CN113452059A - Offshore wind power direct current sending-out system with direct current energy consumption function and control method - Google Patents
Offshore wind power direct current sending-out system with direct current energy consumption function and control method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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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
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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Abstract
An offshore wind power direct current sending-out system with direct current energy consumption function and a control method thereof are disclosed, the system comprises a step-up transformer, a connecting transformer, an offshore converter station and an onshore converter station which are connected in sequence; the direct current energy consumption equipment is arranged between polar lines of the onshore converter station. The method comprises the steps of monitoring direct current between a positive electrode line and a negative electrode line, controlling the direct current energy consumption equipment to be gradually put into the equipment according to the proportion when the direct current value rises to reach a threshold value, controlling the direct current energy consumption equipment to be gradually cut off according to the proportion when the direct current value drops to reach the threshold value, and preventing the direct current value from exceeding a direct current overvoltage protection fixed value in the process. The invention provides a method for integrating a direct current energy consumption protection function into a direct current protection system and matching direct current energy consumption and direct current overvoltage protection, so that the direct current energy consumption equipment is safe and usable, and the reliability of an offshore wind power direct current output system is ensured.
Description
Technical Field
The invention relates to the technical field of offshore wind power, in particular to an offshore wind power direct current sending-out system with a direct current energy consumption function and a control method.
Background
The offshore wind power is widely applied to Europe, particularly Germany, the flexible direct current transmission technology in China starts late but develops quickly, the maximum power transmission scale flexible direct current project which is put into operation at present is +/-420 kV/1250MW Yu Hubei back-to-back networking project, the built Udongde ultrahigh voltage mixed multi-end direct current project flexible direct current transmission scale reaches +/-800 kV/5000MW and is in the world leading level. The offshore wind power transmission system has a certain technical foundation by adopting flexible direct current transmission, and the offshore wind power flexible direct current transmission system adopting a direct current energy consumption equipment topological mode has alternating current fault ride-through capability and higher reliability, and if the protection function configuration of direct current energy consumption equipment is unreasonable or the logic of the protection function matching with the direct current protection function is incorrect, the system is abnormally locked, and the reliability of the system is reduced.
Disclosure of Invention
The invention aims to provide an offshore wind power direct current sending-out system with a direct current energy consumption function and a control method thereof.
In order to achieve the above object, a first aspect of the present invention provides an offshore wind power direct current output system with direct current energy consumption function, comprising: the system comprises a step-up transformer, a connecting transformer, an offshore converter station and an onshore converter station;
the offshore wind power is connected to an offshore converter station through the step-up transformer and the connecting transformer, the alternating current is converted into direct current, the direct current is connected to the onshore converter station through a submarine cable, and the direct current is connected to an alternating current power grid after being converted into alternating current;
the direct current energy consumption equipment is arranged between the polar lines of the onshore converter stations.
Further, the direct current energy consumption device comprises an energy consumption resistor and a plurality of switch modules which are connected in series.
Further, the energy consumption resistor comprises one or more; the plurality of energy dissipation resistors are arranged among the plurality of switch modules in a centralized manner or in a separated manner.
Further, the protection zone of the land converter station is divided into: the system comprises a direct current energy consumption protection area, a valve side alternating current connecting line protection area, a converter protection area, an electrode protection area and a direct current line protection area;
the direct current energy consumption protection area is an area between the positive electrode current IDCCP and the negative electrode current IDCCN of the energy consumption device;
the valve side alternating current connecting line protection area is an area between the converter transformer valve side sleeve current IVD and the starting resistor valve side current IVC;
the converter protection area is an area among starting resistance valve side current IVC, positive pole line outlet current IDP and negative pole line outlet current IDN;
the pole protection region is a region between the positive pole line outlet current IDP, the negative pole line outlet current IDN, the positive pole line current IDLP and the negative pole line current IDLN;
the direct-current line protection area is an area among a positive line current IDLP, a negative line current IDLN, a station-to-station positive line current IDLP _ OS and a station-to-station negative line current IDLN _ OS;
and each protection area is configured with a corresponding protection function to realize the protection of equipment or the detection of various faults in the area, and the direct current energy consumption protection area and each protection area are integrated into a direct current protection system.
Further, the valve side alternating current connecting line protection area is provided with valve side alternating current connecting line differential protection, starting resistance overcurrent protection, starting resistance overload protection, valve side alternating current connecting line busbar differential protection, valve side alternating current connecting line overcurrent protection, grounding resistor overload protection, grounding resistance overcurrent protection, grounding resistance overload protection and valve side zero sequence overvoltage protection;
the converter protection area is provided with bridge arm differential protection, bridge arm overcurrent protection, bridge arm reactor differential protection and high-frequency harmonic protection;
the pole protection area is provided with direct current overvoltage protection, direct current pole bus differential protection, direct current voltage unbalance protection, direct current low voltage protection and converter differential protection;
the direct current line protection area is configured with traveling wave protection, voltage sudden change protection, direct current line differential protection and/or direct current line low voltage protection.
Furthermore, the direct current energy consumption protection area is provided with direct current energy consumption differential protection, overcurrent protection and resistor overload protection.
Further, the direct current energy consumption differential protection criterion is as follows: i IDCCP-IDCCN | > Max (Isc _ set, k _ set × Ires); the braking current Ires is max (| IDCCP |, | IDCCN |), k _ set is a proportionality coefficient, and Isc _ set is a protection action starting fixed value;
the overcurrent protection criterion is as follows: the delta is a current fixed value;
the resistance overload protection adopts the criterion of an inverse time-limit characteristic curve as follows:
t is the time that the resistor can bear when different currents flow, tau is the time constant of resistor heat dissipation, IeqIs the continuous current capacity of the resistor, I∞Is the effective value of the current flowing through the resistor.
The second aspect of the present invention provides a control method for an offshore wind power direct current output system with a direct current energy consumption function, which is used for controlling the offshore wind power direct current output system, and comprises the following steps:
setting a first threshold voltage U1 and a second threshold voltage U2, U1 < U2;
monitoring the direct current voltage U between the positive wire and the negative wire in real time;
comparing the magnitude of the dc voltage U with the first threshold voltage U1:
when the dc voltage reaches U — U1 during the rise period, the STATE of the activation signal "STATE" changes to 1 as time T0; recording the transmission delay delta T1 as a time T1, and controlling a plurality of switch modules in the direct current energy consumption equipment to be gradually put into operation according to a proportion; after transmission delay delta T2, recording as time T2, the direct current voltage U begins to decline; and when the value of the direct current voltage U is reduced to U1 after the voltage is delta T3, the time is recorded as a time T3, the starting signal 'STATE' is changed to 0, and the plurality of switch modules in the direct current energy consumption equipment are controlled to be cut off step by step according to the proportion.
Further, the second threshold voltage U2 is a fixed value of dc overvoltage protection; the first threshold voltage U1 is set so that the value of the dc voltage U at the time T2 when it starts to fall is U2 or less.
In summary, the present invention provides an offshore wind power dc transmission system with dc energy consumption function and a control method thereof, wherein the system includes a step-up transformer, a connection transformer, an offshore converter station and a onshore converter station, which are connected in sequence; the direct current energy consumption equipment is arranged between polar lines of the onshore converter station. The method comprises the steps of monitoring direct current between a positive electrode line and a negative electrode line, controlling the direct current energy consumption equipment to be gradually put into the equipment according to the proportion when the direct current value rises to reach a threshold value, controlling the direct current energy consumption equipment to be gradually cut off according to the proportion when the direct current value drops to reach the threshold value, and preventing the direct current value from exceeding a direct current overvoltage protection fixed value in the process.
The invention provides a method for integrating a direct current energy consumption protection function into a direct current protection system and matching direct current energy consumption and direct current overvoltage protection, so that the direct current energy consumption equipment is safe and usable, and the reliability of an offshore wind power direct current output system is ensured.
Drawings
FIG. 1 is an electrical schematic diagram of an offshore wind power DC delivery system with DC energy consuming equipment according to an embodiment of the present invention;
FIG. 2 is a block diagram of a land converter station protection zone of an embodiment of the present invention;
fig. 3 is a schematic diagram of a dc energy consuming device according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of a control method of the offshore wind power direct current delivery system according to the embodiment of the invention;
FIG. 5 is a waveform diagram of DC voltage and STATE over time for an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Fig. 1 is a schematic diagram of an offshore wind power direct current output system provided by an embodiment of the invention. The invention provides an offshore wind power direct current sending-out system with a direct current energy consumption function.
Referring to fig. 1, the offshore wind power direct current transmission system with the direct current energy consumption function includes a step-up transformer, a connection transformer, an offshore converter station and an onshore converter station, wherein offshore wind power is connected to the offshore converter station through the step-up transformer and the connection transformer to convert alternating current into direct current, the offshore wind power is connected to the onshore converter station through a submarine cable to convert the direct current into alternating current and then to an alternating current power grid, and direct current energy consumption equipment is arranged between direct current polar lines of the onshore converter station.
Fig. 2 is a block diagram of a land based converter station protection zone.
Further, referring to fig. 2, the present invention provides a method for configuring and coordinating the direct current energy consumption protection and the direct current protection function of the offshore wind power direct current transmission system, and proposes a control function hierarchy as shown in fig. 2, and proposes a protection partition of a onshore converter station as: the system comprises a direct current energy consumption protection area, a valve side alternating current connecting line protection area, a converter protection area, an electrode protection area and a direct current line protection area. The direct current energy consumption protection area is an area between the positive pole current IDCCP and the negative pole current IDCCN of the energy consumption device, and is configured with direct current energy consumption differential protection, overcurrent protection and resistor overload protection functions; the valve side alternating current connecting line protection area is an area between a converter transformer valve side sleeve current IVD and a starting resistor valve side current IVC, and is provided with valve side alternating current connecting line differential protection, starting resistor overcurrent protection, starting resistor overload protection, valve side alternating current connecting line busbar differential protection, valve side alternating current connecting line overcurrent protection, grounding reactor overload protection, grounding resistor overcurrent protection, grounding resistor overload protection and valve side zero sequence overvoltage protection functions; the converter protection area is an area among a starting resistance valve side current IVC, a positive pole line outlet current IDP and a negative pole line outlet current IDN, and is configured with functions of bridge arm differential protection, bridge arm overcurrent protection, bridge arm reactor differential protection and high-frequency harmonic protection; the pole protection area is an area among a positive pole line outlet current IDP, a negative pole line outlet current IDN, a positive pole line current IDLP and a negative pole line current IDLN, and is configured with functions of direct current overvoltage protection, direct current pole bus differential protection, direct current voltage unbalance protection, direct current low voltage protection and current converter differential protection; the direct current line protection area is an area between the positive line current IDLP, the negative line current IDLN, the station positive line current IDLP _ OS and the station negative line current IDLN _ OS, and is provided with traveling wave protection (matching), voltage abrupt change protection (matching), direct current line differential protection and direct current line low voltage protection functions. And each protection area is configured with a corresponding protection function to realize the protection of equipment or the detection of various faults in the area, and the direct current energy consumption protection area and each protection area are integrated into a direct current protection system.
The direct current energy consumption protection area is provided with direct current energy consumption differential protection, overcurrent protection and resistance overload protection functions, and the direct current energy consumption differential protection criterion is as follows: the braking current Ires is Max (| IDCCP |, | IDCCN |), k _ set is a proportionality coefficient, and typically 0.12, and Isc _ set is a protection action start fixed value, and typically 0.1 pu.
The overcurrent protection criterion is as follows: i IDCCP i > Δ or i IDCCN i > Δ, Δ is a constant value, typically 1.2 pu. Delta is a symbol and is a current value, the unit pu represents a per unit value of the rated current, namely, the rated current corresponds to 1pu, the rated current value of each project is different, and the per unit value is more universal.
The resistance overload protection adopts the criterion of an inverse time-limit characteristic curve as follows:
t is the time that the resistor can bear when different currents flow, tau is the time constant of resistor heat dissipation, IeqIs the continuous current capacity of the resistor, I∞Is the effective value of the current flowing through the resistor.
The topological structure of the direct current energy consumption equipment of the offshore wind power direct current sending-out system is shown in fig. 3.
Fig. 3 is a schematic diagram of a dc energy consumption device according to an embodiment of the present invention.
Referring to fig. 3, the dc energy consumption device includes an energy consumption resistor assembly and a plurality of switch modules connected in series, where the energy consumption resistor assembly includes one or more energy consumption resistors. Optionally, the plurality of energy dissipation resistors may be arranged in a centralized manner, or may be arranged in a distributed manner, and the energy dissipation resistors are arranged between the plurality of switch modules connected in series in the distributed manner. The switch module at least includes two states of switching on or switching off, at least includes a capacitor and one or more switching devices connected in series with the capacitor, and may be a half-bridge sub-module or a full-bridge sub-module. The direct current energy consumption equipment is controlled by the sub-module to realize the input and the cut-off of the direct current energy consumption equipment. When the direct current energy consumption equipment is cut off, the output voltage of a sub module of the direct current energy consumption equipment is a rated value, and the current flowing through an energy consumption resistor is 0; when the direct current energy consumption equipment is put into operation, the output voltage of the sub-module of the direct current energy consumption equipment is 0, and the current flowing through the energy consumption resistor is a rated value.
A second aspect of the present invention provides a method for controlling an offshore wind power dc transmission system with dc energy consumption function, as shown in fig. 4, including the following steps:
step S100, setting a first threshold voltage U1 and a second threshold voltage U2, wherein U1 is less than U2;
step S200, monitoring the dc voltage U between the positive line and the negative line in real time, i.e. U ═ UDP-UDN；
And step S300, comparing the direct current voltage U with a first threshold voltage U1, and controlling the starting and the cutting of the direct current energy consumption equipment according to the comparison result.
Specifically, as shown in fig. 5, when the dc voltage reaches U — U1 during the rise period, the STATE of the activation signal "STATE" becomes 1 at time T0; recording the transmission delay delta T1 as a time T1, and controlling a plurality of switch modules in the direct current energy consumption equipment to be gradually put into operation according to a proportion; after transmission delay delta T2, recording as time T2, the direct current voltage U begins to decline; and when the value of the direct current voltage U is reduced to U1 after the voltage is delta T3, the time is recorded as a time T3, the starting signal 'STATE' is changed to 0, and the plurality of switch modules in the direct current energy consumption equipment are controlled to be cut off step by step according to the proportion.
Further, the second threshold voltage U2 is a dc overvoltage protection fixed value; the first threshold voltage U1 is set, so that the value of the direct current voltage U when the direct current voltage U starts to fall at the time T2 is smaller than or equal to U2, the misoperation of direct current overvoltage protection is avoided, the direct current energy consumption equipment is safely usable, and the reliability of the offshore wind power direct current sending-out system is ensured. Namely, the offshore wind power direct current sending-out system realizes the mutual matching of the direct current energy consumption protection and the direct current protection function.
In summary, the present invention provides an offshore wind power dc transmission system with dc energy consumption function and a control method thereof, wherein the system includes a step-up transformer, a connection transformer, an offshore converter station and a onshore converter station, which are connected in sequence; the direct current energy consumption equipment is arranged between polar lines of the onshore converter station. The method comprises the steps of monitoring direct current between a positive electrode line and a negative electrode line, controlling the direct current energy consumption equipment to be gradually put into the equipment according to the proportion when the direct current value rises to reach a threshold value, controlling the direct current energy consumption equipment to be gradually cut off according to the proportion when the direct current value drops to reach the threshold value, and preventing the direct current value from exceeding a direct current overvoltage protection fixed value in the process. The invention provides a method for integrating a direct current energy consumption protection function into a direct current protection system and matching direct current energy consumption and direct current overvoltage protection, so that the direct current energy consumption equipment is safe and usable, and the reliability of an offshore wind power direct current output system is ensured.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (9)
1. An offshore wind power direct current sending-out system with direct current energy consumption function is characterized by comprising: the system comprises a step-up transformer, a connecting transformer, an offshore converter station and an onshore converter station;
the offshore wind power is connected to an offshore converter station through the step-up transformer and the connecting transformer, the alternating current is converted into direct current, the direct current is connected to the onshore converter station through a submarine cable, and the direct current is connected to an alternating current power grid after being converted into alternating current;
the direct current energy consumption equipment is arranged between the polar lines of the onshore converter stations.
2. Offshore wind power direct current takeoff system according to claim 1, characterized in that said direct current energy consuming device comprises a plurality of switch modules and an energy consuming resistor connected in series.
3. The offshore wind power direct current export system of claim 2, wherein said energy consuming resistors comprise one or more; the plurality of energy dissipation resistors are arranged among the plurality of switch modules in a centralized manner or in a separated manner.
4. Offshore wind power direct current takeoff system according to any of claims 1 to 3, characterized in that the protection zone of said onshore converter station is divided into: the system comprises a direct current energy consumption protection area, a valve side alternating current connecting line protection area, a converter protection area, an electrode protection area and a direct current line protection area;
the direct current energy consumption protection area is an area between the positive electrode current IDCCP and the negative electrode current IDCCN of the energy consumption device;
the valve side alternating current connecting line protection area is an area between the converter transformer valve side sleeve current IVD and the starting resistor valve side current IVC;
the converter protection area is an area among starting resistance valve side current IVC, positive pole line outlet current IDP and negative pole line outlet current IDN;
the pole protection region is a region between the positive pole line outlet current IDP, the negative pole line outlet current IDN, the positive pole line current IDLP and the negative pole line current IDLN;
the direct-current line protection area is an area among a positive line current IDLP, a negative line current IDLN, a station-to-station positive line current IDLP _ OS and a station-to-station negative line current IDLN _ OS;
and each protection area is configured with a corresponding protection function to realize the protection of equipment or the detection of various faults in the area, and the direct current energy consumption protection area and each protection area are integrated into a direct current protection system.
5. Offshore wind power direct current bringing out system according to claim 4,
the valve side alternating current connecting line protection area is provided with valve side alternating current connecting line differential protection, starting resistance overcurrent protection, starting resistance overload protection, valve side alternating current connecting line busbar differential protection, valve side alternating current connecting line overcurrent protection, grounding reactor overload protection, grounding resistance overcurrent protection, grounding resistance overload protection and valve side zero sequence overvoltage protection;
the converter protection area is provided with bridge arm differential protection, bridge arm overcurrent protection, bridge arm reactor differential protection and high-frequency harmonic protection;
the pole protection area is provided with direct current overvoltage protection, direct current pole bus differential protection, direct current voltage unbalance protection, direct current low voltage protection and converter differential protection;
the direct current line protection area is configured with traveling wave protection, voltage sudden change protection, direct current line differential protection and/or direct current line low voltage protection.
6. The offshore wind power direct current export system of claim 4, wherein the direct current energy consumption protection zone is configured with direct current energy consumption differential protection, overcurrent protection and resistor overload protection.
7. Offshore wind power direct current bringing out system according to claim 6,
the direct current energy consumption differential protection criterion is as follows: i IDCCP-IDCCN | > Max (Isc _ set, k _ set × Ires); the braking current Ires is max (| IDCCP |, | IDCCN |), k _ set is a proportionality coefficient, and Isc _ set is a protection action starting fixed value;
the overcurrent protection criterion is as follows: the delta is a current fixed value;
the resistance overload protection adopts the criterion of an inverse time-limit characteristic curve as follows:
t is the time that the resistor can bear when different currents flow, tau is the time constant of resistor heat dissipation, IeqIs the continuous current capacity of the resistor, I∞Is the effective value of the current flowing through the resistor.
8. A control method of an offshore wind power direct current export system with direct current energy consumption function, characterized in that, the method is used for controlling the offshore wind power direct current export system as claimed in any one of claims 1-5, and comprises the following steps:
setting a first threshold voltage U1 and a second threshold voltage U2, U1 < U2;
monitoring the direct current voltage U between the positive wire and the negative wire in real time;
comparing the magnitude of the dc voltage U with the first threshold voltage U1:
when the dc voltage reaches U — U1 during the rise period, the STATE of the activation signal "STATE" changes to 1 as time T0; recording the transmission delay delta T1 as a time T1, and controlling a plurality of switch modules in the direct current energy consumption equipment to be gradually put into operation according to a proportion; after transmission delay delta T2, recording as time T2, the direct current voltage U begins to decline; and when the value of the direct current voltage U is reduced to U1 after the voltage is delta T3, the time is recorded as a time T3, the starting signal 'STATE' is changed to 0, and the plurality of switch modules in the direct current energy consumption equipment are controlled to be cut off step by step according to the proportion.
9. The control method of the offshore wind power direct current export system of claim 8, wherein the second threshold voltage U2 is a direct current overvoltage protection fixed value; the first threshold voltage U1 is set so that the value of the dc voltage U at the time T2 when it starts to fall is U2 or less.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113964856A (en) * | 2021-10-11 | 2022-01-21 | 南方电网科学研究院有限责任公司 | Control method of half-bridge submodule type direct current energy consumption device |
| CN116054228A (en) * | 2023-01-16 | 2023-05-02 | 中国华能集团清洁能源技术研究院有限公司 | Quick input control method and system for energy consumption device based on limit value approximation method |
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| CN116054228A (en) * | 2023-01-16 | 2023-05-02 | 中国华能集团清洁能源技术研究院有限公司 | Quick input control method and system for energy consumption device based on limit value approximation method |
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