WO2023087535A1 - 基于新能源支撑机与储能装置的调频方法、装置、系统及新能源场站 - Google Patents

基于新能源支撑机与储能装置的调频方法、装置、系统及新能源场站 Download PDF

Info

Publication number
WO2023087535A1
WO2023087535A1 PCT/CN2022/072980 CN2022072980W WO2023087535A1 WO 2023087535 A1 WO2023087535 A1 WO 2023087535A1 CN 2022072980 W CN2022072980 W CN 2022072980W WO 2023087535 A1 WO2023087535 A1 WO 2023087535A1
Authority
WO
WIPO (PCT)
Prior art keywords
frequency
new energy
energy storage
storage device
frequency modulation
Prior art date
Application number
PCT/CN2022/072980
Other languages
English (en)
French (fr)
Inventor
孙华东
李文锋
张健
郭强
魏巍
Original Assignee
中国电力科学研究院有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中国电力科学研究院有限公司 filed Critical 中国电力科学研究院有限公司
Priority to AU2022391351A priority Critical patent/AU2022391351A1/en
Priority to EP22894083.9A priority patent/EP4395096A1/en
Publication of WO2023087535A1 publication Critical patent/WO2023087535A1/zh

Links

Images

Classifications

    • 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
    • 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
    • H02J3/30—Arrangements for balancing of the load in a network by storage of energy using dynamo-electric machines coupled to flywheels
    • 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
    • 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
    • H02J3/48—Controlling the sharing of the in-phase component
    • 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

Definitions

  • the present invention was proposed in a Chinese patent application with the application number 202111372645.4, the application date is November 19, 2021, and the application name is "Frequency Modulation Method Based on New Energy Support Machine and Energy Storage Device and New Energy Station", and requires the Chinese The priority of the patent application, the entire content of the Chinese patent application is hereby incorporated into the present invention as a reference.
  • the invention belongs to the technical field of power system operation and control, and specifically relates to a frequency modulation method, device, system and new energy station based on a new energy support machine and an energy storage device.
  • new energy support machines and energy storage devices are installed to deal with the voltage, inertia and frequency regulation problems of the power system.
  • the expected life of the energy storage device is greater than 10 years, and the life of the charge-discharge cycle of the lithium battery in the energy storage device is roughly on the order of 3500 times. How to ensure the safe operation of energy storage devices and play their role in the power grid within the expected life span is an urgent problem to be solved.
  • the invention provides a frequency modulation method, device, system and new energy station based on a new energy support machine and an energy storage device, aiming at realizing safe operation of the energy storage device and improving its use safety.
  • the present invention provides a frequency modulation method based on a new energy support machine and an energy storage device
  • the new energy support machine is connected to the new energy grid-connected point
  • the energy storage device is connected to the new energy grid-connected point
  • the methods include:
  • the frequency regulation plan generate a frequency regulation command for the new energy support machine and/or the energy storage device, so that the new energy support machine and/or the energy storage device execute the corresponding frequency regulation command, and adjust the system frequency.
  • the determining the frequency modulation scheme for the new energy support machine and/or the energy storage device according to the system frequency offset value includes:
  • a first frequency regulation scheme is determined, and the first frequency regulation scheme includes: controlling the input of the new energy supporting machine.
  • it further includes: according to the first frequency modulation scheme, generating a first active power adjustment instruction for the new energy support machine in the first frequency modulation area, so that the new energy support machine Executing the first active power adjustment command to adjust the system frequency by controlling the new energy supporting machine to increase or decrease the rotational speed.
  • the determining the frequency modulation scheme for the new energy support machine and/or the energy storage device according to the system frequency offset value includes:
  • a second frequency modulation scheme is determined, and the second frequency modulation scheme includes: controlling the input of the new energy supporting machine , and controlling the input of the energy storage device;
  • the first frequency control threshold is a positive number; the second frequency control threshold is a positive number greater than the first frequency control threshold.
  • it further includes: according to the second frequency modulation scheme, generating a first active power adjustment command for the new energy support machine in the second frequency modulation area, so that the new energy support machine Execute the first active power adjustment instruction, and adjust the system frequency by controlling the new energy supporting machine to increase or decrease the rotational speed;
  • a second active power regulation command for the energy storage device is generated, so that the energy storage device executes the first active power regulation command, and by controlling the Can charge or discharge the device to adjust the system frequency.
  • the method further includes:
  • the method further includes:
  • the expected active power command value of the energy storage corresponding to the second active power adjustment command is corrected according to the state of charge of the energy storage device.
  • the present invention provides a frequency modulation device based on a new energy support machine and an energy storage device,
  • the new energy support machine is connected to the new energy grid-connected point
  • the energy storage device is connected to the new energy grid-connected point
  • the devices include:
  • the obtaining part is configured to obtain a system frequency offset value
  • the processing part is configured to determine a frequency modulation scheme for the new energy supporting machine and/or the energy storage device according to the system frequency offset value;
  • the frequency regulation plan generate a frequency regulation command for the new energy support machine and/or the energy storage device, so that the new energy support machine and/or the energy storage device execute the corresponding frequency regulation command, and adjust the system frequency.
  • the processing part is further configured to determine a first frequency modulation scheme when it is detected that the absolute value of the system frequency offset value is not greater than a first frequency control threshold, and the first The frequency modulation scheme includes: controlling the input of the new energy supporting machine.
  • the processing part is further configured to generate a first active power adjustment command for the new energy support machine in the first frequency modulation area according to the first frequency modulation scheme, so that The new energy supporting machine executes the first active power adjustment instruction, and adjusts the system frequency by controlling the new energy supporting machine to increase or decrease the rotating speed.
  • the processing part is further configured to determine the second frequency modulation when it is detected that the absolute value of the system frequency offset value is greater than the first frequency control threshold and less than the second frequency control threshold scheme, the second frequency modulation scheme includes: controlling the input of the new energy supporting machine and controlling the input of the energy storage device;
  • the first frequency control threshold is a positive number; the second frequency control threshold is a positive number greater than the first frequency control threshold.
  • the processing part is further configured to generate a first active power adjustment instruction for the new energy support machine in the second frequency adjustment area according to the second frequency adjustment scheme, so that The new energy support machine executes the first active power adjustment instruction, and adjusts the system frequency by controlling the new energy support machine to increase or decrease the speed;
  • a second active power regulation command for the energy storage device is generated, so that the energy storage device executes the first active power regulation command, and by controlling the Can charge or discharge the device to adjust the system frequency.
  • the processing part is further configured to correct the expected active power command value of the new energy support machine corresponding to the first active power adjustment command according to the rotation speed of the new energy support machine.
  • the processing part is further configured to correct the expected active power command value of the energy storage corresponding to the second active power adjustment command according to the state of charge of the energy storage device.
  • the present invention provides a power grid frequency regulation system based on new energy support machines and energy storage devices, including:
  • the frequency modulation device based on the new energy support machine and the energy storage device described in any one of the second aspect;
  • the new energy support machine control part is configured to obtain the corresponding frequency modulation instruction from the processing part, and control the new energy support machine to execute the corresponding frequency modulation instruction;
  • the energy storage device control part is configured to obtain a corresponding frequency regulation instruction from the processing part, and control the energy storage device to execute the corresponding frequency regulation instruction.
  • the present invention provides a new energy station, including:
  • New energy power generation equipment which is connected to the power grid at the new energy grid connection point;
  • a new energy support machine the new energy support machine is connected to the new energy grid-connected point;
  • An energy storage device the energy storage device is connected to the new energy grid-connected point;
  • the frequency modulation method based on the new energy support machine and the energy storage device provided by the present invention obtains the system frequency offset value, and determines the frequency for the new energy support machine and/or the energy storage device according to the system frequency offset value. frequency modulation scheme, and according to the frequency modulation scheme, generate a frequency modulation instruction for the new energy support machine and/or the energy storage device, so that the new energy support machine and/or the energy storage device perform corresponding Frequency modulation command to adjust the system frequency.
  • the method determines a frequency modulation scheme for the new energy supporting machine and/or the energy storage device according to the system frequency offset value, so that the new energy supporting machine and/or can be adjusted according to a pre-designed control strategy Whether or not the energy storage device participates in the frequency regulation of the power grid has strong regularity, flexible rule adjustment, and good real-time performance, which can realize the safe operation of the energy storage device and improve its use safety.
  • the new energy support machine with better durability is preferentially selected to provide support for the power grid. Only when the system frequency fluctuates too much, electrochemical energy storage devices with poor durability are selected to jointly provide support for the grid, thereby reducing the number of times the electrochemical energy storage devices are put into operation. Under the premise that the total number of charging and discharging cycles remains unchanged during the life cycle of the electrochemical energy storage device, actively reduce the input times of the electrochemical energy storage device from the level of the overall frequency modulation control strategy, thereby prolonging the use of the electrochemical energy storage device in new energy. Service time in the station. This investment strategy optimizes the equipment operation system, prolongs the service time of the equipment, and effectively ensures the support to the power grid with high reliability, which is conducive to the long-term stable operation of new energy stations.
  • FIG. 1 is a schematic flow diagram of a frequency modulation method based on a new energy support machine and an energy storage device according to an embodiment of the present invention
  • Fig. 2 is a schematic diagram of a frequency modulation area realized by a frequency modulation method based on a new energy support machine and an energy storage device according to an embodiment of the present invention
  • Fig. 3 is a schematic diagram of the control information flow of the power grid frequency regulation system based on the new energy support machine and the energy storage device according to the embodiment of the present invention
  • Fig. 4 is a schematic composition diagram of a power grid frequency regulation system based on a new energy support machine and an energy storage device according to an embodiment of the present invention
  • Fig. 5 is a schematic diagram of constant DC voltage control of a grid-side converter under a power grid frequency modulation system based on a new energy support machine and an energy storage device according to an embodiment of the present invention
  • Fig. 6 is a schematic diagram of constant reactive power control of a grid-side converter under a power grid frequency modulation system based on a new energy support machine and an energy storage device according to an embodiment of the present invention
  • Fig. 7 is a schematic diagram of the constant active power control of the machine-side converter under the power grid frequency modulation system based on the new energy support machine and the energy storage device according to the embodiment of the present invention
  • Fig. 8 is a schematic diagram of the constant reactive power control of the machine-side converter under the power grid frequency modulation system based on the new energy support machine and the energy storage device according to the embodiment of the present invention
  • Fig. 9 is a schematic composition diagram of a frequency modulation device based on a new energy support machine and an energy storage device according to an embodiment of the present invention.
  • SOC State of charge, state of charge, referred to as SOC.
  • Jiangsu Kunshan Energy Storage Power Station is the electrochemical energy storage power station with the largest capacity in China. It is a 100-megawatt battery energy storage power station.
  • the 35kV line is connected to the 35kV side of the 220kV Kunshan Substation.
  • the power grid fails, it can realize the millisecond-level response of 100,000 kilowatts load, thus ensuring the safe and stable operation of the power grid.
  • the power system In order to ensure the safe operation of the power system, when the system frequency is lower than the set threshold (the lowest frequency for safe operation of the power system), the power system will automatically cut off unimportant loads, that is, low-frequency load shedding; when the system frequency is higher than the set When the threshold value (the highest frequency for safe operation of the power system) is reached, the power system will automatically cut off generator sets, new energy sets, etc., that is, high-frequency cut-off.
  • the lowest frequency for safe operation of the power system is the lower limit of the allowable frequency deviation range of the power system; the highest frequency for safe operation of the power system is the upper limit of the allowable frequency deviation range for the power system.
  • the system frequency offset value involved in the following is not greater than the deviation (positive value) between the highest frequency and the system rated frequency during safe operation of the power system, and not less than the deviation between the lowest frequency and the system rated frequency during safe operation of the power system ( is a negative value).
  • the embodiment of the present invention provides a frequency modulation method based on a new energy support machine and an energy storage device, include:
  • Step S110 Obtain a system frequency offset value
  • Step S120 According to the system frequency offset value, determine the frequency modulation scheme for the new energy support machine and/or energy storage device;
  • Step S130 According to the frequency regulation plan, generate a frequency regulation command for the new energy support machine and/or the energy storage device, so that the new energy support machine and/or the energy storage device execute the corresponding frequency regulation command to adjust the system frequency.
  • the frequency modulation scheme for the new energy support machine and/or energy storage device is determined, including:
  • a first frequency modulation scheme is determined, and the first frequency modulation scheme includes: controlling input of new energy supporting machines.
  • a first active power adjustment command for the new energy support machine is generated, so that the new energy support machine executes the first active power adjustment command, and by controlling The new energy support machine increases or decreases the speed to adjust the system frequency.
  • the second frequency modulation scheme when it is detected that the absolute value of the system frequency offset value is greater than the first frequency control threshold and less than the second frequency control threshold, the second frequency modulation scheme is determined, and the second frequency modulation scheme includes: controlling the new energy The support machine is put into operation, and the energy storage device is controlled to be put into operation; wherein, the first frequency control threshold is a positive number; the second frequency control threshold is a positive number greater than the first frequency control threshold.
  • a first active power adjustment instruction for the new energy support machine is generated, so that the new energy support machine executes the first active power adjustment instruction, by controlling The new energy support machine increases or decreases the rotational speed to adjust the system frequency;
  • a second active power adjustment instruction for the energy storage device is generated, so that the energy storage device performs the first active power adjustment Instructions to adjust the system frequency by controlling the charging or discharging of the energy storage device.
  • f1 is the first frequency control threshold
  • f2 is the second frequency control threshold.
  • a second frequency modulation scheme is generated to control the energy storage device and new energy support The machines are put into operation respectively, and a frequency modulation of the current round is performed.
  • the first frequency modulation scheme is generated, the input of new energy support machines is controlled, and a frequency modulation of the current round is performed.
  • the new energy support machine when the system frequency fluctuates, when the system frequency offset value is in the first frequency modulation area, the new energy support machine is put into operation; when the system frequency offset value is in the second frequency modulation area, the new energy support machine is simultaneously The machine and the electrochemical energy storage device are put into the power grid, and a frequency regulation is performed respectively.
  • the first frequency modulation scheme in the first frequency modulation area, after generating the first active power adjustment instruction for the new energy support machine, it also includes:
  • the second frequency modulation scheme in the second frequency modulation area, after generating the second active power adjustment command for the energy storage device, further include:
  • the expected active power command value of the energy storage corresponding to the second active power adjustment command is corrected.
  • the centralized controller is set in the new energy station and connected to the busbar of the AC power grid through a control point.
  • the centralized controller is used to separately control the electrochemical energy storage device and the new energy supporting machine.
  • the centralized controller is also used to read the system frequency f of the AC power grid, read the rotor speed N1 of the doubly-fed asynchronous motor and the state of charge SOC of the energy storage device.
  • the aforementioned frequency modulation device that is, the centralized controller shown in FIG.
  • the useful power adjustment instruction P of the superior dispatching department generates a frequency modulation instruction, which includes: the first active power adjustment instruction ⁇ P1 for sending to the new energy support machine control substation, and the first active power adjustment instruction ⁇ P1 for sending to the electrochemical energy storage control substation The second active power adjustment instruction ⁇ P2.
  • the new energy support machine control substation responds to the first active power adjustment command ⁇ P1, controls the new energy support machine to adjust the active power PS and electric energy interacted between its stator and the grid by adjusting the rotor speed, and finally adjusts the system frequency.
  • the energy storage control substation controls the electrochemical energy storage device to adjust the electric energy or active power interacted with the grid by adjusting its state of charge SOC, so as to finally adjust the system frequency.
  • the new energy support machine control substation is provided with a control device 1, and the energy storage control substation is provided with a control device 2, which are respectively used to receive and control the execution of the new energy support machine At least one of the active power command value ⁇ P 10 and the stored active power command value ⁇ P 20 .
  • the control substation of the new energy support machine is also equipped with a collection device 1 and a collection device 2, which are used to collect the system frequency and the rotor speed N 1 of the doubly-fed asynchronous motor, respectively.
  • the energy storage control substation is also provided with a collection device 3 and a collection device 4, which are used to collect the system frequency and the SOC of the electrochemical energy storage device respectively.
  • the energy storage control substation is also provided with a DC/AC converter for converting the active power command value ⁇ P 20 of the energy storage received by the control device 2 into power levels.
  • the new energy support machine is set near the grid connection point of the new energy station, including: main transformer, excitation transformer, double-fed asynchronous motor, frequency converter, acquisition device 1 and Control device 1.
  • the main transformer is used to convert the voltage to a voltage value that matches the stator of the double-fed asynchronous motor.
  • the primary side of the main transformer is connected to the AC grid, and the secondary side of the main transformer is connected to the stator of the double-fed asynchronous motor. connect.
  • the frequency converter includes a machine-side converter (composed of AC-DC links) and a grid-side converter (composed of AC-DC links). Both the grid-side converter and the generator-side converter are fully-controlled converters.
  • the control mode adopted in the embodiment of the present invention is: the grid-side converter adopts constant DC voltage control and constant reactive power control, and the generator-side converter controls The method is constant active power and constant reactive power control, and the specific control objectives and control instructions are determined by the control device 1 .
  • the excitation transformer is used to transform the voltage to a voltage value that matches the grid-side converter.
  • the machine-side converter is connected to the rotor side of the doubly-fed asynchronous machine.
  • E dcref is the reference value of the DC side voltage of the inverter
  • E dc is the DC side voltage of the inverter
  • Kpd is the DC voltage of the grid-side converter Control proportional link constant
  • K id is the DC voltage control integral link constant of the grid-side converter
  • s is the Laplacian operator
  • I gdmax and I gdmin are the current upper limit of the grid-side converter DC voltage control link
  • the current lower limit value, I gdref is the d-axis reference current output by the DC voltage control link of the grid-side converter.
  • E dcref and E dc are input to the grid-side converter together, E dcref is positively input, E dc is negatively input, after K pd processing and After processing, it is output in the forward direction, and after I gdmax and I gdmin processing, I gdref is obtained.
  • the schematic diagram of the constant reactive power control of the grid-side converter is shown in Fig. 6,
  • Qgref is the reference value of the reactive power of the grid-side converter
  • Qg is the reactive power of the grid-side converter
  • Kgd is the grid-side converter
  • K ig is the integral link constant of reactive power control of grid-side converter
  • I gqmax and I gqmin are the current upper limit and current lower limit of reactive power control link of grid-side converter respectively value
  • I gqref is the q-axis reference current output by the reactive power control link of the grid-side converter.
  • Q gref and Q g are input to the grid-side converter together, Q gref is positively input, Q g is negatively input, after K gd processing and After processing, output in the forward direction, and get I gqref after I gqmax and I gqmin processing.
  • f is the frequency of the AC grid
  • f ref is the frequency reference value
  • ⁇ f is the difference between the frequency and the rated value
  • ⁇ f' is the frequency change rate
  • K p is the droop
  • P max and P min are the maximum and minimum values of the active power command limiting link of the machine-side converter, respectively
  • P ref is the active power command of the machine-side converter.
  • P f is the additional power command for the additional primary frequency modulation control of the doubly-fed condenser
  • P int is the additional power control command for the additional inertia control of the doubly-fed condenser.
  • f ref and f are input to the grid-side converter together, f ref is input positively and f is negatively input, and ⁇ f is obtained, and ⁇ f' is obtained after dead zone processing, and after K p processing and P max and After P min is processed, Pre ref is obtained.
  • V t is the grid-connected point voltage of the DFIG
  • V ref is the reference voltage
  • I t is the grid-connected current of the DFIG
  • X c is Additional compensating reactance
  • U c is the grid-connected point voltage of the DFIG after additional compensation
  • T r is the time constant of the filter link
  • T 1 and T 2 are the time constants of the first series correction link
  • T 3 and T 4 are the time constants of the second series correction link
  • K is the DC gain of the series correction link
  • K a is the gain of the amplification link
  • T a is the time constant of the amplification link
  • Q max and Q min are the upper and lower limits of the reactive power reference value
  • Q ref is the reactive power reference value.
  • the doubly-fed asynchronous motor is a wound asynchronous motor whose rotor is AC excited.
  • the stator current frequency f is the same as the system frequency f of the AC grid.
  • the control device 1 is used to provide support to the grid by controlling the rotor speed N1 of the doubly-fed asynchronous motor when the system frequency f fluctuates. For example, when the grid frequency f decreases due to an increase in load or a decrease in power generation, by reducing the rotor speed of the doubly-fed asynchronous motor, the reduced kinetic energy of the doubly-fed asynchronous motor will flow through the rotor and stator in turn and then be injected into the grid. That is, the new energy support machine injects energy into the grid.
  • the new energy support machine absorbs energy from the grid.
  • the control device 2 is used to provide support to the grid by controlling the increase or decrease of the SOC of the energy storage device when the system frequency f fluctuates. For example, when the grid frequency decreases due to an increase in load or a decrease in generated power, by controlling the SOC of the energy storage device to reduce, the reduced electric energy of the energy storage device is injected into the grid, that is, the energy storage device injects energy into the grid. For example, when the grid frequency increases due to load reduction or power generation increase, by controlling the increase of the SOC of the energy storage device, the abundant electric energy in the grid is stored as the electric energy of the energy storage device, that is, the energy storage device absorb energy.
  • the absolute value of the system frequency offset value acquired by the frequency modulation device is 0.6 Hz. 0.6Hz is less than the first frequency control threshold of 1.0Hz (that is, the new energy operation frequency deviation threshold), and less than the second frequency control threshold of 1.5Hz (for example, the system safety frequency threshold.
  • the frequency modulation device detects the absolute value of the system frequency deviation value
  • the first frequency regulation scheme is determined, and the first frequency regulation scheme includes: controlling the input of new energy supporting machines.
  • the frequency modulation device controls the input of the new energy support machine, including: generating the first active power adjustment command ⁇ P1, so that the new energy support machine control substation responds to the first active power adjustment command ⁇ P1, and controls the new energy support machine by adjusting its rotor speed to adjust The active power PS and electric energy interacted between its stator and the grid to finally adjust the system frequency.
  • system frequency is adjusted by controlling the rotor of the new energy support machine to increase or decrease the rotational speed so that the new energy support machine executes the first active power adjustment command ⁇ P1.
  • generating the first active power adjustment command ⁇ P1 includes: calculating the expected active power command value ⁇ P 10 of the new energy supporting machine:
  • ⁇ f 01 is the frequency response dead zone, and its value is a positive number, such as 0.01Hz; K1 is the frequency-active power coefficient of the new energy support machine, and its value is a negative number, such as -1MW/Hz; The absolute value of ⁇ f is greater than ⁇ f 01 .
  • the expected active power command value ⁇ P 10 of the above-mentioned new energy support machine is sent to the new energy source by the station-level controller through communication equipment (wired or wireless)
  • the control device of the support machine (such as the control device 1 in Figure 4) is executed by it.
  • the control device of the new energy support machine controls the new energy support machine to release its rotational kinetic energy or increase its rotational kinetic energy according to the expected active power command value of the new energy support machine according to the obtained new energy support machine's expected active power command value ⁇ P 10 , That is to control the new energy support machine to reduce or increase the speed to inject energy into the grid or absorb energy from the grid.
  • the method and steps of controlling the new energy supporting machine to adjust its rotating speed will not be repeated here.
  • the control device of the new energy support machine calculates the received The expected active power command value of the new energy support machine is corrected.
  • correcting the expected active power command value of the new energy supporting machine includes: according to the obtained rotor speed ⁇ (corresponding to N 1 in Fig. 4 ), using the following formula to correct the new energy supporting machine
  • the expected active power command value ⁇ P 10 , and the first executed active power command value ⁇ P 11 is obtained:
  • ⁇ max and ⁇ min are the upper limit of the speed of the new energy support machine, that is, the maximum speed, and the lower limit of the speed, that is, the minimum speed.
  • the generated expected active power command value ⁇ P 10 of the new energy supporting machine is a negative value.
  • the speed ⁇ of the new energy supporting machine is higher than the upper limit of the speed at this time, and is limited by the maximum speed, it is necessary to determine that the first executed active power command value is 0.
  • the issued first active power command value is zero, and the new energy support machine is controlled not to exchange energy with the grid.
  • the first executed active power command value ⁇ P 11 is executed.
  • the generated expected active power command value ⁇ P10 of the new energy supporting machine is a positive value.
  • the rotational speed ⁇ of the rotor of the doubly-fed asynchronous motor is lower than the lower limit of the rotational speed and is limited by the minimum rotational speed, the first executed active power command value needs to be corrected to be 0.
  • the issued active power command value of the first motor is zero, and the new energy support machine is controlled not to exchange energy with the grid.
  • the first executed active power command value ⁇ P11 is executed.
  • the control method of double-fed asynchronous motor refer to CN111193273B and CN111262254B.
  • the above steps of correcting the expected active power command value of the new energy support machine are performed by the substation side.
  • the correction may also be performed at the station level, that is, the centralized controller.
  • the centralized controller can obtain the rotational speed of the new energy support machine in advance, and generate the expected active power command value of the new energy support machine according to the obtained rotational speed of the new energy support machine. That is to say, formula (3) and formula (4) are combined into one formula to implement, and details are not repeated here.
  • the absolute value of the system frequency offset obtained by the frequency modulation device is 1.2 Hz. 1.2 Hz is greater than the first frequency control threshold and less than the second frequency control threshold of 1.5 Hz (for example, less than the system safety frequency threshold).
  • the frequency modulation device detects that the absolute value of the system frequency offset value is greater than the first frequency control threshold and less than the second frequency control threshold, it determines the second frequency modulation scheme.
  • the second frequency modulation scheme includes: controlling the input of new energy supporting machines, controlling energy storage Device input.
  • the frequency modulation device controls the input of the new energy supporting machine, which is similar to that in the above-mentioned embodiment, and will not be repeated here.
  • the frequency modulation device controls the energy storage device, including: generating a second active power adjustment instruction ⁇ P2, so that the electrochemical energy storage device responds to the first active power adjustment instruction ⁇ P2, and controls the electrochemical energy storage device to adjust its state of charge SOC.
  • the electrical energy or active power that interacts with the grid to ultimately regulate the system frequency.
  • system frequency is adjusted by controlling the energy storage device to charge or discharge so that the energy storage device executes the second active power adjustment instruction ⁇ P2.
  • generating the second active power adjustment command ⁇ P2 includes: calculating the expected active power command value ⁇ P 20 of the energy storage:
  • ⁇ f 02 is the frequency response dead zone, its value is a positive number, such as 0.02Hz; K 2 is the energy storage frequency-active power coefficient, its value is a negative number, such as -1M W/Hz; ⁇ The absolute value of f is greater than ⁇ f 02 .
  • ⁇ P 20 When the system frequency offset value is positive, ⁇ P 20 is a negative value, that is, by controlling the energy storage device to absorb and store electric energy, energy is absorbed from the grid, thereby reducing the system frequency and system frequency offset value.
  • ⁇ P 20 When the system frequency offset value is negative, ⁇ P 20 is a positive value, that is, by controlling the energy storage device to release and reduce electric energy, energy is injected into the grid, thereby increasing the system frequency and reducing the system frequency offset value.
  • the expected active power command value ⁇ P 20 of the above energy storage is sent by the centralized controller to the control of the electrochemical energy storage device through the communication equipment (wired or wireless) device (such as the control device 2 in Figure 4) and is executed by it.
  • the control device of the electrochemical energy storage device controls the energy storage device to release its electric energy or store electric energy according to the expected active power instruction value of energy storage ⁇ P20 , that is, the SOC of the electrochemical energy storage device Decrease to inject energy into the grid or increase the SOC of the electrochemical energy storage device to absorb energy from the grid.
  • the method and steps of controlling the energy storage device to adjust its SOC to adjust the active power and electric energy will not be repeated here.
  • the control device of the electrochemical energy storage device responds to the received SOC upper limit and the lower limit of the SOC of the energy storage device The expected active power command value of the energy storage is corrected.
  • correcting the expected active power command value of the energy storage includes: according to the obtained SOC of the energy storage device, using the following formula to correct the expected active power command value of the energy storage ⁇ P 20 , to get the second executed active power command value ⁇ P 22 :
  • SOC max and SOC min are the upper limit value of the state of charge and the lower limit value of the state of charge of the electrochemical energy storage device, respectively.
  • the generated expected active power command value ⁇ P 20 of the energy storage is a negative value.
  • the state of charge of the energy storage device is higher than the upper limit value of the state of charge, it is necessary to determine the second execution active power command value to be 0 for the safety of the energy storage device.
  • the issued second active power command value is zero, and the electrochemical energy storage device is controlled not to exchange energy with the grid.
  • the received expected active power command value ⁇ P 20 for energy storage is not executed but the second executed active power command value ⁇ P 22 is executed.
  • the generated expected active power command value ⁇ P 20 of the energy storage is a positive value.
  • the state of charge of the energy storage device is lower than the lower limit value of the state of charge of the energy storage device at this time, for the safety of the energy storage device, it is necessary to determine that the second execution active power command value is 0.
  • the issued second active power command value is zero, and the electrochemical energy storage device is controlled not to exchange energy with the grid.
  • the received expected active power command value ⁇ P 20 for energy storage is not executed but the second executed active power command value ⁇ P 22 is executed.
  • the above steps of correcting the expected active power command value of the electrochemical energy storage are performed by the substation side.
  • the correction may also be performed at the station level, that is, the centralized controller.
  • the centralized controller may obtain the state of charge of the energy storage device in advance, and generate an expected active power command value of the energy storage according to the obtained state of charge of the energy storage device. That is to say, formula (5) and formula (6) are combined into one formula to realize, and no more details are given here.
  • multiple new energy supporting machines may be installed near the new energy station, and multiple sets of electrochemical energy storage devices may also be installed.
  • multiple new energy support machines can be equivalent to one new energy support machine, and multiple sets of energy storage devices can be equivalent to one energy storage device.
  • the aforementioned frequency modulation method is still used to perform frequency modulation control for new energy stations, thereby improving the operational safety of the energy storage device.
  • the centralized controller within one execution cycle of the frequency modulation control strategy, the centralized controller generates active power to be delivered to the energy storage control sub-station and/or the new energy control sub-station respectively according to various physical quantity data obtained.
  • Adjustment instructions that is, frequency modulation instructions.
  • the centralized controller reads the frequency f of the AC system, reads the rotor speed ⁇ (N 1 in Fig. 3 ) of the doubly-fed asynchronous motor and the SOC of the energy storage device.
  • the centralized controller reads the active power control mode and/or useful power adjustment instruction P issued by the superior dispatching department. There can be one or more centralized controllers. The centralized controller can issue active power control methods and/or active power control command values P to one or more groups of energy storage control sub-stations and/or new energy supporting machine control sub-stations.
  • the centralized controller judges whether the absolute value of the system frequency offset value is greater than the first frequency control threshold f 1 according to the acquired system frequency f. If it is greater than the first frequency deviation threshold f 1 , go to step (4), otherwise go to step (7).
  • the system frequency offset value can be positive or negative according to the difference between the current system frequency and the rated frequency of the power grid.
  • the centralized controller judges whether the system frequency offset is smaller than the second frequency offset threshold f 2 . If it is less than the second frequency deviation threshold f 2 , go to step (5); otherwise, go to step (10).
  • the second frequency deviation threshold is a positive number greater than the first frequency deviation threshold. Therefore, only when the system frequency offset exceeds the first frequency offset threshold, it is necessary to turn to step (4) to further determine whether it is smaller than the second frequency offset threshold. If the system frequency offset value does not exceed the first frequency offset threshold, then directly go to step (7) to execute the steps for the first frequency modulation zone.
  • the second frequency deviation threshold may be a system safety frequency threshold, or may be a smaller value.
  • the centralized controller issues active power adjustment commands ⁇ P 10 and ⁇ P 20 to the control device 2 and/or the control device 1, and returns to step (1).
  • corresponding frequency modulation measures are implemented according to the severity of system frequency fluctuations. For example, when the degree of severity is low, it is in the first frequency regulation area, and steps (5) to (9) are performed, and a new energy supporting machine is used for frequency regulation. For example, when the severity is high, it is in the second frequency modulation area, and steps (7) to (9) are performed, and a new energy support machine and an electrochemical energy storage device are put into the frequency modulation at the same time.
  • the frequency modulation device 900 based on the new energy support machine and the energy storage device in the embodiment of the present invention includes:
  • the obtaining part 910 is configured to obtain a system frequency offset value
  • the processing part 920 is configured to determine a frequency modulation scheme for the new energy support machine and/or the energy storage device according to the system frequency offset value;
  • a frequency modulation command for the new energy support machine and/or energy storage device is generated, so that the new energy support machine and/or energy storage device executes the corresponding frequency modulation command to adjust the system frequency.
  • the processing part 920 is further configured to determine a first frequency modulation scheme when it is detected that the absolute value of the system frequency offset value is not greater than a first frequency control threshold, the first A frequency modulation scheme includes: controlling the input of the new energy supporting machine.
  • the processing part 920 is further configured to generate a first active power adjustment instruction for the new energy support machine in the first frequency adjustment area according to the first frequency adjustment scheme, so as to The new energy supporting machine executes the first active power adjustment instruction, and the system frequency is adjusted by controlling the new energy supporting machine to increase or decrease the rotational speed.
  • the processing part 920 is further configured to determine the second Frequency modulation scheme, the second frequency modulation scheme includes: controlling the input of the new energy support machine and controlling the input of the energy storage device; wherein, the first frequency control threshold is a positive number; the second frequency control threshold is A positive number greater than the first frequency control threshold.
  • the processing part 920 is further configured to generate a first active power adjustment instruction for the new energy support machine in the second frequency adjustment area according to the second frequency adjustment scheme, so as to Make the new energy support machine execute the first active power adjustment instruction, and adjust the system frequency by controlling the new energy support machine to increase or decrease the speed; according to the second frequency modulation scheme, in the second frequency modulation area, A second active power adjustment instruction for the energy storage device is generated, so that the energy storage device executes the first active power adjustment instruction, and the system frequency is adjusted by controlling charging or discharging of the energy storage device.
  • the processing part 920 is further configured to correct the expected active power command value of the new energy support machine corresponding to the first active power adjustment command according to the rotation speed of the new energy support machine .
  • the processing part 920 is further configured to correct the expected active power command value of the energy storage corresponding to the second active power regulation command according to the state of charge of the energy storage device.
  • the obtaining part is configured to obtain a system frequency offset value
  • the processing part is configured to determine a frequency modulation scheme for the new energy supporting machine and/or the energy storage device according to the system frequency offset value;
  • the frequency modulation plan generate a frequency modulation command for the new energy support machine and/or energy storage device, so that the new energy support machine and/or energy storage device executes the corresponding frequency modulation command to adjust the system frequency;
  • the control part of the new energy support machine is configured to obtain the corresponding frequency regulation instruction from the processing part, and control the new energy support machine to execute the corresponding frequency regulation instruction;
  • the energy storage device control part is configured to obtain a corresponding frequency regulation instruction from the processing part, and control the energy storage device to execute the corresponding frequency regulation instruction.
  • New energy power generation equipment which is connected to the power grid at the new energy grid connection point;
  • New energy support machine the new energy support machine is connected to the new energy grid connection point
  • Electrochemical energy storage device the energy storage device is connected to the grid-connected point of new energy
  • the embodiments of the present invention may be provided as methods, systems, or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions
  • the device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.
  • the embodiment of the invention discloses a frequency modulation method, device, system and new energy station based on a new energy support machine and an energy storage device.
  • the method includes: acquiring a system frequency offset value; determining a frequency modulation scheme for the new energy supporting machine and/or the energy storage device according to the system frequency offset value; A frequency modulation instruction of the new energy support machine and/or the energy storage device, so that the new energy support machine and/or the energy storage device executes a corresponding frequency modulation instruction to adjust the system frequency.
  • the method has strong regularity, flexible rule adjustment and good real-time performance. When the system frequency fluctuates in the power grid, choose to invest in new energy support machines with better durability to provide support for the power grid.
  • the electrochemical energy storage device with poor durability is selected to jointly provide support for the power grid, thereby reducing the number of times the energy storage device is put into operation, realizing the safe operation of the energy storage device and improving its use. safety.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

