WO2022198764A1 - Système et procédé de commande pour système connecté à un réseau d'énergie éolienne en mer - Google Patents

Système et procédé de commande pour système connecté à un réseau d'énergie éolienne en mer Download PDF

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Publication number
WO2022198764A1
WO2022198764A1 PCT/CN2021/092929 CN2021092929W WO2022198764A1 WO 2022198764 A1 WO2022198764 A1 WO 2022198764A1 CN 2021092929 W CN2021092929 W CN 2021092929W WO 2022198764 A1 WO2022198764 A1 WO 2022198764A1
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Prior art keywords
wind farm
grid
side converter
frequency
converter
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PCT/CN2021/092929
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English (en)
Chinese (zh)
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迟永宁
李琰
刘宏志
樊肖杰
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中国电力科学研究院有限公司
国家电网有限公司
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Publication of WO2022198764A1 publication Critical patent/WO2022198764A1/fr

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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
    • H02J3/24—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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • 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
    • H02J3/381—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
    • 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

Definitions

  • the present application relates to the technical field of offshore wind power generation, for example, to a control method and system for an offshore wind power grid-connected system.
  • VSC-HVDC Voltage Source Converter-High Voltage Direct Current
  • the frequency deviation information of the AC power grid at the receiving end is often transmitted to the offshore wind farm by means of remote communication, and the inertial support is realized by using the rotational kinetic energy of the wind turbine in the offshore wind farm.
  • This method relies on long-distance communication, which not only increases equipment investment, but also has problems such as delay and poor reliability.
  • the offshore wind power grid-connected system has the function of inertia support and primary frequency modulation similar to the traditional synchronous motor.
  • the present application provides a control method and system for an offshore wind power grid-connected system.
  • a control method for an offshore wind power grid-connected system wherein the offshore wind power grid-connected system adopts a flexible direct current transmission technology for grid connection, and the method includes:
  • the DC-side voltage of the grid-side converter is controlled to be the reference value of the DC-side voltage of the grid-side converter
  • the AC side frequency reference value of the wind farm side converter is determined; wherein, the DC side voltage of the wind farm side converter is equal to the DC side voltage of the grid-side converter;
  • the AC side frequency of the wind farm side converter is controlled to be the AC side frequency reference value of the wind farm side converter
  • the active power output of the wind farm in the offshore wind power grid-connected system is controlled by using the controlled AC side frequency of the wind farm side converter.
  • control system for an offshore wind power grid-connected system wherein the offshore wind power grid-connected system adopts flexible direct current transmission technology for grid connection, and the system includes:
  • a first determining module configured to determine the DC side of the grid-side converter of the VSC-HVDC system in the offshore wind power grid-connected system based on the frequency of the receiving-end AC power grid in the event of a failure of the receiving-end AC power grid voltage reference;
  • a first control module configured to adopt the double closed-loop control technology of the grid-side converter, to control the DC-side voltage of the grid-side converter to be a reference value of the DC-side voltage of the grid-side converter;
  • the second determination module is configured to determine the AC side frequency reference value of the wind farm side converter based on the DC side voltage of the wind farm side converter of the VSC-HVDC system; wherein, the wind farm side converter The DC side voltage of the converter is equal to the DC side voltage of the grid side converter;
  • the second control module is configured to adopt the double closed-loop control technology of the wind farm side converter, and control the AC side frequency of the wind farm side converter as the reference frequency of the AC side of the wind farm side converter value;
  • the third control module is configured to use the controlled AC side frequency of the wind farm side converter to control the active power output of the wind farm in the offshore wind power grid-connected system.
