CN111917118A - Active voltage quality adjusting device and method based on power electronics - Google Patents
Active voltage quality adjusting device and method based on power electronics Download PDFInfo
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- CN111917118A CN111917118A CN202010786179.3A CN202010786179A CN111917118A CN 111917118 A CN111917118 A CN 111917118A CN 202010786179 A CN202010786179 A CN 202010786179A CN 111917118 A CN111917118 A CN 111917118A
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- 230000008569 process Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
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- 230000009466 transformation Effects 0.000 abstract description 6
- 230000008878 coupling Effects 0.000 abstract description 4
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- 238000003908 quality control method Methods 0.000 description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- Y02E40/30—Reactive power compensation
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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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Abstract
The invention discloses an active voltage quality adjusting device and an active voltage quality adjusting method based on power electronics, which comprise the following steps: the low-voltage main loop is connected with the power electronic function module; the power electronic function module is connected with the thyristor component; the device is connected between a power grid and a load in series, the voltage of the power grid is detected in real time, the difference value is made between the abnormal voltage and the target reference voltage, so that the voltage which is equal to the difference voltage in magnitude and opposite in direction is output by the device and superposed on the voltage of the power grid, and the device can output stable qualified voltage; the problem that in the prior art, in order to solve the voltage drop on the power transmission line, the traditional transformer area transformation means is adopted, and huge transformation cost is generated; the technical problems that the low voltage cannot be effectively controlled and the like exist by adopting the traditional coupling type voltage regulator.
Description
Technical Field
The invention belongs to the voltage quality control technology, and particularly relates to an active voltage quality adjusting device and an active voltage quality adjusting method based on power electronics.
Background
With the rapid economic growth in recent years, the rapid development of the economic construction of urban-rural and rural junctions, the surge of rural power utilization load, and the more and more prominent contradiction between the power supply capacity of the rural power distribution network and the rapidly-growing power utilization demand, the low-voltage problem frequently occurs, the normal power utilization of users is seriously influenced, and a severe test is brought to power supply companies.
When the power provided by the power grid does not meet the load characteristic requirements of the electric equipment, the normal operation of the equipment is affected and even the equipment is damaged, that is, a power quality problem or event occurs. The power quality problem is slight, which causes certain economic loss, and the serious concern is about the stability of the power grid system, so the research of the power quality control technology and the device thereof has important practical significance.
In remote areas, the development of a power distribution network is relatively lagged, and the net rack structure has the characteristics of large power supply radius and dispersed residents. The problem of "low voltage" is caused in the middle and rear sections of the line, especially in the peak period of power consumption, because the power load is scattered on the distribution line sporadically, which causes a large voltage drop on the line. If the traditional platform area transformation means is adopted, huge transformation cost is generated; the traditional coupling voltage regulator has the possibility that the low voltage cannot be effectively controlled, and a new power grid problem is possibly caused.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the active voltage quality adjusting device and the adjusting method based on power electronics are provided to solve the problem that the traditional platform area reconstruction means is adopted to solve the problem of voltage drop on a power transmission line in the prior art, and huge reconstruction cost is generated; the technical problems that the low voltage cannot be effectively controlled and the like exist by adopting the traditional coupling type voltage regulator.
The technical scheme of the invention is as follows:
an active voltage quality adjustment device based on power electronics, comprising: the low-voltage main loop is connected with the power electronic function module; the power electronic function module is connected with the thyristor component.
The thyristor assembly is characterized by further comprising a bypass control circuit, wherein the bypass control circuit realizes forced commutation of the thyristor assembly at any time so as to realize switching between a main circuit and a bypass.
The power electronic function module comprises an input LCL filtering unit, and the input LCL filtering unit is connected with a linear three-level IGBT; the linear three-level IGBT is connected with the output LCL filtering unit.
The power electronic function module further comprises a soft start alternating current contactor and a soft start resistor, and plays a role in limiting starting current.
The power electronic functional module adopts a parallel connection structure with modular design.
The rated current of the three-level IGBT is 75A, and the three-level IGBT is integrally packaged by adopting EasyPack 2B.
The input LCL filtering unit comprises a grid-connected VSC alternating current side formed by Lg and Cf, Ls of the LCL filtering unit is system impedance, Vk, k = a, b and c is converter output voltage, ek is power grid alternating current voltage, ik is converter output current, if is filtering branch current, and iks is converter output current.
The adjusting method comprises the following steps: the device is connected between a power grid and a load in series, the voltage of the power grid is detected in real time, the difference value is made between the abnormal voltage and the target reference voltage, the voltage which is equal to the difference voltage in magnitude and opposite in direction is output by the device and is superposed on the power grid voltage, and the device can output stable qualified voltage.
The adjusting method simultaneously analyzes and compensates the harmonic wave and reactive power content of the power grid; when the voltage is normal or not in the compensation range, the main loop is switched to a bypass operation mode within 10ms, so that the power is not cut off in the load switching process, and the main loop is kept in a low-power consumption standby mode.
The invention has the beneficial effects that:
the invention uses power electronic devices to convert and control electric energy, develops an electric energy quality comprehensive treatment device based on a power electronic technology, has the advantages of stabilizing voltage, solving the problems of voltage sag, overvoltage, undervoltage, three-phase imbalance and the like of a power grid, and also has the functions of filtering power grid voltage harmonic waves and flicker, inhibiting power grid oscillation, compensating reactive power and the like. The equipment can continuously run on line, and the utilization rate is high.
In order to solve the problems of installation and maintenance of equipment, the design idea of a lightweight module unit is adopted, and flexible expansion is realized through parallel connection of modules; the electronic and mechanical bypass parts of the device adopt a mode of thyristor connection, and the forced commutation of the thyristor at any time is realized through control, so that the fast switching between the main circuit and the bypass is realized, and the permanent outage of the rear stage is ensured.
The problem that in the prior art, in order to solve the voltage drop on the power transmission line, the traditional transformer area transformation means is adopted, and huge transformation cost is generated; the technical problems that the low voltage cannot be effectively controlled and the like exist by adopting the traditional coupling type voltage regulator.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Fig. 2 is a schematic structural diagram of an LCL filter unit according to the present invention.
Detailed Description
An active voltage quality adjustment device based on power electronics, comprising: the low-voltage main loop is connected with the power electronic function module; the power electronic function module is connected with the thyristor component.
The thyristor assembly is characterized by further comprising a bypass control circuit, wherein the bypass control circuit realizes forced commutation of the thyristor assembly at any time so as to realize switching between a main circuit and a bypass. The low-voltage main loop and the bypass control circuit are composed of a thyristor and an alternating current contactor to realize rapid switching.
The power electronic function module comprises an input LCL filtering unit, and the input LCL filtering unit is connected with a linear three-level IGBT; the linear three-level IGBT is connected with the output LCL filtering unit.
And determining the voltage of the IGBT, wherein the rated voltage of a system is 220V, the fluctuation is 20% up and down, the direct current voltage after natural rectification is about 300V, and the IGBT with the rated voltage of 650VDC is selected.
The maximum output current of the module is 35A, because the system outputs harmonic current, the crest factor of the current is large, a large margin is reserved when the IGBT is selected, and the IGBT with the rated current of 70A is selected according to experience.
The discrete form IkW75N65ES5 of the English flying company is selected as the switching device of the system by integrating the factors of switching frequency, loss, heat dissipation and the like.
The power electronic function module further comprises a soft start alternating current contactor and a soft start resistor, and plays a role in limiting starting current.
The power electronic functional module adopts a parallel connection structure with modular design.
The rated current of the three-level IGBT is 75A, and the three-level IGBT is integrally packaged by adopting EasyPack 2B.
The rated current of the IGBT module is 75A, so that the safety margin is 3 times by adopting the parallel connection mode of the two IGBT modules, and the service life of the IGBT can be effectively prolonged.
Half bridge arm voltage formed by the IGBT is 1300V, and enough safety margin is reserved. Through a special direct current bus overvoltage detection circuit and program control, the working voltage of the IGBT module can be guaranteed to be not more than 850V under various working conditions.
The input LCL filtering unit comprises a grid-connected VSC alternating current side formed by Lg and Cf, Ls of the LCL filtering unit is system impedance, Vk, k = a, b and c is converter output voltage, ek is power grid alternating current voltage, ik is converter output current, if is filtering branch current, and iks is converter output current.
The adjusting method comprises the following steps: the device is connected between a power grid and a load in series, the voltage of the power grid is detected in real time, the difference value is made between the abnormal voltage and the target reference voltage, the voltage which is equal to the difference voltage in magnitude and opposite in direction is output by the device and is superposed on the power grid voltage, and the device can output stable qualified voltage.
The adjusting method simultaneously analyzes and compensates the harmonic wave and reactive power content of the power grid; when the voltage is normal or not in the compensation range, the main loop is switched to a bypass operation mode within 10ms, so that the power is not cut off in the load switching process, and the main loop is kept in a low-power consumption standby mode.
Claims (9)
1. An active voltage quality adjustment device based on power electronics, comprising: the low pressure major loop, its characterized in that: the low-voltage main loop is connected with the power electronic function module; the power electronic function module is connected with the thyristor component.
2. A power electronics based active voltage quality adjustment device according to claim 1, characterized in that: the thyristor assembly is characterized by further comprising a bypass control circuit, wherein the bypass control circuit realizes forced commutation of the thyristor assembly at any time so as to realize switching between a main circuit and a bypass.
3. A power electronics based active voltage quality adjustment device according to claim 1, characterized in that: the power electronic function module comprises an input LCL filtering unit, and the input LCL filtering unit is connected with a linear three-level IGBT; the linear three-level IGBT is connected with the output LCL filtering unit.
4. A power electronics based active voltage quality adjustment apparatus according to claim 3, characterized in that: the power electronic function module further comprises a soft start alternating current contactor and a soft start resistor, and plays a role in limiting starting current.
5. A power electronics based active voltage quality adjustment device according to claim 1, characterized in that: the power electronic functional module adopts a parallel connection structure with modular design.
6. A power electronics based active voltage quality adjustment apparatus according to claim 3, characterized in that: the rated current of the three-level IGBT is 75A, and the three-level IGBT is integrally packaged by adopting EasyPack 2B.
7. An electricity-based power device according to claim 3Active voltage quality adjusting device of son, its characterized in that: the input LCL filtering unit consists of Lg、CfL forming grid-connected VSC alternating current side and LCL filtering unitsIs the system impedance, VkK = a, b, c, converter output voltage, ekFor mains AC voltage, ikFor the converter output current, ifFor filtering the branch current iksAnd outputting current for the converter.
8. A method of regulating a power electronics based active voltage quality regulator according to claim 1, characterized in that: the adjusting method comprises the following steps: the device is connected between a power grid and a load in series, the voltage of the power grid is detected in real time, the difference value is made between the abnormal voltage and the target reference voltage, the voltage which is equal to the difference voltage in magnitude and opposite in direction is output by the device and is superposed on the power grid voltage, and the device can output stable qualified voltage.
9. The method for adjusting the active voltage quality adjusting device based on the power electronics as claimed in claim 1, wherein: the adjusting method simultaneously analyzes and compensates the harmonic wave and reactive power content of the power grid; when the voltage is normal or not in the compensation range, the main loop is switched to a bypass operation mode within 10ms, so that the power is not cut off in the load switching process, and the main loop is kept in a low-power consumption standby mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010786179.3A CN111917118A (en) | 2020-08-07 | 2020-08-07 | Active voltage quality adjusting device and method based on power electronics |
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| CN202010786179.3A CN111917118A (en) | 2020-08-07 | 2020-08-07 | Active voltage quality adjusting device and method based on power electronics |
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Citations (6)
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|---|---|---|---|---|
| CN1828468A (en) * | 2006-03-14 | 2006-09-06 | 西安交通大学 | Transformer-free tandem active alternating voltage quality adjuster and its control method |
| CN101403780A (en) * | 2008-11-13 | 2009-04-08 | 中国电力科学研究院 | Laboratory test device and method for dynamic electric voltage recovery device |
| CN203481839U (en) * | 2013-09-17 | 2014-03-12 | 无锡力豪科技有限公司 | Super capacitor dynamic voltage recovery system and power supply system |
| CN106972505A (en) * | 2017-05-05 | 2017-07-21 | 贵州电网有限责任公司电力科学研究院 | The hybrid power electronic transformer and its control method of unified power quality controlling |
| CN108365605A (en) * | 2018-03-08 | 2018-08-03 | 西安爱科赛博电气股份有限公司 | A kind of low-voltage network three-phase line low-voltage governing system and method |
| CN208209530U (en) * | 2018-04-03 | 2018-12-07 | 西南交通大学 | Quick voltage restorer based on direct voltage control method |
-
2020
- 2020-08-07 CN CN202010786179.3A patent/CN111917118A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1828468A (en) * | 2006-03-14 | 2006-09-06 | 西安交通大学 | Transformer-free tandem active alternating voltage quality adjuster and its control method |
| CN101403780A (en) * | 2008-11-13 | 2009-04-08 | 中国电力科学研究院 | Laboratory test device and method for dynamic electric voltage recovery device |
| CN203481839U (en) * | 2013-09-17 | 2014-03-12 | 无锡力豪科技有限公司 | Super capacitor dynamic voltage recovery system and power supply system |
| CN106972505A (en) * | 2017-05-05 | 2017-07-21 | 贵州电网有限责任公司电力科学研究院 | The hybrid power electronic transformer and its control method of unified power quality controlling |
| CN108365605A (en) * | 2018-03-08 | 2018-08-03 | 西安爱科赛博电气股份有限公司 | A kind of low-voltage network three-phase line low-voltage governing system and method |
| CN208209530U (en) * | 2018-04-03 | 2018-12-07 | 西南交通大学 | Quick voltage restorer based on direct voltage control method |
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