CN104242317B - A kind of SVG operation/cutting method for line voltage compensation - Google Patents
A kind of SVG operation/cutting method for line voltage compensation Download PDFInfo
- Publication number
- CN104242317B CN104242317B CN201410418799.6A CN201410418799A CN104242317B CN 104242317 B CN104242317 B CN 104242317B CN 201410418799 A CN201410418799 A CN 201410418799A CN 104242317 B CN104242317 B CN 104242317B
- Authority
- CN
- China
- Prior art keywords
- voltage
- svg
- module
- soft start
- soft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The present invention relates to a kind of SVG operation/cutting method for line voltage compensation, the method is when switching, adopt the mode without impacting soft start, the impact to electrical network can be reduced, in addition the method is passed through, can the fluctuation situation of the idle and voltage of detection load immediately, carry out switching adaptively, maintain the voltage stabilization of power distribution network.
Description
Technical field
The present invention relates to a kind of SVG operation/cutting method for line voltage compensation.
Background technology
China's current town and country 10kV distribution network system, also exist that radius of electricity supply is large, seaonal load variation is large, circuit reactive loss is large, power factor is low, reactive power can not the problem such as in-situ balancing, particularly because the existence of non-linear, impact a large amount of in industrial production and wavy load brings day by day serious power quality problem to electrical network, the serious voltage stabilization that have impact on electrical network, threatens the normal operation of electric power system and subscriber equipment.Address these problems, for saving energy and decreasing loss, the aspect such as economic benefit improving power distribution network power supply quality and power supply enterprise, obvious actual effect will be obtained.
For compensating reactive power, keep the line voltage stabilization of power distribution network, reactive power compensation technology is all the study hotspot in electrical engineering field all the time, compared with SVC dynamic reactive compensator, static reacance generator have the make-up time fast, can Continuous Compensation, not easily produce resonance, the advantages such as the harmonic wave of certain time can be compensated.Therefore, low pressure SVG is the better approach of one solving above-mentioned user side power quality problem at present.
SVG prior art switching determination strategy, is divided into power factor controlling mode, voltage control mode, reactive current control mode, Reactive Power Control mode and complex controll mode by control physical quantity.Described complex controll mode comprises again voltage and reactive power complex controll mode, reactive power and power factor complex controll mode, and voltage and power factor complex controll mode.
SVG in power distribution network adopts wholly-controled device (as IGBT) and PWM to control.In the start-up course of low pressure SVG, because between inverter side and net side, the inductance value of linked reactor is less, DC side has comparatively bulky capacitor, control directly to start SVG if do not added, very large inrush current can be produced, electric and mechanical shock caused by this inrush current will cause starting unsuccessfully, even can threaten device security.Soft start suppresses the unfavorable factors such as the rush of current in start-up course and DC voltage overcharge, and ensures that SVG can the startup of safety and steady the key technology of devoting oneself to work smoothly.
Summary of the invention
For solving the problem, the invention provides a kind of SVG operation/cutting method for line voltage compensation, the method is when switching, adopt the mode without impacting soft start, can impact to electrical network be reduced, in addition by the method, can the fluctuation situation of the idle and voltage of detection load immediately, carry out switching adaptively, maintain the voltage stabilization of power distribution network.
To achieve these goals, the invention provides a kind of SVG operation/cutting method for line voltage compensation, this SVG comprises:
First voltage sample module, for the information of voltage of the multiple spot of the supply line of Real-time Collection power distribution network;
First current sample module, for the information of voltage of the multiple spot of the supply line of Real-time Collection power distribution network;
Capacitor banks, for providing capacitive reactive power for power distribution network;
Main contactor, is same as the connection that SVG and distribution wire can be turned off;
Soft-start module, for the auxiliary soft start realizing SVG, described soft-start module comprises: soft start resistance and soft start contactor, described soft start resistance two ends are connected in parallel described soft start contactor, and this soft start contactor is used for the bypass of soft start resistance after soft start-up process terminates;
Three-phase inverter bridge circuit, one end is connected with above-mentioned Capacitor banks, and the other end connects soft-start module;
Described soft-start module one end is connected with three-phase inverter bridge circuit, the other end with wish that contactor is connected;
Inverter circuit controller, for controlling the shutoff of the electronic switch of three-phase inverter bridge circuit, thus controls idle compensation rate;
Middle control module, for controlling the collaborative work of this SVG all parts;
The method comprises the steps:
(1) in control module judge the magnitude of voltage of distribution wire and frequency values whether normal;
(2) until distribution wire magnitude of voltage and frequency values normal time, closed main contactor, is connected SVG system with electrical network, enters pre-charging stage;
(3) after described pre-charging stage terminates, middle control module carries out dq coordinate transform and phase-locked to the distribution wire three-phase voltage signal gathered, and obtains electric voltage frequency and the phase information of distribution wire;
(4) in, control module utilizes the line voltage frequency and phase information that obtain, by the sine pulse width modulation (PWM) ripple signal that computing generation is synchronous with line voltage, exports three phase inverter bridge to by inverter circuit controller;
(5) open loop control mode is adopted progressively to reduce described sine pulse width modulation (PWM) wave modulation ratio, until the DC voltage of Capacitor banks reaches load voltage value, stop exporting sine pulse width modulation (PWM) ripple and closed soft start contactor, excision soft start resistance, low pressure SVG terminates without impacting soft start-up process, enters the follow-up operation stage.
