CN107689626A - A kind of voltage-controlled method of direct current network - Google Patents

A kind of voltage-controlled method of direct current network Download PDF

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Publication number
CN107689626A
CN107689626A CN201610638409.5A CN201610638409A CN107689626A CN 107689626 A CN107689626 A CN 107689626A CN 201610638409 A CN201610638409 A CN 201610638409A CN 107689626 A CN107689626 A CN 107689626A
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China
Prior art keywords
voltage
pressure regulation
current conversion
conversion station
control
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CN201610638409.5A
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Chinese (zh)
Inventor
段军
孙维真
叶琳
张静
曹冬明
卢宇
丁久冬
张中锋
王文杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
State Grid Zhejiang Electric Power Co Ltd
NR Electric Co Ltd
NR Engineering Co Ltd
Original Assignee
State Grid Corp of China SGCC
State Grid Zhejiang Electric Power Co Ltd
NR Electric Co Ltd
NR Engineering Co Ltd
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Application filed by State Grid Corp of China SGCC, State Grid Zhejiang Electric Power Co Ltd, NR Electric Co Ltd, NR Engineering Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201610638409.5A priority Critical patent/CN107689626A/en
Publication of CN107689626A publication Critical patent/CN107689626A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

The present invention provides a kind of voltage-controlled method of direct current network,The control of direct current network voltage is divided into three processes,That is nature pressure regulation,Pressure regulation and secondary pressure regulation,Whether there is pressure regulation ability the current conversion station in direct current network to be divided into three classes according to current conversion station,That is Power Regulation current conversion station,Aid in pressure regulation current conversion station,Pressure regulation current conversion station,Power Regulation current conversion station is operated in constant dc power control pattern,Pressure regulation current conversion station, which is operated in, determines voltage mode control or boost voltage control model,Auxiliary Regulation Control current conversion station is operated in boost voltage control model,All current conversion stations in direct current network are involved in nature pressure regulation,Pressure regulation current conversion station and pressure regulation current conversion station is aided in participate in a pressure regulation,Pressure regulation current conversion station participates in secondary pressure regulation,Pass through the cooperation of three pressure regulation processes,The accurate control of DC voltage can be realized during stable state,DC voltage change can be suppressed during transient state.

Description

A kind of voltage-controlled method of direct current network
Technical field
The invention belongs to direct current network field, more particularly to a kind of voltage-controlled method of direct current network.
Background technology
With the continuous progress of Power Electronic Technique, direct current transmission and distribution skill of the flexible direct current transmission ＆ distribution power technology as a new generation Art can solve currently to exchange problems existing for transmission ＆ distribution power technology, with the expansion of direct current transportation scale, direct current network also into For possibility.
In direct current network, the status of DC voltage can analogize to the status of frequency in AC network, DC voltage The stable stabilization for being directly connected to DC power flow, it is related to the safe and stable operation of direct current network.Therefore, it is straight in direct current network The control for flowing voltage is of crucial importance.In traditional both ends flexible direct current system, one of change of current stand control DC voltage, separately Other variables of an outer change of current stand control, such as active power, a-c cycle or alternating voltage.If control DC voltage Change of current station failure is so as to losing DC voltage control ability, then DC voltage will unstability so as to causing both ends flexible direct current system System is stopped transport, and the reliability of system is relatively low.Often there are multiple current conversion stations that there is DC voltage control ability in direct current network, according to DC voltage control method common at present can be divided into list by the quantity that synchronization participates in the current conversion station of control DC voltage Point voltage control method and multipoint voltage control methods.
