CN113872230B - New energy fault ride-through control parameter optimization method and device - Google Patents
New energy fault ride-through control parameter optimization method and device 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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—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
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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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- 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
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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]
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Abstract
The invention relates to the technical field of new energy fault ride-through, and particularly provides a new energy fault ride-through control parameter optimization method and device, comprising the following steps: in a simulation environment under the condition that new energy is connected into a direct current fault of an extra-high voltage direct current transmission end power grid, reactive current, active current and active power of new energy equipment are regulated by using a new energy fault ride-through control model, and the active current of the new energy equipment is regulated to be recovered in a fixed slope mode after the fault is cleared; and adjusting parameters to be optimized in a new energy fault ride-through control model and the recovery slope in the fixed slope mode by taking the minimum transient overvoltage of the new energy machine end in the near-region of the extra-high voltage direct current transmission end in the simulation environment of the extra-high voltage direct current transmission end power grid as a target, and obtaining the optimal parameters to be optimized and the optimal recovery slope. According to the technical scheme provided by the invention, the key parameters influencing the transient overvoltage are optimized, so that the transient overvoltage pressure is relieved, and the safe operation level of the power grid is improved.
Description
Technical Field
The invention relates to the field of new energy fault ride-through, in particular to a new energy fault ride-through control parameter optimization method and device.
Background
In recent years, new energy rapidly develops, and the new energy ratio is gradually increased year by virtue of the unique illumination and wind resources in northwest regions, so that a pattern that large-scale new energy is accessed to a near-area of an extra-high voltage direct current transmission end is gradually formed. According to the relevant simulation analysis of the power grid with the large-scale new energy access direct current end, the problem of transient overvoltage exists in the direct current fault process, and the large-scale off-grid of the new energy can be caused, so that the safe and stable operation of the power grid is affected.
Faults such as restarting, locking, commutation failure and the like of the extra-high voltage direct current can cause transient overvoltage in a near-end area of the transmitting end. Taking commutation failure as an example, after the failure occurs, the direct current rises rapidly, and a convertor station absorbs a large amount of reactive power from a power grid to cause low voltage at a transmitting end; and then the direct current is regulated to 0 under the action of a control system, and a large amount of reactive power is injected into a reverse power grid of the converter station, so that overvoltage is caused. In the voltage change process, when the voltage of the power grid is lower than a threshold value (most 0.9 p.u.), the new energy enters low-voltage ride through control, and active current is reduced and reactive current is increased during the period. When the power grid is changed from low voltage to overvoltage, the full-converter type new energy unit such as direct drive, photovoltaic and the like is influenced by voltage measurement, control delay and the like, and the change of active power and reactive power lags by more than 20ms, so that the new energy still generates reactive power during the overvoltage period, and the phenomenon that the overvoltage of the end of the new energy station is higher than that of the converter station is caused.
Disclosure of Invention
In order to overcome the defects, the invention provides a new energy fault ride-through control parameter optimization method and device.
In a first aspect, a new energy failure crossing control parameter optimization method is provided, and the new energy failure crossing control parameter optimization method includes:
in a simulation environment under the condition that new energy is connected into a direct current fault of an extra-high voltage direct current transmission end power grid, reactive current, active current and active power of new energy equipment are regulated by using a new energy fault ride-through control model, and the active current of the new energy equipment is regulated to be recovered in a fixed slope mode after the fault is cleared;
and adjusting parameters to be optimized in a new energy fault ride-through control model and the recovery slope in the fixed slope mode by taking the minimum transient overvoltage of the new energy machine end in the near-region of the extra-high voltage direct current transmission end in the simulation environment of the extra-high voltage direct current transmission end power grid as a target, and obtaining the optimal parameters to be optimized and the optimal recovery slope.
Preferably, the dc fault condition includes at least one of: multiple commutation failure faults and direct current blocking faults.
