CN108736772B - Open-winding brushless doubly-fed generator system fault-tolerant control based on direct power control - Google Patents

Open-winding brushless doubly-fed generator system fault-tolerant control based on direct power control Download PDF

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CN108736772B
CN108736772B CN201810501732.7A CN201810501732A CN108736772B CN 108736772 B CN108736772 B CN 108736772B CN 201810501732 A CN201810501732 A CN 201810501732A CN 108736772 B CN108736772 B CN 108736772B
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machine
open
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side converter
voltage vector
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CN108736772A (en
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金石
施隆
徐振耀
刘光伟
于思洋
奚云峰
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Shenyang University of Technology
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Shenyang University of Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/007—Control circuits for doubly fed generators
    • H02J3/386—
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
    • H02P21/141—Flux estimation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2101/00—Special adaptation of control arrangements for generators
    • H02P2101/15—Special adaptation of control arrangements for generators for wind-driven turbines
    • 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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Abstract

The system comprises an open-winding brushless doubly-fed generator (1), wherein the open-winding brushless doubly-fed generator (1) is provided with two sets of three-phase symmetrical stator windings with different pole numbers, and a fault-tolerant control method adopted after different faults occur is provided based on a direct power control method aiming at single-tube and double-tube open-circuit faults of a machine-side converter in the open-winding brushless doubly-fed wind generator system.

Description

Open-winding brushless doubly-fed generator system fault-tolerant control based on direct power control
The technical field is as follows:
the invention belongs to the field of wind power generation, and particularly relates to an open-winding brushless doubly-fed wind generator system and a fault-tolerant control method.
Background art:
the brushless doubly-fed generator has the advantages of being brushless in structure, low in maintenance cost, small in required converter capacity, high in reliability and the like, and the brushless doubly-fed generator is widely concerned in the field of wind power generation. In the field of large-scale wind power generation, such as offshore wind power generation systems, the environment is severe, so that the high reliability of the system becomes the premise of sustainable operation. The wind generating set generally comprises a motor, a controller, a converter and a series of sensors, wherein any link fails to work, and the system is affected: the performance of the wind power generation system is influenced if the wind power generation system is small, and all the wind power generation systems are paralyzed if the wind power generation system is heavy. Therefore, the reliability of any link should be paid sufficient attention.
The power switch devices in the converter are frequently switched on or off under the influence of a system control strategy, and are greatly influenced by the working environment of the converter and the energy flow of the system, so that the converter, particularly a machine side inversion part, is often a weak link which is easy to break down in the system. Many circuits with detection and protection functions, including overvoltage and overcurrent protection circuits, driving protection circuits, buffer circuits and the like, are integrated in modern intelligent power modules, so that safe and stable operation of the converter is guaranteed to a certain extent. However, the offshore wind power generation environment is complex, and a plurality of disturbances can cause the failure of the power switch device protection circuit. Therefore, it is important to adopt a proper fault-tolerant control strategy to enable the system to continuously and stably operate after the power switching device fails and still meet the required indexes.
In addition, direct power control is a novel brushless doubly-fed generator control method, the active power and the reactive power of a brushless doubly-fed motor can be directly subjected to feedback control, the method emphasizes the acceleration of the dynamic response speed of the active power and the reactive power, and the method is more suitable for being applied to the field of wind power generation. The open winding structure is applied to the brushless doubly-fed generator, so that the converter capacity of the system can be effectively reduced, and the fault-tolerant capability of the system is improved.
Disclosure of Invention
The purpose of the invention is as follows:
the invention provides an open winding brushless double-fed wind driven generator system and a fault-tolerant control method, and aims to solve the problem that the open winding brushless double-fed wind driven generator system cannot continuously and stably operate after a power switch device of an on-machine side converter fails, and further improve the reliability of the system.
