CN115395560A - Rotating speed recovery method and system for double-fed wind generating set - Google Patents
Rotating speed recovery method and system for double-fed wind generating set Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/007—Control circuits for doubly fed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention discloses a method and a system for recovering the rotating speed of a double-fed wind generating set, which are characterized by comprising the following steps: acquiring the rotating speed of the double-fed wind generating set; determining the starting time of the rotating speed recovery control of the double-fed wind generating set; and performing time-varying calculation on the PI parameters, and determining a rotating speed recovery active power reference value of the double-fed wind generating set to perform rotating speed recovery of the double-fed wind generating set. The system comprises an acquisition module, a time determination module, a load shedding amount determination module, a power reference value determination module and a recovery module. The method has the advantages of being scientific and reasonable, strong in applicability, good in effect, and capable of effectively inhibiting the frequency secondary falling and guaranteeing the rotating speed recovery performance.
Description
Technical Field
The invention relates to operation control when a grid-connected double-fed wind generating set participates in system frequency modulation, in particular to a rotating speed recovery method and a rotating speed recovery system of the double-fed wind generating set.
Background
With the change of energy structures, the installed proportion of renewable energy sources is increasing day by day, and the access of high proportion of renewable energy sources and the electronization of high proportion of electric power become the main characteristics of an electric power system. Wind energy is generally considered as the renewable energy source with the most application prospect, and when large-scale wind power is connected into a power grid, the disturbance rejection capability of a power system is reduced because a wind turbine generator set does not have inertia response and frequency modulation capability. A doubly-fed induction generator (DFIG) has rich rotational inertia and a wide rotating speed adjusting range; by adding a frequency control loop in the DFIG rotor side controller, inertia response and primary frequency modulation characteristics of the synchronous machine are simulated, rotor kinetic energy of the synchronous machine is released, and frequency support is provided for a disturbed system. However, after the frequency modulation control is finished, the rotating speed of the fan is lower than the optimal rotating speed corresponding to Maximum Power Point Tracking (MPPT), so that the wind energy utilization rate is reduced, and the fan may stall due to too low rotating speed, so that the rotating speed recovery control must be performed after the fan participates in the frequency modulation, and the economic benefit and the system stability of the wind power plant are guaranteed. So far, no practical application related to the rotating speed recovery of the double-fed wind generating set is seen.
Disclosure of Invention
The invention aims to overcome the defects of power mutation and incapability of adapting to different working conditions in the conventional rotating speed recovery control based on constant coefficient PI control, introduces time-varying PI control gain, and provides a rotating speed recovery method and a rotating speed recovery system for a double-fed wind generating set, which are scientific, reasonable, high in applicability and good in effect and can ensure the rotating speed recovery performance while effectively inhibiting secondary frequency drop.
One of the technical schemes adopted for realizing the purpose of the invention is that a method for recovering the rotating speed of a double-fed wind generating set is characterized by comprising the following steps:
acquiring parameters of a double-fed wind generating set, wherein the parameters of the double-fed wind generating set comprise the rotating speed of the double-fed wind generating set;
determining the rotating speed recovery control starting time of the double-fed wind generating set according to the rotating speed of the double-fed wind generating set;
according to the rotating speed of the double-fed wind generating set, time-varying calculation is carried out on PI parameters, and the rotating speed recovery active power reduction capacity of the double-fed wind generating set is determined;
determining a rotating speed recovery active power reference value of the double-fed wind generating set according to the rotating speed recovery control starting time and the rotating speed recovery active power reduction capacity;
and recovering the rotating speed of the doubly-fed wind generating set according to the rotating speed recovery active power reference value.
Further, according to the rotating speed of the doubly-fed wind generating set, determining the rotating speed recovery control starting time of the doubly-fed wind generating set, comprising:
determining the minimum value of the rotating speed of the double-fed wind generating set in the frequency supporting stage according to the rotating speed of the double-fed wind generating set;
and determining the rotation speed recovery control starting time of the double-fed wind generating set according to the minimum value of the rotation speed of the double-fed wind generating set.
Further, according to the rotating speed of the double-fed wind generating set, time-varying calculation is performed on the PI parameter, and the rotating speed recovery active power reduction capacity of the double-fed wind generating set is determined, and the method comprises the following steps:
the PI parameter is subjected to time-varying calculation according to the rotating speed of the double-fed wind generating set and the rotating speed recovery PI controller parameter expression of the double-fed wind generating set, and a rotating speed recovery PI control time-varying parameter of the double-fed wind generating set is obtained;
and determining the rotating speed recovery active power reduction capacity of the doubly-fed wind generating set with time varying PI parameters according to the rotating speed of the doubly-fed wind generating set, the rotating speed recovery PI control time varying parameters of the doubly-fed wind generating set and the rotating speed recovery active power reduction capacity expression formula of the doubly-fed wind generating set.
