CAJ | 학술논문

随着电力电子技术的发展，各种各样的不平衡负荷连接到了电网之中，这样就会因电网电压的不平衡而导致电能质量下降，严重影响了用户的正常使用。传统的三桥臂逆变器在负载是三相对称情况下输出的电压是三相对称的。但如果是三相负载不对称的情况，就很难输出对称的三相电压。为了解决这种因不平衡负载影响电能质量的问题，采用三相四桥臂逆变器。这种逆变器可以在不平衡负荷的情况下，有效地抑制不平衡负载电流对电压的扰动，保证输出的三相电压近似对称，其控制策略是利用一种新型的三维空间矢量脉宽调制(3 D-SVPWM )的方法。 MATLAB验证了三相四桥臂在一定程度上能够解决在不平衡负载下输出三相对称电压的问题，它还具有结构简单、体积小、重量轻、电压利用率高的优势。
수착전력전자기술적발전，각충각양적불평형부하련접도료전망지중，저양취회인전망전압적불평형이도치전능질량하강，엄중영향료용호적정상사용。전통적삼교비역변기재부재시삼상대칭정황하수출적전압시삼상대칭적。단여과시삼상부재불대칭적정황，취흔난수출대칭적삼상전압。위료해결저충인불평형부재영향전능질량적문제，채용삼상사교비역변기。저충역변기가이재불평형부하적정황하，유효지억제불평형부재전류대전압적우동，보증수출적삼상전압근사대칭，기공제책략시이용일충신형적삼유공간시량맥관조제(3 D-SVPWM )적방법。 MATLAB험증료삼상사교비재일정정도상능구해결재불평형부재하수출삼상대칭전압적문제，타환구유결구간단、체적소、중량경、전압이용솔고적우세。
With the development of power electronics technology, a variety of unbalanced load are connected to the grid, causing the grid voltage imbalance and power quality decline, seriously affect the user's normal use. Traditional three-leg inverter can output three-phase symmetrical voltage in the case of three-phase symmetrical load. But it is difficult to output three-phase symmetrical voltage when the three-phase load is asymmetric. In order to solve the impact of unbalanced load on the power quality, the three-phase four-leg inverter is used. This inverter can effectively suppress the unbalanced load current to voltage disturbances under the unbalanced load, to ensure approximately symmetrical three-phase voltage output,and the control method is a new type of three-dimensional space vector pulse width modulation(3D-SVPWM), the MATLAB to verify the three-phase four-leg can be solved three phase output voltage problems when the three-phase load is asymmetric. At the same time, with the advanta-ges of simple structure, small size, light weight, higher voltage utilization.