  • FIG. 1 is a flowchart of a control method for enhancing the inertia response capability of an offshore wind power grid-connected system provided by an embodiment of the present application;
  • FIG. 2 is a structural diagram of a control system for enhancing the inertia response capability of an offshore wind power grid-connected system provided by an embodiment of the present application;
  • FIG. 3 is a block diagram of a control strategy of an offshore wind power grid-connected system provided by an embodiment of the present application
  • FIG. 4 is a schematic diagram of a double closed-loop control of a grid-side converter of a VSC-HVDC in an offshore wind power grid-connected system provided by an embodiment of the present application;
  • FIG. 5 is a schematic diagram of a double closed-loop control of a wind farm side converter of a VSC-HVDC in an offshore wind power grid-connected system provided by an embodiment of the present application.
  • the present application provides a control method for enhancing the inertia response capability of an offshore wind power grid-connected system, where the offshore wind power grid-connected system adopts flexible DC power transmission technology for grid connection, as shown in FIG. 1 , including:
  • Step 101 when the receiving end AC power grid fails, determine the DC side voltage reference value of the grid-side converter of the VSC-HVDC system in the offshore wind power grid-connected system based on the receiving end AC power grid frequency.
  • Step 102 using the double closed-loop control technology of the grid-side converter, to control the DC-side voltage of the grid-side converter to be the reference value of the DC-side voltage of the grid-side converter.
  • Step 103 based on the DC side voltage of the wind farm side converter of the VSC-HVDC system in the offshore wind power grid-connected system, determine the AC side frequency reference value of the wind farm side converter.
  • Step 104 using the double closed-loop control technology of the wind farm side converter to control the AC side frequency of the wind farm side converter to be the AC side frequency reference value of the wind farm side converter.
  • Step 105 using the AC side frequency of the wind farm side converter to control the active power output of the wind farm in the offshore wind power grid-connected system.
  • the DC side voltage of the wind farm side converter of the VSC-HVDC system in the offshore wind power grid connected system is equal to the DC side voltage of the grid side converter of the VSC-HVDC system in the offshore wind power grid connected system.
  • step 101 the calculation formula of the DC-side voltage reference value of the grid-side converter of the VSC-HVDC system in the offshore wind power grid-connected system is as follows:
  • T GSVSC is the inertia time constant of the grid-side converter of the VSC-HVDC system in the offshore wind power grid-connected system
  • S GSVSC is the rated capacity of the grid-side converter of the VSC-HVDC system in the offshore wind power grid-connected system
  • C GSVSC is the DC-side equivalent capacitance of the grid-side converter of the VSC-HVDC system in the offshore wind power grid-connected system
  • f N is The rated frequency of the receiving side AC grid
  • f is the receiving side AC grid frequency
  • dcN is the DC side voltage rating of the grid-side converter of the VSC-HVDC system in the offshore wind power grid-connected system.
  • step 102 the calculation formula of the AC side frequency reference value of the wind farm side converter is as follows:
  • f WF0 is the AC side initial frequency of the wind farm side converter of the VSC-HVDC system in the offshore wind power grid-connected system
  • C WFVSC is the DC side equivalent capacitance of the wind farm side converter of the VSC-HVDC system in the offshore wind power grid-connected system
  • T WFVSC is the inertia of the wind farm side converter of the VSC-HVDC system in the offshore wind power grid-connected system Time constant
  • S WFVSC is the rated capacity of the wind farm side converter of the VSC-HVDC system in the offshore wind power grid-connected system
  • f N is the rated frequency of the AC power grid at the receiving end
  • U WFVSC, dcN is the VSC in the offshore wind power grid-connected system -
  • U dc is the DC side voltage of the wind farm side converter of the VSC-HVDC system in the offshore wind power grid-connected system.
  • the step 103 includes:
  • Step 103-1 based on the AC side frequency of the wind farm side converter, determine the active power adjustment amount with frequency change information corresponding to the wind farm in the offshore wind power grid-connected system.
  • Step 103-2 control the active power output of the wind farm in the offshore wind power grid-connected system to be the active power adjustment amount with frequency change information corresponding to the wind farm and the original maximum power point tracking (Maximum Power Point Tracking, MPPT) of the wind farm Summation of active reference values under control.
  • MPPT Maximum Power Point Tracking
  • step 103-1 the calculation formula of the active power adjustment amount with frequency change information corresponding to the wind farm in the offshore wind power grid-connected system is as follows:
  • Pad is the active power adjustment with frequency change information corresponding to the wind farm in the offshore wind power grid-connected system
  • K I is the proportional coefficient in the PID controller
  • ⁇ f WF is the VSC-HVDC system in the offshore wind power grid-connected system is the AC side frequency deviation of the wind farm side converter
  • K D is the integral coefficient in the PID controller
  • f WF is the AC side frequency of the wind farm side converter of the VSC-HVDC system in the offshore wind power grid-connected system
  • f WF0 is the initial frequency of the AC side of the wind farm side converter of the VSC-HVDC system in the offshore wind power grid-connected system.
  • the grid-side converter adopts inertia control to couple the frequency change information of the AC power grid at the receiving end with the DC voltage, and at the same time the capacitor absorbs/releases its own energy to stabilize
  • the inverter on the wind farm side adopts frequency control, and the DC voltage change information is proportionally reflected as the frequency change on the wind farm side.
  • Active power output in response to system frequency changes, improves the inertia support ability of the offshore wind power grid-connected system to the AC power grid at the receiving end.
  • the present application provides a control system for enhancing the inertia response capability of an offshore wind power grid-connected system.
  • the offshore wind power grid-connected system adopts flexible DC power transmission technology for grid connection. As shown in FIG. 2 , the system includes:
  • the first determining module is configured to determine the DC side voltage reference value of the grid-side converter of the VSC-HVDC system in the offshore wind power grid-connected system based on the frequency of the receiving side AC grid when the receiving end AC power grid fails; the first control The module is set to adopt the double closed-loop control technology of the grid-side converter to control the DC-side voltage of the grid-side converter to be the reference value of the DC-side voltage of the grid-side converter; the second determination module is set to Based on the DC side voltage of the wind farm side converter of the VSC-HVDC system in the offshore wind power grid-connected system, the AC side frequency reference value of the wind farm side converter is determined; the second control module is set to adopt the wind farm side frequency reference value.
  • the double closed-loop control technology of the converter controls the AC side frequency of the wind farm side converter to be the AC side frequency reference value of the wind farm side converter; the third control module is set to use the wind farm side inverter.
  • the AC side frequency of the side converter controls the active power output of the wind farm in the offshore wind power grid-connected system; among them, the DC side voltage of the wind farm side converter of the VSC-HVDC system in the offshore wind power grid-connected system is equal to the offshore wind power grid-connected.
  • the DC side voltage of the grid-side converter of the VSC-HVDC system in the system is equal to the offshore wind power grid-connected.
  • T GSVSC is the inertia time constant of the grid-side converter of the VSC-HVDC system in the offshore wind power grid-connected system
  • S GSVSC is the rated capacity of the grid-side converter of the VSC-HVDC system in the offshore wind power grid-connected system
  • C GSVSC is the DC-side equivalent capacitance of the grid-side converter of the VSC-HVDC system in the offshore wind power grid-connected system
  • f N is The rated frequency of the receiving side AC grid
  • f is the receiving side AC grid frequency
  • dcN is the DC side voltage rating of the grid-side converter of the VSC-HVDC system in the offshore wind power grid-connected system.
  • f WF0 is the AC side initial frequency of the wind farm side converter of the VSC-HVDC system in the offshore wind power grid-connected system
  • C WFVSC is the DC side equivalent capacitance of the wind farm side converter of the VSC-HVDC system in the offshore wind power grid-connected system
  • T WFVSC is the inertia of the wind farm side converter of the VSC-HVDC system in the offshore wind power grid-connected system Time constant
  • S WFVSC is the rated capacity of the wind farm side converter of the VSC-HVDC system in the offshore wind power grid-connected system
  • f N is the rated frequency of the AC power grid at the receiving end
  • U WFVSC, dcN is the VSC in the offshore wind power grid-connected system -
  • U dc is the DC side voltage of the wind farm side converter of the VSC-HVDC system in the offshore wind power grid-connected system.
