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The modular multilevel cascaded converter (MMCC) has been considered as a promising solution for integrating the utility-grade renewables to the medium-voltage (MV) power system. However, the implementation becomes difficult with the centralized control architecture as the cascaded numbers increase. This paper presents a distributed control technique for the cascaded converter, which significantly...
This paper investigates the effects of pulse width modulation (PWM) on the circulating current of parallel-connected four-pole inverters (FPIs). Detailed mathematical modeling shows that the common-mode voltage (CMV) outputs of PWMs are closely related to the circulating current, so this research presents the reduced CMV PWM techniques for FPIs to reduce the circulating current, and compares their...
Parallel-connected four-pole inverters (FPIs) becomes an important application in three-phase four-wire uninterrupted power system, owing to the benefits like high reliability, cost-effective and the convenient expansion of power capacity. Nevertheless, such parallel connection would lead to the side-effects, just as the circulating current, accompanied by extra loss and current distortion. The difference...
Connecting the four-pole inverters (FPIs) in parallel has many benefits, like lower cost, high flexibility and excellent reliability, and becomes a favorite option in industry. However, such side effects of parallel connection as the circulating current will lead to severe distortion and extra loss. The circulating current is mainly caused by the difference of common mode voltage (CMV) and closely...
The low-voltage ride-through (LVRT) capability has become one of the most important issues since more renewable and distributed energy resource are installed in the grid. The LVRT capability means the converter should remain grid-connected and inject required current to support gird voltage. On the other hand, the sudden reduction of grid voltage may result in magnetic flux deviation in the step-up...
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