CN106405307B - One kind floating ground interleaved converter single tube open-circuit fault detection method - Google Patents
One kind floating ground interleaved converter single tube open-circuit fault detection method Download PDFInfo
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- CN106405307B CN106405307B CN201610756182.4A CN201610756182A CN106405307B CN 106405307 B CN106405307 B CN 106405307B CN 201610756182 A CN201610756182 A CN 201610756182A CN 106405307 B CN106405307 B CN 106405307B
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- G—PHYSICS
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- 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
Abstract
The present invention provides the floating ground interleaved converter single tube open-circuit fault detection method of one kind, four phases of acquisition floatingly staggeredly in Boost two capacitor both ends voltage, the voltage difference of two capacitors is compared with each threshold value of setting；Switch tube S1 and S3 apply low level driving respectively, acquire the voltage difference that low level driving applies the front and back both ends capacitor C1 and C2 respectively, are compared with the threshold value of setting.The present invention Boost that can interlock to four phase floating-points realizes the fault detection of single switching transistor open-circuit fault, and is pin-pointed to specific breakdown switch pipe.Algorithm of the invention is simply easily realized, without increasing additional hardware, reduces fault detection cost.
Description
Technical field
The present invention relates to a kind of converter switches pipe fault detection methods, and in particular to a kind of four phases staggeredly Boost floatingly
Converter single tube open-circuit fault detection method.
Background technique
Under the fossil energy increasingly background of scarcity, renewable and clean energy resource is developed, advanced efficient using energy source is used
Technology becomes the strategy that various countries first develop.Photovoltaic and fuel cell are considered as most potential new energy, especially
It is fuel cell, the features such as because of efficiency with higher, low noise and without exhaust emission, it has also become the hot spot of research.Either
Photovoltaic or fuel cell, output be all low-voltage and high-current direct current, and output voltage is with load disturbance
And change, C-V characteristic presents apparent non-linear.It is therefore desirable to adjust photovoltaic by switching power converters
Or output characteristic of fuel cell, it is automobile DC load or inverter power supply.And the switching tube of supply convertor may open a way or
Person's short trouble has significantly over-voltage or overcurrent, is easy to carry out fault detection and protection when short trouble occurs, and opens
Road failure not will lead to system closedown, but converter long-term work may cause secondary failure in abnormality.
There are many traditional converter switches pipe fault detection methods.A kind of method is by directly measuring switching tube source-
Drain voltage realizes that the method for open-circuit fault detection is simple and effective, versatile, but needs to increase sensor and filter circuit.Separately
A kind of more general method is to obtain magnetic element voltage by increasing ancillary coil, according to patrolling for inductive drop and driving signal
Collect the open circuit and short trouble detection and diagnosis of relational implementation switching device.The above fault detection and diagnosis principle has two big
Defect: first is that current sample frequency is excessively high；Second is that fault diagnosis accuracy depends greatly on ripple size, ripple is got over
Greatly, identification accuracy is higher.But for fuel cells applications, ripple is crossed conference and is damaged to fuel cell pack, shadow
Ring its service life.
In conclusion existing document and patent are generally required when detecting converter switches pipe failure using additional device
Or sensor, increase the cost of fault detection.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of detection of floating ground interleaved converter single tube open-circuit fault
Method, the Boost that can interlock floatingly for four phases that fuel cell electric vehicle uses carry out open-circuit fault detection.
The technical solution adopted by the present invention to solve the technical problems includes the following steps:
Step 1, four phases of acquisition floatingly staggeredly in Boost two capacitor both ends voltage VC1、VC2；
Step 2, by the voltage difference Δ V=V of two capacitorsC2-VC1Absolute value and setting threshold value k1It is compared,
When | Δ V | < k1When, switching tube sets 0 without open-circuit fault, fault flag F0；When | Δ V | > k1When, switching tube is faulty, failure
Flag bit F0 sets 1, executes step 3；
Step 3, will | Δ V | the threshold value k with setting2It is compared, when | Δ V | < k2When, it breaks down but not steady again
Fixed, post-fault stable flag bit F1 sets 0, returns to step one；When | Δ V | > k2When, it breaks down and stable again, failure
Stable flag bit F1 sets 1 afterwards, executes step 4；
The threshold value k of step 4, Δ V and setting3It is compared, as Δ V <-k3When, upper and lower module fault flag F2 sets 0,
Execute step 5；As Δ V > k3When, upper and lower module fault flag F2 sets 1, executes step 6；
Switching tube S1 driving signal is changed to low level driving by step 5, and the duration is 0.5 millisecond, acquires and just starts
Inject the voltage at the low level driving both ends moment capacitor C1The voltage V' at the both ends capacitor C1 after with 0.5 millisecondC1, the two
Difference is denoted as Δ V1, threshold value k with setting4It is compared, as Δ V1< k4When, witness marker position F3 sets 0, position-sensing switch pipe S1
Failure, as Δ V1> k4When, witness marker position F3 sets 1, position-sensing switch pipe S2 failure；
Switching tube S3 driving signal is changed to low level driving by step 6, and the duration is 0.5 millisecond, acquires and just starts
Inject the voltage at the low level driving both ends moment capacitor C2The voltage V' at the both ends capacitor C2 after with 0.5 millisecondC2, the two
Difference is denoted as Δ V2, threshold value k with setting4It is compared, as Δ V2< k4When, position-sensing switch pipe S3 failure, Δ V2> k4When, it is fixed
Bit switch pipe S4 failure.