  • the third control module includes:
  • the first determining unit is configured to determine, based on the AC side frequency of the wind farm side converter, the active power adjustment amount with frequency change information corresponding to the wind farm in the offshore wind power grid-connected system; the control unit is configured to control the offshore wind power
  • the active power output of the wind farm in the grid-connected system is the sum of the active power adjustment value with frequency change information corresponding to the wind farm and the active power reference value of the wind farm under the original MPPT control.
  • Pad is the active power adjustment with frequency change information corresponding to the wind farm in the offshore wind power grid-connected system
  • K I is the proportional coefficient in the PID controller
  • ⁇ f WF is the VSC-HVDC system in the offshore wind power grid-connected system is the AC side frequency deviation of the wind farm side converter
  • K D is the integral coefficient in the PID controller
  • f WF is the AC side frequency of the wind farm side converter of the VSC-HVDC system in the offshore wind power grid-connected system
  • f WF0 is the initial frequency of the AC side of the wind farm side converter of the VSC-HVDC system in the offshore wind power grid-connected system.
  • VSC-HVDC wind farm side voltage source converter (Wind Farm Side Voltage Source Converter, WFVSC) (referred to as wind farm side converter) DC side voltage and the offshore wind power grid-connected system
  • the DC side voltage of the grid side voltage source converter (Grid Side Voltage Source Converter, GSVSC) (referred to as the grid side converter) of the VSC-HVDC in the middle is equal, and the DC side voltage rating of WFVSC and the DC side voltage rating of GSVSC are rated If the values are equal, the same specifications are used for WFVSC and GSVSC, that is, the inertia time constants corresponding to WFVSC and GSVSC are the same, the rated capacity for WFVSC and GSVSC is the same, and the equivalent capacitance for the DC side is the same for WFVSC and GSVSC.
  • the present application proposes a control method for enhancing the inertia response capability of the offshore wind power grid-connected system, This method focuses on coordinating and controlling the power of grid-side converters, wind farm-side converters and wind turbines to enhance the inertia response capability of the offshore wind power grid-connected system.
  • the characteristics of the voltage, the frequency change information of the AC power grid at the receiving end is converted into the change of the DC voltage through the GSVSC.
  • the wind farm side converter adopts frequency conversion control, which transmits the frequency change information on the AC grid side of the receiving end to the offshore wind farm side, and realizes the phase-locked loop tracking of the grid frequency.
  • the kinetic energy release of the wind turbine is controlled to realize the inertia support for the AC power grid at the receiving end.
  • the inertia of the offshore wind farm and the VSC-HVDC are mobilized at the same time, and the inertia support capability of the AC power grid at the receiving end is enhanced.
  • the whole control method includes the coordinated control of the grid-side converter (GSVSC), the wind farm-side converter (WFVSC) and the wind turbine, the energy of the DC capacitor and the rotor kinetic energy of the doubly-fed wind turbine partially compensate for the inconsistency of the grid frequency fluctuation. Therefore, the provided control method mainly includes three parts: (1) grid side converter (GSVSC) DC capacitive inertial support control; (2) wind farm side converter ( WFVSC) frequency conversion control; (3) wind turbine power control.
  • GSVSC grid side converter
  • WFVSC wind farm side converter
  • GSVSC Grid-side converter
  • J is the moment of inertia of the synchronous generator
  • ⁇ m is the electrical angular velocity of the synchronous generator.
  • the traditional synchronous generator converts the rotor kinetic energy into active power output by adjusting the rotor speed, which plays the role of adjusting the active power balance and smoothing the frequency fluctuation.
  • the speed adjustment range of the synchronous generator determines its dynamic response capability to grid frequency changes.
  • T J of the synchronous generator can be expressed as:
  • ⁇ N is the rated mechanical angular speed of the synchronous generator
  • S N is the rated power of the synchronous generator
  • P m is the mechanical power of the synchronous generator
  • Pe is the electromagnetic power of the synchronous generator
  • ⁇ is the mechanical angular velocity of the synchronous generator.
  • the mechanical angular velocity ⁇ of the synchronous generator is related to the electrical angular velocity ⁇ m
  • the rated mechanical angular velocity ⁇ N of the synchronous motor is related to the rated electrical angular velocity ⁇ mN as follows:
  • Formula (3) can be expressed as:
  • f is the grid frequency, f N grid frequency rating.
  • the DC capacitance of the converter is a key factor affecting the stability of the DC side voltage.
  • the time constant ⁇ C of the DC capacitance of the converter is:
  • C is the equivalent capacitance of the DC side of the converter
  • U dc is the DC side voltage of the converter
  • S VSC is the rated capacity of the converter.
  • the converters described here include grid-side converters (GSVSC) and wind farm-side converters (WFVSC). side voltage fluctuations.
  • GSVSC grid-side converters
  • WFVSC wind farm-side converters
  • P WF is the active power output by WFVSC
  • P GS is the active power connected to the grid by GSVSC.
  • Equation (2) From the analogy between equation (2) and equation (6), it can be seen that the inertia time constant of the synchronous generator and the equivalent time constant of the DC side capacitance of the converter have similar properties. Among them, the DC voltage U dc and the mechanical angular velocity of the synchronous motor rotor ⁇ N corresponds. Comparing Equation (5) with Equation (7), it can be seen that the inertia response characteristics of the synchronous generator are similar to the dynamic characteristics of the DC voltage, both of which play a buffering role in the impact of unbalanced power.
  • the change of the DC voltage can be analogized to the change of the speed of the synchronous generator, and the energy storage of the DC voltage can be equivalent to the mechanical energy of the synchronous generator, that is, the power released by the change of the DC voltage can be equivalent to the change of the kinetic energy of the rotor of the synchronous generator. Therefore, the charging and discharging power can be quantified by changing the voltage of the DC capacitor, so that the DC side can provide a virtual VSC inertia.
  • T VSC is the inertia time constant of the converter.
  • U dcN is the DC voltage rating.
  • Equation 11 is the DC voltage controlled by the grid-side converter (GSVSC) DC capacitive inertial support.
  • GSVSC grid-side converter
  • U dc represents the current DC voltage
  • the system frequency deviation should not exceed 1% of the rated value, that is, it should be within ⁇ 0.5Hz, and the DC voltage fluctuation should not exceed 5% of the rated voltage.
  • the DC voltage only fluctuates in a small range, so the first-order Taylor expansion of Equation (11) at U dcN can be used to obtain:
  • Equation (12) constructs the relationship between power grid frequency fluctuation and DC voltage change, which can be obtained:
  • the grid side frequency information is converted into DC voltage changes, and at the same time, the electromagnetic energy in the DC side is used to simulate it as the mechanical kinetic energy of the synchronous machine rotor, which realizes the inertia support effect on the grid.
  • the control strategy is shown in Figure 3. Among them, the adjustment of the AC power grid voltage at the receiving end can be realized by changing the reactive power setting value.
  • the frequency of the power grid is generally transmitted to the converter station on the wind farm side by means of Supervisory Control and Data Acquisition (SCADA) communication, which increases the cost and has poor reliability, and is not suitable for offshore wind farms. , so it is necessary to transmit the frequency information from the grid side to the wind farm side through the WFVSC.
  • SCADA Supervisory Control and Data Acquisition
  • the WFVSC controls the AC frequency of the wind farm.
  • This method utilizes the feature that the WFVSC can work in the frequency conversion mode, and manually couples the AC frequency at both ends by tracking the DC voltage change, so that the wind farm can perceive the affected frequency.
  • the frequency of the terminal AC power grid changes, and its own output is adjusted to balance the active power of the system.
  • the GSVSC first adjusts the DC voltage value, and uses the energy stored in the DC capacitor to suppress frequency fluctuations, while the WFVSC adjusts the wind farm side AC according to the change of the DC voltage. frequency, so that the wind farm senses the frequency change of the AC power grid at the receiving end to adjust its own output.
  • WFVSC frequency control can be expressed as:
  • WFVSC controls the frequency of the wind farm side, and should be controlled based on the initial frequency of the wind farm side (the frequency before the start of the variable frequency control), and the control strategy is shown in Figure 3.
  • the doubly-fed wind turbine In the normal operation control mode, the doubly-fed wind turbine generally operates in the MPPT mode.
  • the double-fed wind turbine can change speed within the range of ⁇ 30% of its rated speed, and can provide a large inertia support in a short time, even exceeding its inherent rotational inertia. Therefore, the rotor kinetic energy can be changed by adjusting the speed to respond to system frequency changes. . If the rotational speed of the doubly-fed fan changes from ⁇ r to ⁇ r + ⁇ r , the rotor kinetic energy variable ⁇ E K can be expressed as:
  • ⁇ r is the variation of the rotor speed of the doubly-fed wind turbine
  • J DFIG is the inherent moment of inertia of the doubly-fed wind turbine.
  • the change of the effective kinetic energy of the wind turbine includes two parts: the change of the actual kinetic energy of the fan rotor and the change of the wind power capture.
  • ⁇ EP is the change in the kinetic energy of the fan rotor
  • ⁇ E D is the change in the wind power capture of the fan.
  • the wind turbine cannot directly obtain the frequency change information of the AC power grid at the receiving end, and thus cannot control the rotor to absorb or release the stored kinetic energy to smooth the frequency deviation. Therefore, in order to realize the inertia support for the AC power grid at the receiving end, it is necessary to couple the output of the wind farm with the frequency change of the AC power grid at the receiving end.
  • a power variable P ad with frequency change information is added to become a new active power reference value
  • the action time of the converter is much smaller than the inertia response time of the mechanical system, so it can be considered that That is, the actual output power P WF of the wind turbine.
  • K I ⁇ f WF proportional controller realizes inertia control of DFIG
  • the differential controller realizes the electromagnetic power control function
  • Pad can be expressed as:
  • f WF is the AC side frequency of the wind farm side converter
  • f WF0 is the AC side frequency of the wind farm side converter
  • Initial frequency K I is the proportional coefficient of the PID controller
  • K D is the differential coefficient of the PID controller.
  • the wind power flexible DC grid-connected system can be equivalently regarded as a traditional synchronous machine with the total inertia support capacity of the wind turbine and the DC capacitor for the receiving system.
  • the inertia response capability of the flexible DC system and the wind farm is mobilized, which is stronger than the capability of using a single system for inertia support.
  • the inertia support capacity of the wind farm is determined by the speed regulation range of the fan speed. The greater the speed deviation of the fan speed, the stronger the support capacity.
  • the integrated GSVSC inertia control, WFVSC frequency control and wind farm active power adjustment constitute a coordinated control method with frequency modulation and inertia support for the AC power grid at the receiving end, as shown in Figure 3, U WF in Figure 3 is the wind farm side AC
  • U WFN is the rated value of the AC voltage on the wind farm side
  • PLL Phase Locked Loop
  • the reference value of the DC side voltage will be increased, and the converter station on the wind farm side will transmit the increased DC voltage to the wind farm to reduce the output and reduce the amplitude and rate of grid frequency fluctuations.
  • this application proposes a control method for coupling the frequency of the grid with the frequency of the wind farm by using the DC voltage, and coordinating the DC side capacitive energy storage of the flexible DC transmission system and the rotor kinetic energy of the doubly-fed wind turbine.
  • the whole system is equivalent to the AC power grid at the receiving end as a synchronous generator with both the DC system and the inertia of the wind turbine, which improves the inertia support capability of the AC power grid at the receiving end.
