CN112165125B - Inertia anti-droop control method and system - Google Patents
Inertia anti-droop control method and system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/106—Parallel operation of dc sources for load balancing, symmetrisation, or sharing
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
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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
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention discloses an inertia anti-droop control method and system, wherein an anti-droop direct current voltage instruction is determined according to an active power instruction and an anti-droop parameter set by taking the constant voltage of a public direct current bus as a target, two active power and direct current voltage are controlled simultaneously, the anti-droop direct current voltage instruction is increased when the active power instruction is increased, lifting control is realized, inertia control is introduced to realize anti-droop, the balance maintenance of the transient power of each station is realized, the constant voltage of the public direct current bus, real-time N-X operation, seamless grid connection/disconnection of any station, transient power inertia response, independent starting and control of a single station, main control of each station, strong capability of receiving impact load/power supply and the like can be realized.
Description
Technical Field
The invention relates to an inertia anti-droop control method and system, in particular to an inertia anti-droop control method for each converter or converter station in a low-voltage direct-current system in a homogeneous mode, and belongs to the field of power electronics.
Background
Under the scenes of flexible direct-current transmission, a multi-terminal direct-current distribution network, a low-voltage direct-current distribution network and the like, a master-slave control algorithm is usually adopted, namely one converter/converter station (hereinafter referred to as a master station) is responsible for stabilizing direct-current voltage, and other converter/converter stations (hereinafter referred to as slave stations) operate in a PQ mode (current source), namely the converter/converter station comprises a master control voltage source and a plurality of controllable current sources (slave control units), and the stability of the whole system depends on the working reliability of the master station.
The master-slave mode control method is simple and easy to realize, but has the following problems:
1) The direct-current voltage at the outlet of the master station is constant, the voltage at the outlets of other slave stations fluctuates, and the constant direct-current voltage at the public sides such as a public bus cannot be realized;
2) The transient direct current power is completely balanced by the main station, and the capability of bearing impact load/power supply is weak;
3) The system is not easy to expand, slave stations can be undisturbed and merged into the system, but other master stations adopting direct-current voltage control cannot be undisturbed and merged into the system;
4) The N-X fault has poor operation characteristics, and the system is broken down after the main station fails;
5) And after the active command distributed by each station is updated, the real-time active power of each station responds according to a step or a slope.
Disclosure of Invention
The invention provides an inertia anti-droop control method and system, and solves the problems disclosed in the background technology.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an inertia anti-droop control method comprises the following steps,
acquiring an active power instruction distributed to each converter by a direct-current secondary voltage regulating side and the currently output active power of each converter;
calculating the active power regulating quantity of each converter according to the active power instruction and the currently output active power;
calculating the product of the active power regulating quantity of each converter and the corresponding preset inverse droop parameter; the anti-droop parameter setting aims at the constant voltage of the common direct current bus;
and taking the product as the input of inertia control to obtain the reverse down vertical current voltage instruction of each converter, and performing system cooperative control.
And acquiring an active power instruction distributed to each converter by the direct current secondary voltage regulating side according to the active power output proportion and the active power currently output by each converter.
Active power adjustment = active power command assigned to the converter-the active power currently output by the converter.
The procedure for presetting the anti-droop parameter is that,
determining a common direct current bus connection point according to a preset judgment rule by taking the constant voltage of the common direct current bus as a target;
and determining the anti-droop parameter according to the line resistance between the converter and the common direct current bus connection point.
The judgment rule is that the direct current side voltage of the converter has a linear relation with the direct current exchange power and the line resistance thereof.
The formula of the anti-droop parameter is as follows,
wherein, K up For anti-droop parameters, U dc_pcc Is a common DC bus voltage, R n The line resistance is the line resistance between the converter and the common DC bus connection point.
