CN108270365B - Method and device for automatically adjusting phase sequence - Google Patents
Method and device for automatically adjusting phase sequence Download PDFInfo
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- CN108270365B CN108270365B CN201810031171.9A CN201810031171A CN108270365B CN 108270365 B CN108270365 B CN 108270365B CN 201810031171 A CN201810031171 A CN 201810031171A CN 108270365 B CN108270365 B CN 108270365B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
Abstract
the invention provides a method and a device for automatically adjusting phase sequence, wherein the method comprises the following steps: 1) before the device is put into operation, detecting the phase sequence of three-phase alternating-current voltage input by an inverter; 2) when the phase sequence is correct, realizing phase locking according to the phase sequence of A, B, C and controlling the inverter to start running; 3) when the phase sequence is incorrect, the phase locking is automatically adjusted, the phase locking is realized according to the phase sequence of A, C, B, and the inverter is controlled to start to operate according to the phase sequence of A, C, B. The problems that in the prior art, the self-adaptive adjustment process of the phase sequence is complex, and the time delay exists in the adjustment process are solved.
Description
Technical Field
the invention relates to a method and a device for automatically adjusting a phase sequence, and belongs to the technical field of converter control.
Background
The phase sequence is an important component of three-phase alternating current phase information, the control of an inverter is usually designed on the premise that the voltage of a power grid is in a positive sequence, if the grid-side wiring of a converter is wrong or the phase sequence of the power grid is changed, a control system cannot obtain correct phase information, a control link is wrong, and a device cannot work normally.
When the phase sequence is wrong, the conventional method is to measure the phase sequence by using a phase sequence detector, verify that the phase sequence is a positive sequence, and then put the phase sequence into work.
In the phase sequence adaptive control research of a grid-connected inverter, which is published in electromechanical engineering of 12 months in 2013 by the jiayuhong and the like, a phase sequence adaptive control method is applied to the control of a converter, the basic principle of a three-phase digital phase-locked loop is analyzed, the relation between a phase sequence and synchronous rotation transformation is obtained on the basis of a synchronous rotation transformation result under the condition of summarizing a positive sequence and a negative sequence, a phase sequence detection method is provided, a phase sequence adaptive control algorithm is designed, a phase sequence adaptive grid-connected control strategy of the inverter is realized by utilizing DSP TMS320F2812 programming, however, when the phase sequence adaptive control of the inverter is realized, an error obtained by subtracting a voltage U dc measured by a direct current side U dcref and a voltage sensor is sent to an electric PI controller, a phase sequence mark SIGN is output and multiplied as an active current I qref, a current given value and I d and I q obtained by coordinate transformation of three-phase network current measured by the current sensor are sent to the PI controller, an error is sent to the PI controller, a current given value and a current given value and a current ring PI controller is output to a current.
disclosure of Invention
The invention relates to a method and a device for automatically adjusting a phase sequence, which solve the problems that the phase sequence self-adaptive adjustment process is complex and time delay exists in the adjustment process in the prior art.
in order to achieve the above purpose, the first solution: the invention provides a method for automatically adjusting phase sequence, which comprises the following steps:
1) Before the device is put into operation, detecting the phase sequence of three-phase alternating-current voltage input by an inverter;
2) When the phase sequence is correct, realizing phase locking according to the phase sequence of A, B, C and controlling the inverter to start running;
3) When the phase sequence is incorrect, the phase locking is automatically adjusted, the phase locking is realized according to the phase sequence of A, C, B, and the inverter is controlled to start to operate according to the phase sequence of A, C, B.
Scheme II: on the basis of the first scheme, in the step 1), the phase sequence of the three-phase alternating current power grid is detected by adopting a synchronous rotation transformed digital phase-locked loop.
And on the basis of the second scheme, the method for detecting the phase sequence of the digital phase-locked loop of the synchronous rotation transformation comprises the steps of carrying out CLARKE transformation and forward and reverse PARK transformation on the input three-phase voltage of the inverter to obtain U d +, U q +, U d and U q -, carrying out closed-loop operation on a positive-sequence q-axis component U q + to obtain an angle value theta corresponding to a positive-sequence component of the grid voltage, carrying out closed-loop control on the angle value theta, calculating the average value of a grid voltage d axis of 2 grid periods, judging that the phase sequence is correct if the average value of the d axis is a grid voltage peak value, and judging that the phase sequence is wrong if the average value is smaller than 0.1 time of a rated value.
And the scheme is as follows: on the basis of the first scheme, in the step 2), the phase-locked loop is controlled to perform CLARKE conversion and forward and reverse PARK conversion on the three-phase voltage and current according to the phase sequence of A, B, C, and the modulated wave is compared with the carrier wave according to the phase sequence of A, B, C to generate the PWM wave.
And a fifth scheme: on the basis of the first scheme, in the step 3), the phase-locked loop is controlled to perform CLARKE conversion and forward and reverse PARK conversion on the three-phase voltage and current according to the phase sequence of A, C, B, and the modulated wave is compared with the carrier wave according to the phase sequence of A, C, B to generate the PWM wave.
scheme six: the invention also provides a device for automatically adjusting the phase sequence, which comprises a processor and a memory, wherein the processor executes the instructions stored by the memory to realize the following method:
1) before the device is put into operation, detecting the phase sequence of three-phase alternating-current voltage input by an inverter;
2) When the phase sequence is correct, realizing phase locking according to the phase sequence of A, B, C and controlling the inverter to start running;
3) when the phase sequence is incorrect, the phase locking is automatically adjusted, the phase locking is realized according to the phase sequence of A, C, B, and the inverter is controlled to start to operate according to the phase sequence of A, C, B.
The scheme is seven: on the basis of the sixth scheme, in the step 1), the phase sequence of the three-phase alternating current power grid is detected by adopting a synchronous rotation transformed digital phase-locked loop.
The method for detecting the phase sequence of the digital phase-locked loop based on the synchronous rotation transformation comprises the steps of carrying out CLARKE transformation and forward and reverse PARK transformation on the input three-phase voltage of the inverter to obtain U d +, U q +, U d and U q -, carrying out closed-loop operation on a positive-sequence q-axis component U q + to obtain an angle value theta corresponding to a positive-sequence component of the grid voltage, carrying out closed-loop control on the angle value theta, calculating the average value of grid voltage d axes of 2 grid periods, judging that the phase sequence is correct if the average value of the d axes is a grid voltage peak value, and judging that the phase sequence is wrong if the average value is smaller than 0.1 time of a rated value.
The scheme is nine: on the basis of the sixth scheme, in the step 2), the phase-locked loop is controlled to perform CLARKE conversion and forward and reverse PARK conversion on the three-phase voltage and current according to the phase sequence of A, B, C, and the modulated wave is compared with the carrier wave according to the phase sequence of A, B, C to generate the PWM wave.
and a scheme ten: on the basis of the sixth scheme, in the step 3), the phase-locked loop is controlled to perform CLARKE conversion and forward and reverse PARK conversion on the three-phase voltage and current according to the phase sequence of A, C, B, and the modulated wave is compared with the carrier wave according to the phase sequence of A, C, B to generate the PWM wave.
according to the invention, after the phase sequence is judged to be correct, different processing flows are adopted, when the phase sequence is detected to be incorrect, the phase locking is carried out on the three-phase voltage and the three-phase current according to the phase sequence of A, C, B, the modulation wave is controlled to be compared with the carrier wave according to the phase sequence of A, C, B, the PWM wave is generated, and the inverter is controlled to be started. The method has the advantages of realizing simple and quick automatic phase sequence adjustment, effectively reducing the complexity of a control system, improving the automatic control efficiency of the system, along with simple adjustment process, difficulty in error and enhanced system reliability.
Drawings
FIG. 1 is a schematic diagram of a converter unbalanced phase locking algorithm;
Fig. 2 is a flow chart of a method for automatically adjusting the phase sequence of the converter.
Detailed Description
the technical scheme of the invention is further explained in detail by combining the attached drawings:
As shown in fig. 2, the present invention provides an automatic phase sequence adjustment method, which includes the following steps:
1) Before the device is put into operation, detecting the phase sequence of three-phase alternating-current voltage input by an inverter;
2) When the phase sequence is correct, the phase locking is realized according to the phase sequence of A, B, C and the inverter is controlled to start;
3) When the phase sequence is incorrect, the phase locking is automatically adjusted, the phase locking is realized according to the phase sequence of A, C, B, and the inverter is controlled to start according to the phase sequence of A, C, B.
Specifically, in step 1), before the device is put into operation, as shown in fig. 1, a digital phase-locked loop based on synchronous rotation conversion quickly detects the phase sequence of a three-phase alternating current power grid, carries out CLARKE conversion and forward and reverse PARK conversion on the three-phase voltage input by an inverter to obtain U d +, U q +, U d and U q +, carries out closed-loop operation on a positive sequence q-axis component U q + to obtain an angle value theta corresponding to a positive sequence component of the power grid voltage, carries out closed-loop control on an average value of a power grid voltage d axis of 2 power grid periods, and judges whether the phase sequence is correct according to the average value:
If the average value of the d axis is the peak value of the voltage of the power grid, the phase sequence is correct;
If the d-axis component is in sinusoidal variation, the average value of 2 grid cycles is less than 0.1 time of the rated value, and the phase sequence error is judged.
In the method, the average value of the d-axis of the grid voltage in 2 periods is calculated to judge whether the phase sequence is correct, but the method for detecting whether the phase sequence is correct is only one embodiment adopted in the invention, the invention is not limited to the method, for example, the positive sequence synchronous rotation transformation can be carried out on the three-phase input voltage, when the three-phase input voltage is stable, if the active q-axis component is negative, the three-phase sequence is judged to be positive, and if the phase sequence is wrong, the dq-axis component is the alternating current of twice the grid frequency. Or equivalently synthesizing a proper amount of rotation angle according to the three-phase alternating voltage, and judging whether the phase sequence is a positive sequence; or detecting the actual grid voltage phase angle, if the phase angle is larger than 2 pi, judging that the phase sequence is correct, and if the phase angle is smaller than 0, judging that the phase sequence is wrong.
in step 2) of this embodiment, when the phase sequence is correct, Clarke and Park conversion is performed on the network side voltage acquired by the phase-locked loop according to the sequence of Ua, Ub and Uc, and Clarke and Park conversion is performed on the three-phase current according to Ia, Ib and Ic, so as to realize phase locking; the modulation wave is compared with the carrier wave according to the sequence of Ta, Tb and Tc to generate a PWM wave;
in step 3), when the phase sequence is wrong, automatically adjusting the phase lock to enable the control algorithm to correspond to the phase sequence: the network side voltage acquired by the phase-locked loop is subjected to Clarke and Park conversion according to the sequence of Ua, Uc and Ub, and the three-phase current is subjected to Clarke and Park conversion according to Ia, Ic and Ib so as to realize phase locking; the modulated wave is compared with the carrier wave in the order of Ta, Tc and Tb to generate a PWM wave.
In the above steps 2) and 3), the PWM wave is obtained by comparing the modulation wave with the carrier wave to drive the inverter to start up, however, in the present invention, the PWM signal may be generated by an equal pulse width PWM method, an equal area method, a software generation method, etc., but when the phase sequence is judged to be wrong, the steps are performed in the order of the phase a, the phase C, and the phase B as described in the present invention.
Further, on the basis of the above method, the present invention also provides an apparatus for automatically adjusting phase sequence, which includes a processor and a memory, wherein the processor executes instructions stored by the memory to implement the following method:
1) before the device is put into operation, detecting the phase sequence of three-phase alternating-current voltage input by an inverter;
2) When the phase sequence is correct, realizing phase locking according to the phase sequence of A, B, C and controlling the inverter to start running;
3) When the phase sequence is incorrect, the phase locking is automatically adjusted, the phase locking is realized according to the phase sequence of A, C, B, and the inverter is controlled to start to operate according to the phase sequence of A, C, B.
the specific embodiments are given above, but the present invention is not limited to the described embodiments. The basic idea of the present invention lies in the above basic scheme, and it is obvious to those skilled in the art that no creative effort is needed to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (6)
1. a method for automatically adjusting phase sequence is characterized by comprising the following steps:
1) Before the device is put into operation, detecting the phase sequence of three-phase alternating-current voltage input by an inverter;
2) When the phase sequence is correct, realizing phase locking according to the phase sequence of A, B, C and controlling the inverter to start running;
3) when the phase sequence is incorrect, automatically adjusting the phase lock, realizing the phase lock according to the phase sequence of A, C, B, and controlling the inverter to start and operate according to the phase sequence of A, C, B;
In the step 1), detecting the phase sequence of the three-phase alternating current power grid by adopting a synchronous rotation transformed digital phase-locked loop;
the method for detecting the phase sequence of the digital phase-locked loop with synchronous rotation conversion comprises the steps of carrying out CLARKE conversion and forward and reverse PARK conversion on three-phase voltage input by an inverter to obtain U d +, U q +, U d and U q +, carrying out closed-loop operation on a positive sequence q-axis component U q + to obtain an angle value theta corresponding to a grid voltage positive sequence component, carrying out closed-loop control on the angle value theta, calculating the average value of a grid voltage d-axis of 2 grid periods, judging that the phase sequence is correct if the average value of the d-axis is a grid voltage peak value, and judging that the phase sequence is wrong if the average value is smaller than 0.1 time of a rated value.
