An intelligent overcurrent protection device and its control method for preventing inverter subversion
A technology of overcurrent protection and inverter subversion, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of burning fast fuses or thyristors, failing to turn on or turn off in time, and to overcome noise amplification effects, good filtering and fast
Inactive Publication Date: 2015-08-26
UNIV OF SCI & TECH BEIJING
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Problems solved by technology
When the system is running in the feedback state, if there is an abnormal situation, there is a possibility of commutation failure, which will lead to overcurrent of the thyristor and the inverter subversion of the main circuit. In severe cases, the fast fuse or thyristor will be burned
The specific situations that lead to the above phenomenon are as follows: 1) Abnormal power supply grid on the AC side, such as phase loss or large fluctuations; 2) The phase shift angle of the rectifier feedback device is too small; 3) The grounding of the motor side winding causes DC bus voltage dip
4) The thyristor device fails and cannot be turned on or off normally; 5) The thyristor trigger circuit is unreliable and cannot distribute pulses to each thyristor in a timely and accurate manner, such as pulse loss, pulse delay, etc., resulting in the failure of the rectifier feedback device to be replaced normally. Mutually
However, the full-control device is expensive, especially in high-power systems, and a large number of thyristor rectifier feedback devices in operation cannot be upgraded in a short time
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[0025] Specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0026] Such as figure 1 As shown, the traditional AC-DC-AC frequency conversion speed regulation system includes a rectification / feedback device (R / RF), a common DC bus, an inverter device (INV) and an AC motor. The intelligent overcurrent protection unit (IRPU) is installed on the positive voltage copper bar of the common DC bus. The power part of the intelligent overcurrent protection device (IRPU) and the driver board constitute the hardware real-time protection of the system overcurrent protection, which plays the role of cutting off the DC bus current; the digital signal processor (DSP) of the intelligent overcurrent protection device (IRPU) , voltage and current sensors on the grid side and DC side, signal isolation transformation and corresponding control algorithms are composed of real-time software protection for system over-current p...
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The invention belongs to the field of detection and protection of AC-DC-AC frequency conversion speed regulation systems, and in particular proposes an intelligent overcurrent protection device and control method for preventing inverter subversion. The device includes a digital signal processor for processing signals, and a A voltage sensor for the circuit voltage signal, a current sensor for collecting the circuit current signal, a signal isolation conversion circuit for converting the signal from the voltage and current sensor to a range recognizable by the digital signal processor, the power part and the IGBT driver board . The control method includes fast tracking differential algorithm to filter the detected quantity and using wavelet transform to analyze and judge the filtered signal. Extract the global fractal index and local fractal index of the disturbance from the wavelet transformation coefficient, and judge whether there is a distortion point by calculating the modulus maximum value of the coefficient, accurately locate the abnormal type of the power grid, and realize AC-DC-AC frequency conversion through the prediction of inverter subversion Overcurrent protection of the governor.
Description
technical field [0001] The invention belongs to the field of detection and protection of AC-DC-AC frequency conversion speed regulation systems, and in particular proposes an intelligent overcurrent protection device (Intelligent Rectifiers Protection Unit, IRPU) and a control method for preventing inverter subversion. Background technique [0002] The voltage-type AC-DC-AC frequency conversion speed control device with a common DC bus has the advantages of a small number of grid-side power circuits and effective use of load braking power generation energy, etc., and is widely used in industrial production. Its main circuit is composed of a rectification feedback device, an intermediate circuit energy storage capacitor and an inverter device. The rectification feedback device can be composed of an active front-end rectification circuit composed of a power device that can be turned off, or can be composed of two groups of thyristors connected in antiparallel. control rectifie...
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IPC IPC(8): H02H7/122
Inventor张勇军张永康苏红月
OwnerUNIV OF SCI & TECH BEIJING