CN104158196B - A kind of line voltage compensation system based on SVG - Google Patents
A kind of line voltage compensation system based on SVG Download PDFInfo
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- CN104158196B CN104158196B CN201410416392.XA CN201410416392A CN104158196B CN 104158196 B CN104158196 B CN 104158196B CN 201410416392 A CN201410416392 A CN 201410416392A CN 104158196 B CN104158196 B CN 104158196B
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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
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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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Abstract
The present invention relates to a kind of line voltage compensation system based on SVG, this system has the advantage that (1) can be based on the voltage x current information of multiple nodes of the distribution wire of acquisition in real time, and real time stepless is adjustable carries out voltage and reactive-load compensation.(2), when soft-start module makes SVG start, the SVG impact to electrical network is reduced.(3) there is good Man machine interaction, the compensation policy of the SVG of intervention in real time that can be artificial.
Description
Art
The present invention relates to a kind of line voltage compensation system based on SVG.
Background technology
China's current town and country 10kV distribution network system, also exist that radius of electricity supply is big, seaonal load variation is big,
Circuit reactive loss is big, power factor is low, reactive power can not the problem such as in-situ balancing, especially because work
In industry production, the existence of substantial amounts of non-linear, impact and wavy load brings the most serious to electrical network
Power quality problem, the serious voltage stabilization that have impact on electrical network, just threatening power system and subscriber equipment
Often run.Solve these problems, for saving energy and decreasing loss, improve power distribution network power supply quality and the warp of power supply enterprise
The aspects such as Ji benefit, will obtain obvious actual effect.
For compensating reactive power, keeping the line voltage stabilization of power distribution network, reactive power compensation technology is the most all electric
Study hotspot in engineering field, compared with SVC dynamic reactive compensator, static reacance generator has benefit
Time of repaying is fast, can Continuous Compensation, be not likely to produce resonance, the advantage such as harmonic wave of certain time can be compensated.Therefore,
Low pressure SVG is a kind of preferably approach 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 by controlling physical quantity
Mode processed, reactive current control mode, Reactive Power Control mode and complex controll mode.Described compound control
Mode processed includes again voltage and reactive power complex controll mode, reactive power and power factor complex controll side
Formula, and voltage and power factor complex controll mode.
SVG in power distribution network is essentially all employing wholly-controled device (such as IGBT) and PWM controls.Low
In the start-up course of pressure SVG, owing between inverter side and net side, the inductance value of linked reactor is less, direct current
There is larger capacitance side, directly initiates SVG if uncontrolled, can produce the biggest inrush current, should
Electrically and mechanically impact caused by inrush current will cause starting unsuccessfully, even can threaten equipment
Safety.Soft start is the rush of current in suppression start-up course and DC voltage such as overcharges at the unfavorable factor, protects
Card SVG can the starting and the key technology devoted oneself to work smoothly of safety and steady.
Summary of the invention
For solving the problems referred to above, the present invention provides a kind of line voltage compensation system based on SVG, by this is
System, can the fluctuation situation of the idle and voltage of detection load immediately, carry out switching adaptively, real-time nothing
Level is adjustable to be compensated line voltage, maintains the voltage stabilization of power distribution network.This system, when switching, uses nothing
The mode of impact soft start, can reduce the impact to electrical network.
To achieve these goals, the present invention provides a kind of line voltage compensation system based on SVG, this system
Including:
First voltage sample module, for the information of voltage of multiple spot of the supply line of Real-time Collection power distribution network；
First current sample module, for the information of voltage of 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 system and distribution wire can be turned off；
Soft-start module, realizes the soft start of SVG system for auxiliary；
Three-phase inverter bridge circuit, one end and above-mentioned Capacitor banks connect, 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 catalyst is connected；
Inverter circuit controller, for controlling the shutoff of the electrical switch of three-phase inverter bridge circuit, thus controls
Make idle compensation dosage；
Middle control module, for controlling the collaborative work of this SVG system all parts, controls module and includes in this:
Arithmetic element, for receiving voltage electricity from the first voltage acquisition module and the first current acquisition module
Stream information stores, and the data timing of storage is analyzed computing, forms average power factor data；
Logical analysis unit, carries out above-mentioned average power factor logical analysis, and divides according to the result analyzed
Do not start different SVG reactive-load compensation Compensation Strategies, carry out reactive-load compensation；
Feedback unit, the reactive-load compensation that the average power factor after reactive-load compensation and logic analysis module are made
Front average power factor compares, the control strategy to reactive-load compensator of correction logic analytic unit.
Preferably, described middle control module also includes man-machine interaction unit, for made by logical analysis unit
The control strategy of SVG shows, if monitoring personnel find that mistake occurs in control strategy, passes through man-machine interaction
The module manual correction control strategy to SVG.
