CN104022577A - Flexible DC transmission system converter station control protection method and structure - Google Patents
Flexible DC transmission system converter station control protection method and structure Download PDFInfo
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- CN104022577A CN104022577A CN201410279229.3A CN201410279229A CN104022577A CN 104022577 A CN104022577 A CN 104022577A CN 201410279229 A CN201410279229 A CN 201410279229A CN 104022577 A CN104022577 A CN 104022577A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
- Y04S10/40—Display of information, e.g. of data or controls
Abstract
The invention relates to a flexible DC transmission system converter station control protection method and structure. The method is characterized in that a control protection system of a flexible DC transmission converter station is set to be of a modularized, layered distribution type and open structure; specifically, the control protection system is divided into a system and converter station level control protection layer, a converter-level control protection layer and a valve-level and submodule-level control protection layer according to the functions of the three layers from high to low. The structure is characterized by comprising the system and converter station level control protection layer, the converter-level control protection layer and the valve-level and submodule-level control protection layer; the system and converter station level control protection layer is composed of a system-level control portion and a station-level control protection portion in a connecting mode; the converter-level control protection layer is composed of an inner ring current control unit, a phase locking synchronous link unit, a converter current-limiting control unit and a converter monitoring and protecting module; the valve-level and submodule-level control protection layer is divided into a plurality of valve-level and submodule-level control protection modules. The flexible DC transmission system converter station control protection method and structure have the advantages of breaking foreign technological monopoly and reducing construction cost.
Description
Technical field
The present invention relates to a kind of control guard method and structure of flexible DC power transmission system current conversion station, belong to flexible direct current and carry electricity and equipment technical field.
Background technology
It is a great problem during offshore wind farm is built that offshore wind farm electrical network is dissolved, flexible DC power transmission is all controlled alternating voltages of amplitude and phase place based on voltage source converter and pulse width modulating technology by direct voltage inversion, and can independently control fast transmitted active power and reactive power, greatly strengthen the flexibility of transmission of electricity, become the electric power transfer mode of being potential most of the stable connection realizing between Large Scale Wind Farm Integration and major network.
The flexible DC power transmission engineering having put into operation in the world at present is all divided into three layers according to structural stratification design principle by control protection system: operator control layer, control protective layer, interface layer.Wherein control protective layer and mainly comprise system-level control and converter level control system; system-level control system mainly realizes the function of control model conversion; the control of converter level is the core of controlling protective layer; mainly realize current closed-loop control, phase-locked and modulating wave generation, realize the quick defencive function of converter valve simultaneously.Flexible DC power transmission control system is a complicated multi-input multi-output system, in order to improve its reliability of operation, must limit the impact that arbitrary controlling unit fault causes.Can whether the structural design of the control protection system of flexible direct current converter station reliably concerns whole current conversion station safely, reliably and efficiently be moved.
The control protective layer of ABB technology path is that system-level control and converter control merge design at same main frame, and major function comprises functions such as receiving operations staff's instruction, active power control, Reactive Power Control, DC voltage control, alternating voltage control, sequential control, current closed-loop control, phase-locked control.Valve control equipment receives the instruction of the converter valve conducting of controlling protective layer transmission, controls the ON/OFF of converter valve.Can find out the synthetic main frame of system-level and converter level control by the hierarchy of ABB technology path.In the implementation process of engineering, must be instructed by the person in charge of the technology aspect of ABB AB, and can only carry out equipment purchase to ABB AB, have technology barriers, be unfavorable for carrying out competition.The control protection device requirement of flexible DC power transmission system increases day by day, can not be limited by external producer because of technical monopoly, affects construction investment and scientific research development.
The control protective layer of Siemens technique route is based on identical platform, and system-level control and the control of converter level divide two host design.Interface (operational order reception), sequence operation and the relevant ground interface to supervisory control system is responsible in irrespective of size control; The control of converter level realizes core control defencive function, comprises meritorious, idle control, reference voltage calculating, current/voltage balance etc.Can find out that by the hierarchy of Siemens technique route system-level and converter level control is divided into two main frames.But based on the design of identical platform, the technology of core rests on same equipment supply business equally.There is the shortcoming same with technology one.
Summary of the invention
One of object of the present invention, is the shortcoming that is limited by foreign producer for the control protection of existing flexible DC power transmission engineering, proposes a kind of control guard method of flexible DC power transmission system current conversion station.
Two of object of the present invention is the control protection structures for a kind of flexible DC power transmission system current conversion station is provided.This control protection structure is divided into system-level and the control of converter level two main frames and designs based on different platform; not only break the status of external producer technical monopoly; also the hierarchical Design structure of more clear division control protection system, improves the reliability of controlling protection.
One of object of the present invention can be by taking following technical scheme to reach:
A kind of control guard method of flexible DC power transmission system current conversion station, it is characterized in that: the control protection system of flexible DC power transmission current conversion station is arranged to modularization, layered distribution type and Open architecture, specifically described control protection system is divided into three levels, is followed successively by from high to low system and current conversion station level control protective layer, converter level control protective layer, valve level and submodule level control protective layer by its function;
1) system and current conversion station level control protective layer, open to the control centre of flexible DC power transmission system, meritorious, the idle instruction, system operation mode instruction and the on off control instruction that receive that the dispatching terminal SCADA of flexible DC power transmission system sends, and the instruction of sending according to receiving scheduling end SCADA issues control command to control protection and auxiliary system in station;
2) converter level control protective layer, open to system and current conversion station level control protective layer, the converter control mode instruction of accepting system and current conversion station level control protection, completes real power control, idle control and Current Control, generates the modulation wave signal of each converter valve control voltage;
3) valve level and submodule level control protective layer, open to converter level control protective layer, pulse generating signal, the control of the module capacitance balance of voltage, the control of brachium pontis circulation of valve level control protective layer control valve straton module switching, monitor and report to the monitoring unit of controlling protective layer to the state of submodule; Triggering, capacitance voltage that submodule control protective layer is realized submodule unit detect and submodule status monitoring, and information are returned to valve control unit, VCU.
One of object of the present invention can also be by taking following technical scheme to reach:
Further, current conversion station level and system-level control protective layer comprise following functional module:
1) data processing module, the input of data processing module connects the output of the MU merge cells of flexible DC power transmission system, and the output of data processing module connects the input of DC voltage control module, the meritorious input of Comprehensive Control module and the input of reactive comprehensive control module; Data processing unit mainly calculates following amount: three-phase alternating voltage positive sequence effective value, phase-splitting alternating voltage effective value amplitude and rate of change thereof, three-phase alternating current active power, three-phase alternating current reactive power;
2) control model is selected and is switched, and is responsible for management and coordination between various control models; The system operation mode that its input message is set by operations staff or state monitoring apparatus system judges;
3) meritorious class and idle class processing unit, complete meritorious and idle control, and control command is handed down to converter control layer.
Further; current conversion station level and system-level control protective layer are accepted and current conversion station level and system-level main control system are passed through in lower signalling; communicate by special optic fibre communication port with current conversion station level and the system-level control protective layer main frame of dispatching terminal and offside current conversion station; issue converter control mode instruction to converter level control protective layer; connect by optical-fibre channel between the two, communication protocol adopts IEC60044-8.
Further; the bridge of converter control protection structure current conversion station level and system-level control protective layer and valve level layer; the control of converter level controls to upper and system and station level that Function Coupling is tight, interactive signal is various, comprises various operational modes, operating instruction value, voltage, current switching signal, unblock instruction and state, the control of alternating current-direct current station signal, alternating current-direct current analog quantity and various protection actuating signal.
Further, between the system-level control of multiterminal flexible direct current and converter control increase station, coordinate signal.
