CN113746140B - Doubly-fed wind turbine fault ride-through method under continuous disturbance of high-voltage direct-current transmission - Google Patents
Doubly-fed wind turbine fault ride-through method under continuous disturbance of high-voltage direct-current transmission 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
- H02J3/381—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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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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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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention discloses a doubly-fed fan fault ride-through method under continuous disturbance of high-voltage direct-current power transmission, which comprises the following steps of: s1, arranging a current source type superconducting magnetic energy storage device at the end of a double-fed fan in the extra-high voltage direct current wind power delivery system; and S2, realizing the linkage voltage disturbance ride-through of the doubly-fed wind turbine generator based on the current limiting function of the distributed current source type superconducting magnetic energy storage device and the reactive power output control function of the fan. The software and hardware cooperative control strategy overcomes the defect that the conventional doubly-fed fan low-pass strategy applying the current source type superconducting magnetic energy storage device is not applicable under the complex voltage disturbance caused by the commutation failure of an extra-high voltage system, is applicable under both a common low-voltage event and the complex voltage disturbance, has excellent current-limiting performance by combining the power regulation capability of a current transformer of the fan, and improves the interlocking voltage disturbance pass-through capability of the fan.
Description
Technical Field
The invention belongs to the technical field of wind turbine generator fault ride-through, and particularly relates to a software and hardware combined DFIG (doubly-fed induction generator) linkage disturbance ride-through method in an HVDC (ultra-high voltage direct current) system.
Background
At present, wind power shows a trend of centralized grid-connected remote transmission under the typical grid characteristics of ultrahigh voltage alternating current-direct current hybrid connection and large-scale trans-regional power transmission in China. Research has shown that, in addition to conventional ac short-circuit faults, disturbance of continuous alternating low voltage and high voltage of a sending end system caused by phase change failure of an extra-high voltage dc wind power delivery system becomes a new cause of wind power grid disconnection accidents in the near region of a dc sending end. When the direct current control system is abnormal or the alternating current side voltage is abnormal to cause phase commutation failure, in the early stage, because the direct current and the trigger angle of the rectification side are increased simultaneously, the direct current needs to absorb a large amount of reactive power from the system. The active power exchanged by the direct current system at the later stage is rapidly reduced, the recovery speed is slow, and the reactive power requirement of the converter station is also rapidly reduced along with the reduction of the active power. At the moment, a large amount of reactive surplus exists in the filter, and the direct current releases a large amount of reactive power to the system, so that the near-zone voltage has the characteristic of being firstly reduced and then increased. In the transient voltage rising stage of the wind power plant, a large amount of reactive surplus of the converter station is superposed with the voltage effect caused by the reactive surplus of the wind power plant due to partial low-voltage ride-through or low-voltage grid disconnection of the wind power plant in the transient voltage lowering stage, so that the overvoltage level of the power grid is aggravated, and the risk of high-voltage grid disconnection and interlocking grid disconnection accidents of a large number of wind power units is higher.
At present, partial research is based on actual voltage disturbance waveforms of Qishao extra-high voltage and Hazheng extra-high voltage, and the cause and the solution of fan grid disconnection accidents are analyzed from the perspective of system power analysis. However, the wind power system is switched in, the fault ride-through capability of the fan is improved, and the scheme of fully utilizing the reactive power regulation capability of the fan is deficient. Aiming at the fault ride-through scheme of the fan, the fault ride-through under low voltage or high voltage caused by pure alternating current fault is mainly concerned, researches have been carried out to apply a current source type superconducting magnetic energy storage device to a typical low voltage ride-through occasion, but under the complex voltage disturbance caused by phase commutation failure, the operation performance of the current source type superconducting magnetic energy storage device can be greatly influenced, and related researches have not been carried out.
Disclosure of Invention
Aiming at the defects in the prior art, the doubly-fed fan fault ride-through method under the continuous disturbance of the high-voltage direct-current power transmission solves the problem that the doubly-fed fan low-ride-through strategy of the existing applied current source type superconducting magnetic energy storage device is possibly inapplicable under the complex voltage disturbance caused by the phase commutation failure of an extra-high voltage system.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that: a doubly-fed wind turbine fault ride-through method under continuous disturbance of high-voltage direct-current transmission comprises the following steps:
s1, arranging a current source type superconducting magnetic energy storage device at the end of a double-fed fan in the extra-high voltage direct current wind power delivery system;
and S2, realizing the linkage voltage disturbance ride-through of the doubly-fed wind turbine generator based on the current limiting function of the distributed current source type superconducting magnetic energy storage device and the reactive power output control function of the fan.
