CN113937828A - Method and system for controlling uncontrolled rectifier of diode and storage medium - Google Patents

Method and system for controlling uncontrolled rectifier of diode and storage medium Download PDF

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Publication number
CN113937828A
CN113937828A CN202111273200.0A CN202111273200A CN113937828A CN 113937828 A CN113937828 A CN 113937828A CN 202111273200 A CN202111273200 A CN 202111273200A CN 113937828 A CN113937828 A CN 113937828A
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value
actual
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grid
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CN113937828B (en
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彭国平
孙文艺
周治国
张�浩
史奔
王红占
李立冬
宋海军
刘会民
徐元龙
白代兵
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Guangdong Anpu Electric Power Technology Co ltd
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Guangdong Anpu Electric Power Technology Co ltd
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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
    • 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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—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
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

A method, a system and a storage medium for controlling a diode uncontrolled rectifier are provided, wherein the method for controlling the diode uncontrolled rectifier comprises the following steps: calculating the vector amplitude of the output voltage of the network side by using the actual active power of the network side; calculating a grid side output voltage vector angle by using the obtained actual reactive power of the grid side; carrying out space vector change on a grid side output voltage vector angle and a grid side output voltage vector amplitude to obtain a grid side three-phase modulation wave; calculating a D-axis component according to an actual voltage value of a direct current bus on the fan side, a preset rated voltage value, an actual reactive current value and an actual active current value; calculating a Q-axis component according to the actual reactive current value, the actual active current value and a preset reactive current given value; and carrying out inverse DQ vector change on the D-axis component and the Q-axis component to obtain a three-phase modulation wave on the fan side. The invention can ensure the effective power interaction between the wind driven generator and the offshore wind farm power grid, and is particularly suitable for an offshore direct current transmission system based on diode uncontrolled rectification.

Description

Method and system for controlling uncontrolled rectifier of diode and storage medium
Technical Field
The invention belongs to the field of direct current transmission, and particularly relates to a method and a system for controlling an uncontrolled diode rectifier and a storage medium.
Background
With the development of the offshore wind power industry, the offshore wind power plant is further and further away from the continent, and the traditional alternating current grid-connected scheme cannot meet the requirements. Although the flexible direct current transmission has the advantages of small occupied area, small size and the like compared with the traditional direct current transmission, the flexible direct current transmission is still not completely suitable for large-scale and long-distance offshore wind power grid connection. The method for converting current by replacing the controllable rectifier with the diode uncontrolled rectifier can further reduce the size and cost of equipment, so that the method is very suitable for the rectifying end of the offshore wind farm, and correspondingly, the control strategy of the diode uncontrolled rectifier can also be used as one of main research directions of a follow-up offshore wind farm.
However, if the rectifying end of the offshore wind farm adopts a diode uncontrolled rectifier structure, due to the technical reason of the diode uncontrolled rectifying circuit, the energy interaction mode of the grid voltage of the offshore wind farm and the output voltage of the wind driven generator is greatly changed compared with the traditional grid, and the control strategy of changing the reactive power by changing the amplitude of the output voltage and changing the active power by changing the phase of the output voltage in the prior art is difficult to meet the control requirement.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a control method of the uncontrolled diode rectifier, which can meet the control requirement of the uncontrolled diode rectifier. The invention also provides a diode uncontrolled rectifier control system and a computer readable storage medium for executing the diode uncontrolled rectifier control method.
According to the embodiment of the first aspect of the invention, the method for controlling the diode uncontrolled rectifier comprises the following steps:
calculating the vector amplitude of the output voltage at the network side: obtaining actual active power of a power grid side, and calculating an active amplitude difference value according to the actual active power and preset given active power; calculating a net side amplitude increment according to the active amplitude difference value, a preset virtual moment of inertia and a preset virtual damping coefficient; acquiring a per-unit module value of alternating-current voltage of the power grid side, and calculating a grid side output voltage vector amplitude according to the per-unit module value and the grid side amplitude increment;
calculating a grid side output voltage vector angle: acquiring actual reactive power of a power grid side, and calculating an angular speed increment according to the actual reactive power and preset given reactive power; obtaining a rated angular velocity, and calculating a vector angle of the output voltage of the network side according to the rated angular velocity and the angular velocity increment;
carrying out space vector change on the vector angle of the grid side output voltage and the vector amplitude of the grid side output voltage to obtain a grid side three-phase modulation wave Vref_AR、Vref_BR、Vref_CRAnd according to said network-side three-phase modulated wave Vref_AR、Vref_BR、Vref_CRAdjusting the operation of the uncontrolled rectifier network side of the diode;
acquiring an actual voltage value, an actual active current value and an actual reactive current value of a direct current bus on the fan side; calculating a D-axis component according to the actual voltage value, a preset rated voltage value, the actual reactive current value and the actual active current value; calculating a Q-axis component according to the actual reactive current value, the actual active current value and a preset reactive current given value; carrying out inverse DQ vector change on the D-axis component and the Q-axis component to obtain a three-phase modulation wave V on the fan sideref_AL、Vref_BL、Vref_CLAnd according to the three-phase modulated wave V on the fan sideref_AL、Vref_BL、Vref_CLAnd adjusting the operation of the wind turbine side of the uncontrolled rectifier of the diode.
The method for controlling the uncontrolled diode rectifier at least has the following technical effects: the active power output of the wind driven generator to the offshore power grid is changed through the grid side output voltage vector amplitude, and the reactive power output of the wind driven generator to the offshore power grid is changed through the grid side output voltage vector angle. In addition, by utilizing the virtual inertia control principle, the rapid change of the power grid frequency can be effectively restrained.
According to some embodiments of the present invention, the calculating the active amplitude difference according to the actual active power and the preset given active power includes:
adding the actual active power and the given active power to obtain an active power difference value;
and inputting the active power difference value into a first PI regulating unit to obtain the active amplitude difference value.
According to some embodiments of the present invention, the calculating the net side amplitude increment according to the active amplitude difference, the preset virtual moment of inertia and the preset virtual damping coefficient includes:
subtracting the active amplitude difference value and the feedback component to obtain a first intermediate regulating value;
performing integral operation on the first intermediate adjustment value based on the virtual moment of inertia to obtain the net side amplitude increment; and the feedback component is obtained according to the net side amplitude increment and a preset virtual damping coefficient.
According to some embodiments of the invention, the calculating the angular velocity increment according to the actual reactive power and the preset given reactive power comprises the following steps:
subtracting the actual reactive power and the given reactive power to obtain a second intermediate regulating value;
performing hysteresis dead zone control on the second intermediate regulating value to obtain a third intermediate regulating value;
and multiplying the third intermediate adjusting value by a preset proportionality coefficient to obtain the angular velocity increment.
According to some embodiments of the invention, the obtaining of the rated angular velocity comprises:
acquiring a phase calibration trigger signal, wherein the phase calibration trigger signal is obtained by converting a wireless synchronization signal by a synchronization signal receiving module, and the wireless synchronization signal is sent to the synchronization signal receiving module by at least one of Beidou, GPS, Galileo, GLONASS and GNSS/Loran-C;
and determining the rated angular speed according to the phase calibration trigger signal.
According to some embodiments of the invention, said calculating a net side output voltage vector angle from said nominal angular velocity and said angular velocity increment comprises the steps of:
adding the rated angular velocity and the angular velocity increment to obtain an adjusted angular velocity;
and performing integral operation on the adjusting angular velocity to obtain the vector angle of the network side output voltage.
According to some embodiments of the invention, the space vector of the grid side output voltage vector angle and the grid side output voltage vector magnitudeIs changed to obtain a three-phase modulated wave V on the network sideref_AR、Vref_BR、Vref_CRThe method comprises the following steps:
carrying out coordinate change on the grid side output voltage vector angle and the grid side output voltage vector amplitude to obtain a first modulation parameter and a second modulation parameter;
2/3 transformation is carried out on the first modulation parameter and the second modulation parameter to obtain the grid-side three-phase modulation wave Vref_AR、Vref_BR、Vref_CR。
According to a second aspect of the invention, a diode uncontrolled rectifier control system comprises:
the network side amplitude value calculating unit is used for obtaining the actual active power of the power network side, calculating an active amplitude value difference value according to the actual active power and preset given active power, calculating a network side amplitude value increment according to the active amplitude value difference value, preset virtual rotational inertia and a preset virtual damping coefficient, obtaining a per-unit module value of alternating voltage of the power network side, and calculating a network side output voltage vector amplitude value according to the per-unit module value and the network side amplitude value increment;
the system comprises a network side vector angle calculation unit, a network side voltage regulation unit and a network side voltage regulation unit, wherein the network side vector angle calculation unit is used for acquiring actual reactive power of a network side, calculating angular velocity increment according to the actual reactive power and preset given reactive power, acquiring rated angular velocity and calculating a network side output voltage vector angle according to the rated angular velocity and the angular velocity increment;
a grid-side modulation wave generating unit for carrying out space vector variation on the grid-side output voltage vector angle and the grid-side output voltage vector amplitude to obtain a grid-side three-phase modulation wave Vref_AR、Vref_BR、Vref_CRAnd according to said network-side three-phase modulated wave Vref_AR、Vref_BR、Vref_CRAdjusting the operation of the uncontrolled rectifier network side of the diode;
the fan side component calculation unit is used for obtaining an actual voltage value, an actual active current value and an actual reactive current value of a fan side direct current bus, calculating a D-axis component according to the actual voltage value, a preset rated voltage value, the actual reactive current value and the actual active current value, and calculating a Q-axis component according to the actual reactive current value, the actual active current value and a preset reactive current given value;
a fan-side modulation wave generating unit for performing inverse DQ vector change on the D-axis component and the Q-axis component to obtain a fan-side three-phase modulation wave Vref_AL、Vref_BL、Vref_CLAnd according to the three-phase modulated wave V on the fan sideref_AL、Vref_Bl、Vref_CLAnd adjusting the operation of the wind turbine side of the uncontrolled rectifier of the diode.
The diode uncontrolled rectifier control system provided by the embodiment of the invention at least has the following technical effects: the active power output of the wind driven generator to the offshore power grid is changed through the grid side output voltage vector amplitude, and the reactive power output of the wind driven generator to the offshore power grid is changed through the grid side output voltage vector angle. In addition, by utilizing the virtual inertia control principle, the rapid change of the power grid frequency can be effectively restrained.
According to a third aspect of the invention, the computer-readable storage medium stores computer-executable instructions for causing a computer to perform the above-mentioned diode uncontrolled rectifier control method.
The computer-readable storage medium according to the embodiment of the invention has at least the following technical effects: storage and transfer of computer-executable instructions may be facilitated by a storage medium.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of an uncontrolled diode rectifier of an embodiment of the present invention;
fig. 2 is a flow chart of generation of a grid-side three-phase modulated wave according to an embodiment of the present invention;
fig. 3 is a flow chart of generation of a three-phase modulation wave on the fan side according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a dc power transmission system according to an embodiment of the invention;
FIG. 5 is a schematic structural diagram of an offshore converter station of an embodiment of the invention;
fig. 6 is a schematic structural diagram of an onshore converter station according to an embodiment of the invention;
fig. 7 is a schematic structural diagram of a current transformer according to an embodiment of the present invention.
Reference numerals;
wind power generation system 100, wind power generator 110,
An offshore converter station 200, a converter 210, a rectifier transformer 220, a smoothing reactor 230,
An onshore converter station 300, an onshore converter valve 310, an isolation transformer 320,
Marine transmission link 400.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, if there are first, second, third, fourth, etc. described only for the purpose of distinguishing technical features, they are not to be interpreted as indicating or implying relative importance or implying number of indicated technical features or implying precedence of indicated technical features.
In the description of the present invention, unless otherwise explicitly defined, terms such as arrangement, connection and the like should be broadly construed, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the detailed contents of the technical solutions.
The method for controlling the diode uncontrolled rectifier is applied to the diode uncontrolled rectifier, namely two sets of three-phase fully-controlled converters (a fan side and a power grid side) are in a direct-current back-to-back structure, the three-phase fully-controlled converter on the power grid side adjusts the output power of a fan system, and the three-phase fully-controlled converter on the fan side adjusts the voltage of a direct-current bus, and the specific structure is shown in fig. 1. In fig. 1, the left three-phase fully-controlled converter is a fan side, and the right three-phase fully-controlled converter is a power grid side.
The above-mentioned diode uncontrolled rectifier is connected between the output of the wind generator 110 of the dc transmission system and the offshore wind farm grid. In order to better describe the application environment of the diode uncontrolled rectifier control method of the embodiment of the invention, a brief description is given here to the direct current transmission system.
As shown in fig. 4, the direct current transmission system comprises a wind power generation system 100, an offshore converter station 200, an offshore transmission link 400, an onshore converter station 300.
The offshore wind turbine system 100 includes a plurality of wind turbines 110, and the main circuit structures of the diode-uncontrolled rectifiers connected to the output terminals of each wind turbine 110 are shown in fig. 1, and the control strategies are shown in fig. 2 and 3.
Referring to fig. 4 and 5, the offshore converter station 200 includes a rectifier transformer 220 and a converter 210. The primary side of the rectifier transformer 220 is used for connecting the offshore wind power generation system 100, and the secondary side is connected with the input end of the converter 210; the converter 210 adopts a diode rectification structure and is used for converting alternating current output by the offshore wind power generation system 100 into direct current, a positive voltage output end and a negative voltage output end of the converter 210 are both connected with the smoothing reactor 230, and the positive and negative output ends are connected with the onshore converter station 300 through the offshore transmission link 400.
As shown in fig. 7, the converter 210 is configured with an uncontrolled rectifier diode valve in the form of a three-phase bridge six-pulse rectifier, each rectifier arm comprising a plurality of diode devices connected in series. The primary side of the rectifier transformer 220 is used for connecting to the offshore wind power generation system 100, and the secondary side is connected to the input end of the converter 210.
Referring to fig. 4 and 6, the onshore converter station 300 comprises an onshore converter valve 310 and an isolation transformer 320, and is used for converting the dc power output by the offshore converter station 200 into ac power and transmitting the ac power to an onshore power grid. The positive and negative input terminals of the onshore converter valve 310 are connected to the positive and negative output terminals of the offshore converter station 200 via the offshore transmission link 400, the output terminals are connected to the input terminals of the isolation transformer 320, and the output terminals of the isolation transformer 320 are connected to the onshore power grid.
The form of the onshore converter valve 310 may vary. In some embodiments of the present invention, the converter valve adopts an MMC converter valve structure, the MMC converter valve includes 6 bridge arms, each bridge arm is formed by sequentially connecting a plurality of power modules and a bridge arm reactor in series, and the power modules may adopt a half-bridge structure, a full-bridge structure, or a half-bridge and full-bridge mixed connection structure. In some embodiments of the invention, the converter valve is in the form of a thyristor converter valve, the thyristor converter valve is in a three-phase bridge configuration, each bridge arm comprises a plurality of thyristor devices connected in series in sequence, and the thyristor converter valve is connected to the secondary side of the transformer via a connecting reactor.
The marine transmission link 400 is composed of a high voltage direct current submarine cable, a signal optical fiber, and the like.
In addition, the method for controlling the uncontrolled diode rectifier according to the embodiment of the first aspect of the present invention further applies a virtual inertia control principle. Due to the isolation effect of the diode uncontrolled rectifier, the rotor motion of the wind turbine generator and the power grid frequency are decoupled, the equivalent inertia of the system is reduced, and the stability of the system frequency is seriously influenced, so that the virtual inertia control technology is added in the control process of the diode uncontrolled rectifier, and the rapid change of the power grid frequency can be restrained to a certain extent, and the technology is known by a person skilled in the art. The virtual inertia control principle is shown as follows:
Figure BDA0003328504670000081
Figure BDA0003328504670000082
j is the rotational inertia of the virtual synchronous generator; omega is the electrical angular speed of the synchronous generator; theta is the electric gas phase angle of the synchronous generator; omega0Synchronizing the angular speed for the grid; t ismAnd TeMechanical and electromagnetic torques of the synchronous generator, respectively; d is a damping coefficient. Due to the existence of J and D, the converter has inertia to power and frequency.
A method of controlling a diode uncontrolled rectifier according to an embodiment of the first aspect of the invention is described below with reference to fig. 1 to 7.
The method for controlling the diode uncontrolled rectifier comprises the following steps:
calculating the vector amplitude of the output voltage at the network side: obtaining the actual active power P of the power grid sidegAccording to the actual active power PgAnd a preset given active power PrefCalculating an active amplitude difference value; calculating a net side amplitude increment according to the active amplitude difference value, a preset virtual moment of inertia J and a preset virtual damping coefficient D; per unit module value U of AC voltage of electric network side0According to the per unit modulus value U0Calculating the vector amplitude U of the output voltage at the network side by the amplitude increment at the sum network sidem；
Calculating a grid side output voltage vector angle: obtaining the actual reactive power Q of the network side0According to the actual reactive power Q0And a preset given reactive power QrefCalculating angular velocity increment; obtaining a nominal angular velocity omega1According to the rated angular velocity omega1Calculating a grid side output voltage vector angle theta according to the angular velocity increment;
vector angle theta of output voltage on network side and vector amplitude U of output voltage on network sidemSpace vector change is carried out to obtain a three-phase modulation wave V on the network sideref_AR、Vref_BR、Vref_CRAnd according to the three-phase modulated wave V on the network sideref_AR、Vref_BR、Vref_CRAdjusting the operation of the uncontrolled rectifier network side of the diode;
acquiring actual voltage value U of direct current bus on fan sidesdcActual value of active current Is1dAnd the actual value of the reactive current Is1q(ii) a According to the actual voltage value UsdcA preset rated voltage value Usdc_refActual value of reactive current Is1qAnd the actual active current value Is1dCalculating a D-axis component; according to the actual reactive current value Is1qActual value of active current Is1dAnd a preset given value of reactive current IqrefCalculating a Q-axis component; carrying out inverse DQ vector change on the D-axis component and the Q-axis component to obtain a three-phase modulation wave V on the fan sideref_AL、Vref_BL、Vref_CLAnd according to three-phase modulating wave V on fan sideref_AL、Vref_BL、Vref_CLThe trim diode does not control the operation of the wind turbine side of the rectifier.
Referring to fig. 2, the actual active power p when the grid side is presentgWhen the change occurs, the change will be associated with the given active power prefAnd generating a deviation, wherein the deviation outputs an active amplitude difference value after passing through the first PI adjusting unit, and at the moment, the active amplitude difference value needs to be adjusted. In the adjusting process, integration and feedback operation are respectively carried out based on the virtual moment of inertia J and the virtual damping coefficient D, so that the amplitude increment of the network side can be obtained, and the amplitude increment of the network side is subjected to per unit module value U of alternating voltage on the power grid side0The addition operation is carried out to obtain the final regulated network side output voltage vector amplitude Um. Using net side output voltage vector magnitude UmThe regulation of the active power output on the grid side can be accomplished.
Referring to fig. 2, the actual reactive power Q when on the grid side0When fluctuation occurs, the power will be equal to the given reactive power QrefProducing a deviation which is controlled by a hysteresis dead zone and proportional coefficient KqCan obtain the angular velocity increment after multiplication, and the angular velocity increment is obtained by the multiplication with the rated angular velocity omega1And further operation is carried out, and the vector angle theta of the output voltage at the network side can be obtained. The regulation of the reactive power output of the power grid side can be completed by utilizing the grid side output voltage vector angle theta.
With reference to fig. 2, for the implementation of a three-phase fully controlled converter on the grid side of fig. 1Control, the vector angle theta of the output voltage at the network side and the vector amplitude U of the output voltage at the network side are requiredmSpace vector change is carried out to obtain a three-phase modulation wave V on the network sideref_AR、Vref_BR、Vref_CRThen, the three-phase modulated wave V on the network side can be usedref_AR、Vref_BR、Vref_CRAnd adjusting the operation of the three-phase full-control converter on the power grid side.
Fig. 3 shows the control strategy of a three-phase fully controlled converter on the wind turbine side. Acquiring actual voltage value U of direct current bus on fan sidesdcActual value of active current Is1dAnd the actual value of the reactive current Is1qThen, the actual voltage value U can be usedsdcRated voltage value Usdc_refActual value of reactive current Is1qAnd the actual active current value Is1dCalculating D-axis component, and calculating the D-axis component according to the actual reactive current value Is1qActual value of active current Is1dAnd a preset given value of reactive current IqrefThe Q-axis component is calculated. Then, inverse DQ vector change is carried out on the D-axis component and the Q-axis component, and a three-phase modulation wave V on the fan side can be obtainedref_AL、Vref_BL、Vref_CLUsing three-phase modulating wave V on the fan sideref_AL、Vref_BL、Vref_CLAnd adjusting the operation of the three-phase fully-controlled converter on the side of the fan.
According to the method for controlling the uncontrolled rectifier of the diode, the voltage vector amplitude U is output through the network sidemThe active power output of the wind driven generator 110 to the offshore power grid is changed, and the reactive power output of the wind driven generator 110 to the offshore power grid is changed through the grid side output voltage vector angle theta, so that compared with a traditional control mode, the active power output control method can ensure the effective interaction of the power between the wind driven generator 110 and the offshore wind power plant power grid, and is particularly suitable for an offshore direct current power transmission system based on diode uncontrolled rectification. In addition, by utilizing the virtual inertia control principle, the rapid change of the power grid frequency can be effectively restrained.
In some embodiments of the invention, the active power P is determined according togAnd a preset given active power PrefCalculating the active amplitude difference value, including the following stepsThe method comprises the following steps:
to actual active power PgAnd given active power PrefPerforming addition operation to obtain an active power difference value;
and inputting the active power difference value into a first PI regulating unit to obtain an active amplitude difference value.
Referring to fig. 2, the actual active power PgAnd given active power PrefThe active power difference obtained after the addition operation is the actual difference, and the active power adjustment is needed only because of the existence of the active power difference. After the active power difference is subjected to PI adjustment, an active amplitude difference required by subsequent calculation can be obtained.
In some embodiments of the present invention, calculating the net-side amplitude increment according to the active amplitude difference, the preset virtual moment of inertia J, and the preset virtual damping coefficient D, includes the following steps:
subtracting the active amplitude difference value and the feedback component to obtain a first intermediate regulating value;
performing integral operation on the first intermediate adjusting value based on the virtual moment of inertia J to obtain a net side amplitude increment; and the feedback component is obtained according to the net side amplitude increment and a preset virtual damping coefficient D.
Referring to fig. 2, integral operation is performed based on the virtual moment of inertia J, and negative feedback adjustment is further performed using the result of the integral operation, and the negative feedback adjustment is performed based on the virtual damping coefficient D, so that the virtual moment of inertia control principle is effectively applied, and thus, the net-side amplitude increment can be obtained.
In some embodiments of the invention, the actual reactive power Q is based on0And a preset given reactive power QrefCalculating the angular velocity increment, comprising the steps of:
for actual reactive power Q0And given reactive power QrefCarrying out subtraction operation to obtain a second intermediate adjusting value;
performing hysteresis dead zone control on the second intermediate regulating value to obtain a third intermediate regulating value;
to the firstThree intermediate regulating values and a predetermined proportionality coefficient KqMultiplication is performed to obtain the angular velocity increment.
Referring to fig. 2, the calculated actual reactive power Q0And given reactive power QrefIs the variable basis for reactive power regulation. After the difference is calculated and passes through the hysteresis dead zone control, the difference is further mixed with the proportionality coefficient KqAnd performing multiplication operation to obtain the angular velocity increment. Angular velocity increment and rated angular velocity omega1After the addition operation is carried out, the angular velocity value which needs to be adjusted can be obtained, and then the integral operation is carried out on the angular velocity value, so that the vector angle theta of the network side output voltage which needs to be adjusted finally can be obtained. Therefore, the reactive power can be adjusted based on the grid-side output voltage vector angle theta, and the reactive power can be adjusted based on the grid-side output voltage vector amplitude umThe regulation of active power can be completed because the voltage vector amplitude u is output by the network sidemAnd the grid side output voltage vector angle theta is calculated according to the active power and reactive power fluctuation of the power grid side, so that the effective power interaction between the wind driven generator 110 and the offshore wind farm power grid can be ensured by the diode uncontrolled rectifier control method of the embodiment of the invention.
In some embodiments of the invention, the nominal angular velocity ω is obtained1The method comprises the following steps:
acquiring a phase calibration trigger signal, wherein the phase calibration trigger signal is obtained by converting a wireless synchronization signal by a synchronization signal receiving module, and the wireless synchronization signal is sent to the synchronization signal receiving module by at least one of Beidou, GPS, Galileo, GLONASS and GNSS/Loran-C;
determining a nominal angular velocity omega from a phase calibration trigger signal1。
Because the system impedance of the power grid is large, the offshore wind power plant belongs to a weak power grid, and the phase-locked loop technology is difficult to ensure that the fan converter can effectively obtain a power grid phase synchronization signal, so that the problem of system oscillation still exists. According to the control method of the diode uncontrolled rectifier, provided by the embodiment of the invention, the acquisition of the synchronous signal is completed by utilizing time service systems such as the Beidou, the GPS, the Galileo, the GLONASS, the GNSS/Loran-C and the like, so that the subsequently acquired rated angular speed can be more accurate, and the oscillation is avoided.
The Beidou, GPS, Galileo, GLONASS, GNSS/Loran-C and other systems can wirelessly send a synchronization signal in a broadcasting mode, the wireless synchronization signal can be understood as a standard clock signal of the system, and a synchronization signal receiving module can generate a periodically-changing waveform, namely a phase calibration trigger signal, after receiving the standard clock signal. Taking the phase calibration trigger signal as a square wave with a frequency of 1Hz as an example for specific description, taking a falling edge as a trigger condition, when the instant when the square wave signal output by the synchronization signal receiving module jumps from a high level to a low level, i.e. representing that 1 second passes, the wind turbine generator 110 should complete the output of fifty waveforms (50 Hz for the power grid), and should be in a phase of 0 or an initial phase, and then, each time the square wave signal is in the falling edge, the output phase may be determined. Furthermore, an initial phase can be obtained by the phase calibration trigger signal, and a rated angular velocity ω can be further obtained based on the initial phase1. In some embodiments of the present invention, the synchronization signal receiving module may adopt a k801 type GPS beidou dual-mode clock module of shanghai jieli electric limited company to achieve the purpose of outputting an accurate phase calibration trigger signal.
In some embodiments of the invention, the angular velocity ω is determined according to the nominal angular velocity ω1And calculating a grid side output voltage vector angle theta by the angular velocity increment, wherein the method comprises the following steps:
for rated angular velocity omega1Adding the sum and the angular velocity increment to obtain an adjusted angular velocity;
and performing integral operation on the adjusting angular velocity to obtain a network side output voltage vector angle theta.
Referring to fig. 2, in determining the nominal angular velocity ω1And after the angular velocity increment is carried out, the final adjustment angular velocity required to be adjusted can be determined, the adjustment angular velocity is easy to convert into angular frequency, and the corresponding phase angle, namely the grid-side output voltage vector angle theta, can be obtained by carrying out integral operation on the angular frequency. The grid side output voltage vector angle theta corresponds to the reactive power required to be adjusted.
In some embodiments of the invention, the vector angle θ and the vector magnitude U are calculated for the net side output voltagemSpace vector change is carried out to obtain a three-phase modulation wave V on the network sideref_AR、Vref_BR、Vref_CRThe method comprises the following steps:
vector angle theta of output voltage on network side and vector amplitude U of output voltage on network sidemCarrying out coordinate change to obtain a first modulation parameter and a second modulation parameter;
2/3 transformation is carried out on the first modulation parameter and the second modulation parameter to obtain a three-phase modulation wave V on the network sideref_AR、Vref_BR、Vref_CR。
Referring to FIG. 2, the net side output voltage vector angle θ and the net side output voltage vector magnitude UmIs the main basis for the work of a power module in a three-phase full-control converter at the side of a power grid, wherein the vector angle theta of output voltage at the side of the power grid and the vector amplitude U of the output voltage at the side of the power grid are measuredmCoordinate change is carried out to obtain alpha and beta values of the output voltage of the power grid side under a two-phase static coordinate system, and then 2/3 transformation is carried out on the alpha and beta values to obtain a three-phase modulation wave Vref_A、Vref_B、Vref_CFurther, V can be usedref_A、Vref_B、Vref_CAnd the working state of a power module in each phase of the three-phase fully-controlled converter on the caller ID is realized, so that the effects of regulating the output power and the frequency are achieved.
Here, a brief description is given of a three-phase fully controlled converter on the fan side.
Referring to FIG. 3, for the actual voltage value UsdcAnd rated voltage value Usdc_refCarrying out subtraction to obtain a difference value, and carrying out PI regulation on the difference value to obtain an active current given value Idref. Using active current set value IdrefAnd the actual active current value Is1dAnd the actual value of the reactive current Is1qThe D-axis component can be calculated. Using the actual value of the reactive current Is1qAnd given value of reactive current IqrefThe Q-axis component can be calculated quickly. E in FIG. 3dAnd EqFor preset given voltage D component and given voltage Q component, actual active currentValue Is1dIn and EqBefore subtraction, the actual reactive current value I is converted onces1qIn and EdBefore subtraction, the same transformation is performed.
After obtaining the D-axis component and the Q-axis component, coordinate change is carried out to obtain alpha and beta values of the output voltage of the power grid side under a two-phase static coordinate system, and then 2/3 transformation is carried out on the alpha and beta values to obtain a three-phase modulating wave V on the fan sideref_AL、Vref_BL、Vref_CLAnd according to three-phase modulating wave V on fan sideref_AL、Vref_BL、Vref_CLThe trim diode does not control the operation of the wind turbine side of the rectifier. Here, the D-axis component and the Q-axis component do not have frequency characteristics, and here, coordinate conversion is performed using a phase angle θ of the output-side voltage of wind turbine generator 110.
According to a second aspect of the invention, a diode uncontrolled rectifier control system comprises: the system comprises a network side amplitude calculation unit, a network side vector angle calculation unit, a network side modulation wave generation unit, a fan side component calculation unit and a fan side modulation wave generation unit.
A grid side amplitude value calculation unit for obtaining the actual active power P of the grid sidegAnd according to the actual active power PgAnd a preset given active power PrefCalculating an active amplitude difference value, calculating a network side amplitude increment according to the active amplitude difference value, a preset virtual moment of inertia J and a preset virtual damping coefficient D, and obtaining a per unit module value U of alternating voltage of the network side0According to the per unit modulus value U0Calculating the vector amplitude U of the output voltage at the network side by the amplitude increment at the sum network sidem；
A grid side vector angle calculation unit for obtaining the actual reactive power Q of the grid side0And according to the actual reactive power Q0And a preset given reactive power QrefCalculating the angular velocity increment and obtaining the rated angular velocity omega1According to the rated angular velocity omega1Calculating a grid side output voltage vector angle theta according to the angular velocity increment;
net side modulation wave generating sheetElement for comparing vector angle theta of network side output voltage and vector amplitude U of network side output voltagemSpace vector change is carried out to obtain a three-phase modulation wave V on the network sideref_AR、Vref_BR、Vref_CRAnd according to the three-phase modulated wave V on the network sideref_AR、Vref_BR、Vref_CRAdjusting the operation of the uncontrolled rectifier network side of the diode;
a fan side component calculation unit for obtaining the actual voltage value U of the fan side DC bussdcActual value of active current Is1dAnd the actual value of the reactive current Is1qAnd according to the actual voltage value UsdcA preset rated voltage value Usdc_refActual value of reactive current Is1qAnd the actual active current value Is1dCalculating the D-axis component and according to the actual reactive current value Is1qActual value of active current Is1dAnd a preset given value of reactive current IqrefCalculating a Q-axis component;
a fan-side modulation wave generating unit for performing inverse DQ vector change on the D-axis component and the Q-axis component to obtain a three-phase modulation wave V on the fan sideref_AL、Vref_BL、Vref_CLAnd according to three-phase modulating wave V on fan sideref_AL、Vref_BL、Vref_CLThe trim diode does not control the operation of the wind turbine side of the rectifier.
Referring to fig. 2, the actual active power P when the grid side is activegWhen fluctuation occurs, the power will be equal to the given active power PrefAnd generating deviation, wherein the deviation outputs an active amplitude difference value after passing through the first PI adjusting unit, and the active amplitude difference value needs to be corrected at the moment. In the correction process, the net side amplitude increment can be obtained through the per unit module value U of the alternating voltage of the electric network side based on the respective integral and feedback operation of the virtual moment of inertia J and the virtual damping coefficient D0The addition operation is carried out to obtain the final regulated network side output voltage vector amplitude Um. Using net side output voltage vector magnitude UmThe regulation of the active power output on the grid side can be accomplished.
With reference to FIG. 2, when the grid sideActual reactive power Q0When fluctuation occurs, the power will be equal to the given reactive power QrefProducing a deviation which is controlled by a hysteresis dead zone and proportional coefficient KqCan obtain the angular velocity increment after multiplication, and the angular velocity increment is obtained by the multiplication with the rated angular velocity omega0And further operation is carried out, and the vector angle theta of the output voltage at the network side can be obtained. The regulation of the reactive power output of the power grid side can be completed by utilizing the grid side output voltage vector angle theta.
Referring to fig. 2, in order to complete the control of the three-phase fully-controlled converter on the grid side in fig. 1, the grid-side output voltage vector angle θ and the grid-side output voltage vector magnitude U need to be setmSpace vector change is carried out to obtain a three-phase modulation wave V on the network sideref_AR、Vref_BR、Vref_CRThen, the three-phase modulated wave V on the network side can be usedref_AR、Vref_BR、Vref_CRAnd adjusting the operation of the three-phase full-control converter on the power grid side.
Fig. 3 shows the control strategy of a three-phase fully controlled converter on the wind turbine side. Acquiring actual voltage value U of direct current bus on fan sidesdcActual value of active current Is1dAnd the actual value of the reactive current Is1qThen, the actual voltage value U can be usedsdcRated voltage value Usdc_refAnd the actual active current value Is1dCalculating D-axis component, and calculating the D-axis component according to the actual reactive current value Is1qAnd a preset given value of reactive current IqrefThe Q-axis component is calculated. Then, inverse DQ vector change is carried out on the D-axis component and the Q-axis component, and a three-phase modulation wave V on the fan side can be obtainedref_AL、Vref_BL、Vref_CLUsing three-phase modulating wave V on the fan sideref_AL、Vref_BL、Vref_CLAnd adjusting the operation of the three-phase fully-controlled converter on the side of the fan.
According to the diode uncontrolled rectifier control system provided by the embodiment of the invention, the active power output of the wind driven generator 110 to the offshore power grid is changed through the grid side output voltage vector amplitude, and the reactive power output of the wind driven generator 110 to the offshore power grid is changed through the grid side output voltage vector angle. In addition, by utilizing the virtual inertia control principle, the rapid change of the power grid frequency can be effectively restrained.
According to a third aspect of the invention, a computer-readable storage medium stores computer-executable instructions for causing a computer to perform the above-mentioned diode uncontrolled rectifier control method.
Computer-readable storage media according to embodiments of the present invention may facilitate storage and transfer of computer-executable instructions by the storage media.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the embodiments, and those skilled in the art will understand that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (9)

1. A method for controlling a diode uncontrolled rectifier is characterized by comprising the following steps:
calculating the vector amplitude of the output voltage at the network side: obtaining actual active power of a power grid side, and calculating an active amplitude difference value according to the actual active power and preset given active power; calculating a net side amplitude increment according to the active amplitude difference value, a preset virtual moment of inertia and a preset virtual damping coefficient; acquiring a per-unit module value of alternating-current voltage of the power grid side, and calculating a grid side output voltage vector amplitude according to the per-unit module value and the grid side amplitude increment;
calculating a grid side output voltage vector angle: acquiring actual reactive power of a power grid side, and calculating an angular speed increment according to the actual reactive power and preset given reactive power; obtaining a rated angular velocity, and calculating a vector angle of the output voltage of the network side according to the rated angular velocity and the angular velocity increment;
carrying out space vector change on the vector angle of the grid side output voltage and the vector amplitude of the grid side output voltage to obtain a grid side three-phase modulation wave Vref_AR、Vref_BR、Vref_CRAnd according to said network-side three-phase modulated wave Vref_AR、Vref_BR、Vref_CRAdjusting the operation of the uncontrolled rectifier network side of the diode;
acquiring an actual voltage value, an actual active current value and an actual reactive current value of a direct current bus on the fan side; calculating a D-axis component according to the actual voltage value, a preset rated voltage value, the actual reactive current value and the actual active current value; calculating a Q-axis component according to the actual reactive current value, the actual active current value and a preset reactive current given value; carrying out inverse DQ vector change on the D-axis component and the Q-axis component to obtain a three-phase modulation wave V on the fan sideref_AL、Vref_BL、Vref_CLAnd according to the three-phase modulated wave V on the fan sideref_AL、Vref_BL、Vref_CLAnd adjusting the operation of the wind turbine side of the uncontrolled rectifier of the diode.
2. The method for controlling the uncontrolled rectifier of the diode according to claim 1, wherein the step of calculating the active amplitude difference value according to the actual active power and the preset given active power comprises the following steps:
adding the actual active power and the given active power to obtain an active power difference value;
and inputting the active power difference value into a first PI regulating unit to obtain the active amplitude difference value.
3. The method for controlling the uncontrolled rectifier of the diode according to claim 1, wherein the step of calculating the net side amplitude increment according to the active amplitude difference value, the preset virtual moment of inertia and the preset virtual damping coefficient comprises the following steps:
subtracting the active amplitude difference value and the feedback component to obtain a first intermediate regulating value;
performing integral operation on the first intermediate adjustment value based on the virtual moment of inertia to obtain the net side amplitude increment; and the feedback component is obtained according to the net side amplitude increment and a preset virtual damping coefficient.
4. The method for controlling the uncontrolled rectifier of the diode according to claim 1, wherein the step of calculating the angular velocity increment according to the actual reactive power and the preset given reactive power comprises the following steps:
subtracting the actual reactive power and the given reactive power to obtain a second intermediate regulating value;
performing hysteresis dead zone control on the second intermediate regulating value to obtain a third intermediate regulating value;
and multiplying the third intermediate adjusting value by a preset proportionality coefficient to obtain the angular velocity increment.
5. The method of claim 1, wherein said obtaining a nominal angular velocity comprises the steps of:
acquiring a phase calibration trigger signal, wherein the phase calibration trigger signal is obtained by converting a wireless synchronization signal by a synchronization signal receiving module, and the wireless synchronization signal is sent to the synchronization signal receiving module by at least one of Beidou, GPS, Galileo, GLONASS and GNSS/Loran-C;
and determining the rated angular speed according to the phase calibration trigger signal.
6. The method of claim 1, wherein said calculating a net side output voltage vector angle from said nominal angular velocity and said angular velocity increment comprises the steps of:
adding the rated angular velocity and the angular velocity increment to obtain an adjusted angular velocity;
and performing integral operation on the adjusting angular velocity to obtain the vector angle of the network side output voltage.
7. The method as claimed in claim 1, wherein the space vector variation of the grid-side output voltage vector angle and the grid-side output voltage vector magnitude is performed to obtain a grid-side three-phase modulated wave Vref_AR、Vref_BR、Vref_CRThe method comprises the following steps:
carrying out coordinate change on the grid side output voltage vector angle and the grid side output voltage vector amplitude to obtain a first modulation parameter and a second modulation parameter;
2/3 transformation is carried out on the first modulation parameter and the second modulation parameter to obtain the grid-side three-phase modulation wave Vref_AR、Vref_BR、Vref_CR。
8. A diode uncontrolled rectifier control system, comprising:
the network side amplitude value calculating unit is used for obtaining the actual active power of the power network side, calculating an active amplitude value difference value according to the actual active power and preset given active power, calculating a network side amplitude value increment according to the active amplitude value difference value, preset virtual rotational inertia and a preset virtual damping coefficient, obtaining a per-unit module value of alternating voltage of the power network side, and calculating a network side output voltage vector amplitude value according to the per-unit module value and the network side amplitude value increment;
the system comprises a network side vector angle calculation unit, a network side voltage regulation unit and a network side voltage regulation unit, wherein the network side vector angle calculation unit is used for acquiring actual reactive power of a network side, calculating angular velocity increment according to the actual reactive power and preset given reactive power, acquiring rated angular velocity and calculating a network side output voltage vector angle according to the rated angular velocity and the angular velocity increment;
a grid-side modulation wave generating unit for carrying out space vector variation on the grid-side output voltage vector angle and the grid-side output voltage vector amplitude to obtain a grid-side three-phase modulation wave Vref_AR、Vref_BR、Vref_CRAnd according to said network-side three-phase modulated wave Vref_AR、Vref_BR、Vref_CRAdjusting the operation of the uncontrolled rectifier network side of the diode;
the fan side component calculation unit is used for obtaining an actual voltage value, an actual active current value and an actual reactive current value of a fan side direct current bus, calculating a D-axis component according to the actual voltage value, a preset rated voltage value, the actual reactive current value and the actual active current value, and calculating a Q-axis component according to the actual reactive current value, the actual active current value and a preset reactive current given value;
a fan-side modulation wave generating unit for performing inverse DQ vector change on the D-axis component and the Q-axis component to obtain a fan-side three-phase modulation wave Vref_AL、Vref_BL、Vref_CLAnd according to the three-phase modulated wave V on the fan sideref_AL、Vref_BL、Vref_CLAnd adjusting the operation of the wind turbine side of the uncontrolled rectifier of the diode.
9. A computer-readable storage medium characterized by: the computer-readable storage medium stores computer-executable instructions for causing a computer to perform the diode uncontrolled rectifier control method of any of claims 1 to 7.
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