CN103746386A - Reactive compensation device and compensation method - Google Patents
Reactive compensation device and compensation method Download PDFInfo
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- CN103746386A CN103746386A CN201410007940.3A CN201410007940A CN103746386A CN 103746386 A CN103746386 A CN 103746386A CN 201410007940 A CN201410007940 A CN 201410007940A CN 103746386 A CN103746386 A CN 103746386A
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- thyristor
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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
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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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Abstract
The invention discloses a reactive compensation device, comprising a power grid and a controller; the controller is connected with a zero wire and a live wire of the power grid by a voltage sensor; the controller is connected with the live wire of the power grid by a current sensor; 2-20 compensation units are connected between the zero wire and the live wire in parallel; each compensation unit comprises a turning-off thyristor and a capacitor which are connected in series; one end of the capacitor is connected with the zero wire; the other end of the capacitor is connected with the live wire by the turning-off thyristor; two control poles of the turning-off thyristor are connected with the controller respectively. The number of the switched capacitor is automatically adjusted by the controller, thus compensating the reactive power, reducing the design capacity of the power generating and supplying equipment, reducing investment and reducing wire loss.
Description
Technical field
The controlling electric energy field that the present invention relates to electric power system, relates in particular to a kind of reactive power compensator and compensation method.
Background technology
Continuous construction along with intelligent grid, have diversified distributed power source and various types of load adds electrical network, this certainly will cause the large-scale variation of the reactive power of network system, and existing inactivity compensation device is general, all according to electrical network situation at that time, arrange, wide variation in the face of power system reactive power, current reactive power compensator is all fixed, can not dynamically adjust according to the idle state of electrical network, thereby can not adapt to new forms of energy and the continuous actual conditions that dynamically drop into or switch of multiple load that intelligent grid faces.
Summary of the invention
The object of this invention is to provide a kind of reactive power compensator and compensation method, the idle parameter of real-time detection of grid, according to testing result, automatically adjust the quantity of the capacitor dropping into, compensating power, the design capacity of minimizing generation and supply electric equipment, reduce investment, reduce line loss.
A technical scheme of the present invention is reactive power compensator, comprises electrical network and controller, and described controller connects zero line and the live wire of described electrical network by voltage sensor, and described controller connects the live wire of described electrical network by current sensor; Between described zero line and live wire, be parallel with 2 ~ 20 compensating units, each compensating unit comprises turn-off thyristor and the electric capacity being cascaded, and one end of described electric capacity connects zero line, and the other end of described electric capacity connects live wire by described turn-off thyristor; Control the utmost point and connect respectively described controller for two of described turn-off thyristor.Described controller is controlled respectively magnitude of voltage and the current value in voltage sensor and the real-time detection of grid of current sensor, and receive testing result, then according to check result, calculate, the most backward turn-off thyristor transmitted signal, controls conducting and the cut-off of turn-off thyristor, and then automatically adjusts the quantity of the capacitor dropping into, compensating power, reduce the design capacity of generation and supply electric equipment, reduce investment, reduce line loss.
Further, controller connects respectively AC power and ground.
Another technical scheme of the present invention is the reactive-load compensation method of reactive power compensator, comprises the following steps:
Magnitude of voltage on a, voltage sensor senses electrical network, and this magnitude of voltage is sent to controller; Current value in current sensor detection of grid, and this magnitude of voltage is sent to controller; Setting power factor value;
B, described controller, by the magnitude of voltage and the current value that receive, are calculated the phase angle between current phasor and voltage vector, then calculate the power factor value at this phase angle;
The power factor value that c, basis are calculated, described controller, to turn-off thyristor transmitted signal, is controlled the closed and disconnected of turn-off thyristor; And
D, described controller continue to control respectively voltage sensor and current sensor continues magnitude of voltage and the current value in detection of grid, and receives testing result, again judges, enters next duty cycle.
Further, described step c comprises the steps:
C1, when the power factor value of calculating is between target setting lower limit and 1, described controller is controlled respectively voltage sensor and current sensor and is continued magnitude of voltage and the current value in detection of grid, and receives testing result, again judges; When the power factor value of calculating is not between target setting lower limit and 1, whether the power factor value that further judgement is calculated is greater than 0;
If the power factor value that c2 calculates is greater than 0, a closed turn-off thyristor, with the electric capacity conducting of this turn-off thyristor capacitances in series, then described controller is controlled respectively voltage sensor and current sensor and is continued to detect and receive testing result, again judges; If the power factor value of calculating is less than 0, turn-off a turn-off thyristor, with the electric capacity cut-off of this turn-off thyristor capacitances in series, then described controller is controlled respectively voltage sensor and current sensor continues to detect and receive testing result, again judges.
Further, when described controller sends high level to turn-off thyristor, turn-off thyristor conducting; When described controller sends low level to turn-off thyristor, turn-off thyristor cut-off.
Further, the expression formula of described power factor is as follows:
K=cos(Φ
1-Φ
2), 0 °=< Φ wherein
1<=90 °, 0 °=< Φ
2<=90 °, K represents power factor, Φ
1the phase angle that represents voltage, Φ
2the phase angle that represents electric current.
Beneficial effect: controller is controlled respectively magnitude of voltage and the current value in voltage sensor and the real-time detection of grid of current sensor, and receive testing result, then according to check result, calculate, the most backward turn-off thyristor transmitted signal, controls conducting and the cut-off of turn-off thyristor, and then automatically adjusts the quantity of the capacitor dropping into, compensating power, reduce the design capacity of generation and supply electric equipment, reduce investment, reduce line loss.
Accompanying drawing explanation
Fig. 1 is the structural representation of an embodiment of the present invention;
Fig. 2 is the control of reactive power compensating flow chart of the another kind of embodiment of the present invention.
Mark in figure: 1-electrical network; 2-controller; 3-voltage sensor; 4-current sensor; 5-compensating unit; 6-turn-off thyristor; 7-electric capacity.
Embodiment
Below in conjunction with accompanying drawing, preferably embodiment of the present invention is described in further detail:
Referring to Fig. 1, reactive power compensator, comprises electrical network 1 and controller 2, and described controller 2 connects zero line and the live wire of described electrical network 1 by voltage sensor 3, and described controller 2 connects the live wire of described electrical network 1 by current sensor 4; Between described zero line and live wire, be parallel with 2 compensating units 5, each compensating unit 5 comprises turn-off thyristor 6 and the electric capacity 7 being cascaded, and one end of described electric capacity 7 connects zero line, and the other end of described electric capacity 7 connects live wire by described turn-off thyristor 6; Control the utmost point and connect respectively described controller 2 for two of described turn-off thyristor 6.Described controller 2 is controlled respectively magnitude of voltage and the current value in voltage sensor 3 and the real-time detection of grid 1 of current sensor 4, and receive testing result, then according to check result, calculate, the most backward turn-off thyristor 6 transmitted signals, control conducting and the cut-off of turn-off thyristor 6, and then automatically adjust the quantity of electric capacity 7 devices that drop into, compensating power, reduce the design capacity of generation and supply electric equipment, reduce investment, reduce line loss.
Preferably, between described zero line and live wire, be parallel with 10 compensating units 5.
Between described zero line and live wire, be parallel with 20 compensating units 5.
Referring to Fig. 1, controller 2 connects respectively AC power and ground.
Referring to Fig. 1 and Fig. 2, the reactive-load compensation method of reactive power compensator, comprises the following steps:
Magnitude of voltage in a, voltage sensor 3 detection of grid 1, and this magnitude of voltage is sent to controller 2; Current value in current sensor 4 detection of grid 1, and this magnitude of voltage is sent to controller 2; Setting power factor is 0.99;
B, described controller 2, by the magnitude of voltage and the current value that receive, are calculated the phase angle between current phasor and voltage vector, then calculate the power factor value at this phase angle;
The power factor value that c, basis are calculated, described controller 2, to turn-off thyristor 6 transmitted signals, is controlled the closed and disconnected of turn-off thyristor 6; And
D, described controller 2 continue to control respectively magnitude of voltage and the current value in voltage sensor 3 and current sensor 4 continuation detection of grid 1, and receive testing result, again judge, enter next duty cycle.
Referring to Fig. 2, further, described step c comprises the steps:
C1, when the power factor value of calculating is positioned at 0.99 ~ 1, described controller 2 is controlled respectively magnitude of voltage and the current value that voltage sensor 3 and current sensor 4 continues in detection of grid 1, and receives testing result, again judges; When the power factor value of calculating is not 0.99 ~ 1 time, whether the power factor value that further judgement is calculated is greater than 0;
If the power factor value that c2 calculates is greater than 0, a closed turn-off thyristor 6, electric capacity 7 conductings of connecting with these turn-off thyristor 6 electric capacity 7, then described controller 2 is controlled respectively voltage sensor 3 and current sensor 4 and is continued to detect and receive testing result, again judges; If the power factor value of calculating is less than 0, turn-off a turn-off thyristor 6, electric capacity 7 cut-off of connecting with these turn-off thyristor 6 electric capacity 7, then described controller 2 is controlled respectively voltage sensor 3 and current sensor 4 continues to detect and receive testing result, again judges.
Referring to Fig. 1, when described controller 2 sends high level to turn-off thyristor 6, turn-off thyristor 6 conductings; When described controller 2 sends low level to turn-off thyristor 6, turn-off thyristor 6 cut-offs.
Preferably, the expression formula of described power factor is as follows:
K=cos(Φ
1-Φ
2), 0 °=< Φ wherein
1<=90 °, 0 °=< Φ
2<=90 °, K represents power factor, Φ
1the phase angle that represents voltage.
The related data of each parameter sees the following form:
In the present embodiment, electrical network 1 can be 1 electricity, 2 two-phases electricity or 3 electricity mutually mutually, and electrical network is 1 mutually during electricity, and 1 voltage sensor 3 connects live wire and zero line simultaneously, and 14 of current sensor connects live wires; Electrical network was 2 whens electricity mutually, and 2 voltage sensors 3 connect respectively 1 live wire and 1 zero line simultaneously, and 2 current sensors 4 connect respectively 1 live wire; Electrical network was 3 whens electricity mutually, and 3 voltage sensors 3 connect respectively 1 live wire and 1 zero line simultaneously, and 3 current sensors 4 connect respectively 1 live wire.Under above-mentioned any one situation, every live wire only connects a voltage sensor 3 and a current sensor 4.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (6)
1. reactive power compensator, comprises electrical network and controller, it is characterized in that: described controller connects zero line and the live wire of described electrical network by voltage sensor, described controller connects the live wire of described electrical network by current sensor; Between described zero line and live wire, be parallel with 2 ~ 20 compensating units, each compensating unit comprises turn-off thyristor and the electric capacity being cascaded, and one end of described electric capacity connects zero line, and the other end of described electric capacity connects live wire by described turn-off thyristor; Control the utmost point and connect respectively described controller for two of described turn-off thyristor.
2. the reactive power compensator of stating according to claim 1, is characterized in that: controller connects respectively AC power and ground.
3. the reactive-load compensation method of reactive power compensator according to claim 1, is characterized in that: comprise the following steps:
Magnitude of voltage on a, voltage sensor senses electrical network, and this magnitude of voltage is sent to controller; Current value in current sensor detection of grid, and this magnitude of voltage is sent to controller; Setting power factor target lower limit;
B, described controller, by the magnitude of voltage and the current value that receive, are calculated the phase angle between current phasor and voltage vector, then calculate the power factor value at this phase angle;
The power factor value that c, basis are calculated, described controller, to turn-off thyristor transmitted signal, is controlled the closed and disconnected of turn-off thyristor; And
D, described controller continue to control respectively voltage sensor and current sensor continues magnitude of voltage and the current value in detection of grid, and receives testing result, again judges, enters next duty cycle.
4. the reactive-load compensation method of the reactive power compensator of stating according to claim 3, is characterized in that: described step c comprises the steps:
C1, when the power factor value of calculating is between set point and 1, described controller is controlled respectively voltage sensor and current sensor and is continued magnitude of voltage and the current value in detection of grid, and receives testing result, again judges; When the power factor value of calculating is not between set point and 1, whether the power factor value that further judgement is calculated is greater than 0;
If the power factor value that c2 calculates is greater than 0, a closed turn-off thyristor, electric capacity conducting with this turn-off thyristor capacitances in series, then described controller is controlled respectively magnitude of voltage and the current value in voltage sensor and current sensor continuation detection of grid, and receive testing result, again judge; If the power factor value of calculating is less than 0, a closed turn-off thyristor, electric capacity cut-off with this turn-off thyristor capacitances in series, then described controller is controlled respectively magnitude of voltage and the current value in voltage sensor and current sensor continuation detection of grid, and receive testing result, again judge.
5. the reactive-load compensation method of the reactive power compensator of stating according to claim 3, is characterized in that: when described controller sends high level to turn-off thyristor, and turn-off thyristor conducting; When described controller sends low level to turn-off thyristor, turn-off thyristor cut-off.
6. the reactive-load compensation method of the reactive power compensator of stating according to claim 3, is characterized in that: the expression formula of described power factor is as follows:
k=cos（Φ
1-Φ
2?）
Wherein, 0 °=< Φ
1<=90 °, 0 °=< Φ
2<=90 °, K represents power factor, Φ
1the phase angle that represents voltage, Φ
2the phase angle that represents electric current.
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| CN201410007940.3A CN103746386A (en) | 2014-01-08 | 2014-01-08 | Reactive compensation device and compensation method |
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| CN201410007940.3A CN103746386A (en) | 2014-01-08 | 2014-01-08 | Reactive compensation device and compensation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786518A (en) * | 2016-12-08 | 2017-05-31 | 国网山东省电力公司东明县供电公司 | Reduce the adjusting method and system of line loss |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1953891A1 (en) * | 2005-09-26 | 2008-08-06 | Ruitian Su | A customer intelligent reactive power automatic compensation energy-saved device |
| CN101577432A (en) * | 2008-06-19 | 2009-11-11 | 东方博沃（北京）科技有限公司 | Reactive power compensation method and control device adopting same |
| CN201805231U (en) * | 2010-06-02 | 2011-04-20 | 刘玉艳 | Dynamic reactive power compensation device |
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2014
- 2014-01-08 CN CN201410007940.3A patent/CN103746386A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1953891A1 (en) * | 2005-09-26 | 2008-08-06 | Ruitian Su | A customer intelligent reactive power automatic compensation energy-saved device |
| CN101577432A (en) * | 2008-06-19 | 2009-11-11 | 东方博沃（北京）科技有限公司 | Reactive power compensation method and control device adopting same |
| CN201805231U (en) * | 2010-06-02 | 2011-04-20 | 刘玉艳 | Dynamic reactive power compensation device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786518A (en) * | 2016-12-08 | 2017-05-31 | 国网山东省电力公司东明县供电公司 | Reduce the adjusting method and system of line loss |
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Application publication date: 20140423 |