Photovoltaic inverter circuit capable of improving utilization rate of photovoltaic power generation system
A photovoltaic power generation system, photovoltaic inverter technology, applied in photovoltaic power generation, photovoltaic modules, electrical components and other directions, can solve the photovoltaic power generation system can not meet the requirements of grid connection, reduce equipment utilization, affect the service life of the system and other problems, achieve The effect of improving power quality, increasing utilization rate and reasonable structure
Active Publication Date: 2015-11-04
STATE GRID CORP OF CHINA +2
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Problems solved by technology
However, there is a significant disadvantage of photovoltaic grid-connected power generation, that is, when the light intensity is low or at night, the photovoltaic power generation system cannot meet the grid-connected requirements. At this time, the entire device must be shut down and disconnected from the grid. Such frequent start and stop actions will affect the system. service life, and greatly reduces the utilization of equipment
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[0012] A photovoltaic inverter circuit with a reactive power compensation function, the photovoltaic cell 1 is connected in parallel with a diode 2 and a voltage stabilizing capacitor 3, then passes through a three-phase fully-controlled bridge circuit 4, and then connects to the photovoltaic system through a filter inductor 5; The output side of the photovoltaic inverter is connected to the voltage detection device 6 and the current detection device on the output side. The voltage detection device is connected to the first abc dq coordinate converter 7, and the first abc dq coordinate converter outputs voltages Vd and Vq on the output side of the inverter. The output side current detection device is connected with the second abc dq coordinate converter 8; another inverter load side current detector is connected with the third abc dq coordinate converter 9; the voltage detection device is connected with the PLL phase-locked loop 10 , the PLL phase-locked loop is connected to th...
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The invention discloses a photovoltaic inverter circuit with a reactive compensation function. The circuit is characterized in that a photovoltaic battery is connected with a voltage stabilization capacitor in parallel through a diode and then is connected with a photovoltaic system through a three-phase fully controlled bridge circuit and a filter inductor. Reactive compensation on a power grid is achieved while photovoltaic grid-connected power generation is achieved. When the voltage of the photovoltaic grid-connected side is lower than that of the grid-connected point, certain reactive current is compensated to a power grid through the inverter, multifunctional use of the device is achieved, electric energy quality is improved, the whole system utilization rate is improved, repeated starting and stopping of grid-connected operation of a photovoltaic power generation device is avoided, and smooth transition is achieved.
Description
[0001] This application is a divisional application with application number 201410341259.2, application date 2014.7.18, and name "photovoltaic inverter circuit with reactive power compensation function". technical field [0002] The invention relates to a photovoltaic inverter circuit with reactive power compensation function. Background technique [0003] With the increasing pressure on global resources, energy conservation, emission reduction and resource conservation have become the trend of world economic development. As a widely used energy source, electric energy has penetrated into every aspect of industrial production, society and people's life. my country's power grid has some shortcomings such as low load rate, frequent power factor changes, and insufficient reactive power compensation capacity. The country has formulated relevant policy plans and invested a lot of money to strengthen the construction and transformation of the power system, improve the efficiency ...
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IPC IPC(8): H02J3/38H02S40/32H02J3/18
CPCY02E10/56Y02E40/30
Inventor 徐晓轶张敏叶颖杰曹锦晖白杨袁健华杨鸣袁松钱霜秋
Owner STATE GRID CORP OF CHINA