Further, pre-charge process described in step (2), electrical network forms three-phase uncontrollable rectifier circuit by the anti-paralleled diode in IGCT three phase inverter bridge and charges to DC bus capacitor device, second voltage sample module and the second current sample module, the voltage of sensing capacitor group and charging current value, when DC bus capacitor device magnitude of voltage is stable and charging current is zero, pre-charging stage terminates.
Preferably, described middle control module comprises: arithmetic element, logic analysis unit, feedback unit and man-machine interaction unit, and the method also comprises the steps: after step (5)
The voltage and current information of the monitoring point of (6) first voltage sample modules and the first current sample module real-time collecting distribution wire, and by the transfer of data that the collects arithmetic element to middle control module;
(7) the electric current and voltage information received stores by arithmetic element, and analytic operation is carried out in the timing of the information of storage, forms average power factor data;
(8) above-mentioned average power factor is carried out logic analysis by logic analysis unit, and starts different reactive power compensation strategies respectively according to analysis result result and carry out reactive power compensation;
(9) average power factor before the reactive power compensation that obtained by logic analysis unit in the average power factor after reactive power compensation and step (3) of feedback unit compares analysis, the control strategy to SVG of correction logic analysis module;
(10) man-machine interaction unit classification results that logic analysis unit in step (3) and step (4) is made and the control strategy of SVG is shown, if monitor staff finds that mistake appears in control strategy, by the control strategy of human-computer interaction module manual correction to reactive-load compensator.
Operation/cutting method tool provided by the invention has the following advantages: can based on the electric current and voltage information of multiple nodes of the distribution wire of Real-time Obtaining, when adopting soft-start mode that SVG is started, reduce SVG to the impact of electrical network, upon actuation, compensation policy can be adjusted in real time, make the voltage of distribution wire keep stable.
Accompanying drawing explanation
Fig. 1 shows the block diagram of the line voltage compensation system of a kind of SVG of the present invention;
Fig. 2 shows the concrete composition of the middle control module in Fig. 1 in system;
Fig. 3 shows the flow chart of operation/cutting method of the present invention.
Embodiment
Fig. 1 shows according to block diagram of the present invention, to achieve these goals, the invention provides a kind of SVG operation/cutting method for line voltage compensation, this system comprises middle control module 6, soft-start module 5, main contactor 12, three-phase inverter bridge circuit 4, inverter circuit controller 7, Capacitor banks 3, first voltage sample module 8, first current sample module 9, second current acquisition module 10 and the second voltage acquisition module 11.
First voltage sample module 9, for the information of voltage of the multiple spot of the supply line of Real-time Collection power distribution network, such as gathers the information of voltage of multiple load 1-n junction, and is averaging processing by these information of voltage.First current sample module 10, for the information of voltage of the multiple spot of the supply line of Real-time Collection power distribution network, gathers the current information of multiple load 1-n junction, and is averaging processing by these current informations.These electric current and voltage information can include but not limited to: voltage magnitude, frequency, current amplitude, voltage and current phase difference.
Capacitor banks 3, for providing capacitive reactive power for power distribution network, can be composed in series by multiple DC capacitor.
Main contactor 12, is same as the connection that SVG system and distribution wire 1 can be turned off.
Soft-start module 5, for the auxiliary soft start realizing SVG system.Described soft-start module one end is connected with three-phase inverter bridge circuit, the other end with wish that contactor is connected.Described soft-start module comprises: soft start resistance 51 and soft start contactor 52, and described soft start resistance 51 two ends are connected in parallel described soft start contactor 52, this soft start contactor 52 for after terminating in soft start-up process by soft start resistance 51 bypass.
Three-phase inverter bridge circuit 4, one end is connected with Capacitor banks 3, and the other end connects soft-start module 5, and this three-phase inverter bridge circuit preferably forms by during IGCT.
Inverter circuit controller 7, for controlling the shutoff of the electronic switch of three-phase inverter bridge circuit, thus controls idle compensation rate, the IGCT controller that this controller 7 can adopt this area same.
Second voltage acquisition module 10 and the second current acquisition module 11, gathers the voltage and current information of Capacitor banks 3.
Middle control module 6, for controlling the collaborative work of this SVG system all parts, controlling module 6 in this and comprising:
Arithmetic element 61, stores for receiving electric current and voltage information from the first voltage acquisition module 8 and the first current acquisition module 9, and the data timing of storage is carried out analytic operation, forms average power factor data.
Logic analysis unit 62, carries out logic analysis by above-mentioned average power factor, and starts different SVG reactive power compensation Compensation Strategies respectively according to the result analyzed, and carries out reactive power compensation.
Feedback unit 63, the average power factor before the reactive power compensation make the average power factor after reactive power compensation and logic analysis module 62 compares, the control strategy to reactive-load compensator of correction logic analytic unit 62.
Described middle control module also comprises man-machine interaction unit 64, and the control strategy for the SVG made by logic analysis unit 62 shows, if monitor staff finds that mistake appears in control strategy, by the control strategy of human-computer interaction module manual correction to SVG.
See Fig. 3, adopt the concrete steps of above-mentioned SVG system switching as follows:
Preferably, before above-mentioned steps S1, also comprise a SVG soft start-up process, concrete steps are as follows:
S1. in control module 6 judge the magnitude of voltage of distribution wire 1 and frequency values whether normal;
S2. until distribution wire magnitude of voltage and frequency values normal time, closed main contactor 12, is connected SVG system with electrical network, enters pre-charging stage;
S3. after described pre-charging stage terminates, middle control module 6 carries out dq coordinate transform and phase-locked to distribution wire 1 three-phase voltage signal gathered, and obtains electric voltage frequency and the phase information of distribution wire;
S4. in, control module 6 utilizes the line voltage frequency and phase information that obtain, by the sine pulse width modulation (PWM) ripple signal that computing generation is synchronous with line voltage, exports three phase inverter bridge to by inverter circuit controller;
S5. open loop control mode is adopted progressively to reduce described sine pulse width modulation (PWM) wave modulation ratio, until the DC voltage of Capacitor banks 3 reaches load voltage value, stop exporting sine pulse width modulation (PWM) ripple and closed soft start contactor 52, excision soft start resistance 51, low pressure SVG terminates without impacting soft start-up process, enters the follow-up operation stage;
S6. the voltage and current information of the monitoring point of the first voltage sample module 8 and the first current sample module 9 real-time collecting distribution wire 1, and by the transfer of data that the collects arithmetic element 61 to middle control module 6;
S7. the electric current and voltage information received stores by arithmetic element 61, and analytic operation is carried out in the timing of the information of storage, forms average power factor data;
S8. above-mentioned average power factor is carried out logic analysis by logic analysis unit 62, and starts different reactive power compensation strategies respectively according to analysis result result and carry out reactive power compensation;
S9. the average power factor before the reactive power compensation that obtained by logic analysis unit in the average power factor after reactive power compensation and step (3) of feedback unit compares analysis, the control strategy to SVG of correction logic analysis module;
S10. man-machine interaction unit classification results that logic analysis unit in step (3) and step (4) is made and the control strategy of SVG is shown, if monitor staff finds that mistake appears in control strategy, by the control strategy of human-computer interaction module manual correction to reactive-load compensator.
Further, pre-charge process described in step S2, electrical network forms three-phase uncontrollable rectifier circuit by the anti-paralleled diode in IGCT three phase inverter bridge and charges to DC bus capacitor device, second voltage sample module 11 and the second current sample module 12, the voltage of sensing capacitor group 3 and charging current value, when DC bus capacitor device magnitude of voltage is stable and charging current is zero, pre-charging stage terminates.
