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Inertia compensator based on virtual synchronous generator rotor inertia power decoupling

A generator rotor, power decoupling technology, applied in the field of inertia compensator, can solve the problems of reduced grid frequency stability, fast response speed, lack of inertial structure of the inverter, etc., to achieve improved adjustability, fast response speed, Avoid the effects of complex control algorithms

Active Publication Date: 2018-10-19
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of inertial structure of the inverter, the response speed of these two control strategies is too fast, which reduces the stability of the grid frequency.

Method used

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  • Inertia compensator based on virtual synchronous generator rotor inertia power decoupling
  • Inertia compensator based on virtual synchronous generator rotor inertia power decoupling
  • Inertia compensator based on virtual synchronous generator rotor inertia power decoupling

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Experimental program
Comparison scheme
Effect test

Embodiment

[0066] This embodiment sequentially simulates the droop control method, the virtual synchronous generator control method and the control method using the static inertia compensator of the present invention to the power characteristics when the system load undergoes a step change, and the simulation parameters are shown in Table 1:

[0067] Table 1 Simulation parameter settings

[0068] parameter

value

Rated output powerP ref

50kW

Load fluctuation power ΔP ref

20kW

Droop coefficient k

15916

VSG moment of inertia J

1.5kg m 2

SIC moment of inertia J

1.5kg m 2

Rated frequency F

50Hz

[0069] (1) droop control method

[0070] The inverter adopts the drooping control strategy. At the beginning, the system operates at the rated state, and the output power is 50kW. When t=4s, the system load suddenly increases to 70kW, and the rated operation resumes after 2s. When t=10s, the system load sudden...

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Abstract

The invention relates to an inertia compensator based on virtual synchronous generator rotor inertia power decoupling. The inertia compensator comprises a power storage element, a DC / DC converter, a filter circuit, an inverter and a controller. The power storage element is connected to a power grid through the DC / DC converter, the inverter and the filter circuit in order. When a system load changes stepwise, the controller controls the DC / DC converter and the inverter to output inertial power and exhibit attenuated oscillation characteristics to compensate the moment of inertia of a system. Compared with the prior art, the inertia compensator has the advantages that the inertia of a power system is increased in a targeted way while a traditional grid-connected mode of a distributed power supply is not changed, thus the stability of the power system is improved, the adaptability of distributed power grid connection is enhanced, a virtual synchronous generator can be replaced, and thus the shortcomings of a complex control algorithm and high equipment investment of the virtual synchronous generator are avoided.

Description

technical field [0001] The invention relates to virtual synchronous generator technology, in particular to an inertia compensator based on the decoupling of virtual synchronous generator rotor inertia power. Background technique [0002] In recent years, with the increasing energy crisis and environmental pollution, distributed power generation technology using renewable energy for power generation has developed rapidly. The safe, stable and efficient grid connection of distributed power generation such as wind power and photovoltaic power generation is of great significance to improving the structural form of energy and improving the operation safety of large power grids. The inertia of the traditional synchronous generator rotor can stabilize the system frequency, but the inverter system structure lacks a rotating body with inertia, so it can only be connected to the grid as a current source. By simulating the traditional synchronous generator, the virtual synchronous gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/24H02J3/381H02J2203/20Y02E10/76
Inventor 赵晋斌李吉祥屈克庆李芬毛玲
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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