Operation analysis of high efficiency grid connected bi-directional power conversion system for various storage battery systems with bi-directional switch circuit topology
In recent years, there is an increasing demand for various types of storage battery systems, such as home battery systems, V2H(Vehicle-to-Home)/V2G(Vehicle-to-Grid) systems, and UPS systems. Performance requirements for the power conversion system within these storage battery systems are small size, light weight and high efficiency. We propose a new power conversion system so called the GAP-D3 converter that is a bi-directional power control system, comprising of a bi-directional switch circuit topology with natural commutation switching mode. This paper describes the features of GAP-D3 converter including this new current compensation control with simulation and experimental results.
A coordinated control strategy for suppressing transient power fluctuation of power conversion system and stabilizing AC bus voltage
The PV / Storage microgrid (MG) is one of the main forms of effectively use of Solar energy. Energy storage based power conversion system (PCS) is responsible for maintaining the power balance and voltage / frequency in the islanded MG. However, the power input or output of PCS and the instantaneous stress of the converter current will be increased greatly when the load is suddenly changed, which may result in the PCS over current fault and power imbalance, and the bus voltage and frequency oscillation of MG, will threaten the system stability. In this paper, a coordinated control strategy for PCS and photovoltaic (PV) inverter based islanded hybrid MG is proposed to suppress the transient power fluctuation of PCS and stabilize the AC bus voltage. The differentials of active power output of PCS is calculated and used to compensate the d-axis current of PV inverter. In this way, the PV system is controlled to change the power output with PCS simultaneously, so as to achieve the purpose of suppressing PCS transient power fluctuations and stabilizing the AC bus transient voltage. The hybrid MG is simulated by MATLAB / Simulink, the effectiveness of the coordinated control strategy is verified by simulation results based on different scenarios.
30.5 A GaN 3×3 matrix converter chipset with Drive-by-Microwave technologies
In this paper, we describe a GaN 3x3 matrix converter chipset, which are composed of a GaN integrated bidirectional switching chip and a GaN integrated gate drive transmitter chip using 5.0GHz Drive-by-Microwave technology. The extremely compact three phase AC-AC matrix converter such as a 25x18mm2 is realized by these GaN/Si integrated chips and novel isolated dividing couplers, which duplicate the gate signal with different references for dual-gate bidirectional switches and reduce gate lines and gate drive components by half. The proposed GaN 3x3 matrix converter is significantly more compact than the conventional one that requires numerous power switches, flywheel diodes, photo-couplers, isolated power supplies and gate drivers.