CN113241776A - Reactive power control method, device, terminal and medium for conventional direct current transmission system - Google Patents
Reactive power control method, device, terminal and medium for conventional direct current transmission system 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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- H02J3/50—Controlling the sharing of the out-of-phase component
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
- H02J2003/365—Reducing harmonics or oscillations in HVDC
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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
- Y02E10/76—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
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The application discloses a reactive power control method, a device, a terminal and a medium of a conventional direct current transmission system, which utilize the characteristics of decoupling control of active power and reactive power of a direct-drive fan without adding extra reactive power compensation equipment, calculate the reactive power to be compensated by analyzing the harmonic component of a current conversion bus at the inversion side of the conventional direct current conversion and send the reactive power to a fast reactive power control system of a wind farm, further distribute reactive power regulating quantity according to the adjustable reactive power capacity of each fan and send the regulating quantity to the corresponding fan, add the reactive power regulating quantity in the reactive power control link of the direct-drive fan, further inhibit the harmonic component of the voltage of the conventional direct current conversion bus, enhance the reliability and the stability of the operation of the conventional direct current transmission system, solve the problem that the dynamic reactive power compensation of the conventional direct current transmission system depends on the mode of additionally installing a static synchronous compensator, leading to the technical problem of the construction cost rise of the conventional direct current transmission system.
Description
Technical Field
The application relates to the technical field of wind power generation, in particular to a reactive power control method, device, terminal and medium for a conventional direct current transmission system.
Background
In recent years, the number of wind power plants adopting direct-drive wind power generators incorporated into a power grid is increasing, some of the wind power plants are built near a conventional direct-current receiving end, and therefore, the reactive power stability of a conventional direct-current system and the wind power plants must be guaranteed. At present, a static synchronous compensator (STATCOM) is additionally arranged in a method for carrying out dynamic reactive compensation on conventional direct-current transmission, the STATCOM is a parallel reactive compensation FACTS device which can emit or absorb reactive power, the output of the STATCOM can be changed to control specific parameters in a power system, and the STATCOM has the advantages of continuous adjustment, small harmonic wave, low loss, wide operation range, high reliability, high adjustment speed and the like, but also has high construction cost and needs to additionally increase construction land.
Disclosure of Invention
The application provides a reactive power control method, a device, a terminal and a medium for a conventional direct current transmission system, which are used for solving the technical problem that the construction cost of the conventional direct current transmission system is increased due to the fact that the dynamic reactive power compensation of the conventional direct current transmission system depends on a mode of additionally installing a static synchronous compensator.
The application provides a reactive power control method for a conventional direct current transmission system in a first aspect, and the method comprises the following steps:
collecting three-phase voltage values at an inversion side converter bus of a conventional direct current transmission system, carrying out Fourier decomposition on the three-phase voltage values to obtain higher harmonic components, and carrying out time domain integration processing on the higher harmonic components to obtain harmonic voltage components;
calculating reactive power compensation quantity according to the harmonic voltage component;
acquiring the adjustable reactive power capacity of a wind turbine set in a wind power plant, wherein the wind turbine set is a direct-drive wind turbine set;
distributing the reactive power compensation quantity according to the adjustable reactive power capacity to obtain the reactive power adjustment quantity of each wind turbine set;
and sending the reactive power adjustment quantity to the wind turbine generator set so that the wind turbine generator set performs reactive power output control according to the reactive power adjustment quantity.
Preferably, the distributing the reactive power compensation amount according to the adjustable reactive power capacity to obtain the reactive power adjustment amount of each wind turbine generator set specifically includes:
and according to the size of each adjustable reactive power capacity, carrying out equal proportion distribution on the reactive power compensation quantity to obtain the reactive power adjustment quantity corresponding to each wind turbine set.
Preferably, the mode of controlling the reactive power output by the wind turbine generator specifically includes:
and the wind turbine set performs PI operation on the received reactive power adjustment quantity to obtain a first current reference value, calculates a voltage modulation wave signal according to the first current reference value, and transmits the voltage modulation wave signal to an inverter corresponding to the wind turbine set, so that the inverter triggers corresponding switching action according to the voltage modulation wave signal.
A second aspect of the present application provides a reactive power control device for a conventional dc power transmission system, including:
the harmonic voltage component acquisition unit is used for acquiring a three-phase voltage value at an inversion side converter bus of a conventional direct current transmission system, performing Fourier decomposition on the three-phase voltage value to obtain a higher harmonic component, and performing time domain integration processing on the higher harmonic component to obtain a harmonic voltage component;
the reactive power compensation amount calculating unit is used for calculating reactive power compensation amount according to the harmonic voltage component;
the system comprises an adjustable reactive power capacity obtaining unit, a control unit and a control unit, wherein the adjustable reactive power capacity obtaining unit is used for obtaining the adjustable reactive power capacity of a wind turbine set in a wind power plant, and the wind turbine set is a direct-drive wind turbine set;
the reactive power adjustment quantity distribution unit is used for distributing the reactive power compensation quantity according to the adjustable reactive power capacity to obtain the reactive power adjustment quantity of each wind turbine set;
and the reactive power control unit is used for sending the reactive power adjustment quantity to the wind turbine set so that the wind turbine set performs reactive power output control according to the reactive power adjustment quantity.
Preferably, the reactive power adjustment amount distribution unit is specifically configured to:
and according to the size of each adjustable reactive power capacity, carrying out equal proportion distribution on the reactive power compensation quantity to obtain the reactive power adjustment quantity corresponding to each wind turbine set.
Preferably, the mode of controlling the reactive power output by the wind turbine generator specifically includes:
and the wind turbine set performs PI operation on the received reactive power adjustment quantity to obtain a first current reference value, calculates a voltage modulation wave signal according to the first current reference value, and transmits the voltage modulation wave signal to an inverter corresponding to the wind turbine set, so that the inverter triggers corresponding switching action according to the voltage modulation wave signal.
The third aspect of the present application provides a reactive power control terminal of a conventional direct current transmission system, including: a memory and a processor;
the memory is configured to store program code corresponding to a conventional dc power transmission system reactive power control method as provided in the first aspect of the present application;
the processor is configured to execute the program code.
A fourth aspect of the present application provides a computer-readable storage medium having stored therein program code corresponding to the conventional dc power transmission system reactive power control method as provided in the first aspect of the present application.
According to the technical scheme, the embodiment of the application has the following advantages:
the method utilizes the characteristics of active power and reactive power decoupling control of the direct-drive type fan, no extra reactive power compensation equipment is needed to be added, the harmonic component of a conventional direct-current conversion side conversion bus is analyzed, the reactive power required to be compensated is calculated and sent to a wind power plant fast reactive power control system, the reactive power regulating quantity is further distributed according to the adjustable reactive power capacity of each fan and sent to the corresponding fan, the reactive power regulating quantity is added in the reactive power control link of the direct-drive type fan, the harmonic component of the voltage of the conventional direct-current conversion bus is further inhibited, the reliability and stability of the operation of the conventional direct-current transmission system are enhanced, and the technical problem that the construction cost of the conventional direct-current transmission system is increased due to the fact that the dynamic reactive power compensation of the conventional direct-current transmission system depends on the mode of additionally installing a static synchronous compensator is solved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a structural diagram of a conventional parallel hybrid dc power transmission system.
Fig. 2 is a schematic flow chart of an embodiment of a reactive power control method of a conventional direct current transmission system provided in the present application.
Fig. 3 is a logic block diagram of reactive power control performed on a conventional dc power transmission system according to the present application.
Fig. 4 is a schematic structural diagram of an embodiment of a reactive power modulation device of an ac system of a wind farm.
Detailed Description
The conventional direct-current transmission based on the current source type converter has the characteristics of long transmission distance, large transmission capacity, quick and controllable transmission power and the like. However, the conventional high-voltage direct-current transmission system adopts a thyristor which is a semi-controlled device, so that the risk of phase commutation failure occurs in the operation process. Various harmonic waves in an alternating current system can cause the voltage of a current conversion bus to be distorted, the voltage is determined by direct current in the conventional direct current phase conversion process, the harmonic waves cause voltage deformity, the phase conversion time is prolonged, the arc extinguishing angle is reduced, and if the arc extinguishing angle is smaller than 7 degrees, the phase conversion failure can occur.
In recent years, wind farms using direct-drive wind generators are increasingly incorporated into a power grid, some of the wind farms are built near a conventional direct-current receiving end, and therefore it is necessary to ensure stable reactive power of a conventional direct-current system and the wind farms.
The current method of dynamic reactive compensation for conventional dc is mostly to add a static synchronous compensator (STATCOM), which is a parallel reactive compensation FACTS device that can emit or absorb reactive power and whose output can be varied to control specific parameters in the power system. The STATCOM has the advantages of continuous adjustment, small harmonic wave, low loss, wide operation range, high reliability, high adjustment speed and the like, but the STATCOM is high in construction cost and needs to additionally increase construction land.
