Energy storage converter system, converter, and control method and controller of bidirectional converter

A technology of energy storage converters and bidirectional converters, applied in AC network load balancing, AC network to reduce harmonics/ripples, harmonic reduction devices, etc., can solve the problem of sub-high frequency harmonic filtering effect Good and other problems, to achieve the effect of quality improvement

Pending Publication Date: 2017-03-22
GUANGZHOU ZHIGUANG ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a control method and a controller for an energy storage converter system, a converter, and a bidirectional converter, so as t

Method used

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  • Energy storage converter system, converter, and control method and controller of bidirectional converter
  • Energy storage converter system, converter, and control method and controller of bidirectional converter
  • Energy storage converter system, converter, and control method and controller of bidirectional converter

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Embodiment 1

[0032] figure 1 The structural block diagram of the controller of the bidirectional converter in the energy storage converter provided by the embodiment of the present invention, such as figure 1 As shown, the controller 1 includes: a first subtractor 11, a quasi-proportional resonant controller 12, a linear Kalman filter 13, a first gainer 14, a second subtractor 15, PWM (Pulse Width Modulation, pulse width modulation ) generator 16;

[0033] The first subtractor 11 is connected with the quasi-proportional resonant controller QPR 12, and is used to subtract the predetermined feeder current reference value from the AC side inductor current of the energy storage converter to obtain a deviation signal and send it to the quasi-proportional resonant controller QPR 12; Among them, the reference value of feeder current is AC current;

[0034] The quasi-proportional resonant controller QPR 12 is connected to the second subtractor 15 for modulating the received deviation signal to o...

Embodiment 2

[0069] This embodiment adopts the same technical idea as that of Embodiment 1, and provides a method for controlling a bidirectional converter in an energy storage converter.

[0070] image 3 The flow chart of the control method of the bidirectional converter in the energy storage converter provided by the embodiment of the present invention, as shown in image 3 As shown, the method includes:

[0071] S300. Subtracting the predetermined reference value of the feeding grid current from the inductor current on the AC side of the energy storage converter to obtain a deviation signal, and modulating the deviation signal through a quasi-proportional resonant controller to obtain a voltage reference signal.

[0072] S320. Perform linear Kalman filter processing on the feeder current on the AC side of the energy storage converter to obtain state estimation signals of each harmonic current in the feeder current.

[0073] S340. Subtract the state estimation signal of each harmonic ...

Embodiment 3

[0103] Based on the same technical concept as the first embodiment, this embodiment provides an energy storage converter.

[0104] Figure 4 The structural block diagram of the energy storage converter provided for the embodiment of the present invention, such as Figure 4 As shown, the energy storage converter 400 includes a bidirectional converter 4 and the controller 1 in the first embodiment. For the structure of the controller 1 in this embodiment, please refer to the relevant description of the first embodiment, and will not repeat them here. .

[0105] During implementation, the bidirectional converter 4 and the controller 1 can be integrated into one.

[0106] Wherein, the bidirectional converter 4 in this embodiment is a full-bridge circuit topology composed of power switching devices, and the power switching devices may be but not limited to IGBT (Insulated Gate Bipolar Transistor, Insulated Gate Bipolar Transistor), MOS transistor (Insulated Gate Field Effect Tra...

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PUM

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Abstract

The invention discloses an energy storage converter system, a converter, and a control method and controller of a bidirectional converter. The control method of the bidirectional converter comprises the steps of subtracting a predetermined feed network current reference value from inductive current of an AC side of an energy storage converter to obtain a deviation signal, modulating the deviation signal through a quasi proportional resonant controller to obtain a voltage benchmark signal; carrying out linear kalman filter processing on feed network current of the AC side of the energy storage converter to obtain state estimation signals of harmonic current in the feed network current; carrying out corresponding gain processing on the state estimation signals of the harmonic current in the feed network current and then subtracting the state estimation signals from the voltage benchmark signal as decrements to obtain a voltage reference signal; and modulating the voltage reference signal through a PWM generator to obtain an SPWM control signal of controlling on and off of a power switch tube of the bidirectional converter. A high-frequency sub-harmonic within 11 times in the current of the AC side of the energy storage converter can be effectively filtered and the quality of output power is improved.

Description

technical field [0001] The invention relates to the technical field of microgrid power conversion, in particular to an energy storage converter system, a converter, and a control method and controller for a bidirectional converter. Background technique [0002] Large-scale abandonment of light and wind has occurred in areas rich in photovoltaic and wind power such as Northwest my country. One of the important reasons is the difficulty in grid connection caused by the unstable output of photovoltaic power generation and wind power generation. At present, the mainstream solution is to equip these photovoltaic power stations or wind farms with energy storage systems of a certain capacity, which can play a buffer role in improving power quality and "reservoir", as well as peak-shaving and valley-filling effects on large power grids. The energy storage system can be connected to the grid or run off the grid, which effectively improves the reliability and security of the power sup...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02J3/32
CPCH02J3/01H02J3/32Y02E40/40
Inventor 吴志鹏姜新宇曾辉许贤昶吴胜兵孙开发
Owner GUANGZHOU ZHIGUANG ELECTRIC CO LTD
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