Preferably, described soft-start module includes: soft start resistance and soft start catalyst, described soft opens
Galvanic electricity resistance two ends are connected in parallel described soft start catalyst, and this soft start catalyst is for tying in soft start-up process
After bundle, soft start resistance is bypassed.
Preferably, described voltage x current information includes: voltage magnitude, frequency, current amplitude, voltage and electricity
Stream phase contrast.
Preferably, described three-phase inverter bridge circuit uses IGCT three phase inverter bridge.
Preferably, described system also includes the second voltage of the voltage and current information for gathering Capacitor banks
Acquisition module and the second current acquisition module.
The line voltage compensation system based on SVG that the present invention provides has the advantage that (1) can be based on reality
Time the voltage x current information of multiple nodes of distribution wire that obtains, real time stepless is adjustable carries out voltage and idle
Compensate.(2), when soft-start module makes SVG start, the SVG impact to electrical network is reduced.(3) have good
Good Man machine interaction, the compensation policy of the SVG of intervention in real time that can be artificial.
Accompanying drawing explanation
Fig. 1 shows the block diagram of a kind of based on SVG line voltage compensation system of the present invention；
Fig. 2 shows the particular make-up of the middle control module in Fig. 1 in system.
Detailed description of the invention
Fig. 1 shows the block diagram according to the present invention, and to achieve these goals, the present invention provides a kind of base
In the line voltage compensation system of SVG, this system include middle control module 6, soft-start module 5, main contactor 12,
Three-phase inverter bridge circuit 4, inverter circuit controller 7, Capacitor banks the 3, first voltage sample module 8,
First current sample module the 9, second current acquisition module 10 and the second voltage acquisition module 11.
First voltage sample module 9, for the information of voltage of multiple spot of the supply line of Real-time Collection power distribution network,
Such as gather the information of voltage of multiple load 1-n junction, and these information of voltage are averaging processing.
First current sample module 10, for the information of voltage of multiple spot of the supply line of Real-time Collection power distribution network, adopts
Collect the current information of multiple load 1-n junction, and these current informations are averaging processing.These electricity
Current voltage information may include but be not limited to: voltage magnitude, frequency, current amplitude, voltage and current phase contrast.
Capacitor banks 3, for providing capacitive reactive power for power distribution network, can be composed in series by multiple DC capacitors.
Main contactor 12, is same as the connection that SVG system and distribution wire 1 can be turned off.
Soft-start module 5, realizes the soft start of SVG system for auxiliary.Described soft-start module one end and three
Phase bridge inverter main circuit be connected, the other end with wish that catalyst is connected.Described soft-start module includes: soft start
Resistance 51 and soft start catalyst 52, described soft start resistance 51 two ends are connected in parallel described soft start and connect
Tentaculum 52, this soft start catalyst 52 is for bypassing soft start resistance 51 after soft start-up process terminates.
Three-phase inverter bridge circuit 4, one end and Capacitor banks 3 connect, and the other end connects soft-start module 5,
This three-phase inverter bridge circuit is preferably formed by during IGCT.
Inverter circuit controller 7, for controlling the shutoff of the electrical switch of three-phase inverter bridge circuit, thus controls
Making idle compensation dosage, this controller 7 can use the IGCT controller that this area is same.
Second voltage acquisition module 10 and the second current acquisition module 11, gathers voltage and the electricity of Capacitor banks 3
Stream information.
Middle control module 6, for controlling the collaborative work of this SVG system all parts, controls module 6 and includes in this:
Arithmetic element 61, for receiving from the first voltage acquisition module 8 and the first current acquisition module 9
Voltage x current information stores, and the data timing of storage is analyzed computing, formed mean power because of
Number data.
Logical analysis unit 62, carries out logical analysis by above-mentioned average power factor, and according to the result analyzed
It is respectively started different SVG reactive-load compensation Compensation Strategies, carries out reactive-load compensation.
Feedback unit 63, the average power factor after reactive-load compensation is idle with what logic analysis module 62 was made
Average power factor before compensation compares, the control to reactive-load compensator of correction logic analytic unit 62
Strategy.
Described middle control module also includes man-machine interaction unit 64, for the SVG made by logical analysis unit 62
Control strategy show, if monitoring personnel find that mistake occurs in control strategy, by man-machine interaction mould
The block manual correction control strategy to SVG.