An inertia anti-droop control system comprises a first damping device,
an acquisition module: obtaining an active power instruction distributed to each converter by a direct current secondary voltage regulating side and active power currently output by each converter;
an adjustment quantity module: calculating the active power regulating quantity of each converter according to the active power instruction and the currently output active power;
a product module: calculating the product of the active power regulating quantity of each converter and the corresponding preset inverse droop parameter; the method comprises the following steps that a common direct-current bus voltage is set as a target for reverse droop parameter setting;
an inertia amount control module: and taking the product as the input of inertia control to obtain the reverse down-vertical current voltage instruction of each converter, and performing system cooperative control.
Also comprises a preset reverse droop parameter module which comprises,
a connection point confirmation module: determining a common direct current bus connection point according to a preset judgment rule by taking the constant voltage of the common direct current bus as a target;
an anti-droop parameter module: and determining an anti-droop parameter according to the line resistance between the converter and the common direct current bus connection point.
A computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform an anti-inertia droop control method.
A computing device comprising one or more processors, one or more memories, and one or more programs stored in the one or more memories and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing an inertia anti-droop control method.
The invention achieves the following beneficial effects: the anti-droop direct current voltage instruction is determined according to an active power instruction and an anti-droop parameter set by taking the constant voltage of a public direct current bus as a target, two active power and direct current voltage are controlled simultaneously, the anti-droop direct current voltage instruction is increased when the active power instruction is increased, lifting control is realized, meanwhile, inertia control is introduced to realize anti-droop, the constant voltage of the public direct current bus, real-time N-X operation, seamless grid connection/grid disconnection of any station, transient power inertia response, single-station independent starting and control, main control of each station, strong capability of impacted load/power supply and the like can be realized; the method comprises the following specific steps:
1) The anti-droop direct current voltage instruction is determined according to the active power instruction and an anti-droop parameter set by taking the voltage constancy of the common direct current bus as a target, so that the voltage constancy of the common direct current bus can be realized;
2) All the converters adopt the same control method, all the converters are master stations and have strong capability of bearing impact load/power supply;
3) The converter controls the active power and the direct current voltage simultaneously to carry out grid connection, and undisturbed direct current grid connection/exit of each station can be realized;
4) The converter has a direct-current voltage control function, can realize independent starting of a single station, is a master station, and realizes N-X fault operation without influencing system operation maintenance due to faults of any station;
5) When the distribution instruction of each station changes, due to the existence of inertia control, the active response of each station realizes gentle slope buffering, the inertia link better realizes the additional planning in the control process of anti-sag, and the primary voltage regulation stability of each converter and the real-time power balance of the converter interconnection system when the transient power changes are realized.
Drawings
FIG. 1 is a block diagram of the process of the present invention;
FIG. 2 is a diagram of a DC interconnect system;
FIG. 3 is a schematic diagram of an active power flow of a DC system;
FIG. 4 is a schematic diagram of DC voltage-active reverse droop of a DC system;
FIG. 5 is a block diagram of a dual-sequence anti-droop controller;
FIG. 6 is a schematic diagram of DC voltage ramp control;
FIG. 7 is a waveform diagram of an inertia reverse droop station or a single-station independent starting transient state of a converter;
FIG. 8 (a) is a diagram of the DC voltage sag test current waveform during active power increase;
FIG. 8 (b) is a graph of DC voltage sag test voltage waveforms with active power increase;
FIG. 9 is a waveform diagram of transient characteristics of any of the inertia droop stations or converters incorporated in the DC system;
FIG. 10 is a waveform diagram of the transient characteristics of any of the inertia droop stations or converters exiting the DC system;
fig. 11 is a power command variation transient ramp characteristic diagram.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, an inertia anti-droop control method includes the following steps:
In the figure, the nth converter is taken as an example, and the active power command distributed to the nth converter is obtained
And the currently output active power P n 。
And 2, calculating the active power regulating quantity of each converter according to the active power instruction and the currently output active power.
Active power adjustment = active power command assigned to the converter-the active power currently output by the converter. Taking the nth converter as an example in the figure, the active power regulating quantity is
Step 3, calculating the active power regulating quantity of each converter and corresponding preset droop parameter K up Product of (i) i.e.
The anti-droop parameter is set by taking the voltage of the common direct current bus as a target, and is related to the line resistance between the converter and the connection point of the common direct current bus, and further related to the position of the connection point of the common direct current bus, so that the connection point needs to be determined before inertia anti-droop control.
In the dc interconnection system shown in fig. 2, the ratio of resistance to reactance in the interconnection lines of the system is large, so that the dc sides of the converters are mainly connected in a resistive manner, and typical dc line parameters are shown in table 1.
TABLE 1 typical DC line parameters
| Line type | R′/(Ω/km) | X′/(Ω/km) | IN/A | R′/X′ |
| Low-voltage direct-current circuit | 0.642 | 0.083 | 142 | 7.7 |
As shown in fig. 3 and 4, the dc outlets of the converters are connected to a common dc bus via lines, the common dc bus voltage U dc_pcc The dc-side voltage of the converter, i.e. the dc outlet voltage U dcn Line resistance R n Active power P of output n Can be calculated by the following formula:
the above equation shows that in the system, the active power flow is related to the dc voltage. When U is turned dcn When lifted, I dcn Increase of P n And increasing the output active power of the converter and the voltage of the direct current outlet to have the anti-droop characteristic.
Using a given active power P n (power distribution or regulation to stations by communication) and common DC bus voltage U dc_pcc Rearranging the above formula to obtain the DC outlet voltage U of the converter dcn ：
To simplify the above equation, it is assumed that the converter injects P 'as the active power of the common dc bus, i.e., the dc switching power' n The method comprises the following steps:
P′ n ＝U dc_pcc I dcn
DC outlet voltage U of converter dcn ：
U dcn ＝R n ·I dcn +U dc_pcc
The following components can be obtained in a simultaneous manner:
recording line piezoresistive coefficient
Then:
U dcn ＝β n ·P n ′+U dc_pcc
from the above formula, under the condition that the voltage of the common direct current bus is constant, the direct current side voltage of the converter is in a linear relation with the direct current exchange power and the line resistance of the converter; thus, the direct-current side voltage of the converter and the direct-current exchange power thereof are controlled to present beta n And the constant voltage of the common direct current bus can be realized by changing the proportionality coefficient.
In summary, the process of presetting the anti-droop parameter is as follows:
1) The method comprises the steps of determining a common direct current bus connection point according to a preset judgment rule by taking the constant voltage of a common direct current bus as a target; wherein the judgment rule is as follows: the direct-current side voltage of the converter has a linear relation with the direct-current exchange power and the line resistance thereof.
2) And determining an anti-droop parameter according to the line resistance between the converter and the common direct current bus connection point.
The formula of the anti-sagging parameter is as follows:
wherein, K up For the anti-droop parameter, U dc_pcc Is the common DC bus voltage, R n The line resistance is the line resistance between the converter and the common DC bus connection point.
And 4, taking the product as the input of inertia control to obtain the reverse down vertical current voltage instruction of each converter, and performing system cooperative control.
As shown in fig. 5, a 3-active loop nested structure is adopted in the entire cooperative control: inertia anti-droop control ring + direct current voltage ring + current ring. In the system, each converter is used as a host machine and is controlled by adopting the method.
In the inertia anti-droop control loop, namely the method (a dotted line part in the figure), the converter can simultaneously control the active power and the direct-current voltage, the direct-current voltage instruction of the direct-current voltage loop is increased when the active power instruction is increased, so that the lifting control is realized, meanwhile, inertia control is introduced to realize an anti-droop algorithm (instability problems such as transient imbalance among machines and the like are avoided), and the balance maintenance of the respective transient power of each station is realized. The inertia anti-droop control method balances the power balance deviation between active power and direct-current voltage and the control deviation of each converter so as to adapt to the multi-terminal system stability problem under power transient fluctuation.
The current loop adopts a dual-controller structure, adopts a wave trap to respectively extract positive and negative sequence components of grid voltage and grid-connected current, and respectively adjusts the positive and negative sequence currents. When the power grid is unbalanced, in order to restrain the alternating current instantaneous power and 2 times of pulsation in direct current voltage, the relationship between the negative sequence current instruction and the positive sequence current instruction is as follows:
in the formula, the subscript "_ P" represents a positive sequence component; the subscript "_ N" represents the negative sequence component; e.g. of the type d 、e q D and q axis components of the grid voltage respectively;
corresponding to the active and reactive currents, respectively.
The main functions of the three closed loops are as follows:
1) Inertia anti-droop control loop: and tracking the distributed active power instruction, obtaining a direct current voltage instruction, and regulating the steady-state output of the converter under a slow time scale.
2) D, direct current voltage loop: and the voltage of the direct current outlet is regulated to obtain an active current instruction, and each converter can jointly stabilize transient voltage fluctuation caused by switching on/off of the impact load under a fast time scale through a direct current voltage loop.
3) Current inner loop: and tracking the positive and negative sequence current commands in real time.
As shown in fig. 6, the three-closed-loop operation mechanism under the actual transient condition is analyzed, and when a load is put on the dc side, the system operation point is changed from point x to point a', the nth converter outputs P1 under the natural voltage-power balance, the dc voltage drops, and the converter is changed to the state a under the action of the dc voltage loop and the current inner loop. And if the active power instruction of the converter is P2 according to the power distribution strategy when the load is put into operation, the converter regulates the gentle slope to the point c under the action of the inertia anti-droop control loop.
Taking a 3-port direct-current interconnected distribution network as an example, each converter adopts the inertia anti-droop control method, and as can be seen from fig. 7, the converter has a direct-current voltage control function and can realize independent starting of a single station. As can be seen from fig. 8 (a) and 8 (b), the dc side outlet voltage of each station rises with the increase of the active power thereof, and the anti-droop control is realized. As can be seen from fig. 9 and 10, the converter simultaneously controls the active power and the dc voltage to perform grid connection and grid disconnection, and thus undisturbed dc grid connection and disconnection of each station can be realized. As can be seen from fig. 11, when the distribution instruction of each station changes, the active response of each station realizes the gentle slope buffering, the inertia link better realizes the additional planning in the control process of the anti-droop, and the primary voltage regulation stability of each converter and the real-time power balance of the converter interconnection system when the transient power changes are realized.
In summary, the above method is compared with the conventional master-slave control method, and the ratio is shown in table 2:
TABLE 2 comparison of advantages table
The method can realize that each converter is the main station for controlling the direct-current voltage, and improves the overall reliability and control robustness of the power electronic system. The method can realize constant voltage of the public direct current bus, real-time N-X operation, seamless grid connection/disconnection of any station, transient power inertia response, independent starting and control of a single station, main control of each station, strong capacity of impacted load/power supply and the like.
An inertia anti-droop control system comprises a first damping device,
an acquisition module: obtaining an active power instruction distributed to each converter by a direct current secondary voltage regulating side and active power currently output by each converter;
a regulating quantity module: calculating the active power regulating quantity of each converter according to the active power instruction and the currently output active power;
a product module: calculating the product of the active power regulating quantity of each converter and the corresponding preset inverse droop parameter;
an inertia amount control module: and taking the product as the input of inertia control to obtain the reverse down-vertical current voltage instruction of each converter, and performing system cooperative control.
The preset anti-droop parameter module comprises,
a connection point confirmation module: determining a common direct current bus connection point according to a preset judgment rule by taking the constant voltage of the common direct current bus as a target;
an anti-droop parameter module: and determining the anti-droop parameter according to the line resistance between the converter and the common direct current bus connection point.
A computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform an anti-inertia droop control method.
A computing device comprising one or more processors, one or more memories, and one or more programs stored in the one or more memories and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing an inertia anti-droop control method.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The present invention is not limited to the above embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention are included in the scope of the claims of the present invention as filed.
Claims (6)
1. An inertia anti-droop control method is characterized by comprising the following steps: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
acquiring an active power instruction distributed to each converter by a direct current secondary voltage regulating side according to the active power output proportion and the active power currently output by each converter;
calculating the active power regulating quantity of each converter according to the active power instruction and the currently output active power;
calculating the product of the active power regulating quantity of each converter and the corresponding preset droop parameter; the anti-droop parameter setting aims at the constant voltage of the common direct current bus; the process of presetting the anti-droop parameter is as follows: the method comprises the steps of determining a common direct current bus connection point according to a preset judgment rule by taking the constant voltage of a common direct current bus as a target; determining an anti-droop parameter according to a line resistance between a converter and a common direct current bus connection point; the formula of the anti-sagging parameter is as follows,
wherein, K up For anti-droop parameters, U dc_pcc Is the common DC bus voltage, R n The line resistance is the line resistance between the converter and the common direct current bus connection point;
taking the product as the input of inertia control to obtain the reverse down vertical current voltage instruction of each converter, and performing system cooperative control;
the system cooperative control also comprises a direct current voltage loop and a current loop;
d, direct current voltage loop: regulating the voltage of a direct current outlet to obtain an active current instruction, and jointly stabilizing transient voltage fluctuation caused by the switching on/off of the impact load by each converter through a direct current voltage loop;
current loop: respectively extracting positive and negative sequence components of grid voltage and grid-connected current by adopting a wave trap, and respectively adjusting the positive and negative sequence currents; when the power grid is unbalanced, the relationship between the negative sequence current instruction and the positive sequence current instruction is as follows:
in the formula, the subscript "_ P" represents a positive sequence component; the subscript "_ N" represents the negative sequence component; e.g. of the type d 、e q D and q axis components of the grid voltage respectively;
corresponding to active and reactive currents, respectively.
2. The inertia anti-droop control method of claim 1, wherein: active power adjustment = active power command assigned to the converter-the active power currently output by the converter.
3. The inertia anti-droop control method of claim 1, wherein: the judgment rule is that the direct current side voltage of the converter has a linear relation with the direct current exchange power and the line resistance thereof.
4. An inertia anti-droop control system, comprising: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
an acquisition module: acquiring an active power instruction distributed to each converter by a direct current secondary voltage regulating side according to the active power output proportion and the active power currently output by each converter;
an adjustment quantity module: calculating the active power regulating quantity of each converter according to the active power instruction and the currently output active power;
a product module: calculating the product of the active power regulating quantity of each converter and the corresponding preset inverse droop parameter; the anti-droop parameter setting aims at the constant voltage of the common direct current bus;
the preset reverse droop parameter module comprises a preset reverse droop parameter module,
a connection point confirmation module: the method comprises the steps of determining a common direct current bus connection point according to a preset judgment rule by taking the constant voltage of a common direct current bus as a target;
the anti-droop parameter module: determining an anti-droop parameter according to the line resistance between the converter and the common direct current bus connection point, wherein the anti-droop parameter has a formula,
wherein, K up For the anti-droop parameter, U dc_pcc Is a common DC bus voltage, R n The line resistance is the line resistance between the converter and the common direct current bus connection point;
an inertia amount control module: taking the product as the input of inertia control to obtain the reverse down vertical current voltage instruction of each converter, and performing system cooperative control;
the system cooperative control also comprises a direct current voltage loop and a current loop;
d, direct current voltage loop: regulating the voltage of a direct current outlet to obtain an active current instruction, and jointly stabilizing transient voltage fluctuation caused by switching on/off of the impact load by each converter through a direct current voltage loop;
current loop: respectively extracting positive and negative sequence components of grid voltage and grid-connected current by adopting a wave trap, and respectively adjusting the positive and negative sequence currents; when the power grid is unbalanced, the relationship between the negative sequence current instruction and the positive sequence current instruction is as follows:
in the formula, the subscript "_ P" represents a positive sequence component; the subscript "_ N" represents the negative sequence component; e.g. of a cylinder d 、e q D and q axis components of the grid voltage respectively;
corresponding to active and reactive currents, respectively.
5. A computer readable storage medium storing one or more programs, wherein: the one or more programs include instructions that, when executed by a computing device, cause the computing device to perform any of the methods of claims 1-3.
6. A computing device, characterized by: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
one or more processors, one or more memories, and one or more programs stored in the one or more memories and configured to be executed by the one or more processors, the one or more programs including instructions for performing any of the methods of claims 1-3.
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