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Featuring high efficiency, low harmonic distortion, high modularity and scalability, the modular multilevel converter (MMC) is particularly suitable for high voltage direct current transmission applications. As an advanced control strategy, model predictive control (MPC) has the advantage of direct modeling and fast dynamic response. It can simultaneously control multiple variables through an appropriate...
Due to the demand for increasing the reliability and efficiency of Shunt Active Power Filter (SAPF), this paper proposes a novel fault-tolerant control scheme for SAPF. When phase failure occurs, the inverter topology can be reconfigured from three-phase six-switch structure into three-phase four-switch which is achieved by connecting the endpoint of fault phase to the midpoint of DC-bus. On this...
In order to increase the reliability and efficiency of Shunt Active Power Filter (SAPF), this paper proposes a novel fault-tolerant topology which can reconfigure the inverter circuit in fault condition. Redundancy operation is achieved by connecting the endpoint of fault phase to the midpoint of DC-bus. On this basis, working principle of fault-tolerant SAPF is analyzed and a control strategy which...
Distribution STATic synchronous COMpensator (DSTATCOM) has been proved an effective approach to compensate reactive and harmonic current in distribution network. However, DC-link voltages of H-bridge cascaded DSTATCOM contain 100Hz (double grid frequency) voltage harmonics due to reactive compensation current, these harmonics will also exist in the output of DC-link voltage balancing controller which...
The fundamental building block of cascaded static synchronous compensator used in distribution grid is H-bridge based converter module. In this paper a type of "plug and play" module was introduced to improve the device compensation performance and reliability. The module based on IGBT parallel connection was discussed about the design of electrical parameters and physical structure. In...
The full-bridge convertor is able to perform as the basic electrical circuit elements in its AC side with proper control. Negative inductor which is not exist in the real world is helpful to decrease the power line impedance without the possibility of resonance like the capacitor. Three different active inductor implementation methods are reviewed and compared, based on the features of the distributed...
In order to reduce the current of each IGBT and reduce the harmonic current into the grid, a multiple AC-DC-AC full-scale converter which is suitable for high power direct drive wind power generation systems is adopted. The reasons of DC-link voltage fluctuation of the grid connected converter are analyzed. An improved DC-link voltage control method for multiple grid connected converter in direct...
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