Grid-connected seamless switching controller based on capacitive current inner ring and control method thereof

A capacitive current inner loop and seamless switching technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve unconsidered problems and achieve the effect of ensuring continuous power supply

Inactive Publication Date: 2010-04-14
HANGZHOU GUANSHAN INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional seamless switching control method does not consider the influence of the voltage difference at the moment of switching between the voltage control mode voltage regulator and the current control mode current regulator on the load voltage and grid current

Method used

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  • Grid-connected seamless switching controller based on capacitive current inner ring and control method thereof
  • Grid-connected seamless switching controller based on capacitive current inner ring and control method thereof
  • Grid-connected seamless switching controller based on capacitive current inner ring and control method thereof

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Embodiment Construction

[0013] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0014] The specific embodiment of the present invention will be described according to the accompanying drawings. Depend on figure 1 It can be seen that the power system includes an inverter based on high-frequency switching, by L f and C f Composed of low-pass filter, critical load, grid-connected switch S 1 , current and voltage sensors and the power grid, the grid-connected seamless switching controller based on the capacitive current inner loop includes a microprocessor, a voltage sampling circuit, a grid-connected switch drive circuit and an inverter power tube drive circuit, wherein the microprocessor includes a grid synchronization Module, output voltage controller, capacitive reference current generator in grid-connected mode, grid current controller, capacitive current controller, switching control command switch and inverter power tube logic generator...

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Abstract

The invention discloses a grid-connected seamless switching controller based on a capacitive current inner ring and a control method thereof. The controller comprises a microcontroller, a voltage sampling circuit, a grid-connected switch driving circuit and an inverter power tube driving circuit, wherein the microcontroller comprises an electricity grid synchronous module, an output voltage controller, a capacitive reference current generator under a grid-connected mode, a grid inlet current controller, a capacitive current controller, a control command selecting switch and an inverter power tube logic generator. The grid-connected seamless switching controller is connected with an inverter of an electricity grid through a grid-connected switch, is in an output voltage control mode when in dependent operation with load and is in a grid inlet current control mode when in grid-connected operation. The grid-connected seamless switching controller is adaptable to a grid-connected inverter capable of independently operating with grid-connected double modes, increases output voltage load adjustment rate under an independent mode, increases power factors and grid inlet current waveform quality on the condition of non-linear load and electricity grid voltage distortion under a grid-connected mode, and then realizes seamless switching of two work modes.

Description

technical field [0001] The invention relates to a control method of a grid-connected inverter capable of independent and grid-connected dual-mode operation, in particular to a grid-connected seamless switching controller and a control method thereof based on a capacitive current inner loop. Background technique [0002] With the continuous shortage of fossil energy and the increasing environmental pollution, the distributed generation system based on renewable energy has become a research hotspot, and the grid-connected inverter is an important part of it. In order to provide uninterrupted power supply for critical loads, grid-connected inverters with critical loads are required to work in both grid-connected and independent modes. In grid-connected mode, the excess energy is supplied to the grid while supplying power to key loads; in independent mode, power is supplied to key loads. However, when the key load is a nonlinear load, the traditional grid-connected control meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
Inventor 姚志垒胡国文陈荣顾春雷孙宏国薛迎成
Owner HANGZHOU GUANSHAN INSTR
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