Further, the control of converter level and valve level control interactive signal are less, mainly comprise that voltage reference signal/voltage modulated ripple, system are switched, trip signal.Valve control equipment is the interface layer of controlling protection system and converter valve, is directly determining conducting and the shutoff of converter valve.
Two of object of the present invention can be by taking following technical scheme to reach:
A control protection structure for flexible DC power transmission current conversion station, its design feature is: comprise system and current conversion station level control protective layer, converter level control protective layer, valve level and submodule level control protective layer;
System and current conversion station level control protective layer are controlled protection part by system-level control section and station level and are connected and composed, system-level control section is monitored by operational mode unit, control model unit, on off control unit, multi-terminal system level and coordinating control module forms, and the level of standing is controlled protection part by interchange field apparatus control unit, DC field device control cell, active power class control module, reactive power class control module, mode decision unit and current conversion station level monitoring and protection module composition;
Converter level control protective layer is by interior circular current control unit, Phase-Locked Synchronous link unit, converter Current limited Control unit and converter monitoring and protection module composition; Converter level control protective layer passes through I/O communication port with system and current conversion station level control protective layer and is connected with valve level and submodule level control protective layer by I/O communication port;
Valve level and submodule level control protective layer are divided into several valve levels and submodule level control protection module, and each valve level and submodule level control protection module are connected and composed by valve level control section and power model level control protection part; Valve level control section is made up of with protected location brachium pontis circulation control unit, converter switch modulation unit, capacitance voltage balance control unit, pulse distribution and trigger element and converter valve monitoring; Power model level control protection part is made up of two groups of Monitoring and Controlling structures, and every group of Monitoring and Controlling structure comprises power model trigger element, Bypass Control unit and Condition Monitoring Unit; Described power model trigger element, Bypass Control unit and Condition Monitoring Unit are by optical fiber connection valve level control section.
Two of object of the present invention can also be by taking following technical scheme to reach:
Further, multi-terminal system level monitors with coordinating control module and comprises MU merge cells, data processing unit and dispatching terminal SCADA, current conversion station level monitoring and protection module comprises the system-level control unit in offside station and I/O communication port, and mode decision unit comprises channel selecting unit and control model selection and switch unit; The input of the signal output part connection data processing unit of MU merge cells, data processing unit has three outputs, each output respectively connects the input of DC voltage control unit, the input of meritorious Comprehensive Control module, the input of reactive comprehensive module, meritorious Comprehensive Control module is active power class control module, and reactive comprehensive control module is reactive power class control module; The output of operational mode unit connects the input of reactive comprehensive control module and control model is selected and the input of switch unit; the output of the system-level control unit in offside station, the output of dispatching terminal SCADA are by the bus of channel selecting element connection system and current conversion station level control protective layer, and I/O communication port connects the input of control model selection and switch unit by the bus of system and current conversion station level control protective layer.
The present invention has following outstanding beneficial effect:
1, the control protection structure of the flexible DC power transmission current conversion station the present invention relates to, its system and station level are controlled protective layer, converter level control protective layer is the design based on different platform, the control protection system of flexible DC power transmission current conversion station is arranged to modularization, layered distribution type and Open architecture, specifically described control protection system is divided into three levels, be followed successively by from high to low system and current conversion station level control protective layer by its function, converter level control protective layer, valve level and submodule level control protective layer, there is the foreign technology of breaking monopolization, reduce the beneficial effect of project cost.
2, the control protection system the present invention relates to adopts modularization, layered distribution type, Open architecture.Soft and hardware structure and layering are optimized to design, and the load Distribution of assurance function and system each several part is reasonable, reliable, and independent between each subsystem, the coupled relation between each level reduces as far as possible, avoids the operation of certain a part of fault effects whole system.
3, it is clear that the interface of each level is protected in control of the present invention; three levels all can adopt different suppliers' product; each supplier can bring into play the advantage of certain one deck control protection, manufactures optimum equipment, and the reliability of the control protection of flexible direct current converter station is provided.
Brief description of the drawings
Fig. 1 is the control protection structural representation of flexible DC power transmission current conversion station.
Fig. 2 is system-level and current conversion station level control protective layer structure schematic diagram.
Fig. 3 is the schematic diagram that contacts of the converter control protective layer that the present invention relates to and each layer.
Embodiment
Specific embodiment 1:
See figures.1.and.2, the control protection structure of the flexible DC power transmission current conversion station that the present embodiment relates to, comprises system and current conversion station level control protective layer, converter level control protective layer, valve level and submodule level control protective layer; System and current conversion station level control protective layer are controlled protection part by system-level control section and station level and are connected and composed, system-level control section is monitored by operational mode unit, control model unit, on off control unit, multi-terminal system level and coordinating control module forms, and the level of standing is controlled protection part by interchange field apparatus control unit, DC field device control cell, active power class control module, reactive power class control module, mode decision unit and current conversion station level monitoring and protection module composition; Converter level control protective layer is by interior circular current control unit, Phase-Locked Synchronous link unit, converter Current limited Control unit and converter monitoring and protection module composition; Converter level control protective layer passes through I/O communication port with system and current conversion station level control protective layer and is connected with valve level and submodule level control protective layer by I/O communication port; Valve level and submodule level control protective layer are divided into several valve levels and submodule level control protection module, and each valve level and submodule level control protection module are connected and composed by valve level control section and power model level control protection part; Valve level control section is made up of with protected location brachium pontis circulation control unit, converter switch modulation unit, capacitance voltage balance control unit, pulse distribution and trigger element and converter valve monitoring; Power model level control protection part is made up of two groups of Monitoring and Controlling structures, and every group of Monitoring and Controlling structure comprises power model trigger element, Bypass Control unit and Condition Monitoring Unit; Described power model trigger element, Bypass Control unit and Condition Monitoring Unit are by optical fiber connection valve level control section.
In the present embodiment: multi-terminal system level monitors with coordinating control module and comprises MU merge cells, data processing unit and dispatching terminal SCADA, current conversion station level monitoring and protection module comprises the system-level control unit in offside station and I/O communication port, and mode decision unit comprises channel selecting unit and control model selection and switch unit; The input of the signal output part connection data processing unit of MU merge cells, data processing unit has three outputs, each output respectively connects the input of DC voltage control unit, the input of meritorious Comprehensive Control module, the input of reactive comprehensive module, meritorious Comprehensive Control module is active power class control module, and reactive comprehensive control module is reactive power class control module; The output of operational mode unit connects the input of reactive comprehensive control module and control model is selected and the input of switch unit; the output of the system-level control unit in offside station, the output of dispatching terminal SCADA are by the bus of channel selecting element connection system and current conversion station level control protective layer, and I/O communication port connects the input of control model selection and switch unit by the bus of system and current conversion station level control protective layer.
Operational mode unit, control model unit and on off control unit are made up of the functional circuit of routine techniques, multi-terminal system level monitors and the have Multi-channel monitoring of coordinating control module by routine techniques, the circuit of adjusting and control function forms, exchange field apparatus control unit, DC field device control cell is by conventional alternating current equipment control circuit, DC equipment control circuit forms, active power class control module, reactive power class control module is by the active power control circuit of routine techniques, Reactive Power Control circuit forms, mode decision unit and current conversion station level monitoring and protection module are made up of mode selection circuit and the current conversion station monitoring and controlling circuit of routine techniques, interior circular current control unit, Phase-Locked Synchronous link unit, converter Current limited Control unit are made up of loop current control circuit, Phase-locked Synchronous Circuit and the converter current-limiting control circuit of routine techniques respectively, converter monitoring and protection module is made up of the custom circuit with supervision and defencive function, brachium pontis circulation control unit, converter switch modulation unit, capacitance voltage balance control unit, pulse distribution and trigger element are made up of brachium pontis circulation control circuit, converter switch modulation circuit, capacitance voltage balance control circuit, pulse distribution and the circuits for triggering of routine techniques respectively, and converter valve monitoring is made up of with the circuit of defencive function the switch valve monitoring that has of routine techniques with protected location, power model trigger element, Bypass Control unit and Condition Monitoring Unit are made up of power model circuits for triggering, bypass control circuit and the status monitoring circuit of routine techniques respectively.
The control guard method of the flexible DC power transmission system current conversion station that the present embodiment relates to, it is characterized in that: the control protection system of flexible DC power transmission current conversion station is arranged to modularization, layered distribution type and Open architecture, specifically described control protection system is divided into three levels, is followed successively by from high to low system and current conversion station level control protective layer, converter level control protective layer, valve level and submodule level control protective layer by its function;
1) system and current conversion station level control protective layer, open to the control centre of flexible DC power transmission system, meritorious, the idle instruction, system operation mode instruction and the on off control instruction that receive that the dispatching terminal SCADA of flexible DC power transmission system sends, and the instruction of sending according to receiving scheduling end SCADA issues control command to control protection and auxiliary system in station;
2) converter level control protective layer, open to system and current conversion station level control protective layer, the converter control mode instruction of accepting system and current conversion station level control protection, completes real power control, idle control and Current Control, generates the modulation wave signal of each converter valve control voltage;
3) valve level and submodule level control protective layer, open to converter level control protective layer, pulse generating signal, the control of the module capacitance balance of voltage, the control of brachium pontis circulation of valve level control protective layer control valve straton module switching, monitor and report to the monitoring unit of controlling protective layer to the state of submodule; Triggering, capacitance voltage that submodule control protective layer is realized submodule unit detect and submodule status monitoring, and information are returned to valve control unit, VCU.
Further, current conversion station level and system-level control protective layer comprise following functional module:
1) data processing module, the input of data processing module connects the output of the MU merge cells of flexible DC power transmission system, and the output of data processing module connects the input of DC voltage control module, the meritorious input of Comprehensive Control module and the input of reactive comprehensive control module; Data processing unit mainly calculates following amount: three-phase alternating voltage positive sequence effective value, phase-splitting alternating voltage effective value amplitude and rate of change thereof, three-phase alternating current active power, three-phase alternating current reactive power;
2) control model is selected and is switched, and is responsible for management and coordination between various control models; The system operation mode that its input message is set by operations staff or state monitoring apparatus system judges;
3) meritorious class and idle class processing unit, complete meritorious and idle control, and control command is handed down to converter control layer.
Further; current conversion station level and system-level control protective layer are accepted and current conversion station level and system-level main control system are passed through in lower signalling; communicate by special optic fibre communication port with current conversion station level and the system-level control protective layer main frame of dispatching terminal and offside current conversion station; issue converter control mode instruction to converter level control protective layer; connect by optical-fibre channel between the two, communication protocol adopts IEC60044-8.
Further; the bridge of converter control protection structure current conversion station level and system-level control protective layer and valve level layer; the control of converter level controls to upper and system and station level that Function Coupling is tight, interactive signal is various, comprises various operational modes, operating instruction value, voltage, current switching signal, unblock instruction and state, the control of alternating current-direct current station signal, alternating current-direct current analog quantity and various protection actuating signal.
Further, between the system-level control of multiterminal flexible direct current and converter control increase station, coordinate signal.
Further, the control of converter level and valve level control interactive signal are less, mainly comprise that voltage reference signal/voltage modulated ripple, system are switched, trip signal.Valve control equipment is the interface layer of controlling protection system and converter valve, is directly determining conducting and the shutoff of converter valve.
The present invention by a system, core control and on the spot interface connect and compose the control protection system structure of soft straight current conversion station; the layer of structure of the layering forming is few; adopt between layers communication protocol and interface at a high speed, improve precision and the speed of controlling protection.
Claims (8)
1. the control guard method of a flexible DC power transmission system current conversion station, it is characterized in that: the control protection system of flexible DC power transmission current conversion station is arranged to modularization, layered distribution type and Open architecture, specifically described control protection system is divided into three levels, is followed successively by from high to low system and current conversion station level control protective layer, converter level control protective layer, valve level and submodule level control protective layer by its function;
1) system and current conversion station level control protective layer, open to the control centre of flexible DC power transmission system, meritorious, the idle instruction, system operation mode instruction and the on off control instruction that receive that the dispatching terminal SCADA of flexible DC power transmission system sends, and the instruction of sending according to receiving scheduling end SCADA issues control command to control protection and auxiliary system in station;
2) converter level control protective layer, open to system and current conversion station level control protective layer, the converter control mode instruction of accepting system and current conversion station level control protection, completes real power control, idle control and Current Control, generates the modulation wave signal of each converter valve control voltage;
3) valve level and submodule level control protective layer, open to converter level control protective layer, pulse generating signal, the control of the module capacitance balance of voltage, the control of brachium pontis circulation of valve level control protective layer control valve straton module switching, monitor and report to the monitoring unit of controlling protective layer to the state of submodule; Triggering, capacitance voltage that submodule control protective layer is realized submodule unit detect and submodule status monitoring, and information are returned to valve control unit, VCU.
2. the control guard method of a kind of flexible DC power transmission system current conversion station according to claim 1, is characterized in that: current conversion station level and system-level control protective layer comprise following functional module:
1) data processing module, the input of data processing module connects the output of the MU merge cells of flexible DC power transmission system, and the output of data processing module connects the input of DC voltage control module, the meritorious input of Comprehensive Control module and the input of reactive comprehensive control module; Data processing unit mainly calculates following amount: three-phase alternating voltage positive sequence effective value, phase-splitting alternating voltage effective value amplitude and rate of change thereof, three-phase alternating current active power, three-phase alternating current reactive power;
2) control model is selected and is switched, and is responsible for management and coordination between various control models; The system operation mode that its input message is set by operations staff or state monitoring apparatus system judges;
3) meritorious class and idle class processing unit, complete meritorious and idle control, and control command is handed down to converter control layer.
3. the control guard method of a kind of flexible DC power transmission system current conversion station according to claim 2; it is characterized in that: current conversion station level and system-level control protective layer are accepted and current conversion station level and system-level main control system are passed through in lower signalling; communicate by special optic fibre communication port with current conversion station level and the system-level control protective layer main frame of dispatching terminal and offside current conversion station; issue converter control mode instruction to converter level control protective layer; connect by optical-fibre channel between the two, communication protocol adopts IEC60044-8.
4. the control guard method of a kind of flexible DC power transmission system current conversion station according to claim 2; it is characterized in that: the bridge of converter control protection structure current conversion station level and system-level control protective layer and valve level layer; the control of converter level controls to upper and system and station level that Function Coupling is tight, interactive signal is various, comprises various operational modes, operating instruction value, voltage, current switching signal, unblock instruction and state, the control of alternating current-direct current station signal, alternating current-direct current analog quantity and various protection actuating signal.
5. the control guard method of a kind of flexible DC power transmission system current conversion station according to claim 2, is characterized in that: the system-level control of multiterminal flexible direct current and converter control increase between station coordinates signal.
6. the control guard method of a kind of flexible DC power transmission system current conversion station according to claim 1; it is characterized in that: the control of converter level and valve level control interactive signal are less; mainly comprise that voltage reference signal/voltage modulated ripple, system are switched, trip signal; valve control equipment is the interface layer of controlling protection system and converter valve, is directly determining conducting and the shutoff of converter valve.
7. the control of a flexible DC power transmission current conversion station protection structure, is characterized in that: comprise system and current conversion station level control protective layer, converter level control protective layer, valve level and submodule level control protective layer;
System and current conversion station level control protective layer are controlled protection part by system-level control section and station level and are connected and composed, system-level control section is monitored by operational mode unit, control model unit, on off control unit, multi-terminal system level and coordinating control module forms, and the level of standing is controlled protection part by interchange field apparatus control unit, DC field device control cell, active power class control module, reactive power class control module, mode decision unit and current conversion station level monitoring and protection module composition;
Converter level control protective layer is by interior circular current control unit, Phase-Locked Synchronous link unit, converter Current limited Control unit and converter monitoring and protection module composition; Converter level control protective layer passes through I/O communication port with system and current conversion station level control protective layer and is connected with valve level and submodule level control protective layer by I/O communication port;
Valve level and submodule level control protective layer are divided into several valve levels and submodule level control protection module, and each valve level and submodule level control protection module are connected and composed by valve level control section and power model level control protection part; Valve level control section is made up of with protected location brachium pontis circulation control unit, converter switch modulation unit, capacitance voltage balance control unit, pulse distribution and trigger element and converter valve monitoring; Power model level control protection part is made up of two groups of Monitoring and Controlling structures, and every group of Monitoring and Controlling structure comprises power model trigger element, Bypass Control unit and Condition Monitoring Unit; Described power model trigger element, Bypass Control unit and Condition Monitoring Unit are by optical fiber connection valve level control section.
8. the control of a kind of flexible DC power transmission system current conversion station according to claim 7 protection structure, it is characterized in that: multi-terminal system level monitors with coordinating control module and comprises MU merge cells, data processing unit and dispatching terminal SCADA, current conversion station level monitoring and protection module comprises the system-level control unit in offside station and I/O communication port, and mode decision unit comprises channel selecting unit and control model selection and switch unit; The input of the signal output part connection data processing unit of MU merge cells, data processing unit has three outputs, each output respectively connects the input of DC voltage control unit, the input of meritorious Comprehensive Control module, the input of reactive comprehensive module, meritorious Comprehensive Control module is active power class control module, and reactive comprehensive control module is reactive power class control module; The output of operational mode unit connects the input of reactive comprehensive control module and control model is selected and the input of switch unit; the output of the system-level control unit in offside station, the output of dispatching terminal SCADA are by the bus of channel selecting element connection system and current conversion station level control protective layer, and I/O communication port connects the input of control model selection and switch unit by the bus of system and current conversion station level control protective layer.
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| CN104779626A (en) * | 2015-03-26 | 2015-07-15 | 中国南方电网有限责任公司超高压输电公司广州局 | Monitoring method for reactive power control of extra-high/ultrahigh-voltage direct-current convertor station |
| CN104809340A (en) * | 2015-04-23 | 2015-07-29 | 国家电网公司 | Method for quickly calculating operating point of multi-end flexible direct-current power transmission system |
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| CN109030971A (en) * | 2018-04-12 | 2018-12-18 | 广东电网有限责任公司 | A kind of method that flexible direct current FT3 message template library is formed |
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| CN108933434A (en) * | 2018-07-26 | 2018-12-04 | 云南电网有限责任公司电力科学研究院 | A kind of flexible direct current transmission converter station failure current limit protection system and method |
| CN110021950A (en) * | 2019-03-25 | 2019-07-16 | 北京四方继保自动化股份有限公司 | A kind of soft straight distribution densification control protected host |
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| CN110165696A (en) * | 2019-05-30 | 2019-08-23 | 南方电网科学研究院有限责任公司 | A kind of three end HVDC transmission systems |
| CN110391669A (en) * | 2019-07-24 | 2019-10-29 | 国网冀北电力有限公司检修分公司 | A kind of change of current valve control system |
| CN111313387A (en) * | 2020-03-31 | 2020-06-19 | 全球能源互联网研究院有限公司 | Flexible direct-current power grid layered architecture control protection system and protection method |
| CN111313387B (en) * | 2020-03-31 | 2022-03-15 | 全球能源互联网研究院有限公司 | Flexible direct-current power grid layered architecture control protection system and protection method |
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