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A Coordinated Control Method for Hybrid Microgrid System Based on Virtual Synchronous Motor

A virtual synchronous motor and coordinated control technology, applied in the direction of electrical components, etc., can solve the problems of not considering the characteristics of the power grid on both sides of the AC and DC, high system reliability and robustness, and small system inertia, so as to provide system reliability and Robustness, flexible control, stable and reliable control effect

Active Publication Date: 2020-04-14
ZHUHAI POWER SUPPLY BUREAU GUANGDONG POWER GIRD CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the coordinated control strategy of hybrid microgrid coupled converters, the current main research is constant power control, voltage frequency-control and droop control. These control strategies are easy to implement, but they do not consider the characteristics of the grid on both sides of the AC and DC.
In addition, there is a coupling converter power transmission control strategy based on p.u. This method is affected by line parameters, the system inertia is small, and it does not have high system reliability and robustness.

Method used

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  • A Coordinated Control Method for Hybrid Microgrid System Based on Virtual Synchronous Motor
  • A Coordinated Control Method for Hybrid Microgrid System Based on Virtual Synchronous Motor
  • A Coordinated Control Method for Hybrid Microgrid System Based on Virtual Synchronous Motor

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Embodiment 1

[0048] Such as figure 1 As shown, a hybrid microgrid system based on a virtual synchronous motor, which includes an AC subnet 1, a DC subnet 2, a coupling converter unit, an AC load and a DC load, and the AC load and the AC subnet 1 The DC load is connected to the DC sub-network 2, the coupling converter unit is connected to the AC sub-network 1 through the AC power distribution bus, and the coupling converter unit is connected to the DC sub-network 1 through the DC power distribution bus. The subnet 2 is connected, the AC subnet 1 is connected to the AC power distribution bus through the AC line impedance, and the DC subnet 2 is connected to the DC power distribution bus through the DC line impedance.

[0049] Such as figure 1 As shown, the coupled converter unit includes a DC / AC converter 3, and an AC-DC coordination controller 4 for controlling the DC / AC converter 3, and the AC-DC coordination controller 4 flexibly controls the DC / AC converter 3 to realize the optimal di...

Embodiment 2

[0053] This embodiment is the coordinated control method of the hybrid microgrid system described in Embodiment 1, which includes the following steps:

[0054] Step (1): Sampling the voltage V of the AC distribution bus ac , DC distribution bus voltage V dc , The filter inductor current I of the coupled converter unit ac , filter capacitor voltage V oac and output line current I oac ;

[0055] Step (2): Use phase-locked loop technology to detect the frequency f of the AC power distribution bus ac ;

[0056] Step (3): Through the normalization module, the frequency f of the AC distribution bus ac and DC distribution bus voltage V dc Perform normalization processing to obtain the frequency per unit value f pu and voltage per unit V pu ;

[0057] Step (4): The filter capacitor voltage V of the coupling converter unit sampled in step (1) oac and output line current I oac Sent to the power calculation module, the average active power P is obtained after filtering o and...

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Abstract

The invention provides a hybrid micro-grid system based on a virtual synchronous motor. The hybrid micro-grid system based on the virtual synchronous motor is characterized by comprising an alternating current subnet, a direct current subnet, a coupling converter unit, an alternating current load and a direct current load, wherein the alternating current load is connected with the alternating current subnet; the direct current load is connected with the direct current subnet; the coupling converter unit is connected with the alternating current subnet through an alternating current distribution bus; the coupling converter unit is connected with the direct current subnet through a direct current distribution bus; the alternating current subnet is connected with the alternating current distribution bus through an alternating current line impedor; and the direct current subnet is connected with the direct current distribution bus through a direct current line impedor. The invention provides a coordinated control method for the hybrid micro-grid system. According to the coordinated control method provided by the invention, the characteristics of reasonable optimized allocation of tidalcurrent of the alternating and direct current subnets, stable running regions, capacity limitation and the like are fully considered; the power utilization demands of different users can be adapted;and virtual inertia is provided to ensure system voltage / frequency stability.

Description

technical field [0001] The present invention relates to the technical fields of distributed power generation and hybrid microgrid, and more specifically, to a coordinated control method for a hybrid microgrid system based on a virtual synchronous motor. Background technique [0002] Distributed power generation has unique advantages such as less pollution, high energy utilization rate, flexible installation location, and low loss of transmission and distribution resources and transmission lines. It will gradually become a powerful supplement and effective support for large-scale power grids in the future, and it will be one of the development trends of future power systems. , solar photovoltaic power generation is one of the most promising forms of distributed power generation. Microgrid is a micro power generation system that makes full use of the value and benefits of these distributed energy sources, and integrates energy storage devices, power electronic devices, related...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J5/00
Inventor 姜海龙刘尧陈建福林超候小超邹国惠孙海光郝琰
Owner ZHUHAI POWER SUPPLY BUREAU GUANGDONG POWER GIRD CO
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