CN112398147B - Self-adaptive adjustment offshore wind power subsynchronous oscillation suppression system and method - Google Patents
Self-adaptive adjustment offshore wind power subsynchronous oscillation suppression system and method 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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
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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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- 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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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a self-adaptively adjusted sub-synchronous oscillation suppression system and a self-adaptively adjusted sub-synchronous oscillation suppression method for offshore wind power, wherein the system comprises the following steps: suppressing subsynchronous oscillation by a super capacitor attached to an outlet bus of an offshore wind farm, a super capacitor control system and a damping control loop of the super capacitor; the damping control loop is used for outputting a control signal to the super capacitor control system, and the super capacitor control system adjusts the super capacitor through the control signal; the damping control loop includes: the device comprises a dynamic signal extraction module, a preposed signal processing module, a filtering module, a proportional phase-shifting amplification module and a self-adaptive adjustment module; the adaptive adjustment module is used for adaptively adjusting parameters of the preposed signal processing module, the filtering module and the proportional phase shifting amplification module. The invention can effectively inhibit subsynchronous oscillation which endangers the stable operation of the system.
Description
Technical Field
The invention relates to the technical field of new energy power generation, in particular to a self-adaptive adjustment system and method for suppressing sub-synchronous oscillation of offshore wind power.
Background
With the gradual depletion of traditional energy and the continuous attention to environmental protection in the global scope, in recent years, renewable energy power generation technology represented by wind power is rapidly developed, and the grid-connected capacity of new energy such as wind power generation and the like is continuously increased. Offshore wind power has the characteristics of abundant resources, high electricity generation utilization hours, no land occupation, no water resource consumption and suitability for large-scale development, and becomes the development direction of future wind power generation. Compared with the traditional high-voltage direct-current transmission technology, the flexible direct-current transmission technology has the advantages that a filtering device is not needed, the phase commutation does not fail, power can be supplied to a passive network, and the like. Meanwhile, the control capability of the flexible direct current transmission system on alternating voltage is suitable for transmission of wind power generation, the wind current which is disturbed in the offshore wind power plant can cause flickering of wind power generation voltage, the voltage can be stabilized at a constant value by the flexible direct current transmission system through a voltage control strategy, the voltage stability of the grid-connected system is improved, voltage fluctuation and flickering of the grid-connected wind power plant are restrained, and the electric energy quality of the grid-connected system is improved. Therefore, the flexible direct current transmission technology is the best grid-connected scheme for high-capacity offshore wind power at present. However, the interaction between the power electronic converter of the flexible direct-current transmission system and the offshore wind farm can cause subsynchronous oscillation, damage the safety of equipment, reduce the power quality and influence the stable operation of the power system. The frequency of the sub-synchronous oscillation phenomenon of the offshore wind power grid-connected system caused by the above has led domestic and foreign scholars to pay extensive attention to and research on the occurrence mechanism and inhibition measures of the marine wind power grid-connected system. The subsynchronous oscillation caused by the offshore wind farm and the flexible direct-current transmission system has a great influence on a generator set shafting in a power grid, and can cause the generator set shafting to be damaged in serious conditions, so that the safety and stability of the whole power system are threatened greatly. Therefore, subsynchronous oscillation suppression of the offshore wind power grid-connected system is extremely important, and the research on the subsynchronous oscillation suppression has important value and significance for full absorption of offshore wind power plants.
Disclosure of Invention
The embodiment of the invention provides a self-adaptively adjusted offshore wind power subsynchronous oscillation suppression system, which can suppress the subsynchronous oscillation of an offshore wind power plant grid-connected system by adding a super capacitor and a super capacitor control system on an offshore wind power plant outlet bus, and carry out dynamic suppression through self-adaptive adjustment, thereby improving the dynamic characteristic of offshore wind power grid-connected operation and effectively suppressing the subsynchronous oscillation endangering the stable operation of the system.
