CN111030474B - High-voltage cascading harmonic power supply device and control method - Google Patents
High-voltage cascading harmonic power supply device and control method Download PDFInfo
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- CN111030474B CN111030474B CN201911370454.7A CN201911370454A CN111030474B CN 111030474 B CN111030474 B CN 111030474B CN 201911370454 A CN201911370454 A CN 201911370454A CN 111030474 B CN111030474 B CN 111030474B
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0012—Control circuits using digital or numerical techniques
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention provides a high-voltage cascaded harmonic power supply device and a control method, wherein the high-voltage cascaded harmonic power supply device comprises a phase-shifting transformer, a cascaded H-bridge power unit and an output filter unit; the H-bridge power unit comprises an input three-phase rectifier bridge, a direct-current capacitor, an output H-bridge structure and a control system from input to output; the output filtering unit comprises a reactor and a filtering capacitor filtering part; the output harmonic range is 2-50 times of harmonic, the maximum voltage of the output harmonic is 10% of the rated voltage, and two paths of harmonic can be output at the same time. The three-phase fundamental wave voltage rated range is 0-10 kv, the voltage overload capacity is 1.35 times, high-pass 1.35 times, low-pass 1.25 times and zero-pass tests of the three-phase voltage can be carried out by using the equipment, and the three-phase symmetrical low-pass 20% rated voltage waveform of the low-pass test can be carried out.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a harmonic power supply device for high-voltage cascading and a control method.
Background
Harmonic suppression and harmonic compensation have been widely studied and applied domestically. But voltage harmonic research in the high voltage domain is limited by the function of the harmonic source. Meanwhile, the high-voltage and low-voltage pass tests in the reactive compensation field are also limited by the control of a power supply, and the high-voltage power grid is basically impossible to finish the high-voltage pass and low-voltage pass tests, so that the device can solve the problem that a harmonic source is absent in the harmonic compensation field, and can be suitable for voltage fluctuation and frequency change tests of the high-voltage and low-voltage pass test part.
When a transformer in a power supply system converts or isolates voltage levels, direct current magnetic bias can be caused when a direct current component is output by a power supply or an inverter adopting an SPWM control technology, a transformer core can be saturated, and output distortion or equipment damage can be caused when loss is increased.
The invention is under the background, and the research work of the technology is developed under the support of the existing theoretical research.
Disclosure of Invention
In order to solve the problems of the background technology, the high-voltage cascading harmonic power supply device and the control method provided by the invention are suitable for the research in the field of high-voltage harmonic suppression and the high-voltage high-low penetration test.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
a high-voltage cascade harmonic power supply device comprises a phase-shifting transformer 380V-690V, a cascade H-bridge power unit and an output filter unit; the H-bridge power unit comprises an input three-phase rectifier bridge, a direct-current capacitor, an output H-bridge structure and a control system from input to output;
the output filtering unit comprises a reactor and a filtering capacitor filtering part; the output harmonic range is 2-50 times of harmonic, the maximum voltage of the output harmonic is 10% of the rated voltage, and two paths of harmonic can be output at the same time.
The control method of the high-voltage cascading harmonic power supply device comprises the following steps:
directly giving an output target voltage and frequency on an interface, and performing PI control on the output target voltage by a voltage controller through the given voltage and a feedback voltage;
step two, the output of the voltage control loop is given as the input of the current control loop, and the current control loop carries out PI control through the input and feedback current;
step three, the output part of the current loop performs decoupling control, and meanwhile, independent decoupling current closed-loop control realizes current instruction no-static-difference tracking under a synchronous rotation coordinate system, and a target modulation wave is output;
step four, the modulation wave is issued to a power unit through a PWM plate, and a controller of the power unit drives an IGBT power device to output target voltage;
wherein: the park transformation part angle is provided by a phase-locked loop;
the harmonic controller part can output two paths of harmonic waves, and can respectively set a harmonic voltage value and a frequency; after the harmonic controller calculates the target voltage, the voltage is superimposed on the modulated wave to be finally output;
wherein the harmonic control part adopts PR control; the core control algorithm is as follows:
the PR controller transfer function is:
ω c for cut-off frequency omega 0 Is the resonant frequency, K P And K I Are all constant.