Preferably, the adjusting reactive current, active current and active power of the new energy device by using the new energy fault ride through control model includes:
when the voltage of the machine end of the new energy equipment is lower than a threshold value for entering low voltage ride through, the reactive current and the active current of the new energy equipment are regulated by using a new energy fault ride through control model during the low voltage ride through;
when the voltage of the machine end of the new energy equipment is higher than the threshold value for entering the high voltage ride through, the reactive current and the active power of the new energy equipment are regulated by utilizing the new energy fault ride through control model during the high voltage ride through.
Further, the calculation formula of the new energy fault ride-through control model during the low voltage ride-through period is as follows:
in the above, iq LVRT Is reactive current in low voltage ride through period, vt is the voltage of the new energy machine terminal, VL in To enter the threshold of low voltage ride through, iq 0 Reactive current, K of new energy equipment before low voltage ride through 1_Iq_LV 、K 2_Iq_LV 、Iq set_LV The first reactive current control coefficient, the second reactive current control coefficient and the third reactive current control coefficient are respectively low voltage ride-through, ip LVRT Is the active current during low voltage ride through, ip 0 Active power K of new energy equipment before low voltage ride through 1_Ip_LV 、K 2_Ip_LV 、Ip set_LV The first, second and third control coefficients of the low voltage ride through active current are respectively.
Further, the calculation formula of the new energy fault ride-through control model during the high voltage ride-through period is as follows:
in the above, iq HVRT Is reactive current in the high voltage crossing period, vt is the voltage of the new energy machine end, VH in To enter the threshold of high voltage ride through, iq 00 Reactive current, K of new energy equipment before high voltage ride through 1_Iq_HV 、K 2_Iq_HV 、Iq set_HV The control coefficients of the reactive current of the first, the second and the third voltage crossing are respectively, P HVRT Active power, P, for equipment during high voltage ride through 0 Active power K of new energy equipment before high voltage ride through P_HVRT 、P set_HV The first active power control coefficient and the second active power control coefficient are respectively crossed by high voltage.
Further, the threshold for entering low voltage crossing is 0.9p.u., and the threshold for entering high voltage crossing is 1.1p.u.
Preferably, when the voltage of the machine side of the new energy equipment is higher than the threshold value of entering the low voltage crossing and lower than the threshold value of entering the high voltage crossing, the fault is cleared.
Further, the parameters to be optimized include at least one of the following: the low voltage ride through first, second, third reactive current control coefficients, the low voltage ride through active current first, second, third control coefficients, the high voltage ride through first, second, third reactive current control coefficients, the high voltage ride through first, second active power control coefficients.
In a second aspect, a new energy failure crossing control parameter optimizing apparatus is provided, the new energy failure crossing control parameter optimizing apparatus includes:
the adjusting module is used for adjusting reactive current, active current and active power of the new energy equipment by utilizing the new energy fault ride-through control model in a simulation environment under the condition that the new energy is connected into the ultra-high voltage direct current transmission end power grid direct current fault, and adjusting the active current of the new energy equipment to recover according to a fixed slope mode after the fault is cleared;
the acquisition module is used for adjusting the parameters to be optimized in the new energy fault ride-through control model and the recovery slope in the fixed slope mode to acquire the optimal parameters to be optimized and the optimal recovery slope by taking the minimum transient overvoltage of the near-zone new energy machine end of the extra-high voltage direct current transmission end in the simulation environment of the new energy access extra-high voltage direct current transmission end power grid as a target.
In a third aspect, a storage device is provided, in which a plurality of program codes are stored, the program codes being adapted to be loaded and executed by a processor to perform the new energy failure crossing control parameter optimization method according to any one of the above-mentioned technical solutions.
In a fourth aspect, a control device is provided, where the control device includes a processor and a storage device, where the storage device is adapted to store a plurality of program codes, where the program codes are adapted to be loaded and executed by the processor to perform the new energy failure crossing control parameter optimization method according to any one of the above aspects.
The technical scheme provided by the invention has at least one or more of the following beneficial effects:
the invention provides a new energy fault ride-through control parameter optimization method and device, comprising the following steps: in a simulation environment under the condition that new energy is connected into a direct current fault of an extra-high voltage direct current transmission end power grid, reactive current, active current and active power of new energy equipment are regulated by using a new energy fault ride-through control model, and the active current of the new energy equipment is regulated to be recovered in a fixed slope mode after the fault is cleared; and adjusting parameters to be optimized in a new energy fault ride-through control model and the recovery slope in the fixed slope mode by taking the minimum transient overvoltage of the new energy machine end in the near-region of the extra-high voltage direct current transmission end in the simulation environment of the extra-high voltage direct current transmission end power grid as a target, and obtaining the optimal parameters to be optimized and the optimal recovery slope. The technical scheme provided by the invention can reduce reactive reverse regulation of new energy during direct current faults, and improve active output during low wear and reactive absorption level during high wear, so that transient overvoltage is reduced.
Drawings
FIG. 1 is a schematic flow chart of main steps of a new energy fault ride-through control parameter optimization method according to an embodiment of the present invention;
fig. 2 is a main structural block diagram of the new energy fault ride-through control parameter optimizing device according to the embodiment of the invention.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic flow chart of main steps of a new energy fault ride through control parameter optimization method according to an embodiment of the present invention. As shown in fig. 1, the method for optimizing the new energy fault ride through control parameters in the embodiment of the invention mainly comprises the following steps:
step S101: in a simulation environment under the condition that new energy is connected into a direct current fault of an extra-high voltage direct current transmission end power grid, reactive current, active current and active power of new energy equipment are regulated by using a new energy fault ride-through control model, and the active current of the new energy equipment is regulated to be recovered in a fixed slope mode after the fault is cleared;
step S102: and adjusting parameters to be optimized in a new energy fault ride-through control model and the recovery slope in the fixed slope mode by taking the minimum transient overvoltage of the new energy machine end in the near-region of the extra-high voltage direct current transmission end in the simulation environment of the extra-high voltage direct current transmission end power grid as a target, and obtaining the optimal parameters to be optimized and the optimal recovery slope.
And when the voltage of the machine end of the new energy equipment is higher than the threshold value for entering the low voltage ride through and lower than the threshold value for entering the high voltage ride through, the fault is cleared.
In this embodiment, the dc fault condition includes at least one of the following: multiple commutation failure faults and direct current blocking faults.
In this embodiment, the adjusting reactive current, active current and active power of the new energy device by using the new energy fault ride through control model includes:
when the voltage of the machine end of the new energy equipment is lower than a threshold value for entering low voltage ride through, the reactive current and the active current of the new energy equipment are regulated by using a new energy fault ride through control model during the low voltage ride through;
when the voltage of the machine end of the new energy equipment is higher than the threshold value for entering the high voltage ride through, the reactive current and the active power of the new energy equipment are regulated by utilizing the new energy fault ride through control model during the high voltage ride through.
In one embodiment, the calculation formula of the new energy fault ride through control model during the low voltage ride through is as follows:
in the above, iq LVRT Is reactive current in low voltage ride through period, vt is the voltage of the new energy machine terminal, VL in To enter the threshold of low voltage ride through, iq 0 Reactive current, K of new energy equipment before low voltage ride through 1_Iq_LV 、K 2_Iq_LV 、Iq set_LV The first reactive current control coefficient, the second reactive current control coefficient and the third reactive current control coefficient are respectively low voltage ride-through, ip LVRT Is the active current during low voltage ride through, ip 0 Active power K of new energy equipment before low voltage ride through 1_Ip_LV 、K 2_Ip_LV 、Ip set_LV The first, second and third control coefficients of the low voltage ride through active current are respectively.
