CN211018385U - Auxiliary power intelligent management system of offshore wind generating set - Google Patents
Auxiliary power intelligent management system of offshore wind generating set Download PDFInfo
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- CN211018385U CN211018385U CN201921276195.7U CN201921276195U CN211018385U CN 211018385 U CN211018385 U CN 211018385U CN 201921276195 U CN201921276195 U CN 201921276195U CN 211018385 U CN211018385 U CN 211018385U
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Abstract
The utility model relates to the technical field of power system operation and control, in particular to an auxiliary electricity intelligent management system of an offshore wind generating set, which is arranged on a 400V commercial power loop of the wind generating set through a first circuit breaker to realize the connection or disconnection of the whole auxiliary electricity intelligent management system and a power grid; the auxiliary electricity intelligent management system comprises a power battery cabinet, a main loop energy storage converter PCS with a system controller, an important branch energy storage converter PCS, a first transformer, a second transformer, a first static switch, a second circuit breaker, a third circuit breaker, a fourth circuit breaker and a fifth circuit breaker. The utility model provides a marine wind generating set assist the reliability of electric system and the continuity problem of power supply.
Description
Technical Field
The utility model belongs to the technical field of the technique of electric power system operation and control and specifically relates to indicate an offshore wind generating set assists electric intelligent management system.
Background
With the maturity of wind resource development technology and the appearance of large-capacity wind generating sets in China, more wind generating sets appear at sea or even deep sea, and the environment is severe and a low-voltage power supply does not exist in the places. Therefore, at present, most of control power of offshore wind generating sets can only be obtained from a high-voltage line, and only one power supply can be selected for power supply due to cost limitation, but important equipment in the sets is often required to be connected with two power supplies for power supply in order to ensure the reliable operation of a power generation system. Therefore, a plurality of UPS power supplies are added in the control loop of most wind generating sets, but the capacity of the UPS is limited, the safe power supply of the whole control system still cannot be reliably guaranteed, for example, the UPS cannot support the normal operation of the yaw system, even the continuous starting cannot be met, and for example, after the power failure time exceeds 2 hours, the power supply of the main control of the UPS continuous generating set cannot be met. Meanwhile, due to the severe environment of offshore wind power, the auxiliary power of the unit is required to be interrupted for too long time, otherwise, the unit cannot dehumidify and preserve heat, and is affected by salt mist and water vapor and the ambient temperature, so that the unit is damaged. Therefore, the problems of reliability and power supply continuity of an auxiliary power system of the offshore wind power generation unit need to be solved, and the method has important significance for continuous development of offshore wind power and realization of low-price internet surfing.
Meanwhile, the anti-typhoon measure of the existing offshore wind turbine generator system in design is structural anti-typhoon, important mechanical parts increase the safety factor to ensure the reliability of the whole structure, control strategy anti-typhoon, a typhoon mode is switched in before the typhoon comes, and a yaw system continuously works to face wind during the typhoon to reduce the load of the generator set. However, both of the two anti-platform strategies have obvious defects, for example, the safety coefficient of the structural design is increased, so that the volume and the cost of the unit are greatly improved, and the wind power flat-price internet access is not facilitated. The control strategy counter station needs to ensure that the power grid is lost under extreme conditions and the yaw system can still work normally for more than several hours, but the small-capacity UPS configured by the auxiliary power of the existing unit cannot meet the requirement. Therefore, the unit needs to be provided with an auxiliary power intelligent management system which is more reliable and has lower maintenance and use cost, meets the requirement of a typhoon-resistant strategy, and reduces the safety factor of mechanical design under the condition of ensuring that the safety of the whole unit is unchanged.
In addition, after the unit is hoisted, auxiliary electricity is usually required to be supplied for weeks or even months due to the slow progress of the overall construction of the wind field, and field installation and debugging personnel cannot debug and delay project progress in the period of time, and maintenance personnel also need to additionally perform a large amount of maintenance work due to the characteristics of marine environment, such as periodic replacement of a moisture-proof agent, periodic filtration of hydraulic oil, rotation of a generator and the like, namely high humidity and severe salt spray corrosion. The work not only wastes a great deal of time and energy of field personnel, but also delays the hoisting work of other units. Therefore, a set of auxiliary power intelligent management system is proposed and developed, after the draught fan is hoisted, necessary debugging and maintenance of the unit, such as heating and dehumidification of important parts, regular operation of a lubricating oil pump of a generator gearbox and the like can be carried out without depending on an external power grid, the workload and the consumed time of operation and maintenance personnel of the offshore unit are reduced, and the period and the cost of wind field construction are reduced.
In addition, the severe working environment at sea requires that a unit control system, dehumidification equipment, lubrication equipment and the like can work all the time until the unit can be kept in a good working state, but a wind field always meets the conditions of power grid construction, maintenance and even failure and long-time power failure, the capacity of an energy storage battery of the system is large, and when the electric quantity is exhausted, the unit can only be completely shut down under the conditions, and then a large amount of unconventional maintenance is carried out by field maintenance personnel to keep the performance of each part of the unit. However, according to the field feedback, even if the effect is not particularly good, the problems of wetting of devices, increase of lubricating oil impurities and the like caused by unit halt can occur. Therefore, a set of auxiliary power intelligent management system with a black start function needs to be developed, when a power grid of the unit is in power failure and is shut down, the unit can be off the grid, then the auxiliary power system is used for performing remote black start or local one-key black start when the wind speed meets the requirement, and the auxiliary power system form a small power grid after the black start, namely a generator and a converter generate electricity, and the auxiliary power system is used as a load, a unit maintenance device is operated, and a battery is charged. And when the wind speed is low, the unit stops, supplies power to important equipment by means of the stored energy of the auxiliary power intelligent management system and waits for the next black start, so that the self power generation and maintenance of the unit are realized, the service life of the equipment is prolonged, and the manual operation and maintenance work is reduced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's is not enough, a marine wind generating set assists electric intelligent management system is provided, the continuity problem of marine wind generating set assisting electric system's reliability and power supply has been solved, realize wind generating set and assist the dual power supply of electricity and controlgear, can realize important equipment continuous operation, the purpose of auxiliary assembly short time operation simultaneously after the electric wire netting loses the electricity to realize the black start-up of unit under certain condition is satisfied to wind speed.
In order to achieve the above object, the present invention provides a technical solution: an auxiliary power intelligent management system of an offshore wind generating set is arranged on a 400V mains supply loop of the wind generating set through a first circuit breaker, so that the connection or disconnection of the whole auxiliary power intelligent management system and a power grid is realized; the auxiliary electricity intelligent management system comprises a power battery cabinet, a main loop energy storage converter PCS with a system controller, an important branch energy storage converter PCS, a first transformer, a second transformer, a first static switch, a second circuit breaker, a third circuit breaker, a fourth circuit breaker and a fifth circuit breaker, wherein the power battery cabinet is respectively connected with the main loop energy storage converter PCS and the important branch energy storage converter PCS, and the main loop energy storage converter PCS is connected with the first transformer and then connected to the rear end of the first circuit breaker through the second circuit breaker to form a main loop of the auxiliary electricity intelligent management system; the important branch energy storage converter PCS is connected with a second transformer and then is connected with a main loop through a second static switch, a first static switch and a fourth circuit breaker in sequence, and a branch is led out between the second static switch and the first static switch and is connected with the third circuit breaker to serve as an important branch for supplying power to important equipment; and the main loop is connected with the important branch through a fifth circuit breaker, so that the connection and disconnection of the two loops are realized.
Furthermore, the first transformer and the second transformer are three-phase four-wire system isolation transformers, and the capacity of the first transformer and the capacity of the second transformer are consistent with that of the corresponding energy storage converter PCS; the first circuit breaker, the second circuit breaker, the third circuit breaker, the fourth circuit breaker and the fifth circuit breaker are all circuit breakers with rated voltage of 400V, and the rated currents of the first circuit breaker, the second circuit breaker, the third circuit breaker, the fourth circuit breaker and the fifth circuit breaker are adaptive to the maximum load current of the branch where the first circuit breaker, the second circuit breaker, the third circuit breaker, the fourth circuit breaker.
Compared with the prior art, the utility model, have following advantage and beneficial effect:
1. the utility model discloses the reliability is high, and major loop equipment has two way mains operated, and important equipment has three routes mains operated to the commercial power return circuit of important equipment and important branch road energy storage converter PCS output can realize seamless switching, and the reliability of power supply increases substantially.
2. The utility model discloses greatly reduced unit manufacturing cost, can guarantee the continuation operation of unit equipment under the power-off condition, even if power-off during the typhoon, also can guarantee the unit driftage and continue work like this, effectively reduce unit payload to reduce the limit load that needs to consider among the unit structural design process, realize cost reduction and improve effect.
3. The utility model discloses make things convenient for the unit to maintain, do not have under the circumstances of electricity at the unit commercial power at present, fortune dimension personnel can only use the ship to transport small-size diesel generator to the unit the inside, carry out interim power supply and maintain, and assist electric intelligent management system can not rely on inside power battery to provide the power consumption for fortune dimension personnel, enough fortune dimension personnel accomplish the maintenance work of unit, need not to take heavy diesel generator.
4. The utility model discloses make things convenient for the unit to maintain protection unit equipment, prolong life cycle, can support unit equipment work a period of time after the electric wire netting loses electricity to can heat, dehumidify, dispel the heat normally, eliminate the harm of the abominable environment to the unit after losing the electricity; the problem that the unit cannot be automatically started after the power grid loses power is solved, even if the power grid loses power for a long time, the auxiliary power intelligent management system can enable the unit to be started off the grid in a black mode, the auxiliary power of the unit, a large wind power generator of the unit and a converter of the unit form a micro-grid, the auxiliary power intelligent management system is not affected by the capacity of a power battery, long-time continuous operation is achieved, the unit is not affected by the environment, and the life cycle of the unit is prolonged to the maximum extent.
5. The utility model can reduce the workload of daily maintenance, the auxiliary power intelligent management system with the battery management system can continuously detect each battery for 24 hours, and the state and health degree of the battery can be known without manual inspection; and meanwhile, the system has life cycle management, namely the system can remind of replacing the battery according to working conditions and service time, and automatically bypasses the operation of the failed battery when the battery fails.
6. The utility model discloses energy-concerving and environment-protective, compare the scheme that uses diesel generator to be back-up source, do not have the consumption in battery life cycle to if use the lithium cell, can recycle thousands of times, assist electric intelligent management system efficiency in addition can reach more than 90% and can not discharge harmful, polluting substances damaged environment at whole life cycle.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific embodiments.
As shown in fig. 1, in the offshore wind turbine auxiliary power intelligent management system of this embodiment, each wind turbine is configured with an auxiliary power intelligent management system, the auxiliary power intelligent management system is installed on a 400V mains supply loop of the wind turbine by a first circuit breaker Q1, and the connection or disconnection between the whole auxiliary power intelligent management system and a power grid is realized by a first circuit breaker Q1, the auxiliary power intelligent management system includes a power battery cabinet 1, a main loop energy storage converter PCS2 with a system controller, a significant branch energy storage converter PCS 3, a first transformer T1, a second transformer T2, a first static switch S1, a second static switch S2, a second circuit breaker Q2, a third circuit breaker Q3, a fourth circuit breaker Q4 and a fifth circuit breaker Q5, the power battery cabinet 1 is connected with a main loop energy storage converter PCS2 and a significant branch energy storage converter PCS 3 respectively, the main loop energy storage converter PCS2 is connected with a first transformer T1 and then connected with the rear end of a first breaker Q1 through a second breaker Q2 to form a main loop of the system, the important branch energy storage converter PCS 3 is connected with a second transformer T2 and then sequentially connected with the main loop through a second static switch S2, a first static switch S1 and a fourth breaker Q4, a branch is led out between the second static switch S2 and the first static switch S1 and connected with a third breaker Q3 to serve as an important branch for supplying power to important equipment, the main loop is connected with the important branch through a fifth breaker Q5 to realize the on-off of the two loops, and the state switching and the working mode of each component are controlled by detecting the state of 400V mains supply of the generator set through the auxiliary electric management system to realize the charging and discharging of the auxiliary electric intelligent management system.
Wherein, power battery cabinet 1 is including power battery, atmospheric control ware, fan, air conditioner, battery management system BMS and automatic fire control unit etc. power battery can adopt lead carbon battery, lithium cell, sodium sulphur battery etc. because the mode of battery mainly used backup power just puts inside wind generating set tower section of thick bamboo, recommends to use environmental protection, safe lithium iron phosphate battery, ternary lithium cell or lead carbon battery, battery management system BMS can control air conditioner, fan, atmospheric control ware in power battery cabinet 1 and realize the intelligent control of power battery cabinet 1 internal temperature, still detects the voltage and the temperature of battery simultaneously, battery electric quantity calculation, battery health degree detection, battery charge and discharge balanced control, fault handling and realize the function with assisting electric intelligent management system communication through field data bus or optic fibre, automatic fire control unit is by temperature sensor, The fire-fighting aerosol fire extinguisher consists of a smoke sensor, a fire-fighting controller and a sol fire extinguisher, and can realize the functions of automatic fire extinguishing and warning when a fire accident happens; the main loop energy storage converter PCS2 comprises a power unit, a grid-connected reactor, a system controller and the like, wherein the system controller consists of a micro control unit MCU, a sampling loop, a driving loop and a communication loop, and is integrated with a control module, so that voltage and current detection, starting control, standby control, a grid-connected operation control strategy, a fault processing strategy, off-grid operation control, a black-start control function and a control strategy of the whole auxiliary power intelligent management system can be realized, the state of the power battery cabinet 1 is received in real time through communication, and the information of the whole auxiliary power intelligent management system is transmitted to a fan main controller; the important branch energy storage converter PCS 3 comprises a power unit and a grid-connected reactor; the first transformer T1 and the second transformer T2 are three-phase four-wire isolation transformers, and the capacity of each isolation transformer is consistent with that of the corresponding energy storage converter PCS; the first static switch S1 and the second static switch S2 are both composed of an intelligent control board, a high-speed thyristor and a high-quality breaker; the first breaker Q1, the second breaker Q2, the third breaker Q3, the fourth breaker Q4 and the fifth breaker Q5 are all rated-voltage 400V breakers, and the respective rated currents of the breakers are adaptive to the maximum load current of the branch in which the breakers are located.
The parameters of the power battery, the main loop energy storage converter PCS2 and the important branch energy storage converter PCS 3 are as follows:
the main parameters of the important equipment power of the wind generating set are shown in the table 1:
TABLE 1 loss of important parts of wind turbine
P4＝P3*n1，P6＝P5*n2，P9＝P2+P4+P5+P6+P7+P8
The maximum power of the important branch equipment of the single wind generating set is P9。
The power of the equipment on the main loop of the wind generating set is shown in table 2:
TABLE 2 wind turbine main circuit equipment losses
In the same way, the maximum power of the main loop equipment of the wind generating set is P21。
The reactive power of a single wind generating set is shown in table 3:
TABLE 3 reactive power calculation for auxiliary electric equipment of wind generating set
Q2＝Q1*n1，Q4＝Q3*n1，Q5＝Q2+Q4
Because the important branch equipment is mainly an electronic device and detection equipment, and the power factor is high, the important branch energy storage converter PCS 3 is selected according to the maximum power of the branch and a certain margin:
Sheavy load≥P9+PYu
The main loop energy storage converter PCS2 needs to output a large amount of reactive power in addition to the active power required by the equipment, so that the reactive power of the main loop equipment needs to be carefully accounted, and the capacity S of the main loop energy storage converter PCS2 must be satisfied:
the capacity of the power battery is closely related to the electric quantity consumed by the equipment, but the main loop equipment of the wind generating set does not work all the time, so that before the required battery capacity is calculated, an equivalent time coefficient T of each equipment in practical application needs to be determined, wherein the calculation method of the equivalent time coefficient T is as follows:
the period of time may be a week or a month or longer, and the longer the data is selected, the closer the data is to the actual application.
Supposing that the auxiliary power intelligent management system needs to support the wind generating set equipment to continuously work for n hours under the condition of commercial power loss, the discharge coefficient of a power battery is y, and the voltage U of a direct-current bus isdcPower battery capacity (Ah):
Sb≥n*{[(P11*T1+P13*T2+...P20*T8)+P9]÷y÷Udc}
the above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that all the changes made according to the shape and principle of the present invention should be covered within the protection scope of the present invention.
Claims (2)
1. An auxiliary power intelligent management system of an offshore wind generating set is arranged on a 400V mains supply loop of the wind generating set through a first circuit breaker, so that the connection or disconnection of the whole auxiliary power intelligent management system and a power grid is realized; the method is characterized in that: the auxiliary electricity intelligent management system comprises a power battery cabinet, a main loop energy storage converter PCS with a system controller, an important branch energy storage converter PCS, a first transformer, a second transformer, a first static switch, a second circuit breaker, a third circuit breaker, a fourth circuit breaker and a fifth circuit breaker, wherein the power battery cabinet is respectively connected with the main loop energy storage converter PCS and the important branch energy storage converter PCS, and the main loop energy storage converter PCS is connected with the first transformer and then connected to the rear end of the first circuit breaker through the second circuit breaker to form a main loop of the auxiliary electricity intelligent management system; the important branch energy storage converter PCS is connected with a second transformer and then is connected with a main loop through a second static switch, a first static switch and a fourth circuit breaker in sequence, and a branch is led out between the second static switch and the first static switch and is connected with the third circuit breaker to serve as an important branch for supplying power to important equipment; and the main loop is connected with the important branch through a fifth circuit breaker, so that the connection and disconnection of the two loops are realized.
2. The auxiliary power intelligent management system of the offshore wind generating set according to claim 1, characterized in that: the first transformer and the second transformer are three-phase four-wire system isolation transformers, and the capacity of the first transformer and the capacity of the second transformer are consistent with that of the corresponding energy storage converter PCS; the first circuit breaker, the second circuit breaker, the third circuit breaker, the fourth circuit breaker and the fifth circuit breaker are all circuit breakers with rated voltage of 400V, and the rated currents of the first circuit breaker, the second circuit breaker, the third circuit breaker, the fourth circuit breaker and the fifth circuit breaker are adaptive to the maximum load current of the branch where the first circuit breaker, the second circuit breaker, the third circuit breaker, the fourth circuit breaker.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113685317A (en) * | 2021-09-18 | 2021-11-23 | 中国船舶重工集团海装风电股份有限公司 | Floating type wind generating set comprehensive power distribution system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113685317A (en) * | 2021-09-18 | 2021-11-23 | 中国船舶重工集团海装风电股份有限公司 | Floating type wind generating set comprehensive power distribution system and method |
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