CN101908767A - Device for comprehensively compensating reactive power harmonics - Google Patents
Device for comprehensively compensating reactive power harmonics Download PDFInfo
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- 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
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Abstract
The invention relates to a device for comprehensively compensating reactive power harmonics, relating to the filed of electric power automation equipment, and solving the problem of low precision and reliability and high cost of the existing power quality controller. A detecting unit is used for detecting power grid voltage and load current, and converting the power grid voltage and the load current into simulated measuring electrical signals and transferring the signals to a controlling unit; the controlling unit is used for calculating the simulated measuring electrical signals to obtain the reactive power harmonic current in the load current and sending a compensating current controlling signal to a compensating unit; the compensating unit is used for sending the current opposite to the reactive power harmonic current in the load current so as to offset the reactive power harmonic current in the load current to enable the system current to only contain a sine active current component; and the compensating unit comprises a condenser passive compensator controlled by a thyristor and an active compensator controlled by IGBT. The invention realizes the dynamic comprehensive compensation of the reactive power harmonics through the current with equal intensity and opposite direction generated by the compensating unit and through the detecting of the load current.
Description
Technical field
The present invention relates to the Electric Power Automation Equipment field, be specifically related to a kind of quality of power supply control device.
Background technology
Various power rectifier, converter etc. are a large amount of non-linear and have an extensive use of time-varying characteristics load, cause reactive power and harmonic wave in the electric power system significantly to increase, have a strong impact on grid voltage quality, cause the increasing of via net loss, energy waste is serious, and the production of electric energy, transmission and utilization ratio reduce, also make device of overheating of electrical, easy and system produces resonance, threatens the normal operation of electric equipment, brings great harm to power consumer.
For dynamic compensation reactive power and harmonic wave, conventional method is exactly to adopt the LC tuned filter (TSF) of thuristor throw-in and throw-off control.But this method is compensation harmonic both, but compensating power again, and also simple in structure, be widely used always.Influenced by electric network impedance and running status but the major defect of this method is a compensation characteristic, easily and system's generation parallel resonance, cause harmonic wave to amplify, the LC filter is transshipped even burn.In addition, it can only compensate the harmonic wave of fixed frequency, and compensation effect is also not satisfactory, causes reactive power to cross simultaneously easily and mends or owe to mend.
Active Power Filter-APF (APF) is to carry out idle and effective ways harmonic compensation, it can produce with load current in the anti-electric current of idle harmonious phase of wave, overcome the shortcoming of TSF, compensation and good wave filtering effect, but because all idle and harmonic wave capacity are all born by the APF based on the IGBT inverter, problems such as its cost height, heat radiation is difficult, noise is big, poor reliability are very outstanding, limited large-area application.
Therefore, press for the idle and harmonic wave comprehensive compensation solution of seeking a low cost, high accuracy, high reliability.
Summary of the invention
The present invention has the problem that the existing precision of electric energy quality controller is low, reliability is low and cost is high now in order to solve, and has proposed a kind of device for comprehensively compensating reactive power harmonics.
The present invention includes detecting unit, control unit and compensating unit;
Detecting unit, the electrical signal of described detecting unit is connected with the analogue measurement electric signal input end of control unit, be used for detection of grid voltage and load current, and described line voltage and load current difference converting analogue are measured electrical signal transfer to control unit;
Control unit is used for the analogue measurement signal of telecommunication that receives is calculated the reactive power harmonic current of load current, and sends the offset current control signal to compensating unit;
Compensating unit, the signal input end of described compensating unit is connected with the control signal output ends of control unit, the offset current control signal that is used for sending according to control unit sends and the opposite electric current of the idle harmonic wave of load current, to offset the reactive power harmonic current in the load current, make and only contain sinusoidal active current component in the system power.
Described compensating unit comprises the capacitor type passive compensator of thyristor control and the active compensation device of IGBT control, the capacitor type passive compensator of described thyristor control is in order to satisfy the requirement of big capacity compensation and compensation precision, many group capacitive branch are set as required, switching control by capacitive branch, carry out the grouping switching of capacitive reactive power, realize reactive power compensation; The active compensation device of described IGBT control by the quick break-make control to each IGBT, sends needed idle and harmonic current based on voltage source inverter, and wherein said switching control and break-make control are controlled by control unit.
Device for comprehensively compensating reactive power harmonics of the present invention (TAPF) is by the detection of load current, produced and load current equal and opposite in direction, electric current that direction is opposite by the compensating unit based on thyristor and IGBT, realizes idle and dynamic comprehensive compensating harmonic wave.