In a first aspect, an embodiment of the present invention provides a self-adaptive adjustment offshore wind power subsynchronous oscillation suppression system, which is used for controlling and adjusting a super capacitor attached to an outlet bus of an offshore wind farm, and includes: the damping control loop and the super capacitor control system are added on the super capacitor;
the damping control loop is used for outputting a control signal to the super capacitor control system, and the super capacitor control system adjusts the super capacitor through the control signal;
the damping control loop includes: the device comprises a dynamic signal extraction module, a preposed signal processing module, a filtering module, a proportional phase-shifting amplification module and a self-adaptive adjustment module;
the dynamic signal extraction module is used for monitoring the state of the outlet bus of the offshore wind farm in real time and acquiring a dynamic signal of the outlet bus of the offshore wind farm;
the preposed signal processing module is used for carrying out preposed processing on the dynamic signal to obtain a target dynamic signal;
the filtering module is used for filtering the target dynamic signal and extracting a subsynchronous component in the target dynamic signal;
the proportional phase shift amplification module is used for amplifying and compensating the signal phase according to the subsynchronous component to obtain a control signal adaptive to the super capacitor;
the adaptive adjustment module is used for adaptively adjusting parameters of the preposed signal processing module, the filtering module and the proportional phase shifting amplification module.
Further, the damping control circuit further includes: a voltage amplitude limiting module;
the voltage amplitude limiting module is used for carrying out voltage amplitude limiting on the control signal to obtain an amplitude-limited control signal, and the super capacitor control system carries out voltage self-adaptive adjustment on the super capacitor according to the amplitude-limited control signal.
Further, the preamble signal processing module includes: a high-pass filter;
the high-pass filter is used for filtering the low-frequency component of the dynamic signal according to the first cut-off angle frequency parameter to obtain the target dynamic signal.
Further, the filtering module includes: a band-pass filter;
the band-pass filter is used for filtering out non-subsynchronous components of the target dynamic signal according to a second cut-off angle frequency, and extracting and obtaining subsynchronous components in the target dynamic signal.
Further, the proportional phase shift amplification module is specifically configured to amplify and compensate a signal phase according to a preset proportional gain and a phase shift time constant, so as to obtain a control signal adapted to the super capacitor.
Further, the adaptive adjustment module is specifically configured to perform adaptive adjustment on at least one parameter of the first cut-off angle frequency, the second cut-off angle frequency, the proportional gain, and the phase shift time.
The embodiment of the invention also provides a self-adaptively adjusted sub-synchronous oscillation suppression method for offshore wind power, which is used for any self-adaptively adjusted sub-synchronous oscillation suppression system for offshore wind power in the embodiment of the invention, and comprises the following steps:
acquiring a dynamic signal of an outlet bus of an offshore wind plant;
extracting a subsynchronous oscillation mode and a characteristic root according to the dynamic signal;
judging whether subsynchronous oscillation occurs or not according to the synchronous oscillation mode and the characteristic root;
and if subsynchronous oscillation occurs, the supercapacitor is adaptively adjusted through the supercapacitor control system to suppress the subsynchronous oscillation.
Further, if subsynchronous oscillation occurs, the step of adaptively adjusting the supercapacitor through the supercapacitor control system specifically includes:
judging whether the subsynchronous oscillation converges according to the oscillation amplitude of the subsynchronous oscillation;
if the subsynchronous oscillation is not converged, the supercapacitor is adaptively adjusted through the supercapacitor control system to suppress the subsynchronous oscillation;
and if the subsynchronous oscillation is converged, ending subsynchronous oscillation suppression.
Further, if subsynchronous oscillation occurs, the step of adaptively adjusting the super capacitor through the super capacitor control system specifically further includes:
judging whether the subsynchronous oscillation is finished or not;
and if the subsynchronous oscillation is not finished, performing self-adaptive adjustment on the parameters of the damping control loop, and performing self-adaptive adjustment on the super capacitor through a super capacitor control system.
Further, the step of adaptively adjusting the adjustment parameter in the supercapacitor control system specifically includes:
and carrying out self-adaptive adjustment on the parameters of the damping control loop.
In the embodiment of the invention, subsynchronous oscillation is inhibited by the super capacitor attached to an offshore wind farm outlet bus, the super capacitor control system and the damping control loop attached to the super capacitor; the damping control loop is used for outputting a control signal to the super capacitor control system, and the super capacitor control system adjusts the super capacitor through the control signal; the damping control loop includes: the device comprises a dynamic signal extraction module, a preposed signal processing module, a filtering module, a proportional phase-shifting amplification module and a self-adaptive adjustment module; the dynamic signal extraction module is used for monitoring the state of the outlet bus of the offshore wind farm in real time and acquiring a dynamic signal of the outlet bus of the offshore wind farm; the preposed signal processing module is used for carrying out preposed processing on the dynamic signal to obtain a target dynamic signal; the filtering module is used for filtering the target dynamic signal and extracting a subsynchronous component in the target dynamic signal; the proportional phase shift amplification module is used for amplifying and compensating a signal phase according to the subsynchronous component to obtain a control signal adaptive to the super capacitor; the adaptive adjustment module is used for adaptively adjusting parameters of the preposed signal processing module, the filtering module and the proportional phase shifting amplification module. The super capacitor and the super capacitor control system can be added to an outlet bus of the offshore wind farm to inhibit the sub-synchronous oscillation of the offshore wind farm grid-connected system, and dynamic inhibition is performed through self-adaptive adjustment, so that the dynamic characteristic of offshore wind farm grid-connected operation is improved, and the sub-synchronous oscillation which endangers the stable operation of the system is effectively inhibited.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a topological structure diagram of an offshore wind power grid-connected system provided by an embodiment of the invention;
FIG. 2 is a topological structure diagram of an offshore wind power grid-connected system with a super capacitor according to an embodiment of the present invention;
FIG. 3 is a block diagram of a super capacitor according to an embodiment of the present invention;
fig. 4 is a structural diagram of a self-adaptively adjusted offshore wind power subsynchronous oscillation suppression system provided in an embodiment of the present invention;
fig. 5 is a flowchart of a method for suppressing the offshore wind power subsynchronous oscillation with adaptive adjustment according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a topological structure diagram of an offshore wind power grid-connected system according to an embodiment of the present invention, and as shown in fig. 1, the system includes: the system comprises an offshore wind power plant, an offshore wind power plant step-up voltage transformer, a flexible direct current transmission system and an infinite power grid. In the system, an outlet bus of the offshore wind farm can be a 25KV current collection submarine cable, the outlet bus is connected with a boosting transformer of the offshore wind farm, and after the voltage is boosted from 35KV to 220KV through the boosting transformer of the offshore wind farm, the outlet bus is connected with a flexible direct current transmission system and an infinite power grid in a grid mode, namely, the flexible direct current grid mode is called as flexible direct current grid mode.
Referring to fig. 2, fig. 2 is a topological structure diagram of an offshore wind power grid-connected system including a super capacitor according to an embodiment of the present invention, and as shown in fig. 2, on the basis of fig. 1, the super capacitor is further included. The super capacitor is added to the offshore wind power plant outlet bus, so that the damping of a subsynchronous oscillation mode can be increased, and subsynchronous oscillation can be effectively inhibited.
The super capacitor can be controlled and adjusted through the self-adaptive adjustment type offshore wind power subsynchronous oscillation suppression system, and dynamic self-adaptive control adjustment is carried out on the super capacitor, so that the offshore wind power subsynchronous oscillation can be dynamically suppressed.
The self-adaptively adjusted offshore wind power subsynchronous oscillation suppression system comprises: the super capacitor control system and the damping control loop are used for self-adaptive adjustment of the super capacitor.
It should be noted that the subsynchronous oscillation of the offshore wind power through the flexible direct-current power transmission system is an electromagnetic oscillation phenomenon caused by the negative damping characteristic of the whole system due to the interaction between the offshore wind power plant and the flexible direct-current power transmission system, and the equipment safety and the system stability are endangered.
In the embodiment of the invention, the super capacitor is attached to the outlet bus of the offshore wind farm and is not added into the offshore wind power grid-connected system in a series connection mode, so that the network structure of the power system cannot be changed, the complexity of the power system network is not increased, and the instability risk of the system under other working conditions is not increased. It should be noted that the super capacitor is a novel energy storage device between a conventional capacitor and a rechargeable battery, and has the characteristics of rapid charging and discharging of the capacitor and the energy storage characteristics of the battery. The super capacitor stores energy to directly store the electric energy in an electric field, has no energy form conversion, high response speed and high charging and discharging time, and can be used for improving the electric energy quality and improving the dynamic stability of a power grid in the embodiment of the invention.