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, make some equivalent to substitute or obvious modification, and performance or purposes identical, all should be considered as belonging to protection scope of the present invention.
Claims (1)
1., for a SVG operation/cutting method for line voltage compensation, this SVG comprises:
First voltage sample module, for the information of voltage of the multiple spot of the supply line of Real-time Collection power distribution network;
First current sample module, for the information of voltage of the multiple spot of the supply line of Real-time Collection power distribution network;
Capacitor banks, for providing capacitive reactive power for power distribution network;
Main contactor, is same as the connection that SVG and distribution wire can be turned off;
Soft-start module, for the auxiliary soft start realizing SVG, described soft-start module comprises: soft start resistance and soft start contactor, described soft start resistance two ends are connected in parallel described soft start contactor, and this soft start contactor is used for the bypass of soft start resistance after soft start-up process terminates;
Three-phase inverter bridge circuit, one end is connected with above-mentioned Capacitor banks, and the other end connects soft-start module;
Described soft-start module one end is connected with three-phase inverter bridge circuit, the other end with wish that contactor is connected;
Inverter circuit controller, for controlling the shutoff of the electronic switch of three-phase inverter bridge circuit, thus controls idle compensation rate;
Middle control module, for controlling the collaborative work of this SVG all parts;
The method comprises the steps:
(1) in control module judge the magnitude of voltage of distribution wire and frequency values whether normal;
(2) until distribution wire magnitude of voltage and frequency values normal time, closed main contactor, is connected SVG system with electrical network, enters pre-charging stage;
(3) after described pre-charging stage terminates, middle control module carries out dq coordinate transform and phase-locked to the distribution wire three-phase voltage signal gathered, and obtains electric voltage frequency and the phase information of distribution wire;
(4) in, control module utilizes the line voltage frequency and phase information that obtain, by the sine pulse width modulation (PWM) ripple signal that computing generation is synchronous with line voltage, exports three phase inverter bridge to by inverter circuit controller;
(5) open loop control mode is adopted progressively to reduce described sine pulse width modulation (PWM) wave modulation ratio, until the DC voltage of Capacitor banks reaches load voltage value, stop exporting sine pulse width modulation (PWM) ripple and closed soft start contactor, excision soft start resistance, low pressure SVG terminates without impacting soft start-up process, enters the follow-up operation stage;
Pre-charge process described in step (2) is specific as follows, electrical network forms three-phase uncontrollable rectifier circuit by the anti-paralleled diode in IGCT three phase inverter bridge and charges to DC bus capacitor device, second voltage sample module and the second current sample module, the voltage of sensing capacitor group and charging current value, when DC bus capacitor device magnitude of voltage is stable and charging current is zero, pre-charging stage terminates;
Described middle control module comprises: arithmetic element, logic analysis unit, feedback unit and man-machine interaction unit, and the method also comprises the steps: after step (5)
The voltage and current information of the monitoring point of (6) first voltage sample modules and the first current sample module real-time collecting distribution wire, and by the transfer of data that the collects arithmetic element to middle control module;
(7) the electric current and voltage information received stores by arithmetic element, and analytic operation is carried out in the timing of the information of storage, forms average power factor data;
(8) above-mentioned average power factor is carried out logic analysis by logic analysis unit, and starts different reactive power compensation strategies respectively according to analysis result and carry out reactive power compensation;
(9) average power factor before the reactive power compensation that obtained by logic analysis unit in the average power factor after reactive power compensation and step (3) of feedback unit compares analysis, the control strategy to SVG of correction logic analysis module;
(10) man-machine interaction unit classification results that logic analysis unit in step (3) and step (4) is made and the control strategy of SVG is shown, if monitor staff finds that mistake appears in control strategy, by the control strategy of human-computer interaction module manual correction to reactive-load compensator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410418799.6A CN104242317B (en) | 2014-08-22 | 2014-08-22 | A kind of SVG operation/cutting method for line voltage compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410418799.6A CN104242317B (en) | 2014-08-22 | 2014-08-22 | A kind of SVG operation/cutting method for line voltage compensation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104242317A CN104242317A (en) | 2014-12-24 |
