CAJ | 학술논문

利用电压空间矢量对Z源光伏并网逆变器线电流进行定时滞环控制,以控制误差为0且开关频率固定为目标,设计了定时滞环控制器,实现了并网电流与电网电压同步,获得了较高的功率因数。同时,零矢量在每个控制周期开始时刻作用,通过计算零矢量作用时间可能的最小值,计算得到占空比并成功插入直通时间实现了直流升压。所提出的系统及方案具有响应快速、精度高、抗干扰能力强、开关次数少、易于数字化实现等优点。仿真和试验结果均验证了该控制策略的正确性。
이용전압공간시량대Z원광복병망역변기선전류진행정시체배공제,이공제오차위0차개관빈솔고정위목표,설계료정시체배공제기,실현료병망전류여전망전압동보,획득료교고적공솔인수。동시,령시량재매개공제주기개시시각작용,통과계산령시량작용시간가능적최소치,계산득도점공비병성공삽입직통시간실현료직류승압。소제출적계통급방안구유향응쾌속、정도고、항간우능력강、개관차수소、역우수자화실현등우점。방진화시험결과균험증료해공제책략적정학성。
A voltage space vector based regular-time hysteresis current control scheme for the photovoltaic grid connection system with Z source inverter is presented.The regular-time hysteresis current control has been designed to realize the zero control error and fixed switching frequency.It also achieved high power factors,which indicated the synchronization between the inverter output current and the grid voltage.Meanwhile,the zero space vector acts at the beginning of each control interval.By calculating the minimal duration possible for the zero space vector,the duty ratio can be obtained.The corresponding shoot-through duration is added to the minimal duration to boost the DC side voltage successfully.The system and control scheme proposed offer the advantages of fast response,high accuracy,high immunity of perturbations,low switching actions,and easy implementation.Both simulation and experiments have verified the correctness of the method.