Further, the PI controller parameter expression:
in the formula, k P Is a proportional control coefficient; k is a radical of I Is an integral control coefficient; a is P And a I Are each k P And k I The proportionality coefficient of (a); t is t off Controlling the starting for the rotating speed recovery of the double-fed wind generating set; omega (t) off ) Is t off The rotor speed of the doubly-fed wind generating set is constantly; wherein, for k P 、k I Introducing a time-varying proportionality coefficient to construct variable coefficient PI controlled double-fed wind turbine generator rotating speed recovery; omega r The rotating speed of the double-fed wind generating set.
Further, the expression formula of the active power reduction capacity of the double-fed wind turbine generator during rotating speed recovery is as follows:
ΔP(t)＝k P (ω 0 -ω r )+k I ∫(ω 0 -ω r )dt
in the formula, ω 0 The rotor speed of the double-fed wind turbine generator set before disturbance is obtained; delta P (t) is the rotating speed recovery active power reduction capacity of the double-fed wind turbine generator set; k is a radical of P Is a proportional control coefficient; k is a radical of I Is an integral control coefficient; omega r The rotating speed of the double-fed wind generating set is obtained; omega 0 -ω r The method is characterized in that the rotating speed deviation of the doubly-fed wind turbine generator is used as the input of the rotating speed recovery PI control of the doubly-fed wind turbine generator, and the delta P (t) is used as the output of the PI rotating speed recovery control。
Further, the determining a reference value of the rotating speed recovery active power of the doubly-fed wind generating set according to the rotating speed recovery control starting time and the rotating speed recovery active power reduction capacity includes:
and determining a rotating speed recovery active power reference value of the doubly-fed wind generating set according to the rotating speed of the doubly-fed wind generating set, the rotating speed recovery active power reduction capacity of the doubly-fed wind generating set and the rotating speed recovery active power expression of the doubly-fed wind generating set.
Further, the expression of the active power recovered by the rotating speed of the doubly-fed wind generating set is as follows:
P W (t)＝P MPPT (t)+ΔP W (t)-ΔP(t)
in the formula, P MPPT Tracking the output power in the operating mode for the maximum power; delta P W Electromagnetic power participating in frequency modulation and power increase for the DFIG;
further, the rotating speed recovery of the doubly-fed wind generating set according to the rotating speed recovery active power reference value comprises the following steps:
and restoring the rotating speed of the double-fed wind generating set to an initial value according to the rotating speed restoring active power reference value of the double-fed wind generating set.
The second technical scheme adopted for realizing the purpose of the invention is that the rotating speed recovery system of the double-fed wind generating set is characterized by comprising the following components:
the acquisition module is used for acquiring parameters of the double-fed wind generating set, wherein the parameters of the double-fed wind generating set comprise the rotating speed of the double-fed wind generating set;
the time determining module is used for determining the rotating speed recovery control starting time of the double-fed wind generating set according to the rotating speed of the double-fed wind generating set;
the load reduction capacity determining module is used for performing time-varying calculation on the PI parameters according to the rotating speed of the double-fed wind generating set and determining the rotating speed recovery active load reduction capacity of the double-fed wind generating set;
the power reference value determining module is used for determining a rotating speed recovery active power reference value of the double-fed wind generating set according to the rotating speed recovery control starting time and the rotating speed recovery active power reduction amount;
and the recovery module is used for recovering the rotating speed of the doubly-fed wind generating set according to the rotating speed recovery active power reference value.
Further, a computer device is provided, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 8 when executing the computer program.
The rotating speed recovery method and the rotating speed recovery system of the double-fed wind generating set have the beneficial effects that:
determining the starting time of the rotating speed recovery control of the double-fed wind generating set according to the moment when the minimum rotating speed value of the double-fed wind generating set appears, then performing time-varying calculation according to the rotating speed of the double-fed wind generating set and PI parameters, and determining the rotating speed recovery active power reduction amount of the double-fed wind generating set; determining a rotating speed recovery active power reference value of the double-fed wind generating set according to the rotating speed recovery control starting time and the rotating speed recovery active power reduction amount; the rotating speed of the double-fed wind generating set is recovered according to the rotating speed recovery active power reference value, the active power of the double-fed wind generating set is slowly reduced, the problems that the traditional rotating speed recovery method of the double-fed wind generating set cannot adapt to different working conditions, the power burst still exists at the rotating speed recovery initial stage of the double-fed wind generating set and the like are solved, and the suppression of frequency secondary falling and the rotating speed recovery performance of the double-fed wind generating set are both realized.