本发明公开了基于新能源支撑机与储能装置的调频方法、装置、系统及新能源场站。该方法包括：获取系统频率偏移值；根据所述系统频率偏移值，确定针对所述新能源支撑机和/或所述储能装置的调频方案；根据所述调频方案，生成针对所述新能源支撑机和/或所述储能装置的调频指令，以使得所述新能源支撑机和/或所述储能装置执行相应的调频指令，调节系统频率。该方法规则性强，规则调整灵活，实时性好。在电网发生系统频率波动时，选择投入耐久性更好的新能源支撑机来对电网提供支撑。仅在系统频率波动过大时，才选择投入耐久性较差的电化学储能装置来共同对电网提供支撑，从而减少储能装置的投入次数，实现了储能装置安全运行并提高了其使用安全性。

Description

基于新能源支撑机与储能装置的调频方法、装置、系统及新能源场站
相关申请的交叉引用
本发明于申请号为202111372645.4、申请日为2021年11月19日、申请名称为“基于新能源支撑机与储能装置的调频方法及新能源场站”的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本发明作为参考。
技术领域
本发明属于电力系统运行及控制技术领域，具体涉及基于新能源支撑机与储能装置的调频方法、装置、系统及新能源场站。
背景技术
2019年8月9日英国发生大停电事故。事故发生之前，小巴德福(Little Barford)燃气电站正确停机。在损失燃气电站的发电负荷后，北海电网的系统频率降低。而由于北海电网内风电机组耐受低频的能力不足，导致风电机组继发大量脱网，风电场出力骤降，导致系统频率进一步降低，并触发电网低频减载保护动作，切除部分负荷，进而导致大停电事故。
参考以上停电事故，在新能源高占比的电网中，新能源的特征十分明显，新能源并网安全问题十分严峻，特别是在特高压直流送端的近区电网，新能源汇集占比高，集群化明显，电力系统的电压、惯性和调频的问题愈发严重。
目前，在一些新能源汇集占比高的电网中，设置有新能源支撑机和储能装置，用于应对电力系统的电压、惯性和调频问题。通常，储能装置的预期寿命大于10年，而储能装置中锂电池的充放电循环次数寿命大致为3500次量级。在预期寿命内，如何保证储能装置安全运行，并发挥其在电网中的作用，是目前亟需解决的问题。
发明内容
本发明提供基于新能源支撑机与储能装置的调频方法、装置、系统及新能源场站，旨在实现储能装置安全运行及提高其使用安全性。
第一方面，本发明提供一种基于新能源支撑机与储能装置的调频方法，
所述新能源支撑机连接在新能源并网点；
所述储能装置连接在新能源并网点；
所述方法包括：
获取系统频率偏移值；
根据所述系统频率偏移值，确定针对所述新能源支撑机和/或所述储能装置的调频方案；
根据所述调频方案，生成针对所述新能源支撑机和/或所述储能装置的调频指令，以使得所述新能源支撑机和/或所述储能装置执行相应的调频指令，调节系统频率。
在本发明的一些实施例中，所述根据所述系统频率偏移值，确定针对所述新能源支撑机和/或所述储能装置的调频方案，包括：
在检测到所述系统频率偏移值的绝对值不大于第一频率控制阈值时，确定第一调频方案，所述第一调频方案包括：控制所述新能源支撑机投入。
在本发明的一些实施例中，还包括：根据所述第一调频方案，在第一调频区内，生成针对所述新能源支撑机的第一有功调节指令，以使得所述新能源支撑机执行所述第一有功调节指令，通过控制所述新能源支撑机提高转速或降低转速，来调节系统频率。
在本发明的一些实施例中，所述根据所述系统频率偏移值，确定针对所述新能源支撑机和/或所述储能装置的调频方案，包括：
在检测到所述系统频率偏移值的绝对值大于第一频率控制阈值且小于第二频率控制阈值时，确定第二调频方案，所述第二调频方案包括：控制所述新能源支撑机投入、及控制所述储能装置投入；
其中，所述第一频率控制阈值为正数；所述第二频率控制阈值为大于所述第一频率控制阈值的正数。
在本发明的一些实施例中，还包括：根据所述第二调频方案，在第二调频区内，生成针对所述新能源支撑机的第一有功调节指令，以使得所述新能源支撑机执行所述第一有功调节指令，通过控制所述新能源支撑机提高转速或降低转速，来调节系统频率；
根据所述第二调频方案，在第二调频区内，生成针对所述储能装置的第二有功调节指令，以使得所述储能装置执行所述第一有功调节指令，通过控制所述储能装置充电或放电，来调节系统频率。
在本发明的一些实施例中，所述根据所述第一调频方案，第一调频区内，生成针对所述新能源支撑机的第一有功调节指令之后，所述方法还包括：
根据所述新能源支撑机的转速，修正与所述第一有功调节指令对应的新 能源支撑机的预期有功功率指令值。
在本发明的一些实施例中，根据所述第二调频方案，在第二调频区内，生成针对所述储能装置的第二有功调节指令之后，所述方法还包括：
根据所述储能装置的荷电状态，修正与所述第二有功调节指令对应的储能的预期有功功率指令值。
第二方面，本发明提供一种基于新能源支撑机与储能装置的调频装置，
所述新能源支撑机连接在新能源并网点；
所述储能装置连接在新能源并网点；
所述装置包括：
获取部分，被配置为获取系统频率偏移值；
处理部分，被配置为根据所述系统频率偏移值，确定针对所述新能源支撑机和/或所述储能装置的调频方案；
根据所述调频方案，生成针对所述新能源支撑机和/或所述储能装置的调频指令，以使得所述新能源支撑机和/或所述储能装置执行相应的调频指令，调节系统频率。
在本发明的一些实施例中，所述处理部分，还被配置为在检测到所述系统频率偏移值的绝对值不大于第一频率控制阈值时，确定第一调频方案，所述第一调频方案包括：控制所述新能源支撑机投入。
在本发明的一些实施例中，所述处理部分，还被配置为根据所述第一调频方案，在第一调频区内，生成针对所述新能源支撑机的第一有功调节指令，以使得所述新能源支撑机执行所述第一有功调节指令，通过控制所述新能源支撑机提高转速或降低转速，来调节系统频率。
在本发明的一些实施例中，所述处理部分，还被配置为在检测到所述系统频率偏移值的绝对值大于第一频率控制阈值且小于第二频率控制阈值时，确定第二调频方案，所述第二调频方案包括：控制所述新能源支撑机投入、及控制所述储能装置投入；
其中，所述第一频率控制阈值为正数；所述第二频率控制阈值为大于所述第一频率控制阈值的正数。
在本发明的一些实施例中，所述处理部分，还被配置为根据所述第二调频方案，在第二调频区内，生成针对所述新能源支撑机的第一有功调节指令，以使得所述新能源支撑机执行所述第一有功调节指令，通过控制所述新能源支撑机提高转速或降低转速，来调节系统频率；
根据所述第二调频方案，在第二调频区内，生成针对所述储能装置的第二有功调节指令，以使得所述储能装置执行所述第一有功调节指令，通过控 制所述储能装置充电或放电，来调节系统频率。
在本发明的一些实施例中，所述处理部分，还被配置为根据所述新能源支撑机的转速，修正与所述第一有功调节指令对应的新能源支撑机的预期有功功率指令值。
在本发明的一些实施例中，所述处理部分，还被配置为根据所述储能装置的荷电状态，修正与所述第二有功调节指令对应的储能的预期有功功率指令值。
第三方面，本发明提供一种基于新能源支撑机与储能装置的电网调频系统，包括：
在第二方面中说明的任一项所述的基于新能源支撑机与储能装置的调频装置；
新能源支撑机控制部分，被配置为从所述处理部分获取相应的调频指令，并控制所述新能源支撑机执行相应的调频指令；
储能装置控制部分，被配置为从所述处理部分获取相应的调频指令，并控制所述储能装置执行相应的调频指令。
第四方面，本发明提供一种新能源场站，包括：
新能源发电设备，其在新能源并网点并入电网；
新能源支撑机，所述新能源支撑机连接在所述新能源并网点；
储能装置，所述储能装置连接在所述新能源并网点；
如第三方面说明的电网调频系统。
本发明提供的基于新能源支撑机与储能装置的调频方法，获取系统频率偏移值，并根据所述系统频率偏移值，确定针对所述新能源支撑机和/或所述储能装置的调频方案，并根据所述调频方案，生成针对所述新能源支撑机和/或所述储能装置的调频指令，以使得所述新能源支撑机和/或所述储能装置执行相应的调频指令，调节系统频率。该方法根据所述系统频率偏移值，确定针对所述新能源支撑机和/或所述储能装置的调频方案，从而可以根据预先设计的控制策略，调整所述新能源支撑机和/或所述储能装置是否参与本次电网调频，规则性强，规则调整灵活，实时性好，可以实现储能装置安全运行并提高其使用安全性。
可以理解的是，在系统频率波动时，在系统频率偏移值位于第一调频区时，投入新能源支撑机；系统频率偏移值位于第二调频区时，同时将新能源支撑机和电化学储能装置投入到电网中，分别执行一次调频，实现了储能装置安全运行并提高了其使用安全性。
在本发明的一些实施例中，在电网发生系统频率波动时，优先选择投入 耐久性更好的新能源支撑机来对电网提供支撑。仅在系统频率波动过大时，才选择投入耐久性较差的电化学储能装置来共同对电网提供支撑，从而减少电化学储能装置的投入次数。在电化学储能装置的寿命周期内充放电循环总次数不变的前提下，从整体调频控制策略层面来主动减少电化学储能装置的投入次数，进而可以延长电化学储能装置在新能源场站中的服役时间。这种投入策略，优化了设备运行制度，延长了设备的服务时间，有效地保证了以较高的可靠性向电网提供支撑，有利于新能源场站长期稳定运行。
附图说明
图1为本发明实施例的基于新能源支撑机与储能装置的调频方法的流程示意图；
图2是本发明实施例的基于新能源支撑机与储能装置的调频方法实现的调频区示意图；
图3是本发明实施例的基于新能源支撑机与储能装置的电网调频系统的控制信息流转示意图；
图4是本发明实施例的基于新能源支撑机与储能装置的电网调频系统的组成示意图；
图5是本发明实施例的基于新能源支撑机与储能装置的电网调频系统下的网侧变流器定直流电压控制示意图；
图6是本发明实施例的基于新能源支撑机与储能装置的电网调频系统下的网侧变流器定无功功率控制示意图；
图7是本发明实施例的基于新能源支撑机与储能装置的电网调频系统下的机侧变流器定有功功率控制示意图；
图8是本发明实施例的基于新能源支撑机与储能装置的电网调频系统下的机侧变流器定无功功率控制示意图；
图9是本发明实施例的基于新能源支撑机与储能装置的调频装置的组成示意图。
具体实施方式
现在参考附图介绍本发明的示例性实施方式，然而，本发明可以用许多不同的形式来实施，并且不局限于此处描述的实施例，提供这些实施例是为了详尽地且完全地公开本发明，并且向所属技术领域的技术人员充分传达本 发明的范围。对于表示在附图中的示例性实施方式中的术语并不是对本发明的限定。在附图中，相同的单元/元件使用相同的附图标记。
除非另有说明，此处使用的术语(包括科技术语)对所属技术领域的技术人员具有通常的理解含义。另外，可以理解的是，以通常使用的词典限定的术语，应当被理解为与其相关领域的语境具有一致的含义，而不应该被理解为理想化的或过于正式的意义。
以下为部分术语及符号的定义：
荷电状态，state of charge，简称SOC。
目前，江苏昆山储能电站为国内容量最大的电化学储能电站，为百兆瓦级电池储能电站，由8个单体电站组成，总容量101MW，采用磷酸铁锂电池方案，以4回35kV线路接入220kV昆山变35kV侧。在电网发生故障时，可实现10万千瓦负荷毫秒级响应，从而确保电网安全稳定运行。
与江苏昆山储能电站相似，目前已经投入的电化学储能装置大多为大容量交流储能装置。作为电化学装置，随着累计充放电循环次数增加，其性能会逐渐衰减，使用安全性和可靠性也逐渐降低。
为保证电力系统安全运行，在系统频率低于设定的阈值(电力系统安全运行时的最低频率)时，电力系统会自动切除不重要的负荷，也即低频减载；在系统频率高于设定的阈值(电力系统安全运行时的最高频率)时，电力系统会自动切除发电机组、新能源机组等，也即高频切机。
具体实施时，电力系统安全运行的最低频率为电力系统允许的频率偏差范围的下限；电力系统安全运行的最高频率为电力系统允许的频率偏差范围的上限。以下涉及到的系统频率偏移值，不大于电力系统安全运行时的最高频率与系统额定频率的偏差(为正值)，且不小于电力系统安全运行时的最低频率与系统额定频率的偏差(为负值)。
在本发明的一些实施例中，如图1所示，为保证储能装置安全运行，提高其使用安全性，本发明实施例提供了一种基于新能源支撑机与储能装置的调频方法，包括：
步骤S110：获取系统频率偏移值；
步骤S120：根据系统频率偏移值，确定针对新能源支撑机和/或储能装置的调频方案；
步骤S130：根据调频方案，生成针对新能源支撑机和/或储能装置的调频指令，以使得新能源支撑机和/或储能装置执行相应的调频指令，调节系统频率。
在本发明的一些实施例中，根据系统频率偏移值，确定针对新能源支撑 机和/或储能装置的调频方案，包括：
在检测到系统频率偏移值的绝对值不大于第一频率控制阈值时，确定第一调频方案，第一调频方案包括：控制新能源支撑机投入。
在本发明的一些实施例中，根据第一调频方案，在第一调频区内，生成针对新能源支撑机的第一有功调节指令，以使得新能源支撑机执行第一有功调节指令，通过控制新能源支撑机提高转速或降低转速，来调节系统频率。
在本发明的一些实施例中，在检测到系统频率偏移值的绝对值大于第一频率控制阈值且小于第二频率控制阈值时，确定第二调频方案，第二调频方案包括：控制新能源支撑机投入、及控制储能装置投入；其中，第一频率控制阈值为正数；第二频率控制阈值为大于第一频率控制阈值的正数。
在本发明的一些实施例中，根据第二调频方案，在第二调频区内，生成针对新能源支撑机的第一有功调节指令，以使得新能源支撑机执行第一有功调节指令，通过控制新能源支撑机提高转速或降低转速，来调节系统频率；根据第二调频方案，在第二调频区内，生成针对储能装置的第二有功调节指令，以使得储能装置执行第一有功调节指令，通过控制储能装置充电或放电，来调节系统频率。
在本发明的一些实施例中，如图2所示，f1为第一频率控制阈值，f2为第二频率控制阈值。本发明实施例的调频方法，在检测到系统频率偏移值的绝对值大于第一频率控制阈值f1且小于第二频率控制阈值f2时，生成第二调频方案，控制储能装置和新能源支撑机分别投入，执行本轮的一次调频。在检测到系统频率偏移值的绝对值小于第一频率控制阈值f1且小于第二频率控制阈值f2时，生成第一调频方案，控制新能源支撑机投入，执行本轮的一次调频。
本发明实施例的调频方法，在系统频率波动时，在系统频率偏移值位于第一调频区时，投入新能源支撑机；系统频率偏移值位于第二调频区时，同时将新能源支撑机和电化学储能装置投入到电网中，分别执行一次调频。
在电网发生系统频率波动时，选择投入耐久性更好的新能源支撑机来对电网提供支撑。仅在系统频率波动过大时，才选择投入耐久性较差的电化学储能装置来共同对电网提供支撑，从而减少电化学储能装置的投入次数。
在电化学储能装置的寿命周期内充放电循环总次数不变的前提下，从整体调频控制策略层面来主动减少电化学储能装置的投入次数，进而可以延长电化学储能装置在新能源场站中的服役时间。这种投入策略，优化了设备运行制度，延长了设备的服务时间，有效地保证了以较高的可靠性向电网提供支撑，有利于新能源场站长期稳定运行。
在本发明的一些实施例中，根据第一调频方案，第一调频区内，生成针对新能源支撑机的第一有功调节指令之后，还包括：
根据新能源支撑机的转速，修正与第一有功调节指令对应的新能源支撑机的预期有功功率指令值。
在本发明的一些实施例中，根据第二调频方案，在第二调频区内，生成针对储能装置的第二有功调节指令之后，还包括：
根据储能装置的荷电状态，修正与第二有功调节指令对应的储能的预期有功功率指令值。
在本发明的一些实施例中，如图3所示，集中控制器设置在新能源场站中，经控制点连接在交流电网的母线上。该集中控制器用于分别控制电化学储能装置和新能源支撑机。该集中控制器还用于读取交流电网的系统频率f，读取双馈异步电机的转子转速N1和储能装置的荷电状态SOC。
在本发明的一些实施例中，前述的调频装置，也即图3中所示的集中控制器(因设置在场站，也可以称为场站级控制器)根据获取的当前系统频率，和来自上级调度部门的有用功率调节指令P，生成调频指令，该调频指令包括：用于发送至新能源支撑机控制子站的第一有功调节指令ΔP1，用于发送至电化学储能控制子站的第二有功调节指令ΔP2。
新能源支撑机控制子站响应于第一有功调节指令ΔP1，控制新能源支撑机通过调节其转子转速，来调节其定子与电网之间交互的有功功率PS及电能，以最终调节系统频率。
储能控制子站响应于第二频率调节指令ΔP2，控制电化学储能装置通过调节其荷电状态SOC，来调节其与电网之间交互的电能或有功功率，以最终调节系统频率。
在本发明的一些实施例中，如图4所示，新能源支撑机控制子站设置控制装置1，储能控制子站设置有控制装置2，分别用于接收并控制执行新能源支撑机的有功功率指令值△P 10和储能的有功功率指令值△P 20中的至少之一。新能源支撑机控制子站还设置采集装置1和采集装置2，分别用于采集系统频率和双馈异步电机的转子转速N 1。储能控制子站还设置有采集装置3和采集装置4，分别用于采集系统频率和电化学储能装置的荷电状态SOC。储能控制子站还设置有DC/AC变换器，用于将控制装置2接收的储能的有功功率指令值△P 20进行功率级的转换。
在本发明的一些实施例中，如图4所示，新能源支撑机设置在新能源场站的并网点附近，包括：主变压器、励磁变压器、双馈异步电机、变频器、采集装置1和控制装置1。主变压器用于将电压变换到与双馈异步电机的定子 相匹配的电压值，如图4所示，主变压器的一次侧与交流电网连接，主变压器的二次侧与双馈异步电机的定子连接。变频器包括机侧变流器(由交流-直流环节组成)、网侧变流器(由交流-直流环节组成)。网侧变流器和机侧变流器均为全控型变流器。网侧变流器和机侧变流器有多种控制方式，本发明实施例采用的控制方式为：网侧变流器为定直流电压控制和定无功功率控制，机侧变流器控制方式为定有功功率和定无功功率控制，具体的控制目标和控制指令由控制装置1决定。励磁变压器用于将电压变换到与网侧变流器相匹配的电压值。机侧变流器与双馈异步电机的转子侧相连接。
示例性的，网侧变流器定直流电压控制示意图如图5所示，E dcref为变频器直流侧电压参考值，E dc为变频器直流侧电压，K pd为网侧变流器直流电压控制比例环节常数，K id为网侧变流器直流电压控制积分环节常数，s为拉普拉斯算子，I gdmax和I gdmin分别为网侧变流器直流电压控制环节电流上限值和电流下限值，I gdref为网侧变流器直流电压控制环节输出的d轴参考电流。如图5所示，将E dcref和E dc一起输入网侧变流器，E dcref正向输入、E dc负向输入，经过K pd处理和
Figure PCTCN2022072980-appb-000001
处理后正向输出，经过I gdmax和I gdmin处理后，得到I gdref。
网侧变流器定无功功率控制示意图如图6所示，Q gref为网侧变流器无功功率参考值，Q g为网侧变流器无功功率，K gd为网侧变流器无功功率控制比例环节常数，K ig为网侧变流器无功功率控制积分环节常数，I gqmax和I gqmin分别为网侧变流器无功功率控制环节电流上限值和电流下限值，I gqref为网侧变流器无功功率控制环节输出的q轴参考电流。如图6所示，将Q gref和Q g一起输入网侧变流器，Q gref正向输入、Q g负向输入，经过K gd处理和
Figure PCTCN2022072980-appb-000002
处理后正向输出，经过I gqmax和I gqmin处理后，得到I gqref。
机侧变流器定有功功率控制示意图如图7所示，f为交流电网频率，f ref为频率参考值，Δf为频率偏离额定值的差值，Δf'为频率变化率，K p为下垂控制系数，P max和P min分别为机侧变流器有功功率指令限幅环节的最大值和最小值，P ref为机侧变流器的有功功率指令。除了图7所示的参数指标外，还包括：P f为双馈调相机附加一次调频控制的附加功率指令，P int为双馈调相机附加惯量控制的附加功率控制指令。如图8所示，将f ref和f一起输入网侧变流器，f ref正向输入、f负向输入，得到Δf，经过死区处理后得到Δf'，经过K p处理以及P max和P min处理后，得到P ref。
机侧变流器的定无功功率控制示意图如图8所示，V t为双馈调相机并网点电压，V ref为参考电压，I t为双馈调相机的并网电流，X c为附加补偿电抗，
Figure PCTCN2022072980-appb-000003
为附加补偿因数角，U c为经过附加补偿后的双馈调相机并网点电压，T r为滤波环节时间常数，T 1和T 2分别为第一串联校正环节的时间常数，T 3和T 4分别为第二串联校正环节时间常数，K为串联校正环节的直流增益，K v为积分校正环节选择因子，K v＝0时为纯积分校正，K v＝1时为比例积分校正，K a为放大环节增益，T a为放大环节时间常数，Q max和Q min分别为无功功率参考值的上下限，Q ref为无功功率参考值。如图8所示，输入V t和I t，经过
Figure PCTCN2022072980-appb-000004
计算得到U c，再把经过
Figure PCTCN2022072980-appb-000005
处理后的结果负向输出和正向输入的V ref进行和运算，输出第一运算结果，继续
Figure PCTCN2022072980-appb-000006
和
Figure PCTCN2022072980-appb-000007
运算，输出第二运算结果，经过Q max和Q min处理后，得到Q ref。
双馈异步电机为绕线式异步电机，其转子为交流励磁。稳态运行时，定子的电流频率f与交流电网的系统频率f相同。
假设采集装置1检测到的系统频率为f；双馈异步电机的转子转速折合为频率f 1，与机侧变流器相连的三相交流励磁频率为f 2，则有以下关系：
f＝f 1±f 2  (1)
假设双馈异步电机的极对数为p，转子转速N1折合为频率f1，则有以下关系：
f 1＝p*N 1/60  (2)
控制装置1根据采集装置1获取的定子频率f和采集装置2获取的转子转速N1(也即，ω＝πN 1/30)确定系统频率偏移值△f及其绝对值。
在本发明的一些实施例中，如图4所示，控制装置1用于在系统频率f波动时，通过控制双馈异步电机的转子转速N1，向电网提供支撑。如，在电网因负载增加或发电功率减少而导致系统频率f降低时，通过降低双馈异步电机的转子转速，使得双馈异步电机减少的动能依次流经转子及定子后注入到电网内，也即，新能源支撑机向电网注入能量。如，在电网因负载减少或发电功率增加而导致系统频率f升高时，通过提高双馈异步电机的转子转速，使得电网内富裕的电能依次流经定子及转子后，存储为定子的动能，也即，新能源支撑机从电网吸收能量。
在本发明的一些实施例中，如图4所示，控制装置2用于在系统频率f波动时，通过控制储能装置的SOC的增加或减少，向电网提供支撑。例如，在电网因负载增加或发电功率减少而导致系统频率降低时，通过控制储能装置的降低SOC，使得储能装置减少的电能注入到电网内，也即，储能装置向电网注入能量。例如，在电网因负载减少或发电功率增加而导致系统频率升 高时，通过控制储能装置的SOC增加，使得电网内富裕的电能存储为储能装置的电能，也即，储能装置从电网吸收能量。
在本发明的一些实施例中，调频装置获取到的系统频率偏移值的绝对值为0.6Hz。0.6Hz小于第一频率控制阈值1.0Hz(也即新能源动作频率偏差阈值)，且小于第二频率控制阈值1.5Hz(例如，系统安全频率阈值。调频装置在检测到系统频率偏移值的绝对值小于第一频率控制阈值且小于第二频率控制阈值时，确定第一调频方案，第一调频方案包括：控制新能源支撑机投入。
调频装置控制新能源支撑机投入，包括：生成第一有功调节指令ΔP1，以使得新能源支撑机控制子站响应于第一有功调节指令ΔP1，控制新能源支撑机通过调节其转子转速，来调节其定子与电网之间交互的有功功率PS及电能，以最终调节系统频率。
需要说明的是，以使得新能源支撑机执行第一有功调节指令ΔP1，通过控制新能源支撑机的转子提高转速或降低转速，来调节系统频率。
在本发明的一些实施例中，生成第一有功调节指令ΔP1，包括：计算新能源支撑机的预期有功功率指令值△P 10：
Figure PCTCN2022072980-appb-000008
式(3)中，Δf 01为频率响应死区，其值为正数，如，0.01Hz；K1是新能源支撑机频率-有功功率系数，其值为负数，如，-1M W/Hz； Δf的绝对值大于Δf 01。
式(3)中，在系统频率偏移值△f为正值时，其与频率响应死区做减后，得到系统频率调节值；在系统频率偏移值△f为负值时，与频率响应死区做加后，得到系统频率调节值。在不考虑频率响应死区因素时，在式(3)中，将△f 01的值取为零。
式(3)中，在系统频率偏移值△f为正值时，△P 10为负值，也即，通过控制新能源支撑机增加转速，实现从电网中吸收能量，进而减小系统频率及系统频率偏移值。在系统频率偏移值△f为负值时，△P 10为正值，也即，通过控制新能源支撑机降低转速，实现向电网中注入能量，进而增加系统频率及系统频率偏移值。
在本发明的一些实施例中，如图3所示，以上新能源支撑机的预期有功功率指令值△P 10由场站级控制器通过通信设备(以有线方式或无线方式)发送至新能源支撑机的控制装置(如图4中的控制装置1)并由其执行。
新能源支撑机的控制装置根据获取的新能源支撑机的预期有功功率指令值△P 10，控制新能源支撑机按照新能源支撑机的预期有功功率指令值释放其 转动动能或增加其转动动能，也即控制新能源支撑机降低转速或增加转速，以实现向电网中注入能量或从电网中吸收能量。控制新能源支撑机调节其转速的方法及步骤，不再赘述。
在本发明的一些实施例中，考虑到新能源支撑机的容量及转速限制，还包括：新能源支撑机的控制装置根据新能源支撑机的转速上限值和下限值，对接收到的新能源支撑机的预期有功功率指令值进行修正。
在本发明的一些实施例中，对新能源支撑机的预期有功功率指令值进行修正，包括：根据获取的转子转速ω(对应于图4中的N 1)，利用下式修正新能源支撑机的预期有功功率指令值△P 10，得到第一执行有功功率指令值△P 11：
Figure PCTCN2022072980-appb-000009
式(4)中，ω max和ω min分别为新能源支撑机的转速上限值，也即，最大转速，和转速下限值，也即，最小转速。
需要说明的是，在期望从电网向新能源支撑机释放电能时，生成的新能源支撑机的预期有功功率指令值△P 10为负值。但若这时新能源支撑机的转速ω高于转速上限值，受最大转速限制，则需要确定第一执行有功功率指令值为0。这时，下发第一有功功率指令值为零，控制新能源支撑机不与电网发生能量交换。这时，并不执行接收到的新能源支撑机的预期有功功率指令值△P 10而是执行第一执行有功功率指令值△P 11。
需要说明的是，在期望从新能源支撑机向电网释放电能时，生成的新能源支撑机的预期有功功率指令值△P10为正值。但若这时双馈异步电机的转子的转速ω低于转速下限值，受最小转速限制，则需要修正第一执行有功功率指令值为0。这时，下发第一电机执行有功功率指令值为零，控制新能源支撑机不与电网之间发生能量交换。这时，并不执行接收到的新能源支撑机的预期有功功率指令值△P10而是执行第一执行有功功率指令值△P11。针对双馈异步电机的控制方法参见CN111193273B和CN111262254B。
需要说明的是，以上对新能源支撑机的预期有功功率指令值进行修正的步骤，是由子站侧来执行的。其他实施例中，也可以由场站级，也即集中控制器来执行修正。这时，集中控制器可以预先获取新能源支撑机的转速，并根据获取的新能源支撑机的转速，生成新能源支撑机的预期有功功率指令值。也即，将式(3)和式(4)合并在一个式子中实现，不再赘述。
在本发明的一些实施例中，调频装置获取到的系统频率偏移值的绝对值为1.2Hz。1.2Hz大于第一频率控制阈值，且小于第二频率控制阈值1.5Hz(如， 小于系统安全频率阈值)。调频装置在检测到系统频率偏移值的绝对值大于第一频率控制阈值且小于第二频率控制阈值时，确定第二调频方案，第二调频方案包括：控制新能源支撑机投入、控制储能装置投入。
调频装置控制新能源支撑机投入，与上述实施例中相似，不再赘述。
调频装置控制储能装置，包括：生成第二有功调节指令ΔP2，以使得电化学储能装置响应于第一有功调节指令ΔP2，控制电化学储能装置通过调节其荷电状态SOC，来调节其与电网之间交互的电能或有功功率，以最终调节系统频率。
需要说明的是，以使得储能装置执行第二有功调节指令ΔP2，通过控制储能装置充电或放电，来调节系统频率。
在本发明的一些实施例中，生成第二有功调节指令ΔP2，包括：计算储能的预期有功功率指令值△P 20：
Figure PCTCN2022072980-appb-000010
式(5)中，Δf 02为频率响应死区，其值为正数，如，0.02Hz；K 2是储能频率-有功功率系数，其值为负数，如，-1M W/Hz； Δf的绝对值大于Δf 02。
式(5)中，在系统频率偏移值△f为正值时，其与频率响应死区做减后，得到系统频率调节值；在系统频率偏移值△f为负值时，与频率响应死区做加后，得到系统频率调节值。在不考虑频率响应死区因素时，在式(5)中，将△f 02的值取为零即可。
在系统频率偏移值为正值时，△P 20为负值，也即，通过控制储能装置吸收并存储电能，从电网中吸收能量，进而减小系统频率及系统频率偏移值。在系统频率偏移值为负值时，△P 20为正值，也即，通过控制储能装置释放并减少电能，向电网中注入能量，进而增加系统频率及减小系统频率偏移值。
在本发明的一些实施例中，如图3所示，以上储能的预期有功功率指令值△P 20由集中控制器通过通信设备(有线方式或无线方式)发送至电化学储能装置的控制装置(如图4中的控制装置2)并由其执行。
电化学储能装置的控制装置根据获取的第二有功调节指令ΔP2，控制储能装置按照储能的预期有功功率指令值△P 20释放其电能或存储电能，也即电化学储能装置的SOC降低，以实现向电网中注入能量或电化学储能装置的SOC增加，以实现从电网中吸收能量。控制储能装置调节其SOC以调节有功功率及电能的方法及步骤，不再赘述。
在本发明的一些实施例中，考虑到储能装置的容量及SOC上下限值，还包括：电化学储能装置的控制装置根据储能装置SOC上限值和SOC下限值，对接收到的储能的预期有功功率指令值进行修正。
在本发明的一些实施例中，对储能的预期有功功率指令值进行修正，包括：根据获取的储能装置的荷电状态SOC，利用下式修正储能的预期有功功率指令值△P 20，得到第二执行有功功率指令值△P 22：
Figure PCTCN2022072980-appb-000011
式(6)中，SOC max和SOC min分别为电化学储能装置的荷电状态上限值和荷电状态下限值。
需要说明的是，在期望从电网向储能装置释放电能时，生成的储能的预期有功功率指令值△P 20为负值。但若这时储能装置的荷电状态高于其荷电状态上限值时，则为储能装置安全起见，需要确定第二执行有功功率指令值为0。这时，下发的第二有功功率指令值为零，控制电化学储能装置不与电网发生能量交换。这时，并不执行接收到的储能的预期有功功率指令值△P 20而是执行第二执行有功功率指令值△P 22。
在期望从储能装置向电网释放电能时，生成的储能的预期有功功率指令值△P 20为正值。但若这时储能装置的荷电状态低于其荷电状态下限值时，则为储能装置安全起见，需要确定第二执行有功功率指令值为0。这时，下发的第二有功功率指令值为零，控制电化学储能装置不与电网发生能量交换。这时，并不执行接收到的储能的预期有功功率指令值△P 20而是执行第二执行有功功率指令值△P 22。
以上对电化学储能的预期有功功率指令值进行修正的步骤，是由子站侧来执行的。其他实施例中，也可以由场站级，也即集中控制器来执行修正。这时，集中控制器可以预先获取储能装置的荷电状态，并根据获取的储能装置的荷电状态，生成储能的预期有功功率指令值。也即，将式(5)和式(6)合并在一个式子中实现，不再赘述。
在本发明的一些实施例中，在具体实施时，新能源场站附近可能设置有多台新能源支撑机，也可能设置有多组电化学储能装置。这时，可以将多台新能源支撑机等效为一个新能源支撑机，将多组储能装置等效为一个储能装置。之后，仍旧采用前述的调频方法，针对新能源场站执行调频控制，从而提高储能装置的运行安全性。
在本发明的一些实施例中，在调频控制策略的一个执行周期内，集中控制器根据获取的多种物理量数据，分别生成向储能控制子站和/或新能源控制子站下发的有功调节指令，也即调频指令。包括以下步骤：
(1)集中控制器读取交流系统频率f，读取双馈异步电机的转子转速ω(图3中的N 1)和储能装置的荷电状态SOC。
(2)集中控制器读取由上级调度部门的下发的有功控制方式和/或有用功率调节指令P。集中控制器可以为一个或多个。集中控制器可以向一组或多组储能控制子站和或新能源支撑机控制子站的组合分别下发有功控制方式和/或有功功率控制指令值P。
(3)集中控制器根据获取的系统频率f，判断系统频率偏移值的绝对值是否大于第一频率控制阈值f 1。如果大于第一频率偏差阈值f 1，则转入步骤(4)，否则转入步骤(7)。在电网额定频率为50Hz时，系统频率偏移值根据当前的系统频率与电网额定频率做差，可以为正值，也可以为负值。
(4)集中控制器判断系统频率偏移值是否小于第二频率偏差阈值f 2。如果小于第二频率偏差阈值f 2，则转入步骤(5)；否则转入步骤(10)。
这里，第二频率偏差阈值是大于第一频率偏差阈值的正数。因此，只有在系统频率偏移值超过第一频率偏差阈值时，才需要转入步骤(4)来进一步判断是否小于第二频率偏差阈值。如果系统频率偏移值不超过第一频率偏差阈值，就直接转入步骤(7)执行针对第一调频区的步骤。
第二频率偏差阈值可以取系统安全频率阈值，也可以取更小的值。
(5)根据式(3)计算储能的预期有功功率指令值△P 20。
(6)根据获取的储能装置的荷电状态SOC，利用式(4)修正储能的预期有功功率指令值△P 20，得到第二执行有功功率指令值△P 22。
(7)计算式(1)计算新能源支撑机的预期有功功率指令值△P 10。
(8)根据获取的转子的转速ω，利用式(2)修正新能源支撑机的预期有功功率指令值△P 10，得到第一执行有功功率指令值△P 11。
(9)集中控制器向控制装置2和/或控制装置1下发有功调节指令△P 10和△P 20，并回到步骤(1)。
(10)按照预先约定，执行其他的频率调节步骤，并回到步骤(1)。
以上步骤以上，通过设置第一调频区和第二调频区，实现了根据系统频率波动的严重程度对应地采取调频措施。如，在严重程度较低时，处于第一调频区，执行步骤(5)至(9)，投入新能源支撑机进行调频。如，在严重程度较高时，处于第二调频区，执行步骤(7)至(9)，同时投入新能源支撑机和电化学储能装置进行调频。
在本发明的一些实施例中，如图9所示，本发明实施例的基于新能源支撑机与储能装置的调频装置900，包括：
获取部分910，被配置为获取系统频率偏移值；
处理部分920，被配置为根据系统频率偏移值，确定针对新能源支撑机和/或储能装置的调频方案；
根据调频方案，生成针对新能源支撑机和/或储能装置的调频指令，以使得新能源支撑机和/或储能装置执行相应的调频指令，调节系统频率。
在本发明的一些实施例中，所述处理部分920，还被配置为在检测到所述系统频率偏移值的绝对值不大于第一频率控制阈值时，确定第一调频方案，所述第一调频方案包括：控制所述新能源支撑机投入。
在本发明的一些实施例中，所述处理部分920，还被配置为根据所述第一调频方案，在第一调频区内，生成针对所述新能源支撑机的第一有功调节指令，以使得所述新能源支撑机执行所述第一有功调节指令，通过控制所述新能源支撑机提高转速或降低转速，来调节系统频率。
在本发明的一些实施例中，所述处理部分920，还被配置为在检测到所述系统频率偏移值的绝对值大于第一频率控制阈值且小于第二频率控制阈值时，确定第二调频方案，所述第二调频方案包括：控制所述新能源支撑机投入、及控制所述储能装置投入；其中，所述第一频率控制阈值为正数；所述第二频率控制阈值为大于所述第一频率控制阈值的正数。
在本发明的一些实施例中，所述处理部分920，还被配置为根据所述第二调频方案，在第二调频区内，生成针对所述新能源支撑机的第一有功调节指令，以使得所述新能源支撑机执行所述第一有功调节指令，通过控制所述新能源支撑机提高转速或降低转速，来调节系统频率；根据所述第二调频方案，在第二调频区内，生成针对所述储能装置的第二有功调节指令，以使得所述储能装置执行所述第一有功调节指令，通过控制所述储能装置充电或放电，来调节系统频率。
在本发明的一些实施例中，所述处理部分920，还被配置为根据所述新能源支撑机的转速，修正与所述第一有功调节指令对应的新能源支撑机的预期有功功率指令值。
在本发明的一些实施例中，所述处理部分920，还被配置为根据所述储能装置的荷电状态，修正与所述第二有功调节指令对应的储能的预期有功功率指令值。
本发明一个实施例的基于新能源支撑机与储能装置的电网调频系统，包括：
获取部分，被配置为获取系统频率偏移值；
处理部分，被配置为根据系统频率偏移值，确定针对新能源支撑机和/或储能装置的调频方案；
根据调频方案，生成针对新能源支撑机和/或储能装置的调频指令，以使得新能源支撑机和/或储能装置执行相应的调频指令，调节系统频率；
新能源支撑机控制部分，被配置为从处理部分获取相应的调频指令，并控制新能源支撑机执行相应的调频指令；
储能装置控制部分，被配置为从处理部分获取相应的调频指令，并控制储能装置执行相应的调频指令。
本发明一个实施例的新能源场站，包括：
新能源发电设备，其在新能源并网点并入电网；
新能源支撑机，新能源支撑机连接在新能源并网点；
电化学储能装置，储能装置连接在新能源并网点；
如前述说明的电网调频系统。
以上针对有功功率调节的方法进行了说明。电网出现不平衡或故障时，还包括针对无功功率的调节，不再赘述。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上， 使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
以上已经通过参考少量实施方式描述了本发明。然而，本领域技术人员所公知的，正如附带的专利权利要求所限定的，除了本发明以上公开的其他的实施例等同地落在本发明的范围内。
通常地，在权利要求中使用的所有术语都根据他们在技术领域的通常含义被解释，除非在其中被另外明确地定义。所有的参考“一个//该[装置、组件等]”都被开放地解释为装置、组件等中的至少一个实例，除非另外明确地说明。这里公开的任何方法的步骤都没必要以公开的准确的顺序运行，除非明确地说明。
工业实用性
本发明实施例公开了基于新能源支撑机与储能装置的调频方法、装置、系统及新能源场站。该方法包括：获取系统频率偏移值；根据所述系统频率偏移值，确定针对所述新能源支撑机和/或所述储能装置的调频方案；根据所述调频方案，生成针对所述新能源支撑机和/或所述储能装置的调频指令，以使得所述新能源支撑机和/或所述储能装置执行相应的调频指令，调节系统频率。该方法规则性强，规则调整灵活，实时性好。在电网发生系统频率波动时，选择投入耐久性更好的新能源支撑机来对电网提供支撑。仅在系统频率波动过大时，才选择投入耐久性较差的电化学储能装置来共同对电网提供支撑，从而减少储能装置的投入次数，实现了储能装置安全运行并提高了其使用安全性。

Claims (16)

  1. 一种基于新能源支撑机与储能装置的调频方法，
    所述新能源支撑机连接在新能源并网点；
    所述储能装置连接在新能源并网点；
    所述方法包括：
    获取系统频率偏移值；
    根据所述系统频率偏移值，确定针对所述新能源支撑机和/或所述储能装置的调频方案；
    根据所述调频方案，生成针对所述新能源支撑机和/或所述储能装置的调频指令，以使得所述新能源支撑机和/或所述储能装置执行相应的调频指令，调节系统频率。
  2. 根据权利要求1所述的调频方法，其中，所述根据所述系统频率偏移值，确定针对所述新能源支撑机和/或所述储能装置的调频方案，包括：
    在检测到所述系统频率偏移值的绝对值不大于第一频率控制阈值时，确定第一调频方案，所述第一调频方案包括：控制所述新能源支撑机投入。
  3. 根据权利要求2所述的调频方法，其中，还包括：
    根据所述第一调频方案，在第一调频区内，生成针对所述新能源支撑机的第一有功调节指令，以使得所述新能源支撑机执行所述第一有功调节指令，通过控制所述新能源支撑机提高转速或降低转速，来调节系统频率。
  4. 根据权利要求2所述的调频方法，其中，所述根据所述系统频率偏移值，确定针对所述新能源支撑机和/或所述储能装置的调频方案，包括：
    在检测到所述系统频率偏移值的绝对值大于第一频率控制阈值且小于第二频率控制阈值时，确定第二调频方案，所述第二调频方案包括：控制所述新能源支撑机投入、及控制所述储能装置投入；
    其中，所述第一频率控制阈值为正数；所述第二频率控制阈值为大于所述第一频率控制阈值的正数。
  5. 根据权利要求4所述的调频方法，其中，还包括：
    根据所述第二调频方案，在第二调频区内，生成针对所述新能源支撑机的第一有功调节指令，以使得所述新能源支撑机执行所述第一有功调节指令，通过控制所述新能源支撑机提高转速或降低转速，来调节系统频率；
    根据所述第二调频方案，在第二调频区内，生成针对所述储能装置的第二有功调节指令，以使得所述储能装置执行所述第一有功调节指令，通过控制所述储能装置充电或放电，来调节系统频率。
  6. 根据权利要求3所述的调频方法，其中，所述根据所述第一调频方案，在第一调频区内，生成针对所述新能源支撑机的第一有功调节指令之后，所述方法还包括：
    根据所述新能源支撑机的转速，修正与所述第一有功调节指令对应的新能源支撑机的预期有功功率指令值。
  7. 根据权利要求5所述的调频方法，其中，根据所述第二调频方案，在第二调频区内，生成针对所述储能装置的第二有功调节指令之后，所述方法还包括：
    根据所述储能装置的荷电状态，修正与所述第二有功调节指令对应的储能的预期有功功率指令值。
  8. 一种基于新能源支撑机与储能装置的调频装置，
    所述新能源支撑机连接在新能源并网点；
    所述储能装置连接在新能源并网点；
    所述装置包括：
    获取部分，被配置为获取系统频率偏移值；
    处理部分，被配置为根据所述系统频率偏移值，确定针对所述新能源支撑机和/或所述储能装置的调频方案；
    根据所述调频方案，生成针对所述新能源支撑机和/或所述储能装置的调频指令，以使得所述新能源支撑机和/或所述储能装置执行相应的调频指令，调节系统频率。
  9. 根据权利要求8所述的调频装置，其中，所述处理部分，还被配置为在检测到所述系统频率偏移值的绝对值不大于第一频率控制阈值时，确定第一调频方案，所述第一调频方案包括：控制所述新能源支撑机投入。
  10. 根据权利要求9所述的调频装置，其中，所述处理部分，还被配置为根据所述第一调频方案，在第一调频区内，生成针对所述新能源支撑机的第一有功调节指令，以使得所述新能源支撑机执行所述第一有功调节指令，通过控制所述新能源支撑机提高转速或降低转速，来调节系统频率。
  11. 根据权利要求9所述的调频装置，其中，所述处理部分，还被配置为在检测到所述系统频率偏移值的绝对值大于第一频率控制阈值且小于第二频率控制阈值时，确定第二调频方案，所述第二调频方案包括：控制所述新能源支撑机投入、及控制所述储能装置投入；
    其中，所述第一频率控制阈值为正数；所述第二频率控制阈值为大于所述第一频率控制阈值的正数。
  12. 根据权利要求11所述的调频装置，其中，所述处理部分，还被配 置为根据所述第二调频方案，在第二调频区内，生成针对所述新能源支撑机的第一有功调节指令，以使得所述新能源支撑机执行所述第一有功调节指令，通过控制所述新能源支撑机提高转速或降低转速，来调节系统频率；
    根据所述第二调频方案，在第二调频区内，生成针对所述储能装置的第二有功调节指令，以使得所述储能装置执行所述第一有功调节指令，通过控制所述储能装置充电或放电，来调节系统频率。
  13. 根据权利要求10所述的调频装置，其中，所述处理部分，还被配置为根据所述新能源支撑机的转速，修正与所述第一有功调节指令对应的新能源支撑机的预期有功功率指令值。
  14. 根据权利要求12所述的调频装置，其中，所述处理部分，还被配置为根据所述储能装置的荷电状态，修正与所述第二有功调节指令对应的储能的预期有功功率指令值。
  15. 一种基于新能源支撑机与储能装置的电网调频系统，包括：
    如权利要求8至14中任一项所述的基于新能源支撑机与储能装置的调频装置；
    新能源支撑机控制部分，被配置为从所述处理部分获取相应的调频指令，并控制所述新能源支撑机执行相应的调频指令；
    储能装置控制部分，被配置为从所述处理部分获取相应的调频指令，并控制所述储能装置执行相应的调频指令。
  16. 一种新能源场站，包括：
    新能源发电设备，其在新能源并网点并入电网；
    新能源支撑机，所述新能源支撑机连接在所述新能源并网点；
    储能装置，所述储能装置连接在所述新能源并网点；
    如权利要求15所述的电网调频系统。
PCT/CN2022/072980 2021-11-19 2022-01-20 基于新能源支撑机与储能装置的调频方法、装置、系统及新能源场站 WO2023087535A1 (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2022391351A AU2022391351A1 (en) 2021-11-19 2022-01-20 Frequency modulation method, device and system based on new energy support machine and energy storage device, and new energy station
EP22894083.9A EP4395096A1 (en) 2021-11-19 2022-01-20 Frequency modulation method, device and system based on new energy support machine and energy storage device, and new energy station

