电网技术
電網技術
전망기술
POWER SYSTEM TECHNOLOGY
2013年
10期
2778-2787
,共10页
电压空间矢量脉宽调制%最小脉宽%约束%合成误差%总谐波失真
電壓空間矢量脈寬調製%最小脈寬%約束%閤成誤差%總諧波失真
전압공간시량맥관조제%최소맥관%약속%합성오차%총해파실진
space vector pulse width modulation%minimum pulse-width%constraint%synthesis error%total harmonic distortion
为解决传统调制方法中的最小脉宽问题，提出了一种带约束的电压空间矢量脉宽调制(space vector pulse width modulation，SVPWM)方法。首先，建立新的三相桥臂坐标，取消了扇区的划分和判断；其次，将基本电压空间矢量由8个减小为3个，并将其作用时间与三相桥臂的导通时间一一对应；再次，通过增加约束条件，将传统 SVPWM 方法的调制过程及其结果离散化，从而避免了窄脉宽的出现；最后，给出了一种快速的计算策略，其计算量仅与 SVPWM方法一个扇区的计算量基本相同。相对于 SVPWM 方法，所提方法调制的基波与杂波在频谱上的分布更清晰，低次谐波较少，有利于进行低通滤波处理，更适合较高电压和较大电流的逆变要求。仿真及实验结果均验证了该方法的可行性。
為解決傳統調製方法中的最小脈寬問題，提齣瞭一種帶約束的電壓空間矢量脈寬調製(space vector pulse width modulation，SVPWM)方法。首先，建立新的三相橋臂坐標，取消瞭扇區的劃分和判斷；其次，將基本電壓空間矢量由8箇減小為3箇，併將其作用時間與三相橋臂的導通時間一一對應；再次，通過增加約束條件，將傳統 SVPWM 方法的調製過程及其結果離散化，從而避免瞭窄脈寬的齣現；最後，給齣瞭一種快速的計算策略，其計算量僅與 SVPWM方法一箇扇區的計算量基本相同。相對于 SVPWM 方法，所提方法調製的基波與雜波在頻譜上的分佈更清晰，低次諧波較少，有利于進行低通濾波處理，更適閤較高電壓和較大電流的逆變要求。倣真及實驗結果均驗證瞭該方法的可行性。
위해결전통조제방법중적최소맥관문제，제출료일충대약속적전압공간시량맥관조제(space vector pulse width modulation，SVPWM)방법。수선，건립신적삼상교비좌표，취소료선구적화분화판단；기차，장기본전압공간시량유8개감소위3개，병장기작용시간여삼상교비적도통시간일일대응；재차，통과증가약속조건，장전통 SVPWM 방법적조제과정급기결과리산화，종이피면료착맥관적출현；최후，급출료일충쾌속적계산책략，기계산량부여 SVPWM방법일개선구적계산량기본상동。상대우 SVPWM 방법，소제방법조제적기파여잡파재빈보상적분포경청석，저차해파교소，유리우진행저통려파처리，경괄합교고전압화교대전류적역변요구。방진급실험결과균험증료해방법적가행성。
To solve the problem of the minimum pulse width in traditional modulation methods, a space vector pulse width modulation (SVPWM) method with constraints is proposed. Firstly, a three-phase bridge-arm coordinate is established to cancel the traditional sector division and the judgment;secondly, the number of basic voltage space vectors is reduced from 8 to 3, and their actuation durations correspond to the on-times of three-phase bridge-arms respectively;thirdly, by means of adding constraint conditions the modulation process of traditional SVPWM and modulation results are discretized to prevent the appearance of narrow pulse width;finally a fast computational strategy is given and its calculated amount is basically same as to the calculated amount for one sector by SVPWM method. Relative to SVPWM method, the distribution of the fundamental wave and clutters modulated by the proposed method on the frequency spectrum is more clear and there are less low-order harmonics, so it is favorable to implement low-pass filtering, thus the proposed method is more suitable for PV inverters with higher voltage and larger current. The feasibility of the proposed method is verified by results of simulation and experiments.
