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Dual-PWM variable frequency power supply feedback energy processing device and method

A variable frequency power supply and energy processing technology, which is applied to output power conversion devices, electrical components, and AC power input to AC power output. To achieve the effect of low cost, avoidance of failure, safe and reliable operation

Inactive Publication Date: 2019-07-05
SHANDONG HUATE MAGNET TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method solves the problems of energy waste and low efficiency of dynamic braking; however, it increases the hardware cost, easily forms a current loop, and the energy cannot flow well in both directions between the grid side and the load side.

Method used

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  • Dual-PWM variable frequency power supply feedback energy processing device and method
  • Dual-PWM variable frequency power supply feedback energy processing device and method
  • Dual-PWM variable frequency power supply feedback energy processing device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as figure 1 , figure 2 with image 3 As shown, a dual PWM variable frequency power supply feedback energy processing device. The variable frequency power supply includes a PWM rectifier 4, an intermediate link 3, a PWM inverter 2 and a controller. In this example, the controller is a DSP controller, preferably TMS320F28335; the controllers are respectively The drive isolation and protection circuit is electrically connected to the PWM rectifier 4 and the PWM inverter 2. The drive circuit includes an IGBT drive circuit composed of IR2110 chips. The input end of the drive circuit is connected to the controller, and the output end is connected to the PWM rectifier 4 and the PWM inverter. 2; Intermediate link 3 includes two serially connected DC bus capacitors C1 and C2, a voltage equalizing resistor R1 connected in parallel with C1, and a voltage equalizing resistor R2 connected in parallel with C2.

[0037] The processing device of the present invention includes a signa...

Embodiment 2

[0047] Such as figure 1 , figure 2 , image 3 with Figure 4 As shown, the dual PWM variable frequency power supply feedback energy processing method is applied to the dual PWM variable frequency power supply. The variable frequency power supply includes a PWM rectifier 4 and an intermediate link 3. The two ends of the intermediate link 3 are connected in parallel with a braking resistor R for consuming the feedback energy.

[0048] The processing method includes the following steps:

[0049] Step S1: Obtain the DC bus voltage. In this example, the ADC signal acquisition circuit collects the voltage at the connection point 1 of the two series-connected DC bus capacitors. Other methods can be used for acquisition;

[0050] Step S2: Determine whether the DC bus voltage matches the set threshold Ua and / or threshold Ub;

[0051] Step S3. If yes, generate a corresponding control signal;

[0052] Step S4: Control the PWM rectifier 4 to switch between the rectification and active inverter st...

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Abstract

The invention discloses a dual-PWM variable frequency power supply feedback energy processing device and method, wherein the device comprises a signal collection circuit and a braking unit, and the signal collection circuit is electrically connected with a connection point of two serially connected DC bus capacitors; the braking unit comprises a braking resistor, and the braking unit is connectedin parallel with the two serially connected DC bus capacitors; the braking unit and / or the signal collection circuit is electrically connected with a controller respectively. During the operation, thesignal collection circuit collects a DC bus voltage in real time and transmits the DC bus voltage to the controller, the controller compares the DC bus voltage with a preset threshold Ua and / or a preset threshold Ub, and controls a PWM rectifier to switch between a rectifying state and an active insertion state or stop working, or / and controls braking current to flow by the braking resistor or not according to the comparison result, thereby realizing the two-way flow of the energy between a power grid side and a load side and avoiding faults caused by the feedback energy, the operation is safe and reliable, and the cost is low.

Description

Technical field [0001] The invention relates to the technical field of variable frequency power supplies, in particular to a dual PWM variable frequency power supply feedback energy processing device and method. Background technique [0002] Such as figure 1 As shown, the voltage-type AC-DC-AC variable frequency power supply used by the electromagnetic stirrer usually includes a PWM rectifier 4, an intermediate link 3 and a PWM inverter 2. Among them, PWM rectifier 4 includes a rectifier bridge composed of power devices IGBTs (VT11 and VT14, VT13 and VT16, VT15 and VT12); PWM inverter 2 includes power devices IGBTs (VT21 and VT24, VT23 and VT26, VT25 and VT22) constitute an inverter bridge; the intermediate link 3 includes two series-connected DC bus capacitors (C1 and C2) and voltage equalizing resistors (R1 and R2). The DC bus energy storage capacitor is used to stabilize the DC voltage and equalize the voltage The resistance is used to realize the voltage equalization of the ...

Claims

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Application Information

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IPC IPC(8): H02M5/458H02M7/797
CPCH02M5/4585H02M7/797
Inventor 刘梅姚振民刘风亮李光叶马长君王成业
Owner SHANDONG HUATE MAGNET TECH
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