The technical scheme is as follows:
open winding brushless double-fed windForce generator system, its characterized in that: the system comprises an open-winding brushless double-fed generator (1), wherein the open-winding brushless double-fed generator (1) is provided with two sets of three-phase symmetrical stator windings with different pole numbers, namely a power winding (2) and a control winding (3), the power winding (2) is connected with a power grid (5), and the pole number of the power winding (2) is ppThe control winding (3) is of an open winding structure, namely 6 terminals of the control winding (3) are respectively led out from two ends, the two ends are respectively connected with the first machine side converter (6) and the second machine side converter (7), and the number of pole pairs of the control winding (3) is pcThe coupling relation between the power winding (2) and the control winding (3) is realized by the rotor (4), and the number of pole pairs of the rotor (4) is pr＝pp+pc。
The fault-tolerant control method of the open-winding brushless doubly-fed wind generator system is characterized by comprising the following steps: aiming at single-tube and double-tube open-circuit faults of a double-machine-side converter, active power and reactive power of a power winding are independently controlled by selecting a proper space voltage vector based on a direct power control method, so that a system can run in a fault-tolerant mode after a power switch device fails; the method comprises the steps of re-establishing a switching voltage vector selection table according to error signals of active power and reactive power of a power winding (2), information of a sector where a flux linkage of a control winding (3) is located and fault information, and directly and independently controlling the active power and the reactive power of the open-winding brushless doubly-fed generator by properly selecting a switching voltage vector, so that fault-tolerant operation of a system after a power switch device is in fault is realized.
Collecting a voltage signal (u) of a power winding (2)p) And a current signal (i)p) And a voltage signal (u) for controlling the winding (3)c) And a current signal (i)c) The voltage signal (u) of the power winding (2) under the two-phase static coordinate system is obtained through a coordinate transformation module (8)pαβ) And a current signal (i)pαβ) And a voltage signal (u) for controlling the winding (3)cαβ) And a current signal (i)cαβ) Voltage signal (u) of the power winding (2)pαβ) And a current signal (i)pαβ) The instantaneous active power (P) output by the power winding (2) is obtained through the instantaneous power calculation module (9)pAnd) reactive power (Q)p) Controlling the voltage signal (u) of the winding (3)cαβ) And a current signal (i)cαβ) The flux angle (theta) is obtained through a control winding flux sector judgment module (10), and the active power given value (P) of the power winding (2)ref) Actual value (P) of active power of the power winding (2)p) The error value (delta P) between the actual active power value and the given value of the power winding (2) is obtained by comparing the active power hysteresis comparator (11)p) Given value of reactive power (Q) of the power winding (2)ref) Actual value (Q) of reactive power with the power winding (2)p) The error value (delta Q) between the actual reactive power value and the given value of the power winding (2) is obtained by comparing the actual reactive power value with the given value through a reactive power hysteresis comparator (12)p) And then, a corresponding switching voltage vector selection table is formulated by combining the fault information and the magnetic chain angle (theta) of the fault diagnosis module (13), and a control signal (u) of the first machine-side converter (6) is obtained through the switching voltage vector selection module (14)abc1) And a control signal (u) of the second machine-side converter (7)abc2) And further driving the open-winding brushless doubly-fed generator (1) to realize fault-tolerant control.
When the first switch (Sa1) of the first machine-side converter (6) has an open-circuit fault, certain voltage vectors output by the double-two-level converter cannot be synthesized; at this time, the system can operate in fault tolerance under the direct power control method by reasonably selecting the rest space voltage vectors, the voltage vector selection methods at this time have two types, and the corresponding space voltage vector selection tables are shown in table 1(a) and table 1 (b):
table 1(a) table for selecting space voltage vector after Sa1 open circuit fault
Figure BDA0001670579440000021
Table 1(b) table for selecting space voltage vector after Sa1 open circuit fault
Figure BDA0001670579440000022
Figure BDA0001670579440000031
When the second switch (Sa2) of the first machine-side converter (6) has an open-circuit fault, certain voltage vectors output by the double-two-level converter cannot be synthesized; at the moment, the system is enabled to operate in a fault-tolerant mode under a direct power control method by reasonably selecting the rest space voltage vectors, the voltage vector selection methods at the moment are of two types, and the corresponding space voltage vector selection tables are shown in a table 2(a) and a table 2 (b):
table 2(a) table for selecting space voltage vector after Sa2 open circuit fault
Figure BDA0001670579440000032
Table 2(b) table for selecting space voltage vector after Sa2 open circuit fault
