| With the development of the new sources based on the photovoltaic and wind energy,research about the control method of the distributed-generations are paid more and more attention,with the advantage of “plug and play”,droop control method is widely applied in inverter which is belonging to the peer-to-peer control strategy.As the inverter in micro-grid could operates in both grid-connected and islanding mode,anti-islanding must be implemented into the inverter to prevent the harm caused by the loss of the grid.At present,the most of the islanding detection method which are designed for the current control inverter could not be applied into droop control inverter because of the failure of anti-islanding.To solve this issue,research on anti-islanding method which are applied to droop control inverter is carried out in this paper.At first,in this paper,the situation of the research on anti-islanding and the characteristic of the droop control are introduced,the NDZ of droop control is analyzed,and the condition of the power sharing between paralleled droop control inverter are shown.And then,a anti-islanding method based on phase disturbance is proposed,the disturbance and its influence are explained,and the detection theory is also introduced.The proposed anti-islanding method can not only realize the loss of the grid,but also have no influence on the islanding operation of the inverter.The effectiveness of the proposed method on paralleled inverters which operates on grid-connected mode is also analyzed.At last,simulations models of the both one inverter grid-connected operation and paralleled inverters grid-connected operation are established,simulating the proposed anti-islanding method in this paper.Experiment platform of inverter based on DSP2812 are also carried out,both single and paralleled inverter operating on grid-connected mode are experimented to verify the correctness and effectiveness of the proposed anti-islanding method. |
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