CN108173277A - A kind of change Target Control Method of flexible direct current power transmission system - Google Patents

A kind of change Target Control Method of flexible direct current power transmission system Download PDF

Info

Publication number
CN108173277A
CN108173277A CN201810017472.6A CN201810017472A CN108173277A CN 108173277 A CN108173277 A CN 108173277A CN 201810017472 A CN201810017472 A CN 201810017472A CN 108173277 A CN108173277 A CN 108173277A
Authority
CN
China
Prior art keywords
control
change target
power transmission
target control
flexible direct
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201810017472.6A
Other languages
Chinese (zh)
Other versions
CN108173277B (en
Inventor
夏成军
刘志江
王真
华夏
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.)
South China University of Technology SCUT
Original Assignee
South China University of Technology SCUT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by South China University of Technology SCUT filed Critical South China University of Technology SCUT
Priority to CN201810017472.6A priority Critical patent/CN108173277B/en
Publication of CN108173277A publication Critical patent/CN108173277A/en
Application granted granted Critical
Publication of CN108173277B publication Critical patent/CN108173277B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/0006Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network for single frequency AC networks
    • H02J13/0013Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network for single frequency AC networks characterised by transmission structure between the control or monitoring unit and the controlled or monitored unit
    • H02J13/0017Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network for single frequency AC networks characterised by transmission structure between the control or monitoring unit and the controlled or monitored unit with direct transmission between the control or monitoring unit and the controlled or monitored unit
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18Arrangements for adjusting, eliminating or compensating reactive power in networks
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24Arrangements for preventing or reducing oscillations of power in networks
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H02J2003/365Reducing harmonics or oscillations in HVDC
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30Reactive power compensation
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/70Smart grids as climate change mitigation technology in the energy generation sector
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/22Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units

Abstract

The invention discloses a kind of change Target Control Method of flexible direct current power transmission system, the method is added to a new change target control link after transverter outer shroud controls and calculates desired value and actual value error link.The input control reference quantity of flexible direct current power transmission system transverter double -loop control is adjusted into line trace, the input control reference quantity of transverter double -loop control is divided into according to the accommodation limit of system by multiple progressive Small object values gradually, making system, non-overshoot rapidly reaches be divided into Small object value within the given time, so as to reach the desired value of input control reference quantity gradually, achieve the purpose that non-overshoot rapid track and control reference quantity.In addition increase after becoming target control, the PI link parameters of system double -loop control are more prone to adjust, and are adapted to the different working condition requirements of system.

Description

A kind of change Target Control Method of flexible direct current power transmission system
Technical field
The present invention relates to Power System Flexible technical field of direct current power transmission, and in particular to a kind of flexible direct current power transmission system Become Target Control Method.
Background technology
The application scenario of flexible DC power transmission determines that it needs good control performance, it is ensured that the stabilization of its control system Property and rapidity, ensure that the allotment of trend is flexibly and anti-dry under the premise of the voltage and power stability for ensureing DC transmission system Disturb ability.The control method of flexible direct current power transmission system is generally to dqShaft current, voltage are controlled, and control can be divided into interior Circular current controls and outer shroud control.Inner ring current control by adjusting transverter output voltage vd、vqCome to id、iqCarry out with Track controls.Outer shroud is controlled according to the required control model of system, such as is determined DC voltage, determined dc power, determine reactive power Control mode, the DC voltage obtained according to the actual operating state of system, active power, reactive power command value are calculated The i of inner ring current controld、iqControl reference value idrefAnd iqref.Outer shroud control is according to required active and idle reference Value and direct voltage reference value calculate the reference value of inner ring current control.Flexible direct current system is in normal operation, transverter It must have one end using constant DC voltage control, for the DC voltage of systems stabilisation, and coordinate and determine Reactive Power Control;Its He determines active power controller and determines Reactive Power Control current conversion station generally use.
In order to solve, the electric current dynamic response of flexible direct current transmission converter station control system is slow, control system is complicated, Shandong The problem of stick is not strong, it is entitled " defeated based on flexible direct current according to the double -loop control of traditional flexible DC transmission technology Electric system change of current station level modified control strategy ", Patent Application Publication No are that the Chinese invention patent of CN 105529731A carries Go out, in traditional control method, inner ring control mathematical model is simplified, is replaced with predictive control model, without Decouple link." the VSC-HVDC controllers based on three-level fuzzy adapted PI control are set clear et al. the scientific papers delivered of Zheng Lian Meter " (VSC-HVDC controller designs [J] the electric power of Zheng Lianqing, Chi Junfeng, Lu Zhiguo based on three-level fuzzy adapted PI control System protection and control, 2011,39 (23):The fuzzy adapted PI control side for VSC-HVDC is devised in 117-122.) Method, with an improved systems to move steady-state behaviour, reduces the overshoot in initial period, and switchs to PI controls in stable state to avoid steady Fuzzy control trembles shake phenomenon during state.What scientific paper " the VSC-HVDC controls based on flat system " delivered clear et al. greatly (VSC-HVDC control [J] electrotechnics journals of He great Qing, the Cai Xu based on flat system, 2012 (12):In 233-239.) The Double Loop Control System of VSC-HVDC is established using flat systems control theory, its main feature is that accurate mathematical model is not needed to, The adaptability of system is stronger, and improves the dynamic property of control system.
But traditional inner and outer ring control and the above-mentioned control method being improved according to the control of traditional inner and outer ring all do not have Overcome the contradiction of rapidity and overshoot, and its PI parameter is difficult to adjust, robustness without Guarantee control system well, Stability, rapidity.
Invention content
The purpose of the present invention is in view of the above shortcomings of the prior art, controlled in flexible direct current power transmission system control to solve It is complicated, be difficult to take into account rapidity and overshoot, the problem of control system robustness is not strong, provide a kind of flexible DC power transmission system The change Target Control Method of system.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of change Target Control Method of flexible direct current power transmission system, the method control input target in transverter outer shroud A new change target control link is added to after value.
Further, the function expression of the new change target control link into:
A=U0+V*(Aref-U0)
A is that addition becomes the desired value after target control link, U in formula0The initial value of controlled variable before starting in order to control, ArefFor final goal value, T is the regulating time set according to the system adjustment limit.
Further, the output of the new change target control link is real number, and changes over time, in the electrical of system When amount deviates the desired value of setting, at the time of starting to adjust to desired value, become target controller output valve and have to there are one non- Zero acceleration when reaching set adjustment time, becomes the pace of change of output valve of target link as zero, ensures to add in Change target link cannot influence final system and adjust reached value, simultaneously because the control for flexible direct current power transmission system For the change objective control function exponent number that device designs into three ranks, function meets its second dervative and three order derivatives in regulating time Integration is zero, ensures that function takes positive part and takes the area equation of negative part.