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202111372645.4 2021-11-19
CN202111372645.4A CN113809761A (zh) 2021-11-19 2021-11-19 基于新能源支撑机与储能装置的调频方法及新能源场站

Publications (1)

Publication Number Publication Date
WO2023087535A1 true WO2023087535A1 (zh) 2023-05-25

Family

ID=78938461

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2022/072980 WO2023087535A1 (zh) 2021-11-19 2022-01-20 基于新能源支撑机与储能装置的调频方法、装置、系统及新能源场站

Country Status (4)

Country Link
EP (1) EP4395096A1 (zh)
CN (1) CN113809761A (zh)
AU (1) AU2022391351A1 (zh)
WO (1) WO2023087535A1 (zh)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116388234A (zh) * 2023-06-07 2023-07-04 坎德拉(深圳)新能源科技有限公司 并网发电系统的控制方法、系统、控制器及存储介质
CN117117905A (zh) * 2023-10-23 2023-11-24 国网江西省电力有限公司电力科学研究院 一种基于光储协调的一次调频控制方法及系统
CN117375027A (zh) * 2023-12-08 2024-01-09 华控泰思(北京)储能技术有限公司 一种风储联合调频频率控制方法
CN117996787A (zh) * 2024-04-03 2024-05-07 西安热工研究院有限公司 一种基于双向预测的熔盐耦合火电机组的调频方法
CN117996786A (zh) * 2024-04-03 2024-05-07 西安热工研究院有限公司 一种基于二次修正的熔盐耦合火电机组的调频方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113809761A (zh) * 2021-11-19 2021-12-17 中国电力科学研究院有限公司 基于新能源支撑机与储能装置的调频方法及新能源场站
CN114301103B (zh) * 2022-03-09 2022-06-14 山东大学 风储协调的直驱风电机组控制方法及系统

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103441534A (zh) * 2013-07-23 2013-12-11 清华大学 Agc系统中传统机组与储能系统配合的控制策略
CN107069789A (zh) * 2017-05-13 2017-08-18 东北电力大学 一种面向电网agc调频的储能系统控制策略
CN110492532A (zh) * 2019-08-14 2019-11-22 华润电力唐山丰润有限公司 供电系统的调频方法、装置和设备
CN111193273A (zh) 2020-04-14 2020-05-22 中国电力科学研究院有限公司 调相机控制方法、装置、调相机系统及存储介质
CN111262254A (zh) 2020-04-14 2020-06-09 中国电力科学研究院有限公司 调相机控制方法、装置、调相机系统及存储介质
CN112350348A (zh) * 2021-01-07 2021-02-09 中国电力科学研究院有限公司 增加新能源场站调节能力的储能控制方法及新能源支撑机
WO2021068320A1 (zh) * 2019-10-12 2021-04-15 上海豫源电力科技有限公司 一种用于储能调频系统的信号测量方法
CN113809761A (zh) * 2021-11-19 2021-12-17 中国电力科学研究院有限公司 基于新能源支撑机与储能装置的调频方法及新能源场站

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103746408B (zh) * 2014-01-28 2018-06-15 北京科东电力控制系统有限责任公司 大规模风电agc协调控制方法
CN109802413B (zh) * 2017-11-17 2022-10-04 中国电力科学研究院有限公司 一种主动支撑电网频率响应控制方法及系统
GB2582743B (en) * 2019-03-26 2021-06-02 Centrica Business Solutions Belgium N V System for responding to frequency fluctuations in an energy grid
CN112332462B (zh) * 2020-08-18 2023-01-24 华北电力大学（保定） 考虑源-荷功率随机波动特性的双馈风力发电机组一次频率平滑调节方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103441534A (zh) * 2013-07-23 2013-12-11 清华大学 Agc系统中传统机组与储能系统配合的控制策略
CN107069789A (zh) * 2017-05-13 2017-08-18 东北电力大学 一种面向电网agc调频的储能系统控制策略
CN110492532A (zh) * 2019-08-14 2019-11-22 华润电力唐山丰润有限公司 供电系统的调频方法、装置和设备
WO2021068320A1 (zh) * 2019-10-12 2021-04-15 上海豫源电力科技有限公司 一种用于储能调频系统的信号测量方法
CN111193273A (zh) 2020-04-14 2020-05-22 中国电力科学研究院有限公司 调相机控制方法、装置、调相机系统及存储介质
CN111262254A (zh) 2020-04-14 2020-06-09 中国电力科学研究院有限公司 调相机控制方法、装置、调相机系统及存储介质
CN112350348A (zh) * 2021-01-07 2021-02-09 中国电力科学研究院有限公司 增加新能源场站调节能力的储能控制方法及新能源支撑机
CN113809761A (zh) * 2021-11-19 2021-12-17 中国电力科学研究院有限公司 基于新能源支撑机与储能装置的调频方法及新能源场站

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116388234A (zh) * 2023-06-07 2023-07-04 坎德拉(深圳)新能源科技有限公司 并网发电系统的控制方法、系统、控制器及存储介质
CN116388234B (zh) * 2023-06-07 2023-09-01 坎德拉(深圳)新能源科技有限公司 并网发电系统的控制方法、系统、控制器及存储介质
CN117117905A (zh) * 2023-10-23 2023-11-24 国网江西省电力有限公司电力科学研究院 一种基于光储协调的一次调频控制方法及系统
CN117117905B (zh) * 2023-10-23 2024-03-12 国网江西省电力有限公司电力科学研究院 一种基于光储协调的一次调频控制方法及系统
CN117375027A (zh) * 2023-12-08 2024-01-09 华控泰思(北京)储能技术有限公司 一种风储联合调频频率控制方法
CN117375027B (zh) * 2023-12-08 2024-02-27 华控泰思(北京)储能技术有限公司 一种风储联合调频频率控制方法
CN117996787A (zh) * 2024-04-03 2024-05-07 西安热工研究院有限公司 一种基于双向预测的熔盐耦合火电机组的调频方法
CN117996786A (zh) * 2024-04-03 2024-05-07 西安热工研究院有限公司 一种基于二次修正的熔盐耦合火电机组的调频方法
CN117996787B (zh) * 2024-04-03 2024-06-11 西安热工研究院有限公司 一种基于双向预测的熔盐耦合火电机组的调频方法

Also Published As

Publication number Publication date
AU2022391351A1 (en) 2024-05-02
CN113809761A (zh) 2021-12-17
EP4395096A1 (en) 2024-07-03

Similar Documents

Publication Publication Date Title
WO2023087535A1 (zh) 基于新能源支撑机与储能装置的调频方法、装置、系统及新能源场站
CN113013893B (zh) 一种新能源场站自适应频率控制方法和系统
Qiao et al. Grid connection requirements and solutions for DFIG wind turbines
CN105162167B (zh) 一种基于自适应下垂控制的风光储微网调频方法
CN110535153B (zh) 混合储能系统dc/ac变换器协调控制方法及装置
CN102354992A (zh) 风电场无功功率控制方法
CN110071531A (zh) 一种大规模储能与永磁风力发电协调控制系统及方法
WO2024113639A1 (zh) 一种100％新能源送端电网的后备电压频率支撑方法
Binbing et al. RoCoF droop control of PMSG-based wind turbines for system inertia response rapidly
CN105449725A (zh) 直驱风力发电机组频率穿越方法和装置
CN111900710A (zh) 一种并网型直流微电网协调控制方法
CN113193587B (zh) 孤岛双馈风电场经高压直流输电外送协同控制方法及系统
CN107124008B (zh) 一种风电场内风电机组与svg设备的无功协同控制方法
CN116937546A (zh) 一种考虑风储并网的电网低频振荡抑制方法及系统
CN113852099B (zh) 一种直驱风电机组快速频率响应控制系统及方法
CN103414214A (zh) 异步风电机组的低电压穿越和无功控制系统及方法
Hu et al. A distributed energy storage system integrated in pmsg system for mitigating wind farm fluctuations and providing inertial response
CN113852128A (zh) 一种风电直流送出系统的直驱风电场故障穿越控制方法
CN114465244A (zh) 一种考虑调压裕度的大型风电场无功电压控制方法及装置
Xu et al. A New Adaptive Frequency Control Strategy for VSG Based on Grid Forming Converter of Renewable Energy
Yu et al. Dynamic Power Control of PMSG-WTG for Low Voltage Recovery in Distribution Network
Wang et al. Research on Reactive Power Control of the Grid-Side Converter of DFIG Based Wind Farm
Wen et al. Retrospect and prospect of wind power participating in power system frequency regulation
CN110086203A (zh) 基于直流换相失败识别的送端电网双馈风机低穿控制方法
Botian et al. Research on the Influence of Wind Turbines' Participation in Frequency Modulation on Grid Frequency Characteristics

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22894083

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2022894083

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2022894083

Country of ref document: EP

Effective date: 20240328

WWE Wipo information: entry into national phase

Ref document number: AU2022391351

Country of ref document: AU

WWE Wipo information: entry into national phase

Ref document number: 18704119

Country of ref document: US

ENP Entry into the national phase

Ref document number: 2022391351

Country of ref document: AU

Date of ref document: 20220120

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE