CN102545222A - Distributed power flow controller based on line cubic harmonic wave - Google Patents
Distributed power flow controller based on line cubic harmonic wave Download PDFInfo
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- CN102545222A CN102545222A CN201110432026XA CN201110432026A CN102545222A CN 102545222 A CN102545222 A CN 102545222A CN 201110432026X A CN201110432026X A CN 201110432026XA CN 201110432026 A CN201110432026 A CN 201110432026A CN 102545222 A CN102545222 A CN 102545222A
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- 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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention relates to a distributed power flow controller based on line cubic harmonic waves, comprising a power transmission line, wherein a first Y-delta type transformer and a second Y-delta type transformer are installed on two ends of the power transmission line; a power flow controller unit is installed on the power transmission line; the distributed power flow controller also comprises a cubic harmonic power supply, wherein the cubic harmonic power supply is connected with a neutral point of the Y-type winding of the first Y-delta type transformer; the neutral point of the Y-type winding of the second Y-delta type transformer is grounded; the power flow controller unit comprises a converter, wherein a positive pole of the converter direct-current side is connected with one end of a capacitor; the negative pole of the converter direct-current side is connected with the other end of the capacitor; the converter is connected with the power transmission line in series by a single-turn coupling transformer; the converter is connected with an output end of the controller; an input end of the controller is connected with a current mutual inductor and a voltage mutual inductor on the power transmission line. The invention can improve reliability of the power transmission line.
Description
Technical field
The present invention relates to the flexible AC transmission technical field, relate in particular to a kind of distributed flow controller based on circuit 3 subharmonic.
Background technology
Along with distributed power generation (DG; Distributed generation) development of technology; Increasing middle-size and small-size DG is inserted the power distribution network side of electric power system; It is reverse that traditional fixing trend that is transmitted to power distribution network by power transmission network takes place in the access of a large amount of DG, based on the variability of regenerative resource DG owing to weather, makes whole transmission system required power control be used to compensate the intermittence of DG; The continuous growth of customer charge needs the power delivery ability of trend control device raising existing line, to slow down or to reduce the needs of expensive newly-built circuit; Power between interconnection blocks, causes the existence of huge line loss circulating power and the two-way trend between interconnection to need suitable trend control; Just complicated Power Exchange needs frequent trend control between flourish intelligent grid and electricity market.Therefore, in transmission line, increase the assurance that suitable trend control appliance and method are following power network safety operation.
THE UPFC (Unified power flow controller; UPFC) be the most powerful tidal current controller of present function; It is regulated through line impedance, voltage phase angle and voltage magnitude to electric power system, can be simultaneously or realize the control of electrical system bus voltage, circuit active power trend, reactive power trend and system stability independently.Yet function so powerful UPFC is not widely used in electric power system; Main cause is following: 1, UPFC is by back-to-back two identical current transformer (VSC; Voltage source converter) is coupled to form through dc capacitor; The fault of any point all will be delivered to whole transmission line through dc capacitor, cause the paralysis of whole transmission line; 2, UPFC often adopts powerful 3-phase power converter, and between phase and phase High-Voltage Insulation makes its cost of investment high in addition.
Therefore, we press for a kind of new flow controller, and not only having can be simultaneously or realize the function of the control of electrical system bus voltage, circuit active power trend, reactive power trend and system stability independently, and cost is low, dependable performance.
Summary of the invention
Technical problem to be solved by this invention provides that a kind of cost is low, the distributed flow controller based on circuit 3 subharmonic of dependable performance.
The present invention for the technical scheme that problem adopted of the above-mentioned proposition of solution is: a kind of distributed flow controller based on circuit 3 subharmonic; Comprise transmission line; Be respectively equipped with a Y-Δ type transformer and the 2nd Y-Δ type transformer at the two ends of transmission line; Transmission line is provided with the flow controller unit; This distributed flow controller also comprises 3 subharmonic power supplys, and 3 subharmonic power supplys are connected with the neutral point of the Y type winding of a Y-Δ type transformer, the neutral ground of the Y type winding of the 2nd Y-Δ transformer; Described flow controller unit comprises current transformer; The positive pole of current transformer DC side is connected with electric capacity one end; The negative pole of current transformer DC side is connected with the electric capacity other end; Current transformer is linked in the transmission line through single turn coupling transformer series connection, and described current transformer is connected with the output of controller, the input of controller respectively with transmission line on current transformer be connected with voltage transformer.
Press such scheme, described flow controller unit has a plurality of, and series connection inserts in the transmission line.
Press such scheme, described current transformer is made up of switching tube and diode, and described switching tube has four, forms the single-phase full bridge circuit; Diode of inverse parallel plays afterflow on each switching tube.
The method of transmission line trend is controlled in utilization based on the distributed flow controller of circuit 3 subharmonic:
The first step: in the transmission line that two ends are connected by Y-Δ type transformer; The neutral point of one end transformer Y type winding is connected with 3 subharmonic power supplys (can produce the AC power that frequency is the 150Hz alternating current); The neutral ground of other end transformer Y type winding forms 3 subharmonic currents (frequency is the alternating current of 150Hz) path.
Second step: current transformer and dc capacitor series connection back are linked in the transmission line through the series connection of single turn coupling transformer.
The 3rd step: controller starts; Dc capacitor voltage value that measures and the given error that relatively obtains with reference to dc voltage value produce 3 subharmonic voltage reference signals control current transformer through controller, and (3 subharmonic voltage reference signals are sent into PWM generator and are produced pwm signal; The control current transformer), 3 subharmonic current rectifications are charged to dc capacitor.
The 4th step: the direct voltage of dc capacitor reach set-point and stable after; Through foreign current instrument transformer and the voltage transformer that is connected with transmission line, electric current that collects and voltage signal are sent into the signal generation fundamental voltage reference signal that power computation module (power computation module measures the effective value U of fundamental voltage, the effective value I of fundamental current and the phase angle difference
of voltage and electric current and utilizes formula
to calculate the active power P and the reactive power Q of circuit first-harmonic) calculates the circuit real-time reactive power of real sum of errors and obtains through controller with reference to the error that reactive power relatively obtains.The time active power and reactive power.In real time active power and given relatively obtains with reference to active power
The 5th step: the signal that the fundamental voltage reference signal stack that the 3 subharmonic voltage reference signals that the 3rd step was produced and the 4th step produce obtains is sent into PWM generator generation pwm signal; The control current transformer; Make the current transformer inversion go out to comprise the voltage of fundametal compoment; Act on the transmission line, thereby realize real-time control the transmission line trend.
Utilize 3 subharmonic currents in the transmission line, active power is provided, keep the constant and inversion of dc capacitor voltage and go out fundamental voltage, control the trend of transmission line in real time in the line current transformer of series connection.
Beneficial effect of the present invention is: 1, change in the past UPFC by back-to-back two types of attachment that identical current transformer is coupled to form through dc capacitor; Two current transformers are connect dc capacitor respectively; Make two current transformers independently of one another, improved reliability.2, series connection a plurality of flow controllers unit (adopting distributed connected mode) on transmission line; The capacity of each current transformer is diminished; Adopt single capacitor or several capacitor parallel connections as energy-storage travelling wave tube; And the current transformer capacity of UPFC is very big, needs hundreds of capacitor parallel connections as energy-storage travelling wave tube.Thereby each flow controller unit compensation degree is very little, and capacitor direct current voltage is generally about 500V, than the 40KV of UPFC, can reduce the insulation costs of equipment greatly, and is easy to utilize.
Description of drawings
Fig. 1 is the distributed flow controller structural representation based on circuit 3 subharmonic
Fig. 2 is a converter structure sketch map among Fig. 1.
Fig. 3 is Fig. 1 middle controller control block diagram.
Fig. 4 is an instance that inserts transmission line based on the distributed flow controller of circuit 3 subharmonic.
Among the figure: 1-current transformer, 2-single-turn transformer, 3-current transformer, 4-voltage transformer; The 5-transmission pressure, 6-direct current capacitor, 7-switching tube, 8-diode; 9-flow controller unit, 10-the one Y-Δ type transformer, 11-3 subharmonic power supply, 12-the 2nd Y-Δ type transformer.
Embodiment
Further specify embodiments of the invention below in conjunction with accompanying drawing.
Referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4; A kind of distributed flow controller based on circuit 3 subharmonic; Comprise the transmission line 5 that is provided with flow controller unit 9; The neutral point that is respectively equipped with the Y type winding of a Y-Δ type transformer 10 and the 2nd Y-Δ type transformer 12, the one Y-Δ type transformers 10 at the two ends of transmission line 5 is connected the neutral ground of the Y type winding of the 2nd Y-Δ transformer 12 with 3 subharmonic power supplys 11; Described flow controller unit 9 comprises current transformer 1; The positive pole of current transformer 1 DC side is connected with dc capacitor 6 one ends; The negative pole of current transformer 1 DC side is connected with dc capacitor 6 other ends; Current transformer 1 is linked in the transmission line 5 through single turn coupling transformer 2 series connection, and described current transformer 1 is connected with the output of controller, the input of controller respectively with transmission line 5 on current transformer 3 be connected with voltage transformer 4.
In the such scheme, described flow controller unit 9 can have a plurality of, and series connection inserts in the transmission line 5.
Press such scheme, described current transformer 1 is made up of switching tube 7 and diode 8, and described switching tube 7 has four, forms the single-phase full bridge circuit; Diode 8 of inverse parallel plays afterflow on each switching tube 7.
Referring to Fig. 4, because 3 subharmonic can be stopped by " Δ " side of transformer naturally, therefore 3 subharmonic will not flow into the system outside this distributed flow controller place circuit.
9 series connection of flow controller unit insert in transmission line, and after putting into operation, the line current I that current transformer 3 collects obtains 3 subharmonic current phase angle signal θ through 3 subharmonic filters and single-phase PLL phase-locked loop
3Set up the rotating coordinate system of third harmonic voltage with this.The direct voltage V of the direct current capacitor 6 that measures
Se, dcWith with reference to dc voltage value V
Se, dc, refThe signal ref that the error that relatively obtains obtains through the PI controller
V, se, 3, dD axle component as 3 subharmonic voltages.Owing to only need 3 subharmonic to inject active power, the q axle component ref of 3 subharmonic voltages
V, se, 3, qBe made as 0; To obtain 3 subharmonic current phase angle signal θ
3, 3 subharmonic voltages the q axle component of d axle component, 3 subharmonic voltages obtain 3 subharmonic voltage reference signal ref through after the single-phase dq transformation calculations
V, se, 3, this signal is sent into PWM generator and is produced pwm signal, and 7 actions of control current transformer 1 trigger switch pipe work under the state of 3 subharmonic rectifications current transformer 1, after the 3 subharmonic currents process current transformer rectification in the circuit direct current capacitor 6 are charged.
After dc capacitor voltage was stabilized in set point, current transformer 3 and voltage transformer 4 were sent the current signal I that collects and voltage signal V into power computation module (power computation module are measured the effective value U of fundamental voltage, the effective value I of fundamental current and the phase angle difference of voltage and electric current
Utilize formula
Calculate the active power P and the reactive power Q of circuit first-harmonic) calculate real-time active power P of circuit and reactive power Q, voltage V obtains fundamental voltage phase angle signal θ through first-harmonic filter and single-phase PLL phase-locked loop
1Set up the rotating coordinate system of fundamental voltage with this.Reactive power Q with reference to reactive power Q
RefThe signal ref that the error that relatively obtains obtains through the PI controller
V, se, 1, dD axle component as fundamental voltage.Active power P with reference to active power P
RefThe signal ref that the error that relatively obtains obtains through the PI controller
V, se, 1, qQ axle component as fundamental voltage.With the phase angle signal θ that obtains fundamental voltage
1, fundamental voltage the q axle component of d axle component, fundamental voltage obtain fundamental voltage reference signal ref through after the single-phase dq transformation calculations
V, se, 1, fundamental voltage reference signal that obtains and the stack of 3 subharmonic voltage reference signals obtain voltage reference signal ref
V, seSend into PWM generator and produce pwm signal, 7 actions of control current transformer 1 trigger switch pipe.This moment, current transformer 1 worked under the state of 3 subharmonic rectifications, first-harmonic inversion; 3 subharmonic currents in the circuit through the current transformer rectification after to direct current capacitor 6 chargings keep dc voltage stability; Direct current capacitor 6 is as energy-storage travelling wave tube; Go out to comprise the voltage of fundametal compoment through current transformer 1 outside inversion, thereby realize real-time control the circuit trend.
The method of transmission line trend is controlled in utilization based on the distributed flow controller of circuit 3 subharmonic:
The first step: in the transmission line that two ends are connected by Y-Δ type transformer; The neutral point of one end transformer Y type winding is connected with 3 subharmonic power supplys (can produce the AC power that frequency is the 150Hz alternating current); The neutral ground of other end transformer Y type winding forms 3 subharmonic currents (frequency is the alternating current of 150Hz) path.
Second step: current transformer and dc capacitor series connection back are linked in the transmission line through the series connection of single turn coupling transformer.
The 3rd step: controller starts; Dc capacitor voltage value that measures and the given error that relatively obtains with reference to dc voltage value produce 3 subharmonic voltage reference signals control current transformer through controller, and (3 subharmonic voltage reference signals are sent into PWM generator and are produced pwm signal; The control current transformer), 3 subharmonic current rectifications are charged to dc capacitor.
The 4th step: the direct voltage of dc capacitor reach set-point and stable after; Through foreign current instrument transformer and the voltage transformer that is connected with transmission line, the electric current that collects and voltage signal are sent into power computation module (power computation module measures the effective value U of fundamental voltage, the effective value I of fundamental current and the phase angle difference
of voltage and electric current and utilizes formula
to calculate the active power P and the reactive power Q of circuit first-harmonic) calculate real-time active power of circuit and reactive power.In real time active power and the given signal generation fundamental voltage reference signal that obtains through controller with reference to active power real-time reactive power of sum of errors that relatively obtains and the error that relatively obtains with reference to reactive power.
The 5th step: the signal that the fundamental voltage reference signal stack that the 3 subharmonic voltage reference signals that the 3rd step was produced and the 4th step produce obtains is sent into PWM generator generation pwm signal; The control current transformer; Make the current transformer inversion go out to comprise the voltage of fundametal compoment; Act on the transmission line, thereby realize real-time control the transmission line trend.
The present invention can realize transmission line active power and reactive power are independently controlled, owing to adopt distributed control, on the basis that does not change existing transmission line structure, can transform transmission line, realizes the real-time control of circuit trend.
The above; Only being preferred embodiment of the present invention, is not that the present invention is done any pro forma restriction, and those skilled in the art utilize the technology contents of above-mentioned announcement to make a little simple modification; Equivalent variations or modification all drop in protection scope of the present invention.
Claims (3)
1. distributed flow controller based on circuit 3 subharmonic; Comprise transmission line; Be respectively equipped with a Y-Δ type transformer and the 2nd Y-Δ type transformer at the two ends of transmission line, transmission line is provided with the flow controller unit, it is characterized in that: this distributed flow controller also comprises 3 subharmonic power supplys; 3 subharmonic power supplys are connected with the neutral point of the Y type winding of a Y-Δ type transformer, the neutral ground of the Y type winding of the 2nd Y-Δ transformer; Described flow controller unit comprises current transformer; The positive pole of current transformer DC side is connected with electric capacity one end; The negative pole of current transformer DC side is connected with the electric capacity other end; Current transformer is linked in the transmission line through single turn coupling transformer series connection, and described current transformer is connected with the output of controller, the input of controller respectively with transmission line on current transformer be connected with voltage transformer.
