Transient stability control method for microgrid with multiple virtual synchronizers

A technology of transient stability and virtual synchronous machine, applied to electrical components, circuit devices, AC network circuits, etc., can solve problems such as the inability to quantitatively measure the degree of system disturbance and the difficulty in judging the system stability margin

Active Publication Date: 2019-10-08
NORTHEASTERN UNIV
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Problems solved by technology

In addition, frequency-based transient stability analysis requires time-domain simulation to verify the effect of VSG on the transient stability of the microgrid. It is difficult to judge the stability margin of the system, and it is impossible to quantitatively measure the degree of system disturbance. When VSGs are running in parallel, the frequency deviation between different VSGs is also likely to affect the accuracy of the analysis

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  • Transient stability control method for microgrid with multiple virtual synchronizers
  • Transient stability control method for microgrid with multiple virtual synchronizers
  • Transient stability control method for microgrid with multiple virtual synchronizers

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Embodiment Construction

[0095] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0096] In this embodiment, a grid-connected microgrid with three virtual synchronous machines running in parallel is analyzed. The system structure diagram of the embodiment and the VSG control block diagram are as follows figure 2 shown. Three VSGs operate in parallel to supply power to the load and connect to the power grid through the contact line. The equivalent circuit diagram is as follows image 3 As shown, the rated capacity of the three VSGs is the same, the rated active power is 6kW, the rated reactive power is 1kVA, the rated voltage is 380V, and the rated angular velocity is 314rad / s. The VSG and the grid jointly supply energy to the load (20kW 4kVA).

[009...

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Abstract

The invention discloses a transient stability control method for a microgrid with multiple virtual synchronizers, and belongs to the technical field of microgrid transient stability analysis and control. According to the method, the virtual inertia, the virtual damping, the virtual governor sag coefficient and the reactive power control loop sag coefficient are fully considered, an energy functionmodel of the microgrid with multiple virtual synchronizers operating in parallel is constructed and the stability of the system is analyzed and judged based on the energy function. Besides, an adaptive control method based on the energy function is applied to perform adaptive real-time adjustment on the virtual inertia, the virtual damping, the virtual governor sag coefficient and the reactive power control loop sag coefficient in VSG so as to reduce the system energy after the system failure, increase the attraction region of the system, slow down the process of the system energy reaching the critical energy, obtain the effective time for the failure removal and improve the transient stability of the system.

Description

technical field [0001] The invention relates to the technical field of micro-grid transient stability analysis and control, in particular to a micro-grid transient stability control method with multiple virtual synchronous machines. Background technique [0002] In recent years, the depletion of fossil energy and the intensification of the environmental crisis have promoted the rapid development of distributed power generation technology. As a system composed of distributed generation (DG), energy storage devices, power electronic converters and loads, microgrids are becoming more and more popular in modern power networks. The virtual synchronous machine control strategy (VSG) introduces the electromechanical transient equation similar to the traditional synchronous generator SG in the control link of the power electronic converter, and the distributed power supply can not only simulate the operation of the SG's active power frequency modulation and reactive power voltage re...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 马大中李林娟刘丽月王睿胡旌伟孙秋野林森安恩慧李宇阳程科
Owner NORTHEASTERN UNIV
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