Further, the transverter outer shroud control includes constant DC voltage control, determines active power controller and determine idle Power control, wherein, the constant DC voltage control, determine active power controller cooperation dq axis coordinate systems under electric current idInner ring The electric current i under Reactive Power Control cooperation dq axis coordinate systems is determined in controlqInner ring controls.
Further, to detect the voltage of system at the beginning of new the changes target control link change target control Or power excursion desired value or desired value to the input of double -loop control carry out change target control, control when having carried out adjustment Time is calculated from this moment;The new regulating time for becoming the change target control of target control link is defeated according to flexible direct current The accommodation limit of electric system is set, and determines the change target control link of DC voltage outer shroud control design case for being directed to, during adjusting Between T need to be more than 3 times of flexible direct current power transmission system DC bus capacitor time constant or adjusted according to the situation of primary equipment It is whole;For being directed to the change target control link determined active power, determine reactive power outer shroud control design case, regulating time T is according to friendship Flow the rate setting of requirement and the allotment of transmission system trend of grid stability.
When direct current breaks down, after monitoring that DC Line Fault disappears, change target control is carried out to recovery process, makes system fast Quick-recovery realizes flexible direct current system fast recovery of power supply to desired value.
In DC voltage or active power, reactive power target value mutation, change target control is carried out to adjusting process, is made The DC voltage or active power of system, reactive power can reach desired value to quick non-overshoot.
Further, outer shroud control PI link proportionality coefficients matched with the new change target control link are set as The critical value K that flexible direct current power transmission system is caused to vibratepmax, Proportional coefficient KiSelection 0.01, finally can be according to the requirement of system It is finely adjusted.
Further, the method is suitable for all flexible DC power transmission engineerings, is used not only for two traditional electricity Flat, three level VSC-HVDC, additionally it is possible to for modular multilevel MMC-HVDC, and be applicable not only to the flexible direct current at both ends Transmission system also can be used in the control of Multi-end flexible direct current transmission system.
Compared with prior art, the present invention having the following advantages that and advantageous effect:
The method of the invention realize the quick and non-overshoot of flexible direct current power transmission system converter Control desired value with Track is adjusted, and the PI link parameters of transverter double -loop control is caused to be easier to adjust, and enhances the robustness of control system;It is logical The new change target control link of addition is crossed, the desired value of input is divided into several Small objects, system is made gradually to reach gradually Final control targe, and the cooperation of the PI link parameters controlled by inner and outer ring reach set with making the quick non-overshoot of system Fixed desired value.
Description of the drawings
Fig. 1 is flexible direct current power transmission system outer shroud control strategy control block diagram.
Fig. 2 is flexible direct current power transmission system current inner loop control policy control block diagram.
Fig. 3 is flexible direct current power transmission system current inner loop control strategy simplify control block diagram.
Fig. 4 is the change target control strategy schematic diagram of flexible direct current power transmission system.
Fig. 5 is three-terminal flexible direct-current power transmission system topology diagram.
Fig. 6 is modular multi-level converter topological structure figure.
Fig. 7 (a) is the bicyclic control of recovery process addition change Target Control Method after three-terminal flexible direct-current power transmission system failure System strategy and classical 1 DC side active power comparison diagram of Double-loop Control Strategy current conversion station, Fig. 7 (b) is three-terminal flexible direct-current power transmission Recovery process adds in the Double-loop Control Strategy for becoming Target Control Method after the system failure and classical Double-loop Control Strategy current conversion station 2 is straight Side active power comparison diagram is flowed, Fig. 7 (c) is recovery process addition change target control side after three-terminal flexible direct-current power transmission system failure The Double-loop Control Strategy of method and classical 3 DC side active power comparison diagram of Double-loop Control Strategy current conversion station, Fig. 7 (d) are soft for three ends Property DC transmission system failure after recovery process add in the Double-loop Control Strategy for becoming Target Control Method and classical double -loop control plan The slightly DC voltage comparison diagram of system.
Fig. 8 (a) be add in become target control link after three-terminal flexible direct-current power transmission system in the different PI of identical target The DC voltage schematic diagram of system under parameter, Fig. 8 (b) exist for three-terminal flexible direct-current power transmission system after adding in change target control link 1 DC side active power schematic diagram of current conversion station under the different PI parameters of identical target, Fig. 8 (c) become target control ring to add in Three-terminal flexible direct-current power transmission system 2 DC side active power of current conversion station under the different PI parameters of identical target is illustrated after section Figure, Fig. 8 (d) be add in change target control link after three-terminal flexible direct-current power transmission system under the different PI parameters of identical target 3 DC side active power schematic diagram of current conversion station.
Specific embodiment
With reference to embodiment and attached drawing, the present invention is described in further detail, but embodiments of the present invention are unlimited In this.
Embodiment:
Fig. 1 is the structure of the outer shroud control of the control strategy of flexible direct current transmission converter station, and active class outer shroud control includes Determine active power controller and constant DC voltage control, idle class control is determines Reactive Power Control.As shown in Figure 1, outside active class That ring control calculates is idReference value, that the control of idle class outer shroud calculates is iqReference value, and active class and idle class Outer shroud controls the control of each current conversion station to need to select a kind of to realize control.
Fig. 2 is the control block diagram of inner ring current control.When inner ring current control makes i using PI controlsd、iqTrack reference value When, the relational expression of interior ring controller input quantity can be obtained:
vd=ud+ωL0iq-[kpd(idref-id)+kid∫(idref-id)dt] (1)
vq=uq-ωL0id-[kpq(iqref-iq)+kiq∫(iqref-iq)dt] (2)
It is instruction references value to be wherein designated as ref down, two Front Feed Compensations for inner ring control before formula, previous Xiang Wei electricity The compensation of net voltage disturbance signal, latter are the compensation rate of dq shaft currents component coupling, and Section 3 is the negative of PI controlling units Feedback regulation.KpExpression is the coefficient of the proportional component of PI links, KiWhat is represented is the coefficient of integral element.
Since preceding two Front Feed Compensations of formula (1), formula (2) can be cancelled in inner ring control, so in comprehensive Circular current controls and VSC mathematical models, it can be deduced that the inner ring current control after abbreviation, such as Fig. 3.
In order to solve the contradiction of traditional double -loop control rapidity and overshoot, after transverter outer shroud controls input desired value A new change target control link is added to, unlimited number of small desired value is divided into the desired value of input, makes system gradually Reach final target, i.e., shown in Fig. 4, to become target control link in dotted line frame in figure, value changes over time.In the institute of system The parameter of this link in the attainable limit is rationally set, can both meet system rapidity, and also without overshoot, and ensure The robustness and adaptability of control system.
It is exactly to start between final goal state in controlled volume to become target control, according to the ability to bear of system, initially The difference of value and desired value is divided into unlimited number of Small object, and segmentation reaches final desired value, realizes and final reaches target The design work of non-overshoot during value.
The design principle of this link:1) output of new change target control link is real number, and changes over time, in system Electrical quantity deviate setting desired value when, at the time of starting to adjust to desired value, become target controller output valve must have The acceleration of one non-zero.2) when reaching set adjustment time, become the pace of change of target link output valve as zero, protect The change target link that card adds in cannot influence final system and adjust reached value.3) since the VSC-HVDC systems after simplification are Third-order system, so it is zero that the second dervative of designed proportional component expression formula is integrated with three order derivatives in entire section, Ensure to take the area of positive part and take the area equation of negative part.
Be at the beginning of becoming target control the system that detects voltage or power excursion desired value or desired value into It has gone adjustment, when control system needs to be adjusted, just the input of double -loop control has been carried out to become desired value control, control time It is calculated from this moment.The regulating time of design is according to the situation and actual value of equipment and the difference of desired value, rule of thumb Value is becoming the corresponding value of target control link setting.
The function of newly-increased change target link is devised according to mentioned above principle, function expression is:
A=U0+V*(Aref-U0)
A is that addition becomes the desired value after target control link, U in formula0The initial value of controlled variable before starting in order to control, ArefFor final goal value, T is the regulating time set according to the system adjustment limit.
Wherein, the regulating time T of the change target control link is set according to flexible direct current power transmission system accommodation limit It puts.The change target control link of DC voltage outer shroud control design case is determined for being directed to, regulating time T need to be more than flexible DC power transmission Time constant or system the control requirement that 3 times of system dc lateral capacitance are adjusted.For determining active power, fixed idle work( The change target control link of rate outer shroud control design case, requirements and transmission system of the regulating time T according to AC network stability The rate setting of trend allotment.
The wherein cooperation of PI links parameter becomes the PI link parameter coordinations that Target Control Method needs outer shroud to control, with change The matched outer shroud control PI link proportionality coefficients of target control are set as the critical value that flexible direct current power transmission system is caused to vibrate KpmaxIt is proper, and Proportional coefficient Ki0.01 is typically chosen, is finally finely adjusted according to the requirement of system.
Below by the validity of the change Target Control Method of simulating, verifying flexible direct current power transmission system.
On PSCAD/EMTDC emulation platforms, according to the three-terminal flexible direct-current power transmission mould of Cigre standard test models transformation Type carries out simulating, verifying, and Fig. 5 is for the three-terminal flexible direct-current power transmission of control method validity designed by the emulation testing present invention System structure, Fig. 6 are the topological structure of current conversion station in Fig. 5, and current conversion station is formed using modularization multi-level converter.Each current conversion station Pre-set parameter such as table 1:
Table 1
Emulation one:Three-terminal flexible direct-current power transmission system uses master & slave control, and current conversion station 1 is used as main control station, using surely straight Galvanic electricity is voltage-controlled to be made and determines Reactive Power Control.Current conversion station 2,3 is as from control station, using determining DC side active power controller and fixed Reactive Power Control.Current conversion station 2 is used as spare master station, and when 1 failure of current conversion station is stopped transport, top level control system is automatically master control Station is released to current conversion station 2, and 2 control mode of current conversion station becomes constant DC voltage control and determines Reactive Power Control.
Fig. 7 is the double -loop control plan of recovery process addition change Target Control Method after three-terminal flexible direct-current power transmission system failure Slightly compared with the control effect of classical Double-loop Control Strategy.Wherein TDPI curves are to add in the double -loop control for becoming Target Control Method The controlling curve of strategy, PI curves are using classical Double-loop Control Strategy curve.It is handed over during setting 5.05 seconds of system operation Flow side three phase short circuit fault, continue 0.1 second, after a failure 0.05 second when, AC circuit breaker start, cut off short trouble, the change of current 1 implementation emergency outage of standing operates, and top level control device makes the control of current conversion station 2 be switched to constant DC voltage control.In the change of current Stand 2 constant DC voltage control add in arrange transient process proportional component.The wherein PI parameters of transition process arranging parameter It adjusts as K1=2000, T1=0.01, inner ring control PI links parameter tuning is K2=1, T2=0.01.Classical outer shroud control PI links parameter tuning is K1=20, T1=0.01, inner ring control PI links parameter tuning is K2=1, T2=0.01.Become target The regulating time T=0.1s of control.
After short trouble is cut off, for stable DC voltage, current conversion station 2 needs to meet that current conversion station 3 conveyed originally has Work(power, the double -loop control that the double -loop control and addition that classical PI links are formed become target control can make system by certain Time reach the stable state after failure.But it can be seen that under using Target Control Method is become from the simulation result of Fig. 7, fast There is no contradictions between speed and overshoot, and the regulating power of system reaches maximum and unsaturated, without result in overshoot.Fig. 7 (a) For 1 DC side active power of current conversion station.Fig. 7 (b) is 2 DC side active power of current conversion station, and Fig. 7 (c) has for 3 DC side of current conversion station Work(power.It can be seen that contracting of the time that 2 active power of current conversion station rises after setting change target control than classical double -loop control control It is short by 33.3%, and the active power rise time that regulating time shortens current conversion station 3 also shortens 33.7%, but overshoot does not almost have Have.Fig. 7 (d) is the DC voltage of system, uses the voltage overshoot of inner and outer ring control of classical PI links as 3.8%, and The voltage overshoot of inner and outer ring control that setting becomes after target control is almost 0.
Emulation two:1pu is promoted in three-terminal flexible direct-current power transmission system simulation active power step instruction, observes each current conversion station Active power situation of change and DC voltage step response characteristic.At 5.1 seconds, 2 active power of current conversion station received step Instruction promotes 1pu.Current conversion station 2, which uses, determines active power controller strategy, and add change Target Control Method.It sets different The PI link parameters of inner and outer ring control system observe the control effect of control parameter different under same target, access control system The robustness of system.Simulation curve table 2 corresponding with control parameter:
Table 2
Fig. 8 be add in become target control link after three-terminal flexible direct-current power transmission system in the different PI parameters of identical target Under control effect.Fig. 8 (a) is the DC voltage of system.Fig. 8 (b) is 1 DC side active power of current conversion station.Fig. 8 (c) is changes 2 DC side active power of stream station.Fig. 8 (d) is 3 DC side active power of current conversion station.It understands to add in the flexibility after becoming target control DC transmission system double -loop control, in the case where changing double -loop control proportional component parameter, better according to the desired value arranged properly Reach successively, thus illustrate effectively reduce sensibility of the system to control parameter, enhancing control after adding in change target control The robustness of system.
The above, patent preferred embodiment only of the present invention, but the protection domain of patent of the present invention is not limited to This, any one skilled in the art is in the range disclosed in patent of the present invention, according to the skill of patent of the present invention Art scheme and its patent of invention design are subject to equivalent substitution or change, belong to the protection domain of patent of the present invention.

Claims (7)

1. a kind of change Target Control Method of flexible direct current power transmission system, it is characterised in that:The method is in transverter outer shroud control A new change target control link is added to after system input desired value.
2. the change Target Control Method of a kind of flexible direct current power transmission system according to claim 1, which is characterized in that described The function expression of new change target control link into:
A=U0+V*(Aref-U0)
A is that addition becomes the desired value after target control link, U in formula0The initial value of controlled variable, A before starting in order to controlrefFor most Whole desired value, T are the regulating time set according to the system adjustment limit.
3. a kind of change Target Control Method of flexible direct current power transmission system according to claim 2, it is characterised in that:It is described The output of new change target control link is changed over time into real number, when the electrical quantity of system deviates the desired value of setting, At the time of starting to adjust to desired value, change target controller output valve has to the acceleration there are one non-zero, when set by arrival During fixed adjustment time, become the pace of change of output valve of target link as zero, the change target link for ensureing to add in cannot influence Final system adjusts reached value, simultaneously because the change target control obtained for the controller design of flexible direct current power transmission system Function exponent number processed is three ranks, and it is zero that function, which meets its second dervative to integrate in regulating time with three order derivatives, ensures that function takes Positive part and the area equation for taking negative part.
4. a kind of change Target Control Method of flexible direct current power transmission system according to claim 1, it is characterised in that:It is described The control of transverter outer shroud includes constant DC voltage control, determines active power controller and determines Reactive Power Control, wherein, described determines DC voltage control, determine active power controller cooperation dq axis coordinate systems under electric current idInner ring controls, and determines Reactive Power Control and matches Close the electric current i under dq axis coordinate systemsqInner ring controls.
5. a kind of change Target Control Method of flexible direct current power transmission system according to claim 1, it is characterised in that:It is described At the beginning of new changes target control link change target control into detect system voltage or power excursion desired value or When person's desired value has carried out adjustment, change target control is carried out to the input of double -loop control, control time is calculated from this moment; The regulating time that the new change target control link becomes target control is set according to the accommodation limit of flexible direct current power transmission system It puts, the change target control link of DC voltage outer shroud control design case is determined for being directed to, regulating time T need to be more than flexible DC power transmission The time constant or be adjusted according to the situation of primary equipment that 3 times of system dc lateral capacitance;Determine wattful power for being directed to Rate, the change target control link for determining reactive power outer shroud control design case, regulating time T according to the requirement of AC network stability with And the rate setting of transmission system trend allotment.
6. a kind of change Target Control Method of flexible direct current power transmission system according to claim 1, it is characterised in that:With institute The matched outer shroud control PI link proportionality coefficients of new change target control link are stated to be set as leading to flexible direct current power transmission system The critical value K of oscillationpmax, Proportional coefficient KiSelection 0.01, can finally be finely adjusted according to the requirement of system.
7. a kind of change Target Control Method of flexible direct current power transmission system according to claim 1, it is characterised in that:It is described Method is suitable for all flexible DC power transmission engineerings, is used not only for the VSC-HVDC of two traditional level, three level, also It can be used in modular multilevel MMC-HVDC, and be applicable not only to the flexible direct current power transmission system at both ends, also can be used in more Hold the control of flexible direct current power transmission system.
CN201810017472.6A 2018-01-09 2018-01-09 A kind of change Target Control Method of flexible HVDC transmission system Active CN108173277B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810017472.6A CN108173277B (en) 2018-01-09 2018-01-09 A kind of change Target Control Method of flexible HVDC transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810017472.6A CN108173277B (en) 2018-01-09 2018-01-09 A kind of change Target Control Method of flexible HVDC transmission system

Publications (2)

Publication Number Publication Date
CN108173277A true CN108173277A (en) 2018-06-15
CN108173277B CN108173277B (en) 2019-10-18

Family

ID=62517763

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810017472.6A Active CN108173277B (en) 2018-01-09 2018-01-09 A kind of change Target Control Method of flexible HVDC transmission system

Country Status (1)

Country Link
CN (1) CN108173277B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110148953A (en) * 2019-05-30 2019-08-20 国家电网有限公司 A kind of additional wind-powered electricity generation undulated control method suitable for flexible direct current high speed loop
CN112086988A (en) * 2020-08-26 2020-12-15 东南大学 Smooth switching method for control strategy of voltage source type converter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103178539A (en) * 2013-03-21 2013-06-26 浙江省电力公司电力科学研究院 Direct current voltage deviation slope control method for multi-end flexible direct current power transmission system
CN103414179A (en) * 2013-06-04 2013-11-27 南方电网科学研究院有限责任公司 Droop control method suitable for multi-terminal flexible direct current transmission system
CN104333032A (en) * 2014-11-20 2015-02-04 北京荣信慧科科技有限公司 Circulation control strategy for reducing current peak of flexible HVDC (High Voltage Direct Current Transmission) converter valve
CN104659802A (en) * 2015-03-11 2015-05-27 云南电网有限责任公司电网规划研究中心 Coordination control method of VSC-HVDC (voltage source converter based high voltage direct current) alternating-current voltage-frequency for improving transient stability of alternating-current system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103178539A (en) * 2013-03-21 2013-06-26 浙江省电力公司电力科学研究院 Direct current voltage deviation slope control method for multi-end flexible direct current power transmission system
CN103414179A (en) * 2013-06-04 2013-11-27 南方电网科学研究院有限责任公司 Droop control method suitable for multi-terminal flexible direct current transmission system
CN104333032A (en) * 2014-11-20 2015-02-04 北京荣信慧科科技有限公司 Circulation control strategy for reducing current peak of flexible HVDC (High Voltage Direct Current Transmission) converter valve
CN104659802A (en) * 2015-03-11 2015-05-27 云南电网有限责任公司电网规划研究中心 Coordination control method of VSC-HVDC (voltage source converter based high voltage direct current) alternating-current voltage-frequency for improving transient stability of alternating-current system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
黄焕袍等: "安排过渡过程是提高闭环系统"鲁棒性、适应性和稳定性"的一种有效方法", 《控制理论与应用》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110148953A (en) * 2019-05-30 2019-08-20 国家电网有限公司 A kind of additional wind-powered electricity generation undulated control method suitable for flexible direct current high speed loop
CN112086988A (en) * 2020-08-26 2020-12-15 东南大学 Smooth switching method for control strategy of voltage source type converter

Also Published As

Publication number Publication date
CN108173277B (en) 2019-10-18

Similar Documents

Publication Publication Date Title
CN104659805B (en) Method for operating a wind farm
CN105244902B (en) The DC voltage slop control method and system of Multi-end flexible direct current transmission system
Tambey et al. Damping of power system oscillations with unified power flow controller (UPFC)
CN108173277B (en) A kind of change Target Control Method of flexible HVDC transmission system
CN106849106B (en) DC distribution net system voltage flexible control method
KR101967127B1 (en) DC power network voltage control method
CN105515012B (en) A kind of energy storage participates in learning algorithms method and device
CN108539798B (en) Secondary regulation strategy of energy storage system based on model predictive control
Papangelis et al. Coordinated supervisory control of multi-terminal HVDC grids: A model predictive control approach
CN105244901B (en) A kind of nonlinear decentralized control method of HVDC transmission system
CN107516888B (en) Multi-terminal flexible direct current system droop control method containing direct current voltage secondary regulation
CN105140948A (en) Flexible direct current transmission system power coordination control method
CN106451515A (en) Generalized sagging control method suitable for multi-terminal flexible direct current power transmission system
CN105958515A (en) Fixed time dynamic surface high-order sliding-mode suppression method for chaotic oscillation of power system
CN108075491A (en) The power quality treatment method of APF, SVC combination based on micro-grid energy storage system
CN105634305B (en) A kind of closed loop control method of quantitative control IGBT average frequency of switching suitable for high level modularization multi-level converter
CN105024390B (en) Micro-grid battery energy storage system frequency modulation control method based on BP neural network
CN104917170A (en) Method for adjusting voltage and frequency through micro power grid self-adaption droop control based on PI control
CN111668865B (en) Hierarchical control method and related device for echelon utilization energy storage system
CN110350571A (en) A kind of control method promoting flexible DC transmission exchange side fault ride-through capacity
CN106329537B (en) A kind of idle work optimization method adapting to bulk power grid automatism voltage control
CN106786645B (en) Dynamic reactive compensation device cooperative control method and system
CN103855716A (en) Intelligent FLC-PID mixed STATCOM control method
CN107732892A (en) A kind of optimal suppressing method of overvoltage based on the idle control of D.C. high voltage transmission
CN106941258A (en) A kind of power factor control method and device applied to transverter

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant