Microgrid inverter and grid-connected and off-grid control method thereof

A control method and inverter technology, which can be applied in AC network circuits, sustainable manufacturing/processing, and single-grid parallel feeding arrangements, etc., can solve the problem of energy storage inverters without microgrids, etc.
CN104410097AActive Publication Date: 2015-03-11EAST GRP CO LTD
4 Cites 53 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
EAST GRP CO LTD
Publication Date
2015-03-11

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The present invention discloses a microgrid inverter and a grid-connected and off-grid control method thereof. The method includes: a dispatchable microgrid inverter supporting a microgrid voltage frequency works in different control modes under grid-connected and off-grid conditions; when the microgrid works under grid-connected or off-grid conditions, a central control unit controls the dispatchable microgrid inverter to work in a PQ control mode, a droop control mode or a virtual synchronous generator control mode, and to transmit electricity to a large power grid or absorb electricity from the large power grid according to requirements of the microgrid central control unit; when the microgrid is in an isolated island operation mode, the dispatchable microgrid inverter is required to show voltage source characteristics to the external, and can support the voltage frequency of the power grid; in a microgrid with a master-slave control structure, the dispatchable microgrid inverter works in a VF control mode; and in a microgrid with peer-to-peer control, droop control or virtual synchronous generator control is adopted. The method can control the inverter to work in different control modes according to actual operation conditions of the microgrid, thereby increasing security and reliability of the operation of the microgrid.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the technical field of a method for feeding power in parallel to a network by two or more generators, converters or transformers, and in particular to a control method for grid-connected and off-grid inverters of a microgrid. Background technique

[0002] Microgrid is an effective way to solve large-scale distributed power generation access to the grid, and it is a research hotspot in the field of distributed power generation in recent years. The micro-grid contains a variety of micro-sources, and all the micro-sources in the AC micro-grid are integrated into the micro-grid through the inverter. Therefore, the design and control of the inverter is an important direction of micro-grid research. Distributed power generation is a field that has developed rapidly in the past decade. At present, there are a variety of inverters with mature technologies on the market, including photovoltaic inverters, power generation inverters, and ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More