Further, in step S1, in the extra-high voltage direct current wind power delivery system, the structure of the doubly-fed wind turbine generator is as follows: the stator side of the doubly-fed induction generator is connected with an external power grid through a step-up transformer, the rotor side of the doubly-fed induction generator is connected with two power electronic converters with backs, and the current source type superconducting magnetic energy storage device is connected to the end of a fan through a three-phase series transformer;
the two power electronic converters are respectively a rotor side converter and a grid side converter.
Further, the step S2 is specifically:
s21, judging whether a wind power system at a sending end of the extra-high voltage direct current wind power delivery system is in a normal state or a fault state in real time based on the voltage at the fan end;
if the state is normal, go to step S22;
if the fault state is detected, the flow proceeds to step S23;
s22, controlling the reactive power output of the fan to be in a normal operation mode, normally connecting the current source type superconducting magnetic energy storage device to the wind power system, and returning to the step S21;
s23, enabling the wind power system to communicate with the LCC-HVDC control station, and judging whether the current fault state is a direct current fault or an alternating current fault;
if the fault is an ac fault, the process proceeds to step S24;
if the fault is a dc fault, the process proceeds to step S25;
s24, controlling the current source type superconducting magnetic energy storage device to be normally connected to the wind power system and work in a current limiting mode, controlling a reactive reference value output by the fan according to the terminal voltage of the fan, and entering the step S26;
s25, controlling the current source type superconducting magnetic energy storage device to be normally connected to the wind power system and work in a current limiting mode, taking unbalanced reactive power between the current rectifier station and the alternating current system as a reactive power reference value output by the fan, and entering step S26;
and S26, operating the doubly-fed wind turbine generator to realize linkage voltage disturbance ride through.
Further, in step S21, when the voltage at the fan end is detected, the fan end voltage is adjustedU wAt 0.9<U w<1.1, the system is in a normal state; when the terminal voltage of the fan machineU wOver 0.9<U w<1.1 range, the system is in a fault state.
Further, in step S24 and step S25, when the current source type superconducting magnetic energy storage device operates in the current limiting mode, the fan rotor current is less than 2 per unit, and the power electronic converter is in a safe state.
Further, in step S24, when the wind power system is in an ac fault, the reactive current injected into the grid by the fan set is made by adjusting the reactive reference value output by the fan itself
Satisfies the following conditions:
in the formula (I), the compound is shown in the specification,
rated current of the unit;
at this time, the reactive reference value output by the fan is 9/4U w(0.9 – U w)。
Further, in step S25, when the wind power system is in a dc fault, the unbalanced reactive power between the current rectifier station and the ac system is not equal to the reactive power
Comprises the following steps:
in the formula (I), the compound is shown in the specification,
for the short circuit capacity of the sending end alternating current system,
for the normal value of the voltage at the commutation bus,
the voltage at the commutation bus.
The invention has the beneficial effects that:
(1) the software and hardware cooperative control strategy provided by the invention overcomes the defect that the existing doubly-fed fan low-pass strategy applying the current source type superconducting magnetic energy storage device is possibly inapplicable under the complex voltage disturbance caused by the commutation failure of the extra-high voltage system, and is applicable under the common low-voltage event and the complex voltage disturbance;
(2) on the basis of setting the current source type superconducting magnetic energy storage device, the double-fed wind turbine generator self reactive output capacity adjustment is combined, so that on one hand, the over current of a voltage disturbance wind power system is restrained, on the other hand, the self reactive output capacity of the fan is enhanced, and therefore the fan can successfully pass through the linkage low-high voltage disturbance.
Drawings
Fig. 1 is a flow chart of a doubly-fed wind turbine fault ride-through method under continuous disturbance of high-voltage direct-current power transmission provided by the invention.
Fig. 2 is a schematic structural diagram of the extra-high voltage direct current wind power delivery system provided by the invention.
Fig. 3 is a topology diagram of the CSC-SMES device provided by the present invention.
