System and method for controlling dynamic stability of DC bus voltage based on dual-PWM energy accumulating current transformer
A technology of DC bus voltage, energy storage converter, applied in the direction of reducing/preventing power oscillation, etc., can solve the problems of damage to related components, affecting the control effect of the AC side, and heating of the DC bus capacitors.
Active Publication Date: 2014-12-10
FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID +1
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Problems solved by technology
When the dynamic response speed of the grid-side converter cannot meet the active power output fluctuations of the DC-side converter, overvoltage and undervoltage faults will occur on the DC bus, and the high voltage of the DC bus will cause the DC bus capacitor to heat up, break down and Damage to its related components; too low voltage affects the control effect of the AC side
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[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0027] First of all, before describing the embodiments, it is necessary to explain some terms appearing in this text. E.g:
[0028] Herein, terms such as "first" and "second" may be used to describe various elements, but these elements should not be limited by these terms. These terms are only used to distinguish one element from another. Thus, a "first" element could also be termed a "second" element without departing from the teachings of the present inven...
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The invention provides a method for controlling dynamic stability of a DC bus voltage based on a dual-PWM energy accumulating current transformer. The method comprises the steps of comparing an absolute power difference value with a power threshold to output an absolute difference value, dividing the absolute difference value by a network voltage amplitude to obtain a direct-axis current variable quantity, multiplying the direct-axis current variable quantity by a proportionality coefficient to obtain a proportional direct-axis current variable quantity, superposing the proportional direct-axis current variable quantity and an expected direct-axis current value to output a superposed direct-axis current value, dividing an expected reactive power value by the network voltage amplitude to obtain an expected quadrature-axis current value, performing superposing, proportional regulation and integral regulation on the superposed direct-axis current value and the expected quadrature-axis current value, respectively, to obtain an AC-site direct-axis reference voltage and an AC-site quadrature-axis reference voltage, and performing space vector pulse width modulation on the AC-site direct-axis reference voltage and the AC-site quadrature-axis reference voltage to generate a driving signal for controlling the current transformer. The invention also provides a system for controlling the dynamic stability of the DC bus voltage based on the dual-PWM energy accumulating current transformer.
Description
technical field [0001] The invention belongs to the technical field of power electronic frequency converters, and in particular relates to a DC bus voltage dynamic stability control technology suitable for dual PWM type energy storage converters working in grid connection. Background technique [0002] The existing DC bus voltage control system consists of a DC-side converter and a grid-side converter. During grid-connected operation, the main function of the grid-side converter is to realize AC side power factor control and maintain DC link voltage stability. To ensure the reliable operation of the DC-side converter and even the entire energy storage system; the main function of the DC-side converter is to control the magnitude and direction of active power output. [0003] Since the functions of the DC-side converter and the grid-side converter are relatively independent, when a step occurs in the output power, the DC-side converter adjusts the active power output, and the...
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IPC IPC(8): H02J3/24
Inventor 黄小耘郭晓斌黄红远许爱东彭飞进申展李响雷金勇
Owner FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID