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Method for configuring inertia matched with energy storage capacity of virtual synchronous machine

A technology of virtual synchronous machine and energy storage capacity, which is applied in the field of inertia matching to achieve the effect of optimized configuration

Active Publication Date: 2016-07-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Abstract
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Problems solved by technology

[0008] The purpose of the present invention is to provide an inertia configuration method that matches the energy storage capacity of the virtual synchronous machine, which solves the problem of the configuration of the energy storage capacity of the virtual synchronous machine and the amount of inertia it provides for the system

Method used

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  • Method for configuring inertia matched with energy storage capacity of virtual synchronous machine
  • Method for configuring inertia matched with energy storage capacity of virtual synchronous machine
  • Method for configuring inertia matched with energy storage capacity of virtual synchronous machine

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Embodiment Construction

[0083] The present invention will be further described in detail below in conjunction with specific examples.

[0084] Example: a rated power S n For a 50kVA virtual synchronous machine, the filter inductance and resistance are L=2mH, R=0.1Ω respectively, the grid voltage is U=190V, the frequency f0 is 50Hz, and the virtual inertia D=500kg·m 2 / s, grid-connected power command value P ref and Q ref 5kW and 0var respectively, the frequency fluctuation is 0.5Hz.

[0085] (1) Find the impedance and impedance angle from the known filter inductance and resistance:

[0086]

[0087] (2) From the known grid voltage, the grid-connected active power command value P ref and reactive power command value Q ref Find the power angle and potential:

[0088]

[0089] (3) Find the synchronous power coefficient:

[0090]

[0091] (4) Substitute the above-mentioned known damping factor D, rated rotor angular frequency of 314rad / s, frequency variation of 0.5Hz and power synchroniza...

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Abstract

The invention relates to a method for configuring inertia matched with energy storage capacity of a virtual synchronous machine, and belongs to the technical field of inertia matching. According to a virtual synchronous machine rotor motion equation and a virtual synchronous machine output active power expression, a small signal model between power grid frequency and output active power is obtained, and a maximum value of the output active power of the virtual synchronous machine when the power grid frequency changes, i.e., power that needs to be configured for energy storage is obtained. A method for matching the energy storage capacity of the virtual synchronous machine with virtual inertia is proposed. Optimized configuration of the energy storage capacity and the virtual inertia is realized, and an important method is provided for application and development of a virtual synchronous machine technology.

Description

technical field [0001] The invention belongs to the technical field of inertia matching, and in particular relates to an inertia configuration method for matching the energy storage capacity of a virtual synchronous machine. Background technique [0002] In recent years, due to the increasing energy problems and environmental pressure, distributed power generation forms such as photovoltaic power generation and wind power generation have developed rapidly. The penetration rate of inverters in the power system is getting higher and higher, which has led to tremendous changes in the structure of the traditional power system. In order to solve the low inertia and low damping problems of the power system brought about by the access of distributed power sources, some scholars have proposed the concept of Virtual Synchronous Machine (VSM). In recent years, research on VSM has shown that VSM can effectively increase the power system Inertia and damping can suppress the oscillation...

Claims

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Application Information

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IPC IPC(8): H02J3/28H02J3/24
CPCH02J3/24H02J3/28
Inventor 袁敞刘昌赵天扬谢佩琳肖湘宁
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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