Fig. 4 is an equivalent circuit diagram of the CSC-SMES device provided by the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1, the doubly-fed wind turbine fault ride-through method under the continuous disturbance of the high-voltage direct-current transmission includes the following steps:
s1, arranging a current source type superconducting magnetic energy storage device at the end of a double-fed fan in the extra-high voltage direct current wind power delivery system;
and S2, realizing the linkage voltage disturbance ride-through of the doubly-fed wind turbine generator based on the current limiting function of the distributed current source type superconducting magnetic energy storage device and the reactive power output control function of the fan.
In step S1 of this embodiment, in the extra-high voltage dc wind power delivery system, the structure of the doubly-fed wind turbine generator is: the stator side of the doubly-fed induction generator is connected with an external power grid through a step-up transformer, the rotor side of the doubly-fed induction generator is connected with two power electronic converters with backs, the current source type superconducting magnetic energy storage device is connected to the end of a fan through a three-phase series transformer, the series transformer shows dynamic impedance characteristics when the current of a fan system is different, and then the functions of pressurizing and limiting current are achieved, and the current source type superconducting magnetic energy storage device regulates the secondary side current of the series transformer through controlling a current source converter; the two power electronic converters are respectively a Rotor Side Converter (RSC) and a Grid Side Converter (GSC);
specifically, as shown in fig. 2, a Doubly Fed Induction Generator (DFIG) is composed of a wind turbine, a gear box, a squirrel cage asynchronous generator, two back-to-back power electronic converters (RSC and GSC), and a filter. The wind machine of the unit and the gear box form a prime mover part, a motor stator is directly connected with a power grid, the motor stator is boosted by a boosting transformer and transmitted to an external power grid, and the rotor side is filtered and then connected with the power grid by two backrest power electronic converters. Current Source (CSC) superconducting magnetic energy storage device (Superproduct)An injection magnetic energy storage, SMES)) is shown in fig. 2 as DFIG n, the device is connected to the fan end via a three-phase series transformer. The detailed topology of the CSC-SMES device is shown in fig. 3, with the current source inverter connected directly to the superconducting coils on one side and to the series transformer on the other side via an LC filter. Whereini smes, i sc, i dcRespectively outputting current for the SMES device, current transformer and current passing through the superconducting coil;u as, u bs, u csrespectively representing three-phase voltages at the side of the series transformer;R f, L f, Crepresenting the damping resistance, the filter inductance and the filter capacitance of the LC filter; meanwhile, a buffer and overvoltage protection circuit is arranged for the switch device, when the fan monitors the voltage disturbance at the machine end, a cooperative control strategy of current limiting function and reactive output control of the fan is started on the premise of ensuring that the current is not out of limit, reactive output is carried out, and the power grid is supported.
Step S2 of this embodiment specifically includes:
s21, judging whether a wind power system at a sending end of the extra-high voltage direct current wind power delivery system is in a normal state or a fault state in real time based on the voltage at the fan end;
if the state is normal, go to step S22;
if the fault state is detected, the flow proceeds to step S23;
s22, controlling the reactive power output of the fan to be in a normal operation mode, normally connecting the current source type superconducting magnetic energy storage device to the wind power system, and returning to the step S21;
s23, enabling the wind power system to communicate with the LCC-HVDC control station, and judging whether the current fault state is a direct current fault or an alternating current fault;
if the fault is an ac fault, the process proceeds to step S24;
if the fault is a dc fault, the process proceeds to step S25;
s24, controlling the current source type superconducting magnetic energy storage device to be normally connected to the wind power system and work in a current limiting mode, controlling a reactive reference value output by the fan according to the terminal voltage of the fan, and entering the step S26;
s25, controlling the current source type superconducting magnetic energy storage device to be normally connected to the wind power system and work in a current limiting mode, taking unbalanced reactive power between the current rectifier station and the alternating current system as a reactive power reference value output by the fan, and entering step S26;
and S26, operating the doubly-fed wind turbine generator to realize linkage voltage disturbance ride through.
In the step S21, when the voltage at the fan end is higher than the voltage at the fan endU wAt 0.9<U w<1.1, the system is in a normal state; when the terminal voltage of the fan machineU wOver 0.9<U w<1.1 range, the system is in a fault state.
In the step S22, when the wind power system is in a normal state, the fan sends power according to the instruction of the scheduling system, the CSC-SMES device is normally connected to the wind power system, the equivalent resistance of the device is the primary side leakage impedance of the transformer, and the impedance is very small, so that the operation of the wind power system is hardly affected.
The equivalent principle of the equivalent resistance of the CSC-SMES device in this embodiment is: according to the equivalent circuit of the device as shown in FIG. 4, whereinR 1, L 1, n 1Representing the primary side resistance, leakage inductance and winding turns of the series transformer;R 2, L 2, n 2representing the secondary side resistance, leakage inductance and winding turns of the series transformer;u 1, i 1representing a primary side voltage current of the transformer;u 2, i 2representing a voltage current of a secondary side of the transformer;u crepresenting the capacitor voltage; u i , i erepresenting the transformer excitation voltage and excitation current;R i , L i the equivalent resistance representing the excitation inductance and loss of the transformer core. The current source converter can be equivalent to a controllable current source. The CSC-SMES can maintain the secondary side current of the transformer by controlling the charging and discharging of the superconducting coil. When the secondary current is too large, the superconducting coil is charged to absorb redundant power, and the current is too smallThe coil is discharged to maintain the current constant.
Assuming that the series transformer operates in a linear state, the voltage-current relationship can be obtained from FIG. 4
Neglecting the core loss, the equivalent impedance of the device as seen from the system side is as follows. When the primary side and the secondary side of the transformer have different current proportions, the device has dynamic impedance characteristics.
The output current reference value for controlling the CSC-SMES device is as follows
According to equations (3) and (5), the transformer exciting current is very small. According to equation (4), the device equivalent resistance is
And is the primary side leakage impedance of the transformer.
In step S24 and step S25 of this embodiment, when the current source type superconducting magnetic energy storage device operates in the current limiting mode, the fan rotor current is less than 2 per unit, and the power electronic converter is in a safe state.
Specifically, in step S24, when the wind power system is in an ac fault, which may cause a voltage sag, the CSC-SMES device is first normally connected to the wind power system and operates in a current limiting mode to ensure that the current of the rotor of the wind turbine is less than 2 times per unit, and the converter is in a safe state.
The principle of the CSC-SMES device operating in current limiting mode can be explained as: when the system has an alternating current fault, the doubly-fed wind turbine generates large overcurrent on the stator side. When the stator side current of the double-fed fan is large, the exciting current of the transformer is large, and the device is equivalent to a large inductor connected in series through active induction at the moment. According to equation (4), the inductance value is aboutL i i e / i sf The buffer action of the buffer device slows down the change rate of the generator terminal voltage of the wind turbine generator. When the voltage at the end of the doubly-fed fan changes slowly, transient impact on the fan is small, the fluctuation of the stator current and the rotor current of the fan is small, the rotor current of the fan can be guaranteed to be lower than 2 times per unit, and the converter is in a safe state. When the current at the stator side of the fan is reduced, the corresponding exciting current of the series transformer is reduced, the equivalent resistance of the device is also reduced, and the influence on the voltage at the wind turbine end is also gradually reduced. When the current on the stator side of the fan is reduced to a normal level, the equivalent resistance of the device is consistent with S1, and the influence on the voltage at the fan end is small.
Under the condition, the reactive output control mode of the fan is determined by the voltage at the fan end. When the voltage of the rotor of the fan is detected to be lower than 2 times per unit value and the converter is in a safe state, according to the requirements of GB/T19963-2011, the reactive current injected into the power grid by the fan unit is enabled to be adjusted by adjusting the reactive reference value output by the fan unit
Satisfies the following conditions:
in the formula (I), the compound is shown in the specification,
rated current of the unit;
at this time, the reactive reference value output by the fan is 9/4U w(0.9 – U w)。
Specifically, in step S25, when the wind power system is in a dc fault, a transient ac voltage at the transmitting end may be disturbed; the CSC-SMES device is normally connected to the wind power system and works in a current limiting mode, and the principle of the CSC-SMES device is consistent with that of the CSC-SMES device in S22, so that the current of a rotor of the fan is guaranteed to be lower than 2 times per unit value, and the converter is in a safe state.
The most fundamental reason of sending end alternating current transient voltage disturbance caused by direct current fault is that the reactive power demand of the rectifier station changes, so that unbalanced reactive power is generated. Therefore, a reactive reference value output by the fan is set according to the unbalanced reactive power between the rectifier station and the alternating current system;
at this time, the unbalanced reactive power between the current rectifier station and the AC system
Comprises the following steps:
in the formula (I), the compound is shown in the specification,
for the short circuit capacity of the sending end alternating current system,
the voltage at the small current conversion bus is the normal value of the voltage at the current conversion bus and is obtained through real-time monitoring. The reactive power demand of the rectifier station increases and positive delta appearsQ ac Resulting in a low voltage; the reactive power demand of the rectifier station is reduced, and negative delta appearsQ ac Resulting in a high voltage.
Claims (6)
1. A doubly-fed wind turbine fault ride-through method under continuous disturbance of high-voltage direct-current transmission is characterized by comprising the following steps:
s1, arranging a current source type superconducting magnetic energy storage device at the end of a double-fed fan in the extra-high voltage direct current wind power delivery system;
s2, based on the current limiting function of the distributed current source type superconducting magnetic energy storage device and the reactive power output control function of the fan, the linkage voltage disturbance ride-through of the doubly-fed wind turbine generator is realized;
the step S2 specifically includes:
s21, judging whether a wind power system at a sending end of the extra-high voltage direct current wind power delivery system is in a normal state or a fault state in real time based on the voltage at the fan end;
if the state is normal, go to step S22;
if the fault state is detected, the flow proceeds to step S23;
s22, controlling the reactive power output of the fan to be in a normal operation mode, normally connecting the current source type superconducting magnetic energy storage device to the wind power system, and returning to the step S21;
s23, enabling the wind power system to communicate with the LCC-HVDC control station, and judging whether the current fault state is a direct current fault or an alternating current fault;
if the fault is an ac fault, the process proceeds to step S24;
if the fault is a dc fault, the process proceeds to step S25;
s24, controlling the current source type superconducting magnetic energy storage device to be normally connected to the wind power system and work in a current limiting mode, controlling a reactive reference value output by the fan according to the terminal voltage of the fan, and entering the step S26;
s25, controlling the current source type superconducting magnetic energy storage device to be normally connected to the wind power system and work in a current limiting mode, taking unbalanced reactive power between the current rectifier station and the alternating current system as a reactive power reference value output by the fan, and entering step S26;
and S26, operating the doubly-fed wind turbine generator to realize linkage voltage disturbance ride through.
2. The doubly-fed wind turbine fault ride-through method under the continuous disturbance of the high-voltage direct-current power transmission according to claim 1, wherein in the step S1, in an extra-high voltage direct-current wind power delivery system, the doubly-fed wind turbine generator set has the following structure: the stator side of the doubly-fed induction generator is connected with an external power grid through a step-up transformer, the rotor side of the doubly-fed induction generator is connected with two power electronic converters with backs, and the current source type superconducting magnetic energy storage device is connected to the end of a fan through a three-phase series transformer;
the two power electronic converters are respectively a rotor side converter and a grid side converter.
3. The doubly-fed wind turbine fault ride-through method under the continuous disturbance of the high-voltage direct current transmission according to claim 1, wherein in the step S21, when the wind turbine terminal voltage is higher than the rated voltage, the doubly-fed wind turbine fault ride-through method is adoptedU wAt 0.9<U w<1.1, the system is in a normal state; when the terminal voltage of the fan machineU wOver 0.9<U w<1.1 range, the system is in a fault state.
4. The doubly-fed wind turbine fault ride-through method under the continuous disturbance of the high-voltage direct-current transmission according to claim 1, wherein in the steps S24 and S25, when the current source type superconducting magnetic energy storage device works in the current limiting mode, the current of the wind turbine rotor is lower than 2 per unit, and the power electronic converter is in a safe state.
5. The doubly-fed wind turbine fault ride-through method under the continuous disturbance of the high-voltage direct current transmission according to claim 4, wherein in the step S24, when the wind power system is in the alternating current fault, the reactive reference value output by the wind turbine is adjusted to enable the wind turbine set to inject the reactive current into the power grid
Satisfies the following conditions:
in the formula (I), the compound is shown in the specification,
the current of the unit is the rated current,U wis the fan section voltage;
at this time, the reactive reference value output by the fan is 9/4U w(0.9 – U w)。
6. The doubly-fed wind turbine fault ride-through method under the continuous disturbance of the high-voltage direct-current transmission according to claim 4, wherein in the step S25, when the wind power system is in the direct-current fault, the unbalanced reactive power between the current rectifying station and the alternating-current system is not balanced
Comprises the following steps:
in the formula (I), the compound is shown in the specification,
for the short circuit capacity of the sending end alternating current system,
for the normal value of the voltage at the commutation bus,
the voltage at the commutation bus.
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