CN107732952A - The failure response analysis method and system of multiterminal Hybrid HVDC system - Google Patents

The failure response analysis method and system of multiterminal Hybrid HVDC system Download PDF

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CN107732952A
CN107732952A CN201710960220.2A CN201710960220A CN107732952A CN 107732952 A CN107732952 A CN 107732952A CN 201710960220 A CN201710960220 A CN 201710960220A CN 107732952 A CN107732952 A CN 107732952A
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current conversion
conversion station
hybrid hvdc
hvdc system
control
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杨健
洪潮
张野
李俊杰
孙鹏伟
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CSG Electric Power Research Institute
Power Grid Technology Research Center of China Southern Power Grid Co Ltd
Research Institute of Southern Power Grid Co Ltd
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Power Grid Technology Research Center of China Southern Power Grid Co Ltd
Research Institute of Southern Power Grid Co Ltd
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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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
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    • G06Q50/06—Energy or water supply
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
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    • 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]
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS 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
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications

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Abstract

The present invention discloses the failure response analysis method and system of a kind of multiterminal Hybrid HVDC system, is related to technical field of direct current power transmission, for research and analysis multiterminal Hybrid HVDC system under different control strategies to the response characteristic of AC fault.The failure response analysis method of the multiterminal Hybrid HVDC system, including：Build multiterminal Hybrid HVDC system, the multiterminal Hybrid HVDC system includes multiple current conversion stations, and current conversion station described in wherein at least one is converting plant, and at least one current conversion station is Inverter Station, and the converting plant is line commutation current conversion station, the Inverter Station is voltage-source type current conversion station；Control strategy is established to the multiterminal Hybrid HVDC system；The multiterminal Hybrid HVDC system is analyzed under the control strategy, the response characteristic of the multiterminal Hybrid HVDC system on AC failure.

Description

The failure response analysis method and system of multiterminal Hybrid HVDC system
Technical field
The present invention relates to technical field of direct current power transmission, more particularly to a kind of failure response of multiterminal Hybrid HVDC system Analysis method and system.
Background technology
In recent years, multi-terminal HVDC transmission (Multi-terminal high-voltage Direct Current, MTDC) System is used as more flexible power transmission mode, in the interconnection of more AC networks, multiple feed and more drop points by electricity etc. advantage It is prominent, widely paid close attention to and applied.At present, multi-terminal direct current transmission system is mainly changed including the power network based on IGCT technology The multi-terminal direct current transmission system of phase transverter (Line Commutated Converter, LCC) and based on voltage source converter The multi-terminal direct current transmission system of (Voltage Source Converter, VSC), wherein, LCC-MTDC have transmission capacity it is big, Low cost and other advantages, but inverter side commutation failure, receiving end weak AC system operation difficulty generally be present, supplied without normal direction passive system The shortcomings of electric, and VSC-MTDC has the advantages that power adjusting is flexible, can be powered to exchange light current net even passive power network, But it is usual the shortcomings of involving great expense, running wastage is larger to be present, constrain LCC-MTDC's and VSC-MTDC to a certain extent Using.
In view of LCC-MTDC and VSC-MTDC have the advantage that respectively and shortcoming, researcher propose LCC-MTDC and The DC transmission system that VSC-MTDC is combined, i.e., LCC and VSC is arranged in DC transmission system simultaneously, and LCC is arranged in Rectification side, VSC is arranged in inverter side, forms multiterminal Hybrid HVDC system, is distinguished using LCC-MTDC and VSC-MTDC Have the advantage that, and overcome LCC-MTDC and VSC-MTDC to distinguish disadvantage, thus widely paid close attention to.Multiterminal mix DC transmission system has been in step as a kind of new HVDC Transmission Technology to multiterminal Hybrid HVDC systematic research Section, research and analysis multiterminal Hybrid HVDC system very must under different control strategies to the response characteristic of AC fault Will.
The content of the invention
It is an object of the invention to provide a kind of failure response analysis method of multiterminal Hybrid HVDC system and system, For research and analysis multiterminal Hybrid HVDC system under different control strategies to the response characteristic of AC fault.
To achieve these goals, the present invention provides following technical scheme：
On the one hand, the present invention provides a kind of failure response analysis method of multiterminal Hybrid HVDC system, including：
Multiterminal Hybrid HVDC system is built, the multiterminal Hybrid HVDC system includes multiple current conversion stations, wherein At least one current conversion station is converting plant, and at least one current conversion station is Inverter Station, and the converting plant is line commutation Current conversion station, the Inverter Station are voltage-source type current conversion station；
Control strategy is established to the multiterminal Hybrid HVDC system；
The multiterminal Hybrid HVDC system is analyzed under the control strategy, the multiterminal Hybrid HVDC system To the response characteristic of AC fault.
Preferably, multiterminal Hybrid HVDC system is built, including：
The topological structure of the multiterminal Hybrid HVDC system is built, wherein, the multiterminal Hybrid HVDC system Including AC system, direct current station control system, line commutation current conversion station, line commutation current conversion station pole control system, the voltage-source type change of current Stand, voltage-source type current conversion station pole control system, DC line, direct current station control system respectively with the line commutation current conversion station pole Control system connects with the voltage-source type current conversion station pole control system, the line commutation current conversion station pole control system with it is corresponding described Line commutation current conversion station connects, and the voltage-source type current conversion station pole control system connects with the corresponding voltage-source type current conversion station, The line commutation current conversion station connects with the corresponding AC system, the voltage-source type current conversion station and the corresponding exchange System connects, and the line commutation current conversion station, the voltage-source type current conversion station are connected to described straight in parallel or serial fashion On Flow Line；
Determine that the AC between the voltage-source type current conversion station and the corresponding AC system is coupled the ginseng of transformer The parameter of power modules, the parameter of DC line and the multiterminal mixed DC are defeated in several, described voltage-source type current conversion station The parameter of electric system median filter.
Preferably, control strategy is established to the multiterminal Hybrid HVDC system, including：
The control strategy of each current conversion station is determined, wherein, the control strategy of the current conversion station is control DC current plan Omit or control DC voltage strategy.
Preferably, the multiterminal Hybrid HVDC system is analyzed under the control strategy, the multiterminal mixed DC Transmission system to the response characteristic of AC fault, including：
According to the control strategy of the multiterminal Hybrid HVDC system and the multiterminal Hybrid HVDC system, establish When not occurring AC fault in the multiterminal Hybrid HVDC system, the control characteristic curve of each current conversion station；
According to the control strategy of the multiterminal Hybrid HVDC system and the multiterminal Hybrid HVDC system, establish When there is AC fault in current conversion station side described in any of which in the multiterminal Hybrid HVDC system, the control of each current conversion station Characteristic curve processed；
During according to not occurring AC fault in the multiterminal Hybrid HVDC system, the control characteristic of each current conversion station It is each described when AC fault occurs in current conversion station side described in any of which in curve, and the multiterminal Hybrid HVDC system The control characteristic curve of current conversion station, establish current conversion station side described in any of which in the multiterminal Hybrid HVDC system and hand over When flowing failure, resonse characteristic of each current conversion station to AC fault.
On the other hand, the present invention provides a kind of failure response analysis system of multiterminal Hybrid HVDC system, including：Take Build the multiterminal Hybrid HVDC system building platform of multiterminal Hybrid HVDC system, to the multiterminal Hybrid HVDC system The control strategy that control strategy is found in construction in a systematic way establishes platform and the analysis multiterminal Hybrid HVDC system in the control plan The failure response analysis platform of the response characteristic of the multiterminal Hybrid HVDC system on AC failure under slightly, wherein,
The control strategy is established platform and is connected with the multiterminal Hybrid HVDC system building platform, and the failure is rung Answer analysis platform to establish platform with the multiterminal Hybrid HVDC system building platform and the control strategy respectively to be connected.
Preferably, the multiterminal Hybrid HVDC system building platform builds unit including topological structure and parameter determines Unit, wherein,
The topological structure builds the topological structure that unit builds the multiterminal Hybrid HVDC system, and the multiterminal mix Closing DC transmission system includes AC system, direct current station control system, line commutation current conversion station, line commutation current conversion station pole control system System, voltage-source type current conversion station, voltage-source type current conversion station pole control system, DC line, direct current station control system respectively with it is described Line commutation current conversion station pole control system connects with the voltage-source type current conversion station pole control system, the line commutation current conversion station pole control System connects with the corresponding line commutation current conversion station, the voltage-source type current conversion station pole control system and the corresponding voltage Source type current conversion station connection, the line commutation current conversion station connect with the corresponding AC system, the voltage-source type current conversion station Connect with the corresponding AC system, the line commutation current conversion station, the voltage-source type current conversion station are with parallel or series Mode is connected on the DC line；
The parameter determination unit is built unit with the topological structure and is connected, and the parameter determination unit determines the electricity AC between potential source type current conversion station and the corresponding AC system is coupled the parameter of transformer, the voltage-source type change of current The ginseng of the parameter of power modules, the parameter of DC line and the multiterminal Hybrid HVDC system median filter in standing Number.
Preferably, the failure response analysis platform establishes unit, Fault Control characteristic including normal control characteristic curve Curve establishes unit and fault response characteristics curve establishes unit；Wherein,
The normal control characteristic curve establish unit respectively with the multiterminal Hybrid HVDC system building platform and The control strategy establishes platform connection, and the normal control characteristic curve is established in the multiterminal Hybrid HVDC system not When there is AC fault, the control characteristic curve of each current conversion station；
The Fault Control characteristic curve establish unit respectively with the multiterminal Hybrid HVDC system building platform and The control strategy establishes platform connection, and the Fault Control characteristic curve establishes its in the multiterminal Hybrid HVDC system In any current conversion station when there is AC fault, the control characteristic curve of each current conversion station；
The fault response characteristics curve establishes unit and establishes unit and described with the normal control characteristic curve respectively Fault Control characteristic curve establishes unit connection, and the fault response characteristics curve establishes unit and establishes the multiterminal mixed DC When AC fault occurs in current conversion station described in any of which in transmission system, each current conversion station is bent to the response characteristic of AC fault Line.
In the failure response analysis method and system of multiterminal Hybrid HVDC system provided by the invention, first build more Hybrid HVDC system is held, control strategy then is established to the multiterminal Hybrid HVDC system built, then multiterminal mixed The response characteristic for closing AC fault of the DC transmission system under control strategy is analyzed, defeated to multiterminal mixed DC to realize The response characteristic of AC fault of the electric system under control strategy is analyzed and studied, and then judges multiterminal Hybrid HVDC System is stable under control strategy, to verify the validity of multiterminal Hybrid HVDC system control strategy.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the present invention, this hair Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the flow chart of the failure response analysis method of multiterminal Hybrid HVDC system provided in an embodiment of the present invention One；
Fig. 2 is the flow chart of the failure response analysis method of multiterminal Hybrid HVDC system provided in an embodiment of the present invention Two；
Fig. 3 is the structural representation of multiterminal Hybrid HVDC system provided in an embodiment of the present invention；
When Fig. 4 is that multiterminal Hybrid HVDC system AC fault does not occur under the first control strategy in Fig. 3, respectively change Flow the control characteristic curve map at station；
When Fig. 5 is that multiterminal Hybrid HVDC system AC fault does not occur under second of control strategy in Fig. 3, respectively change Flow the control characteristic curve map at station；
Fig. 6 is that multiterminal Hybrid HVDC system line commutation current conversion station side under the first control strategy occurs in Fig. 3 After AC fault, the control characteristic curve map of each current conversion station；
Fig. 7 is that multiterminal Hybrid HVDC system line commutation current conversion station side under second of control strategy occurs in Fig. 3 After AC fault, the control characteristic curve map of each current conversion station；
Fig. 8 is multiterminal Hybrid HVDC system first voltage source type current conversion station side under the first control strategy in Fig. 3 After there is AC fault, the control characteristic curve map of each current conversion station；
Fig. 9 is multiterminal Hybrid HVDC system first voltage source type current conversion station side under second of control strategy in Fig. 3 After there is AC fault, the control characteristic curve map of each current conversion station；
Figure 10 is multiterminal Hybrid HVDC system the second voltage source type current conversion station side under the first control strategy in Fig. 3 After there is AC fault, the control characteristic curve map of each current conversion station；
Figure 11 is multiterminal Hybrid HVDC system the second voltage source type current conversion station side under second of control strategy in Fig. 3 After there is AC fault, the control characteristic curve map of each current conversion station；
Figure 12 is multiterminal Hybrid HVDC system in Fig. 3 respectively in the first control strategy and second of control strategy Under, after there is AC fault in line commutation current conversion station side, resonse characteristic figure of the line commutation current conversion station to AC fault；
Figure 13 is multiterminal Hybrid HVDC system in Fig. 3 respectively in the first control strategy and second of control strategy Under, after there is AC fault in line commutation current conversion station side, resonse characteristic of the first voltage source type current conversion station to AC fault Figure；
Figure 14 is multiterminal Hybrid HVDC system in Fig. 3 respectively in the first control strategy and second of control strategy Under, after there is AC fault in line commutation current conversion station side, resonse characteristic of the second voltage source type current conversion station to AC fault Figure；
Figure 15 is multiterminal Hybrid HVDC system in Fig. 3 respectively in the first control strategy and second of control strategy Under, after there is AC fault in first voltage source type current conversion station side, resonse characteristic of the line commutation current conversion station to AC fault Figure；
Figure 16 is multiterminal Hybrid HVDC system in Fig. 3 respectively in the first control strategy and second of control strategy Under, after there is AC fault in first voltage source type current conversion station side, response characteristic of the first voltage source type current conversion station to AC fault Curve map；
Figure 17 is multiterminal Hybrid HVDC system in Fig. 3 respectively in the first control strategy and second of control strategy Under, after there is AC fault in first voltage source type current conversion station side, response characteristic of the second voltage source type current conversion station to AC fault Curve map；
Figure 18 is multiterminal Hybrid HVDC system in Fig. 3 respectively in the first control strategy and second of control strategy Under, after there is AC fault in the second voltage source type current conversion station side, resonse characteristic of the line commutation current conversion station to AC fault Figure；
Figure 19 is multiterminal Hybrid HVDC system in Fig. 3 respectively in the first control strategy and second of control strategy Under, after there is AC fault in the second voltage source type current conversion station side, response characteristic of the first voltage source type current conversion station to AC fault Curve map；
Figure 20 is multiterminal Hybrid HVDC system in Fig. 3 respectively in the first control strategy and second of control strategy Under, after there is AC fault in the second voltage source type current conversion station side, response characteristic of the second voltage source type current conversion station to AC fault Curve map；
The structure that Figure 21 provides the failure response analysis system of multiterminal Hybrid HVDC system for the embodiment of the present invention is shown It is intended to.
Reference：
1- DC lines；
2- line commutation current conversion stations；
3- rectification side AC systems；
4- line commutation current conversion station pole control systems；
5- first voltage source type current conversion stations；
6- the first inverter side AC systems；
7- first voltage source type current conversion station pole control systems；
8- the second voltage source type current conversion stations；
9- the second inverter side AC systems；
10- the second voltage source type current conversion station pole control systems；
Control system in 11- direct currents station；
100- multiterminal Hybrid HVDC system building platforms；
110- topological structures build unit；
120- parameter determination units；
200- control strategies establish platform；
300- failure response analysis platforms；
310- is normal, and control characteristic curve establishes unit；
320- Fault Control characteristic curves establish unit；
330- fault response characteristics curves establish unit.
Embodiment
In order to further illustrate the failure response analysis side of multiterminal Hybrid HVDC system provided in an embodiment of the present invention Method and system, are described in detail with reference to Figure of description.
Referring to Fig. 1, the failure response analysis method bag of multiterminal Hybrid HVDC system provided in an embodiment of the present invention Include：
Step S100, multiterminal Hybrid HVDC system is built, multiterminal Hybrid HVDC system includes multiple current conversion stations, Wherein at least one current conversion station is converting plant, and at least one current conversion station is Inverter Station, and converting plant is line commutation current conversion station, inverse Become station as voltage-source type current conversion station.
Step S200, control strategy is established to multiterminal Hybrid HVDC system.
Step S300, multiterminal Hybrid HVDC system is analyzed under control strategy, multiterminal Hybrid HVDC system pair The response characteristic of AC fault.
Specifically, multiterminal Hybrid HVDC system is built first, wherein, when building multiterminal Hybrid HVDC system, It can be carried out using electromagnetic transient state procedure, specifically, PSCAD/EMTDC (Power Systems Computer can be used Aided Design, PSCAD) carry out；After completing the building of multiterminal Hybrid HVDC system, to multiterminal Hybrid HVDC system Control strategy is found in construction in a systematic way, and when establishing control strategy to multiterminal Hybrid HVDC system, the quantity of control strategy can be one Kind, or it is a variety of；After completing the foundation to the control strategy of multiterminal Hybrid HVDC system, then it is straight to set multiterminal mixing The AC system for certain current conversion station side in AC fault, such as multiterminal Hybrid HVDC system occur in stream transmission system is handed over The failure of flow short-circuit, with to multiterminal Hybrid HVDC system under control strategy to there is AC fault when operation situation enter Row emulation, and then multiterminal Hybrid HVDC system is analyzed under control strategy, the event of multiterminal Hybrid HVDC system on AC The response characteristic of barrier.
From the foregoing, in the failure response analysis method of multiterminal Hybrid HVDC system provided in an embodiment of the present invention In, multiterminal Hybrid HVDC system is first built, control strategy then is established to the multiterminal Hybrid HVDC system built, so The response characteristic of the AC fault to multiterminal Hybrid HVDC system under control strategy is analyzed afterwards, to realize to multiterminal The response characteristic of AC fault of the Hybrid HVDC system under control strategy is analyzed and studied, and then judges that multiterminal mix It is stable under control strategy to close DC transmission system, to verify the effective of multiterminal Hybrid HVDC system control strategy Property.
In the above-described embodiments, using PSCAD/EMTDC (Power Systems Computer Aided Design, When PSCAD) building multiterminal Hybrid HVDC system, the main topological structure including multiterminal Hybrid HVDC system is built And in each topological structure the parameter of each several part determination, specifically, referring to Fig. 2, step S100, building multiterminal mixed DC Transmission system, it can include：
Step S110, the topological structure of multiterminal Hybrid HVDC system, wherein multiterminal Hybrid HVDC system are built Including AC system, direct current station control system, line commutation current conversion station, line commutation current conversion station pole control system, the voltage-source type change of current Stand, voltage-source type current conversion station pole control system, DC line, direct current station control system respectively with line commutation current conversion station pole control system and Voltage-source type current conversion station pole control system connects, and line commutation current conversion station pole control system connects with corresponding line commutation current conversion station, Voltage-source type current conversion station pole control system connects with corresponding voltage-source type current conversion station, and line commutation current conversion station is with corresponding exchange System connection, voltage-source type current conversion station connect with corresponding AC system, and line commutation current conversion station, voltage-source type current conversion station are with parallel connection Or the mode of series connection is connected on DC line.
Step S120, determine that the AC between voltage-source type current conversion station and corresponding AC system is coupled the ginseng of transformer In number, voltage-source type current conversion station in the parameter of power modules, the parameter of DC line and multiterminal Hybrid HVDC system The parameter of wave filter.
For example, three ends are included using multiterminal Hybrid HVDC system and wherein one end is converting plant both ends as Inverter Station Exemplified by illustrate, referring to Fig. 3, multiterminal Hybrid HVDC system includes three ends, wherein one end is converting plant, and both ends are inverse Become station, converting plant is line commutation current conversion station 2, i.e., the transverter in converting plant is line commutation transverter, and both ends Inverter Station is divided Not Wei first voltage source type current conversion station 5 and the second voltage source type current conversion station 8, i.e., the voltage-source type change of current of the transverter in Inverter Station Device, wherein, line commutation current conversion station 2 is connected with rectification side AC system 3 and line commutation current conversion station pole control system 4 respectively, the One voltage-source type current conversion station 5 is connected with the first inverter side AC system 6 and first voltage source type current conversion station pole control system 7 respectively, The second voltage source type current conversion station 8 connects with the second inverter side AC system 9 and the second voltage source type current conversion station pole control system 10 respectively Connect, line commutation current conversion station pole control system 4, first voltage source type current conversion station pole control system 7 and the second voltage source type current conversion station pole Control system 10 is connected with direct current station control system 11, line commutation current conversion station 2, first voltage source type current conversion station 5 and second voltage Source type current conversion station 8 is connected on DC line 1 in parallel or serial fashion, in embodiments of the present invention, please continue to refer to 3, Line commutation current conversion station 2, first voltage source type current conversion station 5 and the second voltage source type current conversion station 8 are connected to directly in parallel On Flow Line 1, i.e., multiterminal Hybrid HVDC system is multiterminal parallel connection type Hybrid HVDC system.
After the completion of the topological structure of multiterminal Hybrid HVDC system is built, then multiterminal Hybrid HVDC system is opened up The parameter for each several part flutterred in structure is determined, in embodiments of the present invention, main to include changing voltage-source type in Inverter Station Flow the friendship between parameter, the parameter of DC line, voltage-source type current conversion station and the corresponding AC system of the power modules of device Flow the determination that side is coupled the parameter of transformer and the parameter of multiterminal Hybrid HVDC system median filter.
For example, first voltage source type current conversion station 5 and the second voltage source type current conversion station 8 are Inverter Station in Fig. 3, and first Relevant parameter can use identical parameter in relevant parameter and the second voltage source type current conversion station 8 in voltage-source type current conversion station 5, inverse , it is necessary to consider transformer overload when the transverter become in station is power line transverter, thus Inverter Station and inverter side AC system Between AC be coupled transformer can use three single-phase transformers, the capacity of each single-phase transformer is 200MVA；Electricity The rated voltage of power device in the power modules of potential source type transverter is set as 1600V, every in voltage source converter The quantity of the power modules of bridge arm is 220, then the total quantity of power modules is 1320 in voltage source converter, its In, the capacitance C of the electric capacity in power modules can be：
Wherein, m is modulation ratio, and ω is power frequency angular frequency, and ε is voltage fluctuation of capacitor amplitude, UdcFor DC voltage, N is volume Determine power modules number, S is apparent energy, and cos φ are power-factor angle, and λ is that (i.e. redundant power submodule accounts for specified redundancy ratio The ratio of power modules).Under declared working condition, it is assumed that m=0.85, ε=0.1, cos φ=0.957, then can calculate symmetric double The capacitance of electric capacity in the power modules of pole scheme, when the rated voltage of the power device in power modules uses 3300V When, the minimum value of the capacitance of electric capacity is 12mF in the power modules.
After the capacitance of electric capacity determines in power modules, then Inverter Station can be determined using bridge arm during symmetrical bipolar scheme The reactance value L of reactor, specifically, can be according to 2 frequency multiplication circulation Icir2Approximate calculation determine, 2 frequency multiplication circulation Icir2It is near It is like calculation basis：
Wherein, I is DC current.
According to the requirement being limited in 2 frequency multiplication circulation within power current 30%, when the power device in power modules Rated voltage when using 3300V, Inverter Station using bridge arm reactor during symmetrical bipolar scheme the minimum 60mH of reactance value L.
Please continue to refer to Fig. 3, the DC line 1 between line commutation current conversion station 2 and first voltage source type current conversion station 5 uses 50km overhead line equivalent models, the DC line 1 between line commutation current conversion station 2 and the second voltage source type current conversion station 8 use 10km overhead line equivalent models, and 0.15H smoothing reactor has been selected on direct-current polar, and devise wave filter on DC side and Neutral point wave filter.
It is main to include to multiterminal Hybrid HVDC system when determining the parameter of multiterminal Hybrid HVDC system median filter The parameter of alternating current filter is determined in system, for example, when multiterminal Hybrid HVDC system is opened up using as shown in Figure 3 When flutterring structure, alternating current filter configures two groups, and one of which is No. 3/12 double-tuned filter, and another group is that 6 single tunings are filtered Ripple device, wherein, 6 single tuned filters mainly filter out 300Hz harmonic wave, and it is C=that 6 single tuned filters, which choose capacitance parameter, 2 μ F, then according to series resonance formula：The reactance parameter for obtaining 6 single tuned filters is L=140mH.Setting The tuned frequency of No. 3/12 double-tuned filter includes：f1=150Hz, f2=600Hz, No. 3/12 double-tuned filter are chosen high Piezoelectric capsule capacitance C1=2 μ F, No. 3/12 time double-tuned filter chooses frequency in parallelList resonance point equation：
Wherein, L1For No. 3/12 double-tuned filter mesohigh side inductance value；C2For No. 3/12 double-tuned filter mesolow Lateral capacitance value, L2For No. 3/12 double-tuned filter mesolow side inductance value.
Solution formula (3), each component parameters in No. 3/12 double-tuned filter can be derived：L1=56mH, C2=1.16 μ F, L2=1.86mH.
Please continue to refer to Fig. 2, in embodiments of the present invention, step S200, multiterminal Hybrid HVDC system is established and controlled System strategy, can include：
Step S210, the control strategy of each current conversion station is determined, wherein, the control strategy of current conversion station is control DC current plan Omit or control DC voltage strategy.
For example, the topological structure of multiterminal Hybrid HVDC system uses topological structure as shown in Figure 3, to multiterminal Hybrid HVDC system establishes control strategy, that is, determines line commutation current conversion station 2, the and of first voltage source type current conversion station 5 in Fig. 3 The control strategy of the second voltage source type current conversion station 8, wherein, the control strategy of current conversion station can be control DC current strategy, or Person, the control strategy of current conversion station can also be control DC voltage strategy.
In embodiments of the present invention, two kinds of control strategies are established to multiterminal Hybrid HVDC system, wherein, the first control Strategy processed is：The control strategy of line commutation current conversion station 2 is to control DC current strategy, the control of first voltage source type current conversion station 5 System strategy is control DC voltage strategy, and the control strategy of the second voltage source type current conversion station 8 is control DC current strategy；Second Planting control strategy is：The control strategy of line commutation current conversion station 2 is to control DC voltage strategy, first voltage source type current conversion station 5 Control strategy be control DC current strategy, the control strategy of the second voltage source type current conversion station 8 is control DC current strategy.
Please continue to refer to Fig. 2, in embodiments of the present invention, step S300, analysis multiterminal Hybrid HVDC system is being controlled Under system strategy, the response characteristic of multiterminal Hybrid HVDC system on AC failure, it can include：
Step S310, according to the control strategy of multiterminal Hybrid HVDC system and multiterminal Hybrid HVDC system, build When not occurring AC fault in vertical multiterminal Hybrid HVDC system, the control characteristic curve of each current conversion station.
Step S320, according to the control strategy of multiterminal Hybrid HVDC system and multiterminal Hybrid HVDC system, build When AC fault occurs in any of which current conversion station side in vertical multiterminal Hybrid HVDC system, the control characteristic of each current conversion station is bent Line.
When step S330, according to not occurring AC fault in multiterminal Hybrid HVDC system, the control of each current conversion station is special When there is AC fault in any of which current conversion station side in linearity curve, and multiterminal Hybrid HVDC system, the control of each current conversion station Characteristic curve processed, when establishing that AC fault occurs in any of which current conversion station side in multiterminal Hybrid HVDC system, each current conversion station To the resonse characteristic of AC fault.
For example, multiterminal Hybrid HVDC system is using the topological structure shown in Fig. 3, multiterminal Hybrid HVDC system The control strategy of system includes two kinds, and the first control strategy is：The control strategy of line commutation current conversion station 2 is control DC current Strategy, the control strategy of first voltage source type current conversion station 5 are to control DC voltage strategy, the control of the second voltage source type current conversion station 8 System strategy is control DC current strategy；Second of control strategy be：The control strategy of line commutation current conversion station 2 is control direct current Voltage strategy, the control strategy of first voltage source type current conversion station 5 are to control DC current strategy, the second voltage source type current conversion station 8 Control strategy for control DC current strategy.
First, according to the control strategy of multiterminal Hybrid HVDC system and multiterminal Hybrid HVDC system, establish more When not occurring AC fault in the Hybrid HVDC system of end, the control characteristic curve of each current conversion station, multiterminal Hybrid HVDC System is under the first control strategy, when not occurring AC fault in multiterminal Hybrid HVDC system, the control of each current conversion station Characteristic curve is as shown in figure 4, wherein, and (a) shows the control characteristic curve of line commutation current conversion station 2 in Fig. 4, and (b) shows in Fig. 4 The control characteristic curve of first voltage source type current conversion station 5 is gone out, (c) shows the control of the second voltage source type current conversion station 8 in Fig. 4 Characteristic curve；Multiterminal Hybrid HVDC system does not occur under second of control strategy in multiterminal Hybrid HVDC system During AC fault, the control characteristic curve of each current conversion station is as shown in figure 5, wherein, (a) shows line commutation current conversion station 2 in Fig. 5 Control characteristic curve, (b) shows the control characteristic curve of first voltage source type current conversion station 5 in Fig. 5, and (c) is shown in Fig. 5 The control characteristic curve of the second voltage source type current conversion station 8.
Then, according to the control strategy of multiterminal Hybrid HVDC system and multiterminal Hybrid HVDC system, establish more When there is AC fault in any of which current conversion station side in the Hybrid HVDC system of end, the control characteristic curve of each current conversion station.
Specifically, multiterminal Hybrid HVDC system is under the first control strategy, in multiterminal Hybrid HVDC system When AC fault occurs in the side of line commutation current conversion station 2, the control characteristic curve of each current conversion station is as shown in fig. 6, wherein, in Fig. 6 (a) Show the control characteristic curve of line commutation current conversion station 2, (b) shows that the control of first voltage source type current conversion station 5 is special in Fig. 6 Linearity curve, (c) shows the control characteristic curve of the second voltage source type current conversion station 8 in Fig. 6, now, in line commutation current conversion station 2 Change of current busbar voltage, which reduces, causes the reduction of the voltage of DC line 1, so as to which DC current reduces, into current limiting low-voltage link, power network The operating point of commutation current conversion station 2 changes to B by the A in (a) in Fig. 6, and first voltage source type current conversion station 5 is switched by constant voltage mode To constant current mode, the operating point of first voltage source type current conversion station 5 is by the A in (b) in Fig. 61Change to B1, the second voltage source type Current conversion station 8 still keeps constant current mode, and the operating point of the second voltage source type current conversion station 8 is by the A in (c) in Fig. 62Change to B2。
Multiterminal Hybrid HVDC system is under second of control strategy, line commutation in multiterminal Hybrid HVDC system When AC fault occurs in the side of current conversion station 2, the control characteristic curve of each current conversion station is as shown in fig. 7, wherein, (a) shows electricity in Fig. 7 The control characteristic curve of net commutation current conversion station 2, (b) shows the control characteristic curve of first voltage source type current conversion station 5 in Fig. 7, (c) shows the control characteristic curve of the second voltage source type current conversion station 8 in Fig. 7, and now, the side of line commutation current conversion station 2 is occurring The control ability to DC voltage is lost after AC fault, the control strategy of line commutation current conversion station 2 is transferred to current limiting low-voltage control Strategy, the operating point of line commutation current conversion station 2 change to B, the control of first voltage source type current conversion station 5 by the A in (a) in Fig. 7 The control strategy of strategy and the second voltage source type current conversion station 8 is also transferred to current limiting low-voltage control strategy because the voltage of DC line 1 reduces, The operating point of first voltage source type current conversion station 5 is by the A in (b) in Fig. 71Change to B1, the operation of the second voltage source type current conversion station 8 Point is by the A in (c) in Fig. 72Change to B2。
Multiterminal Hybrid HVDC system is under the first control strategy, first voltage in multiterminal Hybrid HVDC system When AC fault occurs in the side of source type current conversion station 5, the control characteristic curve of each current conversion station is as shown in figure 8, wherein, (a) is shown in Fig. 8 The control characteristic curve of line commutation current conversion station 2, (b) shows that the control characteristic of first voltage source type current conversion station 5 is bent in Fig. 8 Line, (c) shows the control characteristic curve of the second voltage source type current conversion station 8, now, the side of first voltage source type current conversion station 5 in Fig. 8 The AC fault of appearance causes the change of current busbar voltage in first voltage source type current conversion station 5 to reduce, first voltage source type current conversion station 5 Transmission power reduce, the ability that first voltage source type current conversion station 5 adjusts DC voltage declines, and the He of line commutation current conversion station 2 The second voltage source type current conversion station 8 does not possess the function of automatic power adjustment, therefore electric energy can be to first voltage source type current conversion station 5 The electric capacity charging of middle power modules, the side DC voltage rise of first voltage source type current conversion station 5, first voltage source type current conversion station 5 Operating point by the A in (b) in Fig. 81Change to B1, line commutation current conversion station 2 then enters minimum of alpha angle control policy, line commutation The operating point of current conversion station 2 changes to B by the A in (a) in Fig. 8, and the operating point of the second voltage source type current conversion station 8 is by (c) in Fig. 8 A2Change to B2。
Multiterminal Hybrid HVDC system is under second of control strategy, first voltage in multiterminal Hybrid HVDC system When AC fault occurs in the side of source type current conversion station 5, the control characteristic curve of each current conversion station is as shown in figure 9, wherein, (a) is shown in Fig. 9 The control characteristic curve of line commutation current conversion station 2, (b) shows that the control characteristic of first voltage source type current conversion station 5 is bent in Fig. 9 Line, (c) shows the control characteristic curve of the second voltage source type current conversion station 8, now, the side of first voltage source type current conversion station 5 in Fig. 9 The AC fault of appearance causes line commutation current conversion station 2 to reduce to the active power that rectification side AC system 3 conveys, DC line 1 DC voltage instantaneously raises, and in the case where line commutation current conversion station 2 determines voltage control coordinative role, will reduce and is conveyed to DC line 1 Active power, the DC voltage of DC line 1 recovers stable, and the operating point of line commutation current conversion station 2 is become by the A in (a) in Fig. 9 Change to B, the power that first voltage source type current conversion station 5 loses will be dissolved by line commutation current conversion station 2, first voltage source type current conversion station 5 operating point is by the A in (b) in Fig. 91Change turns to B1, during the AC fault that the side of first voltage source type current conversion station 5 occurs, the The side dc power of two voltage-source type current conversion station 8 fluctuates with the fluctuation of DC voltage, but fluctuation range is smaller, is basically stable at and sets Determine performance number, the operating point of the second voltage source type current conversion station 8 keeps the A in (c) in fig.92。
Multiterminal Hybrid HVDC system is under the first control strategy, second voltage in multiterminal Hybrid HVDC system When AC fault occurs in the side of source type current conversion station 8, the control characteristic curve of each current conversion station is as shown in Figure 10, wherein, (a) shows in Figure 10 The control characteristic curve of line commutation current conversion station 2 is gone out, (b) shows that the control of first voltage source type current conversion station 5 is special in Figure 10 Linearity curve, (c) shows the control characteristic curve of the second voltage source type current conversion station 8, now, the second voltage source type change of current in Figure 10 8 side current failures of standing cause first voltage source type current conversion station 5 by voltage controller quick regulation current reference value, so as to increase Inverter Station is delivered to the active power of corresponding AC system, and the remaining power in failure station is transferred into our station, that is, increases first Voltage-source type current conversion station 5 is delivered to the active power of the first inverter side AC system 6, and the second voltage source type current conversion station 8 is remaining Power be transferred to first voltage source type current conversion station 5, to ensure the stabilization of DC voltage and power-balance, line commutation current conversion station 2 operating point changes to B by the A in (a) in Figure 10, and the operating point of first voltage source type current conversion station 5 is by the A in (b) in Figure 101 Change turns to B1, the operating point of the second voltage source type current conversion station 8 keeps the A in (c) in Fig. 102Change turns to B2。
Multiterminal Hybrid HVDC system is under second of control strategy, second voltage in multiterminal Hybrid HVDC system When AC fault occurs in the side of source type current conversion station 8, the control characteristic curve of each current conversion station is as shown in figure 11, wherein, (a) shows in Figure 11 The control characteristic curve of line commutation current conversion station 2 is gone out, (b) shows that the control of first voltage source type current conversion station 5 is special in Figure 11 Linearity curve, (c) shows the control characteristic curve of the second voltage source type current conversion station 8 in Figure 11, now, is changed with first voltage source type 5 sides of stream station occur similar during AC fault, will not be repeated here, wherein, the operating point of line commutation current conversion station 2 is by Figure 11 (a) A in changes to B, and the operating point of first voltage source type current conversion station 5 keeps the A in (b) in fig. 111, the second voltage source type The operating point of current conversion station 8 keeps the A in (c) in fig. 112Change turns to B2。
When then, according to not occurring AC fault in multiterminal Hybrid HVDC system, the control characteristic of each current conversion station is bent When AC fault occurs in any of which current conversion station side in line, and multiterminal Hybrid HVDC system, the control of each current conversion station is special Linearity curve, when establishing that AC fault occurs in any of which current conversion station side in multiterminal Hybrid HVDC system, each current conversion station is to handing over Flow the resonse characteristic of failure, that is to say, that the control characteristic curve in Fig. 4, Fig. 6, Fig. 8 and Figure 10, establish multiterminal Hybrid HVDC system is under the first control strategy, and any of which current conversion station side occurs in multiterminal Hybrid HVDC system During AC fault, each current conversion station is to the resonse characteristic of AC fault, the control characteristic in Fig. 5, Fig. 7, Fig. 9 and Figure 11 Curve, multiterminal Hybrid HVDC system is established under second of control strategy, wherein appoint in multiterminal Hybrid HVDC system When there is AC fault in one current conversion station side, resonse characteristic of each current conversion station to AC fault.
Specifically, be set in the steady operational status of multiterminal Hybrid HVDC system before AC fault for DC voltage ± 160kV, the dc power 1000MW of line commutation current conversion station 2, the dc power of first voltage source type current conversion station 5 is 600MW, the The dc power of two voltage-source type current conversion stations 8 is 400MW.Multiterminal Hybrid HVDC system respectively in the first control strategy and Under second of control strategy, after AC fault occurs in the side of line commutation current conversion station 2, line commutation current conversion station 2 is to AC fault Resonse characteristic is as shown in figure 12, wherein, (a) shows the DC voltage response characteristic of line commutation current conversion station 2 in Figure 12 Curve, (b) shows the DC current resonse characteristic of line commutation current conversion station 2 in Figure 12, and (c) shows power network in Figure 12 The dc power resonse characteristic of commutation current conversion station 2, resonse characteristic of the first voltage source type current conversion station 5 to AC fault As shown in figure 13, wherein, (a) shows the DC voltage resonse characteristic of first voltage source type current conversion station 5, Figure 13 in Figure 13 In (b) show the DC current resonse characteristic of first voltage source type current conversion station 5, (c) shows first voltage in Figure 13 The dc power resonse characteristic of source type current conversion station 5, resonse characteristic of the second voltage source type current conversion station 8 to AC fault As shown in figure 14, wherein, (a) shows the DC voltage resonse characteristic of the second voltage source type current conversion station 8, Figure 14 in Figure 14 In (b) show the DC current resonse characteristic of the second voltage source type current conversion station 8, (c) shows second voltage in Figure 14 The dc power resonse characteristic of source type current conversion station 8, in Figure 12, Figure 13 and Figure 14, solid line is each current conversion station at the first To the resonse characteristic of AC fault under control strategy (strategy 1 is shown as in Figure 12, Figure 13 and Figure 14), dotted line is each change of current Stand under second of control strategy (strategy 2 is shown as in Figure 12, Figure 13 and Figure 14) to the resonse characteristic of AC fault.It is more After holding Hybrid HVDC system stable operation, in 11s, it is short that three-phase occurs for the top-cross stream change of current bus of line commutation current conversion station 2 Road earth fault, failure removal after 0.1s, DC voltage, DC current and dc power are converted into each current conversion station rated value On the basis of the perunit value that is worth.From Figure 12, Figure 13 and Figure 14, multiterminal Hybrid HVDC system is under the first control strategy When, after AC fault occurs in the side of line commutation current conversion station 2, the side DC voltage of line commutation current conversion station 2 reduces, so as to DC current Reduce, into current limiting low-voltage link, now, first voltage source type current conversion station 5 loses the control to DC voltage, and line commutation changes The power of the loss of stream station 2 is dissolved by first voltage source type current conversion station 5, and the second voltage source type 8 power swings of current conversion station are little, transient state Final system recovers stable operation after process；When multiterminal Hybrid HVDC system is under second of control strategy, line commutation After AC fault occurs in the side of current conversion station 2, line commutation current conversion station 2 loses the control ability to DC voltage, the line commutation change of current 2 control strategy of standing is transferred to current limiting low-voltage control strategy, the control strategy and the second voltage source type of first voltage source type current conversion station 5 The control strategy of current conversion station 8 is also transferred to current limiting low-voltage control strategy therewith because DC voltage reduces, final system after transient process Recover stable operation.The failure response under two kinds of control strategies is contrasted, main difference is that multiterminal Hybrid HVDC system exists When under the first control strategy, the power swing of first voltage source type current conversion station 5 is larger during failure and in recovery process, the second electricity The power swing of potential source type current conversion station 8 is smaller, and recovery time is shorter, and multiterminal Hybrid HVDC system controls plan at second When slightly descending, the power of first voltage source type current conversion station 5 and the power of the second voltage source type current conversion station 8 during failure and in recovery process Fluctuation is larger, and recovery time is longer.
Multiterminal Hybrid HVDC system is respectively under the first control strategy and second of control strategy, first voltage source After AC fault occurs in the side of type current conversion station 5, line commutation current conversion station 2 is as shown in figure 15 to the resonse characteristic of AC fault, Wherein, (a) shows the DC voltage resonse characteristic of line commutation current conversion station 2 in Figure 15, and (b) shows power network in Figure 15 The DC current resonse characteristic of commutation current conversion station 2, (c) shows that the dc power of line commutation current conversion station 2 is rung in Figure 15 Characteristic curve is answered, first voltage source type current conversion station 5 is as shown in figure 16 to the resonse characteristic of AC fault, wherein, Tu16Zhong (a) the DC voltage resonse characteristic of first voltage source type current conversion station 5 is shown, (b) shows first voltage source in Figure 16 The DC current resonse characteristic of type current conversion station 5, (c) shows the dc power of first voltage source type current conversion station 5 in Figure 16 Resonse characteristic, the second voltage source type current conversion station 8 are as shown in figure 17 to the resonse characteristic of AC fault, wherein, Figure 17 In (a) show the DC voltage resonse characteristic of the second voltage source type current conversion station 8, (b) shows second voltage in Figure 17 The DC current resonse characteristic of source type current conversion station 8, (c) shows the direct current work(of the second voltage source type current conversion station 8 in Figure 17 Rate resonse characteristic, in Figure 15, Figure 16 and Figure 17, solid line is each current conversion station in the first control strategy (Figure 15, Tu16He To the resonse characteristic of AC fault under being shown as strategy in Figure 17 1), dotted line is each current conversion station in second of control strategy To the resonse characteristic of AC fault under (being shown as strategy 2 in Figure 15, Figure 16 and Figure 17).After system stable operation, in 11s When, three-phase shortcircuit earth fault occurs for the top-cross stream change of current bus of first voltage source type current conversion station 5, failure removal after 0.1s.By scheming 15th, Figure 16 and Figure 17 understands that multiterminal Hybrid HVDC system is in the first control strategy, first voltage source type current conversion station 5 After AC fault occurs in side, change of current busbar voltage reduces in first voltage source type current conversion station 5, first voltage source type current conversion station 5 Transmission power reduces, the side DC voltage rise of first voltage source type current conversion station 5, the side DC voltage rise of line commutation current conversion station 2, The side DC current of line commutation current conversion station 2 reduces, the side DC voltage rise of the second voltage source type current conversion station 8, the second voltage source type The side DC current of current conversion station 8 increases, and final system recovers stable operation after transient process；Multiterminal Hybrid HVDC system is During two kinds of control strategies, after there is AC fault in the side of first voltage source type current conversion station 5, what first voltage source type current conversion station 5 lost Power is dissolved by the side of line commutation current conversion station 2, the side dc power of the second voltage source type current conversion station 8 ripple with the fluctuation of DC voltage It is dynamic, but fluctuation range is smaller, is basically stable at 1.0pu or so, and final system recovers stable operation after transient process.Two kinds of contrast Failure response under control strategy, the response curve of line commutation current conversion station 2 and the response curve of the second voltage source type current conversion station 8 Difference is smaller, and the response for the side of first voltage source type current conversion station 5, multiterminal Hybrid HVDC system is in second of control strategy When, dc power fluctuation is smaller after failure removal, and resume speed is very fast.
Multiterminal Hybrid HVDC system is respectively under the first control strategy and second of control strategy, the second voltage source After AC fault occurs in the side of type current conversion station 8, line commutation current conversion station 2 is as shown in figure 18 to the resonse characteristic of AC fault, Wherein, (a) shows the DC voltage resonse characteristic of line commutation current conversion station 2 in Figure 18, and (b) shows power network in Figure 18 The DC current resonse characteristic of commutation current conversion station 2, (c) shows that the dc power of line commutation current conversion station 2 is rung in Figure 18 Characteristic curve is answered, first voltage source type current conversion station 5 is as shown in figure 19 to the resonse characteristic of AC fault, wherein, Tu19Zhong (a) the DC voltage resonse characteristic of first voltage source type current conversion station 5 is shown, (b) shows first voltage source in Figure 19 The DC current resonse characteristic of type current conversion station 5, (c) shows the dc power of first voltage source type current conversion station 5 in Figure 19 Resonse characteristic, the second voltage source type current conversion station 8 are as shown in figure 20 to the resonse characteristic of AC fault, wherein, Figure 20 In (a) show the DC voltage resonse characteristic of the second voltage source type current conversion station 8, (b) shows second voltage in Figure 20 The DC current resonse characteristic of source type current conversion station 8, (c) shows the direct current work(of the second voltage source type current conversion station 8 in Figure 20 Rate resonse characteristic, in Figure 18, Figure 19 and Figure 20, solid line is each current conversion station in the first control strategy (Figure 18, Tu19He To the resonse characteristic of AC fault under being shown as strategy in Figure 20 1), dotted line is each current conversion station in second of control strategy To the resonse characteristic of AC fault under (being shown as strategy 2 in Figure 18, Figure 19 and Figure 20).After system stable operation, in 11s When, three-phase shortcircuit earth fault occurs for the top-cross stream change of current bus of the second voltage source type current conversion station 8, failure removal after 0.1s.By scheming 18th, Figure 19 and Figure 20 understands that multiterminal Hybrid HVDC system is in the first control strategy, the second voltage source type current conversion station 8 After AC fault occurs in side, failure causes the dc power of the second voltage source type current conversion station 8 to reduce, the second voltage source type current conversion station 8 remaining power are transferred to first voltage source type current conversion station 5, to ensure the stabilization of DC voltage and power-balance, transient process Final system recovers stable operation afterwards；In second of control strategy, the second voltage source type changes multiterminal Hybrid HVDC system After AC fault occur in 8 sides of stream station, the active power that the lateral rectification side AC system 3 of line commutation current conversion station 2 conveys is caused to subtract Small, the power that the second voltage source type current conversion station 8 loses will be dissolved by the side of line commutation current conversion station 2, first voltage source type current conversion station 5 Side dc power is basically stable at 1.0pu or so, and final system recovers stable operation after transient process.Contrast two kinds of control strategies Under failure response, the response curve difference of the second voltage source type current conversion station 8 is smaller, for line commutation current conversion station 2 and first The response of voltage-source type current conversion station 5, multiterminal Hybrid HVDC system is under second of control strategy, and power network changes after failure removal The dc power fluctuation of phase current conversion station 2 is larger, and the dc power of first voltage source type current conversion station 5 fluctuates smaller, resume speed Comparatively fast.
Figure 21 is referred to, the embodiment of the present invention also provides a kind of failure response analysis system of multiterminal Hybrid HVDC system System, including：Build the multiterminal Hybrid HVDC system building platform 100 of multiterminal Hybrid HVDC system, multiterminal are mixed DC transmission system establish control strategy control strategy establish platform 200 and analysis multiterminal Hybrid HVDC system exist The failure response analysis platform 300 of the response characteristic of multiterminal Hybrid HVDC system on AC failure under control strategy, wherein, Control strategy is established platform 200 and is connected with multiterminal Hybrid HVDC system building platform 100, failure response analysis platform 300 Platform 200 is established with multiterminal Hybrid HVDC system building platform 100 and control strategy respectively to be connected.
The failure response analysis system of the multiterminal Hybrid HVDC system and above-mentioned multiterminal Hybrid HVDC system Failure response analysis method it is same relative to Dominant Facies possessed by prior art, will not be repeated here.
Please continue to refer to Figure 21, in embodiments of the present invention, multiterminal Hybrid HVDC system building platform 100 includes opening up Flutter structure and build unit 110 and parameter determination unit 120, wherein, topological structure builds unit 110, and to build multiterminal mixed DC defeated The topological structure of electric system, multiterminal Hybrid HVDC system include AC system, direct current station control system 11, the line commutation change of current Stand 2, line commutation current conversion station pole control system 4, voltage-source type current conversion station, voltage-source type current conversion station pole control system, DC line 1, Direct current station control system 11 is connected with line commutation current conversion station pole control system 4 and voltage-source type current conversion station pole control system respectively, power network Commutation current conversion station pole control system 4 connects with corresponding line commutation current conversion station 2, voltage-source type current conversion station pole control system with it is corresponding Voltage-source type current conversion station connects, the connection of line commutation current conversion station 2 and corresponding AC system, voltage-source type current conversion station with it is corresponding AC system connects, and line commutation current conversion station 2, voltage-source type current conversion station are connected to DC line 1 in parallel or serial fashion On；Parameter determination unit 120 is built unit 110 with topological structure and is connected, and parameter determination unit 120 determines voltage-source type current conversion station AC between corresponding AC system is coupled the ginseng of power modules in the parameter of transformer, voltage-source type current conversion station The parameter of number, the parameter of DC line 1 and multiterminal Hybrid HVDC system median filter.
Please continue to refer to Figure 21, in embodiments of the present invention, it is bent that failure response analysis platform 300 includes normal control characteristic Line establishes unit 310, Fault Control characteristic curve establishes unit 320 and fault response characteristics curve establishes unit 330；Wherein, Normal control characteristic curve is established unit 310 and built respectively with multiterminal Hybrid HVDC system building platform 100 and control strategy Vertical platform 200 is connected, and normal control characteristic curve is established when not occurring AC fault in multiterminal Hybrid HVDC system, is respectively changed Flow the control characteristic curve at station；Fault Control characteristic curve establish unit 320 respectively with multiterminal Hybrid HVDC system building Platform 100 and control strategy are established platform 200 and connected, and Fault Control characteristic curve establishes its in multiterminal Hybrid HVDC system In any current conversion station when there is AC fault, the control characteristic curve of each current conversion station；Fault response characteristics curve establishes unit 330 Unit 310 is established with normal control characteristic curve respectively and Fault Control characteristic curve is established unit 320 and is connected, failure response is special When linearity curve establishes unit 330 and establishes that AC fault occurs in any of which current conversion station in multiterminal Hybrid HVDC system, respectively change Resonse characteristic of the stream station to AC fault.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.

Claims (7)

  1. A kind of 1. failure response analysis method of multiterminal Hybrid HVDC system, it is characterised in that including：
    Multiterminal Hybrid HVDC system is built, the multiterminal Hybrid HVDC system includes multiple current conversion stations, wherein at least One current conversion station is converting plant, and at least one current conversion station is Inverter Station, and the converting plant is the line commutation change of current Stand, the Inverter Station is voltage-source type current conversion station；
    Control strategy is established to the multiterminal Hybrid HVDC system；
    The multiterminal Hybrid HVDC system is analyzed under the control strategy, the multiterminal Hybrid HVDC system is to handing over Flow the response characteristic of failure.
  2. 2. the failure response analysis method of multiterminal Hybrid HVDC system according to claim 1, it is characterised in that take Multiterminal Hybrid HVDC system is built, including：
    The topological structure of the multiterminal Hybrid HVDC system is built, wherein, the multiterminal Hybrid HVDC system includes AC system, direct current station control system, line commutation current conversion station, line commutation current conversion station pole control system, voltage-source type current conversion station, electricity Potential source type current conversion station pole control system, DC line, the direct current station control system is controlled with the line commutation current conversion station pole respectively is System connects with the voltage-source type current conversion station pole control system, the line commutation current conversion station pole control system and the corresponding power network Commutation current conversion station connects, and the voltage-source type current conversion station pole control system connects with the corresponding voltage-source type current conversion station, described Line commutation current conversion station connects with the corresponding AC system, the voltage-source type current conversion station and the corresponding AC system Connection, the line commutation current conversion station, the voltage-source type current conversion station are connected to the AC line in parallel or serial fashion Lu Shang；
    Determine that the AC between the voltage-source type current conversion station and the corresponding AC system is coupled the parameter of transformer, institute State the parameter of power modules in voltage-source type current conversion station, the parameter of DC line and the multiterminal Hybrid HVDC system The parameter of median filter.
  3. 3. the failure response analysis method of multiterminal Hybrid HVDC system according to claim 1, it is characterised in that right The multiterminal Hybrid HVDC system establishes control strategy, including：
    Determine the control strategy of each current conversion station, wherein, the control strategy of the current conversion station for control DC current strategy or Control DC voltage strategy.
  4. 4. the failure response analysis method of multiterminal Hybrid HVDC system according to claim 1, it is characterised in that point The multiterminal Hybrid HVDC system is analysed under the control strategy, the multiterminal Hybrid HVDC system on AC failure Response characteristic, including：
    According to the control strategy of the multiterminal Hybrid HVDC system and the multiterminal Hybrid HVDC system, described in foundation When not occurring AC fault in multiterminal Hybrid HVDC system, the control characteristic curve of each current conversion station；
    According to the control strategy of the multiterminal Hybrid HVDC system and the multiterminal Hybrid HVDC system, described in foundation When AC fault occurs in current conversion station side described in any of which in multiterminal Hybrid HVDC system, the control of each current conversion station is special Linearity curve；
    During according to not occurring AC fault in the multiterminal Hybrid HVDC system, the control characteristic of each current conversion station is bent It is each described to change when AC fault occurs in current conversion station side described in any of which in line, and the multiterminal Hybrid HVDC system The control characteristic curve at station is flowed, current conversion station side described in any of which in the multiterminal Hybrid HVDC system is established and exchanges During failure, resonse characteristic of each current conversion station to AC fault.
  5. A kind of 5. failure response analysis system of multiterminal Hybrid HVDC system, it is characterised in that including：Build multiterminal mixing The multiterminal Hybrid HVDC system building platform of DC transmission system, control is established to the multiterminal Hybrid HVDC system The control strategy of strategy establishes platform and the analysis multiterminal Hybrid HVDC system is described more under the control strategy The failure response analysis platform of the response characteristic of Hybrid HVDC system on AC failure is held, wherein,
    The control strategy is established platform and is connected with the multiterminal Hybrid HVDC system building platform, the failure response point Analysis platform is established platform with the multiterminal Hybrid HVDC system building platform and the control strategy respectively and is connected.
  6. 6. the failure response analysis system of multiterminal Hybrid HVDC system according to claim 5, it is characterised in that institute State multiterminal Hybrid HVDC system building platform and build unit and parameter determination unit including topological structure, wherein,
    The topological structure builds the topological structure that unit builds the multiterminal Hybrid HVDC system, and the multiterminal mixing is straight Flowing transmission system includes AC system, direct current station control system, line commutation current conversion station, line commutation current conversion station pole control system, electricity Potential source type current conversion station, voltage-source type current conversion station pole control system, DC line, the direct current station control system are changed with the power network respectively Phase current conversion station pole control system connects with the voltage-source type current conversion station pole control system, the line commutation current conversion station pole control system with The corresponding line commutation current conversion station connection, the voltage-source type current conversion station pole control system change with the corresponding voltage-source type The connection of stream station, the line commutation current conversion station and corresponding AC system connection, the voltage-source type current conversion station with it is corresponding The AC system connection, the line commutation current conversion station, the voltage-source type current conversion station connect in parallel or serial fashion It is connected on the DC line；
    The parameter determination unit is built unit with the topological structure and is connected, and the parameter determination unit determines the voltage source AC between type current conversion station and the corresponding AC system is coupled in the parameter of transformer, the voltage-source type current conversion station The parameter of the parameter of power modules, the parameter of DC line and the multiterminal Hybrid HVDC system median filter.
  7. 7. the failure response analysis system of multiterminal Hybrid HVDC system according to claim 5, it is characterised in that institute Failure response analysis platform is stated including normal control characteristic curve establishes unit, Fault Control characteristic curve establishes unit and failure Resonse characteristic establishes unit；Wherein,
    The normal control characteristic curve establish unit respectively with the multiterminal Hybrid HVDC system building platform and described Control strategy establishes platform connection, and the normal control characteristic curve, which is established in the multiterminal Hybrid HVDC system, not to be occurred During AC fault, the control characteristic curve of each current conversion station；
    The Fault Control characteristic curve establish unit respectively with the multiterminal Hybrid HVDC system building platform and described Control strategy establishes platform connection, and the Fault Control characteristic curve, which is established in the multiterminal Hybrid HVDC system, wherein appoints When there is AC fault in one current conversion station, the control characteristic curve of each current conversion station；
    The fault response characteristics curve establishes unit and establishes unit and the failure with the normal control characteristic curve respectively Control characteristic curve establishes unit connection, and the fault response characteristics curve establishes unit and establishes the multiterminal Hybrid HVDC When there is AC fault in current conversion station described in any of which in system, resonse characteristic of each current conversion station to AC fault.
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CN110492519A (en) * 2019-08-19 2019-11-22 南方电网科学研究院有限责任公司 The VSC AC fault traversing method and device of extra-high voltage mixing MTDC transmission system
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