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The single-stage photovoltaic grid-connected system uses only once energy conversion to complete two functions: Maximum power point tracking (MPPT)and grid connected, so it has a large advantage of cost and efficiency. This paper research the Single Stage Three-phase Grid-connected Photovoltaic Inverter. Against the slow response of the DC bus voltage for the control of the traditional double-loop,...
Application of single-cycle control of the inverter can enhance the inverter DC input immunity. Controling auxiliary voltage and current outer loop in a single cycle, the load capacity of a single-cycle control can be improved. In this paper, for single-phase voltage-type high frequency link matrix inverter, we study a new multi-loop SPWM control strategy based on single-cycle inner control. Simulation...
Quasi-Z-source inverter (QZSI) can boost and buck the input voltage with only once power transformation. It is suitable for the grid-connected photovoltaic (PV) system with the wide variation of PV cells output. The composite control for PV grid-connected and energy-storage based on Quasi-Z-source inverter is researched in this paper. The energy balance between the pre-stage circuit and the post-stage...
For the operation of autonomous microgrids, it is a major task to share the load demand economically. This paper proposes an economic operation method of microgrid for feeder power-flow optimization, taking into consideration the generation costs of the micro-sources and power loss in the transmission line. A detailed analysis of the cost-based nonlinear droop control scheme of micro-source inverter...
Grid impedance estimation is crucial for operating and controlling of grid-connected converters, especially with the high penetration of renewable energy sources into microgrid and smart grid. One of the technical challenges is how to fast and accurately estimate the grid impedance, even under the distorted and unbalanced conditions. Many impedance estimation methods have been presented in the past...
Power flow control is one of the most important issues for operating the inverter-dominated autonomous microgrid. A technical challenge is how to achieve the accurate active/reactive power sharing of inverters. P-F and Q-V droop control schemes have been widely used for power sharing in the past decades. But it suffers from the poor power sharing in the presence of unequal line impedance. In order...
Grid impedance is one of the most important parameters for operating and controlling of grid-connected converters, especially with the high penetration of renewable energy sources into microgrid and smart grid. One of the technical challenges is how to fast and accurately estimate the grid impedance, even under the distorted and unbalanced conditions. Many impedance estimation methods have been presented...
In this paper, high voltage and high frequency Capacitor Charging Power Supply based on serial resonant topology is analyzed. Considering the nonlinear and parasitic parameters, the charging current is a decay one. A 700W experiment prototype is completed based on DSP digital control. Experiment waveforms verify the charger operating with a output current of 1A and charging the 47μF capacitor to a...
As the high frequency link (HFL) SPWM inverter possesses highly nonlinear property and variable parameters due to its special structure, the perfect control can not be obtained with conventional control methods especially under nonlinear load. A self-adaptive fuzzy control scheme in this paper is proposed for a single-phase high frequency isolated DC\AC\AC inverter, in which a novel assistant fuzzy...
Inverter system, as the interface device between the renewable energy system and grid, plays an important role in the distributed generation system. A double-mode single-phase inverter system, which can be operated in grid-connected mode or stand-alone mode with seamless transitions control, is proposed in this paper. The different control strategies applied on the system for the different modes are...
As the high frequency link (HFL) SPWM inverter possesses highly nonlinear property and variable parameters due to its special structure, the perfect control can not be obtained with conventional control methods especially under nonlinear load. A self-adaptive fuzzy control scheme in this paper is proposed for a single-phase high frequency isolated DC\AC\AC inverter, in which a novel assistant fuzzy...
Inverter system, as the interface device between the renewable energy system and grid, plays an important role in the distributed generation system. A double-mode single-phase inverter system, which can be operated in grid-connected mode or stand-alone mode with seamless transitions control, is proposed in this paper. The different control strategies applied on the system for the different modes are...
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