2. the distributed flow controller based on circuit 3 subharmonic as claimed in claim 1 is characterized in that: described flow controller unit has a plurality of, and series connection inserts in the transmission line.
3. the distributed flow controller based on circuit 3 subharmonic as claimed in claim 1, it is characterized in that: described current transformer is made up of switching tube and diode, and described switching tube has four, forms the single-phase full bridge circuit; Diode of inverse parallel plays afterflow on each switching tube.
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Cited By (8)
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| CN104333000A (en) * | 2014-11-26 | 2015-02-04 | 国家电网公司 | Distributed series-coupled type power flow controller |
| WO2015135264A1 (en) * | 2014-03-12 | 2015-09-17 | 国家电网公司 | Automatic direct-current magnetic bias compensation device of measurement winding of current transformer |
| CN105162105A (en) * | 2015-09-22 | 2015-12-16 | 中国科学院电工研究所 | DC power supply power flow controller topology |
| CN105610158A (en) * | 2016-02-06 | 2016-05-25 | 武汉理工大学 | Distributed power flow controller and control method therefor |
| CN107086576A (en) * | 2017-06-02 | 2017-08-22 | 武汉理工大学 | A kind of Distributed Power Flow controller Multiple Time Scales mathematical model establishing method |
| CN108988345A (en) * | 2018-08-01 | 2018-12-11 | 华中科技大学 | A kind of Distributed Power Flow controller series unit control method for coordinating |
| CN109245105A (en) * | 2018-09-06 | 2019-01-18 | 国电南瑞科技股份有限公司 | A kind of Distributed Power Flow control method and system |
| CN111308908A (en) * | 2019-12-24 | 2020-06-19 | 武汉理工大学 | dSPACE-based closed loop simulation test method for parallel side of distributed power flow controller |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015135264A1 (en) * | 2014-03-12 | 2015-09-17 | 国家电网公司 | Automatic direct-current magnetic bias compensation device of measurement winding of current transformer |
| CN104333000A (en) * | 2014-11-26 | 2015-02-04 | 国家电网公司 | Distributed series-coupled type power flow controller |
| CN105162105A (en) * | 2015-09-22 | 2015-12-16 | 中国科学院电工研究所 | DC power supply power flow controller topology |
| CN105162105B (en) * | 2015-09-22 | 2017-12-08 | 中国科学院电工研究所 | A kind of direct current network flow controller topology |
| CN105610158A (en) * | 2016-02-06 | 2016-05-25 | 武汉理工大学 | Distributed power flow controller and control method therefor |
| CN105610158B (en) * | 2016-02-06 | 2018-04-27 | 武汉理工大学 | A kind of Distributed Power Flow controller and its control method |
| CN107086576A (en) * | 2017-06-02 | 2017-08-22 | 武汉理工大学 | A kind of Distributed Power Flow controller Multiple Time Scales mathematical model establishing method |
| CN107086576B (en) * | 2017-06-02 | 2019-07-23 | 武汉理工大学 | A kind of Distributed Power Flow controller Multiple Time Scales mathematical model establishing method |
| CN108988345A (en) * | 2018-08-01 | 2018-12-11 | 华中科技大学 | A kind of Distributed Power Flow controller series unit control method for coordinating |
| CN109245105A (en) * | 2018-09-06 | 2019-01-18 | 国电南瑞科技股份有限公司 | A kind of Distributed Power Flow control method and system |
| CN111308908A (en) * | 2019-12-24 | 2020-06-19 | 武汉理工大学 | dSPACE-based closed loop simulation test method for parallel side of distributed power flow controller |
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Application publication date: 20120704 |