Specifically, referring to fig. 3, fig. 3 is a structural diagram of a super capacitor according to an embodiment of the present invention, and as shown in fig. 3, the super capacitor includes: super capacitor C SC Equivalent series resistanceR SC Filter inductor L SC And a bidirectional Buck/Boost converter, wherein the super capacitor C SC With equivalent series resistance R SC Electrically connected to the equivalent series resistance R SC And a filter inductor L SC Electrically connected to the filter inductor L SC And is electrically connected with the bidirectional Buck/Boost converter.
In an embodiment of the present invention, the damping control loop is configured to output a control signal to the super capacitor control system, and the super capacitor control system is configured to adjust the super capacitor through the control signal.
Specifically, referring to fig. 4, fig. 4 is a structural diagram of a self-adaptively adjusted offshore wind power subsynchronous oscillation suppression system provided in an embodiment of the present invention, as shown in fig. 4, the self-adaptively adjusted offshore wind power subsynchronous oscillation suppression system includes a super capacitor control system 41 and a damping control loop 42 which are additionally disposed on a super capacitor, where the damping control loop includes a dynamic signal extraction module 421, a pre-signal processing module 422, a filtering module 423, a proportional phase shifting amplification module 424, and a self-adaptively adjusting module 426, and optionally, the damping control loop further includes a voltage limiting module 425. The super capacitor control system comprises an inner loop control module, an outer loop control module and pwm (pulse width modulation). The super capacitor is additionally provided with the damping control loop, the network structure of the power system does not need to be changed or other devices do not need to be additionally arranged, the electric damping of the offshore wind power grid-connected system is improved, and the cost and the loss are reduced while the stability of the offshore wind power grid-connected system is maintained.
Specifically, the dynamic signal extraction module is used for monitoring the state of an outlet bus of an offshore wind farm in real time and acquiring a dynamic signal of the outlet bus of the wind farm; the preposed signal processing module is used for carrying out preposed processing on the dynamic signal to obtain a target dynamic signal; the filtering module is used for filtering the target dynamic signal and extracting a subsynchronous component in the target dynamic signal; the proportional phase shift amplification module is used for amplifying and compensating the signal phase according to the subsynchronous component to obtain a control signal adaptive to the super capacitor; the self-adaptive adjusting module is used for self-adaptively adjusting the parameters of the preposed signal processing module, the filtering module and the proportional phase shifting amplifying module.
In the embodiment of the present invention, the dynamic signal may be an ac three-phase voltage signal of an offshore wind farm outlet bus, and the dynamic signal may also be referred to as an input signal. The voltage state of the outlet bus of the offshore wind farm can be monitored in real time, and the alternating-current three-phase voltage of the outlet bus of the offshore wind farm is used as an input signal of a control system.
Optionally, the preposed signal processing module includes a high-pass filter, and the high-pass filter is configured to filter a low-frequency component of the dynamic signal according to the first cut-off angle frequency parameter, so as to obtain the target dynamic signal. Specifically, the transfer function of the high-pass filter in the embodiment of the present invention is shown by the following equation (1):
wherein G(s) is an output signal (target dynamic signal) of a high-pass filter, s is an input signal of the high-pass filter, and ω is sch The first cut-off angle frequency of the high-pass filter.
Optionally, the filtering module includes a band-pass filter, and the band-pass filter is configured to filter a non-sub-synchronous component of the dynamic signal according to a second cut-off angle frequency, and extract a sub-synchronous component in the target dynamic signal. Specifically, the transfer function of the bandpass filter in the embodiment of the present invention is shown in the following equation (2):
wherein G(s) is an output signal (subsynchronous component) of the band-pass filter, s is an input signal (target dynamic signal) of the band-pass filter, and ω is a frequency sc The second cut-off angle frequency of the band pass filter, and ζ is the damping ratio of the band pass filter.
A high-pass filter and a band-pass filter are used in the damping control loop, so that non-subsynchronous components in dynamic signals can be well filtered, and the anti-interference capability is high.