In view of this, the embodiment of the present application provides a reactive power control method, device, terminal and medium for a conventional direct current power transmission system, which are used to solve the technical problem that the construction cost of an alternating current system of a wind farm is increased due to the fact that a static synchronous compensator is additionally installed in the dynamic reactive power compensation of the conventional direct current power transmission system.
In order to make the objects, features and advantages of the present invention more apparent and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the embodiments described below are only a part of the embodiments of the present application, 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 application.
When the direct-drive wind generating set operates, the fan is not connected with the speed-increasing gear box and is directly coupled with the generator; the stator of the generator is a three-phase winding or a multi-phase winding, and the rotor is a permanent magnet or electric excitation structure; the stator generates non-power frequency electric energy, and the voltage also changes along with the rotating speed; the system is provided with a rectification inversion device, and alternating current with changed voltage and frequency generated by a generator is rectified and inverted to be changed into constant-voltage constant-frequency electric energy which is input into a power grid; the active power and the reactive power of the direct-drive wind driven generator are completely decoupled, the active power and the reactive power output by the system can be changed by adjusting the control signal of the inverter, and the power requirement of a power grid is met in real time.
The applicant finds that the active power and the reactive power of the direct-drive wind driven generator are completely decoupled, and the active power and the reactive power output by the wind power plant can be changed by adjusting the control signal of the inverter. The direct-drive wind power plant can provide dynamic reactive power support through detecting the harmonic voltage of the direct current receiving end commutation bus, and therefore the probability of commutation failure of conventional direct current can be reduced.
Referring to fig. 1, a first embodiment of the present application provides a reactive power control method for a conventional dc power transmission system, including:
It should be noted that, according to the method provided by the present application, first, three-phase voltage values at a grid-connected point of a wind farm and an ac bus are collected, fourier decomposition is performed to obtain higher (2-nth) harmonic components, and the harmonic voltage component U can be calculated by integrating the higher harmonic voltage over timex。
And 102, calculating reactive power compensation quantity according to the harmonic voltage component.
Then, immediately after step 101, the harmonic voltage component U obtained by step 101xCombining with the calculation formula of the reactive power, the reactive power is obtained through the calculation of the calculation formula of the reactive power, and the reactive power is the reactive power compensation quantity Q mentioned in the applicationtotalAnd represents the total reactive power amount required to be compensated by the wind power plant.
And 103, acquiring the adjustable reactive power capacity of a wind turbine in the wind power plant, wherein the wind turbine is a direct-drive wind turbine.
And 104, distributing the reactive power compensation quantity according to the adjustable reactive power capacity to obtain the reactive power adjustment quantity of each wind turbine set.
Then, following step 102, step 103 and step 104 distribute reactive power adjustment quantities (Q) according to the adjustable reactive power capacities of the wind energy groups in the wind farm by obtaining the adjustable reactive power capacities of the wind energy groups based on step 102, obtained in step 1021、Q2、Qi…Qn) Wherein Q is1+Q2+Qi+…+Qn＝Qtotal；
And 105, sending the reactive power adjustment quantity to the wind turbine generator set so that the wind turbine generator set performs reactive power output control according to the reactive power adjustment quantity.
And finally, sending the reactive power adjustment quantity to a corresponding wind turbine set, so that the wind turbine set receiving the reactive power adjustment quantity performs reactive power output control according to the reactive power adjustment quantity, and the reactive power output control of the direct-drive wind power plant is realized.
The method provided by the embodiment of the application aims at a direct-drive wind power plant built near a conventional direct current receiving end converter station, utilizes the characteristic of decoupling control of active power and reactive power of a direct-drive fan, does not need to increase hardware equipment, saves the construction land, calculates the reactive power to be compensated according to the harmonic voltage of the conventional direct current conversion bus, enables the direct-drive wind power plant to increase corresponding reactive power output, can inhibit the harmonic voltage of the conventional direct current conversion bus, and enhances the reliability and stability of the operation of a conventional direct current transmission system.
The above is a detailed description of an embodiment of a reactive power control method of a conventional dc power transmission system provided by the present application, and the following is a detailed description of a second embodiment of the reactive power control method of the conventional dc power transmission system provided by the present application.
A method for controlling reactive power of a conventional dc power transmission system according to a second embodiment of the present application is based on the first embodiment, and further includes:
further, the step 104 specifically includes:
and according to the size of each adjustable reactive power capacity, carrying out equal proportion distribution on the reactive power compensation quantity to obtain the reactive power adjustment quantity corresponding to each wind turbine set.
Further, the mode of controlling reactive power output by the wind turbine generator specifically includes:
the wind turbine set performs PI operation on the received reactive power adjustment quantity to obtain a first current reference value, a voltage modulation wave signal is calculated according to the first current reference value, and the voltage modulation wave signal is transmitted to an inverter corresponding to the wind turbine set, so that the inverter triggers corresponding switching action according to the voltage modulation wave signal.
As shown in FIG. 3, Q is adjusted according to the adjustable reactive power capacity of each fantotalThe equal proportion distribution is carried out to obtain the reactive power regulating quantity (Q) of each fan1、Q2、Qi…Qn) And sent to the corresponding fan. QiD-axis current reference value i is obtained through PI link calculationsdrefI.e. the first current reference value mentioned above; the output of the inner loop current controller obtains a reference value u of dq axis voltagesdrefAnd usqrefAnd with nominal active power Pgen_refConverted q-axis current reference value isqrefAfter dq transformation, U is obtainedsabcrefVoltage modulation wave signals are transmitted to the inverter to trigger the inverter to perform switching action, the whole control loop is completed, and the actual reactive power output of each fan is controlled at a given value QiThe reactive power output of the whole wind power plant is controlled to be Qtotal。
The above is a detailed description of the second embodiment of the reactive power control method of the conventional direct current transmission system provided by the present application, and the following is a detailed description of an embodiment of a reactive power control device of the conventional direct current transmission system, an embodiment of a reactive power control terminal of the conventional direct current transmission system, and a computer readable storage medium.
A second aspect of the present application provides a reactive power control device for a conventional dc power transmission system, including:
a harmonic voltage component obtaining unit 201, configured to collect three-phase voltage values at an inverter-side converter bus of a conventional dc power transmission system, perform fourier decomposition on the three-phase voltage values to obtain a higher harmonic component, and perform time domain integration processing on the higher harmonic component to obtain a harmonic voltage component;
a reactive power compensation amount calculation unit 202 for calculating a reactive power compensation amount according to the harmonic voltage component;
an adjustable reactive power capacity obtaining unit 203, configured to obtain an adjustable reactive power capacity of a wind turbine in a wind farm, where the wind turbine is specifically a direct-drive wind turbine;
the reactive power adjustment quantity distribution unit 204 is used for distributing the reactive power compensation quantity according to the adjustable reactive power capacity to obtain the reactive power adjustment quantity of each wind turbine set;
and the reactive power control unit 205 is configured to send the reactive power adjustment amount to the wind turbine generator set, so that the wind turbine generator set performs reactive power output control according to the reactive power adjustment amount.
Further, the reactive power adjustment amount distribution unit 204 is specifically configured to:
and according to the size of each adjustable reactive power capacity, carrying out equal proportion distribution on the reactive power compensation quantity to obtain the reactive power adjustment quantity corresponding to each wind turbine set.
Further, the mode of controlling reactive power output by the wind turbine generator specifically includes:
the wind turbine set performs PI operation on the received reactive power adjustment quantity to obtain a first current reference value, a voltage modulation wave signal is calculated according to the first current reference value, and the voltage modulation wave signal is transmitted to an inverter corresponding to the wind turbine set, so that the inverter triggers corresponding switching action according to the voltage modulation wave signal.
A fourth embodiment of the present application provides a reactive power control terminal for a conventional dc power transmission system, including: a memory and a processor;
the memory is used for storing program codes, and the program codes correspond to the conventional reactive power control method of the direct current transmission system provided by the first embodiment or the second embodiment of the application;
the processor is used for executing the program codes to realize the conventional reactive power control method of the direct current transmission system provided by the first embodiment or the second embodiment of the application.
A fifth embodiment of the present application provides a computer-readable storage medium, in which program codes corresponding to the conventional dc power transmission system reactive power control method provided in the first embodiment or the second embodiment of the present application are stored.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The terms "first," "second," "third," "fourth," and the like in the description of the application and the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (8)
1. A reactive power control method for a conventional direct current transmission system is characterized by comprising the following steps:
collecting three-phase voltage values at an inversion side converter bus of a conventional direct current transmission system, carrying out Fourier decomposition on the three-phase voltage values to obtain higher harmonic components, and carrying out time domain integration processing on the higher harmonic components to obtain harmonic voltage components;
calculating reactive power compensation quantity according to the harmonic voltage component;
acquiring the adjustable reactive power capacity of a wind turbine set in a wind power plant, wherein the wind turbine set is a direct-drive wind turbine set;
distributing the reactive power compensation quantity according to the adjustable reactive power capacity to obtain the reactive power adjustment quantity of each wind turbine set;
and sending the reactive power adjustment quantity to the wind turbine generator set so that the wind turbine generator set performs reactive power output control according to the reactive power adjustment quantity.
2. The reactive power control method of claim 1, wherein the distributing the reactive power compensation amount according to the adjustable reactive power capacity to obtain the reactive power adjustment amount of each wind turbine generator set specifically comprises:
and according to the size of each adjustable reactive power capacity, carrying out equal proportion distribution on the reactive power compensation quantity to obtain the reactive power adjustment quantity corresponding to each wind turbine set.
3. The reactive power control method of the conventional direct current transmission system according to claim 1, wherein the manner of controlling the reactive power output by the wind turbine generator set specifically comprises:
and the wind turbine set performs PI operation on the received reactive power adjustment quantity to obtain a first current reference value, calculates a voltage modulation wave signal according to the first current reference value, and transmits the voltage modulation wave signal to an inverter corresponding to the wind turbine set, so that the inverter triggers corresponding switching action according to the voltage modulation wave signal.
4. A conventional dc transmission system reactive power control apparatus, comprising:
the harmonic voltage component acquisition unit is used for acquiring a three-phase voltage value at an inversion side converter bus of a conventional direct current transmission system, performing Fourier decomposition on the three-phase voltage value to obtain a higher harmonic component, and performing time domain integration processing on the higher harmonic component to obtain a harmonic voltage component;
the reactive power compensation amount calculating unit is used for calculating reactive power compensation amount according to the harmonic voltage component;
the system comprises an adjustable reactive power capacity obtaining unit, a control unit and a control unit, wherein the adjustable reactive power capacity obtaining unit is used for obtaining the adjustable reactive power capacity of a wind turbine set in a wind power plant, and the wind turbine set is a direct-drive wind turbine set;
the reactive power adjustment quantity distribution unit is used for distributing the reactive power compensation quantity according to the adjustable reactive power capacity to obtain the reactive power adjustment quantity of each wind turbine set;
and the reactive power control unit is used for sending the reactive power adjustment quantity to the wind turbine set so that the wind turbine set performs reactive power output control according to the reactive power adjustment quantity.
5. The reactive power control device of claim 4, wherein the reactive power adjustment amount distribution unit is specifically configured to:
and according to the size of each adjustable reactive power capacity, carrying out equal proportion distribution on the reactive power compensation quantity to obtain the reactive power adjustment quantity corresponding to each wind turbine set.
6. The reactive power control device of claim 4, wherein the wind turbine generator system controls the reactive power output in a manner that includes:
and the wind turbine set performs PI operation on the received reactive power adjustment quantity to obtain a first current reference value, calculates a voltage modulation wave signal according to the first current reference value, and transmits the voltage modulation wave signal to an inverter corresponding to the wind turbine set, so that the inverter triggers corresponding switching action according to the voltage modulation wave signal.
7. A conventional dc transmission system reactive control terminal, comprising: a memory and a processor;
the memory is used for storing program codes corresponding to the conventional DC power transmission system reactive power control method according to any one of claims 1 to 3;
the processor is configured to execute the program code.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium stores therein program code corresponding to the conventional dc power transmission system reactive power control method according to any one of claims 1 to 3.
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| CN102354992A (en) * | 2011-09-30 | 2012-02-15 | 北京四方继保自动化股份有限公司 | Reactive-power control method of wind power field |
| CN108462203A (en) * | 2018-03-09 | 2018-08-28 | 清华大学 | A kind of cooperative control method of marine wind electric field access conventional high-pressure straight-flow system |
| CN108711877A (en) * | 2018-06-14 | 2018-10-26 | 南方电网科学研究院有限责任公司 | Inhibit mixed DC system in parallel that the method and device of continuous commutation failure occurs |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354992A (en) * | 2011-09-30 | 2012-02-15 | 北京四方继保自动化股份有限公司 | Reactive-power control method of wind power field |
| CN108462203A (en) * | 2018-03-09 | 2018-08-28 | 清华大学 | A kind of cooperative control method of marine wind electric field access conventional high-pressure straight-flow system |
| CN108711877A (en) * | 2018-06-14 | 2018-10-26 | 南方电网科学研究院有限责任公司 | Inhibit mixed DC system in parallel that the method and device of continuous commutation failure occurs |
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