Device for comprehensively compensating reactive power harmonics of the present invention (TAPF) advantage is:
(1) can carry out dynamic compensation simultaneously to idle and harmonic wave.
(2) passive compensator carries out reactive power compensation, and the active compensation device carries out harmonic current to be suppressed, and can display one's respective advantages, and learns from other's strong points to offset one's weaknesses.
(3) also can to provide passive compensator can not compensate the residue that puts in place idle for the active compensation device, realizes that power factor whole process is close to 1.
(4) combination of the two has solved the contradiction of big capacity, cost, compensation precision and reliability, for distribution network electric energy quality control provides brand-new thinking.
Description of drawings
Fig. 1 is the structural representation of device for comprehensively compensating reactive power harmonics; Fig. 2 is the structural representation of the control unit 2 of device for comprehensively compensating reactive power harmonics; Fig. 3 to Figure 15 is the structural representation of the capacitor type passive compensator of the thyristor control in the compensating unit 3, Fig. 3 is a three-phase three-wire system, star connects mode, the structural representation of two thyristor inverse parallel structure passive compensators, Fig. 4 is a three-phase three-wire system, star connects mode, the structural representation of thyristor and diode inverse parallel structure passive compensator, Fig. 5 is a three-phase three-wire system, the corner connection mode, the structural representation of two thyristor inverse parallel structure passive compensators, be 6 to be three-phase three-wire systems, the corner connection mode, the structural representation of thyristor and diode inverse parallel structure passive compensator, Fig. 7 is a three-phase three-wire system, capacitor corner connection mode, two thyristor inverse parallels are at the structural representation of angle external structure passive compensator, Fig. 8 is a three-phase three-wire system, capacitor corner connection mode, thyristor and diode inverse parallel are at the structural representation of angle external structure passive compensator, Fig. 9 is a three-phase three-wire system, the capacitor star connects mode, the structural representation of two-phase controlled architecture passive compensator, Figure 10 is a three-phase three-wire system, capacitor corner connection mode, the structural representation of two-phase controlled architecture passive compensator, Figure 11 and Figure 12 are three-phase three-wire systems, the thyristor corner connection, capacitor is at the structural representation of angle external structure passive compensator, Figure 13 is a three-phase four-wire system, star connects mode, the structural representation of two thyristor inverse parallel structure passive compensators, Figure 14 is a three-phase four-wire system, star connects mode, the structural representation of thyristor and diode inverse parallel structure passive compensator, Figure 15 is the structural representation of embodiment seven; Figure 16 to Figure 20 is the structural representation of the active compensation device of the IGBT control in the compensating unit 3, Figure 16 is the structural representation of three-phase three-wire system, three phase full bridge structure active compensation device, Figure 17 is the structural representation of three-phase four-wire system, split capacitor structure active compensation device, Figure 18 is the structural representation of three-phase four-wire system, four brachium pontis structure active compensation devices, Figure 19 is the structural representation of three level structure active compensation devices, and Figure 20 is the structural representation of chain structure active compensation device; Figure 21 to Figure 22 is the wiring schematic diagram of compensating unit 3; Figure 23 is the operation principle schematic diagram of device for comprehensively compensating reactive power harmonics; Figure 24 to Figure 31 is the oscillogram that compensates, Figure 24 is the A phase system voltage oscillogram that only adopts passive compensator to compensate, Figure 25 is the A phase load current waveform figure that only adopts passive compensator to compensate, Figure 26 only adopts A phase system current waveform figure after the compensation that passive compensator compensates, Figure 27 is the A phase offset current oscillogram that only adopts passive compensator to compensate, Figure 28 is the A phase system voltage oscillogram that adopts the present invention to compensate, Figure 29 is the A phase load current waveform figure that adopts the present invention to compensate, Figure 30 adopts A phase system current waveform figure after the compensation that the present invention compensates, and Figure 31 is the A phase offset current oscillogram that adopts the present invention to compensate.
Embodiment
Embodiment one: in conjunction with Fig. 1 present embodiment is described, present embodiment comprises detecting unit 1, control unit 2 and compensating unit 3;
Detecting unit 1, the electrical signal of described detecting unit 1 is connected with the analogue measurement electric signal input end of control unit 2, be used for detection of grid voltage and load current, and described line voltage and load current difference converting analogue are measured electrical signal transfer to control unit 2;
Compensating unit 3, the signal input end of described compensating unit 3 is connected with the control signal output ends of control unit 2, the offset current control signal that is used for sending according to control unit 2 sends and the opposite electric current of the idle harmonic wave of load current, to offset the reactive power harmonic current in the load current, make and only contain sinusoidal active current component in the system power.
