CN110333468B - Inversion test correction method applied to rectifier - Google Patents
Inversion test correction method applied to rectifier Download PDFInfo
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- CN110333468B CN110333468B CN201910630778.3A CN201910630778A CN110333468B CN 110333468 B CN110333468 B CN 110333468B CN 201910630778 A CN201910630778 A CN 201910630778A CN 110333468 B CN110333468 B CN 110333468B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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Abstract
The invention discloses an inversion test correction method applied to a rectifier, which comprises the following steps: the method comprises the steps of starting, reading a phase compensation angle through communication, compensating angle amplitude limiting, carrying out phase compensation on a phase-locked loop synchronous signal, calculating the phase difference between the phase-locked loop synchronous signal and a power grid voltage signal, carrying out software phase-locked adjustment, carrying out SPWM output phase frequency adjustment, ending, and observing the measured voltage and current phase difference. The invention can measure the deviation value of the inversion voltage and the network side voltage, after phase compensation, the phase of the network side input current is consistent with that of the power grid voltage.
Description
Technical Field
The invention belongs to the technical field of rectifiers, and particularly relates to an inversion test correction method applied to a rectifier.
Background
The frequency converter is used as a driving device of the motor, and in order to ensure long-term reliable operation of the motor, the output of the frequency converter needs to be kept stable, so that not only is the direct current output of the rectifier required to be stable, but also most of current harmonics are required to be eliminated, and the grid side current is sinusoidal; and the converter operates in unit power factor, improves the efficiency of the rectifier and really realizes 'green electric energy conversion'.
The rectifier applying the SPWM technology has stable direct current and input current distortion degree less than 5% under the condition of rated load, and has good performance, but does not realize unit power factor.
Although the phase-locked loop technology is adopted in software of the existing rectifier, the phase difference of the current tracking voltage is almost 0, the power factor cos phi is approximately equal to 1, and the unit power factor can be realized theoretically. However, due to the influence of the coupling of inductive devices such as a rectifier boost reactor and the like, the software control effect does not reach the expected target, and the power factor is only about 0.8 and does not reach 1.
Disclosure of Invention
The present invention is provided to solve the problems of the prior art, and an object of the present invention is to provide an inversion test calibration method applied to a rectifier.
The technical scheme of the invention is as follows: the inversion test correction method applied to the rectifier comprises the following steps:
start of
Initializing a system;
ii, communication reading phase compensation angle
Reading a phase compensation angle value through a communication mode;
compensating for angle clipping
Judging the compensation angle range: if the angle is more than 360 degrees, the compensation angle is 0; if the angle is larger than 180 degrees, the compensation angle is 180-theta; if the angle is less than 180 degrees, the compensation angle is theta;
iv, phase compensation is carried out on synchronous signals of phase-locked loop
Subtracting the compensation angle value from the counting period value of the synchronous signal;
v. calculating the phase difference between the synchronous signal of the phase-locked loop and the voltage signal of the power grid
Calculating the phase difference between the phase-locked loop synchronous signal and the power grid voltage signal;
vi.software phase-locked regulation
Controlling a software phase-locked loop (PI);
SPWM output phase frequency adjustment
Calculating the SPWM carrier period value and outputting PWM pulses;
viii, end
And observing and measuring the voltage and current phase difference.
The system initialization in the step i comprises system clock initialization, interrupt vector initialization and serial communication interface initialization.
And in the step ii, the phase compensation angle value is subjected to parameter setting through a touch screen connected with the control panel, the measured compensation angle value is input, and the compensation angle value is transmitted to the control panel in a serial port communication mode.
And iv, reading the count value of the capture register, namely the grid voltage period count value, and subtracting the compensation angle value obtained by communication from the grid voltage period count value to obtain an adjusted grid voltage signal.
And in the step V, the power grid voltage is subjected to level conversion through the acquisition circuit of the control board and then converted into a 3.3V square wave signal to be used as a capture signal of the DSP capture unit.
And reading the count value of the time mark register as the count value of the current period signal, and subtracting the adjusted power grid voltage signal from the current period signal to obtain the phase difference QEK.
