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Grid-connected inverter control method and system based on grid asymmetrical fault

An inverter and asymmetric technology, which is applied in the field of grid-connected inverter control based on grid asymmetric faults, can solve the problems of safe operation restrictions endangering the safety of the converter itself, reducing the maximum active power output capability, etc. Easy to apply online, ensure normal operation and longevity, wide range of effects

Active Publication Date: 2021-07-23
CHONGQING UNIV
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Problems solved by technology

Insufficient consideration of safe operation constraints may endanger the safety of the converter itself; strictly limiting the instantaneous active power fluctuation amplitude to 0 will make the solution simple, but will greatly reduce the maximum active power output capability

Method used

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  • Grid-connected inverter control method and system based on grid asymmetrical fault
  • Grid-connected inverter control method and system based on grid asymmetrical fault
  • Grid-connected inverter control method and system based on grid asymmetrical fault

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Embodiment Construction

[0044] In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that these embodiments may be practiced without these specific details. Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0045] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0046] figure 1 It is a schematic diagram of a block diagram of an embodiment of the grid-connected inverter control system based on asymmetric faults in the grid according to the present invention, as shown in figure 1 As shown, the new energy module 1 transmits electricity to the grid 3 through the grid-connected inverter 2, and the control system includes:

[0047]The collection module 10 collects the output voltage and output current of...

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Abstract

The present invention provides a grid-connected inverter control method and system based on grid-connected asymmetrical faults, controlling the grid-connected inverter connected between the new energy module and the grid, including: The parameter limit value of safe power transmission by the grid, including the limit value of active power fluctuation range and the maximum phase current limit value; according to the type of fault and the degree of drop, the upper limit value of active power output of the grid-connected inverter and the positive and negative The proportion of the active power of the grid-connected inverter; the PI adjustment of the DC bus voltage of the grid-connected inverter and its reference value to obtain the active power reference; the reference value of the output current of the grid-connected inverter is determined according to the proportion of the active power reference and the positive-sequence active power ; Drive the grid-connected inverter to output current according to the current reference value. The method and system can ensure the safe operation of the grid-connected inverter in the case of an asymmetric fault of the grid, and ensure the normal operation and service life of the grid-connected converter.

Description

technical field [0001] The present invention relates to the technical field of grid equipment control, and more specifically, to a grid-connected inverter control method and system based on grid asymmetric faults. Background technique [0002] In recent years, with the rapid increase of the proportion of new energy in the power generation capacity of the power grid, its impact on the stable operation of the power grid has become increasingly significant. In order to ensure the stability of the grid, many grid standards require wind turbine converters or photovoltaic systems to have low-voltage ride-through capabilities during faults, and some grid standards also require active power injection for support. Injecting active power can reduce the active power deficit of the power grid and reduce the risk of large-scale collapse of the power grid. In addition, in the case of low-voltage microgrid, the transmission line is resistive, the traditional relationship between voltage a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
CPCH02J3/383H02J3/38Y02E10/56
Inventor 杜雄熊浩时颖孙鹏菊罗全明
Owner CHONGQING UNIV
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