2. the method for automatically adjusting the phase sequence as claimed in claim 1, wherein in step 2), the phase-locked loop is controlled to perform CLARKE transformation and forward and reverse PARK transformation on the three-phase voltage and current according to the phase sequence of A, B, C, and the modulated wave is compared with the carrier wave according to the phase sequence of A, B, C to generate the PWM wave.
3. the method for automatically adjusting the phase sequence as claimed in claim 1, wherein in step 3), the phase-locked loop is controlled to perform CLARKE transformation and forward and reverse PARK transformation on the three-phase voltage and current according to the phase sequence of A, C, B, and the modulated wave is compared with the carrier wave according to the phase sequence of A, C, B to generate the PWM wave.
4. An apparatus for automatically adjusting phase sequence, comprising a processor and a memory, wherein the processor executes instructions stored by the memory to implement the method of:
1) before the device is put into operation, detecting the phase sequence of three-phase alternating-current voltage input by an inverter;
2) When the phase sequence is correct, realizing phase locking according to the phase sequence of A, B, C and controlling the inverter to start running;
3) When the phase sequence is incorrect, automatically adjusting the phase lock, realizing the phase lock according to the phase sequence of A, C, B, and controlling the inverter to start and operate according to the phase sequence of A, C, B;
In the step 1), detecting the phase sequence of the three-phase alternating current power grid by adopting a synchronous rotation transformed digital phase-locked loop;
the method for detecting the phase sequence of the digital phase-locked loop with synchronous rotation conversion comprises the steps of carrying out CLARKE conversion and forward and reverse PARK conversion on three-phase voltage input by an inverter to obtain U d +, U q +, U d and U q +, carrying out closed-loop operation on a positive sequence q-axis component U q + to obtain an angle value theta corresponding to a grid voltage positive sequence component, carrying out closed-loop control on the angle value theta, calculating the average value of a grid voltage d-axis of 2 grid periods, judging that the phase sequence is correct if the average value of the d-axis is a grid voltage peak value, and judging that the phase sequence is wrong if the average value is smaller than 0.1 time of a rated value.
5. The device as claimed in claim 4, wherein in step 2), the phase-locked loop is controlled to perform CLARKE conversion and forward and reverse PARK conversion on the three-phase voltage and current according to the phase sequence of A, B, C, and the modulated wave is compared with the carrier wave according to the phase sequence of A, B, C to generate the PWM wave.
6. The device as claimed in claim 4, wherein in step 3), the phase-locked loop is controlled to perform CLARKE conversion and forward and reverse PARK conversion on the three-phase voltage and current according to the phase sequence of A, C, B, and the modulated wave is compared with the carrier wave according to the phase sequence of A, C, B to generate the PWM wave.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110412364B (en) * | 2019-07-26 | 2021-04-16 | 中冶赛迪电气技术有限公司 | Software-based phase loss detection method |
| CN114629178A (en) | 2020-12-14 | 2022-06-14 | 台达电子工业股份有限公司 | Phase sequence adjusting system and phase sequence adjusting method |
| CN112531784B (en) * | 2020-12-14 | 2022-08-19 | 浙江艾罗网络能源技术股份有限公司 | Phase-sequence self-adaptive phase-locking and inversion control method for three-phase power grid |
| CN113281677A (en) * | 2021-04-08 | 2021-08-20 | 珠海格力电器股份有限公司 | Wiring detection method, device, equipment, variable frequency control circuit and system |
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| CN106872808A (en) * | 2017-03-20 | 2017-06-20 | 南京理工大学 | A kind of three-phase voltage phase-lock-loop algorithm of phase sequence self-adaption |
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| CN204271655U (en) * | 2014-11-25 | 2015-04-15 | 北京博旺天成科技发展有限公司 | With the active reacance generator of phase sequence self-adaption function |
| CN105896539A (en) * | 2014-11-25 | 2016-08-24 | 江苏博力电气科技有限公司 | Phase sequence identification adaptive method applied to electric energy quality management device |
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Effective date of registration: 20221101 Address after: No. 4138, Sunshine Avenue, Xuchang Economic Development Zone, Henan 461000 Patentee after: Henan Xuji Power Electronics Co.,Ltd. Patentee after: XJ ELECTRIC Co.,Ltd. Patentee after: XJ Group Corp. Address before: No. 1298 Xuchang City, Henan province 461000 XJ Avenue Patentee before: XJ ELECTRIC Co.,Ltd. Patentee before: XJ Group Corp. |
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