CN113937828B - Diode uncontrolled rectifier control method, system and storage medium - Google Patents
Diode uncontrolled rectifier control method, system and storage medium Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—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
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
A diode uncontrolled rectifier control method, system and storage medium, the diode uncontrolled rectifier control method includes: calculating the vector amplitude of the output voltage of the grid side by using the actual active power of the grid side; calculating a vector angle of the output voltage of the grid side by using the obtained actual reactive power of the grid side; carrying out space vector change on the vector angle of the output voltage of the network side and the vector amplitude of the output voltage of the network side so as to obtain three-phase modulation waves of the network side; calculating a D-axis component according to an actual voltage value, a preset rated voltage value, an actual reactive current value and an actual active current value of a fan-side direct current bus; 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 performing inverse DQ vector change on the D-axis component and the Q-axis component to obtain the fan-side three-phase modulation wave. 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
Technical Field
The invention belongs to the field of direct-current transmission, and particularly relates to a control method, a system and a storage medium of a diode uncontrolled rectifier.
Background
With the development of the offshore wind power industry, the offshore wind farm is further and further away from the continent, and the conventional alternating current grid-connected scheme cannot meet the requirements. Although the flexible direct current transmission has the advantages of small occupied area, small volume 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 the current of the controllable rectifier by using the diode uncontrolled rectifier can further reduce the volume and the 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 is also used as one of main research directions of the subsequent offshore wind farm.
However, if the rectification end of the offshore wind farm adopts a diode uncontrolled rectifier structure, due to the technical reason of the diode uncontrolled rectifier circuit, the energy interaction mode of the voltage of the offshore wind farm power grid and the output voltage of the wind driven generator is greatly changed compared with that of the traditional power grid, and the existing control strategy of changing reactive power by changing the amplitude of the output voltage and changing active power by changing the phase of the output voltage is difficult to meet the control requirement.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a control method of the diode uncontrolled rectifier, which can meet the control requirement of the diode uncontrolled rectifier. The invention also proposes a diode-uncontrolled rectifier control system and a computer-readable storage medium for performing the above-mentioned diode-uncontrolled rectifier control method.
According to an embodiment of the first aspect of the present invention, a method for controlling a diode-uncontrolled rectifier includes the steps of:
calculating the vector amplitude of the output voltage at the network side: acquiring 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, the preset virtual moment of inertia and the preset virtual damping coefficient; acquiring a per unit module value of alternating voltage at a power grid side, and calculating a vector amplitude of output voltage at the grid side according to the per unit module value and the amplitude increment at the grid side;
calculating a vector angle of the output voltage at the network side: 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 at the grid side according to the rated angular velocity and the angular velocity increment;
performing 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 V ref_AR 、V ref_BR 、V ref_CR And according to the three-phase modulation wave V at the net side ref_AR 、V ref_BR 、V ref_CR Adjusting the operation of the grid side of the diode uncontrolled rectifier;
acquiring an actual voltage value, an actual active current value and an actual reactive current value of a direct current bus at a 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; the D axis component and the Q axis component are subjected to inverse DQ vector change to obtain a fan-side three-phase modulation wave V ref_AL 、V ref_BL 、V ref_CL And according to the three-phase modulation wave V on the fan side ref_AL 、V ref_BL 、V ref_CL The operation of the diode-uncontrolled rectifier fan side is regulated.
The control method of the diode uncontrolled rectifier according to the embodiment of the invention has at least the following technical effects: the active power output of the wind driven generator to the offshore power grid is changed through the vector amplitude of the grid-side output voltage, the reactive power output of the wind driven generator to the offshore power grid is changed through the vector angle of the grid-side output voltage, and compared with a traditional control mode, the method can ensure effective power interaction between the wind driven generator and the offshore wind farm 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 frequency of the power grid can be effectively restrained.
According to some embodiments of the invention, the calculating the active amplitude difference according to the actual active power and the preset given active power includes the following steps:
performing addition operation on 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 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 the following steps:
subtracting the difference value of the active amplitude 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; 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 from the given reactive power to obtain a second intermediate adjustment value;
performing hysteresis dead zone control on the second intermediate adjustment value to obtain a third intermediate adjustment value;
and multiplying the third intermediate regulating value by a preset proportional coefficient to obtain the angular velocity increment.
