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Simulated battery grid-connected current control strategy based on half-cycle repetitive control

A technology for simulating batteries and current control, applied to electrical components, single-network parallel feeding arrangements, output power conversion devices, etc., can solve problems such as slow dynamic response of the system, reduce harmonic content, improve dynamic response, and enhance The effect of stability

Inactive Publication Date: 2021-04-23
JIANGSU GTAKE ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the traditional repetitive control must use one power frequency cycle as the repetition step size, when the command signal changes suddenly, the traditional repetitive control needs at least one power frequency time to work, and the system convergence time results in a slow dynamic response of the system.

Method used

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  • Simulated battery grid-connected current control strategy based on half-cycle repetitive control
  • Simulated battery grid-connected current control strategy based on half-cycle repetitive control
  • Simulated battery grid-connected current control strategy based on half-cycle repetitive control

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specific Embodiment approach

[0026] figure 2 It is the corresponding system control block diagram of the present invention. From figure 2 It can be seen that the specific implementation method of the simulated battery grid-connected current control strategy based on half-cycle repetitive control proposed by the present invention is as follows:

[0027] (i) The control chip collects the AFE DC bus voltage U dc , using this as a feedback signal, the U dc * As a given signal, it is sent to the voltage loop PI regulator, and the output of the regulator is used as the d-axis current given i in the synchronously rotating dq coordinate system d * (active current), in order to achieve unit power factor grid connection, the q-axis current in the synchronously rotating dq coordinate system is given i q * (reactive current) is set to 0, if the system needs to realize the reactive power injection function, then control i q * That's it. i d * i q * The expression is as follows:

[0028]

[0029] (i...

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Abstract

The invention discloses a simulated battery grid-connected current control strategy based on half-cycle repetitive control. A main loop topology of a simulation battery using the strategy comprises a bidirectional DCDC, a three-phase half-bridge AFE, an LCL filter and a power grid. The strategy is applied to simulating AFE grid-connected current control in the battery. By optimizing the repetitive internal model and adding the instruction feed-forward channel in repetitive control, the response period of traditional repetitive control is shortened by half or more, the strategy is applied to the field of simulation batteries, the grid-connected current tracking rapidity of the system is improved, and the harmonic suppression capacity of the system is enhanced.

Description

technical field [0001] The invention relates to the field of control strategies for simulating battery grid-connected current, in particular to a control strategy for simulating battery grid-connected current based on half-cycle repetitive control. Background technique [0002] Energy storage technology, especially large-scale and large-capacity energy storage technology, plays an important role in the integration of renewable energy such as photovoltaics and wind power, and is an important part of the microgrid. With the rapid development of the electric vehicle industry in recent years, energy storage technology has become more and more closely related to the lives of ordinary people. Due to the shortcomings of battery packs such as long charging and discharging time and inflexible battery parameter configuration, it is time-consuming and expensive to conduct experiments on real battery packs, and improper operation will cause permanent damage to the battery pack. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/01H02M7/493H02M7/5387H02M1/12
CPCY02E40/40
Inventor 殷明
Owner JIANGSU GTAKE ELECTRIC CO LTD