In one embodiment, the calculation formula of the new energy fault ride through control model during the high voltage ride through is as follows:
in the above, iq HVRT Is reactive current in the high voltage crossing period, vt is the voltage of the new energy machine end, VH in To enter the threshold of high voltage ride through, iq 00 Reactive current, K of new energy equipment before high voltage ride through 1_Iq_HV 、K 2_Iq_HV 、Iq set_HV The control coefficients of the reactive current of the first, the second and the third voltage crossing are respectively, P HVRT Active power, P, for equipment during high voltage ride through 0 Active power K of new energy equipment before high voltage ride through P_HVRT 、P set_HV The first active power control coefficient and the second active power control coefficient are respectively crossed by high voltage.
The threshold value of the low voltage crossing is 0.9p.u., the threshold value of the high voltage crossing is 1.1p.u., and the parameter to be optimized comprises at least one of the following: the low voltage ride through first, second, third reactive current control coefficients, the low voltage ride through active current first, second, third control coefficients, the high voltage ride through first, second, third reactive current control coefficients, the high voltage ride through first, second active power control coefficients.
In one embodiment, the objective of minimum transient overvoltage of the near-area new energy machine end of the extra-high voltage direct current transmission end in the simulation environment of the extra-high voltage direct current transmission end power grid is to adjust the parameters to be optimized in the new energy fault ride-through control model and the recovery slope in the fixed slope mode to obtain the optimal parameters to be optimized and the optimal recovery slope, and the method can be implemented as follows:
firstly, arranging a power grid operation mode, setting a conventional unit small starting mode and a new energy large starting mode, and setting a direct current mode according to direct current operation requirements; secondly, setting a direct current fault type, including multiple commutation failures, direct current blocking and other faults, and selecting one fault with the most serious transient overvoltage; again, the range of values of the optimization variables is determined as shown in table 1.
TABLE 1 New energy device failure ride through parameter value Range
Carrying out optimization solution, dividing n parameter variables to be optimized into m equal-interval different parameter values according to a value range, dividing each parameter to be optimized into m intervals in a preferable range, combining the preliminary parameters into m n kinds, respectively carrying out transient calculation under all new energy parameter combinations, and comparing optimization targets to obtain a preliminary optimal solution;
according to the preliminary optimal solution result, reducing the n parameter value ranges to be the preliminary optimal solution range, resetting the n parameter value ranges with different parameters at equal intervals, wherein the parameter combination is m-L, carrying out transient calculation under all new energy parameter combinations again, and comparing and optimizing targets to obtain the approximate optimal solution, namely the new energy parameter normalization transformation technical requirement of the extra-high voltage direct current near zone. And finally, determining the transient overvoltage of the new energy equipment under the direct current fault on the basis of obtaining the ultra-high voltage direct current near-area new energy parameter optimization result, and if the transient overvoltage still exceeds delta Umax, reducing the new energy output in the power grid operation mode and solving again. Wherein DeltaUmax is the maximum transient overvoltage allowed by the new energy equipment.
Based on the same inventive concept, the invention also provides a new energy fault ride-through control parameter optimizing device, as shown in fig. 2, the new energy fault ride-through control parameter optimizing device comprises:
the adjusting module is used for adjusting reactive current, active current and active power of the new energy equipment by utilizing the new energy fault ride-through control model in a simulation environment under the condition that the new energy is connected into the ultra-high voltage direct current transmission end power grid direct current fault, and adjusting the active current of the new energy equipment to recover according to a fixed slope mode after the fault is cleared;
the acquisition module is used for adjusting the parameters to be optimized in the new energy fault ride-through control model and the recovery slope in the fixed slope mode to acquire the optimal parameters to be optimized and the optimal recovery slope by taking the minimum transient overvoltage of the near-zone new energy machine end of the extra-high voltage direct current transmission end in the simulation environment of the new energy access extra-high voltage direct current transmission end power grid as a target.
Preferably, the dc fault condition includes at least one of: multiple commutation failure faults and direct current blocking faults.