Optionally, the proportional phase shift amplification module is specifically configured to amplify and compensate a signal phase according to a preset proportional gain and a phase shift time constant, so as to obtain a control signal adapted to the super capacitor. Specifically, the transfer function of the proportional phase shift amplification module in the embodiment of the present invention is shown in the following equation (3):
wherein G(s) is an output signal (control signal) of the proportional phase shift amplification module, s is an input signal (subsynchronous component) of the proportional phase shift amplification module, and K is p For proportional gain, T above sc Is the phase shift time constant.
Optionally, the voltage amplitude limiting module is configured to perform voltage amplitude limiting on the control signal to obtain an amplitude-limited control signal, and the super-capacitor control system performs voltage adaptive adjustment on the super-capacitor according to the amplitude-limited control signal. Specifically, in consideration of the actual working condition of the offshore wind power grid-connected system, the amplitude of the output control signal cannot be too large, and the control signal after the amplitude limiting link is used as the given value added value of the voltage control loop of the super capacitor.
Optionally, the adaptive adjustment module is specifically configured to perform adaptive adjustment on at least one parameter of the first cut-off angle frequency, the second cut-off angle frequency, the proportional gain, and the phase shift time, so as to adjust an output signal of the damping control loop. In order to ensure the suppression effect of subsynchronous oscillation, parameters in the preposed signal processing module, the filtering module and the proportional phase-shifting module need to ensure that proper positive damping can be provided under different working conditions of the system, namely, the adaptive performance is strong. The parameter of the preposition information processing module can be the first cut-off angular frequency omega of the high-pass filter sch The parameter of the filtering module may be a second cut-off corner frequency of the band-pass filterRate omega sc The parameter of the proportional phase shift module may be a proportional gain K p And a phase shift time constant T sc Therefore, the first cut-off angular frequency ω of the high-pass filter is required sch Second cut-off angular frequency omega of the band-pass filter sc Damping ratio zeta and proportional gain K of band-pass filter p And a phase shift time constant T sc And performing self-adaptive optimization design. The adaptive adjustment module may be performed by an adaptive control law of the following equation (4):
wherein, in the objective function part, the above u pwm And u m An output voltage and an input signal voltage of pwm, respectively; sigma m The characteristic root real part under the mth subsynchronous oscillation mode; it can be seen that pwm is used as the output voltage u in the embodiment of the present invention pwm And an input signal voltage u m The minimum is the objective function. In the constraint part, the above ω sch.min And ω sch.max A lower limit and an upper limit of a first cut-off angle frequency of the high-pass filter, respectively; omega mentioned above sc.min And ω sc.max Lower and upper limits, respectively, of a second cut-off angular frequency of the band-pass filter; zeta of the above min And ζ max The lower limit and the upper limit of the damping ratio of the band-pass filter are respectively; k above p.min And K p.max Lower and upper limits for proportional gain; t is min And T max Respectively, the lower limit and the upper limit of the phase shift time constant. The damping control loop has good adaptability by matching with dynamic signal processing, parameters of the damping control loop can be accurately and reasonably set and adjusted according to actual working conditions, and sub-synchronous oscillation of the offshore wind power grid-connected system can be effectively and quickly inhibited.
Judging according to the characteristic roots under different working conditions of the offshore wind power grid-connected system, wherein when the real part sigma of the characteristic root is a positive value, the offshore wind power grid-connected system is unstable; when the real part sigma of the characteristic root is a negative value, the offshore wind power grid-connected system is stable. When the real part σ of the feature root is a negative value, the smaller the value thereof, the stronger the stability of the system. Meanwhile, the amplitude of the input signal voltage and the output voltage is adjusted, so that subsynchronous oscillation is converged continuously. Through the parameter self-adaptive adjusting module, the parameters of the control loop are changed in a self-adaptive mode under different subsynchronous oscillations, and the direct-current voltage of the super capacitor is dynamically changed, so that the power of the super capacitor is changed along with the power fluctuation of the offshore wind power grid-connected system, and the subsynchronous oscillations of the offshore wind power grid-connected system are restrained.