According to some embodiments of the invention, the obtaining the rated angular velocity comprises the following steps:
acquiring a phase calibration trigger signal, wherein the phase calibration trigger signal is obtained by converting a wireless synchronous signal by a synchronous signal receiving module, and the wireless synchronous signal is transmitted to the synchronous signal receiving module by at least one of Beidou, GPS, galileo, GLONASS and GNSS/Loran-C;
and determining the rated angular velocity according to the phase calibration trigger signal.
According to some embodiments of the invention, the calculating the grid-side output voltage vector angle according to the rated angular velocity and the angular velocity increment comprises the steps of:
performing addition operation on the rated angular velocity and the angular velocity increment to obtain an adjusted angular velocity;
and carrying out integral operation on the adjustment angular velocity to obtain the vector angle of the grid-side output voltage.
According to some embodiments of the invention, the spatial vector variation is performed 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 V ref_AR 、V ref_BR 、V ref_CR Comprising the following steps:
carrying out coordinate change on the vector angle of the grid-side output voltage and the vector amplitude of the grid-side output voltage to obtain a first modulation parameter and a second modulation parameter;
2/3 transforming the first modulation parameter and the second modulation parameter to obtain the network side three-phase modulation wave V ref_AR 、V ref_BR 、V ref_CR 。
A diode-uncontrolled rectifier control system according to an embodiment of the second aspect of the present invention includes:
the network side amplitude calculation unit is used for obtaining actual active power of the power grid side, calculating an active amplitude difference value according to the actual active power and preset given active power, calculating a network side amplitude increment according to the active amplitude difference value, preset virtual moment of inertia and preset virtual damping coefficient, obtaining a per unit module value of alternating voltage of the power grid side, and calculating a network side output voltage vector amplitude according to the per unit module value and the network side amplitude increment;
the network side vector angle calculation unit is used for obtaining actual reactive power of a power grid side, calculating an angular speed increment according to the actual reactive power and preset given reactive power, obtaining a rated angular speed, and calculating a network side output voltage vector angle according to the rated angular speed and the angular speed increment;
a grid-side modulation wave generating unit for performing space vector change 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 V ref_AR 、V ref_BR 、V ref_CR And according to the three-phase modulation wave V at the net side ref_AR 、V ref_BR 、V ref_CR Adjusting the operation of the grid side of the diode uncontrolled rectifier;
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 V ref_AL 、V ref_BL 、V ref_CL And according to the three-phase modulation wave V on the fan side ref_AL 、V ref_Bl 、V ref_CL The operation of the diode-uncontrolled rectifier fan side is regulated.
The diode uncontrolled rectifier control system provided by the embodiment of the invention has at least the following technical effects: the active power output of the wind driven generator to the offshore power grid is changed through the vector amplitude of the grid-side output voltage, the reactive power output of the wind driven generator to the offshore power grid is changed through the vector angle of the grid-side output voltage, and compared with a traditional control mode, the method can ensure effective power interaction between the wind driven generator and the offshore wind farm 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 frequency of the power grid can be effectively restrained.
According to an embodiment of the third aspect of the invention, the computer-readable storage medium stores computer-executable instructions for causing a computer to execute the diode-uncontrolled rectifier control method described above.
The computer-readable storage medium according to the embodiment of the present 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 foregoing or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a diode-controlled rectifier according to an embodiment of the invention;
FIG. 2 is a flow chart of generation of a network-side three-phase modulated wave according to an embodiment of the present invention;
FIG. 3 is a flow chart of generation of a fan-side three-phase modulated wave in 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 present invention;
fig. 5 is a schematic view of the structure of an offshore converter station according to an embodiment of the invention;
fig. 6 is a schematic structural view of an onshore converter station of 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,
Offshore converter station 200, converter 210, rectifier transformer 220, smoothing reactor 230,
An onshore converter station 300, an onshore converter valve 310, an isolation transformer 320,
Offshore transmission link 400.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, the description of the first, second, third, fourth, etc. if any is used solely for the purpose of distinguishing between technical features and not as an indication or implying a relative importance or implying a number of technical features indicated or a precedence relationship of technical features indicated.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical solution.
The control method of the diode uncontrolled rectifier is applied to the diode uncontrolled rectifier, namely, two sets of three-phase full-control converters (a fan side and a power grid side) are in a direct-current back-to-back structure, the power grid side three-phase full-control converters regulate the output power of a fan system, and the fan side three-phase full-control converters regulate the direct-current bus voltage, and the specific structure is shown in figure 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 diode uncontrolled rectifier is connected between the output of the wind generator 110 of the dc power transmission system and the offshore wind farm grid. In order to better describe the application environment of the diode-uncontrolled rectifier control method according to the embodiment of the present invention, a brief description is given here of a dc power transmission system.
As shown in fig. 4, the dc power transmission system includes a wind power generation system 100, an offshore converter station 200, an offshore transmission link 400, and an onshore converter station 300.
The offshore wind power generation system 100 comprises a plurality of wind power generators 110, wherein the main circuit structure of a diode uncontrolled rectifier connected with the output end of each wind power generator 110 is 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 being connected to 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 positive and negative output ends are connected with the offshore converter station 300 through the offshore transmission link 400.
As shown in fig. 7, the internal structure of the converter 210 adopts an uncontrolled rectifying diode valve, the diode valve adopts a three-phase bridge type six-pulse rectifying structure, and each rectifying bridge arm comprises a plurality of diode devices connected in series in sequence. The primary side of the rectifier transformer 220 is used for being connected 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 includes an onshore converter valve 310 and an isolation transformer 320 for converting the dc power output from the offshore converter station 200 into ac power and supplying the ac power to an onshore power grid. The positive and negative input ends of the shore converter valve 310 are connected to the positive and negative output ends of the offshore converter station 200 through the offshore transmission link 400, the output ends are connected with the input ends of the isolation transformer 320, and the output ends of the isolation transformer 320 are connected to the shore power grid.
There are a variety of forms for the onshore converter valve 310. In some embodiments of the present invention, the converter valve adopts an MMC converter valve structure, where 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 or a full-bridge structure or a half-bridge full-bridge hybrid 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 structure, each bridge arm comprises a plurality of thyristor devices which are sequentially connected in series, and the thyristor converter valve is connected with the secondary side of the transformer through a connecting reactor.
The offshore transmission link 400 is comprised of a high voltage dc submarine cable, signal fiber, etc.
In addition, the control method of the diode uncontrolled rectifier in the first aspect of the invention also applies the virtual inertia control principle. Because the isolation function of the diode uncontrolled rectifier is that the rotor motion of the wind turbine generator is decoupled from the power grid frequency, the equivalent inertia of the system is reduced, and the stability of the system frequency is seriously affected. The virtual inertia control principle is shown as follows:
wherein J is the rotational inertia of the virtual synchronous generator; omega is the electrical angular velocity of the synchronous generator; θ is the synchronous generator electrical phase angle; omega 0 Synchronizing angular speed for the grid; t (T) m And T e Mechanical and electromagnetic torque of the synchronous generator respectively; d is a damping coefficient. The current transformer has inertia to power and frequency due to the presence of J and D.
A diode-uncontrolled rectifier control method according to an embodiment of the first aspect of the present invention is described below with reference to fig. 1 to 7.
The control method of the diode uncontrolled rectifier according to the embodiment of the invention comprises the following steps:
calculating the vector amplitude of the output voltage at the network side: obtaining actual active power P of power grid side g According to the actual active power P g And a preset given active power P ref Calculating an active amplitude value difference value; calculating a net side amplitude increment according to the difference value of the active amplitude, the preset virtual moment of inertia J and the preset virtual damping coefficient D; obtaining per unit module value U of alternating voltage at power grid side 0 According to per unit modulus U 0 And calculating the net side output voltage vector amplitude U by the net side amplitude increment m ；
Calculating a vector angle of the output voltage at the network side: obtaining actual reactive power Q of power grid side 0 According to the actual reactive power Q 0 And preset given reactive power Q ref Calculating an angular velocity increment; obtaining a rated angular velocity omega 1 According to the nominal angular velocity omega 1 And calculating a grid-side output voltage vector angle theta by the angular velocity increment;
for the vector angle theta of the output voltage at the net side and the vector amplitude U of the output voltage at the net side m Space vector change is carried out to obtain a network side three-phase modulation wave V ref_AR 、V ref_BR 、V ref_CR And according to the three-phase modulation wave V on the net side ref_AR 、V ref_BR 、V ref_CR Adjusting the operation of the grid side of the diode uncontrolled rectifier;
acquiring an actual voltage value U of a fan-side direct current bus sdc Actual active current value I s1d And an actual reactive current value I s1q The method comprises the steps of carrying out a first treatment on the surface of the According to the actual voltage value U sdc Preset rated voltage value U sdc_ref Actual reactive current value I s1q And an actual active current value I s1d Calculating a D-axis component; according to the actual reactive current value I s1q Actual active current value I s1d And a preset reactive current setpoint I qref Calculating a Q-axis component; the D-axis component and the Q-axis component are subjected to inverse DQ vector change to obtain a fan-side three-phase modulation wave V ref_AL 、V ref_BL 、V ref_CL And according to the three-phase modulation wave V at the fan side ref_AL 、V ref_BL 、V ref_CL The adjustment diode does not control the operation of the rectifier fan side.
Referring to fig. 2, when the actual active power p on the grid side g When the change occurs, the given active power is thenPower p ref And generating a deviation, and outputting an active amplitude value difference value after the deviation passes through the first PI adjusting unit, wherein the active amplitude value difference value needs to be adjusted at the moment. In the adjustment 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 a net side amplitude increment can be obtained, and the net side amplitude increment passes through a per unit module value U of alternating voltage on the power grid side 0 Adding to obtain the final net side output voltage vector amplitude U m . By means of the vector amplitude U of the output voltage at the network side m The adjustment of the active power output on the grid side can be accomplished.
Referring to fig. 2, when the actual reactive power Q at the grid side 0 When the fluctuation occurs, the reactive power Q is equal to the given reactive power Q ref Generating a deviation, which is controlled by hysteresis dead zone and is related to a proportionality coefficient K q After multiplication of (a) an angular velocity increase is obtained by a multiplication with the nominal angular velocity omega 1 And further calculation is carried out, so that the vector angle theta of the grid-side output voltage can be obtained. The reactive power output on the grid side can be adjusted by using the vector angle theta of the output voltage on the grid side.
Referring to fig. 2, in order to complete the control of the three-phase fully-controlled converter on the grid side of fig. 1, it is necessary to set the grid side output voltage vector angle θ and the grid side output voltage vector magnitude U m Space vector change is carried out to obtain a network side three-phase modulation wave V ref_AR 、V ref_BR 、V ref_CR The three-phase modulation wave V on the net side can be used ref_AR 、V ref_BR 、V ref_CR And adjusting the operation of the three-phase full-control converter at the power grid side.
Fig. 3 shows a control strategy of a three-phase fully controlled converter on the wind turbine side. Acquiring an actual voltage value U of a fan-side direct current bus sdc Actual active current value I s1d And an actual reactive current value I s1q Then, according to the actual voltage value U sdc Rated voltage value U sdc_ref Actual reactive current value I s1q And an actual active current value I s1d The D-axis component is calculated and can be simultaneously calculated according to the actual reactive current value I s1q Actual active current value I s1d And a preset reactive current setpoint I qref The Q-axis component is calculated. Then, the D axis component and the Q axis component are subjected to inverse DQ vector change to obtain a fan side three-phase modulation wave V ref_AL 、V ref_BL 、V ref_CL By using three-phase modulation wave V at fan side ref_AL 、V ref_BL 、V ref_CL And adjusting the operation of the three-phase full-control converter at the side of the fan.
According to the diode uncontrolled rectifier control method provided by the embodiment of the invention, the voltage vector amplitude U is output through the network side m The active power output of the wind driven generator 110 to the offshore power grid is changed, the reactive power output of the wind driven generator 110 to the offshore power grid is changed through the vector angle theta of the grid-side output voltage, and compared with a traditional control mode, the method can ensure effective power interaction between the wind driven generator 110 and the offshore wind farm power grid, and is particularly suitable for an offshore direct current transmission system based on diode uncontrolled rectification. In addition, by utilizing the virtual inertia control principle, the rapid change of the frequency of the power grid can be effectively restrained.
In some embodiments of the invention, the active power P is based on g And a preset given active power P ref Calculating an active amplitude difference value, comprising the following steps:
for actual active power P g And given active power P ref Performing addition operation to obtain an active power difference value;
the active power difference is input to a first PI adjusting unit to obtain an active amplitude difference.
Referring to fig. 2, the actual active power P g And given active power P ref The active power difference obtained after the addition operation is the actual difference, and the active power adjustment is only needed because of the active power difference. After PI adjustment is performed on the active power difference value, the active amplitude difference value required by subsequent calculation can be obtained.
In some embodiments of the present invention, the network side amplitude increment is calculated according to the active amplitude difference, the preset virtual moment of inertia J and the preset virtual damping coefficient D, and the method includes the following steps:
subtracting the difference value of the active amplitude 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 J to obtain a net side amplitude increment; the feedback component is obtained according to the amplitude increment of the network side and a preset virtual damping coefficient D.
Referring to fig. 2, the integration operation is performed based on the virtual moment of inertia J, and the negative feedback adjustment is further performed by using the result of the integration 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 utilized, and the net-side amplitude increment can be obtained.
In some embodiments of the invention, the reactive power Q is based on actual 0 And preset given reactive power Q ref Calculating an angular velocity increment, comprising the steps of:
for actual reactive power Q 0 And given reactive power Q ref Performing subtraction operation to obtain a second intermediate adjustment value;
performing hysteresis dead zone control on the second intermediate adjustment value to obtain a third intermediate adjustment value;
for the third intermediate adjustment value and the preset scaling factor K q Multiplication is performed to obtain the angular velocity increment.
Referring to fig. 2, the calculated actual reactive power Q 0 And given reactive power Q ref Is the variable basis for reactive power regulation. The difference value is calculated and controlled by hysteresis dead zone and then is matched with the proportional coefficient K q And multiplying to obtain the angular velocity increment. Angular velocity increment and rated angular velocity omega 1 After addition operation, the angular velocity value to be adjusted can be obtained, and then integral operation is carried out on the angular velocity value, so that the vector angle theta of the net side output voltage to be finally adjusted can be obtained. So far, the reactive power can be regulated based on the vector angle theta of the output voltage of the network side, and the reactive power is regulated based on the vector amplitude u of the output voltage of the network side m The active power can be regulated because of the network sideOutput voltage vector magnitude u m And the grid-side output voltage vector angle theta is calculated and formed according to the active power and reactive power fluctuation of the grid side, so that the power effective interaction between the wind driven generator 110 and the offshore wind farm grid can be ensured by the diode uncontrolled rectifier control method provided by the embodiment of the invention.
In some embodiments of the invention, the nominal angular velocity ω is obtained 1 The method comprises the following steps of:
acquiring a phase calibration trigger signal, wherein the phase calibration trigger signal is obtained by converting a wireless synchronous signal by a synchronous signal receiving module, and the wireless synchronous signal is transmitted to the synchronous 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 signal 1 。
Because the system impedance of the power grid is large, the offshore wind farm belongs to a weak power grid, and the phase-locked loop technology is difficult to ensure that the fan converter can effectively obtain the power grid phase synchronization signal, so that the problem of system oscillation still exists. According to the diode uncontrolled rectifier control method, synchronous signals are obtained by using time service systems such as Beidou, GPS, galileo, GLONASS and GNSS/Loran-C, so that the subsequently obtained rated angular speed can be more accurate, and oscillation is avoided.
The systems such as Beidou, GPS, galileo, GLONASS, GNSS/Loran-C and the like can wirelessly transmit the synchronous signals in a broadcast mode, the wireless synchronous signals can be understood as standard clock signals of the system, and the synchronous signal receiving module can generate waveforms with periodic changes after receiving the standard clock signals, namely phase calibration trigger signals. Taking the phase calibration triggering signal as a square wave with the frequency of 1Hz as an example, taking the falling edge as a triggering condition, when the square wave signal output by the synchronous signal receiving module jumps from high level to low level, namely representing that 1 second passes, the wind driven generator 110 should finish outputting fifty waveforms (50 Hz of the power grid) and should be in 0 phase or initial phase at the moment, and then each time the square wave signal is in the falling edgeThe primary output phase may be determined. Furthermore, an initial phase can be obtained from the phase calibration trigger signal, and the nominal angular velocity ω can be further obtained based on the initial phase 1 . In some embodiments of the present invention, the synchronization signal receiving module may use a k801 type GPS beidou dual-mode clock module of Shanghai sharp electric limited company, so as to achieve the purpose of outputting a precise phase calibration trigger signal.
In some embodiments of the invention, the angular velocity ω is based on the nominal value 1 And calculating a net side output voltage vector angle θ by the angular velocity increase, comprising the steps of:
for rated angular velocity omega 1 Adding the angular velocity increment to obtain an adjusted angular velocity;
and carrying out integral operation on the adjustment angular speed to obtain a vector angle theta of the grid-side output voltage.
Referring to fig. 2, at the determination of the nominal angular velocity ω 1 And after the angular velocity increment, the finally adjusted angular velocity can be determined, the adjusted angular velocity is easily converted into angular frequency, and the corresponding phase angle, namely the vector angle theta of the network side output voltage, can be obtained through integral operation of the angular frequency. The vector angle theta of the output voltage at the network side corresponds to reactive power to be adjusted.
In some embodiments of the invention, the vector angle θ and the vector magnitude U of the grid-side output voltage are measured m Space vector change is carried out to obtain a network side three-phase modulation wave V ref_AR 、V ref_BR 、V ref_CR Comprising the following steps:
for the vector angle theta of the output voltage at the net side and the vector amplitude U of the output voltage at the net side m Carrying out coordinate change to obtain a first modulation parameter and a second modulation parameter;
2/3 conversion is carried out on the first modulation parameter and the second modulation parameter to obtain a network side three-phase modulation wave V ref_AR 、V ref_BR 、V ref_CR 。
Referring to fig. 2, a grid-side output voltage vector angle θ and a grid-side output voltage vector magnitude U m Is the main basis for the work of the power module in the three-phase full-control converter at the power grid side, whichInner pair net side output voltage vector angle θ and net side output voltage vector magnitude U m The coordinate change is carried out to obtain alpha and beta values of the output voltage at the power grid side under a two-phase static coordinate system, and then the alpha and beta are subjected to 2/3 conversion to obtain a three-phase modulation wave V ref_A 、V ref_B 、V ref_C Further, V can be used ref_A 、V ref_B 、V ref_C The working states of the power modules in each phase of the three-phase full-control converter at the power grid side are reached, so that the effect of adjusting output power and frequency is achieved.
A brief description will be given here of a three-phase fully controlled current transformer on the wind turbine side.
Referring to FIG. 3, for the actual voltage value U sdc And rated voltage value U sdc_ref Subtracting to obtain a difference value, PI-regulating the difference value to obtain an active current given value I dref . By means of the active current set-point I dref And an actual active current value I s1d And an actual reactive current value I s1q The D-axis component can be calculated. By using the actual reactive current value I s1q And reactive current setpoint I qref The Q-axis component can be calculated quickly. E in FIG. 3 d And E is q For a preset given voltage D component and a preset voltage Q component, the actual active current value I s1d At and E q Before subtraction, the actual reactive current value I is converted once s1q At and E d A transformation is also performed before subtraction.
After the D axis component and the Q axis component are obtained, coordinate change is carried out to obtain alpha and beta values of the output voltage at the power grid side under a two-phase static coordinate system, and then 2/3 conversion is carried out on the alpha and beta to obtain a fan side three-phase modulation wave V ref_AL 、V ref_BL 、V ref_CL And according to the three-phase modulation wave V at the fan side ref_AL 、V ref_BL 、V ref_CL The adjustment diode does not control the operation of the rectifier fan side. Here, the D-axis component and the Q-axis component do not have frequency characteristics, and the coordinate transformation is performed using the phase angle θ of the voltage at the output side of the wind turbine 110 when the coordinate transformation is performed.
A diode-uncontrolled rectifier control system according to an embodiment of the second aspect of the present invention includes: a net side amplitude value calculation unit, a net side vector angle calculation unit, a net side modulation wave generation unit, a fan side component calculation unit and a fan side modulation wave generation unit.
A network side amplitude calculation unit for obtaining actual active power P of the network side g And according to the actual active power P g And a preset given active power P ref Calculating an active amplitude difference value, which is used for 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, and obtaining a per unit model value U of alternating voltage at the net side 0 According to per unit modulus U 0 And calculating the net side output voltage vector amplitude U by the net side amplitude increment m ；
A network side vector angle calculation unit for obtaining actual reactive power Q of the network side 0 And according to the actual reactive power Q 0 And preset given reactive power Q ref Calculating an angular velocity increment and for obtaining a nominal angular velocity omega 1 According to the nominal angular velocity omega 1 And calculating a grid-side output voltage vector angle theta by the angular velocity increment;
a net side modulation wave generating unit for generating a net side output voltage vector angle theta and a net side output voltage vector amplitude U m Space vector change is carried out to obtain a network side three-phase modulation wave V ref_AR 、V ref_BR 、V ref_CR And according to the three-phase modulation wave V on the net side ref_AR 、V ref_BR 、V ref_CR Adjusting the operation of the grid side of the diode uncontrolled rectifier;
the fan side component calculation unit is used for obtaining an actual voltage value U of the fan side direct current bus sdc Actual active current value I s1d And an actual reactive current value I s1q And according to the actual voltage value U sdc Preset rated voltage value U sdc_ref Actual reactive current value I s1q And an actual active current value I s1d Calculating the D-axis component and based on the actual reactive current value I s1q Actual active current value I s1d And presetReactive current setpoint I qref Calculating 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 fan side three-phase modulation wave V ref_AL 、V ref_BL 、V ref_CL And according to the three-phase modulation wave V at the fan side ref_AL 、V ref_BL 、V ref_CL The adjustment diode does not control the operation of the rectifier fan side.
Referring to fig. 2, when the actual active power P on the grid side g When the fluctuation occurs, the power will be equal to the given active power P ref And generating a deviation, and outputting an active amplitude value difference value after the deviation passes through the first PI adjusting unit, wherein the active amplitude value difference value needs to be corrected at the moment. In the correction process, based on the virtual rotational inertia J and the virtual damping coefficient D, the integral and feedback operation are respectively carried out, so that the amplitude increment of the network side can be obtained, and the amplitude increment of the network side passes through the per unit module value U of the alternating voltage of the network side 0 Adding to obtain the final net side output voltage vector amplitude U m . By means of the vector amplitude U of the output voltage at the network side m The adjustment of the active power output on the grid side can be accomplished.
Referring to fig. 2, when the actual reactive power Q at the grid side 0 When the fluctuation occurs, the reactive power Q is equal to the given reactive power Q ref Generating a deviation, which is controlled by hysteresis dead zone and is related to a proportionality coefficient K q After multiplication of (a) an angular velocity increase is obtained by a multiplication with the nominal angular velocity omega 0 And further calculation is carried out, so that the vector angle theta of the grid-side output voltage can be obtained. The reactive power output on the grid side can be adjusted by using the vector angle theta of the output voltage on the grid side.
Referring to fig. 2, in order to complete the control of the three-phase fully-controlled converter on the grid side of fig. 1, it is necessary to set the grid side output voltage vector angle θ and the grid side output voltage vector magnitude U m Space vector change is carried out to obtain a network side three-phase modulation wave V ref_AR 、V ref_BR 、V ref_CR The three-phase modulation wave V on the net side can be used ref_AR 、V ref_BR 、V ref_CR And adjusting the operation of the three-phase full-control converter at the power grid side.
Fig. 3 shows a control strategy of a three-phase fully controlled converter on the wind turbine side. Acquiring an actual voltage value U of a fan-side direct current bus sdc Actual active current value I s1d And an actual reactive current value I s1q Then, according to the actual voltage value U sdc Rated voltage value U sdc_ref And an actual active current value I s1d The D-axis component is calculated and can be simultaneously calculated according to the actual reactive current value I s1q And a preset reactive current setpoint I qref The Q-axis component is calculated. Then, the D axis component and the Q axis component are subjected to inverse DQ vector change to obtain a fan side three-phase modulation wave V ref_AL 、V ref_BL 、V ref_CL By using three-phase modulation wave V at fan side ref_AL 、V ref_BL 、V ref_CL And adjusting the operation of the three-phase full-control converter at 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 vector amplitude of the grid-side output voltage, the reactive power output of the wind driven generator 110 to the offshore power grid is changed through the vector angle of the grid-side output voltage, and compared with a traditional control mode, the diode uncontrolled rectifier control system can ensure effective power interaction between the wind driven generator 110 and the offshore wind farm power grid, and is particularly suitable for an offshore direct current transmission system based on diode uncontrolled rectification. In addition, by utilizing the virtual inertia control principle, the rapid change of the frequency of the power grid can be effectively restrained.
According to an embodiment of the third aspect of the invention, a computer-readable storage medium stores computer-executable instructions for causing a computer to execute the diode-uncontrolled rectifier control method described above.
According to the computer-readable storage medium of the embodiment of the invention, storage and transfer of computer-executable instructions can be facilitated by the storage medium.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means 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, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. 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 appreciate that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (4)
1. A method for controlling a diode-uncontrolled rectifier, comprising the steps of:
calculating the vector amplitude of the output voltage at the network side: acquiring 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, the preset virtual moment of inertia and the preset virtual damping coefficient; acquiring a per unit module value of alternating voltage at a power grid side, and calculating a vector amplitude of output voltage at the grid side according to the per unit module value and the amplitude increment at the grid side;
calculating a vector angle of the output voltage at the network side: 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 at the grid side according to the rated angular velocity and the angular velocity increment;
performing 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 V ref_AR 、V ref_BR 、V ref_CR And according to the three-phase modulation wave V at the net side ref_AR 、V ref_BR 、V ref_CR Adjusting the operation of the grid side of the diode uncontrolled rectifier;
acquiring an actual voltage value, an actual active current value and an actual reactive current value of a direct current bus at a 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; the D axis component and the Q axis component are subjected to inverse DQ vector change to obtain a fan-side three-phase modulation wave V ref_AL 、V ref_BL 、V ref_CL And according to the three-phase modulation wave V on the fan side ref_AL 、V ref_BL 、V ref_CL Adjusting the operation of the diode-uncontrolled rectifier on the fan side;
the step of calculating the difference value of the active power amplitude according to the actual active power and the preset given active power comprises the following steps:
performing addition operation on the actual active power and the given active power to obtain an active power difference value;
inputting the active power difference value into a first PI regulating unit to obtain the active amplitude difference value,
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 difference value of the active amplitude 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; wherein the feedback component is obtained according to the net side amplitude increment and a preset virtual damping coefficient,
the calculating the angular speed increment according to the actual reactive power and the preset given reactive power comprises the following steps:
subtracting the actual reactive power from the given reactive power to obtain a second intermediate adjustment value;
performing hysteresis dead zone control on the second intermediate adjustment value to obtain a third intermediate adjustment value;
multiplying the third intermediate adjustment value by a preset scaling factor to obtain the angular velocity increment,
the nominal angular velocity obtaining method comprises the following steps:
acquiring a phase calibration trigger signal, wherein the phase calibration trigger signal is obtained by converting a wireless synchronous signal by a synchronous signal receiving module, and the wireless synchronous signal is transmitted to the synchronous signal receiving module by at least one of Beidou, GPS, galileo, GLONASS and GNSS/Loran-C;
determining the nominal angular velocity from the phase calibration trigger signal,
the calculation of the vector angle of the output voltage at the grid side according to the rated angular velocity and the angular velocity increment comprises the following steps:
performing addition operation on the rated angular velocity and the angular velocity increment to obtain an adjusted angular velocity;
and carrying out integral operation on the adjustment angular velocity to obtain the vector angle of the grid-side output voltage.
2. The method according to claim 1, wherein the spatial vector change is performed 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 modulated wave V ref_AR 、V ref_BR 、V ref_CR Comprising the following steps:
carrying out coordinate change on the vector angle of the grid-side output voltage and the vector amplitude of the grid-side output voltage to obtain a first modulation parameter and a second modulation parameter;
2/3 transforming the first modulation parameter and the second modulation parameter to obtain the network side three-phase modulation wave V ref_AR 、V reg_BR 、V ref_CR 。
3. A diode-uncontrolled rectifier control system, comprising:
the network side amplitude calculation unit is used for obtaining actual active power of the power grid side, calculating an active amplitude difference value according to the actual active power and preset given active power, calculating a network side amplitude increment according to the active amplitude difference value, preset virtual moment of inertia and preset virtual damping coefficient, obtaining a per unit module value of alternating voltage of the power grid side, and calculating a network side output voltage vector amplitude according to the per unit module value and the network side amplitude increment;
the network side vector angle calculation unit is used for obtaining actual reactive power of a power grid side, calculating an angular speed increment according to the actual reactive power and preset given reactive power, obtaining a rated angular speed, and calculating a network side output voltage vector angle according to the rated angular speed and the angular speed increment;
a grid-side modulation wave generating unit for performing space vector change 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 V ref_AR 、V ref_BR 、V ref_CR And according to the three-phase modulation wave V at the net side ref_AR 、V ref_BR 、V ref_CR Adjusting the operation of the grid side of the diode uncontrolled rectifier;
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 V ref_AL 、V ref_BL 、V ref_CL And according to the three-phase modulation wave V on the fan side ref_AL 、V ref_BL 、V ref_CL Adjusting the diodeThe operation of the rectifier fan side is not controlled.
4. A computer-readable storage medium, characterized by: the computer-readable storage medium stores computer-executable instructions for causing a computer to execute the diode-uncontrolled rectifier control method according to any one of claims 1 to 2.
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