CN109085447A - Wind electric converter open-circuit fault detection method based on current amplitude - Google Patents
Wind electric converter open-circuit fault detection method based on current amplitude Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
- G01R31/27—Testing of devices without physical removal from the circuit of which they form part, e.g. compensating for effects surrounding elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The wind electric converter open-circuit fault detection method based on current amplitude that the invention discloses a kind of includes the following steps: to carry out PARK transformation to the three-phase current of motor, obtains the electric angle of three-phase current；According to rotor angle locating for the electric angle combination initial time motor of three-phase current, initial phase difference is determined；According to initial phase difference rotor angle in conjunction with locating for current time motor, the auxiliary mechanical angle of three-phase current is determined；Three-phase motor current amplitude is determined according to the auxiliary mechanical angle of three-phase current；According to three-phase motor current amplitude and motor speed, judge whether current transformer breaks down, if breaking down, location of fault is determined according to the auxiliary mechanical angle of three-phase current, otherwise continues the monitoring of subsequent time.The present invention can quickly, accurately detect current transformer open-circuit fault, determine the position of defective device, and to the strong robustness of wind speed variation.
Description
Technical field
The present invention relates to wind generator system fault diagnosis technologies, are specifically related to a kind of wind-powered electricity generation change based on current amplitude
Flow device open-circuit fault detection method.
Background technique
Back-to-back type current transformer is the core component and fragility link of direct drive permanent magnetic synchronous wind generating system.Current transformer
Open-circuit fault once occurs for IGBT, such as handles not in time, will lead to power network current wave distortion, power supply quality is reduced, if when long
Between nonserviceable lower operation, it will cause more catastrophe failure, jeopardize entire power grid security.Therefore, in wind generator system
Quickly the generation of detection wind electric converter open-circuit fault, the position where accurate judgement fault element are most important.
Existing wind electric converter open-circuit fault detection method is broadly divided into two types, one is by curent change into
Row fault diagnosis and location, another kind are to carry out fault diagnosis and location by voltage change.Chinese patent CN103344866A
(Huang Keyuan, Liu Jingjia, Huang are held on even to dead in order to perfect one's virtue, and a kind of open-circuit fault diagnostic method of permanent magnet direct-drive wind power generation system current transformer of is waited)
The diagnosis and positioning of current transformer IGBT open circuit are carried out by the variation by electric current park transformation vector phase.But this method
It can not achieve real-time diagnosis, and be only applicable to the constant situation of wind speed, not can be carried out the diagnosis of failure in the case where becoming wind friction velocity
And positioning.Paper " the permanent magnet direct-drive wind power system current transformer open-circuit fault diagnosis based on line voltage error " (Hang Jun, Zhang Jianzhong,
Cheng Ming waits to diagnose [J] China electrical engineering based on the permanent magnet direct-drive wind power system current transformer open-circuit fault of line voltage error
Report, 2017,37 (10): 2933-2943.) pass through the diagnosis and positioning of voltage change progress current transformer IGBT open circuit.But it should
Method needs to increase the cost of system using additional voltage sensor, while also increasing the failure probability of system.Cause
This, for the fault diagnosis of fan converter, it is necessary to develop new method for diagnosing faults, adapt to the operation ring that blower becomes wind speed
Border, and realize with simple method the real-time diagnosis of failure.
Summary of the invention
The purpose of the present invention is to provide a kind of open-circuit fault diagnosis sides of direct drive permanent magnetic wind generator system current transformer
Method can be realized the quick diagnosis and positioning of change/determine current transformer open-circuit fault under wind conditions.
The technical solution for realizing the aim of the invention is as follows: a kind of wind electric converter open-circuit fault inspection based on current amplitude
Survey method, includes the following steps:
Step 1 carries out PARK transformation to the three-phase current of motor, obtains the electric angle of three-phase current；
Step 2, the rotor angle according to locating for the electric angle combination initial time motor of three-phase current, determine initial phase
Potential difference；
Step 3, according to initial phase difference combine current time motor locating for rotor angle, determine the auxiliary of three-phase current
Mechanical angle；
Step 4 determines three-phase motor current amplitude according to the auxiliary mechanical angle of three-phase current；
Step 5, according to three-phase motor current amplitude and motor speed, judge whether current transformer breaks down, if occur therefore
Barrier, then determine location of fault according to the auxiliary mechanical angle of three-phase current, otherwise continues the monitoring of subsequent time.
Compared with prior art, the present invention its remarkable advantage are as follows: the present invention can quickly, accurately detect current transformer open circuit event
Barrier determines the position of defective device, and to the strong robustness of wind speed variation.
