A control method and device for an inverter
A control method and inverter technology, applied in the power field, can solve problems such as damage to the reliability and stability of the power supply system, inverter output voltage fluctuations, active or reactive power imbalance, etc. The effect of seamless switching, reducing current impact and preventing mutation
Active Publication Date: 2021-07-20
HEFEI WIN POWER
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Problems solved by technology
[0003] However, when the inverter is switched from the off-grid mode to the grid-connected mode, because the amplitude and phase of the inverter output voltage are not synchronized with the grid, instantaneous overvoltage or overcurrent will occur when the switch operates; the grid-connected mode When switching to the off-grid mode, due to the power exchange on both sides, after the grid-connected switch is disconnected, the active or reactive power will be unbalanced, which will eventually lead to fluctuations in the output voltage of the inverter, which will affect the normal operation of the load and damage the power supply. System Reliability and Stability
[0004] The existing seamless switching control methods often only modify the calculation method of the reference current command during switching, or artificially add virtual impedance to reduce the current impact, and do not fundamentally eliminate the current impact and voltage fluctuations before switching. s reason
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[0077] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.
[0078] An embodiment of the present application provides a control method for an inverter, and the method is applied to a control component in a power system. like figure 1 As shown, the power system further includes a battery, an inverter, a three-phase inductive filter, a transformer, a load, a grid-connected switch, and a power grid. The battery is connected to the input end of the inverter, the output end of the inverter is connecte...
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Embodiments of the present application provide an inverter control method and device, which relate to the field of electric power technology. The method is applied to the control components in the power system, and the power system also includes an inverter, a grid and a grid-connected switch, and the inverter is connected to the grid through the grid-connected switch. The method includes: when the inverter is in an off-grid state , detect the parameters of the output voltage of the inverter and the parameters of the grid voltage of the grid; when the parameters of the grid voltage meet the first preset grid connection conditions, control the output voltage of the inverter to track the grid voltage of the grid so that The amplitude difference, frequency difference and phase difference between the output voltage of the inverter and the grid voltage of the power grid meet the second preset grid connection condition; when the amplitude difference between the output voltage of the inverter and the grid voltage of the grid, When the frequency difference and the phase difference meet the second preset grid-connection condition, the grid-connection switch is controlled to be turned on. The application can reduce the current impact when the inverter switches from the off-grid mode to the grid-connected mode.
Description
technical field [0001] The present application relates to the field of electric power technology, and in particular, to a control method and device for an inverter. Background technique [0002] The distributed energy storage microgrid system is usually composed of distributed power sources, inverters, loads, monitoring and protection devices, and can realize flexible and efficient application of distributed power sources. The inverter in the distributed energy storage microgrid system can be disconnected from the grid and run in off-grid mode, or can be connected to the grid and then run in grid-connected mode. The inverter can switch from off-grid mode to grid-connected mode, or switch from grid-connected mode to off-grid mode according to actual application requirements. [0003] However, when the inverter is switched from the off-grid mode to the grid-connected mode, since the amplitude and phase of the output voltage of the inverter are not synchronized with the grid, ...
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IPC IPC(8): H02J3/38H02M7/48
CPCH02J3/38H02M7/48
Inventor 张为民周一晨温圣强
Owner HEFEI WIN POWER