An improved VSG secondary frequency modulation controller and control method

A technology of secondary frequency modulation and control method, applied in the direction of single-grid parallel feeding arrangement, reducing/preventing power oscillation, etc., which can solve the problems such as the steady-state output power of the frequency-modulated inverter, the difference, and the frequency exceeding the limit.

Inactive Publication Date: 2018-12-11
SHENYANG INST OF ENG
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Problems solved by technology

[0014] The technical problem to be solved by the present invention is to provide an improved VSG secondary frequency modulation controller and control method, which solves the problem that the traditional VSG frequency does not change the steady-state output power of the frequency modulation inverter, which belongs to differential regulation. When the fluctuation is large, adopt the primary frequency modulation to output power in proportion to the rated power, which may easily cause the frequency to exceed the limit

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  • An improved VSG secondary frequency modulation controller and control method
  • An improved VSG secondary frequency modulation controller and control method
  • An improved VSG secondary frequency modulation controller and control method

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[0026] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0027] The secondary frequency modulation control of this improved VSG is only used in the frequency modulation inverter. The method is simple and the principle is easy to understand. The main thing to overcome is The value of the problem, in determining Before selecting the value of , the small-signal equivalent model should be established first, and the Whether it affects the stability of VSG control can only be further studied when it is judged that it does not affect the stability of VSG. Figure 4 is the equivalent circuit of the inverter in island mode. Figure 4 is the equivalent circuit model of the microgrid ...

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Abstract

An improved VSG secondary frequency modulation controller and control method are disclosed. When constant frequency limit exceeding occurs to a systme, a PI control is automatically put into an integral link at that virtual damping part of the frequency modulation invert, The micro-power supply which is responsible for frequency modulation can automatically track the load fluctuation and make no-difference regulation, so that the secondary frequency modulation function of micro-grid can be realized, and the stability of the designed secondary frequency modulation control method is analyzed byusing small signal equivalence and root locus analysis method. And the frequency control method of VSG is designed.

Description

technical field [0001] The invention belongs to the field of frequency modulation inverters and is applied to microgrids operating in isolated islands, specifically an improved VSG secondary frequency modulation controller and a control method. Background technique [0002] The microgrid is generally composed of multiple inverters and loads. Following the principle of synchronous generators, each VSG in the microgrid also needs to be equipped with a virtual governor to perform frequency control. The control algorithm is used to simulate the governor of the synchronous generator , the mathematical model of the speed governor is introduced into the control loop to realize the function of the speed governor, so that a frequency modulation can be performed. [0003] The principle of primary frequency modulation and secondary frequency modulation of traditional power system is as follows: figure 1 shown. [0004] figure 1 Among them, PG is the power-frequency static characteri...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/48
CPCH02J3/24H02J3/48
Inventor 刘莉魏家鹏沈丽冷雪王宝石王达
Owner SHENYANG INST OF ENG
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