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Micro-grid secondary frequency modulation control method based on virtual synchronous generators

A virtual synchronization, secondary frequency modulation technology, applied in the direction of single-network parallel feeding arrangement, reducing/preventing power oscillation, etc., can solve the problems of complex implementation method, no static frequency error, lack of stability analysis, etc., to improve stable operation. performance, the effect of avoiding communication lines

Active Publication Date: 2019-09-27
HUNAN UNIV OF TECH
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Problems solved by technology

The above methods can reduce the impact of load fluctuations on system frequency and reduce frequency deviation to a certain extent, but the implementation method is relatively complicated, lacks stability analysis, and is not conducive to guiding engineering applications, and some methods cannot truly achieve frequency control. static difference

Method used

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  • Micro-grid secondary frequency modulation control method based on virtual synchronous generators
  • Micro-grid secondary frequency modulation control method based on virtual synchronous generators
  • Micro-grid secondary frequency modulation control method based on virtual synchronous generators

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Embodiment Construction

[0027] The present invention will be further described below in combination with specific embodiments.

[0028] figure 1 is the electrical diagram of a virtual synchronous generator, where U dc is the DC bus voltage; e is the internal potential; i is the stator current; u is the machine terminal voltage; L s is the stator reactance; C f is the filter capacitor; under the three-phase natural coordinates, the mathematical equation of VSG is:

[0029]

[0030] T e = M f i f (2)

[0031] Q=-ωM f i f (3)

[0032] e=ωM f i f A (4)

[0033] In formulas (2), (3), represent the inner product, and A, B are

[0034]

[0035] The frequency control of VSG is realized through the rotor motion equation, in which the damping coefficient is used as the adjustment coefficient, and the filter inductance is equivalent to the stator reactance.

[0036] Active power-frequency control block diagram see figure 2 . From formula (1) can get:

[0037]

[0038] VSG frequency...

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Abstract

The invention provides a micro-grid secondary frequency modulation control method based on virtual synchronous generators. In view of the shortcoming of the primary frequency modulation of the virtual synchronous generators, a frequency deviation is introduced into a PI controller to realize system systematic error frequency modulation, the frequency modulation power of multiple virtual synchronous generators are uniformly distributed, and a small signal model is configured to analyze the influence of PI parameters on system stability.

Description

technical field [0001] The invention relates to the technical field of micro-grid control, and more specifically, to a micro-grid secondary frequency modulation control method based on a virtual synchronous generator. Background technique [0002] Microgrid is a medium and low voltage small distribution network composed of distributed power sources, energy storage devices, local loads and related protection devices. Microgrid includes two operation modes: network operation mode and island operation mode. In the network operation mode, the frequency and voltage of the microgrid are controlled by the large grid, and the specified output of active power and reactive power is realized according to the PQ control strategy. In the island operation mode, through the droop control strategy, each micro-power source adjusts the frequency and voltage of the micro-grid according to the droop characteristic. However, this method has the possibility of failure to switch between various ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/48H02J3/24
CPCH02J3/48H02J3/24H02J2203/20
Inventor 李圣清张东辉
Owner HUNAN UNIV OF TECH
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