Native system is used to enter specifically comprising the following steps that of row line voltage and reactive-load compensation
(1) first voltage sample module 8 and the monitoring of the first current sample module 9 real-time collecting distribution wire 1
The voltage and current information of point, and the data collected are transferred to the arithmetic element 61 of middle control module 6；
(2) the voltage x current information received is stored by arithmetic element 61, and by the information timing of storage
It is analyzed computing, forms average power factor data；
(3) above-mentioned average power factor is carried out logical analysis by logical analysis unit 62, and according to analyzing knot
Really result is respectively started different reactive-load compensation strategies and carries out reactive-load compensation；
(4) feedback unit is by the average power factor after reactive-load compensation and logical analysis unit in step (3)
Average power factor before the reactive-load compensation obtained compares analysis, correction logic analyze module to SVG
Control strategy；
(5) the classification knot that step (3) and logical analysis unit in step (4) are made by man-machine interaction unit
Really and the control strategy of SVG is shown, if monitoring personnel find that mistake occurs in control strategy, pass through
The human-computer interaction module manual correction control strategy to reactive-load compensator.
In step (2), the every 2-5 minute information to storing of arithmetic element carries out once-through operation analysis, draws
One average power factor data.
In step (3), logical analysis unit carries out logical analysis to average power factor and comprises the following steps:
(31) average power factor deriving from multiple monitoring point is defined as user terminal level mean power because of
Number；
(32) ratio of each load terminal capacity Yu its place distribution line capacity is defined as this user eventually
The weighter factor of end, with weighter factor sum all of under distribution wire equal to 1, will derive from same distribution wire
It is distribution line that the load terminal level average power factor on road is multiplied by the mean value definition after its weighter factor
Average power factor.
The soft start step of native system is as follows:
(1) in, control module 6 judges that the magnitude of voltage of distribution wire 1 and frequency values are the most normal；
(2) when distribution wire magnitude of voltage and frequency values are normal, main contactor 12 is closed, by SVG system and electricity
Net connects, and enters pre-charging stage；
(3) after described pre-charging stage terminates, the middle control module 6 distribution wire 1 three-phase voltage signal to gathering
Carry out dq coordinate transform and phase-locked, it is thus achieved that the electric voltage frequency of distribution wire and phase information；
(4) in, control module 6 utilizes the line voltage frequency and phase information obtained, and is produced and electricity by computing
The sine pulse width modulation (PWM) ripple signal of net voltage synchronous, is exported to three phase inverter bridge by inverter circuit controller；
(5) open loop control mode is used to gradually reduce described sine pulse width modulation (PWM) wave modulation ratio, until Capacitor banks
The DC voltage of 3 reaches load voltage value, stops output sine pulse width modulation (PWM) ripple and closes soft start catalyst 52,
Excision soft start resistance 51, terminating without impact soft start-up process of low pressure SVG, enter the follow-up operation stage.
Further, the pre-charge process described in step (2), electrical network is by IGCT three phase inverter bridge
Anti-paralleled diode constitute three-phase uncontrollable rectifier circuit to DC bus capacitor device charge, the second voltage sample mould
Block 11 and the second current sample module 12, the voltage of sensing capacitor group 3 and charging current value, treat DC side
When condenser voltage value stabilization and charging current are zero, pre-charging stage terminates.
Above content is to combine concrete preferred implementation further description made for the present invention, no
Can assert the present invention be embodied as be confined to these explanations.Common for the technical field of the invention
For technical staff, without departing from the inventive concept of the premise, make some equivalents and substitute or obvious modification,
And performance or purposes are identical, protection scope of the present invention all should be considered as belonging to.
Claims (1)
1. a line voltage compensation system based on SVG, it is characterised in that this system includes:
First voltage sample module, for the information of voltage of multiple spot of the supply line of Real-time Collection power distribution network；
First current sample module, for the current information of 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 system and distribution wire can be turned off；
Soft-start module, realizes the soft start of SVG system for auxiliary；
Three-phase inverter bridge circuit, one end and above-mentioned Capacitor banks connect, and the other end connects soft-start module；
Described soft-start module one end is connected with three-phase inverter bridge circuit, and the other end is connected with main contactor；
Inverter circuit controller, for controlling the shutoff of the electrical switch of three-phase inverter bridge circuit, thus controls idle compensation dosage；
Middle control module, for controlling the collaborative work of this SVG system all parts, controls module and includes in this:
Arithmetic element, for the voltage x current information from the first voltage sample module and the first current sample module received being stored, and is analyzed computing by the data timing of storage, forms average power factor data；
Logical analysis unit, carries out above-mentioned average power factor logical analysis, and is respectively started different SVG reactive-load compensation Compensation Strategies according to the result analyzed, carry out reactive-load compensation；
