Inverter lightning protection method, circuit and device and inverter grid-connected system
A lightning protection circuit and lightning protection technology, applied in emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve the problem of increased X capacitor performance and inverter cost Increase and other issues to achieve the effect of avoiding cost increases
Active Publication Date: 2019-02-26
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology
[0005] The invention provides an inverter lightning protection method, circuit and device, and an inverter grid-connected system to solve the problem of removing the varistor between the grid phase line L and the grid zero line N in the prior art, which will cause The need to increase the performance of the X capacitor, which in turn leads to an increase in the cost of the inverter
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[0044] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.
[0045] In order to solve the problem of removing the varistor between the phase line L of the power grid and the neutral line N of the power grid in the prior art, which will bring about the need to increase the performance of the X capacitor, which will lead to an increase in the cost of the inverter, the present invention provides an inverter The lightning protection method of the inverter, the lightning protection method of the inverter is applied to the lightning protection circuit of th...
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The invention provides an inverter lightning protection method, circuit and device and an inverter grid-connected system. In the inverter lightning protection circuit, a first surge protector and a second surge protector are connected between a phase line of a power grid and a neutral line of the power grid. In the case of removing a varistor in an EMC filter circuit, if a high voltage is generated due to a lightning strike and a poor grounding of an inverter occurs, in the flow path of a current to ground of the phase line of the power grid, as the first surge protector is a voltage-limitingsurge protection device, with a conduction voltage drop, and the second surge protector is a switch-type surge protection device, with the conduction voltage drop approaching zero, the residual voltage that an X capacitor needs to withstand in the EMC filter circuit is only the conduction voltage drop of one voltage-limiting surge protection device, without the need of increasing the performance,and thus, the problem in the prior art of increased cost of inverters due to the need to increase the performance of the X capacitor is avoided.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to an inverter lightning protection method, circuit and device, and an inverter grid-connected system. Background technique [0002] figure 1 The middle dotted box shows the AC lightning protection topology of the single-phase inverter in the prior art, including the varistors MOV2 and MOV3 and the gas discharge tube GAS; The lightning strike current will go to the ground through the piezoresistor MOV2 and the gas discharge tube GAS, and the lightning strike current from the neutral line N of the power grid to the ground will go to the ground through the piezoresistor MOV3 and the gas discharge tube GAS, thereby realizing the single-phase inverter The AC lightning protection effect of the device. [0003] Due to the single-phase inverter EMC (Electro Magnetic Compatibility, electromagnetic compatibility) filter circuit, the varistor MOV1 connected between the phase line ...
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Login to View More IPC IPC(8): H02H9/04H02H9/06H02J3/38
CPCH02H9/041H02H9/06H02J3/38
Inventor 邢军陈长春薛丽英
Owner SUNGROW POWER SUPPLY CO LTD