In the embodiment of the invention, the subsynchronous oscillation is suppressed by the super capacitor and the super capacitor control system which are additionally arranged on the outlet bus of the offshore wind farm; the super capacitor control system is used for outputting a control signal to perform self-adaptive adjustment on the super capacitor; the super capacitor control system comprises: the device comprises a dynamic signal extraction module, a preposed signal processing module, a filtering module, a proportional phase-shifting amplification module and a self-adaptive adjustment module; the dynamic signal extraction module is used for monitoring the state of an outlet bus of the offshore wind power plant in real time and acquiring a dynamic signal of the outlet bus of the wind power plant; the preposed signal processing module is used for carrying out preposed processing on the dynamic signal to obtain a target dynamic signal; the filtering module is used for filtering the target dynamic signal and extracting a sub-synchronous component in the target dynamic signal; the proportional phase shift amplification module is used for amplifying and compensating a signal phase according to the subsynchronous component to obtain a control signal adaptive to the super capacitor; the adaptive adjusting module is used for adaptively adjusting the parameters of the preposed signal processing module, the filtering module and the proportional phase-shifting amplifying module. The super capacitor and the super capacitor control system can be added to an outlet bus of the offshore wind farm to inhibit the sub-synchronous oscillation of the offshore wind farm grid-connected system, and dynamic inhibition is performed through self-adaptive adjustment, so that the dynamic characteristic of offshore wind farm grid-connected operation is improved, and the sub-synchronous oscillation which endangers the stable operation of the system is effectively inhibited.
The embodiment of the invention also provides a self-adaptive adjustment method for suppressing the sub-synchronous oscillation of the offshore wind power.
Specifically, please refer to fig. 5, fig. 5 is a flowchart of a method for suppressing the offshore wind power subsynchronous oscillation with adaptive adjustment according to an embodiment of the present invention, and as shown in fig. 5, the method includes the following steps:
s1, obtaining a dynamic signal of an offshore wind plant outlet bus.
In the embodiment of the invention, the state of the outlet bus of the offshore wind farm can be monitored in real time through the dynamic signal extraction module in the damping control loop, and the dynamic signal of the outlet bus of the wind farm is obtained. Specifically, the AC three-phase power tower of the offshore wind plant outlet bus can be monitored in real time, a voltage curve is fitted, and damping control loop parameters are initialized.
And S2, extracting a subsynchronous oscillation mode and a characteristic root according to the dynamic signal.
In the embodiment of the present invention, the subsynchronous oscillation mode and the characteristic root may be obtained by the equations (1) to (5). The subsynchronous oscillation mode may be determined based on the subsynchronous component.
And S3, judging whether subsynchronous oscillation occurs or not according to the synchronous oscillation mode and the characteristic root.
If subsynchronous oscillation does not occur, the synchronous oscillation suppression process is ended. If subsynchronous oscillation occurs, step S4 is performed.
And S4, if subsynchronous oscillation occurs, the subsynchronous oscillation is suppressed by adaptively adjusting the super capacitor through the super capacitor control system.
In the embodiment of the present invention, whether subsynchronous oscillation converges or not may be determined according to the oscillation amplitude of the subsynchronous oscillation; if the subsynchronous oscillation is not converged, the supercapacitor is adaptively adjusted through the supercapacitor control system to suppress the subsynchronous oscillation; if the subsynchronous oscillation converges, the subsynchronous oscillation suppression is finished.
Further, judging whether the subsynchronous oscillation is finished; if the subsynchronous oscillation is not finished, the parameters of the damping control loop are adaptively adjusted, the super capacitor is adaptively adjusted through the super capacitor control system, and specifically, the control signals output by the super capacitor control system are adaptively adjusted through the parameters of the damping control loop, so that the super capacitor is adaptively adjusted.
In the embodiment of the invention, aiming at the problem of subsynchronous oscillation of the offshore wind power grid-connected system, the method and the system for inhibiting the subsynchronous oscillation of the offshore wind power grid-connected system by the super capacitor are designed, and a foundation is laid for further researching the dynamic characteristics of the super capacitor to the offshore wind power grid-connected system. Meanwhile, the sub-synchronous oscillation of the offshore wind power grid-connected system can be effectively inhibited, the off-grid of a large number of units is reduced, the units are protected from being damaged, the risk of exciting the torsional oscillation of a shafting close to the turbonator is reduced, and the safe and stable operation of the offshore wind power grid-connected system is guaranteed. Compared with the existing additional control strategy parameters with poor applicability to the dynamic operation working conditions of the system, the additional damping control loop parameters on the super capacitor are set quickly, and the method has good applicability under various operation working conditions and strong engineering practical applicability.
Furthermore, the offshore wind power subsynchronous oscillation suppression device capable of adaptive adjustment provided by the embodiment of the invention can be applied to electronic equipment such as computers, servers and the like for performing offshore wind power subsynchronous oscillation suppression of adaptive adjustment. The self-adaptively adjusted offshore wind power subsynchronous oscillation suppression device provided by the embodiment of the invention can realize each process realized by the self-adaptively adjusted offshore wind power subsynchronous oscillation suppression method in the method embodiment, and can achieve the same beneficial effect. To avoid repetition, further description is omitted here.
It should be understood by those skilled in the art that the electronic device is a device capable of automatically performing numerical calculation and/or information processing according to a preset or stored instruction, and the hardware thereof includes, but is not limited to, a microprocessor, an Application Specific Integrated Circuit (ASIC), a Programmable gate array (FPGA), a Digital Signal Processor (DSP), an embedded device, and the like. For example: the electronic equipment is applied to a computer, a server and other equipment for suppressing the sub-synchronous oscillation of the offshore wind power, which can be adjusted in a self-adaptive manner. The electronic device provided by the embodiment of the invention can realize each process realized by the self-adaptively adjusted offshore wind power subsynchronous oscillation suppression method in the method embodiment, can achieve the same beneficial effect, and is not repeated herein for avoiding repetition.
The memory includes at least one type of readable storage medium including a flash memory, a hard disk, a multimedia card, a card type memory (e.g., SD or DX memory, etc.), a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a Read Only Memory (ROM), an Electrically Erasable Programmable Read Only Memory (EEPROM), a Programmable Read Only Memory (PROM), a magnetic memory, a magnetic disk, an optical disk, etc. In some embodiments, the memory may be an internal storage unit of the electronic device, such as a hard disk or a memory of the electronic device. In other embodiments, the memory may also be an external storage device of the electronic device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a flash memory Card (FlashCard), and the like provided on the electronic device. Of course, the memory may also include both internal and external memory units of the electronic device. In this embodiment, the memory is generally used to store an operating system installed in the electronic device and various types of application software, for example, a program code of an adaptive adjustment method for suppressing the sub-synchronous oscillation of the offshore wind power plant, and the like. In addition, the memory may also be used to temporarily store various types of data that have been output or are to be output.
The processor may be a Central Processing Unit (CPU), controller, microcontroller, microprocessor, or other data Processing chip in some embodiments. The processor is typically used to control the overall operation of the electronic device. In this embodiment, the processor is configured to run a program code stored in the memory or process data, for example, a program code for running a self-adaptive offshore wind power subsynchronous oscillation suppression method.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by a computer program, which may be stored in a computer readable storage medium and executed by a computer to implement the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (6)
1. The self-adaptive adjustment type offshore wind power subsynchronous oscillation suppression system is characterized by being used for controlling and adjusting a super capacitor attached to an outlet bus of an offshore wind farm, and comprises: the damping control loop and the super capacitor control system are added on the super capacitor;
the damping control loop is used for outputting a control signal to the super capacitor control system, and the super capacitor control system adjusts the super capacitor through the control signal;
the super-capacitor control system comprises an inner ring control module, an outer ring control module and pwm;
the damping control loop includes: the device comprises a dynamic signal extraction module, a preposed signal processing module, a filtering module, a proportional phase-shifting amplification module and a self-adaptive adjustment module;
the dynamic signal extraction module is used for monitoring the state of the outlet bus of the offshore wind farm in real time and acquiring a dynamic signal of the outlet bus of the offshore wind farm;
the preposed signal processing module is used for carrying out preposed processing on the dynamic signal to obtain a target dynamic signal; the preposed signal processing module comprises a high-pass filter, and the high-pass filter is used for filtering the low-frequency component of the dynamic signal according to a first cut-off angle frequency parameter to obtain the target dynamic signal;
the filtering module is used for filtering the target dynamic signal and extracting a sub-synchronous component in the target dynamic signal; the filtering module comprises a band-pass filter, and the band-pass filter is used for filtering non-subsynchronous components of the target dynamic signal according to a second cut-off angle frequency and extracting to obtain subsynchronous components in the target dynamic signal;
the proportional phase-shifting amplification module is specifically used for amplifying and compensating the signal phase according to a preset proportional gain and a phase-shifting time constant to obtain a control signal adaptive to the super capacitor;
the adaptive adjustment module is specifically configured to perform adaptive adjustment on at least one parameter of the first cut-off angle frequency, the second cut-off angle frequency, the proportional gain, and the phase shift time;
the self-adaptive adjusting module is adjusted through a self-adaptive control law of the following formula:
wherein u is pwm And u m An output voltage and an input signal voltage of pwm, respectively; sigma m Is a characteristic root real part under the mth subsynchronous oscillation mode; omega sch.min And ω sch.max A lower limit and an upper limit of a first cut-off angle frequency of the high-pass filter, respectively; omega sc.min And ω sc.max A lower limit and an upper limit of a second cut-off angular frequency of the band-pass filter, respectively; ζ represents a unit min And ζ max The lower limit and the upper limit of the damping ratio of the band-pass filter are respectively; k p.min And K p.max Lower and upper limits for proportional gain; t is min And T max Respectively, the lower limit and the upper limit of the phase shift time constant.
2. The adaptively adjusted offshore wind power subsynchronous oscillation suppression system of claim 1, wherein said damping control loop further comprises: a voltage amplitude limiting module;
the voltage amplitude limiting module is used for carrying out voltage amplitude limiting on the control signal to obtain an amplitude-limited control signal, and the super capacitor control system carries out voltage self-adaptive adjustment on the super capacitor according to the amplitude-limited control signal.
3. An adaptively adjusted offshore wind power subsynchronous oscillation suppression method, characterized in that the method is used for the adaptively adjusted offshore wind power subsynchronous oscillation suppression system of any one of claims 1 to 2, and the method comprises the following steps:
acquiring a dynamic signal of an outlet bus of an offshore wind plant;
extracting a subsynchronous oscillation mode and a characteristic root according to the dynamic signal;
judging whether subsynchronous oscillation occurs or not according to the synchronous oscillation mode and the characteristic root;
and if subsynchronous oscillation occurs, the supercapacitor is adaptively adjusted through the supercapacitor control system to suppress the subsynchronous oscillation.
4. The adaptively adjusted offshore wind power subsynchronous oscillation suppression method according to claim 3, wherein the step of adaptively adjusting the supercapacitor through the supercapacitor control system if subsynchronous oscillation occurs specifically comprises:
judging whether the subsynchronous oscillation converges according to the oscillation amplitude of the subsynchronous oscillation;
if the subsynchronous oscillation is not converged, the subsynchronous oscillation is suppressed by adaptively adjusting the super capacitor through the super capacitor control system;
and if the subsynchronous oscillation is converged, ending subsynchronous oscillation suppression.
5. The adaptively adjusted offshore wind power subsynchronous oscillation suppression method according to claim 4, wherein the step of adaptively adjusting the supercapacitor through the supercapacitor control system if subsynchronous oscillation occurs further comprises:
judging whether the subsynchronous oscillation is finished or not;
and if the subsynchronous oscillation is not finished, performing self-adaptive adjustment on parameters of the damping control loop, and performing self-adaptive adjustment on the super capacitor through the super capacitor control system.
6. The self-adaptively adjusted offshore wind power subsynchronous oscillation suppression method according to claim 5, wherein the step of performing self-adaptive adjustment on the adjustment parameter in the supercapacitor control system specifically comprises:
and performing self-adaptive adjustment on the parameters of the damping control loop according to the feedback information of the super-capacitor control system and the subsynchronous oscillation mode.
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Effective date of registration: 20240207 Address after: Room 1006A, 958 Lujiazui Ring Road, China (Shanghai) Pilot Free Trade Zone, Pudong New Area, Shanghai, 200120 Patentee after: Shanghai Shenergy New Energy Investment Co.,Ltd. Country or region after: China Address before: 410006 No.1, Lushan South Road, Changsha City, Hunan Province Patentee before: HUNAN University Country or region before: China |