Preferably, the adjusting reactive current, active current and active power of the new energy device by using the new energy fault ride through control model includes:
when the voltage of the machine end of the new energy equipment is lower than a threshold value for entering low voltage ride through, the reactive current and the active current of the new energy equipment are regulated by using a new energy fault ride through control model during the low voltage ride through;
when the voltage of the machine end of the new energy equipment is higher than the threshold value for entering the high voltage ride through, the reactive current and the active power of the new energy equipment are regulated by utilizing the new energy fault ride through control model during the high voltage ride through.
Further, the calculation formula of the new energy fault ride-through control model during the low voltage ride-through period is as follows:
in the above, iq LVRT Is reactive current in low voltage ride through period, vt is the voltage of the new energy machine terminal, VL in To enter the threshold of low voltage ride through, iq 0 Reactive current, K of new energy equipment before low voltage ride through 1_Iq_LV 、K 2_Iq_LV 、Iq set_LV The first reactive current control coefficient, the second reactive current control coefficient and the third reactive current control coefficient are respectively low voltage ride-through, ip LVRT Is the active current during low voltage ride through, ip 0 Active power K of new energy equipment before low voltage ride through 1_Ip_LV 、K 2_Ip_LV 、Ip set_LV Respectively low voltage ride through active currentFirst, second and third control coefficients.
Further, the calculation formula of the new energy fault ride-through control model during the high voltage ride-through period is as follows:
in the above, iq HVRT Is reactive current in the high voltage crossing period, vt is the voltage of the new energy machine end, VH in To enter the threshold of high voltage ride through, iq 00 Reactive current, K of new energy equipment before high voltage ride through 1_Iq_HV 、K 2_Iq_HV 、Iq set_HV The control coefficients of the reactive current of the first, the second and the third voltage crossing are respectively, P HVRT Active power, P, for equipment during high voltage ride through 0 Active power K of new energy equipment before high voltage ride through P_HVRT 、P set_HV The first active power control coefficient and the second active power control coefficient are respectively crossed by high voltage.
Further, the threshold for entering low voltage crossing is 0.9p.u., and the threshold for entering high voltage crossing is 1.1p.u.
Preferably, when the voltage of the machine side of the new energy equipment is higher than the threshold value of entering the low voltage crossing and lower than the threshold value of entering the high voltage crossing, the fault is cleared.
Further, the parameters to be optimized include at least one of the following: the low voltage ride through first, second, third reactive current control coefficients, the low voltage ride through active current first, second, third control coefficients, the high voltage ride through first, second, third reactive current control coefficients, the high voltage ride through first, second active power control coefficients.
Further, the present invention provides a storage device, in which a plurality of program codes are stored, the program codes are adapted to be loaded and executed by a processor to perform the new energy fault ride-through control parameter optimization method according to any one of the above-mentioned technical solutions.
Further, the present invention provides a control device, which includes a processor and a storage device, where the storage device is adapted to store a plurality of program codes, and the program codes are adapted to be loaded and executed by the processor to perform the new energy failure crossing control parameter optimization method according to any one of the above technical solutions.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention 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 invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (8)
1. The new energy fault ride-through control parameter optimization method is characterized by comprising the following steps of:
in a simulation environment under the condition that new energy is connected into a direct current fault of an extra-high voltage direct current transmission end power grid, reactive current, active current and active power of new energy equipment are regulated by using a new energy fault ride-through control model, and the active current of the new energy equipment is regulated to be recovered in a fixed slope mode after the fault is cleared;
the method comprises the steps of adjusting parameters to be optimized and a recovery slope in a fixed slope mode in a new energy fault ride-through control model to obtain optimal parameters to be optimized and optimal recovery slopes by taking the minimum transient overvoltage of a new energy machine end in a near-region of an extra-high voltage direct current transmission end in a simulation environment of a new energy access extra-high voltage direct current transmission end power grid as a target;
