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This paper presents a DC bus voltage balancing control method for the grid-connected hybrid cascaded converter with renewable energy sources. The proposed control method is based on the power flow management in the hybrid cascaded converter, which is investigated in this paper, and is thus capable of overcoming the unbalanced conditions arising at DC-side or AC-side. Laboratory test results under...
There are two unbalanced conditions for cascaded converter in Renewable Energy Source (RES) system. One is from the different output power of RES in bridge cells, and the other is grid voltage unbalanced fault. This paper presents a flexible voltage control technique of Modular Multilevel Cascaded Converter with single-delta bridge cells (MMCC-SDBC) in the RES system for maintaining the stable operation...
The modular multilevel cascaded converter with single-star bridge-cell (MMCC-SSBC) is very suitable for next generation high-scale renewable energy resource system for the low switching loss, low output current distortion, and high reliability. The voltage balancing control is an important issue for MMCC-SSBC to maintain system operation which can be accomplished by negative sequence current and/or...
Real-time Hardware-in-the-Loop (HIL) simulation is an effective technique to include complexity of the micro-grid under control in the testing real-time embedded system. In this paper, we will report recent progresses of real-time simulations of a laboratory-scale micro-grid system in Taiwan. We use the OPAL-RT platform for real-time simulations and HIL control tests. In particular, the following...
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