CN111900759A - Offshore wind driven generator and diesel generator cooperative control method and system - Google Patents

Offshore wind driven generator and diesel generator cooperative control method and system Download PDF

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Publication number
CN111900759A
CN111900759A CN202010658638.XA CN202010658638A CN111900759A CN 111900759 A CN111900759 A CN 111900759A CN 202010658638 A CN202010658638 A CN 202010658638A CN 111900759 A CN111900759 A CN 111900759A
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diesel generator
power
instruction
generator
difference value
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Inventor
郑明�
杨源
林睿
唐文虎
陈夏
辛妍丽
刘刚
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China Energy Engineering Group Guangdong Electric Power Design Institute Co Ltd
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China Energy Engineering Group Guangdong Electric Power Design Institute Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • 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
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • 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
    • 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
    • H02J2300/10—The dispersed energy generation being of fossil origin, e.g. diesel generators
    • 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
    • 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
    • H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
    • 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
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)
  • Wind Motors (AREA)

Abstract

The invention provides a cooperative control method and system for a wind driven generator and a diesel generator in a large island mode of an offshore wind farm; the method comprises the following steps: obtaining relevant parameters through measurement, and inputting the relevant parameters into a controller; acquiring a reference instruction of a relevant parameter according to a preset value; performing difference operation according to the related parameters and the reference instructions of the related parameters to obtain differences, and inputting the differences to a controller to obtain control instructions; and controlling the wind driven generator and the diesel generator according to the control command. The active power control of the fan side converter and the pitch angle and the reactive power control of the grid side converter are coordinated with the diesel generator, so that the load capacity, the system inertia, the active quick response capacity and the reactive voltage stability of the system of the offshore wind power plant large island mode are enhanced; the operating time of a large island of an offshore wind farm is prolonged under the limitation of fuel oil of a backup diesel generator, and the controllability of a large island system is enhanced due to the cooperative operation of wind and diesel.

Description

Offshore wind driven generator and diesel generator cooperative control method and system
Technical Field
The invention relates to the technical field of control of a large island system of an offshore wind farm, in particular to a cooperative control method and a cooperative control system of an offshore wind driven generator and a diesel generator.
Background
When the offshore wind farm is sent out of the submarine cable at high voltage to cause an accident or the offshore wind farm is sent out of the overhead line on land to cause a fault, the offshore wind farm loses the external power grid connection. The offshore wind turbine generator has a certain capability of maintaining communication control in a short time after power failure, but does not have the capability of resisting operation of high-power motors such as salt spray, yaw, feathering and the like. Meanwhile, according to the standard requirement, an emergency power supply is required to be matched with the marine step-up transformer substation, emergency loads such as a communication power supply, a monitoring power supply, emergency lighting, emergency ventilation, a fire-fighting fire system, escape equipment and navigation equipment are guaranteed, and a standby diesel generator and an oil storage tank power supply mode is mostly adopted abroad. Besides being used as one of emergency power supplies of offshore booster stations, diesel generator sets are also used for providing a standby power supply for wind turbine generators under the isolated grid condition in projects, so that auxiliary equipment in the wind turbine generators can be kept in a working state in a power supply mode of the power supply after the power grid is powered off for a certain time, and the mode is called as a large isolated island mode by Siemens corporation.
In the existing offshore wind farm large island mode design, the capacity of a configurable diesel generator is strictly limited by the space and cost of an offshore booster station, and the capacity of the configurable diesel generator can only meet the total amount of emergency loads of the offshore wind farm booster station and auxiliary loads of all fans. In practice, if the transformer loss of a large-capacity wind generating set and the yaw load of the wind driven generator are considered, the matched auxiliary diesel generator cannot meet the power consumption requirements of all auxiliary equipment in a large island mode of an offshore wind farm, the time consumption for transporting fuel oil in the open sea is long, the cost is high, the single oil storage capacity of the offshore platform can only run for dozens of hours at full load, and the time is far shorter than the fault repair time of a high-voltage submarine cable. As a wind farm, a wind generator is the best supplement or replacement of the power source, as weather conditions allow. The conventional way of operating a wind turbine is in maximum power tracking mode, i.e. capturing as much energy as possible at the current wind speed. However, in a large island mode of an offshore wind farm, except for an off-course load, the sum of the total load amount of power supply and the total active loss amount of a system is usually far lower than the rated capacity of a single wind driven generator, so that the wind driven generator is required to have the capacity of reducing power and operating at low power; meanwhile, the diesel generator is used as the only reference power supply of the large island system of the offshore wind farm, the capacity of the diesel generator is obviously smaller than the capacity of a single offshore wind turbine which is continuously increased, and the large island system is broken down due to instability of the diesel generator caused by rapid increase and decrease of power output of a fan.
Disclosure of Invention
Aiming at the problems, the invention provides a cooperative control method of the offshore wind farm large island mode wind driven generator and the diesel generator, which improves the control strategy of the full-power wind driven generator from two aspects of active power-frequency and reactive power-voltage, so that the load capacity of a large island system is increased, the inertia of the system is enhanced, the voltage of the system is stabilized and the diesel generator is maintained to operate in a specified state while the power generation task of the diesel generator is shared.
One embodiment of the invention provides a cooperative control method for a wind driven generator and a diesel generator in a large island mode of an offshore wind farm, which comprises the following steps:
obtaining relevant parameters through measurement, and inputting the relevant parameters into a controller; wherein the relevant parameters include: the system comprises a wind turbine, a diesel generator, a high-power load input instruction, a bus voltage and a power supply, wherein the wind turbine is connected with the diesel generator through a power supply; the high-power load is a power increment which needs the wind driven generator to meet the load requirement when the output of the diesel generator exceeds the capacity range of the diesel generator or the diesel generator is unstable due to single input of load power;
acquiring a reference instruction of a relevant parameter according to a preset value; wherein the relevant parameter instructions include: a rotating speed reference instruction of the wind turbine, a rotating speed reference instruction of the diesel generator, an active power reference instruction of the diesel generator, a reactive power reference instruction of the diesel generator and a reference instruction of bus voltage;
performing difference operation according to the related parameters and the reference instructions of the related parameters to obtain differences, and inputting the differences to a controller to obtain control instructions; wherein the control instructions include: a fan blade pitch angle control instruction, a primary frequency modulation power instruction, a secondary frequency modulation power instruction, a diesel generator constant power control instruction, a wind and diesel cooperative active control instruction and a fan grid side converter output reactive instruction;
and controlling the wind driven generator and the diesel generator according to the control command.
Further, the performing a difference operation according to the relevant parameter and the reference instruction of the relevant parameter to obtain a difference value, and inputting the difference value to a controller to obtain a control instruction includes:
carrying out difference operation on the rotating speed of the wind turbine and a rotating speed reference instruction of the wind turbine to obtain a rotating speed difference value of the wind turbine, wherein the rotating speed difference value of the wind turbine is subjected to a fan blade pitch angle control instruction through a PI (proportional integral) controller;
carrying out difference operation on the rotating speed of the diesel generator and a rotating speed reference instruction of the diesel generator to obtain a rotating speed difference value of the diesel generator, wherein the rotating speed difference value of the diesel generator is subjected to primary frequency modulation power instruction through an inertia controller;
performing difference operation on the active power of the diesel generator and an active power reference instruction of the diesel generator to obtain an active power difference value of the diesel generator, wherein the active power difference value of the diesel generator passes through a PI (proportional-integral) controller and a slope limiter to obtain a constant power control instruction of the diesel generator;
performing difference operation on the bus voltage and the reference instruction of the bus voltage to obtain a bus voltage difference value, and performing difference operation on the reactive power of the diesel generator and the reactive power reference instruction of the diesel generator to obtain a reactive power difference value of the diesel generator; and the bus voltage difference value and the reactive power difference value of the diesel generator are subjected to PI controller to obtain a reactive power instruction output by the fan grid side converter.
And further, combining the primary frequency modulation power instruction with the constant power control instruction of the diesel generator to obtain a wind-diesel cooperative active control instruction.
Further, the obtaining of the relevant parameters through measurement and the inputting of the relevant parameters into the controller include:
measuring the rotational speed of the wind turbine and inputting the real-time rotational speed of the wind turbine into a pitch angle controller of the wind turbine;
measuring the rotating speed of a diesel generator, and inputting the rotating speed of the diesel generator into a side converter controller of a draught fan;
measuring an output reactive power measurement value of a diesel generator, and inputting the output reactive power measurement value of the diesel generator into a grid-side converter controller of a wind driven generator;
the bus voltage is measured and input into a grid-side converter controller of the wind turbine.
Further, the controlling the wind power generator and the diesel generator according to the control command includes:
adjusting the pitch angle of the fan blade according to the fan blade pitch angle control instruction to realize slow adjustment of the fan blade;
adjusting the active power output by the fan according to the wind-diesel cooperative active control instruction and the secondary frequency modulation power instruction;
and adjusting the output reactive power of the fan according to the output reactive instruction of the fan grid side converter.
Further, the obtaining of the reference instruction of the relevant parameter according to the preset value includes:
the rotating speed reference instruction of the wind turbine is a rated rotating speed in a conventional power generation state;
the rotating speed reference instruction of the diesel generator is 50 Hz;
the active power reference instruction of the diesel generator is determined according to the actual active output of the diesel generator when the wind driven generator is started, if the actual active power is larger than 50% of the rated power, the active power reference instruction of the diesel generator is set to be 50% of the rated power, and otherwise, the active power reference instruction of the diesel generator is set to be the active power of the diesel generator.
