Active power filter (APF) hysteresis space vector pulse width modulation (SVPWM) fault tolerance control method under synchronous rotating coordinate system
A technology of synchronous rotation and fault-tolerant control, applied in the direction of output power conversion devices, electrical components, active power filtering, etc., can solve the problems of reduced controllability and inability to continue to use, so as to improve the quality of harmonic compensation and strengthen the practical Application value, effect of reducing the influence of compensation accuracy
Active Publication Date: 2018-03-02
LIAONING TECHNICAL UNIVERSITY
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However, when the APF performs fault-tolerant control, the main circuit is switched from a three-phase six-switch inverter to a three-phase four-switch inverter; at the same time, the effective voltage vectors of the inverter are also reduced from the original 6 to 4 , the degree of controllability is significantly reduced, resulting in the traditional hysteresis SVPWM strategy applied to the three-phase six-switch APF can no longer be used
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[0045] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0046] An APF hysteresis SVPWM fault-tolerant control method under a synchronous rotating coordinate system, such as figure 1 shown, including the following steps:
[0047] Step 1: During the operation of the active power filter, when a power electronic device in the inverter of the active power filter is open or disconnected, connect its corresponding phase output terminal to the midpoint of the DC side of the inverter.
[0048] like figure 2 As shown, the three-phase power grid supplies power to the resistive load on the DC side through the uncontrollable rectifier circuit, and uses the active power filter to compensate the harmonic component in the AC side current of the rectifier; in this embodiment, the active power filter (APF) It takes dual DSPTMS320F2812 as the core, and uses dual-port ram IDT70V24s15 to realize the communicatio...
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The present invention provides an APF hysteresis SVPWM fault tolerance control method under a synchronous rotating coordinate system. The method comprises the steps of when an electric power electronic device in an inverter of an APF is faulted, connecting the output end of a corresponding phase with a DC side midpoint of the inverter; determining an active power current component when the APF isfaulted; transforming the three-phase load currents into a load current d-axis component and a load current q-axis component under a fundamental wave synchronous rotating coordinate system, and obtaining a d-axis error state parameter and a q-axis error state parameter; adopting a hysteresis SVPWM fault tolerance control method to determine a voltage vector outputted by the APF; according to the voltage vector outputted by the APF, determining the on-off state of the three-phase four-switch inverter corresponding to the faulted APF, and controlling the on-off of a power switch device of the inverter. The method of the present invention enables the influence of a system parameter error on the compensation precision to be reduced and the harmonic compensation quality to be improved, and hasa stronger actual application value.
Description
technical field [0001] The invention belongs to the technical field of active power filters, and in particular relates to an APF hysteresis loop SVPWM fault-tolerant control method under a synchronous rotating coordinate system. Background technique [0002] At present, the research on fault-tolerant control of Active Power Filter (APF) mainly focuses on two aspects: fault diagnosis strategy and current tracking control method under fault state. When a switching device in the three-phase six-switch APF main circuit fails, first use the fault diagnosis strategy to determine the fault location, quickly cut off the fault phase; and transfer the output end of the fault phase to the DC side of the inverter At this point, the original three-phase six-switch inverter is equivalent to a three-phase four-switch inverter. [0003] Among them, the current tracking control in the fault state is to use the three-phase four-switch inverter in the fault state to complete the real-time tra...
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Login to View More IPC IPC(8): H02J3/01H02M7/5387
CPCH02J3/01H02M7/53875H02M1/325H02M7/53876Y02E40/20
Inventor 李国华刘艳丽张美金郭明飞刘佳新
Owner LIAONING TECHNICAL UNIVERSITY