Figure BDA0001670579440000033
Figure BDA0001670579440000041
When the first switch (Sa1) of the first machine-side converter (6) and the first switch (Sd1) of the second machine-side converter (7) both have open-circuit faults, certain voltage vectors output by the double-two-level converter cannot be synthesized; at this time, the remaining space voltage vectors are reasonably selected to enable the system to operate in a fault-tolerant mode under the direct power control method, and a corresponding space voltage vector selection table is shown in table 3:
table 3 space voltage vector selection table after open circuit fault in both Sa1 and Sd1
Figure BDA0001670579440000042
When the second switch (Sa2) of the first machine-side converter (6) and the second switch (Sd2) of the second machine-side converter (7) both have open-circuit faults, certain voltage vectors output by the double-two-level converter cannot be synthesized; at this time, the system can operate in fault tolerance under the direct power control method by reasonably selecting the remaining space voltage vectors, and the corresponding space voltage vector selection table is shown in table 4:
table 4 space voltage vector selection table after open circuit fault in both Sa2 and Sd2
Figure BDA0001670579440000043
When the first switch (Sa1) of the first machine-side converter (6) and the fourth switch (Se2) of the second machine-side converter (7) both have open-circuit faults, certain voltage vectors output by the double-two-level converter cannot be synthesized; at this time, the system can operate in fault-tolerant under the direct power control method by reasonably selecting the remaining space voltage vectors, the voltage vector selection methods at this time are of two types, and the corresponding space voltage vector selection tables are shown in tables 5(a) and 5 (b):
TABLE 5(a) space Voltage vector selection Table after open Fault for both Sa1 and Se2
Figure BDA0001670579440000044
Figure BDA0001670579440000051
TABLE 5(b) space Voltage vector selection Table after open Fault for both Sa1 and Se2
Figure BDA0001670579440000052
When the second switch (Sa2) of the first machine-side converter (6) and the third switch (Se1) of the second machine-side converter (7) both have open-circuit faults, certain voltage vectors output by the double-two-level converter cannot be synthesized; at this time, the system can operate in fault-tolerant under the direct power control method by reasonably selecting the remaining space voltage vectors, the voltage vector selection methods at this time are of two types, and the corresponding space voltage vector selection tables are shown in tables 6(a) and 6 (b):
table 6(a) space voltage vector selection table after open circuit fault for both Sa2 and Se1
Figure BDA0001670579440000053
TABLE 6(b) space Voltage vector selection Table after open Fault for both Sa2 and Se1
Figure BDA0001670579440000054
Figure BDA0001670579440000061
The invention has the beneficial effects that:
aiming at single-tube and double-tube open-circuit faults of a machine-side converter in an open-winding brushless doubly-fed wind generator system, a fault-tolerant control method adopted after different faults occur is provided based on a direct power control method. And a switching voltage vector selection table is re-established according to error signals of active power and reactive power of the power winding, a sector where a control winding flux linkage is located and fault information, and the active power and the reactive power of the open-winding brushless doubly-fed generator are independently controlled by selecting a proper space voltage vector, so that fault-tolerant operation of the system after the open-circuit fault of a power switching device of the machine-side converter is realized.
Drawings
FIG. 1 is a schematic structural diagram of an open-winding brushless doubly-fed wind generator system according to the present invention;
FIG. 2 is a schematic diagram of the direct power control principle of the open-winding brushless doubly-fed generator according to the present invention;
FIG. 3 is a space voltage vector diagram of the dual two-level converter output of the present invention;
fig. 4 is a space voltage vector synthesis diagram of the output of the dual two-level converter after Sa1 open circuit fault of the machine side converter 6 according to the present invention;
fig. 5 is a space voltage vector synthesis diagram of the output of the dual two-level converter after Sa2 open circuit fault of the machine side converter 7 according to the present invention;
fig. 6 is a space voltage vector composite diagram of the output of the dual-level converter after the Sa1 of the machine-side converter 6 and the Sd1 of the machine-side converter 7 both have an open circuit fault according to the present invention;
fig. 7 is a space voltage vector composite diagram of the output of the dual-level converter after the Sa2 of the machine-side converter 6 and the Sd2 of the machine-side converter 7 both have an open circuit fault according to the present invention;
fig. 8 is a space voltage vector composite diagram of the output of the dual-level converter after the Sa1 of the machine-side converter 6 and the Sd2 of the machine-side converter 7 both have an open circuit fault according to the present invention;
fig. 9 is a space voltage vector composite diagram of the output of the dual-level converter after the Sa2 of the machine-side converter 6 and the Sd1 of the machine-side converter 7 both have an open circuit fault.
Description of reference numerals:
1. an open-winding brushless doubly-fed generator; 2. a power winding; 3. a control winding; 4. a rotor; 5. a power grid; 6. a machine side converter; 7. a machine side converter; 8. a coordinate transformation module; 9. an instantaneous power calculation module; 10. a control winding flux linkage sector judging module; 11. an active power hysteresis comparator; 12. a reactive power hysteresis comparator; 13. a fault diagnosis module; 14. and the space voltage vector selection module.
Detailed Description
The invention provides an open-winding brushless doubly-fed wind generator system, which comprises an open-winding brushless doubly-fed generator 1, wherein the open-winding brushless doubly-fed generator 1 is provided with two sets of three-phase symmetrical stator windings with different pole numbers, namely a power winding 2 and a control winding 3, as shown in figure 1. The power winding 2 is connected with a power grid 5 and used for generating electric energy, and the number of pole pairs is pp(ii) a The control winding 3 is an open winding structure, namely 6 terminals of the control winding 3 are respectively led out from two ends, the two ends are respectively connected with the first machine-side converter 6 and the first machine-side converter 7 and used for slip frequency excitation, and the number of pole pairs is pc. Power winding 2 and control windingThe coupling relation between the rotors 4 is realized by the rotor 4, and the number of pole pairs of the rotor 4 is pr＝pp+pc。
The fault-tolerant control method of the open-winding brushless doubly-fed wind generator system is characterized in that the active power and the reactive power of a power winding are independently controlled by selecting a proper space voltage vector based on a direct power control method aiming at single-tube and double-tube open-circuit faults of a double-machine side converter, so that the system can run in a fault-tolerant mode after a power switch device fails.
FIG. 2 is a schematic diagram of the direct power control principle of the open-winding brushless doubly-fed generator of the present invention, wherein P isrefAnd QrefRespectively representing the given values of the active and reactive power of the power winding 2, PpAnd QpRespectively representing the actual values of active and reactive power, deltaP, of the power winding 2pAnd Δ QpThe method is characterized in that errors of actual values of active power and reactive power of a power winding 2 and a given value are respectively expressed, u represents voltage, i represents current, a corner mark p represents active power 2, a corner mark c represents a control winding 3, a corner mark abc represents a three-phase static coordinate system, and a corner mark alpha beta represents a two-phase static coordinate system.
The control concept of the direct power control method is derived from direct torque control and incorporates instantaneous power theory. A switching voltage vector selection table is formulated according to error signals of active power and reactive power of a power winding 2 and information of a sector where a flux linkage of a control winding 3 is located, and the active power and the reactive power of an open-winding brushless doubly-fed generator are directly and independently controlled by properly selecting a switching voltage vector, so that maximum power tracking control is realized.
Collecting voltage and current signals u of a power winding 2pAnd ipAnd the voltage and current signals u of the control winding 3cAnd icThe voltage and current signals u of the power winding 2 under the two-phase static coordinate system are obtained through the coordinate transformation module 8pαβAnd ipαβAnd control winding 3 voltage and current signals ucαβAnd icαβ，upαβAnd ipαβThe instantaneous active power output by the power winding 2 is obtained through the instantaneous power calculation module 9Power PpAnd reactive power Qp，ucαβAnd icαβThe flux angle theta and the given values P of the active power and the reactive power of the power winding 2 are obtained through a control winding flux linkage sector judgment module 10refAnd QrefActual values of active and reactive power P to the power winding 2pAnd QpThe error value delta P between the actual values of the active power and the reactive power of the power winding 2 and the given value is obtained by comparing the active power hysteresis comparator 11 with the reactive power hysteresis comparator 12pAnd Δ QpThen, the control signals u of the first machine-side converter 6 and the second machine-side converter 7 are obtained through the space voltage vector selection module 14 by combining the fault information and the magnetic chain angle theta of the fault diagnosis module 13abc1And uabc2And further drives the open-winding brushless doubly-fed generator 1 to realize fault-tolerant operation based on direct power control.
Fig. 3 is a composite space voltage vector diagram of the output of the dual two-level converter of the present invention. U shapeabRepresenting the space voltage vector U generated by the first machine-side converter 6aWith the space voltage vector U generated by the first machine-side converter 7bThe resultant space voltage vector. The resultant space voltage vector output by the dual two-level converter is divided into a long vector, a medium vector and a short vector according to different amplitudes, which is specifically shown in table 1. There are 6 long vectors, 12 medium vectors, 1 synthesis method for each long vector, 2 synthesis methods for each medium vector, 36 short vectors, and 6 synthesis methods for each short vector.
TABLE 1 composite space voltage vector types output by a dual two-level converter
Figure BDA0001670579440000071
Figure BDA0001670579440000081
The fault-tolerant control method of the open-winding brushless doubly-fed wind generator system is used as a first machine-side converter 6 of a first machine-side converterThe basic idea of the fault-tolerant control method after the switch Sa1 has an open-circuit fault is as follows: when the first switch Sa1 of the first machine-side converter 6 has an open-circuit fault, some voltage vectors outputted by the dual two-level converter cannot be synthesized, as shown in fig. 4, where the voltage vector that cannot be synthesized is a voltage vector U21、U25、U26、U27、U16、U20、U15、U24、U11、U22、U66、U23、U65、U10、U17、U14、U61、U60、U12、U67、U13、U64、U62、U63. At this time, the remaining space voltage vectors can be reasonably selected to enable the system to operate in fault tolerance under the direct power control method, the voltage vector selection methods are two, which are respectively shown in fig. 4(a) and 4(b), and the voltage vector applied to the fault tolerance control is the voltage vector U in fig. 4(a)36、U41、U52、U05、U34、U75、U04、U74、U03、U54、U73And voltage vector U in FIG. 4(b)06、U30、U37、U45、U76、U05、U34、U75、U04、U74、U03、U54、U73、U02、U43、U50、U57、U72、U01、U32、U40、U47、U56、U71The corresponding space voltage vector selection tables are shown in tables 2(a) and 2 (b).
Table 2(a) table for selecting space voltage vector after Sa1 open circuit fault
Figure BDA0001670579440000082
Table 2(b) table for selecting space voltage vector after Sa1 open circuit fault
Figure BDA0001670579440000083
Figure BDA0001670579440000091
According to the fault-tolerant control method of the open-winding brushless doubly-fed wind generator system, the basic idea of the fault-tolerant control method is that when the second switch Sa2 of the first machine-side converter 6 has an open-circuit fault: when the second switch Sa2 of the first machine-side converter 6 has an open-circuit fault, some voltage vectors outputted by the dual two-level converter cannot be combined, as shown in fig. 5, where the voltage vector that cannot be combined is a voltage vector U35、U36、U31、U46、U30、U37、U45、U34、U41、U32、U40、U47、U56、U33、U44、U55、U42、U51、U43、U50、U57、U54、U52、U53. At this time, the remaining space voltage vectors can be reasonably selected to enable the system to operate in fault tolerance under the direct power control method, the voltage vector selection methods are two, and are respectively shown in fig. 5(a) and 5(b), and the voltage vector applied to the fault tolerance control is the voltage vector U in fig. 5(a)25、U14、U63、U06、U21、U76、U01、U71、U02、U61、U72And voltage vector U in FIG. 5(b)06、U21、U76、U01、U71、U02、U61、U72、U03、U12、U60、U67、U73、U04、U10、U17、U23、U65、U74、U05、U16、U20、U27、U75The corresponding space voltage vector selection tables are shown in tables 3(a) and 3 (b).
Table 3(a) table for selecting space voltage vector after Sa2 open circuit fault
Figure BDA0001670579440000092
Table 3(b) table for selecting space voltage vector after Sa2 open circuit fault
Figure BDA0001670579440000093
The fault-tolerant control method of the open-winding brushless doubly-fed wind generator system has the basic idea that when the first switch Sa1 of the first machine-side converter 6 and the first switch Sd1 of the second machine-side converter 7 both have an open-circuit fault, the fault-tolerant control method is as follows: when the first switch Sa1 of the first machine-side converter 6 and the first switch Sd1 of the second machine-side converter 7 both have open circuit faults, some voltage vectors output by the dual two-level converter cannot be synthesized, as shown in fig. 6, wherein the voltage vector that cannot be synthesized is a voltage vector U36、U26、U25、U31、U46、U06、U21、U76、U16、U20、U27、U15、U24、U41、U01、U32、U56、U71、U11、U22、U66、U10、U17、U23、U65、U14、U42、U51、U02、U61、U72、U12、U60、U67、U13、U64、U52、U62、U63. At this time, the remaining space voltage vectors can be reasonably selected to enable the system to operate in fault tolerance under the direct power control method, the voltage vector selection method is shown in fig. 6, and the voltage vector applied to the fault tolerance control is the voltage vector U in fig. 630、U45、U37、U05、U34、U75、U40、U47、U04、U74、U50、U57、U43、U03、U54、U73The corresponding space voltage vector selection table is shown in table 4.
Table 4 space voltage vector selection table after open circuit fault in both Sa1 and Sd1
Figure BDA0001670579440000101
The fault-tolerant control method of the open-winding brushless doubly-fed wind generator system has the basic idea that when the second switch Sa2 of the first machine-side converter 6 and the second switch Sd2 of the second machine-side converter 7 both have an open-circuit fault, the fault-tolerant control method is as follows: when the second switch Sa2 of the first machine-side converter 6 and the second switch Sd2 of the second machine-side converter 7 both have open circuit faults, some voltage vectors output by the dual two-level converter cannot be synthesized, as shown in fig. 7, wherein the voltage vector that cannot be synthesized is a voltage vector U36、U35、U25、U31、U46、U30、U37、U45、U05、U34、U75、U15、U24、U41、U32、U40、U47、U56、U33、U44、U55、U04、U23、U65、U74、U14、U42、U51、U43、U50、U57、U03、U54、U73、U13、U64、U52、U53、U63. At this time, the remaining space voltage vectors can be reasonably selected to enable the system to operate in fault tolerance under the direct power control method, the voltage vector selection method is shown in fig. 7, and the voltage vector applied to the fault tolerance control is the voltage vector U in fig. 706、U21、U76、U16、U20、U27、U01、U71、U10、U17、U02、U61、U72、U12、U60、U67The corresponding space voltage vector selection table is shown in table 5.
Table 5 space voltage vector selection table after open circuit fault in both Sa2 and Sd2
Figure BDA0001670579440000102
Figure BDA0001670579440000111
The fault-tolerant control method of the open-winding brushless doubly-fed wind generator system has the basic idea that when the first switch Sa1 of the first machine-side converter 6 and the fourth switch Se2 of the second machine-side converter 7 both have an open-circuit fault, the fault-tolerant control method is as follows: when the first switch Sa1 of the first machine-side converter 6 and the fourth switch Se2 of the second machine-side converter 7 both have open circuit faults, some voltage vectors outputted by the dual two-level converter cannot be synthesized, as shown in fig. 8, wherein the voltage vector that cannot be synthesized is a voltage vector U36、U26、U35、U25、U31、U46、U06、U21、U45、U76、U05、U16、U20、U27、U75、U15、U24、U41、U01、U56、U71、U11、U22、U55、U66、U10、U17、U23、U65、U14、U51、U61、U12、U60、U67、U13、U64、U62、U63. At this time, the remaining space voltage vectors can be reasonably selected to enable the system to operate in fault tolerance under the direct power control method, the voltage vector selection methods are two, which are respectively shown in fig. 8(a) and 8(b), and the voltage vector applied to the fault tolerance control is the voltage vector U in fig. 8(a)30、U37、U34、U32、U40、U47、U04、U74、U02、U43、U50、U57、U72、U03、U54、U73And voltage vector U in FIG. 8(b)30、U37、U34、U32、U40、U47、U04、U74、U52、U03、U54、U73The corresponding space voltage vector selection tables are shown in tables 6(a) and 6 (b).
Table 6(a) space voltage vector selection table after open circuit fault for both Sa1 and Se2
Figure BDA0001670579440000112
TABLE 6(b) space Voltage vector selection Table after open Fault for both Sa1 and Se2
Figure BDA0001670579440000113
The fault-tolerant control method of the open-winding brushless doubly-fed wind generator system has the basic idea that when the second switch Sa2 of the first machine-side converter 6 and the third switch Se1 of the second machine-side converter 7 both have open-circuit faults, the fault-tolerant control method is as follows: when the second switch Sa2 of the first machine-side converter 6 and the third switch Se1 of the second machine-side converter 7 both have an open-circuit fault, some voltage vectors outputted by the dual two-level converter cannot be synthesized, as shown in fig. 9, where the voltage vector that cannot be synthesized is a voltage vector U36、U35、U31、U46、U30、U37、U45、U34、U24、U41、U32、U40、U47、U56、U22、U33、U44、U55、U04、U23、U74、U14、U42、U51、U02、U43、U50、U57、U72、U03、U12、U54、U73、U13、U64、U52、U53、U62、U63. At this time, the remaining space voltage vectors can be reasonably selected to enable the system to operate in fault tolerance under the direct power control method, the voltage vector selection methods are two, and are respectively shown in fig. 9(a) and 9(b), and the voltage vector applied to the fault tolerance control is the voltage vector U in fig. 9(a)06、U21、U76、U05、U16、U20、U27、U75、U01、U71、U10、U17、U65、U61、U60、U67And voltage vector U in FIG. 9(b)06、U21、U76、U25、U01、U71、U10、U17、U65、U61、U60、U67The corresponding space voltage vector selection tables are shown in tables 7(a) and 7 (b).
TABLE 7(a) space Voltage vector selection Table after open Fault for both Sa2 and Se1
Figure BDA0001670579440000121
TABLE 7(b) space Voltage vector selection Table after open Fault for both Sa2 and Se1
Figure BDA0001670579440000122

Claims (2)

1. The fault-tolerant control method of the open-winding brushless doubly-fed generator system based on direct power control is characterized by comprising the following steps of: aiming at single-tube and double-tube open-circuit faults of a double-machine-side converter, active power and reactive power of a power winding are independently controlled by selecting a proper space voltage vector based on a direct power control method, so that a system can run in a fault-tolerant mode after a power switch device fails; the method comprises the steps of re-establishing a switching voltage vector selection table according to error signals of active power and reactive power of a power winding (2), information of a sector where a flux linkage of a control winding (3) is located and fault information, and directly and independently controlling the active power and the reactive power of the open-winding brushless doubly-fed generator by properly selecting a switching voltage vector so as to realize fault-tolerant operation of a system after a power switch device is in fault;
the double-machine-side converter comprises a first machine-side converter (6) and a second machine-side converter (7); some voltage vectors output by the dual-machine-side converter cannot be synthesized when the following faults occur: a first switch Sa1 of the first machine-side converter (6) has an open-circuit fault, a second switch Sa2 of the first machine-side converter (6) has an open-circuit fault, a first switch Sa1 of the first machine-side converter (6) and a first switch Sd1 of the second machine-side converter (7) both have open-circuit faults, a second switch Sa2 of the first machine-side converter (6) and a second switch Sd2 of the second machine-side converter (7) both have open-circuit faults, a first switch Sa1 of the first machine-side converter (6) and a fourth switch Se2 of the second machine-side converter (7) both have open-circuit faults, and a second switch Sa2 of the first machine-side converter (6) and a third switch Se1 of the second machine-side converter (7) both have open-circuit faults; at the moment, the system is enabled to operate in a fault-tolerant mode under a direct power control method by selecting the rest space voltage vector;
the method comprises the following steps of dividing a composite space voltage vector output by a double-machine-side converter into a long vector, a medium vector and a short vector according to different amplitudes, wherein the number of the long vectors is 6, the number of the medium vectors is 12, each long vector has 1 synthesis method, each medium vector has 2 synthesis methods, the number of the short vectors is 36, and each short vector has 6 synthesis methods, and the types are as follows:
synthetic space voltage vector type output by double-machine-side converter
Figure FDA0002843759060000011
When the first switch Sa1 of the first machine-side converter (6) has an open-circuit fault, certain voltage vectors output by the double-two-level converter cannot be synthesized; at this time, the system can operate in fault tolerance under the direct power control method by reasonably selecting the rest space voltage vectors, the voltage vector selection methods at this time have two types, and the corresponding space voltage vector selection tables are shown in table 1(a) and table 1 (b):
table 1(a) table for selecting space voltage vector after Sa1 open circuit fault
Figure FDA0002843759060000012
Figure FDA0002843759060000021
Table 1(b) table for selecting space voltage vector after Sa1 open circuit fault
Figure FDA0002843759060000022
When the second switch Sa2 of the first machine-side converter (6) has an open-circuit fault, certain voltage vectors output by the machine-side converter cannot be synthesized; at the moment, the system is enabled to operate in a fault-tolerant mode under a direct power control method by reasonably selecting the rest space voltage vectors, the voltage vector selection methods at the moment are of two types, and the corresponding space voltage vector selection tables are shown in a table 2(a) and a table 2 (b):
table 2(a) table for selecting space voltage vector after Sa2 open circuit fault
Figure FDA0002843759060000023
Table 2(b) table for selecting space voltage vector after Sa2 open circuit fault
Figure FDA0002843759060000024
Figure FDA0002843759060000031
When the first switch Sa1 of the first machine-side converter (6) and the first switch Sd1 of the second machine-side converter (7) both have open-circuit faults, certain voltage vectors output by the two machine-side converters cannot be synthesized; at this time, the remaining space voltage vectors are reasonably selected to enable the system to operate in a fault-tolerant mode under the direct power control method, and a corresponding space voltage vector selection table is shown in table 3:
table 3 space voltage vector selection table after open circuit fault in both Sa1 and Sd1
Figure FDA0002843759060000032
When the second switch Sa2 of the first machine-side converter (6) and the second switch Sd2 of the second machine-side converter (7) both have open-circuit faults, certain voltage vectors output by the two machine-side converters cannot be synthesized; at this time, the system can operate in fault tolerance under the direct power control method by reasonably selecting the remaining space voltage vectors, and the corresponding space voltage vector selection table is shown in table 4:
table 4 space voltage vector selection table after open circuit fault in both Sa2 and Sd2
Figure FDA0002843759060000033
When the first switch Sa1 of the first machine-side converter (6) and the fourth switch Se2 of the second machine-side converter (7) both have open-circuit faults, certain voltage vectors output by the two machine-side converters cannot be synthesized; at this time, the system can operate in fault-tolerant under the direct power control method by reasonably selecting the remaining space voltage vectors, the voltage vector selection methods at this time are of two types, and the corresponding space voltage vector selection tables are shown in tables 5(a) and 5 (b):
TABLE 5(a) space Voltage vector selection Table after open Fault for both Sa1 and Se2
Figure FDA0002843759060000034
Figure FDA0002843759060000041
TABLE 5(b) space Voltage vector selection Table after open Fault for both Sa1 and Se2
Figure FDA0002843759060000042
When the second switch Sa2 of the first machine-side converter (6) and the third switch Se1 of the second machine-side converter (7) both have open-circuit faults, certain voltage vectors output by the two machine-side converters cannot be synthesized; at this time, the system can operate in fault-tolerant under the direct power control method by reasonably selecting the remaining space voltage vectors, the voltage vector selection methods at this time are of two types, and the corresponding space voltage vector selection tables are shown in tables 6(a) and 6 (b):
table 6(a) space voltage vector selection table after open circuit fault for both Sa2 and Se1
Figure FDA0002843759060000043
TABLE 6(b) space Voltage vector selection Table after open Fault for both Sa2 and Se1
Figure FDA0002843759060000044
Figure FDA0002843759060000051
2. The container as claimed in claim 1The error control method is characterized in that: collecting a voltage signal (u) of a power winding (2)p) And a current signal (i)p) And a voltage signal (u) for controlling the winding (3)c) And a current signal (i)c) The voltage signal (u) of the power winding (2) under the two-phase static coordinate system is obtained through a coordinate transformation module (8)pαβ) And a current signal (i)pαβ) And a voltage signal (u) for controlling the winding (3)cαβ) And a current signal (i)cαβ) Voltage signal (u) of the power winding (2)pαβ) And a current signal (i)pαβ) The actual value (P) of the active power output by the power winding (2) is obtained through the instantaneous power calculation module (9)p) And actual value of reactive power (Q)p) Controlling the voltage signal (u) of the winding (3)cαβ) And a current signal (i)cαβ) The flux angle (theta) is obtained through a control winding flux sector judgment module (10), and the active power given value (P) of the power winding (2)ref) Actual value (P) of active power of the power winding (2)p) The error value (delta P) between the actual active power value and the given value of the power winding (2) is obtained by comparing the active power hysteresis comparator (11)p) Given value of reactive power (Q) of the power winding (2)ref) Actual value (Q) of reactive power with the power winding (2)p) The error value (delta Q) between the actual reactive power value and the given value of the power winding (2) is obtained by comparing the actual reactive power value with the given value through a reactive power hysteresis comparator (12)p) And then, a corresponding switching voltage vector selection table is formulated by combining the fault information and the magnetic chain angle (theta) of the fault diagnosis module (13), and a control signal (u) of the first machine-side converter (6) is obtained through the switching voltage vector selection module (14)abc1) And a control signal (u) of the second machine-side converter (7)abc2) And further driving the open-winding brushless doubly-fed generator (1) to realize fault-tolerant control.
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