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Frequency self-recovery control method based on virtual synchronous generator

A technology of virtual synchronization and control method, applied in the direction of reducing/preventing power oscillation, etc., can solve problems such as poor frequency modulation, and achieve the effect of suppressing frequency exceeding the limit and quickly recovering frequency

Inactive Publication Date: 2019-01-11
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the studies are based on VSG primary frequency modulation control, which belongs to differential frequency modulation

Method used

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  • Frequency self-recovery control method based on virtual synchronous generator
  • Frequency self-recovery control method based on virtual synchronous generator
  • Frequency self-recovery control method based on virtual synchronous generator

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Embodiment Construction

[0027] Such as figure 1 The block diagram of the main circuit and control structure of the virtual synchronous generator shown, V dc is the DC side voltage; L and C are the filter inductance and capacitance between the three-phase inverter and the three-phase grid; i Labc is the filter inductor current; U oabc is the output voltage of the three-phase inverter; i oabc is the output current of the three-phase inverter; P and Q are the instantaneous output active and reactive power after low-pass filtering; P ref , Q ref is active and reactive reference value; E 0 、w 0 Reference port voltage and rotor electrical angular velocity ratings for the virtual synchronous machine; P, Q, P ref , Q ref ,E 0 、w 0 Input the active loop and reactive loop of the virtual synchronous generator, output the no-load potential E* of the virtual synchronous generator controller and the no-load rotor angular velocity w*, and obtain the given voltage of the voltage loop through the dq coordina...

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Abstract

The invention relates to a frequency self-recovery control method based on a virtual synchronous generator. When the virtual synchronous generator is put into a microgrid, a small moment of inertia Jis provided to avoid dynamic power oscillation. When small disturbance occurs, the primary frequency modulation method based on virtual synchronous generator is adopted. When the disturbance is large,the frequency offset exceeds a certain value to start the secondary frequency modulation, and the fast charging and discharging characteristics of the energy storage battery are utilized to make it participate in the secondary frequency modulation process, so that the frequency can be quickly restored to the threshold range; after that, the energy storage output is gradually reduced and the secondary frequency modulation is slowly withdrawn, and other frequency modulation devices play a major role in restoring the frequency to the rated value. The invention can effectively restrain the frequency exceeding the limit when the heavy load disturbance occurs, enable the frequency to be recovered quickly, combine the primary and secondary frequency modulation in the whole frequency modulation range, and give full play to the energy storage function.

Description

technical field [0001] The invention relates to an independent microgrid frequency control technology, in particular to a frequency self-recovery control method based on a virtual synchronous generator. Background technique [0002] In recent years, distributed generation with renewable energy as the main form has taken an increasing proportion in the power grid. In order to effectively manage distributed power generation, the concept of microgrid came into being. As a power electronic interface for distributed generation, the microgrid inverter has a fast response speed but lacks inertial support, which brings new challenges to the safe and stable operation of the power system. [0003] Virtual synchronous generator (virtual synchronous generator, VSG) control technology introduces virtual inertia into the control algorithm of the inverter, so that the power electronic power supply inherits the inertia and damping characteristics of the synchronous generator, which can imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 张宇华赵晓轲王育飞薛花
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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