Detailed description of the invention
Fig. 1 is the flow chart of wind electric converter open-circuit fault detection method of the present invention.
Fig. 2 is the structure chart of the PMSG wind power system of back to back structure of the present invention.
System construction drawing when Fig. 3 is current transformer IGBT open-circuit fault of the present invention.
Fig. 4 be wind speed variation when accidental conditions and fault condition under motor operating parameter figure.
Fig. 5 is the variation diagram of B, C phase current magnitude absolute value under single tube failure when wind speed changes.
Fig. 6 is the variation diagram of A phase current magnitude absolute value and auxiliary mechanical angle under single tube failure when wind speed changes.
The variation diagram of Fig. 7 current amplitude absolute value under two-tube failure when being wind speed variation.
The variation diagram of Fig. 8 current amplitude absolute value and auxiliary mechanical angle under two-tube failure when being wind speed variation.
Specific implementation method
The present invention program is further illustrated in the following with reference to the drawings and specific embodiments.
Fig. 1 is the topological diagram of PMSG wind power system back to back structure current transformer, and Fig. 2 gives when generator-side converter wear one
When there is open-circuit fault in IGBT pipe, the topology diagram of system.In practical application, IGBT and with its antiparallel two
The probability that pole pipe breaks down simultaneously is minimum.So the present invention only considers that the open-circuit fault of IGBT in current transformer, default are anti-with it
Diode in parallel still works normally.
As shown in figure 3, the open-circuit fault diagnostic method of direct drive permanent magnetic wind generator system current transformer, the inspection including failure
The positioning with failure is surveyed, steps are as follows:
Step 1, acquisition A, B, C three-phase current ia、ib、ic, Park transformation is carried out respectively, obtains the electrical angle of three-phase current
Spend θc, calculation formula are as follows:
In formula, iα、iβIndicate α, β shaft current under two-phase stationary coordinate system.
Rotor angle locating for step 2, acquisition initial time motorr0, calculate the electric angle θ of every phasecWith n θr0It is initial
Phase difference θf, so that θc=n θr0+θf, wherein n is the number of pole-pairs of magneto；
Step 3 acquires rotor angle locating for the motor at current timer, enable θm=n θr+θf, define θmA、θmB、θmCFor A,
B, the auxiliary mechanical angle of C three-phase current, so that θmA=θm, θmB=θm-2/3*π、θmC=θm+2/3*π.According to formula calculate A,
B, it C three-phase motor current amplitude and takes absolute value, when assisting mechanical angle, θmA、θmB、θmCPositioned at [1.51,1.66] and [4.60,
4.81] when section, without the calculating of corresponding phase current magnitude, enable the current amplitude of corresponding phase for the electricity under nominal operating conditions
Amplitude is flowed, this patent takes 100A, when the mechanical angle, θ of auxiliarymA、θmB、θmCPositioned at the section [1.51,1.66] and [4.60,4.81] it
When outer, calculation formula is as follows:
Step 4, when motor speed is greater than given threshold and certain phase current magnitude and is less than current threshold, judge that current transformer should
Open-circuit fault occurs for phase bridge arm, and this patent setting speed threshold value is 2.5rad/s, and current amplitude threshold value is 10A；
Step 5, when failures are detected compares fault location in conjunction with the current corresponding stand-by motor mechanical angle
Relation table judges the abort situation that failure occurs；
Fault location relation table
In table, ima、imb、imcIndicate the amplitude of A, B, C three-phase current, θmxIndicate the auxiliary mechanical angle of A, B, C three-phase current
Degree, x A, B, C.
Step 6, when being detected simultaneously by three-phase current amplitude and being respectively less than threshold value, the corresponding mechanical angle of record A phase current
All fault diagnosis results occurred in the section 0-2 π export the diagnostic result for repeating twice or more, as two-tube
The judging result of failure.
Fault detecting and positioning method of the invention is suitable for the single tube and multitube open-circuit fault of generator-side converter wear IGBT.
Embodiment 1
The present embodiment is illustrated method for diagnosing faults so that open-circuit fault occurs for pusher side T1 as an example.(the corresponding IGBT of T1
Position is as shown in Figure 1), the case where other single IGBT open-circuit faults, diagnostic method is identical.
Park transformation is carried out to the instantaneous value of three-phase current first, current rotor is then obtained by electric machines test and is rotated
Angle, θr, calculated as follows: 1. calculating the electric angle θ of initial time A, B, C three-phase currentcWith n θr0Phase difference θf, make
Obtain θc=n θr0+θf, wherein n is the number of pole-pairs of magneto.2. enabling θm=n θr+θf, enable θmA=θm, θmB=θm-2/3*π、θmC=
θm+2/3*π.3. calculating A, B, C three-phase motor current amplitude according to formula and taking absolute value, when the mechanical angle, θ of auxiliarymA、θmB、
θmCWhen positioned at [1.51,1.66] and [4.60,4.81] section, without the calculating of corresponding phase current magnitude, the phase current is exported
Amplitude is 100A.4. the absolute value of each phase current magnitude is compared with the threshold value of current amplitude, when current amplitude absolute value
When less than threshold value 10A, determine that open-circuit fault occurs.5. by comparing result, the auxiliary machine of each phase current magnitude absolute value and threshold value
Tool angular range is compared with fault location table, obtains fault location result.
In the present embodiment, open-circuit fault occurs in 2s for setting T1, and Fig. 6 gives failure detection result, at the 2s moment
Afterwards, detect that the amplitude ima of A phase current lower than threshold value, is maintained near 0, A phase bridge arm open-circuit fault occurs for judgement at this time；When
When open-circuit fault signal generates, the situation of change of mechanical angle is assisted with A phase at this time according to A phase current magnitude under open-circuit fault,
Fault location is carried out according to 1 fault location table of table, obtaining positioning result is T1 open-circuit fault；When Fig. 5 gives A phase fault, B, C
The current amplitude situation of change of two-phase, equal fault-free erroneous judgement generate.
The embodiment is equally applicable to two-tube on same bridge arm while there is a situation where open-circuit fault, diagnosis and localization methods
It is identical as the embodiment.
Embodiment 2
The present embodiment is illustrated method for diagnosing faults so that open-circuit fault occurs for pusher side T1, T3 as an example.(T1, T3 couple
The position IGBT answered is as shown in Figure 1), the case where other IGBT open-circuit faults in position of the same race, diagnostic method is identical.
Park transformation is carried out to the instantaneous value of three-phase current first, current rotor is then obtained by electric machines test and is rotated
Angle, θr, calculated as follows: 1. calculating the electric angle θ of initial time A, B, C three-phase currentcWith n θr0Phase difference θf, make
Obtain θc=n θr0+θf, wherein n is the number of pole-pairs of magneto.2. enabling θm=n θr+θf, enable θmA=θm, θmB=θm-2/3*π、θmC=
θm+2/3*π.3. calculating A, B, C three-phase motor current amplitude according to formula and taking absolute value, when the mechanical angle, θ of auxiliarymA、θmB、
θmCWhen positioned at [1.51,1.66] and [4.60,4.81] section, without the calculating of corresponding phase current magnitude, the phase current is exported
Amplitude is 100A.4. the absolute value of each phase current magnitude is compared with the threshold value of current amplitude, when current amplitude absolute value
When less than threshold value 10A, determine that open-circuit fault occurs.5. continuing to compare each phase current magnitude absolute value with threshold value, and tie
It closes and mechanical angular range is assisted to compare with fault location table, obtain fault location result.When detecting that prior fault is mutually different therewith
Diagnostic result when, record A phase assists all fault diagnosis results occurred 0~2 π of mechanical angle within the scope of, former as multitube
The diagnostic result of barrier.
In the present embodiment, simultaneously open-circuit fault occurs for setting T1, T3 in 2s, and Fig. 7 gives three-phase current amplitude
Testing result detects that the amplitude of A phase current and B phase current is lower than threshold value, is maintained near 0 after the 2s moment, and C phase electricity
Although stream generates distortion, generated without erroneous judgement, A, B phase bridge arm open-circuit fault occur for judgement at this time；When open-circuit fault signal generates
When, fault location is carried out, Fig. 8 gives the variation that A, B phase current magnitude under open-circuit fault assist mechanical angle with A, B phase at this time
Situation carries out fault location according to 1 fault location table of table, obtains the open-circuit fault that positioning result is T1, T3.
Claims (7)
1. a kind of wind electric converter open-circuit fault detection method based on current amplitude, which comprises the steps of:
Step 1 carries out PARK transformation to the three-phase current of motor, obtains the electric angle of three-phase current；
Step 2, the rotor angle according to locating for the electric angle combination initial time motor of three-phase current, determine initial phase
Difference；
Step 3, according to initial phase difference combine current time motor locating for rotor angle, determine that the auxiliary of three-phase current is mechanical
Angle；
Step 4 determines three-phase motor current amplitude according to the auxiliary mechanical angle of three-phase current；
Step 5, according to three-phase motor current amplitude and motor speed, judge whether current transformer breaks down, if breaking down,
Location of fault is determined according to the auxiliary mechanical angle of three-phase current, otherwise continues the monitoring of subsequent time.
2. the wind electric converter open-circuit fault detection method according to claim 1 based on current amplitude, which is characterized in that
The formula of step 1 calculating three-phase current electric angle are as follows:
In formula, ia、ib、icIndicate A, B, C three-phase current, θcIndicate the electric angle of three-phase current, iα、iβIndicate the static seat of two-phase
Mark is lower α, β shaft current.
3. the wind electric converter open-circuit fault detection method according to claim 1 based on current amplitude, which is characterized in that
Step 2 determines the formula of initial phase difference are as follows:
θc=n θr0+θf
In formula, θcIndicate that the electric angle of three-phase current, n indicate the number of pole-pairs of magneto, θr0Indicate initial time motor institute
Locate rotor angle, θfIndicate initial phase difference.
4. the wind electric converter open-circuit fault detection method according to claim 1 based on current amplitude, which is characterized in that
Step 3 calculates the formula of the auxiliary mechanical angle of A, B, C three-phase current are as follows:
θmA=θm
θmB=θm-2/3*π
θmC=θm+2/3*π
In formula, θmA、θmB、θmCIndicate the auxiliary mechanical angle of A, B, C three-phase current, θm=n θr+ θ, θrIndicate the electricity at current time
Rotor angle locating for machine.
5. the wind electric converter open-circuit fault detection method according to claim 1 based on current amplitude, which is characterized in that
Step 4 determines three-phase motor current amplitude method particularly includes: if assisting mechanical angle, θmA、θmB、θmCPositioned at [1.51,1.66]
When [4.60,4.81] section, then enable the current amplitude of corresponding phase for the current amplitude under nominal operating conditions, otherwise, according to
Following formula calculates:
In formula, ima、imb、imcIndicate the amplitude of A, B, C three-phase current, ia、ib、icIndicate A, B, C three-phase current, θmA、θmB、θmC
Indicate the auxiliary mechanical angle of A, B, C three-phase current.
6. the wind electric converter open-circuit fault detection method according to claim 1 based on current amplitude, which is characterized in that
Step 5 carries out current transformer fault diagnosis and location method particularly includes: if motor speed is greater than rotary speed threshold value and certain phase current width
Value is less than current threshold, then judges that current transformer corresponds to the bridge arm generation open-circuit fault of phase, and combine the auxiliary mechanical angle of the phase
Fault location relation table is compared, judges that location of fault, fault location relation table are as follows:
1 fault location relation table of table
In table, ima、imb、imcIndicate the amplitude of A, B, C three-phase current, θmxIndicate the auxiliary mechanical angle of A, B, C three-phase current, x
For A, B, C.
7. the wind electric converter open-circuit fault detection method according to claim 1 based on current amplitude, which is characterized in that
If step 5 is detected simultaneously by multiphase current, amplitude is respectively less than threshold value, records A phase and assists occurring within the scope of 0~2 π of mechanical angle
All fault diagnosis results, using the diagnostic result repeated twice or more as the result of multitube fault diagnosis.
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Cited By (4)
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| CN111983451A (en) * | 2020-08-24 | 2020-11-24 | 宿迁学院 | Open-circuit fault diagnosis method for brushless direct current motor based on stirrer |
| CN112557959A (en) * | 2020-12-29 | 2021-03-26 | 合肥工业大学 | Single-open-circuit fault diagnosis and positioning method for switching tube of direct-drive permanent magnet wind power converter |
| CN112557895A (en) * | 2020-12-16 | 2021-03-26 | 国网江苏省电力有限公司检修分公司 | GIS disconnecting switch fault diagnosis method based on multiple characteristic quantities |
| CN113109688A (en) * | 2021-04-19 | 2021-07-13 | 东南大学 | Thyristor open-circuit fault diagnosis method for excitation system of synchronous phase modulator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112557959B (en) * | 2020-12-29 | 2023-02-24 | 合肥工业大学 | Single-open-circuit fault diagnosis and positioning method for switching tube of direct-drive permanent magnet wind power converter |
| CN113109688A (en) * | 2021-04-19 | 2021-07-13 | 东南大学 | Thyristor open-circuit fault diagnosis method for excitation system of synchronous phase modulator |
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