CN110611327A - Fault ride-through control method and system for offshore double-fed wind turbine generator - Google Patents
Fault ride-through control method and system for offshore double-fed wind turbine generator Download PDFInfo
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Abstract
The invention provides a fault ride-through control method and a system for an offshore double-fed wind turbine generator, which comprise the following steps: when a fault occurs, judging whether the terminal voltage exceeds the limit or not according to the collected terminal voltage of the offshore double-fed wind turbine generator: if so, the offshore wind power grid-connected system enters a low-voltage duration, and preset active and reactive power coordination control is executed; otherwise, when the time for restoring the normal terminal voltage is within the time threshold, the offshore wind power grid-connected system enters a fault clearing later stage, and reactive power support quit control is executed. The method and the system consider transient characteristic change caused by the high-voltage alternating-current transmission alternating-current cable of the offshore wind power, active reactive power coordination control is executed in a low-voltage period, reactive support quit control is executed after faults are cleared, fault ride-through capability of an offshore wind power grid-connected system is improved, and stability of the offshore wind power grid-connected system is enhanced.
Description
Technical Field
The invention belongs to the technical field of new energy power generation control, and particularly relates to a fault ride-through control method and system for an offshore double-fed wind turbine generator.
Background
Offshore wind farms mainly have 3 grid-connected power transmission modes: the high-voltage alternating-current transmission technology, the high-voltage direct-current transmission technology and the frequency division transmission technology have obvious advantages in short-distance transmission and become a commonly adopted transmission mode for offshore wind farms. A submarine alternating current cable is generally adopted in an offshore wind power high-voltage alternating current transmission line, and compared with an overhead line commonly used for onshore wind power, the alternating current submarine cable has the advantages that capacitive charging reactive power is large, voltage characteristics are obviously different from transient characteristics, and the overvoltage problem is easy to occur. Around the technical challenges faced by offshore wind power grid-connected systems, a great deal of research work is developed in the academic circles at home and abroad. The method mainly makes great progress in the aspects of power transmission, power collection and transformation design, operation control and the like of offshore wind power, and mainly covers the contents of an offshore wind power high-voltage alternating current/direct current power transmission technology, power collection and transformation system optimization design, power prediction, remote cluster control and the like. However, after a fault, the transient characteristic of the offshore wind power plant sent out of the system through the alternating current cable changes, the fault ride-through control method of the traditional wind turbine generator unit faces adaptability problems, and the fault ride-through of the offshore wind power plant sent out of the system through the alternating current cable faces new difficulties.
Disclosure of Invention
In order to overcome the defect that the prior art is difficult to adapt to the fault ride-through of the offshore wind power, the invention provides a fault ride-through control method of an offshore double-fed wind turbine generator, and the improvement is as follows:
when a fault occurs, judging whether the generator terminal voltage exceeds the limit or not according to the collected generator terminal voltage of the offshore double-fed wind turbine generator:
if yes, the offshore wind power grid-connected system enters a low-voltage duration, and preset active and reactive power coordination control is executed;
otherwise, when the time for restoring the normal terminal voltage is within a time threshold, the offshore wind power grid-connected system enters a fault clearing later stage, and reactive power support quit control is executed.
The first preferred technical scheme provided by the invention has the improvement that the judging whether the generator terminal voltage exceeds the limit or not according to the collected generator terminal voltage of the offshore double-fed wind turbine generator comprises the following steps:
judging whether the collected generator terminal voltage of the offshore double-fed wind turbine generator is less than or equal to a voltage threshold value:
if so, the terminal voltage is out of limit, otherwise, the terminal voltage is not out of limit.
In a second preferred embodiment, the improvement of the present invention is that the performing of the preset active and reactive power coordination control includes:
according to the generator terminal voltage, calculating the injected active current and the injected reactive current of the doubly-fed wind turbine generator during the low-voltage duration;
and performing active and reactive power coordination control based on the injected active current and the injected reactive current in the low-voltage duration.
