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Self-adaptive secondary frequency modulation method for multi-virtual synchronous machine microgrid

A virtual synchronous machine and secondary frequency modulation technology, applied in the direction of reducing/preventing power oscillation, etc., can solve problems such as unreasonable distribution methods and inability to compensate unbalanced power, and achieve the effect of reasonable frequency modulation output distribution

Active Publication Date: 2020-07-10
CHONGQING UNIV
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AI Technical Summary

Problems solved by technology

However, considering the FM spare capacity, this allocation method is not very reasonable, because the virtual synchronous machines with small frequency deviation may be limited by the spare capacity, so that they cannot compensate for the excessive unbalanced power

Method used

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  • Self-adaptive secondary frequency modulation method for multi-virtual synchronous machine microgrid
  • Self-adaptive secondary frequency modulation method for multi-virtual synchronous machine microgrid
  • Self-adaptive secondary frequency modulation method for multi-virtual synchronous machine microgrid

Examples

Experimental program
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Effect test

Embodiment 1

[0134] 1. Parameter setting

[0135] This simulation example is based on a microgrid system model including wind turbines, photovoltaic units, electric vehicle clusters and traditional units, such as image 3 shown. In the system model, EVA represents the electric vehicle aggregator, and M and D are the inertia constant and damping coefficient of the generator, respectively.

[0136] The rated installed capacity of wind turbines and photovoltaic units are both 5MW. The microgrid contains 1,000 electric vehicles, and its driving rules refer to the "Beijing Transportation Development Annual Report". The Monte Carlo method is used to simulate the driving behavior and SOC changes of a single electric vehicle. The environmental data adopts the measured data of a city in northern China (43°N and 112°E) in May, including wind speed, solar irradiance and temperature.

[0137] 2. Day-ahead forecast

[0138] The day-ahead prediction of the frequency regulation reserve capacity of wi...

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Abstract

The invention relates to a self-adaptive secondary frequency modulation method for a multi-virtual synchronous machine microgrid, and belongs to the field of microgrid control. According to the invention, the method comprises the steps: under the condition that communication does not exist between virtual synchronous machines, achieving thesecondary frequency modulation through improved virtual synchronous machine control based on PI control; dynamically adjusting the frequency modulation power of the virtual synchronous machines through self-adaptive adjustment of secondary frequency modulation parameters to be in direct proportion to the frequency modulation reserve capacity predicted in real time. According to the invention, the waste of power output can be avoided, and the influence ofstandby capacity limitation on the frequency modulation task completion condition is reduced.

Description

technical field [0001] The invention belongs to the field of micro-grid control, and relates to an adaptive secondary frequency regulation strategy for a multi-virtual synchronous machine micro-grid. Background technique [0002] When there are a variety of distributed power generation or energy storage in the microgrid, such as electric vehicles, wind turbines, and photovoltaic units, the traditional coordination method is centralized control frequency modulation, that is, there is a centralized control center that assigns system frequency modulation tasks To each FM participant. However, centralized control has disadvantages such as low reliability and high requirements for control center computing power and communication lines. [0003] Virtual Synchronous Generator (VSG) is a document "Q.C.Zhong and G.Weiss, "Synchronverters: inverters that mimic synchronous generators," IEEETrans.Ind.Electron., vol.58, no.4, pp.1259-1267, An inverter control technology proposed in Apr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 张谦李嫣
Owner CHONGQING UNIV
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