Single point voltage control methods use single current conversion station as DC voltage control station, because synchronization only has one to change Stand control DC voltage is flowed, therefore the accurate control of DC voltage can be realized, if this change of current station failure or power are out-of-limit So as to lose DC voltage control ability, then will there is the current conversion station adapter DC voltage of DC voltage control ability by other Control.Adapting method is divided into the zero deflection control methods based on communication and is not based on the deviation control of communication according to whether relying on communication Preparation method.Zero deflection control methods realize the conversion of DC voltage control power dependent on communication between quick station, when DC voltage control station The adapter for realizing DC voltage control power by communicating standby current conversion station between quickly standing after failure is out of service, but it is this Method proposes very high requirement to the speed and reliability that are communicated station, if communication delay is longer, in DC voltage control The adapter for being possible to have little time to realize DC voltage control power in the case of station failure is so that whole straight-flow system is stopped transport.Together When direct current network scale gradually increases, standby current conversion station also will gradually increase, the setting of the priority of DC voltage control Also it will become very complicated, high-speed communication network also will gradually become more complicated, and these defects cause the zero deflection based on communication to control Certain difficulty be present in popularization and application of the method in direct current network.
DC voltage error method is a kind of control mode without interior communication, i.e., is moved back in DC voltage control station failure After going out operation, the DC voltage control station of standby is able to detect that the relatively large deviation of DC voltage and is transferred to constant DC voltage control Pattern, ensure the stabilization of DC voltage, but multiple standby current conversion stations need multiple priority, add answering for controller design Miscellaneous degree, when direct current network scale gradually increases, standby current conversion station will also increase, because the DC voltage of direct current network has one Fixed range of operation, therefore deviation can not exceed DC voltage range of operation, which limits the differential and series of deviation control, These defects cause popularization and application of the deviation control methods in direct current network certain difficulty to be present.
There are multiple change of current stand control DC voltages in multipoint voltage control methods, i.e. synchronization direct current network, common is more Point voltage control method is slope voltage control methods.The active power output of this multiple slope voltage control current conversion stations of method is with AC line The impedance on road also has that respective slope is relevant, and DC voltage and active power can not all accomplish accurately to control.
Multiple direct current network voltage control is divided into three processes, i.e. nature pressure regulation, a pressure regulation and secondary voltage, according to changing Whether stream station there is pressure regulation ability the current conversion station in direct current network to be divided into three classes, i.e., Power Regulation current conversion station, auxiliary pressure regulation current conversion station, Pressure regulation current conversion station, Power Regulation current conversion station are operated in constant dc power control pattern, pressure regulation current conversion station be operated in determine voltage mode control or Boost voltage control model, auxiliary pressure regulation current conversion station are operated in boost voltage control model, all current conversion stations in direct current network Nature pressure regulation is involved in, aids in pressure regulation current conversion station and pressure regulation current conversion station to participate in a pressure regulation, pressure regulation current conversion station participates in secondary pressure regulation.
The content of the invention
The purpose of the present invention, it is to provide a kind of direct current network voltage-controlled method, can accurately controls during stable state straight Voltage is flowed, DC voltage deviation can be suppressed during transient state.
In order to reach above-mentioned purpose, the technical solution adopted by the present invention is：
A kind of voltage-controlled method of direct current network, the control of direct current network voltage is divided into three processes, i.e., adjusted naturally Pressure, a pressure regulation and secondary pressure regulation, whether there is pressure regulation ability the current conversion station in direct current network to be divided into three classes according to current conversion station, I.e. Power Regulation current conversion station, auxiliary pressure regulation current conversion station, pressure regulation current conversion station, Power Regulation current conversion station are operated in constant dc power control pattern, and pressure regulation is changed Stream station, which is operated in, determines voltage mode control or boost voltage control model, and auxiliary Regulation Control current conversion station is operated in boost voltage Control model, all current conversion stations in direct current network are involved in nature pressure regulation, aid in pressure regulation current conversion station and pressure regulation current conversion station to participate in Pressure regulation, pressure regulation current conversion station participate in secondary pressure regulation.
Above-mentioned natural pressure regulation is to utilize the capacitance energy storage of each current conversion station in direct current network, undertakes direct current network load first Change, when the unbalanced power in direct current network, the deviation of DC voltage will gradually increase with the time, the process of natural pressure regulation It is naturally done, it is not necessary to any adjustment means.
An above-mentioned pressure regulation is that the regulation of DC voltage is participated in using the current conversion station for being operated in boost voltage control model, most DC voltage is caused to form a deviation eventually, a pressure regulation is automatically performed by the controller of current conversion station itself, is adjusted without outside Control department is intervened.
Above-mentioned secondary pressure regulation is using the current conversion station for being operated in constant DC voltage control pattern or is operated in boost voltage The current conversion station of control model participates in the regulation of DC voltage, finally realizes the accurate control of DC voltage, the control of secondary pressure regulation Device either internally or externally regulates and controls department installed in current conversion station.
The implementation method of above-mentioned boost voltage control model is：
(1) DC voltage U is detecteddc；
(2) DC voltage U is calculateddcWith rated direct voltage UrateDeviation delta U=Udc-Urate；
(3) Δ U and voltage deviation definite value U are comparedsetHAnd UsetL(UsetH＞ UsetL) magnitude relationship, work as UsetL≤ΔU≤ UsetHWhen Δ Umod=0, as Δ U ＞ UsetHWhen Δ Umod=Δ U-UsetH, as Δ U ＜ UsetLWhen Δ Umod=Δ U-UsetL；
(4) power instruction deviation Δ P=K* Δs U is calculatedmod；
(5) the power instruction P issued according to top level control deviceorderPower control is calculated with power instruction deviation Δ P The power instruction P of device processedref=Porder-ΔP。
After such scheme, beneficial effects of the present invention are：
(1) DC voltage and power can be accurately controlled during stable state；
(2) DC voltage change can be suppressed during transient state；
(3) configuration high-speed communication channel is not needed.
Brief description of the drawings
Fig. 1 is the typical control model of direct current network transverter, and (a) is constant dc power control pattern, and (b) is boost voltage control Molding formula, (c) are to determine voltage mode control；
Fig. 2 is the voltage-controlled embodiment one of direct current network；
Fig. 3 is the voltage-controlled embodiment two of direct current network.
Embodiment
Below with reference to drawings and the specific embodiments, technical scheme is described in detail.
A kind of voltage-controlled method of direct current network, the control of direct current network voltage is divided into three processes, i.e., adjusted naturally Pressure, a pressure regulation and secondary pressure regulation, whether there is pressure regulation ability the current conversion station in direct current network to be divided into three classes according to current conversion station, I.e. Power Regulation current conversion station, auxiliary pressure regulation current conversion station, pressure regulation current conversion station, Power Regulation current conversion station are operated in constant dc power control pattern, and pressure regulation is changed Stream station, which is operated in, determines voltage mode control or boost voltage control model, and auxiliary Regulation Control current conversion station is operated in boost voltage Control model, all current conversion stations in direct current network are involved in nature pressure regulation, aid in pressure regulation current conversion station and pressure regulation current conversion station to participate in Pressure regulation, pressure regulation current conversion station participate in secondary pressure regulation.
It is above-mentioned state nature pressure regulation be utilize direct current network in each current conversion station capacitance energy storage, undertake direct current network load first Change, when the unbalanced power in direct current network, the deviation of DC voltage will gradually increase with the time, the mistake of natural pressure regulation Journey is naturally done, it is not necessary to any adjustment means.
It is above-mentioned state a pressure regulation be using be operated in boost voltage control model current conversion station participate in DC voltage regulation, DC voltage is finally caused to form a deviation, a pressure regulation is automatically performed by the controller of current conversion station itself, without outside Regulation and control department is intervened.
It is above-mentioned to state that secondary pressure regulation is using the current conversion station for being operated in constant DC voltage control pattern or to be operated in voltage auxiliary Help the current conversion station of control model to participate in the regulation of DC voltage, finally realize the accurate control of DC voltage, the control of secondary pressure regulation Device processed either internally or externally regulates and controls department installed in current conversion station.
The implementation method of above-mentioned boost voltage control model is：
(1) DC voltage U is detecteddc；
(2) DC voltage U is calculateddcWith rated direct voltage UrateDeviation delta U=Udc-Urate；
(3) Δ U and voltage deviation definite value U are comparedsetHAnd UsetL(UsetH＞ UsetL) magnitude relationship, work as UsetL≤ΔU≤ UsetHWhen Δ Umod=0, as Δ U ＞ UsetHWhen Δ Umod=Δ U-UsetH, as Δ U ＜ UsetLWhen Δ Umod=Δ U-UsetL；
(4) power instruction deviation Δ P=K* Δs U is calculatedmod；
(5) the power instruction P issued according to top level control deviceorderPower control is calculated with power instruction deviation Δ P The power instruction P of device processedref=Porder-ΔP。
Fig. 1 is the typical control model of direct current network transverter, wherein (a) is constant dc power control pattern, (b) is auxiliary electricity Control model is pressed, (c) is to determine voltage mode control.
There can only be one in DC network and determine voltage controller, the controller may be mounted at the top level controls such as power scheduling In device, it can also be arranged in current conversion station.In direct current network shown in Fig. 2, voltage controller is arranged in electric power dispatching system； Current conversion station 1 and current conversion station 2 are pressure regulation current conversion stations, and pressure regulation current conversion station is operated in boost voltage control model, receives voltage controller The power instruction issued；Current conversion station 3 is auxiliary pressure regulation current conversion station, is operated in boost voltage control model, receives power scheduling Power instruction；Current conversion station 4 is Power Regulation current conversion station, is operated in constant dc power control pattern, receives the power instruction of power scheduling.When straight The load of stream power network is when changing, the imbalance of the capacitance energy storage throughput power first of 4 current conversion stations, cause DC voltage by Gradually deviation, this process are exactly nature pressure regulation process；If voltage controller governing speed is relatively slow or communication delay is longer, that When DC voltage deviation reaches to a certain degree, the current conversion station 1, current conversion station 2 and the change of current of boost voltage control model are operated in 3 are stood by the respective value and power reference P of adjust automaticallyref, power-balance is kept so as to suppress the further deviation of DC voltage, this Individual process is exactly a pressure regulation process, and a pressure regulation can not realize the accurate control of DC voltage, and voltage controls after a period of time Device starts the automatic power instruction for changing current conversion station 1 and current conversion station 2, so as to realize the accurate control of DC voltage, while the change of current Stand 3 value and power reference Pref3It is restored to Porder3, this process is exactly secondary pressure regulation process；If voltage controller is adjusted It is sufficiently fast saving speed, communication delay is short enough, then secondary pressure regulation process has worked before a pressure regulation process works, Voltage controller is by changing Porder1And Porder2, keep power-balance to realize the accurate control of DC voltage.
In direct current network shown in Fig. 3, voltage controller is arranged in current conversion station；Current conversion station 1 and current conversion station 2 are that pressure regulation is changed Stream station, current conversion station 1, which is operated in, determines voltage mode control, and current conversion station 2 is operated in boost voltage control model, and current conversion station 2 receives electricity The power instruction of power scheduling；Current conversion station 3 is auxiliary pressure regulation current conversion station, is operated in boost voltage control model, receives power scheduling Power instruction；Current conversion station 4 is Power Regulation current conversion station, is operated in constant dc power control pattern, receives the power instruction of power scheduling.When When the load of direct current network changes, the imbalance of the capacitance energy storage throughput power first of 4 current conversion stations, cause DC voltage Gradual deviation, this process are exactly nature pressure regulation process；Voltage controller communication delay in current conversion station is shorter, regulation Speed, voltage controller is by changing Porder1And Porder2, keep power-balance to realize the accurate control of DC voltage System.After current conversion station 1 hinders out of service for some reason, the power of direct current network may not releveling, the capacitance energy storage of 4 current conversion stations is first The imbalance of first throughput power, causes the gradual deviation of DC voltage, and this process is exactly nature pressure regulation process；Current conversion station 2 passes through Adapter power voltage control is communicated, if communication delay is longer, then when DC voltage deviation reaches to a certain degree, be operated in auxiliary Help voltage mode control current conversion station 2 and current conversion station 3 by the respective value and power reference P of adjust automaticallyref, keep power-balance from And suppressing the further deviation of DC voltage, this process is exactly a pressure regulation process, and a pressure regulation can not realize DC voltage Accurate control, the adapter power voltage control of current conversion station 2, is switched to and determines voltage mode control after a period of time, so as to realize direct current The accurate control of voltage, while the value and power reference P of current conversion station 3ref3It is restored to Porder3, this process is exactly secondary tune Press through journey；If communication delay is short enough, then the adapter voltage control of current conversion station 2 before one time pressure regulation process works Power, secondary pressure regulation process has worked, so as to realize the accurate control of DC voltage.
The technological thought of above example only to illustrate the invention, it is impossible to protection scope of the present invention is limited with this, it is every According to technological thought proposed by the present invention, any change done on the basis of technical scheme, the scope of the present invention is each fallen within Within.

Claims (2)

  1. A kind of 1. voltage-controlled method of direct current network, it is characterised in that:By the control of direct current network voltage be divided into nature pressure regulation, Pressure regulation and secondary pressure regulation；
    Natural pressure regulation is to utilize the capacitance energy storage of each current conversion station in direct current network, Natural regulation direct current network DC voltage；When straight The deviation of DC voltage will gradually increase with the time when flowing the unbalanced power in power network；
    Pressure regulation is using the current conversion station regulation direct current network DC voltage for being operated in boost voltage control model, is finally caused DC voltage forms a deviation, and a pressure regulation is automatically performed by the controller of current conversion station itself, without outside regulation and control department Intervened；
    Secondary pressure regulation is the current conversion station for determining voltage mode control using being operated in or is operated in changing for voltage auxiliary control model Stream station regulation direct current network DC voltage, the accurate control of DC voltage is finally realized, the controller of secondary pressure regulation, which is arranged on, to be changed Stream station either internally or externally regulates and controls department.
  2. A kind of 2. voltage-controlled method of direct current network as claimed in claim 1, it is characterised in that：In the secondary pressure regulation, The implementation method of boost voltage control model is：
    (1) DC voltage U is detecteddc；
    (2) DC voltage U is calculateddcWith rated direct voltage UrateDeviation delta U=Udc-Urate；
    (3) two voltage deviation definite value U not of uniform size are setsetHAnd UsetL, UsetH＞ UsetL, compare Δ U and UsetH、UsetLSize Relation, work as UsetL≤ΔU≤UsetHWhen Δ Umod=0, as Δ U ＞ UsetHWhen Δ Umod=Δ U-UsetH, as Δ U ＜ UsetLWhen Δ Umod=Δ U-UsetL；
    (4) power instruction deviation Δ P=K* Δs U is calculatedmod, K is proportionality coefficient；
    (5) the power instruction P issued according to top level control deviceorderPower controller is calculated with power instruction deviation Δ P Power instruction Pref=Porder-ΔP。
CN201610638409.5A 2016-08-05 2016-08-05 A kind of voltage-controlled method of direct current network Pending CN107689626A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104578187A (en) * 2015-01-04 2015-04-29 南方电网科学研究院有限责任公司 Multi-end flexible direct current power transmission system level coordination control device
CN105870909A (en) * 2016-03-30 2016-08-17 南京南瑞继保电气有限公司 DC network voltage control method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104578187A (en) * 2015-01-04 2015-04-29 南方电网科学研究院有限责任公司 Multi-end flexible direct current power transmission system level coordination control device
CN105870909A (en) * 2016-03-30 2016-08-17 南京南瑞继保电气有限公司 DC network voltage control method

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