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A second harmonic current compensator and its control method

A second harmonic and current compensation technology, which is applied in the direction of electrical components, DC power input conversion to DC power output, output power conversion devices, etc., can solve the problem of increased compensator loss, the influence of second harmonic current compensation effects, Problems such as unfavorable working performance of the second harmonic current DC input source, etc., to achieve good second harmonic current compensation effect, stable and reliable work effect

Inactive Publication Date: 2017-08-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second harmonic current will adversely affect the performance of the DC load or DC input source
However, the compensation effect of the second harmonic current is also affected by the ambient temperature and load size
Due to the indirect energy transfer between the load side and the energy storage capacitor side, the loss of the compensator will increase slightly

Method used

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  • A second harmonic current compensator and its control method
  • A second harmonic current compensator and its control method
  • A second harmonic current compensator and its control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] attached figure 1 The main power circuit topology of the second harmonic current compensator without electrolytic capacitor proposed by the present invention is given. It adopts a synchronous rectification Buck converter, and the switching tube Q a1 , Q a2 , filter inductance L s and storage capacitor C s composition. Among them, the switching tube Q a1 is the supervisor, connected to the positive pole of the input voltage of the compensator and the filter inductance L s between; switching tube Q a2 Is the auxiliary pipe, connected to Q a1 between the source of the input voltage and the negative pole of the input voltage; the energy storage capacitor C s Connected to the filter inductor L s Between and the negative pole of the input voltage, the capacitor type is a long-life film capacitor. According to the change law of the voltage across the energy storage capacitor, the working mode of the compensator can be divided into charging mode and discharging mode. ...

Embodiment 2

[0080] Embodiment two: (existing control method compares with control method of the present invention)

[0081] Figure 3-1 , 3-2 gives the main working waveform when the compensator adopts the existing basic single-cycle control method, Figure 3-1 , The solid line in 3-2 is the working waveform under steady-state working conditions, and the dashed line is the working waveform after adding disturbance to the inductor current. It can be seen from Figure 3 that in charging mode (attached Figure 3-1 ), the compensator converges to the disturbance of the inductor current and can work stably. This is because when the inductor current increases (or decreases) in the positive direction, i Qa1 Then increase (or decrease) positively, i Qa1_fb的 Integral value i int will reach base i earlier (or later) ref , making supervisor Q a1 The duty cycle decreases (or increases), and the auxiliary pipe Q a2 The duty cycle increases (or decreases). Since the inductor current flows throu...

Embodiment 3

[0099] attached Figure 5 The schematic diagram of the control circuit of the single-cycle control method of the present invention is given. attached by Figure 5 It can be seen that the control circuit includes a single-cycle controller, a first adder, a second adder, a divider, a multiplier and a voltage regulator. The specific connection method is: the first adder is composed of operational amplifier 1#, resistor R 1 , R 2 , R 3 and R 4 Composed of, where, R 1 One end of R is connected to the inverting input of op amp 1#, and the other end is grounded; R 2 One end of R is connected to the non-inverting input of operational amplifier 1#, and the other end is connected to the current sampling circuit in the main power circuit; R 3 One end is connected to the non-inverting input end of op amp 1#, and the other end is connected to the sampling bias voltage i sbais ; 4 Connected between the inverting input and output of operational amplifier 1#; the output of the first a...

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Abstract

The invention provides a second harmonic current compensator and a control method thereof; the second harmonic current compensator comprises a main power circuit and a control circuit; the main power circuit comprises a synchronization rectification Buck converter, an input voltage sampling circuit, an output voltage sampling circuit and a current sampling circuit; the control circuit comprises a single period controller, a first adder, a second adder, a divider, a multiplier and a voltage regulator; the second harmonic current compensator uses the proposed improved single period control method; the control method uses a sum of a synchronization rectification Buck converter main pipe current sampling signal and a sampling offset voltage to serve as a single period control variable, and uses a sum of a compensator absorbed or provided second harmonic current, an output of the voltage regulator and a reference offset voltage to serve as a single period control variable reference, so the compensator can stably and reliably work, thus having good second harmonic current compensation effect without being affected by work conditions.

Description

technical field [0001] The invention relates to a second harmonic current compensator, which can be used to absorb the second harmonic current in the output current of the PFC converter or provide the second harmonic current in the input current of the inverter, belonging to the power electronics Transformation and control technology field. Background technique [0002] Single-phase power factor correction (PFC) converters and single-phase inverters are widely used in small and medium power applications. The single-phase PFC converter is a power conversion device connected between the AC input source and the DC load, while the single-phase inverter The converter is an important interface connecting the DC input source with the AC load or the AC grid. [0003] For a single-phase PFC converter, its instantaneous input power pulsates at twice the frequency of the input voltage, and since the output is a flat voltage, there is a pulsating current at twice the frequency of the o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/14
CPCH02M1/143H02M3/158
Inventor 张力阮新波任小永
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS