CN105826941A - Method for controlling black-start receiving end in high-voltage direct current transmission - Google Patents
Method for controlling black-start receiving end in high-voltage direct current transmission Download PDFInfo
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- CN105826941A CN105826941A CN201610282025.4A CN201610282025A CN105826941A CN 105826941 A CN105826941 A CN 105826941A CN 201610282025 A CN201610282025 A CN 201610282025A CN 105826941 A CN105826941 A CN 105826941A
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- additional frequency
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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 invention discloses a method for controlling black-start a receiving end in high-voltage direct current transmission (HVDC). The method comprises the following steps: a HVDC rectifier side controlling the adding of a constant DC voltage control mode; a HVDC inverter side controlling a constant current control mode based on an original inverter side, with an original constant extinction angle as a limiter, in combination with the newly added constant direct current voltage control mode on the rectifier side, realizing control modes of the rectifier side constant voltage and inverter side constant current of the direct current system; based on the original control mode of the inverter side constant current, adding an additional frequency controller; designing the additional frequency controller and configuring the additional frequency controller through a pole configuration method so as to allow the additional frequency controller to provide positive damping to the system, the additional frequency controller being designed to first-order lead lag link. According to the invention, the method sets a power modulation end to the inverter side, adds the additional frequency controller on the inverter side, realizes the local additional frequency controlling strategy upon the black-start, and increases system stability.
Description
Technical field
The present invention relates to D.C. high voltage transmission black starting-up field, particularly to a kind of control method for D.C. high voltage transmission receiving end black starting-up.
Background technology
After black starting-up refers to that whole system is stopped transport because of fault, do not rely on the help of other networks, by system has the unit of self-startup ability unit drive non self starting, and gradually expand the scope of system recovery, finally realize the recovery of whole system.Traditional power grid"black-start" mode, typically utilizes this area to have the fuel oil consump-tion of self-startup ability, Hydropower Unit as black starting-up power supply, progressively starts other large-scale conventional power generation usage unit.Use ac transmission mode to drive power system restoration, have that toggle speed is slow, subsidiary engine starts the problems such as impact is big, affect the speed that load restoration during black starting-up is powered.
Direct current transportation has the advantages such as conveying power is big, start and speed governing is fast, controllability is strong, and these features can play bigger effect at the black starting-up initial stage.Particularly utilize HVDC supplementary control strategy can AC system frequency, meritorious etc. be modulated during black starting-up, improve receiving-end system stability.Traditional DC additional controller is typically installed at DC rectifier side, utilizes rectification side Given current controller pattern to improve system stability, and choosing the existing local signal of control signal also has far-end wide area signal.But during receiving end power grid"black-start", utilize rectification side to be modulated inevitably facing the communication issue such as signal lag and packet loss to receiving end active power, be unfavorable for the fast quick-recovery of receiving end electrical network.Therefore, how to utilize the additional modulation function of direct current transportation during receiving end power grid"black-start", giving full play to customary DC transmission of electricity becomes problem demanding prompt solution in the advantage of the aspect such as transmission capacity, governing speed.
Summary of the invention
The problem that connects to be solved by this invention is to provide a kind of control method for D.C. high voltage transmission receiving end black starting-up, original hvdc control mode increases rectification side and determines voltage, inverter side Given current controller pattern, algorithm for power modulation end is set in inverter side, and increasing additional frequency controller in inverter side so that black starting-up speed is fast, system recovery is stable.
For solving above-mentioned technical problem, the technical solution used in the present invention is:
A kind of control method for D.C. high voltage transmission receiving end black starting-up, comprises the following steps:
Step 1, D.C. high voltage transmission rectification side control increase constant DC voltage control pattern, the most described constant DC voltage control pattern uses PI controller, to measure the voltage difference with reference voltage as input, using Trigger Angle as output, output Trigger Angle compares with the Trigger Angle output of original rectification side Given current controller, takes higher value as output；
Step 2, D.C. high voltage transmission inverter side control based on original Given current controller pattern, blow-out angle mould formula is determined as limiter using original, i.e. constant DC current control pattern uses PI controller, to measure the electric current difference with reference current as input, using Trigger Angle as output, output Trigger Angle exports with the Trigger Angle determining gamma kick and compares, and takes higher value as output；Described inverter side Given current controller pattern combines rectification side increase constant DC voltage control pattern thus forms rectification side and determine voltage inverter side Given current controller pattern；
Step 3, increase additional frequency controller, described additional frequency controls, using the difference of inverter side change of current bus frequency measurement and 50Hz fundamental frequency as input, as output and to be superimposed to original Given current controller loop using electric current controlled quentity controlled variable；
Step 4, additional frequency controller is designed, use least square-invariable rotary identification technique that system performance is carried out identification, draw system zero pole distribution situation, system zero limit is configured again by pole-assignment, promote system damping, form additional frequency controller so that it provides positive damping to system.
According to such scheme, described additional frequency controller is set to single order or second order lead-lag link, and wherein, single order additional frequency controller isWherein K is additional frequency controller transfer function, and s is complex frequency domain variable.
Compared with prior art, the invention has the beneficial effects as follows: utilize the fast modulation function of direct current transportation to improve the stability of receiving end electrical network, provide a kind of new technique with important practical value for having the fast quick-recovery of electrical network after direct current drop point electrical network realizes massive blackout.Locally-attached FREQUENCY CONTROL can not only greatly improve receiving-end system frequency fluctuation phenomenon, and avoids telecommunication, improves the reliability of control strategy.The present invention is applicable to the dc power of black starting-up process and promotes, and also can provide technical guarantee to the algorithm for power modulation of D.C. high voltage transmission under weak receiving end AC system, have important promotional value.
Accompanying drawing explanation
Fig. 1 is the phantom structural representation used in instantiation of the present invention.
Fig. 2 is rectification side control model schematic diagram in the present invention.
Fig. 3 is that rectification side of the present invention determines voltage, inverter side determines DC operation characteristic schematic diagram during electric current.
Fig. 4 is that in the present invention, inverter side additional frequency controls schematic diagram.
Fig. 5 be in the present invention inverter side additional frequency control before and after system frequency comparison diagram.
Fig. 6 is that in the present invention, before and after the control of inverter side additional frequency, system dc sends active power comparison diagram outside.
Fig. 7 be in the present invention inverter side additional frequency control before and after DC consumption reactive power comparison diagram.
Fig. 8 be in the present invention inverter side additional frequency control before and after system voltage comparison diagram.
Detailed description of the invention
With detailed description of the invention, invention is described in further detail below in conjunction with the accompanying drawings, a kind of control method for D.C. high voltage transmission receiving end black starting-up that the present invention provides, comprises the following steps:
Step 1, D.C. high voltage transmission rectification side control increase constant DC voltage control pattern, the most described constant DC voltage control pattern uses PI controller, to measure the voltage difference with reference voltage as input, using Trigger Angle as output, output Trigger Angle compares with the Trigger Angle output of original rectification side Given current controller, takes higher value as output.
Step 2, D.C. high voltage transmission inverter side control based on original Given current controller pattern, blow-out angle mould formula is determined as limiter using original, i.e. constant DC current control pattern uses PI controller, to measure the electric current difference with reference current as input, using Trigger Angle as output, output Trigger Angle exports with the Trigger Angle determining gamma kick and compares, and takes higher value as output；Described inverter side Given current controller pattern combines rectification side increase constant DC voltage control pattern thus forms rectification side and determine voltage inverter side Given current controller pattern.
Step 3, increase additional frequency controller, described additional frequency controls, using the difference of inverter side change of current bus frequency measurement and 50Hz fundamental frequency as input, as output and to be superimposed to original Given current controller loop using electric current controlled quentity controlled variable.
Step 4, additional frequency controller is designed, use least square-invariable rotary identification technique that system performance is carried out identification, draw system zero pole distribution situation, system zero limit is configured again by pole-assignment, promote system damping, form additional frequency controller so that it provides positive damping to system.
Concrete, described additional frequency controller is set to first-order lead delay component, and additional frequency controller isWherein K is additional frequency controller transfer function, and s is complex frequency domain variable.
Below by instantiation application, the present invention will be described.As it is shown in figure 1, phantom is mainly by sending end equivalence machine, dragon political affairs direct current, receiving end Yixing pump-storage generator, preferably assist unit and load structure.In black starting-up system, sending end equivalence machine is the 500kV equivalence power supply of 6125MVA capacity of short circuit；Dragon political affairs direct current is bipolar 12 pulse waves, ± 500kV rated voltage, 3kA rated current, 3000MW rated power；Yixing pump-storage generator is constituted by comprising the excitation 4 250MW units with governing system；Preferably assist unit to be made up of the fired power generating unit of 3 170MW, the most preferably assist station service to utilize asynchronous motor to simulate.
D.C. high voltage transmission rectification side controls to increase constant DC voltage control pattern, as shown in Figure 2.D.C. high voltage transmission inverter side controls based on original inverter side Given current controller pattern, and to determine blow-out angle mould formula as limiter, thus realizes that straight-flow system rectification side determines voltage, inverter side determines the control model of electric current；Now direct current VI operation characteristic is as shown in Figure 3.Utilizing inverter side constant current mode to increase additional frequency controller, as shown in Figure 4, wherein input signal uses inverter side change of current bus difference on the frequency to control to realize this locality.
System operation conditions is set as that receiving end Yixing pumped storage system drives a machine, band 200MW burden with power and 50MW load or burden without work, within 1.5th second, AC circuit breaker closes a floodgate, 3rd second direct current, direct current sets up power after within the 0.5th second, unlocking, 3s direct current is with 70% blood pressure lowering, 5% minimum current pattern unlocks, after within 3.7th second, dc power is set up, put into one group of 200Mvar capacity wave filter, put into 50Mvar reactor stabilize voltage pulsation and put into the suppression frequency fluctuation of additional frequency controller simultaneously, within 25th second, input preferably assists station service, within 30th second, again increase load, until 130 seconds stop emulation.System frequency, direct current are sent meritorious, electromotor outside and are sent idle and system voltage outside respectively as shown in Fig. 5, Fig. 6, Fig. 7 and Fig. 8.
From simulation result, after inverter side additional frequency controls to put into, system frequency stability is largely increased, dc power is modulated with system requirements simultaneously, demonstrate locally-attached FREQUENCY CONTROL strategy validity, on the other hand, due to the lifting of system frequency stability, system overvoltage and voltage stability are improved the most accordingly, demonstrate this strategy validity.
Claims (2)
1. the control method for D.C. high voltage transmission receiving end black starting-up, it is characterised in that comprise the following steps:
Step 1, D.C. high voltage transmission rectification side control increase constant DC voltage control pattern, the most described constant DC voltage control pattern uses PI controller, to measure the voltage difference with reference voltage as input, using Trigger Angle as output, output Trigger Angle compares with the Trigger Angle output of original rectification side Given current controller, takes higher value as output；
Step 2, D.C. high voltage transmission inverter side control based on original Given current controller pattern, blow-out angle mould formula is determined as limiter using original, i.e. constant DC current control pattern uses PI controller, to measure the electric current difference with reference current as input, using Trigger Angle as output, output Trigger Angle exports with the Trigger Angle determining gamma kick and compares, and takes higher value as output；Described inverter side Given current controller pattern combines rectification side increase constant DC voltage control pattern thus forms rectification side and determine voltage inverter side Given current controller pattern；
Step 3, increase additional frequency controller, described additional frequency controls, using the difference of inverter side change of current bus frequency measurement and 50Hz fundamental frequency as input, as output and to be superimposed to original Given current controller loop using electric current controlled quentity controlled variable；
Step 4, additional frequency controller is designed, use least square-invariable rotary identification technique that system performance is carried out identification, draw system zero pole distribution situation, system zero limit is configured again by pole-assignment, promote system damping, form additional frequency controller so that it provides positive damping to system.
2. kind as claimed in claim 1 is for the control method of D.C. high voltage transmission receiving end black starting-up, it is characterised in that described additional frequency controller is set to first-order lead delay component, and additional frequency controller isWherein K is additional frequency controller transfer function, and s is complex frequency domain variable.
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| CN201610282025.4A CN105826941B (en) | 2016-04-29 | 2016-04-29 | A kind of control method for D.C. high voltage transmission receiving end black starting-up |
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| CN201610282025.4A CN105826941B (en) | 2016-04-29 | 2016-04-29 | A kind of control method for D.C. high voltage transmission receiving end black starting-up |
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| CN105826941B CN105826941B (en) | 2018-06-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108388235A (en) * | 2018-04-10 | 2018-08-10 | 南京南瑞继保电气有限公司 | A kind of test method of high pressure/extra-high voltage direct-current control system dynamic property |
| CN110365048A (en) * | 2019-07-19 | 2019-10-22 | 昆明理工大学 | A kind of black starting-up rack dynamic stability appraisal procedure based on optimization trend |
Citations (2)
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| JPH10248300A (en) * | 1997-03-07 | 1998-09-14 | Toshiba Corp | Power converter |
| CN102035214A (en) * | 2010-12-15 | 2011-04-27 | 山东大学 | System operating mode selecting method in process of restoring direct current support weak receiving system |
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2016
- 2016-04-29 CN CN201610282025.4A patent/CN105826941B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10248300A (en) * | 1997-03-07 | 1998-09-14 | Toshiba Corp | Power converter |
| CN102035214A (en) * | 2010-12-15 | 2011-04-27 | 山东大学 | System operating mode selecting method in process of restoring direct current support weak receiving system |
Non-Patent Citations (1)
| Title |
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| 李林等: "无站间通信下的高压直流输电系统逆变侧频率控制方法", 《电力系统自动化》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108388235A (en) * | 2018-04-10 | 2018-08-10 | 南京南瑞继保电气有限公司 | A kind of test method of high pressure/extra-high voltage direct-current control system dynamic property |
| CN110365048A (en) * | 2019-07-19 | 2019-10-22 | 昆明理工大学 | A kind of black starting-up rack dynamic stability appraisal procedure based on optimization trend |
| CN110365048B (en) * | 2019-07-19 | 2022-11-29 | 昆明理工大学 | Black-start net rack dynamic stability assessment method based on optimized trend |
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