Drawings
FIG. 1 is a control block diagram of a rotating speed recovery method of a doubly-fed wind generating set in the embodiment of the invention;
FIG. 2 is a schematic block diagram of a rotating speed recovery method for a double-fed wind generating set according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an emulation system in an embodiment of the present invention;
FIG. 4 (a) is a plot of system frequency at disturbance 90MW, wind penetration 20% in an example of the invention;
FIG. 4 (b) is a rotor speed diagram of the doubly-fed wind generating set at 90MW disturbance and 20% wind permeability in the example of the invention;
FIG. 4 (c) is a graph of the active power output of the doubly-fed wind turbine generator set at disturbance 90MW and wind power permeability of 20% in the example of the invention;
FIG. 4 (d) is a plot of PI control output power at 90MW perturbation, 20% wind penetration in an example of the invention;
FIG. 5 (a) is a plot of system frequency at disturbance 150MW, wind penetration 20% in an example of the invention;
FIG. 5 (b) is a rotor speed diagram of the doubly-fed wind generating set at disturbance 150MW and wind power permeability of 20% in the embodiment of the invention;
FIG. 5 (c) is a graph of the active power output of the doubly-fed wind turbine generator set under the disturbance of 150MW and the wind power permeability of 20% in the example of the invention;
FIG. 5 (d) is a plot of PI control output power at disturbance 150MW, wind penetration 20% in an example of the invention;
FIG. 6 (a) is a plot of system frequency at 150MW wind penetration 40% in an example of the invention;
FIG. 6 (b) is a rotor speed diagram of the doubly-fed wind generating set at 150MW and wind power permeability of 40% in the example of the invention;
FIG. 6 (c) is a graph of the active power output of the doubly-fed wind turbine generator set under 150MW disturbance and 40% wind permeability in the example of the invention;
FIG. 6 (d) is a plot of PI control output power at disturbance 150MW, wind penetration 40% in an example of the invention;
FIG. 7 is a schematic block diagram of a rotating speed recovery system of a doubly-fed wind generating set according to an embodiment of the present invention;
FIG. 8 is a schematic block diagram of a computer apparatus in an embodiment of the invention.
Detailed Description
In FIG. 1,. Omega. r For the rotation speed, omega, of a doubly-fed wind generator set 0 Is the initial rotation speed, omega (t), of the doubly-fed wind generating set off ) Is t off Rotor speed a of a doubly-fed wind turbine at any moment P And a I Respectively, proportional control coefficient k P And integral control coefficient k I P (t) is the rotating speed recovery active power reduction capacity of the doubly-fed wind turbine generator; in FIG. 2, U ra 、U rb 、U rc And U ga 、U gb 、U gc The ABC three-phase voltages of a double-fed-inductor generator (DFIG) on a rotor side and a stator side are respectively provided.
Referring to fig. 1 and fig. 2, the method for recovering the rotating speed of the doubly-fed wind generating set of the invention comprises the following steps:
acquiring parameters of a double-fed wind generating set, wherein the parameters of the double-fed wind generating set comprise the rotating speed of the double-fed wind generating set;
determining the rotation speed recovery control starting time of the double-fed wind generating set according to the rotation speed of the double-fed wind generating set;
according to the rotating speed of the double-fed wind generating set, time-varying calculation is carried out on PI parameters, and the rotating speed recovery active power reduction capacity of the double-fed wind generating set is determined;
determining a rotating speed recovery active power reference value of the double-fed wind generating set according to the rotating speed recovery control starting time and the rotating speed recovery active power reduction amount;
and recovering the rotating speed of the doubly-fed wind generating set according to the rotating speed recovery active power reference value.
And determining the rotating speed recovery control starting time of the doubly-fed wind generating set according to the rotating speed of the doubly-fed wind generating set, wherein the method comprises the following steps:
determining the minimum value of the rotating speed of the double-fed wind generating set in the frequency supporting stage according to the rotating speed of the double-fed wind generating set;
and determining the rotation speed recovery control starting time of the double-fed wind generating set according to the minimum value of the rotation speed of the double-fed wind generating set.
And detecting the minimum value of the rotating speed and the rotating speed of the doubly-fed wind generating set, and taking the moment corresponding to the minimum value as the rotating speed recovery control starting time of the doubly-fed wind generating set when the minimum value is detected.
According to the rotating speed of the double-fed wind generating set, time-varying calculation is carried out on the PI parameter, and the rotating speed recovery active power reduction capacity of the double-fed wind generating set is determined, and the method comprises the following steps:
the PI parameter is subjected to time-varying calculation according to the rotating speed of the double-fed wind generating set and the rotating speed recovery PI controller parameter expression of the double-fed wind generating set, and a rotating speed recovery PI control time-varying parameter of the double-fed wind generating set is obtained;
the PI controller parameter expression is as follows:
in the formula, k P Is a proportional control coefficient; k is a radical of I Is an integral control coefficient; a is P And a I Are each k P And k I The proportionality coefficient of (a); t is t off Controlling starting for the rotating speed recovery of the double-fed wind generating set; omega (t) off ) Is t off The rotor speed of the doubly-fed wind generating set is constantly; wherein, for k P 、k I Introducing a time-varying proportionality coefficient to construct the rotating speed recovery of the variable coefficient PI controlled doubly-fed wind generating set; omega r The rotating speed of the double-fed wind generating set.
And the rotating speed of the double-fed wind generating set is a time variable, a PI controller parameter expression is recovered based on the rotating speed of the double-fed wind generating set, and PI parameters are calculated in a time-varying mode.
And determining the rotating speed recovery active load reduction amount of the doubly-fed wind generating set with time varying PI parameters according to the rotating speed of the doubly-fed wind generating set, the rotating speed recovery PI control time varying parameter of the doubly-fed wind generating set and the rotating speed recovery active load reduction amount expression formula of the doubly-fed wind generating set.
The expression formula of the double-fed wind generating set for restoring the rotating speed and the active power reduction capacity is as follows:
ΔP(t)＝k P (ω 0 -ω r )+k I ∫(ω 0 -ω r )dt
in the formula, ω 0 The rotor speed of the double-fed wind generating set before disturbance is obtained; Δ P (t) isThe rotating speed of the double-fed wind generating set restores the active power reduction amount; k is a radical of P Is a proportional control coefficient; k is a radical of formula I Is an integral control coefficient; omega r The rotating speed of the double-fed wind generating set is obtained; omega 0 -ω r The rotating speed deviation of the double-fed wind generating set is used as the input of the rotating speed recovery PI control of the double-fed wind generating set, and the delta P (t) is used as the output of the PI rotating speed recovery control.
And the delta P (t) is the rotating speed recovery active power reduction capacity of the double-fed wind generating set and is obtained through PI rotating speed recovery control.
The method for determining the rotating speed recovery active power reference value of the doubly-fed wind generating set according to the rotating speed recovery control starting time and the rotating speed recovery active power reduction capacity comprises the following steps:
and determining a rotating speed recovery active power reference value of the doubly-fed wind generating set according to the rotating speed of the doubly-fed wind generating set, the rotating speed recovery active power reduction amount of the doubly-fed wind generating set and the rotating speed recovery active power expression of the doubly-fed wind generating set.
The rotating speed recovery active power expression of the doubly-fed wind generating set is as follows:
P W (t)＝P MPPT (t)+ΔP W (t)-ΔP(t)
in the formula, P MPPT Tracking the output power in the operating mode for the maximum power; delta P W Electromagnetic power participating in frequency modulation and power increase for the DFIG; wherein, P W And (t) is an active power reference value for rotating speed recovery of the doubly-fed wind generating set.
The rotating speed recovery of the doubly-fed wind generating set according to the rotating speed recovery active power reference value comprises the following steps:
and restoring the rotating speed of the double-fed wind generating set to an initial value according to the rotating speed restoring active power reference value of the double-fed wind generating set.
And the back-to-back converter module of the double-fed wind generating set recovers the active power reference value according to the rotating speed of the double-fed wind generating set to obtain the rotor voltage, and the rotating speed of the double-fed wind generating set is tracked to recover the active power reference value until the rotating speed is recovered to the initial value.
Referring to fig. 7, a rotating speed recovery system of a doubly-fed wind turbine generator system includes:
the system comprises an acquisition module 1, a control module and a control module, wherein the acquisition module is used for acquiring parameters of the double-fed wind generating set, and the parameters of the double-fed wind generating set comprise the rotating speed of the double-fed wind generating set;
the time determining module 2 is used for determining the rotating speed recovery control starting time of the double-fed wind generating set according to the rotating speed of the double-fed wind generating set;
the load reduction amount determining module 3 is used for performing time-varying calculation on the PI parameter according to the rotating speed of the double-fed wind generating set and determining the rotating speed recovery active load reduction amount of the double-fed wind generating set;
the power reference value determining module 4 is used for determining a rotating speed recovery active power reference value of the double-fed wind generating set according to the rotating speed recovery control starting time and the rotating speed recovery active power reduction amount;
and the recovery module 5 is used for recovering the rotating speed of the double-fed wind generating set according to the rotating speed recovery active power reference value, and the back-to-back converter module of the double-fed wind generating set recovers the active power reference value according to the rotating speed of the double-fed wind generating set to obtain the rotor voltage and tracks the rotating speed of the double-fed wind generating set to recover the active power reference value until the rotating speed is recovered to the initial value.
In an alternative embodiment, the time determination module 2 is configured to:
determining the minimum value of the rotating speed of the double-fed wind generating set in the frequency supporting stage according to the rotating speed of the double-fed wind generating set;
and determining the rotation speed recovery control starting time of the double-fed wind generating set according to the minimum value of the rotation speed of the double-fed wind generating set.
In an alternative embodiment, the load shedding amount determining module 3 is configured to:
the PI parameter is subjected to time-varying calculation according to the rotating speed of the double-fed wind generating set and the rotating speed recovery PI controller parameter expression of the double-fed wind generating set, and a rotating speed recovery PI control time-varying parameter of the double-fed wind generating set is obtained;
and determining the rotating speed recovery active power reduction capacity of the doubly-fed wind generating set with time-varying PI parameters according to the rotating speed of the doubly-fed wind generating set, the rotating speed recovery PI control time-varying parameters of the doubly-fed wind generating set and the rotating speed recovery active power reduction capacity expression formula of the doubly-fed wind generating set.
In an alternative embodiment, the PI controller parameter expression:
in the formula, k P Is a proportional control coefficient; k is a radical of I Is an integral control coefficient; a is P And a I Are each k P And k I The proportionality coefficient of (a); t is t off Controlling starting for the rotating speed recovery of the double-fed wind generating set; omega (t) off ) Is t off The rotor speed of the doubly-fed wind generating set is constantly; wherein, for k P 、k I Introducing a time-varying proportionality coefficient to construct the rotating speed recovery of the variable coefficient PI controlled doubly-fed wind generating set; omega r The rotating speed of the double-fed wind generating set.
In an optional embodiment, the expression of the rotating speed recovery active power reduction capacity of the doubly-fed wind turbine generator is as follows:
ΔP(t)＝k P (ω 0 -ω r )+k I ∫(ω 0 -ω r )dt
in the formula, ω 0 The rotor speed of the double-fed wind generating set before disturbance is obtained; delta P (t) is the rotating speed recovery active power reduction capacity of the double-fed wind generating set; k is a radical of P Is a proportional control coefficient; k is a radical of I Is an integral control coefficient; omega r The rotating speed of the double-fed wind generating set is set; omega 0 -ω r The rotating speed deviation of the double-fed wind generating set is used as the input of the rotating speed recovery PI control of the double-fed wind generating set, and the delta P (t) is used as the output of the PI rotating speed recovery control.
In an alternative embodiment, the power reference value determining module 4 is configured to:
and determining a rotating speed recovery active power reference value of the doubly-fed wind generating set according to the rotating speed of the doubly-fed wind generating set, the rotating speed recovery active power reduction capacity of the doubly-fed wind generating set and the rotating speed recovery active power expression of the doubly-fed wind generating set.
In an optional embodiment, the rotating speed recovery active power expression of the doubly-fed wind turbine generator set is as follows:
P W (t)＝P MPPT (t)+ΔP W (t)-ΔP(t)
in the formula, PMPPT is output power in the maximum power tracking operation mode; and delta PW is the electromagnetic power of the DFIG participating in frequency modulation and power increase.
In an alternative embodiment, the recovery module 5 is configured to:
and restoring the rotating speed of the double-fed wind generating set to an initial value according to the rotating speed restoring active power reference value of the double-fed wind generating set.
In the embodiment of the invention, the rotating speed recovery control starting time of the double-fed wind generating set is determined according to the occurrence moment of the minimum rotating speed of the double-fed wind generating set, then time-varying calculation is carried out according to the rotating speed of the double-fed wind generating set and PI parameters, and the rotating speed recovery active power reduction capacity of the double-fed wind generating set is determined; determining a rotating speed recovery active power reference value of the double-fed wind generating set according to the rotating speed recovery control starting time and the rotating speed recovery active power reduction capacity; and the rotating speed of the double-fed wind generating set is recovered according to the rotating speed recovery active power reference value, the active power of the double-fed wind generating set is slowly reduced, the problems that the traditional rotating speed recovery method of the double-fed wind generating set cannot adapt to different working conditions, the power of the double-fed wind generating set still suddenly occurs at the rotating speed recovery initial stage and the like are solved, and the suppression of frequency secondary falling and the rotating speed recovery performance of the double-fed wind generating set are realized.
Referring to fig. 8, a computer device comprises a memory 6, a processor 7 and a computer program stored on the memory 6 and executable on the processor 7, the processor 7 implementing the steps of the method when executing the computer program.
The computer device may include: an input device 8 and an output device 9. The memory 6, the processor 7, the input device 8 and the output device 9 may be connected by a bus or other means, and the processor 7 may be a Micro Controller Unit (MCU) which appropriately reduces the frequency and specification of a Central Processing Unit (CPU) and performs different combination control for different application occasions, so that the device has strong pertinence and good economical efficiency. The Processor 7 may also be other general purpose processors, digital Signal Processors (DSPs), reduced instruction set computer microprocessors (ARM), field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or any combination thereof. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The memory 6 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created from use of the wind turbine generator model, and the like. Further, the memory 6 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 6 optionally comprises a memory remotely located with respect to the processor 7, which may be connected to the doubly-fed wind turbine generator set speed recovery system via a network. The input device 9 may receive a calculation request (or other numerical or character information) input by a user and generate a key signal input related to the speed recovery system of the doubly-fed wind turbine generator set. The output device 9 may include a display device such as a display screen for outputting the calculation result.
The technical effects of the present invention will be described in detail with reference to the simulation examples.
In order to verify the effectiveness of the rotating speed recovery method of the doubly-fed wind generating set under different disturbance and wind power permeability scenes, a power system model with high wind power permeability is built on an EMTP-RV simulation platform, as shown in FIG. 3, the system comprises a thermal power plant comprising 6 synchronous generators, a polymerization wind power plant comprising the doubly-fed wind generating set, an asynchronous motor and a static load of 350 MW.
And (5) verifying by adopting a method of controlling variables. The synchronous generator SG4 is cut off as a power disturbance event in 50s, the control method shown in FIG. 2 is adopted in the frequency supporting stage, and the control method is adopted at t off Compared with a traditional rotating speed recovery method (the doubly-fed wind generating set quits frequency modulation) and a rotating speed recovery method (k) of the doubly-fed wind generating set with fixed PI coefficient by starting the rotating speed recovery method of the doubly-fed wind generating set at any moment P ＝1.5，k I = 0.1) and variable PI coefficient double-fed wind generating set rotating speed recovery method (a) P ＝5，a I And = 2), under different disturbances and different wind power permeabilities, the rotating speed recovery and frequency secondary drop of the double-fed wind generating set are realized by the three rotating speed recovery methods. The example settings are shown in table 1.
TABLE 1 example set-up
When the wind power permeability is 20% and the wind power permeability is 90MW in disturbance, as can be seen from fig. 4 (a) and 4 (b), when the double-fed wind generating set adopts the conventional rotating speed recovery method, the rotating speed of the rotor of the double-fed wind generating set is quickly recovered, the rotating speed of the double-fed wind generating set is recovered to a steady state value in 95s, but the frequency support control is directly removed to cause 0.116pu power sudden change, so that serious frequency secondary drop is caused, and the frequency drops to 49.687Hz. When the double-fed wind generating set adopts a fixed PI coefficient rotating speed recovery method, the rotating speed recovery of the rotor of the double-fed wind generating set is slowed until the rotating speed of the rotor of the double-fed wind generating set recovers stably in 120s, but the frequency secondary drop is improved, and the lowest point of the frequency secondary drop is increased to 49.716Hz, which is mainly because the active load reduction characteristic of 'inhibiting before raising' is preliminarily constructed based on the PI rotating speed recovery control method, as shown in figures 4 (c) and 4 (d), however, in the initial stage of the rotating speed recovery of the double-fed wind generating set, the P controller occupies the dominant position, and the power sudden drop still exists in the initial stage of the rotating speed recovery, but compared with the traditional rotating speed recovery methodThe control is reduced by 0.082pu, so that the frequency secondary drop is inhibited; and the controller I takes a dominant position along with the increase of time, and the controller I eliminates the steady-state error through error accumulation, but prolongs the rotating speed recovery time of the double-fed wind generating set due to smaller and unchanged control gain. When the double-fed wind generating set adopts the variable coefficient PI control double-fed wind generating set rotating speed recovery method provided by the invention, as k is used for controlling the rotating speed of the double-fed wind generating set P 、k I Difference from rotational speed (omega) r -ω(t off ) A coupling relation exists, so that the delta P can be increased from 0, an output curve of 'first suppression and then rising' is constructed, as shown in fig. 4 (d), in the initial stage of rotating speed recovery, the doubly-fed wind generating set starts rotating speed recovery control ('first suppression' characteristic) under the condition that the delta P is 0, no power mutation exists, and the frequency secondary falling is effectively suppressed from the root; increasing with time, k P 、k I Following omega r -ω(t off ) And increasing the speed, and when the speed is increased by 105s, the delta P exceeds the delta P of the constant PI coefficient speed recovery method (the backward-rising characteristic), so that the speed recovery of the double-fed wind generating set is accelerated.
Under a large disturbance scene, namely when the disturbance power is increased from 90MW to 150MW, as shown in fig. 5 (a) and 5 (b), when a traditional rotation speed recovery method and a fixed PI coefficient rotation speed recovery method are adopted, the frequency secondary drop of the doubly-fed wind generating set is more serious, and the frequency secondary drop is respectively reduced to 49.296Hz and 49.340Hz when entering the lowest point; the time for the rotor speed of the doubly-fed wind generating set to recover to be stable is prolonged to 80s and 135s respectively. When the double-fed wind generating set adopts the rotating speed recovery method of the double-fed wind generating set, the frequency secondary falling is avoided, and the rotating speed is recovered to be stable within 98 s. As shown in fig. 5 (c) and 5 (d). The main reason is that the control method provided by the invention can effectively inhibit the power sudden change of the double-fed wind generating set at the initial stage of rotating speed recovery, eliminate the frequency secondary drop, and ensure the rotating speed recovery performance from the perspective of the double-fed wind generating set.
Under the condition of improving the wind power permeability, the disturbance is 150MW, the wind power permeability is increased from 20% to 40%, and according to the graphs in fig. 6 (a) and 6 (b), when a high wind power permeability system is greatly disturbed, the secondary drop of the system frequency is more serious than that of a low wind power permeability scene, when the traditional rotating speed recovery method and the constant PI coefficient rotating speed recovery method are adopted, the lowest points of the secondary drop of the frequency are respectively 48.974Hz and 49.094Hz, and are smaller than the lowest point of the primary drop of the frequency, so that the system stability is greatly damaged; the rotor speed of the doubly-fed wind generating set is recovered to be stable at 84s and 155s respectively. When the variable coefficient PI control rotating speed recovery method provided by the invention is adopted, the output power of the PI controller and the active power output of the fan are shown in FIGS. 6 (c) and 6 (d). And the rotating speed of the double-fed wind generating set is quickly recovered without frequency secondary drop.
From the simulation results, compared with the traditional rotating speed recovery method and the fixed PI coefficient rotating speed recovery method, the control method provided by the invention can effectively reduce the frequency secondary drop caused by the power mutation at the initial rotating speed recovery stage of the double-fed wind generating set, can also gradually increase the active reduction capacity of the double-fed wind generating set to accelerate the rotating speed recovery, and has the characteristics of considering the performance of inhibiting the frequency secondary drop and the rotating speed recovery.
The above example also illustrates feasibility and effectiveness of the rotating speed recovery method for the doubly-fed wind generating set.
It should be emphasized that the above-described embodiments further illustrate the objects, aspects and effects of the present invention in detail. It should be understood that the above-described examples are intended to be illustrative only and not limiting, and that all equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A rotating speed recovery method of a doubly-fed wind generating set is characterized by comprising the following steps:
acquiring parameters of a double-fed wind generating set, wherein the parameters of the double-fed wind generating set comprise the rotating speed of the double-fed wind generating set;
determining the rotation speed recovery control starting time of the double-fed wind generating set according to the rotation speed of the double-fed wind generating set;
according to the rotating speed of the double-fed wind generating set, time-varying calculation is carried out on PI parameters, and the rotating speed recovery active power reduction capacity of the double-fed wind generating set is determined;
determining a rotating speed recovery active power reference value of the double-fed wind generating set according to the rotating speed recovery control starting time and the rotating speed recovery active power reduction amount;
and recovering the rotating speed of the doubly-fed wind generating set according to the rotating speed recovery active power reference value.
2. The method for recovering the rotating speed of the doubly-fed wind turbine generator set according to claim 1, wherein the determining of the rotating speed recovery control starting time of the doubly-fed wind turbine generator set according to the rotating speed of the doubly-fed wind turbine generator set comprises:
determining the minimum value of the rotating speed of the double-fed wind generating set in the frequency supporting stage according to the rotating speed of the double-fed wind generating set;
and determining the rotation speed recovery control starting time of the double-fed wind generating set according to the minimum value of the rotation speed of the double-fed wind generating set.
3. The method for recovering the rotating speed of the doubly-fed wind turbine generator set according to claim 1, wherein the step of performing time-varying calculation on the PI parameter according to the rotating speed of the doubly-fed wind turbine generator set to determine the rotating speed recovery active power reduction capacity of the doubly-fed wind turbine generator set comprises the following steps:
the PI parameter is subjected to time-varying calculation according to the rotating speed of the double-fed wind generating set and the rotating speed recovery PI controller parameter expression of the double-fed wind generating set, and a rotating speed recovery PI control time-varying parameter of the double-fed wind generating set is obtained;
and determining the rotating speed recovery active power reduction capacity of the doubly-fed wind generating set with time-varying PI parameters according to the rotating speed of the doubly-fed wind generating set, the rotating speed recovery PI control time-varying parameters of the doubly-fed wind generating set and the rotating speed recovery active power reduction capacity expression formula of the doubly-fed wind generating set.
4. The rotating speed recovery method of the doubly-fed wind turbine generator set according to claim 3, wherein the parameter expression of the PI controller is as follows:
in the formula, k P Is a proportional control coefficient; k is a radical of formula I Is an integral control coefficient; a is P And a I Are each k P And k I The proportionality coefficient of (a); t is t off Controlling the starting for the rotating speed recovery of the double-fed wind generating set; omega (t) off ) Is t off The rotor rotating speed of the doubly-fed wind turbine generator is constantly set; wherein, for k P 、k I Introducing a time-varying proportional coefficient to construct the rotating speed recovery of the variable coefficient PI controlled doubly-fed wind turbine generator; omega r The rotating speed of the double-fed wind generating set.
5. The method for recovering the rotating speed of the doubly-fed wind turbine generator set according to claim 3, wherein the expression of the active power reduction amount of the rotating speed recovery of the doubly-fed wind turbine generator set is as follows:
ΔP(t)＝k P (ω 0 -ω r )+k I ∫(ω 0 -ω r )dt
in the formula, ω 0 The rotor speed of the doubly-fed wind turbine generator before disturbance is obtained; delta P (t) is the rotating speed recovery active power reduction capacity of the double-fed wind turbine generator set; k is a radical of P Is a proportional control coefficient; k is a radical of I Is an integral control coefficient; omega r The rotating speed of the double-fed wind generating set is obtained; omega 0 -ω r The method is characterized in that the rotating speed deviation of the double-fed wind generating set is used as the input of the rotating speed recovery PI control of the double-fed wind generating set, and the delta P (t) is used as the output of the PI rotating speed recovery control.
6. The rotating speed recovery method of the doubly-fed wind turbine generator set according to claim 1, wherein the determining of the rotating speed recovery active power reference value of the doubly-fed wind turbine generator set according to the rotating speed recovery control starting time and the rotating speed recovery active power reduction amount comprises:
and determining a rotating speed recovery active power reference value of the doubly-fed wind generating set according to the rotating speed of the doubly-fed wind generating set, the rotating speed recovery active power reduction capacity of the doubly-fed wind generating set and the rotating speed recovery active power expression of the doubly-fed wind generating set.
7. The rotating speed recovery method of the doubly-fed wind turbine generator set according to claim 2, wherein the rotating speed recovery active power expression of the doubly-fed wind turbine generator set is as follows:
P W (t)＝P MPPT (t)+ΔP W (t)-ΔP(t)
in the formula, P MPPT Tracking the output power in the operating mode for the maximum power; delta P W And the DFIG is subjected to frequency modulation and frequency increase electromagnetic power.
8. The method for recovering the rotating speed of the doubly-fed wind turbine generator set according to claim 1, wherein the recovering the rotating speed of the doubly-fed wind turbine generator set according to the rotating speed recovery active power reference value comprises the following steps:
and restoring the rotating speed of the double-fed wind generating set to an initial value according to the rotating speed restoring active power reference value of the double-fed wind generating set.
9. A double-fed wind generating set rotation speed recovery system is characterized in that the system comprises:
the acquisition module is used for acquiring parameters of the double-fed wind generating set, wherein the parameters of the double-fed wind generating set comprise the rotating speed of the double-fed wind generating set;
the time determining module is used for determining the rotating speed recovery control starting time of the double-fed wind generating set according to the rotating speed of the double-fed wind generating set;
the load reduction capacity determining module is used for performing time-varying calculation on the PI parameters according to the rotating speed of the double-fed wind generating set and determining the rotating speed recovery active load reduction capacity of the double-fed wind generating set;
the power reference value determining module is used for determining a rotating speed recovery active power reference value of the double-fed wind generating set according to the rotating speed recovery control starting time and the rotating speed recovery active power reduction amount;
and the recovery module is used for recovering the rotating speed of the doubly-fed wind generating set according to the rotating speed recovery active power reference value.
10. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method of any of claims 1 to 8 are implemented when the computer program is executed by the processor.
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| CN116316906B (en) * | 2023-02-28 | 2024-05-17 | 山东大学 | Active power recovery self-adaptive setting method and system after fault ride-through of doubly-fed wind turbine generator |
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