CN107612013A - A kind of direct current network voltage range control method - Google Patents

A kind of direct current network voltage range control method Download PDF

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Publication number
CN107612013A
CN107612013A CN201710822374.5A CN201710822374A CN107612013A CN 107612013 A CN107612013 A CN 107612013A CN 201710822374 A CN201710822374 A CN 201710822374A CN 107612013 A CN107612013 A CN 107612013A
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voltage
direct current
current
network
dcref
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CN201710822374.5A
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CN107612013B (en
Inventor
卢宇
董云龙
汪楠楠
王佳成
姜崇学
胡兆庆
李钢
丁久东
王柯
随顺科
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NR Electric Co Ltd
NR Engineering Co Ltd
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NR Electric Co Ltd
NR Engineering Co Ltd
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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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

The present invention relates to a kind of direct current network voltage range control method, belong to direct current transportation field.Generally interconnected between the current conversion station of soft straight power network by long transmission line, the pressure drop of circuit both ends is larger, in order to which stable state occur over-pressed or under-voltage, it is necessary to control the DC voltage of the whole network in the range of operation of design for DC line one end when preventing operation.The present invention is mainly disposed to determine in the change of current station control system of DC voltage, gather the busbar voltage of each current conversion station on direct current network and pass through direct current network range of operation control strategy, the DC bus-bar voltage control at voltage station will be determined in suitable section, to ensure that the DC bus-bar voltage of each current conversion station of direct current network is operated within the voltage range of design.The present invention is to ensureing that whole direct current network voltage stabilization has important directive significance.

Description

A kind of direct current network voltage range control method
Technical field
The invention belongs to Power System Flexible technical field of direct current power transmission, and in particular to a kind of direct current network voltage range control Method processed.
Background technology
Under same direct current rack, the multiterminal current conversion station system that is made up of two or more current conversion station, may make up can realize it is more Power supply is powered and the powered direct current network of more drop points, has higher economy and flexibility.What multiterminal inverter system was formed The important prerequisite of direct current network stable operation is the stabilization of DC voltage, the same with the frequency stabilization in AC system, direct current The voltage stability tool of net is of great significance.Existing system-level DC voltage controller is broadly divided into the control with communication System and the class of control two without communication, when whole direct current network stable operation, determine the control strategy at DC voltage station not only Need to ensure the DC voltage stability of this current conversion station, it is also necessary to ensure the DC bus-bar voltage of each current conversion station on whole direct current network Operation is in allowed limits, it is therefore desirable to which each non-DC voltage for determining voltage commutation station is coordinated.
In view of being interconnected between the current conversion station of direct current network by long transmission line, the pressure drop of circuit both ends is larger, in order to prevent running When DC line one end occur that stable state is over-pressed or under-voltage, ensure the DC voltage of the whole network in the range of operation of design, it is necessary to It is proposed a kind of direct current network voltage range control method for being suitable for engineer applied.
The content of the invention
The purpose of the present invention is to propose to a kind of direct current network voltage range control method, and this method, which is generally located on, determines direct current The current conversion station of voltage, gather the busbar voltage of each current conversion station on direct current network using communication between station or upper strata communication apparatus and lead to Direct current network range of operation control strategy is crossed, the DC bus-bar voltage for determining voltage station is controlled in suitable section, it is straight to ensure The DC bus-bar voltage of stream each current conversion station of power network is operated within the scope of design.
To achieve the above object, the present invention adopts the following technical scheme that：A kind of direct current network voltage range control method, institute The multiterminal current conversion station system that direct current network refers to be made up of two or more current conversion station is stated, the current conversion station is mutual by DC line Contact forms DC network；
The control method is set in the current conversion station of constant DC voltage control, direct current where each current conversion station of collection direct current network The voltage of bus；According to the DC bus-bar voltage of each current conversion station and DC voltage setting value UdcrefIt is inclined to obtain DC voltage instruction Poor correction value；Drift correction value and DC voltage setting value U are instructed according to DC voltagedcrefThe reference at voltage station is determined in adjustment in real time Value, so that whole network voltage is within zone of reasonableness.
Further, this method specifically comprises the following steps：
1) the voltage U of dc bus where gathering each current conversion station of direct current networkdcmean1、Udcmean2~UdcmeanN；Wherein N is The total number of current conversion station in direct current network；For n-th current conversion station to determine DC voltage station, the station DC bus-bar voltage is UdcmeanN；
2) the AC three-phase voltage U at DC voltage station is determined in collectionL, ABC, AC three-phase electric current IL, ABC, AC electric voltage frequency F, and Voltage Reference phase theta is obtained according to AC electric voltage frequency fref；
3) DC voltage range of operation control algolithm is used, handles the DC bus-bar voltage of each current conversion station collected Udcmean1、Udcmean2~UdcmeanNWith DC voltage setting value Udcref, obtain DC voltage instruction drift correction value Δ Udcref；
4) DC voltage instruction drift correction value Δ U is handleddcrefAnd DC voltage setting value Udcref, obtain watt current Reference value Idref；
5) electrical quantity collected in 2) is obtained into reactive current by alternating voltage control or Reactive Power Control to refer to Value Iqref；
6) by watt current reference value Idref, reactive current reference value IqrefWith system voltage reference phase θrefAs changing Stream device control signal, which is exported to each transverter, the output watt current of each transverter, follows active current reference value IdrefAnd Reactive current follows reactive current reference value Iqref。
Further, control system between station by communicating or gathering each current conversion station of direct current network by upper strata communication apparatus The voltage of place dc bus.
Further, the DC voltage setting value U at DC voltage station is determineddcrefBy top level control equipment or other external device (ED)s There is provided, or set manually.
Further, employ DC voltage range of operation control algolithm in step 3), calculate and each non-to determine DC voltage Current conversion station and determine the pole busbar voltage deviation delta U between DC voltage current conversion stationdcmeank, wherein 1≤k≤N-1, calculation expression It is as follows：
ΔUdcmean1=UdcmeanN-Udcmean1
ΔUdcmean2=UdcmeanN-Udcmean2
……
ΔUdcmeank=UdcmeanN-Udcmeank
Take Δ UdcmeankIn maximum Δ Udcmean_maxAnd as DC voltage instruction drift correction value Δ Udcref。
Further, the DC voltage setting value U at DC voltage station is determineddcrefChoose one of following setting value：
A) it is setting value to choose the whole network highest operating voltage；
B) it is setting value to choose the whole network minimum operation voltage；
C) setting value chosen is less than the whole network ceiling voltage limit value, and is higher than the whole network minimum voltage limit value.
Further, the concrete operations of the step 4) are：By voltage instruction drift correction value Δ UdcrefAnd DC voltage Setting value UdcrefDeviation delta U carry out proportional integration adjust to obtain watt current reference value Idref, and ensured by amplitude limit link Watt current reference value IdrefIt is not out-of-limit, wherein：
Δ U=Udcref-ΔUdcref。
Further, the multiterminal current conversion station system, DC voltage station quantity is determined for one, and the dc bus is just Pole bus or negative electrode bus.
Further, watt current reference value IdrefNot out-of-limit finger watt current reference value IdrefAllowing the active of operation Current minimum IdminWith watt current maximum IdmaxBetween, i.e.,：
Idmin≤Idref≤Idmax。
Further, any transverter uses Current Vector Control in each transverter described in step 6).
Beneficial effects of the present invention are：
(1) present invention utilizes the control to determining voltage commutation station, by each current conversion station straight edge line of whole direct current network electricity The monitoring and processing of pressure, the coordination to whole network voltage can be achieved, avoid any DC bus-bar voltage on direct current network from exceeding design Range of operation, this method is to maintaining whole direct current network voltage stabilization to have important directive significance.
(2) the method for the invention control algolithm is simple, and reliability is high, is adapted to engineer applied.
Brief description of the drawings
Fig. 1 is direct current network example topology figure；
Fig. 2 is DC voltage range of operation control strategy block diagram；
Fig. 3 is the control strategy block diagram for the current conversion station for determining DC voltage.
Embodiment
Below with reference to drawings and the specific embodiments, technical scheme is described in detail.
Fig. 1 is a kind of topological schematic diagram of direct current network, and the direct current network is made up of N number of current conversion station, forms " more mouthfuls of words Type " structure, and current conversion station S1~S (N-1) is set as the non-current conversion station for determining constant DP control, SN is fixed voltage-controlled current conversion station, And remember that the DC bus-bar voltages of S1, S2~SN current conversion stations is respectively Udcmean1、Udcmean2~UdcmeanN。
Fig. 2 is the block diagram of DC voltage range of operation control strategy.The control strategy can operate with straight illustrated by Fig. 1 Flow in power network topology, the voltage of dc bus where gathering each current conversion station of direct current network by upper strata communication apparatus first Udcmean1、Udcmean2~UdcmeanN, wherein N is the total number of current conversion station in direct current network；Here it is fixed to design n-th current conversion station DC voltage station and DC bus-bar voltage are UdcmeanN.Each non-change of current for determining DC voltage is calculated using voltage range control logic Stand and determine the pole busbar voltage deviation delta U between DC voltage current conversion stationdcmeank, specific calculation expression is as follows, wherein 1≤k ≤N-1：
ΔUdcmean1=UdcmeanN-Udcmean1
ΔUdcmean2=UdcmeanN-Udcmean2
……
ΔUdcmeank=UdcmeanN-Udcmeank
Take Δ UdcmeankIn maximum Δ Udcmean_maxAs the instruction drift correction value Δ determined DC voltage station and received Udcref。
Then the DC voltage setting value U for determining DC voltage station is provided by operations staffdcref, DC voltage setting value UdcrefIt is arranged to the whole network highest operating voltage.Calculate voltage instruction drift correction value Δ UdcrefWith DC voltage setting value Udcref Voltage deviation Δ U, wherein Δ U=Udcref-ΔUdcref.Voltage deviation Δ U progress proportional integrations are adjusted to obtain watt current Reference value Idref, and watt current reference value I is ensured by amplitude limit linkdrefIt is not out-of-limit, i.e.,：Idmin≤Idref≤Idmax。
Fig. 3 is the overall control strategy for determining DC voltage current conversion station, and control system uniformly gathers AC three-phase voltage UL, ABC、 AC three-phase electric current IL, ABC, AC electric voltage frequency f, direct current pole busbar voltage Udcmean, obtained according to AC electric voltage frequency f Voltage Reference phase thetaref.Control to have obtained watt current reference value I as the voltage range of determining described in Fig. 2dref, then by exchanging surely Voltage controls or Reactive Power Control obtains reactive current reference value Iqref.By watt current reference value Idref, reactive current reference Value IqrefWith system voltage reference phase θrefAs the input of Direct Current inner ring vector controlled, pass through above control method The control of DC voltage current conversion station is determined in completion.
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 (10)

1. a kind of direct current network voltage range control method, the direct current network refers to the multiterminal being made up of two or more current conversion station Current conversion station system, the current conversion station connect composition DC network each other by DC line；Characterized in that, the control method The current conversion station of constant DC voltage control is set in, the voltage of dc bus where each current conversion station of collection direct current network；According to each The DC bus-bar voltage and DC voltage setting value U of current conversion stationdcrefObtain DC voltage instruction drift correction value；According to direct current Pressure instruction drift correction value and DC voltage setting value UdcrefThe reference value at voltage station is determined in adjustment in real time, so that whole network voltage is being closed Within the scope of reason.
2. a kind of direct current network voltage range control method as claimed in claim 1, it is characterised in that this method specifically includes Following steps：
1) the voltage U of dc bus where gathering each current conversion station of direct current networkdcmean1、Udcmean2~UdcmeanN；Wherein N is direct current The total number of current conversion station in power network；For n-th current conversion station to determine DC voltage station, the station DC bus-bar voltage is UdcmeanN；
2) the AC three-phase voltage U at DC voltage station is determined in collectionL, ABC, AC three-phase electric current IL, ABC, AC electric voltage frequency f, and Voltage Reference phase theta is obtained according to AC electric voltage frequency fref；
3) DC voltage range of operation control algolithm is used, handles the DC bus-bar voltage U of each current conversion station collecteddcmean1、 Udcmean2~UdcmeanNWith DC voltage setting value Udcref, obtain DC voltage instruction drift correction value Δ Udcref；
4) DC voltage instruction drift correction value Δ U is handleddcrefAnd DC voltage setting value Udcref, obtain watt current reference Value Idref；
5) electrical quantity collected in 2) is obtained into reactive current reference value by alternating voltage control or Reactive Power Control Iqref；
6) by watt current reference value Idref, reactive current reference value IqrefWith system voltage reference phase θrefAs transverter Control signal exports to each transverter, the output watt current of each transverter and follows active current reference value IdrefIt is and idle Current following reactive current reference value Iqref。
3. a kind of direct current network voltage range control method as claimed in claim 1 or 2, it is characterised in that control system is led to Communication or the voltage by dc bus where each current conversion station of upper strata communication apparatus collection direct current network between missing the stop.
4. a kind of direct current network voltage range control method as claimed in claim 1 or 2, it is characterised in that determine DC voltage The DC voltage setting value U to standdcrefThere is provided by top level control equipment or other external device (ED)s, or set manually.
5. a kind of direct current network voltage range control method as claimed in claim 2, it is characterised in that employed in step 3) DC voltage range of operation control algolithm, calculate each non-current conversion station for determining DC voltage and determine the pole between DC voltage current conversion station Busbar voltage deviation delta Udcmeank, wherein 1≤k≤N-1, calculation expression are as follows：
ΔUdcmean1=UdcmeanN-Udcmean1
ΔUdcmean2=UdcmeanN-Udcmean2
……
ΔUdcmeank=UdcmeanN-Udcmeank
Take Δ UdcmeankIn maximum Δ Udcmean_maxAnd as DC voltage instruction drift correction value Δ Udcref。
6. a kind of direct current network voltage range control method as claimed in claim 1 or 2, it is characterised in that determine DC voltage The DC voltage setting value U to standdcrefChoose one of following setting value：
A) it is setting value to choose the whole network highest operating voltage；
B) it is setting value to choose the whole network minimum operation voltage；
C) setting value chosen is less than the whole network ceiling voltage limit value, and is higher than the whole network minimum voltage limit value.
A kind of 7. direct current network voltage range control method as claimed in claim 2, it is characterised in that the tool of the step 4) Gymnastics conduct：By voltage instruction drift correction value Δ UdcrefWith DC voltage setting value UdcrefDeviation delta U carry out proportional integration Regulation obtains watt current reference value Idref, and watt current reference value I is ensured by amplitude limit linkdrefIt is not out-of-limit, wherein：
Δ U=Udcref-ΔUdcref。
8. a kind of direct current network voltage range control method as claimed in claim 1 or 2, it is characterised in that the multiterminal change Station system is flowed, determines DC voltage station quantity for one, and the dc bus is positive electrode bus or negative electrode bus.
A kind of 9. direct current network voltage range control method as claimed in claim 7, it is characterised in that watt current reference value IdrefNot out-of-limit finger watt current reference value IdrefAllowing the watt current minimum value I of operationdminWith watt current maximum IdmaxBetween, i.e.,：
Idmin≤Idref≤Idmax。
10. a kind of direct current network voltage range control method as claimed in claim 2, it is characterised in that described in step 6) Any transverter uses Current Vector Control in each transverter.
CN201710822374.5A 2017-09-13 2017-09-13 Direct-current power grid voltage range control method Active CN107612013B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112350363A (en) * 2020-11-03 2021-02-09 南方电网科学研究院有限责任公司 Flexible direct current control method and related device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105071372A (en) * 2015-07-20 2015-11-18 清华大学 Voltage control method applied to flexible DC power distribution network
CN105552946A (en) * 2015-12-30 2016-05-04 国网辽宁省电力有限公司电力科学研究院 DC voltage control method of flexible ring network controller and control system thereof
CN106451572A (en) * 2016-10-18 2017-02-22 许继集团有限公司 AC/DC hybrid microgrid power balance control method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105071372A (en) * 2015-07-20 2015-11-18 清华大学 Voltage control method applied to flexible DC power distribution network
CN105552946A (en) * 2015-12-30 2016-05-04 国网辽宁省电力有限公司电力科学研究院 DC voltage control method of flexible ring network controller and control system thereof
CN106451572A (en) * 2016-10-18 2017-02-22 许继集团有限公司 AC/DC hybrid microgrid power balance control method

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
ASIMENIA KOROMPILI ET AL.: "Adaptive Droop-Based Voltage Control in Multi-Terminal dc Systems", 《2017 IEEE MANCHESTER POWERTECH》 *
王凯等: "五端直流电网电压控制及功率分配策略", 《电力建设》 *
董云龙等: "多端柔性直流控制保护系统架构和策略", 《南方能源建设》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112350363A (en) * 2020-11-03 2021-02-09 南方电网科学研究院有限责任公司 Flexible direct current control method and related device
CN112350363B (en) * 2020-11-03 2023-02-28 南方电网科学研究院有限责任公司 Flexible direct current control method and related device

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