The PI control in the step vi is proportional-integral control,
XIND＝QEK*KP+∑QEK*KI
wherein KP and KI are respectively proportional and integral coefficients
The output value XIND of the phase difference regulator is added with the counting value of the voltage period of the power grid to obtain the counting value of the current period signal after regulation, the counting value is divided by a carrier ratio 120, the carrier of the counting value is 6k, the counting value of each carrier period, namely the interrupt period of PWM (pulse-width modulation), and phase difference regulation is carried out to realize phase locking of the current signal and the voltage of the power grid so that the phases of the current signal and the voltage of the power grid are consistent.
Step vii, connecting the grounding end of the oscilloscope probe at a zero position by using a dual-channel oscilloscope, respectively testing voltage signals at a point U and a point U1 by using two test points, and measuring the zero crossing point phase difference of the two voltage signals as a compensation angle value, the phase difference between TU-U1 and U, the period value of the T-U1 voltage signal, wherein the compensation angle is 360 TU/T;
after the measurement is carried out according to the method, a dual-channel oscilloscope is adopted, a differential probe is used for measuring the input grid voltage of a rectifier, a current clamp is used for measuring the input current, the phase difference Td between the input grid voltage and the input current of the rectifier and the phase difference between the input grid voltage and the input current of the rectifier are measured, the period value of a T-U1 voltage signal is obtained, the phase difference theta is 360 multiplied by Td/T is 2.89 degrees, the power factor cos theta is calculated to be 0.998 and is approximately equal to 1, and the unit power factor is realized.
The invention can measure the deviation value of the inversion voltage and the network side voltage, after phase compensation, the phase of the network side input current is consistent with that of the power grid voltage.
Drawings
FIG. 1 is a test calibration schematic of the present invention;
FIG. 2 is a test calibration flow chart of the present invention;
wherein:
1 DC input 2 energy storage capacitor
3 three-term output of a rectifier bridge and 4.
Detailed Description
The present invention is described in detail below with reference to the accompanying drawings and examples:
as shown in fig. 1-2, the inversion test correction method applied to the rectifier includes the following steps:
start of
Initializing a system;
ii, communication reading phase compensation angle
Reading a phase compensation angle value through a communication mode;
compensating for angle clipping
Judging the compensation angle range: if the angle is more than 360 degrees, the compensation angle is 0; if the angle is larger than 180 degrees, the compensation angle is 180-theta; if the angle is less than 180 degrees, the compensation angle is theta;
iv, phase compensation is carried out on synchronous signals of phase-locked loop
Subtracting the compensation angle value from the counting period value of the synchronous signal;
v. calculating the phase difference between the synchronous signal of the phase-locked loop and the voltage signal of the power grid
Calculating the phase difference between the phase-locked loop synchronous signal and the power grid voltage signal;
vi.software phase-locked regulation
Controlling a software phase-locked loop (PI);
SPWM output phase frequency adjustment
Calculating the SPWM carrier period value and outputting PWM pulses;
viii, end
And observing and measuring the voltage and current phase difference.
The system initialization in the step i comprises system clock initialization, interrupt vector initialization and serial communication interface initialization.
And in the step ii, the phase compensation angle value is subjected to parameter setting through a touch screen connected with the control panel, the measured compensation angle value is input, and the compensation angle value is transmitted to the control panel in a serial port communication mode.
And iv, reading the count value of the capture register, namely the grid voltage period count value, and subtracting the compensation angle value obtained by communication from the grid voltage period count value to obtain an adjusted grid voltage signal.
And in the step V, the power grid voltage is subjected to level conversion through the acquisition circuit of the control board and then converted into a 3.3V square wave signal to be used as a capture signal of the DSP capture unit.
And reading the count value of the time mark register as the count value of the current period signal, and subtracting the adjusted power grid voltage signal from the current period signal to obtain the phase difference QEK.
The PI control in the step vi is proportional-integral control,
XIND＝QEK*KP+∑QEK*KI
wherein KP and KI are respectively proportional and integral coefficients
The output value XIND of the phase difference regulator is added with the counting value of the voltage period of the power grid to obtain the counting value of the current period signal after regulation, the counting value is divided by a carrier ratio 120, the carrier of the counting value is 6k, the counting value of each carrier period, namely the interrupt period of PWM (pulse-width modulation), and phase difference regulation is carried out to realize phase locking of the current signal and the voltage of the power grid so that the phases of the current signal and the voltage of the power grid are consistent.
