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Energy storage converter inertia simulation method based on parallel generalized integrator

A generalized integrator and inertia simulation technology, which is applied in the field of energy storage converters, can solve problems such as harmonic component interference, energy storage converter grid-connected current quality and operational stability deterioration, so as to avoid harmonic amplification and improve The effect of frequency stability

Pending Publication Date: 2021-06-29
GUILIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0007] It can be seen from the above that none of the existing technologies can solve the problem that the inertia simulation control strategy of the energy storage converter is easily disturbed by the harmonic components contained in the grid voltage. The problem of poor running stability

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  • Energy storage converter inertia simulation method based on parallel generalized integrator
  • Energy storage converter inertia simulation method based on parallel generalized integrator
  • Energy storage converter inertia simulation method based on parallel generalized integrator

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Embodiment Construction

[0052] The following specific implementation methods will be further described in conjunction with the above-mentioned accompanying drawings, specifically as follows:

[0053] The topology used in the present invention is as figure 1 As shown, the relevant parameters of this embodiment are set as follows: DC bus voltage U dc is 550V, the effective value of the output AC line voltage is 380V / 50Hz, the rated capacity is 100kVA, the filter inductance of the bridge arm side of the energy storage converter is L=0.56mH, the filter capacitor of the energy storage converter is C=90uF, and the isolation transformer is 100kVA 270V / 400V Dyn11 type transformer.

[0054] see figure 1 , a kind of energy storage converter inertia simulation method based on parallel generalized integrator proposed by the present invention comprises the following steps:

[0055] Step 1, first collect the inductor current i of the bridge arm side of the energy storage converter la i lb i lc and grid volt...

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Abstract

The invention discloses an energy storage converter inertia simulation method based on a parallel generalized integrator, and aims to solve the problem that the power grid voltage harmonic disturbance suppression capability of an inertia simulation method based on a second-order generalized integrator-frequency-locked loop evaluation frequency differential signal is limited. According to the implementation method, a plurality of frequency adaptive filters based on a second-order generalized integrator principle are fed into a control loop of a second-order generalized integrator-frequency-locked loop in parallel to form a parallel generalized integrator-frequency-locked loop, so that accurate evaluation of power grid frequency differential signals is realized. And the power grid frequency differential signal is directly applied to the inertia simulation method of the energy storage converter, so that the inertia simulation method provided by the invention not only can avoid the problem of harmonic amplification introduced by the power grid frequency differential operation, but also can eliminate the influence of harmonic waves contained in the power grid voltage on the inertia response performance; and the method can be widely applied to a grid-connected operation system of the energy storage converter.

Description

technical field [0001] The invention relates to a method for simulating the inertia of an energy storage converter based on a parallel generalized integrator, which is suitable for an energy storage converter that needs to be connected to a grid. Background technique [0002] In recent years, the connection of renewable energy to the power grid through the interface of fast power converters has attracted widespread attention. However, traditional power converters usually lack rotating mechanical parts and cannot provide corresponding inertia support for the power grid, which will easily lead to a significant reduction in the equivalent inertia of the power grid. The safe and reliable operation of the power system has brought severe challenges. The lack of inertia of the power grid often causes two types of frequency-related stability problems. One is the gradual acceleration of the frequency change rate of the power system, and the other is the increasing frequency amplitude...

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Application Information

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IPC IPC(8): H02J3/38H02J3/48H02J3/24
CPCH02J3/38H02J3/48H02J3/24Y02E40/40
Inventor 石荣亮张烈平王文成于雁南王舟
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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