic array. Through analysis and comparison of the existing MPPT algorithm, a variable step size incremental conductance algorithm combining with constant voltage tracking method was proposed. The results of Matlab simulation show that the maximum power point tracking can be quickly achieved and the mutation of light intensity can be adopted by the former level boost circuit with the improved algorithm. Double closed loop control was adopted by after-level inverter circuit. The grid voltage changed and the frequency were fast and accurately tracked, and the inverter output current was phased. The grid and voltage were kept the same of those. The output current is close to the sine wave and with less ripples. This simulation proves that the PV grid-connected system is feasible in practice.