the method for adjusting reactive current, active current and active power of new energy equipment by using the new energy fault ride-through control model comprises the following steps:
when the voltage of the machine end of the new energy equipment is lower than a threshold value for entering low voltage ride through, the reactive current and the active current of the new energy equipment are regulated by using a new energy fault ride through control model during the low voltage ride through;
when the voltage of the machine end of the new energy equipment is higher than a threshold value for entering high voltage ride through, the reactive current and the active power of the new energy equipment are regulated by utilizing a new energy fault ride through control model during the high voltage ride through;
the calculation formula of the new energy fault ride-through control model during the low voltage ride-through period is as follows:
in the above, iq LVRT Is reactive current in low voltage ride through period, vt is the voltage of the new energy machine terminal, VL in To enter the threshold of low voltage ride through, iq 0 Reactive current, K of new energy equipment before low voltage ride through 1_Iq_LV 、K 2_Iq_LV 、Iq set_LV The first reactive current control coefficient, the second reactive current control coefficient and the third reactive current control coefficient are respectively low voltage ride-through, ip LVRT Is the active current during low voltage ride through, ip 0 Active power K of new energy equipment before low voltage ride through 1_Ip_LV 、K 2_Ip_LV 、Ip set_LV The first control coefficient, the second control coefficient and the third control coefficient are respectively the low voltage ride through active current;
the calculation formula of the new energy fault ride-through control model during the high voltage ride-through period is as follows:
in the above, iq HVRT Is reactive current in the high voltage crossing period, vt is the voltage of the new energy machine end, VH in To enter the threshold of high voltage ride through, iq 00 Reactive current, K of new energy equipment before high voltage ride through 1_Iq_HV 、K 2_Iq_HV 、Iq set_HV The control coefficients of the reactive current of the first, the second and the third voltage crossing are respectively, P HVRT Active power, P, for equipment during high voltage ride through 0 Active power K of new energy equipment before high voltage ride through P_HVRT 、P set_HV The first active power control coefficient and the second active power control coefficient are respectively crossed by high voltage.
2. The method of claim 1, wherein the dc fault condition comprises at least one of: multiple commutation failure faults and direct current blocking faults.
3. The method of claim 1, wherein the threshold for entering a low voltage ride through is 0.9p.u., and the threshold for entering a high voltage ride through is 1.1p.u.
4. The method of claim 1, wherein the fault clears when the voltage at the machine side of the new energy device is above a threshold for entering a low voltage ride through and below a threshold for entering a high voltage ride through.
5. The method of claim 1, wherein the parameters to be optimized comprise at least one of: the low voltage ride through first, second, third reactive current control coefficients, the low voltage ride through active current first, second, third control coefficients, the high voltage ride through first, second, third reactive current control coefficients, the high voltage ride through first, second active power control coefficients.
6. An apparatus based on the new energy fault ride through control parameter optimization method of any one of claims 1 to 5, wherein the apparatus comprises:
the adjusting module is used for adjusting reactive current, active current and active power of the new energy equipment by utilizing the new energy fault ride-through control model in a simulation environment under the condition that the new energy is connected into the ultra-high voltage direct current transmission end power grid direct current fault, and adjusting the active current of the new energy equipment to recover according to a fixed slope mode after the fault is cleared;
the acquisition module is used for adjusting the parameters to be optimized in the new energy fault ride-through control model and the recovery slope in the fixed slope mode to acquire the optimal parameters to be optimized and the optimal recovery slope by taking the minimum transient overvoltage of the near-zone new energy machine end of the extra-high voltage direct current transmission end in the simulation environment of the new energy access extra-high voltage direct current transmission end power grid as a target.
7. A storage device having stored therein a plurality of program codes, wherein the program codes are adapted to be loaded and executed by a processor to perform the new energy failure crossing control parameter optimization method according to any one of claims 1 to 5.
8. A control device comprising a processor and a storage device, the storage device being adapted to store a plurality of program codes, characterized in that the program codes are adapted to be loaded and run by the processor to perform the new energy failure crossing control parameter optimization method of any one of claims 1 to 5.
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