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Improved Droop Control Method of Inverter Based on Virtual Synchronous Machine Technology

A technology of virtual synchronous machines and control methods, applied in the direction of single-network parallel feed arrangement, etc., can solve problems such as the influence of reactive power distribution accuracy and connection line impedance voltage drop, achieve reasonable distribution, ensure distribution accuracy, and maintain normal levels Effect

Active Publication Date: 2022-04-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

On the premise of realizing power decoupling, traditional droop control can only guarantee the reasonable distribution of active power, while the precision of reactive power distribution is obviously affected by the impedance voltage drop of the connecting line

Method used

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  • Improved Droop Control Method of Inverter Based on Virtual Synchronous Machine Technology
  • Improved Droop Control Method of Inverter Based on Virtual Synchronous Machine Technology
  • Improved Droop Control Method of Inverter Based on Virtual Synchronous Machine Technology

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Embodiment Construction

[0055] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific examples are only used to further explain the present invention, rather than limit the present invention.

[0056] Such as figure 1 -7, the improved droop control method comprises the following steps:

[0057] Step 1: At the inverter port, that is, at the head end of the connection line between the microgrid and the public grid, collect the instantaneous value of the three-phase voltage u o and the instantaneous value of the three-phase current i o , to obtain the instantaneous active power at the head end of the line p VSG and instantaneous reactive power q VSG , obtained after filtering P VSG and Q VSG :

[0058] According to the following formula, the instantaneous active power at the head end of the connecting line is obtained p VSG and instantaneous reactive power q V...

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Abstract

The invention discloses an inverter improved droop control method based on virtual synchronous machine technology, which belongs to the field of low-voltage micro-grid inverter control. The present invention is based on the connection line impedance and the collected three-phase current instantaneous value i o , to obtain the active power loss △P and reactive power loss △Q of the connecting line, and the active power at the head end of the connecting line P VSG and reactive power Q VSG Make a difference to get the active power at the end of the connecting line P U and reactive power Q U ;According to the impedance of the connecting line, the instantaneous value of the three-phase voltage collected u o and the instantaneous value of the three-phase current i o , to obtain the connection line pressure drop △u, and u o Obtain the effective value of the voltage at the head end of the connecting line through RMS measurement after making a difference U U , while obtaining the actual angular frequency ω ; According to the droop control equation and the rotor motion equation, the virtual synchronous machine control is completed, and the voltage control command is obtained. The invention realizes the decoupling of the steady-state power of the inverter, the controllable droop characteristic and voltage of the user side, and the reasonable distribution of power when multiple machines are connected in parallel.

Description

technical field [0001] The application relates to an inverter droop control method based on virtual synchronous machine technology, which belongs to the field of low-voltage microgrid inverter control. In particular, it relates to an improved droop control method for inverters based on virtual synchronous machine technology. Background technique [0002] In order to alleviate the contradiction between distributed power generation and large power grid, the concept of microgrid has been proposed and widely studied. The microgrid can not only run in parallel with the grid, but also be able to separate from the main grid and switch to island operation when the large grid fails or needs to be repaired within the plan. The control strategies for island operation that are widely used mainly include master-slave control and peer-to-peer control, among which the peer-to-peer control mode based on droop control has received more attention due to its high self-stability, autonomy and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/48H02J3/50
CPCH02J3/48H02J3/50
Inventor 颜湘武崔扬
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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