  • GSVSC grid-side converter
  • the AC side d-axis current component id is substituted into the PI controller to obtain the grid-side converter (GSVSC) AC-side d -axis voltage reference value U dref , based on U dref , the grid-side converter (GSVSC) AC side q-axis current
  • the component i q , the d-axis voltage component U td of the AC side of the grid-side converter (GSVSC), the inductance value of the grid-side converter (GSVSC) and the frequency of the AC grid at the receiving end determine the AC side d of the grid-side converter (GSVSC) Shaft modulation voltage U d ; substitute the measured reactive power value Q of the grid-side converter (GSVSC) and the reactive power reference value Qref output by the grid-side converter ( GSVSC ) into the PI controller to obtain grid-side commutation Substitute the reference value i qref of the q-axis current on the AC side of the grid-
  • variable frequency control stage of the wind farm side converter WFVSC
  • control methods are as follows:
  • FIG. 5 The schematic diagram of WFVSC double closed-loop control is shown in Figure 5.
  • U WFd is the d-axis component of the measured DC side voltage U dc of the wind farm side converter (WFVSC)
  • U WFq is the wind farm side converter.
  • WFVSC is the q-axis component of the measured DC side voltage U dc
  • U WFNd is the d-axis component of the DC side voltage rating U WFN of the wind farm side converter (WFVSC)
  • U WFNq is the wind farm side converter (WFVSC) DC side voltage rating U q-axis component of WFN
  • i dref is the d-axis current reference value of the AC side of the wind farm side converter (WFVSC)
  • i qref is the AC side of the wind farm side converter (WFVSC)
  • the reference value of the q-axis current, i d is the d-axis current on the AC side of the wind farm side converter (WFVSC), i q is the q-axis current on the AC side of the wind farm side converter (WFVSC), and L is the wind farm side converter (WFVSC) inductance value.
  • Embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may employ one or more computer-usable storage media (including but not limited to magnetic disk memory, Compact Disc Read-Only Memory, CD-ROM) having computer-usable program code embodied therein , optical storage, etc.) in the form of a computer program product.
  • computer-usable storage media including but not limited to magnetic disk memory, Compact Disc Read-Only Memory, CD-ROM
  • CD-ROM Compact Disc Read-Only Memory
  • 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 function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions
  • the apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

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  • Control Of Eletrric Generators (AREA)

Abstract

Sont divulgués un système et un procédé de commande de l'inertie d'un système connecté à un réseau d'énergie éolienne en mer. Le procédé de commande consiste à : lorsqu'un défaut se produit dans un réseau électrique c.a. au niveau d'une extrémité de réception, sur la base de la fréquence du réseau électrique c.a. au niveau de l'extrémité de réception, déterminer une valeur de référence de tension côté c.c. d'un convertisseur côté réseau d'un système VSC-HVDC dans un système connecté à un réseau d'énergie éolienne en mer ; utiliser une technologie de commande à double boucle fermée du convertisseur côté réseau pour réguler la tension côté c.c. du convertisseur côté réseau à la valeur de référence de tension côté c.c. du convertisseur côté réseau ; sur la base de la tension côté c.c. d'un convertisseur côté parc éolien du système VSC-HVDC, déterminer une valeur de référence de fréquence côté c.a. du convertisseur côté parc éolien, la tension côté c.c. du convertisseur côté parc éolien étant égale à la tension côté c.c. du convertisseur côté réseau ; utiliser une technologie de commande à double boucle fermée du convertisseur côté parc éolien pour réguler la fréquence côté c.a. du convertisseur côté parc éolien à la valeur de référence de fréquence côté c.a. du convertisseur côté parc éolien ; et utiliser la fréquence côté c.a. régulée du convertisseur côté parc éolien pour réguler la sortie de puissance active d'un parc éolien dans le système connecté au réseau d'énergie éolienne en mer.
PCT/CN2021/092929 2021-03-24 2021-05-11 Système et procédé de commande pour système connecté à un réseau d'énergie éolienne en mer WO2022198764A1 (fr)

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