In a third preferred embodiment of the present invention, the improvement is that the calculation formula of the injected reactive current during the low voltage duration is as follows:
Iq1＝1.5(Ue-UT)IN
the calculation formula of the injection active current in the low voltage duration is as follows:
wherein, Iq1Indicating reactive current injected during the low voltage duration, UeRepresents a voltage threshold value, UTRepresents the terminal voltage, INRepresents rated current, Ip1Indicating injected active current during the low voltage duration, ImaxRepresenting the maximum voltage.
In a fourth preferred aspect of the present invention, the improvement wherein the executing of the reactive power support exit control includes:
according to the terminal voltage, calculating the injected active current and the injected reactive current of the doubly-fed wind turbine generator during the reactive power support quitting period;
and performing active and reactive power coordination control based on the injected active current and the injected reactive current during the reactive support quitting period.
In a fifth preferred embodiment of the present invention, the improvement is that the calculation formula of the injection active current during the reactive power support withdrawal period is as follows:
the calculation formula of the injection reactive current during the reactive support quitting period is as follows:
wherein, Ip2Indicating injected active current during reactive support exit, LsRepresenting the stator inductance, L, of a doubly-fed wind turbinemRepresents the mutual inductance of the stator and the rotor of the doubly-fed wind turbine generator, UTIndicating terminal voltage, PrefRepresenting an active power steady state value; i isq2Indicating the injected reactive current during reactive support exit.
According to a sixth preferred technical scheme provided by the invention, the improvement is that before the fault occurs:
active and reactive power coordination control in a low-voltage duration period of the offshore double-fed wind turbine generator based on terminal voltage and reactive support quit control in a fault clearing later stage are designed;
and determining that the active reactive power coordination control in the low-voltage duration period of the offshore doubly-fed wind turbine generator based on the generator terminal voltage and the reactive support quit control in the post-fault clearing stage normally operate in the offshore doubly-fed wind turbine generator control system.
The improvement of a fault ride-through control system of an offshore doubly-fed wind turbine, comprising: the system comprises a judgment module, a coordination control module and a reactive quit module;
the judgment module is used for judging whether the machine end voltage exceeds the limit or not according to the collected machine end voltage of the offshore double-fed wind turbine generator when a fault occurs;
the coordination control module is used for executing preset active and reactive power coordination control when the terminal voltage exceeds the limit and the offshore wind power grid-connected system enters a low-voltage duration;
the reactive power quitting module is used for executing reactive power support quitting control when the terminal voltage is not out of limit and the time for restoring the terminal voltage to be normal is within a time threshold value and the offshore wind power grid-connected system enters a fault clearing later stage.
In a seventh preferred aspect of the present invention, the improvement is that the coordination control module includes: a coordination control calculation unit and a coordination control unit;
the coordination control calculation unit is used for calculating the injected active current and the injected reactive current of the doubly-fed wind turbine generator during the low-voltage duration period according to the generator terminal voltage;
and the coordination control unit is used for carrying out active and reactive power coordination control on the basis of the injected active current and the injected reactive current in the low-voltage duration.
In an eighth preferred embodiment, the improvement of the present invention is that the reactive exit module includes: the reactive exit control unit is used for controlling the reactive exit of the reactive exit computing unit;
the reactive quitting calculation unit is used for calculating injected active current and injected reactive current of the doubly-fed wind turbine generator during reactive support quitting according to the generator terminal voltage;
and the reactive power quitting control unit is used for performing active and reactive power coordination control on the basis of the injected active current and the injected reactive current during the reactive power support quitting period.
Compared with the closest prior art, the invention has the following beneficial effects:
the invention provides a fault ride-through control method and a fault ride-through control system for an offshore double-fed wind turbine generator, wherein when a fault occurs, whether a generator terminal voltage exceeds a limit is judged according to the collected generator terminal voltage of the offshore double-fed wind turbine generator: if so, the offshore wind power grid-connected system enters a low-voltage duration, and preset active and reactive power coordination control is executed; otherwise, when the time for restoring the normal terminal voltage is within the time threshold, the offshore wind power grid-connected system enters a fault clearing later stage, and reactive power support quit control is executed. The method considers transient characteristic change caused by the offshore wind power high-voltage alternating-current transmission alternating-current cable, executes active and reactive power coordination control during low voltage, and executes reactive support quit control after fault clearing, so that the fault ride-through capability of the offshore wind power grid-connected system is improved, and the stability of the offshore wind power grid-connected system is enhanced.
Drawings
Fig. 1 is a schematic flow diagram of a fault ride-through control method for an offshore double-fed wind turbine generator set according to the present invention;
FIG. 2 is a schematic flow diagram of an embodiment of a fault ride-through control method for an offshore doubly-fed wind turbine generator, provided by the invention;
fig. 3 is a schematic diagram of a control structure and a principle of a fault ride-through control method for an offshore double-fed wind turbine generator according to the present invention;
FIG. 4 is a schematic diagram of a basic structure of a fault ride-through control system of an offshore doubly-fed wind turbine generator, provided by the invention;
fig. 5 is a detailed structural schematic diagram of a fault ride-through control system of an offshore doubly-fed wind turbine generator, provided by the invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
The offshore wind power transmission generally adopts a high-voltage alternating-current transmission technology, capacitive charging reactive power of a power transmission line is increased due to the use of a submarine alternating-current cable, and transient characteristics of an offshore wind power grid-connected system are remarkably changed after a short-circuit fault occurs, so that the fault ride-through characteristic of the system is influenced. The invention provides a fault ride-through control method and system for an offshore double-fed wind turbine generator set, aiming at the problem of difficulty in fault ride-through caused by the fact that the capacitance of a power transmission line of an offshore wind power grid-connected system is increased, and the fault ride-through capability of the offshore wind power grid-connected system is improved.
The schematic flow diagram of the fault ride-through control method for the offshore doubly-fed wind turbine generator set is shown in fig. 1, and the method comprises the following steps:
step 1: when a fault occurs, judging whether the terminal voltage exceeds the limit or not according to the collected terminal voltage of the offshore double-fed wind turbine generator:
step 2: if so, the offshore wind power grid-connected system enters a low-voltage duration, and preset active and reactive power coordination control is executed;
and step 3: otherwise, when the time for restoring the normal terminal voltage is within the time threshold, the offshore wind power grid-connected system enters a fault clearing later stage, and reactive power support quit control is executed.
Specifically, the implementation process of the fault ride-through control method of the offshore doubly-fed wind turbine generator set is as follows:
step 101: designing a fault ride-through control strategy of the offshore double-fed wind turbine generator based on generator terminal voltage.
The fault ride-through control strategy of the offshore double-fed wind turbine generator comprises the following steps: and determining an adopted control mode according to the terminal voltage of the offshore double-fed wind turbine generator, wherein the control mode comprises a fault ride-through control mode or a steady-state operation control mode. Specifically, the fault ride-through control mode determines active current and reactive current output by the offshore double-fed wind turbine generator according to terminal voltage, and performs active and reactive coordination control and reactive support quit control, namely the fault ride-through control mode comprises active and reactive power coordination control in a low-voltage duration period and reactive support quit control in a fault clearing later stage, the specific flow of the fault ride-through control mode is shown in fig. 2, and the control structure and principle are shown in fig. 3, and the fault ride-through control mode comprises two-stage control functions.
1) And performing active and reactive coordination control on the doubly-fed wind turbine generator during the low-voltage duration.
Reactive current is injected according to the minimum dynamic reactive power requirement of the national standard GB/T19963-2011 on the low-voltage ride through technical requirement of the wind power plant, and the rest capacity of the wind turbine generator generates active power under the condition of meeting the dynamic reactive current injection. The active and reactive coordinated control strategy of the doubly-fed wind turbine generator in the low-voltage duration is as follows.
Iq1＝1.5(Ue-UT)IN
In the formula, whereinq1Indicating an injected reactive current for the duration of the low voltage,Trepresents the terminal voltage, INRepresents rated current, Ip1Indicating injected active current during the low voltage duration, ImaxRepresents the maximum value of voltage, UeAnd the voltage threshold value is represented, and when the voltage of the terminal is less than or equal to the voltage threshold value, the low-voltage continuous state is entered. U shapeeThe specific value may be 0.9. Usually, the terminal voltage is 0.2 or higher, so U in the above formulaTIs in the range of [0.2,0.9 ]]。
2) And the reactive support after the fault is cleared is out of control.
After the fault is cleared, the reactive support exits as soon as possible, reactive power is absorbed as required, and active power is restored to a normal level value as soon as possible. The active and reactive coordination control strategy of the double-fed wind turbine generator after fault clearing is as follows.
In the formula (I), the compound is shown in the specification,Ip2indicating injected active current during reactive support exit, LsRepresenting the stator inductance, L, of a doubly-fed wind turbinemRepresents the mutual inductance of the stator and the rotor of the doubly-fed wind turbine generator, UTIndicating terminal voltage, PrefRepresenting an active power steady state value; i isq2Indicating the injected reactive current during reactive support exit.
Step 102: and determining that the fault ride-through control strategy of the offshore double-fed wind turbine generator based on the generator terminal voltage normally operates in the control system of the offshore double-fed wind turbine generator.
The double-fed wind turbine generator system runs according to a pre-designed active and reactive cooperative fault ride-through control strategy, and the double-fed wind turbine generator system can be ensured to run in two different control modes respectively: a steady state operation control mode and a fault ride-through control mode.
Step 103: and judging whether the offshore wind power grid-connected system is in a short-circuit fault state or not based on the voltage signal at the detection terminal and determining a control mode.
Step 103 specifically comprises: real-time detection terminal voltage U of offshore double-fed wind turbine generatorTJudging whether the terminal voltage is out of limit:
if the terminal voltage is less than or equal to a preset voltage threshold, the offshore wind power grid-connected system enters a fault ride-through first stage of a preset fault ride-through control mode;
when the voltage of the terminal is larger than a preset voltage threshold value and the duration time of the voltage larger than the preset voltage threshold value is smaller than a preset time threshold value, the offshore wind power grid-connected system enters a second fault ride-through stage of a preset fault ride-through control mode;
otherwise, the offshore wind power grid-connected system enters a preset steady-state operation control mode.
In actual operation, the voltage threshold may be set to 0.9pu and the time threshold may be set to 10 seconds.
Step 104: and when the generator terminal voltage is out of limit, a fault ride-through control mode of the offshore double-fed wind turbine generator is activated.
In the active and reactive cooperative fault ride-through control strategy of the offshore double-fed wind turbine generator, the active and reactive cooperative control functions of the double-fed wind turbine generator during the low-voltage duration and after fault clearing are activated. The control method comprises two different control processes, when the terminal voltage is less than or equal to 0.9pu, a low-voltage duration period, namely a fault ride-through first stage, active and reactive coordination control of the low-voltage duration period is executed, reactive current is injected according to the dynamic reactive minimum requirement of the national standard GB/T19963-2011 on the low-voltage ride-through technical requirement of a wind power plant, and the rest capacity of the wind turbine generator generates active power under the condition that the dynamic reactive current injection is met; and the voltage of the generator end is recovered to be more than 0.9pu within 10s, namely a fault ride-through second stage, the active power and reactive power coordination control after the fault is cleared is executed, the reactive support is quitted as soon as possible, the reactive power is absorbed as required, and the active power is recovered to a normal level value as soon as possible.
Step 105: and when the voltage of the machine end is normal, the steady state operation control mode of the offshore double-fed wind turbine generator is activated.
In the active and reactive cooperative fault ride-through control strategy of the offshore double-fed wind turbine generator, the active and reactive cooperative control function of the double-fed wind turbine generator during the low-voltage duration period and the active and reactive cooperative control function of the double-fed wind turbine generator after fault clearing do not work, and the double-fed wind turbine generator is in a steady-state operation control state.
In the invention, different unit fault ride-through control strategies are respectively adopted during the low voltage period and after the fault is cleared, so that the fault ride-through capability of the offshore wind power grid-connected system is improved, and the stability of the offshore wind power grid-connected system is enhanced.
Example 2:
based on the same invention concept, the invention also provides a fault ride-through control system of the offshore double-fed wind turbine generator, and the principle of solving the technical problems of the devices is similar to that of the fault ride-through control method of the offshore double-fed wind turbine generator, so repeated parts are not repeated.
The basic structure of the system is shown in fig. 4, and comprises: the system comprises a judgment module, a coordination control module and a reactive quit module;
the device comprises a judging module, a judging module and a judging module, wherein the judging module is used for judging whether the machine end voltage exceeds the limit or not according to the collected machine end voltage of the offshore double-fed wind turbine generator when a fault occurs;
the coordination control module is used for executing preset active and reactive power coordination control when the offshore wind power grid-connected system with the out-of-limit terminal voltage enters a low-voltage duration;
and the reactive exit module is used for executing reactive support exit control when the terminal voltage does not exceed the limit and the time for recovering the terminal voltage to be normal is within a time threshold and the offshore wind power grid-connected system enters a fault clearing later stage.
The detailed structure of the fault ride-through control system of the offshore doubly-fed wind turbine generator is shown in fig. 5.
Wherein, the coordination control module includes: a coordination control calculation unit and a coordination control unit;
the coordination control calculation unit is used for calculating the injected active current and the injected reactive current of the doubly-fed wind turbine generator during the low-voltage duration according to the generator terminal voltage;
and the coordination control unit is used for carrying out active and reactive power coordination control on the basis of the injected active current and the injected reactive current in the low-voltage duration.
Wherein, idle exit module includes: the reactive exit control unit is used for controlling the reactive exit of the reactive exit computing unit;
the reactive quitting calculation unit is used for calculating the injected active current and the injected reactive current of the doubly-fed wind turbine generator during the reactive support quitting period according to the generator terminal voltage;
and the reactive quitting control unit is used for performing active and reactive power coordination control on the basis of the injected active current and the injected reactive current during reactive support quitting.
The system also comprises an initialization module for initialization, wherein the initialization module comprises a design unit and a confirmation unit;
the design unit is used for designing active and reactive power coordination control of the offshore double-fed wind turbine generator set in a low-voltage duration period and reactive support quit control of a fault clearing later stage based on generator terminal voltage;
and the confirming unit is used for confirming that the active reactive power coordination control of the offshore double-fed wind turbine generator set in the low voltage duration and the reactive support quit control of the fault clearing later stage based on the generator terminal voltage normally operate in the offshore double-fed wind turbine generator set control system.
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.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present application and not for limiting the scope of protection thereof, and although the present application is described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that after reading the present application, they can make various changes, modifications or equivalents to the specific embodiments of the application, but these changes, modifications or equivalents are all within the scope of protection of the claims to be filed.
Claims (10)
1. A fault ride-through control method for an offshore double-fed wind turbine generator is characterized by comprising the following steps:
when a fault occurs, judging whether the generator terminal voltage exceeds the limit or not according to the collected generator terminal voltage of the offshore double-fed wind turbine generator:
if yes, the offshore wind power grid-connected system enters a low-voltage duration, and preset active and reactive power coordination control is executed;
otherwise, when the time for restoring the normal terminal voltage is within a time threshold, the offshore wind power grid-connected system enters a fault clearing later stage, and reactive power support quit control is executed.
2. The method of claim 1, wherein the determining whether the terminal voltage is out of limit according to the collected terminal voltage of the offshore doubly-fed wind turbine generator comprises:
judging whether the collected generator terminal voltage of the offshore double-fed wind turbine generator is less than or equal to a voltage threshold value:
if so, the terminal voltage is out of limit, otherwise, the terminal voltage is not out of limit.
3. The method of claim 1, wherein the performing the pre-determined active reactive power coordination control comprises:
according to the generator terminal voltage, calculating the injected active current and the injected reactive current of the doubly-fed wind turbine generator during the low-voltage duration;
and performing active and reactive power coordination control based on the injected active current and the injected reactive current in the low-voltage duration.
4. The method of claim 3, wherein the injected reactive current for the low voltage duration is calculated as follows:
Iq1＝1.5(Ue-UT)IN
the calculation formula of the injection active current in the low voltage duration is as follows:
wherein, Iq1Indicating reactive current injected during the low voltage duration, UeRepresents a voltage threshold value, UTRepresents the terminal voltage, INRepresents rated current, Ip1Indicating injected active current during the low voltage duration, ImaxRepresenting the maximum voltage.
5. The method of claim 1, wherein the performing reactive support exit control comprises:
according to the terminal voltage, calculating the injected active current and the injected reactive current of the doubly-fed wind turbine generator during the reactive power support quitting period;
and performing active and reactive power coordination control based on the injected active current and the injected reactive current during the reactive support quitting period.
6. The method of claim 5, wherein the injected active current during reactive support exit is calculated as follows:
the calculation formula of the injection reactive current during the reactive support quitting period is as follows:
wherein, Ip2Indicating injected active current during reactive support exit, LsRepresenting the stator inductance, L, of a doubly-fed wind turbinemRepresents the mutual inductance of the stator and the rotor of the doubly-fed wind turbine generator, UTIndicating terminal voltage, PrefRepresenting an active power steady state value; i isq2Indicating the injected reactive current during reactive support exit.
7. The method of claim 1, wherein, when a fault occurs:
active and reactive power coordination control in a low-voltage duration period of the offshore double-fed wind turbine generator based on terminal voltage and reactive support quit control in a fault clearing later stage are designed;
and determining that the active reactive power coordination control in the low-voltage duration period of the offshore doubly-fed wind turbine generator based on the generator terminal voltage and the reactive support quit control in the post-fault clearing stage normally operate in the offshore doubly-fed wind turbine generator control system.
8. The utility model provides a marine double-fed wind turbine generator system trouble passes through control system which characterized in that includes: the system comprises a judgment module, a coordination control module and a reactive quit module;
the judgment module is used for judging whether the machine end voltage exceeds the limit or not according to the collected machine end voltage of the offshore double-fed wind turbine generator when a fault occurs;
the coordination control module is used for executing preset active and reactive power coordination control when the terminal voltage exceeds the limit and the offshore wind power grid-connected system enters a low-voltage duration;
the reactive power quitting module is used for executing reactive power support quitting control when the terminal voltage is not out of limit and the time for restoring the terminal voltage to be normal is within a time threshold value and the offshore wind power grid-connected system enters a fault clearing later stage.
9. The system of claim 8, wherein the coordination control module comprises: a coordination control calculation unit and a coordination control unit;
the coordination control calculation unit is used for calculating the injected active current and the injected reactive current of the doubly-fed wind turbine generator during the low-voltage duration period according to the generator terminal voltage;
and the coordination control unit is used for carrying out active and reactive power coordination control on the basis of the injected active current and the injected reactive current in the low-voltage duration.
10. The system of claim 8, wherein the reactive exit module comprises: the reactive exit control unit is used for controlling the reactive exit of the reactive exit computing unit;
the reactive quitting calculation unit is used for calculating injected active current and injected reactive current of the doubly-fed wind turbine generator during reactive support quitting according to the generator terminal voltage;
and the reactive power quitting control unit is used for performing active and reactive power coordination control on the basis of the injected active current and the injected reactive current during the reactive power support quitting period.
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| CN111934326A (en) * | 2020-06-30 | 2020-11-13 | 中国电力科学研究院有限公司 | Method and system for coordinately controlling high voltage ride through of wind generating set |
| CN111969649A (en) * | 2020-08-03 | 2020-11-20 | 华中科技大学 | Control method and system for improving power transmission limit of double-fed fan in weak grid |
| CN113922410A (en) * | 2021-10-26 | 2022-01-11 | 国网上海市电力公司 | Hybrid Direct Current (DC) sending system and low voltage fault ride-through method thereof |
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| CN111934326A (en) * | 2020-06-30 | 2020-11-13 | 中国电力科学研究院有限公司 | Method and system for coordinately controlling high voltage ride through of wind generating set |
| WO2022000898A1 (en) * | 2020-06-30 | 2022-01-06 | 中国电力科学研究院有限公司 | Method and system for coordinated control of high-voltage ride-through of wind turbine generator set |
| CN111969649A (en) * | 2020-08-03 | 2020-11-20 | 华中科技大学 | Control method and system for improving power transmission limit of double-fed fan in weak grid |
| CN113922410A (en) * | 2021-10-26 | 2022-01-11 | 国网上海市电力公司 | Hybrid Direct Current (DC) sending system and low voltage fault ride-through method thereof |
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