| CN104242317B true CN104242317B (en) | 2016-02-17 |
Family
ID=52229904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410418799.6A Active CN104242317B (en) | 2014-08-22 | 2014-08-22 | A kind of SVG operation/cutting method for line voltage compensation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104242317B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253309B (en) * | 2016-08-31 | 2018-09-28 | 湖北华辰凯龙电力有限公司 | It is a kind of integrate the compensation of active dynamic filter, power factor regulation power factor controller |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103312139B (en) * | 2012-03-09 | 2016-05-11 | 台达电子工业股份有限公司 | A kind of starting drive of combining inverter and control method thereof |
| CN202633951U (en) * | 2012-05-10 | 2012-12-26 | 广东中钰科技有限公司 | Dynamic reactive power compensator based on IGBT high voltage control |
| CN102832682A (en) * | 2012-08-07 | 2012-12-19 | 国网电力科学研究院武汉南瑞有限责任公司 | High-power charging and discharging machine with reactive compensation function |
| CN103532146B (en) * | 2013-10-24 | 2015-06-17 | 北京华东电气股份有限公司 | Electronic APF/SVG soft start device |
| CN103855717B (en) * | 2014-03-27 | 2015-11-18 | 安徽工业大学 | The nothing of a kind of low pressure SVG impacts soft-start method |
-
2014
- 2014-08-22 CN CN201410418799.6A patent/CN104242317B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104242317A (en) | 2014-12-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103036462B (en) | Model prediction control method of voltage source type rectifier when network voltage is unbalanced | |
| CN102142684B (en) | High-voltage direct-hanging type scalable vector graphics (SVG) comprehensive control device and comprehensive control method | |
| CN104362631B (en) | A kind of high-power idle control method with the dynamic mixing compensation system of harmonic wave | |
| CN104009486B (en) | The asymmetry compensation current-limiting method of a kind of three-phase three-wire system SVG | |
| CN105048453B (en) | A kind of electric power spring topology and its control method | |
| CN103078526A (en) | Current source type rectifier and grid-connected control method based on virtual resistor | |
| CN103855717B (en) | The nothing of a kind of low pressure SVG impacts soft-start method | |
| CN107230983A (en) | A kind of electric power spring application system and its control method based on Power Control | |
| CN110943461A (en) | Intelligent integrated power distribution device applied to low-voltage transformer area and method thereof | |
| CN103928946A (en) | Smooth switching control method for three-phase dual-mode inverter | |
| CN204615400U (en) | There is the Power Quality Comprehensive Treatment Device of short-circuit current-limiting function | |
| CN104617581B (en) | A kind of soft start control method of four bridge legs Active Power Filter-APF | |
| CN104158197B (en) | A kind of line voltage compensation method based on SVG | |
| CN104410083B (en) | Capacitance midpoint potential balancing device on SVG (Static VAR Generator) direct current side and control method of capacitance midpoint potential balancing device | |
| CN105071390A (en) | Control method of H-bridge three-level active power filter and system | |
| CN104135015A (en) | Soft starting method improved based on H-bridge cascade STATCOM (Static Synchronous Compensator) | |
| CN201928035U (en) | High voltage linear type SVG integrated control device | |
| CN104242317B (en) | A kind of SVG operation/cutting method for line voltage compensation | |
| CN104158196B (en) | A kind of line voltage compensation system based on SVG | |
| CN103457267A (en) | Space vector pulse width modulation control method of three-phase parallel active electric filter | |
| CN202797977U (en) | Power electronic system combining voltage support with fault current limiting | |
| CN105375490B (en) | A kind of energy conservation transmission voltage compensation method | |
| CN103414190A (en) | Multi-target loss reduction device | |
| CN204046172U (en) | A kind of active electric power filtering controller based on dual core processor | |
| CN203056998U (en) | Current source type rectifier based on virtual resistor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zeng Maoliang Inventor after: Xie Junhe Inventor after: Luo Jian Inventor after: Fang Fei Inventor before: Zeng Maoliang Inventor before: Xie Junhe Inventor before: Luo Jian |
|
| COR | Change of bibliographic data | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160309 Address after: Tianchen 610000 Chengdu Road, Sichuan province high tech Zone No. 88 No. 6 Building 4 unit 2 floor Patentee after: CHENGDU AISHUO TECHNOLOGY CO., LTD. Address before: 610000 No. 9, No. 9, 18 venture Road, hi tech Zone, Sichuan, Chengdu Patentee before: CHENGDU MYSOOW ELECTRICAL CO., LTD. |