CN111614124B - Novel power supply method for large island operation mode of offshore wind farm - Google Patents
Novel power supply method for large island operation mode of offshore wind farm Download PDFInfo
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- CN111614124B CN111614124B CN202010548429.XA CN202010548429A CN111614124B CN 111614124 B CN111614124 B CN 111614124B CN 202010548429 A CN202010548429 A CN 202010548429A CN 111614124 B CN111614124 B CN 111614124B
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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
- H02J11/00—Circuit arrangements for providing service supply to auxiliaries of stations in which electric power is generated, distributed or converted
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
The invention discloses a novel power supply method for a large island operation mode of an offshore wind farm, which comprises the following steps: step 1: the method comprises the following steps that an offshore wind farm enters a large island operation mode, an offshore booster station adjusts an energy storage device, and black start is started, so that at least one fan unit is started to serve as a power supply unit; step 2: the other fan units except the power supply unit and the offshore booster station send the required total power to the power supply unit, and the power supply unit outputs power supply output power according to the required total power; and step 3: the energy storage device is used for carrying out power regulation on the power supply output power and outputting final power supply power; and 4, step 4: and transmitting the final power supply power to other fan sets and the offshore booster station to finish the power supply in the large island operation mode. The wind power generation system solves the problem of self power utilization under the condition of losing large power grid support, supplies power by taking the wind turbine generator as a main power supply, is provided with the energy storage device to adjust power balance, ensures the stability and reliability of power supply, and reduces the construction cost of the wind power plant.
Description
Technical Field
The invention relates to the technical field of wind power supply, in particular to a power supply method of a novel large island operation mode of an offshore wind farm.
Background
The electric energy generated by the wind power plant is required to be transmitted to an infinite power grid, and the large power grid is required to support the self-electricity utilization of the wind power plant. The offshore wind farm is disconnected from the power grid due to special conditions (such as extreme weather conditions like typhoons, line maintenance and overhaul and the like), so that the large power grid support is lost. Under the condition of losing large power grid support, the offshore wind farm is greatly influenced by weather (for example, the offshore wind farm is forbidden to go out of the sea during typhoon), the offshore wind farm is long in maintenance period, a fan cannot yaw for a long time due to power loss so that blades cannot be in the optimal load state, meanwhile, damage can be caused to internal equipment of the fan, the service life is shortened, so that a standby power supply (for example, a diesel generator) is generally adopted by the offshore wind farm as an emergency power supply, and the offshore wind farm is in an island operation state at the moment.
When the standby power supply is only used for power utilization of auxiliary equipment of the booster station and the fan is kept disconnected with the booster station, the operation is called small isolated island operation; when the standby power supply is used for the booster station and the auxiliary equipment of each wind turbine generator simultaneously, the operation is called large isolated island operation.
The standby power supply adopted by the current large island operation of the offshore wind farm basically adopts a diesel generator. Because after the large power grid is powered off, the standby power supply needs to be restarted to be subjected to black start, the excitation surge of each unit transformer, the charging reactive power of a line and the like can cause the diesel generator to need larger capacity to bear during the black start, the cost is higher, the black start time is longer, and the hidden trouble of black start failure exists. Diesel generators need to store enough diesel and perform maintenance on a regular basis, also adding additional cost to wind farm construction and maintenance.
Disclosure of Invention
The invention aims to provide a novel power supply method for a large island operation mode of an offshore wind farm. The method aims to solve the problems of offshore wind power plants and self-power consumption of offshore booster stations under the condition that the offshore wind power plants lose large power grid support, the wind turbine generator is used as a main power supply of a large island operation mode to supply power, a matched energy storage device is configured to adjust power balance during power supply, power supply stability and reliability of the offshore wind power plants are guaranteed, and construction cost of the offshore wind power plants is reduced.
In order to achieve the purpose, the invention provides a novel power supply method for a large island operation mode of an offshore wind farm, wherein the offshore wind farm comprises an offshore booster station and a power collection line, an energy storage device and a plurality of fan units are arranged on the power collection line, and the method comprises the following steps:
step 1: the method comprises the following steps that an offshore wind farm enters a large island operation mode, an offshore booster station adjusts an energy storage device, and black start is started, so that at least one fan unit is started to serve as a power supply unit;
step 2: the other fan units except the power supply unit and the offshore booster station send the required total power to the power supply unit, and the power supply unit outputs power supply output power according to the required total power;
and step 3: the energy storage device is used for adjusting the power of the power supply output power and outputting the final power supply power;
and 4, step 4: and transmitting the final power supply power to other fan sets and the offshore booster station to finish the power supply of the large island operation mode of the offshore wind farm.
Most preferably, the black start comprises the steps of:
step 1.1: the offshore booster station outputs reactive power which is transmitted to a current collecting line through a communication device;
step 1.2: judging whether the reactive power meets the charging requirement of the power collection line, namely whether the reactive power is smaller than the threshold value of the no-load voltage of the power collection line;
step 1.3: if the current is not satisfied, namely the reactive power is greater than the threshold value of the no-load voltage of the current collection circuit, repeating the step 1.1-1.2;
step 1.4: if the reactive power is less than or equal to the threshold value of the no-load voltage of the power collection line, the energy storage device starts at least one fan unit to serve as a power supply unit, and the power supply unit enters the no-load state.
Most preferably, the reactive power needs to be smoothly adjusted through the energy storage device during the black start process, so that the overshoot phenomenon of the reactive power is prevented.
Most preferably, the energy storage device also provides a no-load voltage of a current collecting line, so that the black start failure of the large island operation mode is prevented.
Most preferably, the total power demand is transmitted from the offshore booster station and other units to the power supply unit through the communication device.
Most preferably, the communication device is an offshore wind farm SCADA system.
Most preferably, the power regulation comprises the steps of:
step 3.1: carrying out first judgment on whether the power supply output power meets the total power demand; if the power supply output power is met, the energy storage device does not adjust the power of the power supply output power, and the output final power supply is the power supply output power;
step 3.2: if not, judging whether the power supply output power exceeds the total power required for the second time; if the power exceeds the preset power limit, adjusting the energy storage device, absorbing the power exceeding part of the power supply output power, and outputting the final power supply power;
step 3.3: if the power is not exceeded, the energy storage device is adjusted to fill up the power of the part lacking in the power supply output power, and the final power supply power is output.
Most preferably, when the power supply output power is equal to the total power demand, the power supply unit simultaneously supplies power to other units and the offshore booster station.
Most preferably, when the power supply output power exceeds the total power demand, and the energy storage device absorbs the excess power, the power supply unit simultaneously supplies power to the energy storage device, other units and the offshore booster station.
Most preferably, when the power supply output power does not exceed the total power demand and the energy storage device fills up part of the power shortage, the power supply unit and the energy storage device simultaneously supply power to other units and the offshore booster station.
By applying the method, the self-power utilization problem of the offshore wind farm and the offshore booster station under the condition that the offshore wind farm loses the support of a large power grid is solved, the wind turbine generator is used as a main power supply of a large island operation mode for power supply, and a matched energy storage device is configured to adjust the power balance during power supply, so that the power supply stability and reliability of the offshore wind farm are ensured, and the construction cost of a wind power plant is reduced.
Compared with the prior art, the invention has the following beneficial effects:
1. the wind turbine generator set is used as a large island operation power supply, large-capacity standby power supply equipment such as a diesel generator set is not needed, the problems of large investment and long construction period of the conventional standby power supply scheme of the diesel generator set are solved, and the cost can be saved to the greatest extent to improve the construction efficiency of the wind power plant.
2. The invention adopts the matched energy storage device to adjust the fluctuation of the power consumption of the wind turbine during the power supply period, improves the efficiency and the reliability of black start, solves the problem of instability caused by the power supply fluctuation of the wind turbine, and improves the operation stability and the reliability of the offshore wind power plant.
3. The invention has simple structure, convenient control, easy implementation and obvious economic benefit, fully utilizes the existing equipment of the wind power plant and reduces the construction cost of the offshore wind power plant.
4. The wind turbine generator is used as a main power supply for supplying power during the operation of the large island, and the energy storage device for power regulation is configured at the same time, so that a diesel generator which has larger capacity and needs to be installed in a booster station is not needed, the efficiency and the success rate of black start are improved, the power supply cost of the operation of the large island is greatly reduced, and the total scheme has low cost, and is safe and reliable.
Drawings
FIG. 1 is a schematic structural diagram of an offshore wind farm provided by the present invention;
FIG. 2 is a power supply flow diagram of a large island operation mode of an offshore wind farm provided by the present invention;
FIG. 3 is a flow chart of the black start provided by the present invention;
FIG. 4 is a schematic diagram of an energy storage device for an offshore wind farm;
FIG. 5 is a schematic diagram of the output power of an offshore wind farm provided by the present invention.
Detailed Description
The invention will be further described by the following specific examples in conjunction with the drawings, which are provided for illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, the offshore wind farm includes a 110KV offshore booster station 1 and a 35KV collector line; the power collection circuit is provided with an energy storage device 2 and a plurality of 7MW direct-drive wind generating sets.
When the offshore wind farm is subjected to typhoon early warning or other conditions which can cause power failure of a large power grid, if the wind farm is not disconnected with the large power grid, the offshore wind farm executes shutdown operation; and if the wind power plant is disconnected with the large power grid and the wind power plant loses the support of the large power grid, the offshore wind power plant enters a large isolated island operation mode.
The invention provides a novel power supply method for a large island operation mode of an offshore wind farm, which comprises the following steps as shown in figure 2:
step 1: an offshore wind farm enters a large island operation mode, the offshore booster station 1 adjusts the energy storage device 2, and black start is started, so that at least one fan unit is started to serve as a power supply unit.
As shown in fig. 3, the black start includes the following steps:
step 1.1: output reactive power P of offshore booster station 12The capacitive reactive power is transmitted to the current collecting circuit through the communication device and is used for compensating capacitive reactive power brought by the capacitance of the current collecting circuit to the ground (seabed) so as to prevent the voltage of the current collecting circuit from being overhigh;
step 1.2: determination of the reactive power P2Whether or not the charging requirements of the collector line, i.e. the reactive power P, are met2Whether the current is smaller than a threshold value of the no-load voltage of the current collection line;
step 1.3: if the reactive power P2Not meeting the charging requirements of the collector line, i.e. reactive power P2Greater than the threshold value of the no-load voltage of the current collecting line, at which time the reactive power P2Before the overvoltage caused by the capacitive reactive power of a compensation current collection line is compensated, the fan unit is directly started to meet the high-voltage impact, and the step 1.1-1.2 needs to be repeated;
step 1.4: if the reactive power P2Meeting the charging requirements of the collector line, i.e. reactive power P2And if the current collecting line no-load voltage is less than or equal to the threshold of the current collecting line no-load voltage, the energy storage device 2 outputs starting power to start at least one fan set as a power supply set, so that the power supply set enters an no-load state.
In the present embodiment, as shown in fig. 1, the wind turbine set 1 is selected as a power supply unit from the wind farm, and the other wind turbine sets are the wind turbine sets 2 to n.
The energy storage device 2 is matched adjusting equipment, and the energy storage device 2 is connected with the offshore booster station 1 through a communication device; in this embodiment, the communication system is a Supervisory Control And Data Acquisition (SCADA) system for a wind farm, And the SCADA system for the wind farm sends an instruction to adjust the reactive power P output by the energy storage device 2 of the offshore wind farm2。
As shown in fig. 4, during the black start, the reactive power P is also needed to be adjusted by the energy storage converter in the energy storage device 22Carry out smooth regulation to prevent reactive power in the black start processP2The phenomenon of reactive power overshoot of the power supply of the traditional diesel generator set occurs.
The energy storage device 2 also provides no-load voltage of a current collection line, and at the moment, the high-voltage side of the transformer of the wind generating set does not need to be switched off, so that excitation surge current of the transformer when the traditional diesel generating set is in black start is prevented, and black start failure of a large island operation mode is prevented.
The energy storage device 2 needs to meet the starting power of the wind generating set and the reactive power charging requirement of a current collecting line, and the energy storage device has small capacity and much lower cost than a diesel generating set; after starting the fan assembly and the power collecting line, the energy storage device 2 can be powered off.
Step 2: the other fan units except the power supply unit and the offshore booster station 1 send the total power demand P to the power supply unit in the no-load state, as shown in fig. 5, the power supply unit outputs the power supply output power P according to the total power demand P1。
The required total power P is transmitted to the power supply unit by the offshore booster station 1 and other units through the communication device; in this embodiment, the communication device is an offshore wind farm SCADA system.
The operation of the offshore wind turbine generator set is influenced by wind speed, and fluctuation occurs, and the power supply output power P output by the power supply unit needs to be ensured1And the dynamic balance is achieved with the required total power P, so that the stability of the operation of the power supply unit and the stability and reliability of the large island operation mode of the offshore wind farm are ensured.
And step 3: energy storage device 2 outputs power P to power supply1Regulating power and outputting final power supply P3(ii) a Wherein the power regulation comprises the steps of:
step 3.1: to power supply output power P1Whether the required total power P is met or not is judged for the first time; if satisfied, i.e. P1The energy storage device 2 outputs power P to the power supply1Final power supply P without power regulation3I.e. the power supply output power P1I.e. P3＝P；
Step 3.2: if not, i.e. P1Not equal to P, and power supply output power P1Whether the total power P exceeds the required power is judged for the second time; if exceeded, i.e. P1If the power supply output power is more than P, the energy storage device 2 is adjusted to absorb the power supply output power P1Excess part of power P1-P and outputs a final supply power P3I.e. P3＝P；
Step 3.3: if not, P1If the power is less than P, the energy storage device 2 is adjusted to fill the power supply output power P1Power P-P of the missing part1And outputs the final power supply P3I.e. P3＝P。
And 4, step 4: will supply the final power P3And transmitting the power to other fan sets and the offshore booster station 1 to finish the power supply of the large isolated island operation mode of the offshore wind farm.
Wherein the power supply output power P1When the required total power P is equal, the power supply unit simultaneously supplies power to other units and the offshore booster station 1 to finish the power supply of a large isolated island operation mode of the offshore wind farm;
power supply output power P1When the total power P required is exceeded, the energy storage device 2 absorbs the excess power P1P, the power supply unit simultaneously supplies power to the energy storage device 2, other units and the offshore booster station 1;
power supply output power P1When the total power P required is not exceeded, the energy storage device 2 fills up the power P of the missing part1-P, the power supply unit and the energy storage means 2 simultaneously supply power to the other units and the offshore booster station 1. The energy storage device 2 is used for storing and absorbing excessive energy in the power adjusting process, outputting and filling the missing part of energy, and ensuring the supply and demand balance of system electric energy.
Wherein the final supply power P3And transmitted to other fan units for providing self-electricity (such as yawing, dehumidifying, heating, etc.). The working principle of the invention is as follows:
the method comprises the following steps that an offshore wind farm enters a large island operation mode, an offshore booster station adjusts an energy storage device, and black start is started, so that at least one fan unit is started to serve as a power supply unit; the other fan units except the power supply unit and the offshore booster station send the required total power to the power supply unit, and the power supply unit outputs power supply output power according to the required total power; the energy storage device is used for adjusting the power of the power supply output power and outputting the final power supply power; and transmitting the final power supply power to other fan sets and the offshore booster station to finish the power supply of the large island operation mode of the offshore wind farm.
In conclusion, the novel power supply method for the large island operation mode of the offshore wind farm solves the self-power utilization problems of the offshore wind farm and the offshore booster station under the condition that the offshore wind farm loses the support of a large power grid, the wind turbine generator is used as a main power supply of the large island operation mode to supply power, and a matched energy storage device is configured to adjust the power balance during power supply, so that the power supply stability and reliability of the offshore wind farm are ensured, and the construction cost of the wind farm is reduced.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (9)
1. A novel power supply method for a large island operation mode of an offshore wind farm is characterized in that the offshore wind farm comprises an offshore booster station and a power collection line, an energy storage device and a plurality of fan units are arranged on the power collection line, and the method comprises the following steps:
step 1: the offshore wind farm enters a large island operation mode, the offshore booster station regulates the energy storage device, and black start is started, so that at least one fan unit is started to serve as a power supply unit;
step 2: other fan units and offshore booster stations except the power supply unit send the required total power to the power supply unit, and the power supply unit outputs power supply output power according to the required total power;
and step 3: the energy storage device is used for adjusting the power of the power supply output power and outputting final power supply power;
and 4, step 4: transmitting the final power supply power to the other fan sets and the offshore booster station to complete power supply of a large island operation mode of the offshore wind farm;
the black start comprises the following steps:
step 1.1: the offshore booster station outputs reactive power which is transmitted to a current collecting line through a communication device;
step 1.2: judging whether the reactive power meets the charging requirement of a power collection line, namely whether the reactive power is smaller than a threshold value of no-load voltage of the power collection line;
step 1.3: if the current is not satisfied, namely the reactive power is greater than the threshold value of the no-load voltage of the power collection line, repeating the step 1.1-1.2;
step 1.4: if the reactive power is less than or equal to the threshold value of the no-load voltage of the power collection line, starting at least one fan unit as a power supply unit by the energy storage device, and enabling the power supply unit to enter an no-load state.
2. A novel power supply method for large island operation mode of offshore wind farm according to claim 1, characterized in that during the black start, the reactive power is required to be smoothly adjusted through the energy storage device, so as to prevent overshoot phenomenon of the reactive power.
3. A novel power supply method for a large island operation mode of an offshore wind farm according to claim 1, characterized in that the energy storage device also provides a current collection line no-load voltage to prevent the large island operation mode from starting black start failure.
4. A novel offshore wind farm large island operation mode power supply method according to claim 1, characterized in that the total power demand is transmitted to the power supply unit by the offshore booster station and the other units through a communication device.
5. A novel power supply method in an offshore wind farm large island operation mode according to claim 4, characterized in that the communication device is an offshore wind farm SCADA system.
6. A method of supplying power in a novel offshore wind farm large island mode of operation as claimed in claim 1, characterized in that said power regulation comprises the steps of:
step 3.1: making a first determination as to whether the supply output power meets the total power demand; if so, the energy storage device does not perform power regulation on the power supply output power, and the output final power supply is the power supply output power;
step 3.2: if not, performing second judgment on whether the power supply output power exceeds the required total power; if the power supply output power exceeds the preset power supply output power, adjusting the energy storage device, absorbing the power of the exceeding part of the power supply output power, and outputting the final power supply power;
step 3.3: and if the power supply output power does not exceed the preset power limit value, adjusting the energy storage device, filling the power of the part lacking in the power supply output power, and outputting the final power supply power.
7. A novel offshore wind farm large island operation mode power supply method according to claim 6, characterized in that when the power supply output power is equal to the total power demand, the power supply unit simultaneously supplies power to the other units and the offshore booster station.
8. A novel offshore wind farm large island operation mode power supply method according to claim 6, characterized in that when the power supply output power exceeds the total power demand, and when the energy storage device absorbs the excess power, the power supply unit simultaneously supplies power to the energy storage device, the other units and the offshore booster station.
9. A novel offshore wind farm large island operation mode power supply method according to claim 6, characterized in that when the power supply output power does not exceed the total power demand, and when the energy storage device fills up a part of the power shortage, the power supply unit and the energy storage device simultaneously supply power to the other units and the offshore booster station.
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| CN107076111A (en) * | 2014-11-04 | 2017-08-18 | Abb瑞士股份有限公司 | For the method for the control for coordinating wind power plant during the black starting-up of islanding operation |
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| CN106471695B (en) * | 2014-11-24 | 2019-05-14 | Abb瑞士股份有限公司 | Black starting-up blower, wind power plant and the method for restoring wind power plant and blower, and the blower using this method, wind power plant |
| CN106451562A (en) * | 2016-12-16 | 2017-02-22 | 北京索英电气技术有限公司 | Black-start system and method for wind and light power storage station |
| CN107294130B (en) * | 2017-06-28 | 2020-01-17 | 东北电力大学 | Wind storage power generation black start system and energy storage configuration method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107076111A (en) * | 2014-11-04 | 2017-08-18 | Abb瑞士股份有限公司 | For the method for the control for coordinating wind power plant during the black starting-up of islanding operation |
| CN109462259A (en) * | 2018-12-25 | 2019-03-12 | 中国能源建设集团广东省电力设计研究院有限公司 | Configuration analysis method, device, equipment and the medium of marine wind electric field isolated network state |
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