Intelligent overcurrent protection device capable of preventing inverter subversion and control method thereof
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, not being timely, thyristor distribution, etc., to overcome the noise amplification effect and good filter performance and rapid effect
Inactive Publication Date: 2013-12-25
UNIV OF SCI & TECH BEIJING
View PDF4 Cites 6 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
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
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[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...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention belongs to the field of detection and protection of an AC-DC-AC variable-frequency speed control system and particularly provides an intelligent overcurrent protection device capable of preventing inverter subversion and a control method thereof. The intelligent overcurrent protection device capable of preventing the inverter subversion comprises a digital signal processor which is used for processing signals, a voltage sensor which is used for collecting voltage signals of a circuit, a current sensor which is used for collecting current signals of the circuit, a signal isolating and converting circuit which is used for converting signals sent by the voltage sensor and the current sensor into signals which can be recognized by the digital signal processor, a power part and an IGBT driving board. The control method of the intelligent overcurrent protection device comprises the steps of filtering of the detection amount by means of the rapid tracing differential algorithm and analysis and judgment of the filtered signals by means of the wavelet transform. According to the intelligent overcurrent protection device capable of preventing the inverter subversion and the control method thereof, the disturbed overall fractal index and local fractal index are extracted from a wavelet transform coefficient, the fact that whether a distortion point exists is judged by calculating the modulus maximum of the coefficient, an abnormal type of power grid is positioned accurately, and overcurrent protection of an AC-DC-AC variable-frequency speed control device is achieved through predicting of the inverter subversion.
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...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): H02H7/122
Inventor张勇军张永康苏红月
OwnerUNIV OF SCI & TECH BEIJING