An embodiment of the present invention provides a cooperative control system for an offshore wind farm large island mode wind turbine generator and a diesel generator, including:
the relevant parameter acquisition module is used for acquiring relevant parameters through measurement and inputting the relevant parameters into the controller; wherein the relevant parameters include: the system comprises a wind turbine, a diesel generator, a high-power load input instruction, a bus voltage and a power supply, wherein the wind turbine is connected with the diesel generator through a power supply; when the output of the diesel generator exceeds the capacity range of the diesel generator or the diesel generator is unstable due to the single input of the load power, the high-power load needs the wind driven generator to meet the power increment of the load demand;
the reference instruction acquisition module is used for acquiring a reference instruction of the relevant parameter according to a preset value; wherein the relevant parameter instructions include: a rotating speed reference instruction of the wind turbine, a rotating speed reference instruction of the diesel generator, an active power reference instruction of the diesel generator, a reactive power reference instruction of the diesel generator and a reference instruction of bus voltage;
the difference value operation module is used for performing difference value operation according to the related parameters and the reference instructions of the related parameters to obtain difference values, and inputting the difference values to the controller to obtain control instructions; wherein the control instructions include: a fan blade pitch angle control instruction, a primary frequency modulation power instruction, a secondary frequency modulation power instruction, a diesel generator constant power control instruction, a wind and diesel cooperative active control instruction and a fan grid side converter output reactive instruction;
and the control module is used for controlling the wind driven generator and the diesel generator according to the control instruction.
Further, the difference operation module includes:
the rotating speed difference value operation submodule of the wind turbine is used for carrying out difference value operation on the rotating speed of the wind turbine and a rotating speed reference instruction of the wind turbine to obtain a rotating speed difference value of the wind turbine, and the rotating speed difference value of the wind turbine is subjected to a fan blade pitch angle control instruction through a PI (proportional integral) controller;
the rotation speed difference value operation submodule of the diesel generator is used for carrying out difference value operation on the rotation speed of the diesel generator and a rotation speed reference instruction of the diesel generator to obtain a rotation speed difference value of the diesel generator, and the rotation speed difference value of the diesel generator is subjected to primary frequency modulation power instruction through an inertia controller;
the active power difference value operation submodule of the diesel generator is used for carrying out difference value operation on the active power of the diesel generator and an active power reference instruction of the diesel generator to obtain an active power difference value of the diesel generator, and the active power difference value of the diesel generator is subjected to a constant power control instruction of the diesel generator through a PI (proportional-integral) controller and a slope limiter;
the bus voltage difference value operation submodule is used for carrying out difference value operation on the bus voltage and the reference instruction of the bus voltage to obtain a bus voltage difference value, and carrying out difference value operation on the reactive power of the diesel generator and the reactive power reference instruction of the diesel generator to obtain a reactive power difference value of the diesel generator; and the bus voltage difference value and the reactive power difference value of the diesel generator are subjected to PI controller to obtain a reactive power instruction output by the fan grid side converter.
Further, the related parameter obtaining module includes:
the rotating speed acquisition submodule of the wind turbine is used for measuring the rotating speed of the wind turbine and inputting the real-time rotating speed of the wind turbine into a pitch angle controller of the wind turbine;
the rotating speed acquisition submodule of the diesel generator is used for measuring the rotating speed of the diesel generator and inputting the rotating speed of the diesel generator into the side converter controller of the fan machine;
the output reactive power measurement value acquisition submodule of the generator is used for measuring the output reactive power measurement value of the diesel generator and inputting the output reactive power measurement value of the diesel generator into a grid-side converter controller of the wind driven generator;
and the bus voltage acquisition submodule is used for measuring the bus voltage and inputting the bus voltage into a grid-side converter controller of the wind driven generator.
Further, the control module includes:
the fan blade pitch angle control submodule is used for adjusting the fan blade pitch angle according to the fan blade pitch angle control instruction so as to realize slow adjustment of the fan blade;
the fan output active power control submodule is used for adjusting the fan output active power according to the wind-diesel cooperative active power control instruction and the secondary frequency modulation power instruction;
and the fan output reactive power control submodule is used for adjusting the fan output reactive power according to the fan grid side converter output reactive power instruction.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
the method comprises the steps of obtaining relevant parameters through measurement, and inputting the relevant parameters into a controller; acquiring a reference instruction of a relevant parameter according to a preset value; performing difference operation according to the related parameters and the reference instructions of the related parameters to obtain differences, and inputting the differences to a controller to obtain control instructions; and controlling the wind driven generator and the diesel generator according to the control command. The control method provided by the invention initiatively starts the full-power wind driven generator and the backup diesel generator to supply power together in the large island operation of the offshore wind farm, and coordinates the active power control of the fan side converter and the pitch angle with the reactive power control of the grid side converter and the diesel generator, thereby enhancing the load capacity, the system inertia, the active fast response capacity and the system reactive voltage stability of the large island mode of the offshore wind farm. The operating time of a large island of an offshore wind farm is prolonged under the limitation of fuel oil of a backup diesel generator, and the large island system has richer controllability due to wind-diesel cooperative operation.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a cooperative control method for an offshore wind farm large island mode wind turbine generator and a diesel generator according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for cooperative control of an offshore wind farm wind turbine generator and a diesel generator in a large island mode according to another embodiment of the present invention;
fig. 3 is an active control logic diagram of a full-power wind turbine generator in a large island mode of an offshore wind farm according to an embodiment of the present invention;
fig. 4 is a reactive power control logic diagram of a grid-side converter of a full-power wind turbine generator in a large island mode of an offshore wind farm according to an embodiment of the present invention;
fig. 5 is an exemplary diagram of an electrical structure of a large island system of an offshore wind farm in an application scenario provided by an embodiment of the present invention;
FIG. 6 is a diagram of an apparatus of a cooperative control system of a wind turbine generator and a diesel generator in a large island mode of an offshore wind farm according to an embodiment of the present invention;
fig. 7 is a device diagram of a cooperative control system of an offshore wind farm large island mode wind turbine generator and a diesel generator according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
A first aspect.
Referring to fig. 1, an embodiment of the present invention provides a method for cooperatively controlling a wind turbine generator and a diesel generator in a large island mode of an offshore wind farm, including:
and S10, acquiring related parameters through measurement, and inputting the related parameters into the controller.
Wherein the relevant parameters include: the system comprises a wind turbine, a diesel generator, a high-power load input instruction, a bus voltage and a power supply, wherein the wind turbine is connected with the diesel generator through a power supply; the high-power load is a power increment which needs the wind driven generator to meet the load requirement when the output of the diesel generator exceeds the capacity range of the diesel generator or the diesel generator is unstable due to single input of load power.
Specifically, measuring the rotation speed of the wind turbine and inputting the real-time rotation speed of the wind turbine into a pitch angle controller of the wind turbine;
measuring the rotating speed of a diesel generator, and inputting the rotating speed of the diesel generator into a side converter controller of a draught fan;
measuring an output reactive power measurement value of a diesel generator, and inputting the output reactive power measurement value of the diesel generator into a grid-side converter controller of a wind driven generator;
the bus voltage is measured and input into a grid-side converter controller of the wind turbine.
And S20, acquiring a reference instruction of the relevant parameter according to the preset value.
Wherein the relevant parameter instructions include: a rotating speed reference instruction of the wind turbine, a rotating speed reference instruction of the diesel generator, an active power reference instruction of the diesel generator, a reactive power reference instruction of the diesel generator and a reference instruction of the bus voltage.
Specifically, the rotating speed reference instruction of the wind turbine is a rated rotating speed in a normal power generation state;
the rotating speed reference instruction of the diesel generator is 50 Hz;
the active power reference instruction of the diesel generator is determined according to the actual active output of the diesel generator when the wind driven generator is started, if the actual active power is larger than 50% of the rated power, the active power reference instruction of the diesel generator is set to be 50% of the rated power, and otherwise, the active power reference instruction of the diesel generator is set to be the active power of the diesel generator.
And S30, performing difference operation according to the related parameters and the reference instructions of the related parameters to obtain differences, and inputting the differences to a controller to obtain control instructions.
Wherein the control instructions include: the system comprises a fan blade pitch angle control instruction, a primary frequency modulation power instruction, a secondary frequency modulation power instruction, a diesel generator constant power control instruction, a wind and diesel cooperative active control instruction and a fan grid side converter output reactive instruction.
Specifically, the rotating speed of the wind turbine and the rotating speed reference instruction of the wind turbine are subjected to difference operation to obtain a rotating speed difference value of the wind turbine, and the rotating speed difference value of the wind turbine is subjected to PI controller to obtain a fan blade pitch angle control instruction.
And carrying out difference operation on the rotating speed of the diesel generator and the rotating speed reference instruction of the diesel generator to obtain a rotating speed difference value of the diesel generator, wherein the rotating speed difference value of the diesel generator is subjected to primary frequency modulation power instruction by an inertia controller.
And performing difference operation on the active power of the diesel generator and the active power reference instruction of the diesel generator to obtain an active power difference value of the diesel generator, wherein the active power difference value of the diesel generator passes through a PI (proportional-integral) controller and a slope limiter to obtain a constant power control instruction of the diesel generator.
Performing difference operation on the bus voltage and the reference instruction of the bus voltage to obtain a bus voltage difference value, and performing difference operation on the reactive power of the diesel generator and the reactive power reference instruction of the diesel generator to obtain a reactive power difference value of the diesel generator; and the bus voltage difference value and the reactive power difference value of the diesel generator are subjected to PI controller to obtain a reactive power instruction output by the fan grid side converter.
And combining the primary frequency modulation power instruction with the constant power control instruction of the diesel generator to obtain a wind-diesel cooperative active control instruction.
And S40, controlling the wind driven generator and the diesel generator according to the control command.
Specifically, the pitch angle of the fan blade is adjusted according to the control instruction of the pitch angle of the fan blade, so that the slow adjustment of the fan blade is realized; adjusting the active power output by the fan according to the wind-diesel cooperative active control instruction and the secondary frequency modulation power instruction; and adjusting the output reactive power of the fan according to the output reactive instruction of the fan grid side converter.
Compared with the existing offshore wind farm large island operation control technology, the control method provided by the invention initiatively starts the full-power wind driven generator and the backup diesel generator to supply power together in the offshore wind farm large island operation, and enhances the load capacity, the system inertia, the active quick response capacity and the system reactive voltage stability of the offshore wind farm large island mode through the active power control of the fan side converter and the pitch angle and the reactive power control of the grid side converter and the coordination of the diesel generator. The operating time of a large island of an offshore wind farm is prolonged under the limitation of fuel oil of a backup diesel generator, and the large island system has richer controllability due to wind-diesel cooperative operation.
In a specific embodiment, referring to fig. 2, an embodiment of the present invention provides a method for cooperatively controlling an offshore wind farm wind turbine in a large island mode and a diesel generator, including:
step A: obtaining wind turbine speed ωturInputting a pitch angle controller to obtain the rotating speed omega of the diesel generatorDGActive power output P of diesel generatorDGAnd a high power load input instruction PwsInput machine side converter controller for obtaining system bus voltage VbusAnd the output reactive Q of the diesel generatorDGInput net side converter controller specifically includes:
measuring real-time rotational speed omega of a wind turbine by means of a rotational speed sensorturAnd transmits the rotational speed signal to a pitch angle controller of the wind turbine. Measuring the rotation speed omega of a diesel generator by a rotation speed sensorDGAnd the data is transmitted to a side converter controller of the fan machine in a wireless transmission mode. High power load input instruction PwsMeaning that a single load power input will result in diesel fuelWhen the output of the generator exceeds the capacity range or the diesel generator is possibly unstable, the wind driven generator is required to actively and quickly respond to the power increment required by the load, and if the high-power load is input for many times, the P is calculated according to the formula (1)ws：
Figure BDA0002577676550000121
Wherein Δ PiThe command for putting high power load for the ith time. Measured value of bus voltage VbusAnd the diesel generator outputs a reactive measurement value QDGAnd transmitting the signal to a grid-side converter controller of the wind driven generator through a wireless signal.
And B: determining a rotational speed reference command omega for a wind turbinerateDetermining a reference speed command omega of the diesel generatorrefDetermining the active power reference instruction P of the diesel generatorDGrefDetermining a system bus voltage reference command Vbus_refDetermining a reference command Q for reactive power of the diesel generatorDG_refThe method specifically comprises the following steps:
wind turbine speed reference command omegarateThe rated rotational speed for the normal power generation state is set, which is considered based on the wind turbine mechanical state optimum at the rated rotational speed. Diesel generator speed reference instruction omegarefAnd system bus voltage reference instruction Vbus_refRespectively setting the system frequency of 50Hz and 35kV as standard, and converting the frequency f into a diesel generator rotating speed reference value through an equation (2):
ωrate＝2πf (2)
the initial active power reference instruction of the diesel generator needs to be determined according to the actual active power output of the diesel generator when the wind driven generator is started, and the real-time active power of the diesel generator before the fan is started cannot be exceeded, because the fan cannot absorb the active power. PDGrefDetermined by equation (3):
Figure BDA0002577676550000131
reactive power of diesel generatorPower reference command QDG_refIt is necessary to set the power factor according to specific requirements, for example, if it is desired that the diesel generator always operates in a rated power factor state, where the rated power factor is cos α, Q isDG_refSetting as shown in formula (4):
QDG_ref＝PDGreftanα (4)
and C: giving a fan blade pitch angle command through the wind turbine speed deviation and limiting the range of the command; determining whether to start primary frequency modulation or not by judging whether the deviation of the rotating speed of the diesel generator exceeds a set dead zone or not; obtaining active power which is required to be shared by a fan and enables the diesel generator to output the active power to be constant; through the reactive reference value of bus voltage deviation and diesel generator reactive deviation given fan output, specifically include:
as shown in FIG. 3, in the constant speed pitch angle control strategy, the wind turbine speed ωturWith a reference speed command omegarateThe difference of (a) is subjected to a fan blade pitch angle command beta obtained by a PI controller, and the command is limited, including a change rate and upper and lower limits, wherein the change rate is limited in order to reduce frequent changes of the pitch angle. FIG. 3 shows the diesel generator speed ω in the primary frequency control strategyDGWith a reference speed command omegarefThe difference is judged to determine whether to start a primary frequency modulation strategy or not through a dead zone, so that oscillation caused by primary frequency modulation control under the condition that the frequency deviation of a system is small enough is avoided; then the rotation speed difference value is subjected to an inertia link to obtain primary frequency modulation power P of the fanwp. FIG. 3 shows the actual active power P of the diesel generator in the constant power control of the diesel generatorDGAnd a reference instruction PDGrefAfter the difference of the positive power P and the negative power P passes through a PI controller and a change rate limiter, the active power P output by the diesel generator is shared by the fanRDG. The active output instruction of the fan is shown by an equation (5):
Psref＝Pws+Pwp+PRDG(5)
as shown in fig. 4, the system bus voltage V is setbusAnd a reference instruction Vbus_refAnd the output of the diesel generator is idle QDGAnd reactive reference instruction QDG_refRespectively pass through twoSumming the different PI controllers to obtain a reactive output instruction Q of the fan grid side converterGSC_ref。
Step D: adopt permanent rotational speed pitch angle control strategy to adjust fan blade pitch angle, adopt wind firewood cooperation active control and secondary frequency modulation control to adjust fan output active, adopt wind firewood cooperation reactive power control to adjust fan output reactive, finally make marine wind power plant big island operating system power balance, voltage stabilization and frequency stabilization, specifically include:
after obtaining the pitch angle control command β, the wind turbine changes the converted wind power by adjusting the pitch angle, i.e. changing the input mechanical torque T, as shown in fig. 3mAt TmAnd electromagnetic torque TeBefore the balance is gradually reached, the power is balanced by the change of the rotating speed of the fan, namely the change of kinetic energy. Outputting an active power output instruction P to the fansrefThe output of the alternating voltage of the machine side converter is regulated through PI dual-ring control, so that the electromagnetic torque and the electromagnetic power of the fan are regulated. As shown in fig. 4, the reactive output instruction Q of the wind turbine grid-side converter is setGSC_refAnd inputting the voltage into a fan grid-side converter controller, and controlling the reactive output and the direct-current voltage stability of the full-power converter respectively through the PI double-ring control regulation grid-side converter. Under the combined action of active control and reactive compensation of the fan, the large island operation system of the offshore wind farm achieves the states of power balance, voltage stability and frequency stability.
Aiming at the characteristics, in a large island operation mode of the offshore wind farm, a small-capacity diesel generator is initiatively used as a reference source, a full-power wind driven generator is started to share the load demand, and meanwhile, the inertia of the system is enhanced, the diesel generator is protected, and the response capability of the large island system to the high-power load switching is enhanced; the wind turbine grid-side converter is used as a static var generator, the voltage stability of the system is enhanced, and the reactive output of the diesel generator is optimized, so that the capacity and the running time of the large island system of the offshore wind farm are obviously improved, and the economic benefit of the large island operation is improved.
A second aspect.
Referring to fig. 6 to 7, an embodiment of the present invention provides a cooperative control system for a wind turbine generator and a diesel generator in a large island mode of an offshore wind farm, including:
the related parameter obtaining module 10 is used for obtaining related parameters through measurement and inputting the related parameters into the controller; wherein the relevant parameters include: the system comprises a wind turbine, a diesel generator, a high-power load input instruction, a bus voltage and a power supply, wherein the wind turbine is connected with the diesel generator through a power supply; when the output of the diesel generator exceeds the capacity range of the diesel generator or the diesel generator is unstable due to the single input of the load power, the high-power load needs the wind driven generator to meet the power increment of the load demand;
the reference instruction obtaining module 20 is configured to obtain a reference instruction of a relevant parameter according to a preset value; wherein the relevant parameter instructions include: a rotating speed reference instruction of the wind turbine, a rotating speed reference instruction of the diesel generator, an active power reference instruction of the diesel generator, a reactive power reference instruction of the diesel generator and a reference instruction of bus voltage;
the difference operation module 30 is configured to perform difference operation according to the relevant parameter and the reference instruction of the relevant parameter to obtain a difference value, and input the difference value to the controller to obtain a control instruction; wherein the control instructions include: a fan blade pitch angle control instruction, a primary frequency modulation power instruction, a secondary frequency modulation power instruction, a diesel generator constant power control instruction, a wind and diesel cooperative active control instruction and a fan grid side converter output reactive instruction;
and the control module 40 is used for controlling the wind driven generator and the diesel generator according to the control instruction.
Specifically, the difference operation module 30 includes:
the rotating speed difference value operation submodule 31 of the wind turbine is used for carrying out difference value operation on the rotating speed of the wind turbine and a rotating speed reference instruction of the wind turbine to obtain a rotating speed difference value of the wind turbine, and the rotating speed difference value of the wind turbine is subjected to a fan blade pitch angle control instruction through a PI (proportional integral) controller;
the rotation speed difference operation submodule 32 of the diesel generator is used for carrying out difference operation on the rotation speed of the diesel generator and a rotation speed reference instruction of the diesel generator to obtain a rotation speed difference value of the diesel generator, and the rotation speed difference value of the diesel generator is subjected to primary frequency modulation power instruction through an inertia controller;
the active power difference value operation submodule 33 of the diesel generator is used for performing difference value operation on the active power of the diesel generator and the active power reference instruction of the diesel generator to obtain an active power difference value of the diesel generator, and the active power difference value of the diesel generator is subjected to a constant power control instruction of the diesel generator through a PI (proportional-integral) controller and a slope limiter;
the bus voltage difference value operation sub-module 34 is configured to perform difference operation on the bus voltage and the reference instruction of the bus voltage to obtain a bus voltage difference value, and perform difference operation on the reactive power of the diesel generator and the reactive power reference instruction of the diesel generator to obtain a reactive power difference value of the diesel generator; and the bus voltage difference value and the reactive power difference value of the diesel generator are subjected to PI controller to obtain a reactive power instruction output by the fan grid side converter.
The related parameter obtaining module 10 includes:
the rotating speed acquisition submodule 11 of the wind turbine is used for measuring the rotating speed of the wind turbine and inputting the real-time rotating speed of the wind turbine into a pitch angle controller of the wind turbine;
the rotating speed obtaining submodule 12 of the diesel generator is used for measuring the rotating speed of the diesel generator and inputting the rotating speed of the diesel generator into the side converter controller of the fan machine;
the output reactive power measurement value acquisition submodule 13 of the generator is used for measuring the output reactive power measurement value of the diesel generator and inputting the output reactive power measurement value of the diesel generator into a grid-side converter controller of the wind driven generator;
the bus voltage acquisition submodule 14 is configured to measure a bus voltage and input the bus voltage to a grid-side converter controller of the wind turbine.
The control module 40 includes:
the fan blade pitch angle control submodule 41 is used for adjusting the fan blade pitch angle according to the fan blade pitch angle control instruction, so that the slow adjustment of the fan blade is realized;
the fan output active power control submodule 42 is used for adjusting the fan output active power according to the wind-diesel cooperative active control instruction and the secondary frequency modulation power instruction;
and the fan output reactive power control submodule 43 is used for adjusting the fan output reactive power according to the fan grid side converter output reactive power instruction.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (10)

1. A cooperative control method for a wind driven generator and a diesel generator in a large island mode of an offshore wind farm is characterized by comprising the following steps:
obtaining relevant parameters through measurement, and inputting the relevant parameters into a controller; wherein the relevant parameters include: the system comprises a wind turbine, a diesel generator, a high-power load input instruction, a bus voltage and a power supply, wherein the wind turbine is connected with the diesel generator through a power supply; the high-power load is a power increment which needs the wind driven generator to meet the load requirement when the output of the diesel generator exceeds the capacity range of the diesel generator or the diesel generator is unstable due to single input of load power;
acquiring a reference instruction of a relevant parameter according to a preset value; wherein the relevant parameter instructions include: a rotating speed reference instruction of the wind turbine, a rotating speed reference instruction of the diesel generator, an active power reference instruction of the diesel generator, a reactive power reference instruction of the diesel generator and a reference instruction of bus voltage;
performing difference operation according to the related parameters and the reference instructions of the related parameters to obtain differences, and inputting the differences to a controller to obtain control instructions; wherein the control instructions include: a fan blade pitch angle control instruction, a primary frequency modulation power instruction, a secondary frequency modulation power instruction, a diesel generator constant power control instruction, a wind and diesel cooperative active control instruction and a fan grid side converter output reactive instruction;
and controlling the wind driven generator and the diesel generator according to the control command.
2. The method according to claim 1, wherein the performing a difference operation according to the relevant parameter and the reference command of the relevant parameter to obtain a difference value, and inputting the difference value to a controller to obtain a control command comprises:
carrying out difference operation on the rotating speed of the wind turbine and a rotating speed reference instruction of the wind turbine to obtain a rotating speed difference value of the wind turbine, wherein the rotating speed difference value of the wind turbine is subjected to a fan blade pitch angle control instruction through a PI (proportional integral) controller;
carrying out difference operation on the rotating speed of the diesel generator and a rotating speed reference instruction of the diesel generator to obtain a rotating speed difference value of the diesel generator, wherein the rotating speed difference value of the diesel generator is subjected to primary frequency modulation power instruction through an inertia controller;
performing difference operation on the active power of the diesel generator and an active power reference instruction of the diesel generator to obtain an active power difference value of the diesel generator, wherein the active power difference value of the diesel generator passes through a PI (proportional-integral) controller and a slope limiter to obtain a constant power control instruction of the diesel generator;
performing difference operation on the bus voltage and the reference instruction of the bus voltage to obtain a bus voltage difference value, and performing difference operation on the reactive power of the diesel generator and the reactive power reference instruction of the diesel generator to obtain a reactive power difference value of the diesel generator; and the bus voltage difference value and the reactive power difference value of the diesel generator are subjected to PI controller to obtain a reactive power instruction output by the fan grid side converter.
3. The method as claimed in claim 2, wherein the primary frequency modulation power command is combined with the diesel generator constant power control command to obtain a wind-diesel cooperative active control command.
4. The method for cooperatively controlling the offshore wind farm large island mode wind power generator and the diesel generator according to claim 1, wherein the obtaining of the relevant parameters through measurement and the inputting of the relevant parameters into the controller comprise:
measuring the rotational speed of the wind turbine and inputting the real-time rotational speed of the wind turbine into a pitch angle controller of the wind turbine;
measuring the rotating speed of a diesel generator, and inputting the rotating speed of the diesel generator into a side converter controller of a draught fan;
measuring an output reactive power measurement value of a diesel generator, and inputting the output reactive power measurement value of the diesel generator into a grid-side converter controller of a wind driven generator;
the bus voltage is measured and input into a grid-side converter controller of the wind turbine.
5. The method according to claim 1, wherein the controlling the wind turbine generator and the diesel generator according to the control command comprises:
adjusting the pitch angle of the fan blade according to the fan blade pitch angle control instruction to realize slow adjustment of the fan blade;
adjusting the active power output by the fan according to the wind-diesel cooperative active control instruction and the secondary frequency modulation power instruction;
and adjusting the output reactive power of the fan according to the output reactive instruction of the fan grid side converter.
6. The method for cooperatively controlling the wind power generator in the offshore wind farm large island mode and the diesel generator according to claim 1, wherein the obtaining of the reference command of the relevant parameter according to the preset value comprises:
the rotating speed reference instruction of the wind turbine is a rated rotating speed in a conventional power generation state;
the rotating speed reference instruction of the diesel generator is 50 Hz;
the active power reference instruction of the diesel generator is determined according to the actual active output of the diesel generator when the wind driven generator is started, if the actual active power is larger than 50% of the rated power, the active power reference instruction of the diesel generator is set to be 50% of the rated power, and otherwise, the active power reference instruction of the diesel generator is set to be the active power of the diesel generator.
7. The utility model provides an offshore wind farm big island mode aerogenerator and diesel generator cooperative control system which characterized in that includes:
the relevant parameter acquisition module is used for acquiring relevant parameters through measurement and inputting the relevant parameters into the controller; wherein the relevant parameters include: the system comprises a wind turbine, a diesel generator, a high-power load input instruction, a bus voltage and a power supply, wherein the wind turbine is connected with the diesel generator through a power supply; when the output of the diesel generator exceeds the capacity range of the diesel generator or the diesel generator is unstable due to the single input of the load power, the high-power load needs the wind driven generator to meet the power increment of the load demand;
the reference instruction acquisition module is used for acquiring a reference instruction of the relevant parameter according to a preset value; wherein the relevant parameter instructions include: a rotating speed reference instruction of the wind turbine, a rotating speed reference instruction of the diesel generator, an active power reference instruction of the diesel generator, a reactive power reference instruction of the diesel generator and a reference instruction of bus voltage;
the difference value operation module is used for performing difference value operation according to the related parameters and the reference instructions of the related parameters to obtain difference values, and inputting the difference values to the controller to obtain control instructions; wherein the control instructions include: a fan blade pitch angle control instruction, a primary frequency modulation power instruction, a secondary frequency modulation power instruction, a diesel generator constant power control instruction, a wind and diesel cooperative active control instruction and a fan grid side converter output reactive instruction;
and the control module is used for controlling the wind driven generator and the diesel generator according to the control instruction.
8. The offshore wind farm large island mode wind turbine and diesel generator cooperative control system according to claim 7, wherein the difference operation module comprises:
the rotating speed difference value operation submodule of the wind turbine is used for carrying out difference value operation on the rotating speed of the wind turbine and a rotating speed reference instruction of the wind turbine to obtain a rotating speed difference value of the wind turbine, and the rotating speed difference value of the wind turbine is subjected to a fan blade pitch angle control instruction through a PI (proportional integral) controller;
the rotation speed difference value operation submodule of the diesel generator is used for carrying out difference value operation on the rotation speed of the diesel generator and a rotation speed reference instruction of the diesel generator to obtain a rotation speed difference value of the diesel generator, and the rotation speed difference value of the diesel generator is subjected to primary frequency modulation power instruction through an inertia controller;
the active power difference value operation submodule of the diesel generator is used for carrying out difference value operation on the active power of the diesel generator and an active power reference instruction of the diesel generator to obtain an active power difference value of the diesel generator, and the active power difference value of the diesel generator is subjected to a constant power control instruction of the diesel generator through a PI (proportional-integral) controller and a slope limiter;
the bus voltage difference value operation submodule is used for carrying out difference value operation on the bus voltage and the reference instruction of the bus voltage to obtain a bus voltage difference value, and carrying out difference value operation on the reactive power of the diesel generator and the reactive power reference instruction of the diesel generator to obtain a reactive power difference value of the diesel generator; and the bus voltage difference value and the reactive power difference value of the diesel generator are subjected to PI controller to obtain a reactive power instruction output by the fan grid side converter.
9. The offshore wind farm large island mode wind turbine and diesel generator cooperative control system according to claim 7, wherein the related parameter obtaining module comprises:
the rotating speed acquisition submodule of the wind turbine is used for measuring the rotating speed of the wind turbine and inputting the real-time rotating speed of the wind turbine into a pitch angle controller of the wind turbine;
the rotating speed acquisition submodule of the diesel generator is used for measuring the rotating speed of the diesel generator and inputting the rotating speed of the diesel generator into the side converter controller of the fan machine;
the output reactive power measurement value acquisition submodule of the generator is used for measuring the output reactive power measurement value of the diesel generator and inputting the output reactive power measurement value of the diesel generator into a grid-side converter controller of the wind driven generator;
and the bus voltage acquisition submodule is used for measuring the bus voltage and inputting the bus voltage into a grid-side converter controller of the wind driven generator.
10. The offshore wind farm large island mode wind turbine and diesel generator cooperative control system according to claim 7, wherein the control module comprises:
the fan blade pitch angle control submodule is used for adjusting the fan blade pitch angle according to the fan blade pitch angle control instruction so as to realize slow adjustment of the fan blade;
the fan output active power control submodule is used for adjusting the fan output active power according to the wind-diesel cooperative active power control instruction and the secondary frequency modulation power instruction;
and the fan output reactive power control submodule is used for adjusting the fan output reactive power according to the fan grid side converter output reactive power instruction.
CN202010658638.XA 2020-07-09 2020-07-09 Offshore wind driven generator and diesel generator cooperative control method and system Pending CN111900759A (en)

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Application publication date: 20201106