Embodiment two: present embodiment is described in conjunction with Fig. 3 to Figure 22, present embodiment and embodiment one difference are that described compensating unit 3 comprises the capacitor type passive compensator of thyristor control and the active compensation device of IGBT control, the capacitor type passive compensator of described thyristor control is in order to satisfy the requirement of big capacity compensation and compensation precision, many group capacitive branch are set as required, switching control by capacitive branch, carry out the grouping switching of capacitive reactive power, realize reactive power compensation; The active compensation device of described IGBT control is based on voltage source inverter, its output inserts electrical network through alternating current filter, by quick break-make control to each IGBT, send needed idle and harmonic current, wherein said switching control and break-make control are controlled by control unit.Other composition is identical with embodiment one with connected mode.
Embodiment three: in conjunction with Fig. 3 to Figure 14 present embodiment is described, present embodiment and embodiment two differences are that the capacitor type passive compensator of thyristor control is any one in following 11 kinds of structure passive compensators:
Three-phase three-wire system, star connect mode, two thyristor inverse parallel structure passive compensators,
Three-phase three-wire system, star connect mode, thyristor and diode inverse parallel structure passive compensator,
Three-phase three-wire system, corner connection mode, two thyristor inverse parallel structure passive compensators,
Three-phase three-wire system, corner connection mode, thyristor and diode inverse parallel structure passive compensator,
Three-phase three-wire system, capacitor corner connection mode, two thyristor inverse parallels are at angle external structure passive compensator,
Three-phase three-wire system, capacitor corner connection mode, thyristor and diode inverse parallel be at angle external structure passive compensator,
Three-phase three-wire system, capacitor star connect mode, two-phase controlled architecture passive compensator,
Three-phase three-wire system, capacitor corner connection mode, two-phase controlled architecture passive compensator,
Three-phase three-wire system, thyristor corner connection, capacitor be at angle external structure passive compensator,
Three-phase four-wire system, star connect mode, two thyristor inverse parallel structure passive compensators,
Three-phase four-wire system, star connect mode, thyristor and diode inverse parallel structure passive compensator;
Other composition is identical with embodiment two with connected mode.
Embodiment four: present embodiment is described in conjunction with Figure 15, present embodiment and embodiment three differences are that the thyristor switch in the capacitor type passive compensator of thyristor control constitutes the thyristor valve group by a plurality of thyristor units in series, is used for the mesohigh system.Other composition is identical with embodiment three with connected mode.
Embodiment five: in conjunction with Figure 16 to Figure 18 present embodiment is described, present embodiment and embodiment two differences are that the active compensation device of IGBT control is any one in following three kinds of structure active compensation devices:
Three-phase three-wire system, three phase full bridge structure active compensation device,
Three-phase four-wire system, split capacitor structure active compensation device,
Three-phase four-wire system, four brachium pontis structure active compensation devices;
Other composition is identical with embodiment two with connected mode.
Embodiment six: present embodiment is described in conjunction with Figure 19 and Figure 20, present embodiment and embodiment five differences are that in three kinds of structure active compensation devices any one is three level structure active compensation devices or chain structure active compensation device, is used for the mesohigh system.Other composition is identical with embodiment five with connected mode.
Embodiment seven: present embodiment is described in conjunction with Fig. 1; present embodiment and embodiment one, two, three, four, five or six differences are also to comprise protected location 4; the guard signal input/output terminal of described protected location 4 is connected with the guard signal input/output terminal of control unit 2, is used for over-voltage over-current protection.Other composition is identical with embodiment one, two, three, four, five or six with connected mode.
Embodiment eight: present embodiment is described in conjunction with Fig. 1, present embodiment and embodiment seven differences are also to comprise man-machine interaction unit 5, the input/output terminal of described man-machine interaction unit 5 is connected with the input/output terminal of control unit 2, is used to be provided with control command and shows running status.Other composition is identical with embodiment seven with connected mode.
Embodiment nine: in conjunction with Fig. 2 present embodiment is described, present embodiment and embodiment eight differences are that control unit 2 comprises analog signal conditioner circuit 21, digital port buffer circuit 22, communication interface circuit 23, pulse width modulation circuit 24 and digital signal processing circuit 25; Digital signal processing circuit 25 by three high-speed peripheral buses respectively with analog signal conditioner circuit 21; digital port buffer circuit 22 is connected with pulse width modulation circuit 24; digital signal processing circuit 25 by one at a slow speed peripheral bus be connected with communication interface circuit 23; the input of analog signal conditioner circuit 21 is the analogue measurement electric signal input end of control unit 2; the input/output terminal of digital port buffer circuit 22 is the guard signal input/output terminal of control unit 2; the input/output terminal of communication interface circuit 23 is the input/output terminal of control unit 2, and the output of pulse width modulation circuit 24 is the control signal output ends of control unit 2.For real-time processing and the response fast that guarantees data, control unit 2 adopts based on digital signal processing circuit, cooperate forward direction analog signal conditioner circuit, digital port buffer circuit and communication interface circuit, digital signal processing circuit can make up a complete high-performance numerical control system hardware platform, and this makes the hardware circuit design of control system obtain good balance at aspects such as terseness, reliability and cost performances.Other composition is identical with embodiment eight with connected mode.
Content of the present invention is not limited only to the content of the respective embodiments described above, and the combination of one of them or several embodiments equally also can realize the purpose of inventing.
Figure 21 and Figure 22 are the wiring schematic diagram of device for comprehensively compensating reactive power harmonics (TAPF), Figure 21 and Figure 22 have provided the winding diagram of phase three-wire three and three-phase and four-line respectively, the combination in any that described compensation arrangement can be Fig. 3 to passive compensator shown in Figure 15 and Figure 16 to active compensation device structure shown in Figure 20.
Figure 24 to Figure 31 is the oscillogram that compensates, the oscillogram of Figure 24 to Figure 27 for only adopting passive compensator to compensate, and as seen from the figure, it is most of idle that passive compensator has absorbed, and also absorbed the part low-order harmonic simultaneously; In conjunction with Figure 23, obtain the oscillogram of Figure 28 to Figure 31 for adopting device for comprehensively compensating reactive power harmonics of the present invention (TAPF) to compensate, as seen from the figure, idle and harmonic wave has all carried out good compensation.
Claims (9)
1. device for comprehensively compensating reactive power harmonics is characterized in that it comprises detecting unit (1), control unit (2) and compensating unit (3);
Detecting unit (1), the electrical signal of described detecting unit (1) is connected with the analogue measurement electric signal input end of control unit (2), be used for detection of grid voltage and load current, and described line voltage and load current difference converting analogue are measured electrical signal transfer to control unit (2);
Control unit (2) is used for the analogue measurement signal of telecommunication that receives is calculated the reactive power harmonic current of load current, and sends the offset current control signal to compensating unit (3);
Compensating unit (3), the signal input end of described compensating unit (3) is connected with the control signal output ends of control unit (2), be used for sending and the opposite electric current of the idle harmonic wave of load current according to the offset current control signal that control unit (2) sends, to offset the reactive power harmonic current in the load current, make and only contain sinusoidal active current component in the system power.
2. device for comprehensively compensating reactive power harmonics according to claim 1 is characterized in that described compensating unit (3) comprises the capacitor type passive compensator of thyristor control and the active compensation device of IGBT control.
3. device for comprehensively compensating reactive power harmonics according to claim 2, the capacitor type passive compensator that it is characterized in that thyristor control are any one in following 11 kinds of structure passive compensators:
Three-phase three-wire system, star connect mode, two thyristor inverse parallel structure passive compensators,
Three-phase three-wire system, star connect mode, thyristor and diode inverse parallel structure passive compensator,
Three-phase three-wire system, corner connection mode, two thyristor inverse parallel structure passive compensators,
Three-phase three-wire system, corner connection mode, thyristor and diode inverse parallel structure passive compensator,
Three-phase three-wire system, capacitor corner connection mode, the structure passive compensator of two thyristor inverse parallels outside the angle,
Three-phase three-wire system, capacitor corner connection mode, thyristor and the structure passive compensator of diode inverse parallel outside the angle,
Three-phase three-wire system, capacitor star connect mode, the controlled structure passive compensator of two-phase,
Three-phase three-wire system, capacitor corner connection mode, the controlled structure passive compensator of two-phase,
Three-phase three-wire system, thyristor corner connection, the capacitor structure passive compensator outside the angle,
Three-phase four-wire system, star connect mode, two thyristor inverse parallel structure passive compensators,
Three-phase four-wire system, star connect mode, thyristor and diode inverse parallel structure passive compensator.
4. device for comprehensively compensating reactive power harmonics according to claim 3 is characterized in that the thyristor switch in the capacitor type passive compensator of thyristor control constitutes the thyristor valve group by a plurality of thyristor units in series.
5. device for comprehensively compensating reactive power harmonics according to claim 2, the active compensation device that it is characterized in that IGBT control are any one in following three kinds of structure active compensation devices:
Three-phase three-wire system, three phase full bridge structure active compensation device,
Three-phase four-wire system, split capacitor structure active compensation device,
Three-phase four-wire system, four brachium pontis structure active compensation devices.
6. device for comprehensively compensating reactive power harmonics according to claim 5 is characterized in that in described three kinds of structure active compensation devices any one is three level structure active compensation devices or chain structure active compensation device.
7. according to claim 1,2,3,4,5 or 6 described device for comprehensively compensating reactive power harmonics; it is characterized in that it also comprises protected location (4); the guard signal input/output terminal of described protected location (4) is connected with the guard signal input/output terminal of control unit (2), is used for over-voltage over-current protection.
8. device for comprehensively compensating reactive power harmonics according to claim 7, it is characterized in that it also comprises man-machine interaction unit (5), the input/output terminal of described man-machine interaction unit (5) is connected with the input/output terminal of control unit (2), is used to be provided with control command and shows running status.
9. device for comprehensively compensating reactive power harmonics according to claim 8 is characterized in that control unit (2) comprises analog signal conditioner circuit (21), digital port buffer circuit (22), communication interface circuit (23), pulse width modulation circuit (24) and digital signal processing circuit (25); Digital signal processing circuit (25) by three high-speed peripheral buses respectively with analog signal conditioner circuit (21); digital port buffer circuit (22) is connected with pulse width modulation circuit (24); digital signal processing circuit (25) by one at a slow speed peripheral bus be connected with communication interface circuit (23); the input of analog signal conditioner circuit (21) is the analogue measurement electric signal input end of control unit (2); the input/output terminal of digital port buffer circuit (22) is the guard signal input/output terminal of control unit (2); the input/output terminal of communication interface circuit (23) is the input/output terminal of control unit (2), and the output of pulse width modulation circuit (24) is the control signal output ends of control unit (2).
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| CN2010102412050A CN101908767A (en) | 2010-07-31 | 2010-07-31 | Device for comprehensively compensating reactive power harmonics |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103631151A (en) * | 2013-11-11 | 2014-03-12 | 广州供电局有限公司 | Voltage sag physical simulation system and control method thereof |
| CN106374476A (en) * | 2015-07-23 | 2017-02-01 | 利思电气（上海）有限公司 | Composite chain-type high-voltage active filtering device |
| CN106786471A (en) * | 2015-11-20 | 2017-05-31 | 中国石油化工股份有限公司 | A kind of unidirectional active power compensator of power network neutral point isolated neutral system |
| CN108879739A (en) * | 2018-08-07 | 2018-11-23 | 重庆大全泰来电气有限公司 | A kind of three-phase imbalance regulating device |
| CN109520534A (en) * | 2018-10-22 | 2019-03-26 | 范启明 | A kind of Medical Devices signal transmission detection compensation device |
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| CN1428910A (en) * | 2002-10-11 | 2003-07-09 | 清华大学 | Thyratron throw-over capacitor group compensating equipment |
| CN1599187A (en) * | 2004-09-10 | 2005-03-23 | 清华大学 | Electric energy mass and powerless compensation combination controller |
| CN101068082A (en) * | 2007-03-28 | 2007-11-07 | 中国南车集团株洲电力机车研究所 | Comprehensive compensating device and method |
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| CN1428910A (en) * | 2002-10-11 | 2003-07-09 | 清华大学 | Thyratron throw-over capacitor group compensating equipment |
| CN1599187A (en) * | 2004-09-10 | 2005-03-23 | 清华大学 | Electric energy mass and powerless compensation combination controller |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103631151A (en) * | 2013-11-11 | 2014-03-12 | 广州供电局有限公司 | Voltage sag physical simulation system and control method thereof |
| CN103631151B (en) * | 2013-11-11 | 2017-10-03 | 广州供电局有限公司 | voltage sag physical simulation system and its control method |
| CN106374476A (en) * | 2015-07-23 | 2017-02-01 | 利思电气（上海）有限公司 | Composite chain-type high-voltage active filtering device |
| CN106786471A (en) * | 2015-11-20 | 2017-05-31 | 中国石油化工股份有限公司 | A kind of unidirectional active power compensator of power network neutral point isolated neutral system |
| CN108879739A (en) * | 2018-08-07 | 2018-11-23 | 重庆大全泰来电气有限公司 | A kind of three-phase imbalance regulating device |
| CN109520534A (en) * | 2018-10-22 | 2019-03-26 | 范启明 | A kind of Medical Devices signal transmission detection compensation device |
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Application publication date: 20101208 |