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An inertial matching method and a control system based on a synchronous generator and virtual synchronous generator parallel micro-network

A synchronous generator and virtual synchronization technology, applied in the direction of single-grid parallel feeding arrangement, reducing/preventing power oscillation, etc., can solve the problems of fast response speed, power oscillation, reducing system power distribution capacity, etc. Guarantee the effect of stable operation

Active Publication Date: 2019-01-11
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the research on the stability of VSG parallel operation is relatively mature, but the problem of parallel connection of SG and VSG is more complicated. Due to the inertia of the rotating shaft, the VSG responds quickly to the load power demand during load mutation or switching on and off, which is easy to cause large power oscillations and offsets, which affects the stable operation of important loads in the microgrid and reduces system power distribution. Ability
There are relatively few studies on these aspects at present, which urgently requires those skilled in the art to solve corresponding technical problems

Method used

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  • An inertial matching method and a control system based on a synchronous generator and virtual synchronous generator parallel micro-network
  • An inertial matching method and a control system based on a synchronous generator and virtual synchronous generator parallel micro-network
  • An inertial matching method and a control system based on a synchronous generator and virtual synchronous generator parallel micro-network

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Embodiment 1

[0040] Embodiment 1: An inertia matching method based on synchronous generators and virtual synchronous generators connected in parallel to the microgrid. Combine below figure 1 and figure 2 The method provided in this embodiment will be described in detail.

[0041] S1: Parameter virtual inertia J in VSG vsg Design, refer to the parameter moment of inertia J in SG sg And the calculation of the system capacity relationship between SG and VSG;

[0042] see figure 1 , the difference in intrinsic inertia between SG and VSG leads to the difference in inertia time constant. The inertia time constant H represents the time period for the transient process to return to a steady state. Ensuring that H is equal means that the matching of the transient response time of different micro-sources is realized. For synchronous generators, H cannot be changed, its size depends on the physical structure of SG, and has the following relationship with the moment of inertia J:

[0043]

...

Embodiment 2

[0075] Embodiment 2: A microgrid control system based on the parallel connection of synchronous generators and virtual synchronous generators. Combined with Figure 1 to Figure 4 The system provided in this embodiment will be described.

[0076] see figure 1 , the system includes: SG, distributed power supply, filter, load, VSG control module (including phase angle pre-parallel compensation module), governor module, exciter module, phase-locked loop module and pre-parallel judgment module.

[0077] Among them, SG, distributed power supply, full-bridge inverter, filter and load constitute the main circuit of the micro-grid control system, and the prime mover governor and exciter are SG micro-source controllers, which are used to set the SG active power and Reactive power, in which the governor is a large inertial link. The VSG control module provides switching signals for the full-bridge inverter, and the phase-locked loop module provides the frequency and phase angle signal...

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Abstract

The invention discloses an inertia matching method and a control system based on a synchronous generator and virtual synchronous generator parallel micro-network. The method comprises the following steps: the VSG virtual inertia coefficient is designed according to the SG moment of inertia and the system capacity to ensure the matching of the transient response time between different micro-sources; according to the principle of primary frequency modulation and droop control, the proportional coefficient of prime mover governor and the droop coefficient of VSG are designed, and the load power is distributed according to the system capacity. When the micro-source and load are cut in, the given active power of VSG is adjusted dynamically according to the change of the power angle of the parallel system, and the given active power coefficient is designed according to the system damping ratio, which compensates the inertial difference caused by the inertial response delay of SG governor andrealizes the smooth cut in of VSG. The invention can eliminate power oscillation caused by micro-source and load cutting, meet power distribution requirements of micro-grid, and realize synchronous and stable operation of SG and VSG parallel micro-network.

Description

technical field [0001] The invention belongs to the technical field of distributed power generation microgrids, and in particular relates to an inertia matching method and a microgrid control system based on synchronous generators and virtual synchronous generators connected in parallel to microgrids. Background technique [0002] In recent years, the penetration rate of distributed energy has been increasing, the installed capacity of traditional synchronous generators has gradually decreased, and the rotating reserve capacity and moment of inertia in the microgrid have been relatively reduced, gradually showing a trend of high power electronics. Due to the inertia and damping of the mechanical rotor, the synchronous generator has voltage and frequency support and adjustment capabilities, providing sufficient inertia for the microgrid system. Drawing on this idea, virtual synchronous generator technology emerged as the times require. It integrates the flexibility of power e...

Claims

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Application Information

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IPC IPC(8): H02J3/42H02J3/48H02J3/50H02J3/24
CPCH02J3/24H02J3/42H02J3/48H02J3/50
Inventor 施凯宋文涛徐培凤孙宇新刘奕辰
Owner JIANGSU UNIV
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