CN117013618A - Comprehensive inertia control method for stabilizing wind power active support transmitting end power grid frequency - Google Patents
Comprehensive inertia control method for stabilizing wind power active support transmitting end power grid frequency 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
- H02J3/466—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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear 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
- 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
- H02J3/36—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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
- 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
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- 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
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Abstract
The application relates to a comprehensive inertia control method for stabilizing the frequency of a wind power active support transmitting end power grid, and belongs to the field of transient analysis of power systems. Based on the virtual synchronous control and the sagging control of the doubly-fed wind turbine, a frequency cooperative control strategy is provided, and the problem of transient frequency stability of a large-scale wind power transmission grid can be effectively solved. Establishing a control model of the doubly-fed wind turbine, and analyzing the working principles of maximum power point tracking control, pitch angle control and rotor side converter control; establishing a double-fed fan mathematical model based on virtual synchronous control, and designing a control structure based on the virtual synchronous control; analyzing a variable speed and variable pitch angle control principle, and designing a sagging control structure of the doubly-fed fan; the advantages of virtual synchronization and sagging control are combined, the capacity of the double-fed fan for participating in system frequency adjustment is fully excavated, and the double-fed fan has a great effect on improving the frequency response capacity of the sending end system.
Description
Technical Field
The application relates to the field of transient analysis of power systems, in particular to a comprehensive inertia control method for stabilizing the frequency of a wind power active support power transmission end power grid based on combination of virtual synchronous control and sagging control of a doubly-fed wind turbine.
Background
Wind energy becomes one of the most promising new energy sources due to the reproducibility, pollution-free property and better economy, the wind power resources in China are mainly concentrated in regions such as northwest, north China, northeast, southwest and the like, and the load center is concentrated in the middle east. Therefore, centralized grid-connected power generation of a large-scale wind farm and transmission to each load center through a multi-circuit high-voltage direct current line (LCC-HVDC) are becoming the main form for large-scale development and utilization of wind power in China. Although the large-scale wind power is adopted to effectively improve the utilization rate of wind power and relieve the power supply pressure in a load center area through the high-voltage alternating current-direct current delivery system, the frequency-rotation speed decoupling response characteristic of the wind turbine generator can bring great threat to a delivery end system unlike a synchronous generator. With the continuous increase of the permeability of wind power, the problems of low inertia and weak frequency modulation capability of the power grid at the transmitting end are further highlighted, once a direct current blocking fault occurs, huge active impact is caused on the power grid at the transmitting end, huge active power surplus exists at the transmitting end side, the system frequency is rapidly increased, incorrect treatment is even possible to cause linkage accidents of the whole power grid, and the high-frequency problem of the power grid at the transmitting end is very serious. A series of researches are developed by related scholars at home and abroad on wind power active support control, mainly, power reserve is reserved in advance, the wind power initial state works in a secondary advantage, when power shortage occurs in a power grid, short-time power support of the power grid is realized by adopting a control mode of changing rotating speed or pitch angle, but the control cannot fully excavate the kinetic energy potential of a wind power rotor, and the control is not suitable for the high-frequency problem possibly caused. Therefore, a comprehensive inertia control strategy for stabilizing the frequency of the wind power active support power transmission end power grid is provided for better solving the problem of stabilizing the frequency of the power transmission end power grid of the novel power system.
Disclosure of Invention
The application aims to provide a comprehensive inertia control method for stabilizing the frequency of a wind power active support power transmission end power grid, which effectively solves the problem of the frequency stability of the power transmission end power grid of a novel power system and has a boosting effect on the development of the novel power system. According to the method, the virtual synchronous control and the sagging control advantages of the doubly-fed fans are combined to provide a coordinated frequency support control strategy, so that the frequency modulation capacity of the power grid at the transmitting end is effectively enhanced. The application can effectively enhance the frequency modulation capability of the power grid at the transmitting end, is an effective means for solving the problem of stable frequency of the power grid which is transmitted by high-voltage direct current from large-scale wind power, and enhances the transmission capability of the large-scale wind power which is transmitted remotely.
The above object of the present application is achieved by the following technical solutions:
the comprehensive inertia control method for stabilizing the frequency of the wind power active support transmitting end power grid comprises the following steps:
(1) Analyzing the working principle of the doubly-fed fan;
(2) Virtual synchronous control design of the doubly-fed fans;
(3) Drooping control design of the doubly-fed fan;
(4) A frequency support control strategy that accounts for coordination of virtual synchronization and droop.
The working principle analysis of the doubly-fed wind turbine in the step (1) is as follows: and analyzing a maximum power point tracking control model, a pitch angle control model and a rotor-side converter control model of the doubly-fed fan, and laying a foundation for the subsequent design of a doubly-fed fan frequency support control strategy.
The virtual synchronous control design of the doubly-fed fan in the step (2) is as follows: on the basis of the step (1), a double-fed fan mathematical model based on virtual synchronous control is established, the required virtual compensation control quantity is deduced, and a double-fed fan control structure model based on virtual synchronous control is designed.
The droop control design of the doubly-fed wind turbine in the step (3) is as follows: on the basis of the step (1), a droop control method of the doubly-fed fan is designed based on a variable speed load shedding and variable pitch angle control method, and a droop control structure model is built, so that the doubly-fed fan effectively participates in a primary frequency modulation process of the system.
The frequency support control strategy for virtual synchronization and droop coordination in the step (4) is as follows: based on the steps (2) and (3), fully excavating wind power frequency modulation capability, and combining virtual synchronous control and sagging control of the doubly-fed fans to realize a comprehensive inertia control strategy of wind power active support transmitting-end power grid frequency stabilization.
The application has the beneficial effects that: the control strategy combines the advantages of virtual synchronous control and sagging control of the doubly-fed fan, fully exerts the superiority of the doubly-fed fan in the system frequency adjustment capability, and has great effect on improving the frequency response capability of the feed-end system. By providing a frequency cooperative control strategy, the frequency adjustment capability of the power grid at the transmitting end of large-scale wind power transmitted by high-voltage direct current can be effectively enhanced. The strategy can effectively strengthen the transmission capacity of large-scale wind power long-distance sending.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate and explain the application and together with the description serve to explain the application.
FIG. 1 is a block diagram of a doubly fed wind turbine rotor side inverter control architecture;
FIG. 2 is a schematic block diagram of a doubly-fed fan control based on virtual synchronous control according to the present application;
FIG. 3 is a schematic block diagram of a doubly-fed wind turbine droop control according to the present application;
FIG. 4 is a block diagram of a frequency support control architecture based on virtual synchronization and droop coordination in accordance with the present application;
FIG. 5 is a topology block diagram of a modified 4-machine 11-node system of the present application;
fig. 6 to 8 are frequency response characteristic diagrams of different control strategies according to the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application. In order that the above-recited objects, features and advantages of the present application will become more readily apparent, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1 to 8, the comprehensive inertia control method for stabilizing the frequency of the wind power active support power transmission end power grid provided by the application provides a frequency cooperative control strategy based on the virtual synchronous control and the sagging control of the doubly-fed wind power generator, and can effectively solve the problem of transient frequency stabilization of a large-scale wind power transmission power grid. The strategy combines the advantages of virtual synchronization and sagging control, fully exploits the capacity of the doubly-fed fan for participating in system frequency adjustment, combines the advantages of the doubly-fed fan virtual synchronization control and sagging control to provide a coordinated frequency support control strategy, and effectively improves the frequency response capacity of a power grid at a transmitting end. Has great effect on improving the frequency response capability of the transmitting end system. Several basic control models of the doubly-fed wind turbine are established, and the working principles of maximum power point tracking control, pitch angle control and rotor side converter control are analyzed; establishing a double-fed fan mathematical model based on virtual synchronous control, and designing a double-fed fan control structure based on virtual synchronous control; analyzing a variable speed and variable pitch angle control principle, and designing a sagging control structure of the doubly-fed fan; based on virtual synchronous control and sagging control, a comprehensive inertia control strategy for stabilizing the frequency of a wind power active support transmitting end power grid is provided. The method comprises the following steps:
1. double-fed fan working principle
The asynchronous motor of the doubly-fed fan is similar to a common wound-type asynchronous induction motor in structure, the voltage of the stator side and the flux linkage direction are different by 90 degrees during operation, and the expression of the power of the stator side can be obtained by park transformation to the dq0 coordinate system:
in the formula: i.e sd 、i sq Respectively representing a d-axis stator current component and a q-axis stator current component; i.e rd 、i rq Representing a d-axis rotor current component and a q-axis rotor current component, respectively; l (L) m Expressed as mutual inductance between stator and rotor; l (L) s Representing stator self-inductance; u (u) sd 、u sq Respectively representing a d-axis stator voltage component and a q-axis stator voltage component.
As can be seen from the formula (1-1), the active power and the reactive power output by the stator side of the doubly-fed wind machine are directly related to the q-axis rotor current component and the d-axis rotor current component, and the two components have decoupling property and can be independently controlled. Wherein active power can be controlled by adjusting the q-axis rotor current component and reactive power can be controlled by adjusting the d-axis rotor current component.
FIG. 1 shows a rotor-side converter control junction for decoupling control of output active and reactive power based on q-axis and d-axisAnd (5) constructing a block diagram. In the active power control loop, according to the doubly-fed fan rotor speed omega t And MPPT characteristic curve to obtain power reference value P sref Then pass through the active power value P s The difference is made to obtain a q-axis current reference value i through a PI control link of the active power controller qref Finally, the current value i is equal to the actual q-axis current value i q The difference is input into the RSC through a modulation signal of an active power control link obtained by a PI control link of a rotor side current controller. In the reactive power control loop, according to a given machine-side voltage reference value U sref And the actual voltage value U at the stator side s The difference is made to obtain a d-axis current reference value i through a PI control link of the reactive power controller dref Then pass through the current value i of the actual d axis d The difference is input into the RSC through a modulation signal of a reactive power control link obtained by a PI control link of a rotor side current controller. Therefore, decoupling control of the output active power and the reactive power is realized through the control process of the rotor-side converter.
2. Virtual synchronous control of doubly-fed fans
At the Park-transformed dq0 axis, the stator-rotor voltage expression of DFIG:
in the formula: i.e sd 、i sq Respectively representing a d-axis stator current component and a q-axis stator current component; i.e rd 、i rq Representing a d-axis rotor current component and a q-axis rotor current component, respectively; l (L) m Expressed as mutual inductance between stator and rotor; l (L) s Representing stator self-inductance; l (L) r Indicating rotor self-inductance; psi phi type sd 、ψ sq Represented as components of the stator flux linkage in the d-axis and q-axis, respectively; psi phi type rd 、ψ rq Expressed as components of the rotor flux linkage in the d-axis and q-axis, respectively; u (u) sd 、u sq Expressed as components of the stator voltage in the d-axis and q-axis, respectively; u (u) rd 、u rq Expressed as components of the rotor voltage in the d-axis and q-axis, respectively.
The stator flux linkage equation can be further simplified to obtain:
in the formula, omega vsg Is a virtual rotating speed, U s Is the stator voltage.
The relation expression of the rotor current and the stator current can be obtained by the following:
double-fed fan rotor rotational speed omega t And omega vsg The relationship of (2) can be expressed as:
in the formula, omega vr For virtual slip angular velocity, θ vr Is the virtual slip angle.
Substitution of formula (3-6) into formula (3-3) can result in:
in the formula, U vrd U is the compensation component of the rotor voltage on the d-axis vrq The compensation component on the q-axis for the rotor reference voltage can be expressed as:
from the above derivation, applying virtual synchronous control in a doubly-fed wind machine requires adding a control structure providing virtual inertia in a conventional control mode, so that the frequency response of the transmitting end system has inertial manifestation. The control model of the rotor-side converter of the doubly-fed wind turbine shows that the active power and the reactive power output by the stator side of the doubly-fed wind turbine have decoupling property and can be independently controlled, and the virtual synchronous control is different from the virtual synchronous control in that elements of the virtual synchronous control are added from two aspects of an excitation adjusting module and a rotor motion equation, and the elements comprise control logic of the two aspects, so that the doubly-fed wind turbine has the frequency response characteristic of the synchronous machine. A doubly-fed fan control block diagram based on virtual synchronization control is obtained as shown in fig. 2.
As can be seen from fig. 2, the doubly-fed fan control structure based on virtual synchronous control is provided with more virtual synchronous compensation modules than in the conventional control mode, and includes adding a virtual inertia coefficient and a virtual slip angle in a rotor motion equation, obtaining a phase angle value of an output voltage through the virtual rotor motion equation, adding a reactive power virtual control coefficient and an outer loop control virtual compensation voltage in an excitation adjustment module, thereby obtaining a virtual excitation current value, effectively inputting a reference voltage value under virtual synchronous control to dq-abc coordinate change under the joint control of the outer loop current and the outer loop voltage, and finally inputting the reference voltage value to a rotor side converter through PWM modulation. The virtual synchronization control of the doubly-fed fan is realized, so that the doubly-fed fan has frequency inertia response capability, the frequency supporting capability of a feed end system is greatly improved, and the safe and stable operation of the system is ensured.
3. Double-fed fan sagging control
Aiming at a power grid at a transmitting end with serious high-frequency problems, a doubly-fed fan can adopt overspeed load shedding control and pitch angle changing control methods to reduce the output power of the fan from an MPPT power point to a specified value point, thereby participating in primary frequency modulation of a system. The control method is characterized by comprising the following design ideas: by introducing an additional primary frequency modulation control link, an additional power instruction caused by the frequency change of the power grid is input to the rotor-side converter, so that the grid-connected electromagnetic power of the fan is changed, the rotor rotating speed or the pitch angle is reduced to a load shedding operation point by combining the unbalanced torque of the wind power rotor shafting, and the primary frequency modulation process of the wind power active participation transmitting end system is completed, wherein the control principle is shown in figure 3.
Firstly, the frequency deviation value is input into a control link, and the adjustment sequence is decided by judging the power command value and the wind speed value obtained by the frequency modulation gain coefficient A. At medium and low wind speeds, a power modulation signal is input to a rotor side controller for rotating speed adjustment, overspeed load shedding control process is completed, and when the rotating speed reaches a limit value, namely 1.2 times of rated rotating speed, the pitch angle control quantity is adjusted through a PI link, so that the pitch angle changing control process is completed; and under the condition of high wind speed, the rotating speed reaches a limit value state, and the pitch angle changing control is directly carried out to complete the primary frequency modulation process of the wind turbine. The sagging control method of the doubly-fed wind turbine enhances the primary frequency modulation capability of the feed-end system containing large-scale wind power, can effectively and rapidly perform frequency response when dealing with serious high-frequency problems of the feed-end system, improves the frequency supporting capability of the system, and can ensure the stable operation of the system.
4. Virtual synchronization and droop coordinated frequency support control
The virtual synchronous control is to increase a virtual inertia and damping control module to enable the doubly-fed wind turbine to have the frequency inertia response capability of the synchronous machine, and the droop control is to enable the doubly-fed wind turbine to have the capability of participating in primary frequency modulation of the system by adding frequency-power modulation signals, and the frequency supporting capability of a power grid at a transmitting end containing large-scale wind power can be improved by both control methods. The frequency response capability of both are compared from the mathematical expression.
The frequency-active control mathematical expression of the virtual synchronization is:
in the formula, P ref For outputting an active power reference value; omega r 、ω ref 、ω g Respectively outputting an angular frequency, an angular frequency reference value and an angular frequency measurement value; k (K) v Virtual control coefficients are virtual synchronization; J. d is the virtual inertia coefficient and damping coefficient, respectively.
The frequency-active control mathematical expression of droop control is:
P ref -P s ＝K a (ω r -ω ref ) (4-2)
in the formula, K a The scaling factor is controlled for sagging.
As can be seen from formulas (4-1) and (4-2), if K v ＝K a In IIIn the case of the same control coefficient, when J, D is 0, the mathematical expressions of the two frequency-active controls are the same. It can be stated that virtual synchronous control can be regarded as a droop control with inertial and damping response.
Therefore, a control strategy of interaction coordination of virtual control and droop control is provided, virtual synchronous control and pitch angle control are combined in a rotor shaft model, so that the doubly-fed wind turbine has inertial response capability, and the capability of an overspeed method and a pitch method for supporting frequency response can be fully utilized, and a control block diagram is designed as shown in fig. 4.
As can be seen from fig. 4, in the virtual rotor shaft control section, the mechanical power command value P is obtained by adding the frequency-power modulation amount obtained by droop control and the MPPT power output amount m And the virtual inertia coefficient J and the damping coefficient D are added, the virtual synchronous control is combined with the traditional control, the inertia response capability of the doubly-fed fan is realized, the control strategy combines the advantages of the virtual synchronous control and the sagging control, the capability of the doubly-fed fan for participating in the system frequency adjustment is fully excavated, and the doubly-fed fan has a great effect on improving the frequency response capability of a feed-end system.
In summary, in order to verify the effectiveness of the comprehensive inertia control strategy of the frequency stability of the power grid of the active support transmitting end of the provided wind power, a modified 4-machine 11-node system shown in fig. 5 is built in a PSCAD/EMTDC simulation platform for simulation analysis. The modified 4-machine 11-node system is used for simulating to obtain characteristic curve comparison diagrams of the frequency of the power grid at the power transmission end, the rotating speed of the rotor of the fan and the pitch angle of the fan, as shown in figures 6 to 8, and the effectiveness and feasibility of the comprehensive inertia control strategy for stabilizing the frequency of the power grid at the power transmission end of the active support of the provided wind power can be verified through the comparison of the change curves under different control strategies.
The above description is only a preferred example of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. of the present application should be included in the protection scope of the present application.
Claims (5)
1. A comprehensive inertia control method for stabilizing the frequency of a wind power active support transmitting-end power grid is characterized by comprising the following steps of: the method comprises the following steps:
(1) Analyzing the working principle of the doubly-fed fan;
(2) Virtual synchronous control design of the doubly-fed fans;
(3) Drooping control design of the doubly-fed fan;
(4) A frequency support control strategy that accounts for coordination of virtual synchronization and droop.
2. The comprehensive inertia control method for stabilizing the frequency of the wind power active support power transmission end grid according to claim 1, which is characterized by comprising the following steps: the working principle analysis of the doubly-fed wind turbine in the step (1) is as follows: and analyzing a maximum power point tracking control model, a pitch angle control model and a rotor-side converter control model of the doubly-fed fan, and laying a foundation for the subsequent design of a doubly-fed fan frequency support control strategy.
3. The comprehensive inertia control method for stabilizing the frequency of the wind power active support power transmission end grid according to claim 1, which is characterized by comprising the following steps: the virtual synchronous control design of the doubly-fed fan in the step (2) is as follows: on the basis of the step (1), a double-fed fan mathematical model based on virtual synchronous control is established, the required virtual compensation control quantity is deduced, and a double-fed fan control structure model based on virtual synchronous control is designed.
4. The comprehensive inertia control method for stabilizing the frequency of the wind power active support power transmission end grid according to claim 1, which is characterized by comprising the following steps: the droop control design of the doubly-fed wind turbine in the step (3) is as follows: on the basis of the step (1), a droop control method of the doubly-fed fan is designed based on a variable speed load shedding and variable pitch angle control method, and a droop control structure model is built, so that the doubly-fed fan effectively participates in a primary frequency modulation process of the system.
5. The comprehensive inertia control method for stabilizing the frequency of the wind power active support power transmission end grid according to claim 1, which is characterized by comprising the following steps: the frequency support control strategy for virtual synchronization and droop coordination in the step (4) is as follows: based on the step (2) and the step (3), fully excavating wind power frequency modulation capability, and combining virtual synchronous control and sagging control of the doubly-fed wind power generator to realize a comprehensive inertia control strategy for stabilizing the wind power active support power grid frequency of the transmitting end.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117638997A (en) * | 2024-01-25 | 2024-03-01 | 国网经济技术研究院有限公司 | DC frequency controller parameter optimization method considering wind speed fluctuation of wind power plant at transmitting end |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117638997A (en) * | 2024-01-25 | 2024-03-01 | 国网经济技术研究院有限公司 | DC frequency controller parameter optimization method considering wind speed fluctuation of wind power plant at transmitting end |
| CN117638997B (en) * | 2024-01-25 | 2024-04-05 | 国网经济技术研究院有限公司 | DC frequency controller parameter optimization method considering wind speed fluctuation of wind power plant at transmitting end |
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