Step vii, connecting the grounding end of the oscilloscope probe at a zero position by using a dual-channel oscilloscope, respectively testing voltage signals at a point U and a point U1 by using two test points, and measuring the zero crossing point phase difference of the two voltage signals as a compensation angle value, the phase difference between TU-U1 and U, the period value of the T-U1 voltage signal, wherein the compensation angle is 360 TU/T;
after the measurement is carried out according to the method, a dual-channel oscilloscope is adopted, a differential probe is used for measuring the input grid voltage of a rectifier, a current clamp is used for measuring the input current, the phase difference Td between the input grid voltage and the input current of the rectifier and the phase difference between the input grid voltage and the input current of the rectifier are measured, the period value of a T-U1 voltage signal is obtained, the phase difference theta is 360 multiplied by Td/T is 2.89 degrees, the power factor cos theta is calculated to be 0.998 and is approximately equal to 1, and the unit power factor is realized.
The utility model provides an inversion test correcting unit for rectifier, includes direct current input 1, direct current input 1 and rectifier bridge 3 switch on and be connected with energy storage capacitor 2 at direct current input 1 both ends, rectifier bridge 3 is connected with three output 4, there are detection terminal U, detection terminal V, detection terminal W in three output 4, can observe the wave form of detection terminal U and grid voltage U1, detection terminal V and grid voltage V1, detection terminal W and grid voltage W1 through oscilloscope.
The rectifier bridge 3 comprises three groups of transistors coupled to the dc input 1, the transistors comprising a transistor Sa1Transistor Sa2Transistor Sb1Transistor Sb2Transistor Sc1Transistor Sc2。
Transistor Sa1And transistor Sa2Is connected to the collector of, and a transistor Sa1Transistor Sa2Between which a lead-out wire is connected, the transistor Sa1Emitter and diode Da1Anode connection, diode Da1Cathode and transistor Sa1The collector of said transistor Sa2Emitter and diode Da2Anode connection, diode Da2Cathode and transistor Sa2Is connected to the collector of (a).
Transistor Sb1And transistor Sb2Is connected to the collector of, and a transistor Sb1Transistor Sb2Between which a lead-out wire is connected, the transistor Sb1Emitter and diode Db1Anode connection, diode Db1Cathode and transistor Sb1The collector of said transistor Sb2Emitter and diode Db2Anode connection, diode Db2Cathode and transistor Sb2Is connected to the collector of (a).
Transistor SC1And transistor SC2Is connected to the collector of, and a transistor SC1Transistor SC2Between which a lead-out wire is connected, the transistor SC1Emitter and diode DC1Anode connection, diode DC1Cathode and transistor SC1The collector of said transistor SC2Emitter and diode DC2Anode connection, diode DC2Cathode and transistor SC2Is connected to the collector of (a).
Transistor Sa1Transistor Sa2An inductor L, a resistor R1 and a capacitor C1 are sequentially connected in series on the lead-out wire between the two, and a detection terminal U is positioned between the resistor R1 and the capacitor C1.
Transistor Sb1Transistor Sb2An inductor L, a resistor R2 and a capacitor C2 are sequentially connected in series on the lead-out wire between the two, and a detection terminal V is positioned between the resistor R2 and the capacitor C2.
Transistor SC1Transistor SC2An inductor L, a resistor R3 and a capacitor C3 are sequentially connected in series on the lead-out wire between the two, and a detection terminal W is positioned between the resistor R3 and the capacitor C3.
The grid voltage U1 is between an inductor C4 and a resistor R4 which are connected in series, the grid voltage V1 is between an inductor C5 and a resistor R5 which are connected in series, and the grid voltage W1 is between an inductor C6 and a resistor R6 which are connected in series.
The direct current input 1 is a DC direct current power supply.
The energy storage capacitor 2 is a capacitor C.
The invention can measure the deviation value of the inversion voltage and the network side voltage, after phase compensation, the phase of the network side input current is consistent with that of the power grid voltage.
Claims (8)
1. The inversion test correction method applied to the rectifier is characterized in that: the method comprises the following steps:
starting (i)
Initializing a system;
(ii) communication reading phase compensation angle
Reading a phase compensation angle value through a communication mode;
(iii) compensating for angular clipping
Judging the compensation angle range: if the angle is more than 360 degrees, the compensation angle is 0; if the angle is larger than 180 degrees, the compensation angle is 180-theta; if the angle is less than 180 degrees, the compensation angle is theta;
(iv) phase compensation of the phase locked loop synchronization signal
Subtracting the compensation angle value from the counting period value of the synchronous signal;
(v) phase compensation of grid voltage signals
Subtracting the compensation angle value from the grid voltage signal period count value;
(vi) software phase-locked Regulation
The software phase-locked loop PI control is proportional integral control;
(vii) SPWM output phase frequency adjustment
Calculating the SPWM carrier period value and outputting PWM pulses;
the method comprises the following steps that a dual-channel oscilloscope is adopted, the grounding end of an oscilloscope probe is connected to the zero position, two test points respectively test voltage signals of three output test terminals U and a power grid voltage U1, the zero crossing point phase difference of the two voltage signals is measured and used as a compensation angle value, the phase difference between TU-U1 and U and the period value of T-U1 voltage signals, and the compensation angle is 360 TU/T;
(viii) end
And observing and measuring the voltage and current phase difference.
2. The inversion test correction method applied to the rectifier according to claim 1, wherein: the system initialization in the step (i) comprises system clock initialization, interrupt vector initialization and serial communication interface initialization.
3. The inversion test correction method applied to the rectifier according to claim 1, wherein: and (ii) setting parameters of the phase compensation angle value through a touch screen connected with the control panel, inputting the measured compensation angle value, and transmitting the compensation angle value to the control panel in a serial port communication mode.
4. The inversion test correction method applied to the rectifier according to claim 1, wherein: and (iv) reading the count value of the capture register, namely the grid voltage period count value, and subtracting the compensation angle value obtained by communication from the count value to obtain an adjusted grid voltage signal.
5. The inversion test correction method applied to the rectifier according to claim 1, wherein: and (V) converting the grid voltage into a 3.3V square wave signal after level conversion is carried out on the grid voltage through the acquisition circuit of the control board, and taking the square wave signal as a capture signal of the DSP capture unit.
6. The inversion test correction method applied to the rectifier according to claim 4, wherein: and reading the count value of the time mark register as the count value of the current period signal, and subtracting the adjusted power grid voltage signal from the current period signal to obtain the phase difference QEK.
7. The inversion test correction method applied to the rectifier according to claim 1, wherein: step (vi) proportional-integral control specifically comprises:
XIND=QEK*KP+∑QEK*KI
KP and KI are respectively proportional and integral coefficients;
the phase difference regulator output value XIND is added with the grid voltage period counting value to obtain the regulated current period signal counting value, the current period signal counting value is divided by a carrier ratio 120, the carrier of the carrier ratio is 6 kHZ, the counting value of each carrier period, namely the PWM interruption period, phase locking of the current signal and the grid voltage is achieved through phase difference regulation, and the phase of the current signal and the grid voltage is consistent.
8. The inversion test correction method applied to the rectifier according to claim 1, wherein: after the measurement in the step (vii), a dual-channel oscilloscope is adopted, a differential probe is used for measuring the input grid voltage of a rectifier, a current clamp is used for measuring the input current, the phase difference Td between the input grid voltage and the input current of the rectifier and the phase difference between the input grid voltage and the input current of the rectifier and the period value of a voltage signal T-U1 are measured, the phase difference is obtained to be theta = 360 multiplied by Td/T =2.89 degrees, the power factor cos theta =0.998 is calculated to be approximately equal to 1, and the unit power factor is achieved.
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| CN111900885A (en) * | 2020-07-15 | 2020-11-06 | 国网北京市电力公司 | Control method and device for power supply of transformer area identification testing device |
| CN114814390A (en) * | 2021-01-21 | 2022-07-29 | 核工业理化工程研究院 | Multifunctional frequency converter test platform and test method thereof |
| CN116643082B (en) * | 2023-07-27 | 2024-04-19 | 闽南理工学院 | AC voltage signal non-isolation measuring circuit containing DC bias and measuring method |
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