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An adaptive secondary frequency regulation method for multi-virtual synchronous machine microgrid

A technology of virtual synchronous machine and secondary frequency modulation, 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 solving low communication reliability

Active Publication Date: 2021-08-17
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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  • An adaptive secondary frequency regulation method for multi-virtual synchronous machine microgrid
  • An adaptive secondary frequency regulation method for multi-virtual synchronous machine microgrid
  • An adaptive secondary frequency regulation method for multi-virtual synchronous machine microgrid

Examples

Experimental program
Comparison scheme
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 an adaptive secondary frequency modulation method for a multi-virtual synchronous machine micro-grid, belonging to the field of micro-grid control. In this method, when there is no communication between virtual synchronous machines, the improved virtual synchronous machine control based on PI control is used to realize the secondary frequency modulation, and the frequency modulation power of the virtual synchronous machine is dynamically adjusted through the adaptive adjustment of the secondary frequency modulation parameters, so that It is directly proportional to the FM reserve capacity predicted in real time. The invention can avoid the waste of power output, and at the same time reduce the impact of reserve capacity limitation on the completion of frequency modulation tasks.

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 Patents(China)
IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 张谦李嫣
Owner CHONGQING UNIV