Further, when the system output is connected with the transformer for isolation and voltage conversion, a DC voltage component with smaller primary side voltage of the transformer has larger DC current circulation, and the reliability of the power supply system is reduced; control to reduce and eliminate the direct current component part is very necessary; the method for controlling the direct current component in the current is realized by three-phase separate control, each phase passes through a detection current signal, is Ifb after passing through a low-pass filter, and is compared with a given target current Iref, the obtained difference Idelta is subjected to integral control by a PI controller, and the integral output part is subjected to amplitude limiting and is superposed to a three-phase output modulation wave; the direct current component of the output caused by zero drift of the system hardware acquisition operational amplifier circuit and partial dead zone of the inversion unit can be eliminated.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention can output three-phase fundamental wave voltage rated range of 0-10 kv and has 1.35 times voltage overload capacity, and the equipment can be used for carrying out high-pass 1.35 times and 1.25 times and low-pass and zero-pass tests of three-phase voltage and carrying out three-phase symmetrical low-pass 20% rated voltage waveforms of low-pass tests;
2. the invention controls the direct current component of the output part in the system with transformer connection, prevents the saturation and output distortion of the transformer core, and causes equipment damage when serious;
3. the invention has the advantages of convenient control, simple structure, low cost and the like in the fields of voltage control, harmonic voltage control and voltage high-low penetration.
Drawings
FIG. 1 is a system topology diagram;
FIG. 2 is a partial structure of a power cell;
FIG. 3 output harmonic voltage plot
FIG. 4 shows a voltage waveform with an output voltage 20% lower than that of the voltage
FIG. 5 is a control algorithm diagram;
fig. 6 transformer dc bias suppression control;
fig. 7 harmonic analysis of the dc bias suppression output voltage of the transformer.
Detailed Description
The following detailed description of the embodiments of the invention is provided with reference to the accompanying drawings.
The basic topology of a high voltage cascaded harmonic power supply device is shown in fig. 1. The system consists of an input control part, a phase-shifting transformer 380V-690V, a cascade H-bridge power unit part, an output filtering part, a control part, communication and protection parts and the like.
The basic power unit composition of the high voltage cascaded harmonic power supply device is shown in fig. 2. The three-phase rectifier comprises four parts, namely an input three-phase rectifier bridge, a direct-current capacitor, an output H-bridge structure and a control part.
The output part of the high-voltage cascade harmonic power supply device consists of a filter part such as a reactor and a filter capacitor.
The invention can output the harmonic wave with the range of 2-50 times, the maximum voltage of the output harmonic wave is 10% of the rated voltage, and two paths of harmonic waves can be output at the same time. The voltage waveform of the output 50 th harmonic is shown in fig. 3.
The invention can output three-phase fundamental voltage with rated range of 0-10 kv and 1.35 times of voltage overload capacity, and can perform high-pass 1.35 times and 1.25 times and low-pass and zero-pass tests of three-phase voltage by using equipment, and the control algorithm flow is shown in figure 5 at the same time as the three-phase symmetrical low-pass 20% rated voltage waveform diagram 4 of the low-pass test.
The invention controls the direct current component of the output part in the system with the transformer connection, prevents the saturation and output distortion of the transformer core, and causes equipment damage when serious. The control logic portion of which is shown in fig. 6.
Referring to fig. 1, fig. 2, fig. 5, and fig. 6, in this embodiment, the system input may directly take low-voltage AC380v, and output 690v voltage via a phase-shifting transformer to supply power to the power unit, where the power unit is an H-bridge structure output, and each phase is formed by 12 unit cascades. The system has 36 power units. The output part is connected with the filter reactor and then is connected with the RC filter part in parallel.
The control algorithm signals are subjected to the following steps:
1. and directly giving an output target voltage and frequency on an interface, and performing PI control on the output target voltage by a voltage controller through the given voltage and the feedback voltage.
2. The output of the voltage control loop is given as an input to the current control loop, which performs PI control by the input and feedback currents.
3. And the output part of the current loop performs decoupling control, and meanwhile, independent decoupling current closed-loop control realizes no-static-difference tracking of current instructions under a synchronous rotation coordinate system and outputs target modulation waves.
4. The modulation wave is transmitted to the power unit through the PWM plate, and the controller of the power unit drives the IGBT power device to output target voltage.
5. Wherein the park transformation part angle is provided by a phase locked loop.
6. The harmonic controller part can output two paths of harmonic waves, and can respectively set the harmonic voltage value and the frequency. After the harmonic controller calculates the target voltage, the voltage is superimposed on the modulated wave as the final output.
7. Wherein the harmonic control section adopts PR control. The core control algorithm is as follows:
the PR controller transfer function is:
ωc is the cut-off frequency and the corresponding differential expression is
y(k)＝b 0 u(k)+b 1 u(k-1)+b 2 u(k-2)-a 1 y(k-1)-a 2 y(k-2)
Where y (k) is the output result of the PR controller, y (k-1) is the last calculated output result of the PR controller, and u (k) is the input variable of the PR controller. The coefficient values in the expression are:
omega is the resonant frequency; ts is the sampling period of the control system.
8. When the system output is connected with the transformer for isolation and voltage conversion, the DC voltage component with smaller primary side voltage of the transformer has larger DC current circulation, and the reliability of the power supply system is reduced. It is necessary to reduce and eliminate the control of the direct current component part.
The principle diagram of the direct current component control method in the current is shown in fig. 6, the implementation method is that the direct current component control method is controlled by three phases respectively, each phase is connected with a detection current signal, the detection current signal is Ifb after passing through a low-pass filter, the detection current signal is compared with a given target current Iref, the obtained difference Idelta is subjected to integral control by a PI controller, and an integral output part is subjected to limit amplitude superposition to three-phase output modulation waves. The direct current component of the output caused by zero drift of the system hardware acquisition operational amplifier circuit and partial dead zone of the inversion unit can be eliminated. The control effect obtained according to the method is the harmonic analysis of the DC magnetic bias suppression output voltage of the transformer in fig. 7
The steps are all algorithm control and data processing through the DSP.
The above examples are implemented on the premise of the technical scheme of the present invention, and detailed implementation manners and specific operation processes are given, but the protection scope of the present invention is not limited to the above examples. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (2)
1. A control method of a high-voltage cascade harmonic power supply device comprises a 380V-690V phase-shifting transformer, a cascade H-bridge power unit and an output filter unit; the H-bridge power unit comprises an input three-phase rectifier bridge, a direct-current capacitor, an output H-bridge structure and a control system from input to output;
the output filtering unit comprises a reactor and a filtering capacitor filtering part; the output harmonic range is 2-50 times of harmonic, the maximum voltage of the output harmonic is 10% of the rated voltage, and two paths of harmonic are output simultaneously;
the control method is characterized by comprising the following steps of:
directly giving an output target voltage and frequency on an interface, and performing PI control on the output target voltage by a voltage controller through the given voltage and a feedback voltage;
step two, the output of the voltage control loop is given as the input of the current control loop, and the current control loop carries out PI control through the input and feedback current;
step three, the output part of the current loop performs decoupling control, and meanwhile, independent decoupling current closed-loop control realizes current instruction no-static-difference tracking under a synchronous rotation coordinate system, and a target modulation wave is output;
step four, the modulation wave is issued to an H-bridge power unit through a PWM plate, and a controller of the H-bridge power unit drives an IGBT power device to output target voltage;
the harmonic controller part outputs two paths of harmonic waves, and a harmonic voltage value and a frequency are respectively set; after the harmonic controller calculates the target voltage, the voltage is superimposed on the modulated wave to be finally output;
wherein the harmonic control part adopts PR control; the core control algorithm is as follows:
the PR controller transfer function is:
ω c for cut-off frequency omega 0 Is the resonant frequency, K P And K I Are all constant.
2. The control method of a high voltage cascade harmonic power supply device according to claim 1, wherein the control of the dc component is reduced and eliminated when the system output is connected to the phase-shifting transformer for isolation and voltage conversion; the method for controlling the direct current component in the current is realized by three-phase separate control, each phase is controlled by detecting a current signal, the current passing through a low-pass filter is Ifb, the current is compared with a given target current Iref, the obtained difference Idelta is subjected to integral control by a PI controller, and an integral output part is subjected to limit amplitude superposition to three-phase output modulation waves; and eliminating the direct current component of the output caused by the zero drift of the system hardware acquisition operational amplifier circuit and the partial dead zone of the inversion unit.
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Citations (4)
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|---|---|---|---|---|
| JP2000276243A (en) * | 1999-03-23 | 2000-10-06 | Toshiba Corp | Controller for semiconductor switch |
| CN101359833A (en) * | 2008-09-08 | 2009-02-04 | 山东新风光电子科技发展有限公司 | Harmonic reactive compensating apparatus and control method thereof |
| CN106451466A (en) * | 2016-11-01 | 2017-02-22 | 辽宁工程技术大学 | Grid power quality control system and method based on unified power quality conditioner |
| CN107947177A (en) * | 2017-12-01 | 2018-04-20 | 武汉科力源电气有限公司 | Based on H bridge hybrid active filters |
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2019
- 2019-12-26 CN CN201911370454.7A patent/CN111030474B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000276243A (en) * | 1999-03-23 | 2000-10-06 | Toshiba Corp | Controller for semiconductor switch |
| CN101359833A (en) * | 2008-09-08 | 2009-02-04 | 山东新风光电子科技发展有限公司 | Harmonic reactive compensating apparatus and control method thereof |
| CN106451466A (en) * | 2016-11-01 | 2017-02-22 | 辽宁工程技术大学 | Grid power quality control system and method based on unified power quality conditioner |
| CN107947177A (en) * | 2017-12-01 | 2018-04-20 | 武汉科力源电气有限公司 | Based on H bridge hybrid active filters |
Non-Patent Citations (1)
| Title |
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| 牵引供电系统阻抗频率特性测试技术研究;刘秋降;《中国博士学位论文全文数据库 工程科技Ⅱ辑》;20190115(第1期);第33-34,42,44-45页 * |
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