Feedback unit, the average power factor before the reactive-load compensation make the average power factor after reactive-load compensation and logic analysis module compares, the control strategy to reactive-load compensator of correction logic analytic unit；
Described middle control module also includes man-machine interaction unit, and the control strategy of the SVG for being made by logical analysis unit shows, if monitoring personnel find that mistake occurs in control strategy, by the human-computer interaction module manual correction control strategy to SVG；
Described soft-start module includes: soft start resistance and soft start catalyst, and described soft start resistance two ends are connected in parallel described soft start catalyst, and this soft start catalyst is for bypassing soft start resistance after soft start-up process terminates；
Described voltage x current information includes: voltage magnitude, electric voltage frequency, current amplitude, voltage and current phase contrast；
The voltage and current information of the monitoring point of the first voltage sample module and the first current sample module real-time collecting distribution wire, and the data collected are transferred to the arithmetic element of middle control module；
The voltage x current information received is stored by arithmetic element, and the information timing of storage is analyzed computing, forms average power factor data；
Above-mentioned average power factor is carried out logical analysis by logical analysis unit, and is respectively started different reactive-load compensation strategies according to analysis result and carries out reactive-load compensation；
Average power factor before the reactive-load compensation that average power factor after reactive-load compensation and logical analysis unit are obtained by feedback unit compares analysis, and correction logic analyzes the control strategy to SVG of module；
Classification results that logical analysis unit is made by man-machine interaction unit and the control strategy of SVG being shown, if monitoring personnel find that mistake occurs in control strategy, by the human-computer interaction module manual correction control strategy to reactive-load compensator；
Wherein, the every 2-5 minute information to storing of arithmetic element carries out once-through operation analysis, draws average power factor data；
Wherein, that average power factor is carried out logic analysis process is as follows for logical analysis unit:
The average power factor deriving from multiple monitoring point is defined as user terminal level average power factor；
The ratio of each load terminal capacity Yu its place distribution line capacity is defined as the weighter factor of this user terminal, with weighter factor sum all of under distribution wire equal to 1, the user terminal level average power factor deriving from same distribution line is multiplied by the average power factor that the mean value definition after its weighter factor is distribution line；
The soft start-up process of native system is as follows:
Middle control module judges that the magnitude of voltage of distribution wire and frequency values are the most normal；
When distribution wire magnitude of voltage and frequency values are normal, close main contactor, SVG system is connected with electrical network, enter pre-charging stage；
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, it is thus achieved that the electric voltage frequency of distribution wire and phase information；
Middle control module utilizes the line voltage frequency and phase information obtained, and by the sine pulse width modulation (PWM) ripple signal that computing generation is Tong Bu with line voltage, is exported to three-phase inversion bridge circuit by inverter circuit controller；
Open loop control mode is used to gradually reduce described sine pulse width modulation (PWM) wave modulation ratio, until the DC voltage of Capacitor banks reaches load voltage value, stop output sine pulse width modulation (PWM) ripple and close soft start catalyst, excision soft start resistance, terminating without impact soft start-up process of low pressure SVG, enter the follow-up operation stage
Wherein, described pre-charge process is particularly as follows: electrical network constitutes three-phase uncontrollable rectifier circuit to the charging of DC bus capacitor device by the anti-paralleled diode in IGCT three-phase inversion bridge circuit, 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.
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| CN104979836A (en) * | 2015-06-23 | 2015-10-14 | 国家电网公司 | Power grid reactive compensation method and system |
| CN106505530B (en) * | 2016-11-09 | 2019-02-01 | 许继电气股份有限公司 | A kind of guard method of the low-voltage distribution cabinet based on SVG grid connection test and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103311936A (en) * | 2013-06-28 | 2013-09-18 | 江苏国源电气有限公司 | Control method for 3300V five-level anti-explosion reactive power compensation device |
| CN103532146A (en) * | 2013-10-24 | 2014-01-22 | 北京华东电气股份有限公司 | Electronic APF/SVG soft start device |
| CN103855717A (en) * | 2014-03-27 | 2014-06-11 | 安徽工业大学 | Pulse-free soft starting method of low-voltage SVG (static var generator) |
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| JPH06175741A (en) * | 1992-12-07 | 1994-06-24 | Mitsubishi Electric Corp | Static reactive power generating device |
| CN102222922B (en) * | 2011-06-10 | 2013-01-23 | 湖南大学 | STATCOM (static synchronous compensator) control system adopting droop control strategy and control method thereof |
| CN102299520B (en) * | 2011-09-02 | 2013-08-14 | 北京四方华能电气设备有限公司 | Reactive power compensation method and system for micro power grid |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311936A (en) * | 2013-06-28 | 2013-09-18 | 江苏国源电气有限公司 | Control method for 3300V five-level anti-explosion reactive power compensation device |
| CN103532146A (en) * | 2013-10-24 | 2014-01-22 | 北京华东电气股份有限公司 | Electronic APF/SVG soft start device |
| CN103855717A (en) * | 2014-03-27 | 2014-06-11 | 安徽工业大学 | Pulse-free soft starting method of low-voltage SVG (static var generator) |
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