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Power-current coordination control method for virtual synchronous generator under unbalanced power grid

A technology for power grid imbalance and generator power, applied in the direction of reducing/preventing power oscillation, electrical components, circuit devices, etc., can solve the problems of control strategy failure, no detailed controller design, etc., to achieve the effect of improving operating performance

Active Publication Date: 2018-12-07
HENAN POLYTECHNIC UNIV
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Problems solved by technology

The negative-sequence voltage control strategy proposed in some literature does not give the design of the controller in detail, and its control strategy will fail when the grid contains distorted voltage

Method used

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  • Power-current coordination control method for virtual synchronous generator under unbalanced power grid
  • Power-current coordination control method for virtual synchronous generator under unbalanced power grid
  • Power-current coordination control method for virtual synchronous generator under unbalanced power grid

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Experimental program
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Embodiment Construction

[0038] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0039] 1 VSG analysis under unbalanced power grid

[0040] 1.1 Basic principle of VSG

[0041] The essence of VSG is to simulate the operation mechanism of synchronous generators through control strategies, so that the grid-connected inverter has the advantages of synchronous generators. The main circuit topology of VSG is as follows figure 1 Shown, where: V T1 -V T6 Form a three-phase inverter bridge; L iand R i Inductance and resistance of inverter side; C f is the filter capacitor; L g and R g is the inductance and resistance of the grid-connected side. Inverter arm midpoint voltage e a 、e b and e c Simulate the internal potential of the synchronous generator, the inverter side inductance L i and R i Simulates the reactance of a synchronous generator.

[0042] The control structure of VSG is as follows figure 2 As shown,...

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Abstract

The invention relates to a power-current coordination control method for a virtual synchronous generator under an unbalanced power grid, and belongs to the field of new energy power generation. The method calculates a negative sequence current reference value in a static coordinate system according to the instantaneous power theory, and establishes a unified analytical expression of three controltargets of constant active, reactive and current balance to realize the power-current coordination control of the virtual synchronous generator under the unbalanced power grid. The problems such as power oscillation and current imbalance under the unbalanced power grid can be solved, and the system performance is improved. The method does not need complicated trigonometric function calculation, has small calculation amount and a simple control structure, and can realize corresponding control objectives according to different requirements of the power grid.

Description

technical field [0001] The invention belongs to the field of new energy power generation, and relates to a power-current coordinated control method of a virtual synchronous generator under an unbalanced power grid. Background technique [0002] In recent years, due to the increasingly prominent problems such as environmental pollution and energy shortage, in order to solve these problems, distributed power generation technology represented by renewable energy (photovoltaic, wind energy, ocean energy, etc.) is developing more and more rapidly. However, as the penetration rate of distributed power continues to increase, it means that the capacity of traditional synchronous generators is gradually reduced, which will pose serious challenges to the safety and stability of the power system. Therefore, the task of distributed power generation technology is not simply to provide power to the grid, but also to have a certain ability to adjust the voltage amplitude and frequency of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/24
CPCH02J3/00H02J3/24
Inventor 杨明高龙将蒋智化张国澎杜少通
Owner HENAN POLYTECHNIC UNIV
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