The threshold valueWherein, Vin、VoutInterlock floatingly for four phases
Boost input, output voltage；The threshold valueThe threshold value k3=5%Vout；Institute
The threshold value stated
The beneficial effects of the present invention are: the Boost that can interlock to four phase floating-points realizes the event of single switch tube open circuit
The fault detection of barrier, and it is pin-pointed to specific breakdown switch pipe.Algorithm of the invention is simply easily realized, additional without increasing
Hardware, reduce fault detection cost.
Detailed description of the invention
Fig. 1 be four phases floatingly interlock Boost topological structure；
Fig. 2 is switching tube S1The waveform diagram of capacitance voltage when breaking down；
Fig. 3 is converter switches pipe fault detection flow chart；
Fig. 4 is switching tube S1Simulation result diagram when breaking down；
Fig. 5 is switching tube S2Simulation result diagram when breaking down；
Fig. 6 is switching tube S3Simulation result diagram when breaking down；
Fig. 7 is switching tube S4Simulation result diagram when breaking down；
In figure；, S1~S4For first to fourth switching tube, D1~D4Freewheeling diode, L1~L4For inductance, C1And C2Position
Filter capacitor, RLFor load resistance, input voltage Vin, output voltage Vout。
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples, and the present invention includes but are not limited to following implementations
Example.
The present invention provides a kind of method based on the interleaved converter single tube open-circuit fault detection of four phases floating ground, including walks as follows
It is rapid:
Step 1: the voltage V at acquisition capacitor both endsC1、VC2With converter input, output voltage Vin、Vout；
Step 2: by the voltage difference Δ V=V of two capacitorsC2-VC1Absolute value and setting threshold value k1It is compared,
Judge whether there is the generation of switching tube open-circuit fault.When | Δ V | < k1When, fault-free, fault flag F0 sets 0, when | Δ V | > k1
When, faulty, fault flag F0 sets 1, executes step 3；
Step 3: | Δ V | the threshold value k with setting2It is compared, when | Δ V | < k2When, it breaks down but unstable again,
Post-fault stable flag bit F1 sets 0, returns to step one, when | Δ V | > k2When, it breaks down and stable again, after failure
Stablize flag bit F1 and set 1, executes step 4；
Step 4: the threshold value k of Δ V and setting3It is compared, as Δ V <-k3When, upper and lower module fault flag F2 sets 0,
Step 5 is executed, as Δ V > k3When, upper and lower module fault flag F2 sets 1, executes step 6；
Step 5: being changed to low level driving for switching tube S1 driving signal, and the duration is 0.5 millisecond, acquires and just starts
Inject the voltage at the low level driving both ends moment capacitor C1The voltage V' at the both ends capacitor C1 after 0.5 millisecondC1, the difference of the two
Value is denoted as Δ V1, threshold value k with setting4It is compared, as Δ V1< k4When, witness marker position F3 sets 0, Δ V1> k4When, positioning
Flag bit F3 sets 1, by table 1, positions the switching tube to break down；
Step 6: being changed to low level driving for switching tube S3 driving signal, and the duration is 0.5 millisecond, acquires and just starts
Inject the voltage at the low level driving both ends moment capacitor C2The voltage V' at the both ends capacitor C2 after 0.5 millisecondC2, the difference of the two
Value is denoted as Δ V2, threshold value k with setting4It is compared, as Δ V2< k4When, witness marker position F3 sets 0, Δ V2> k4When, positioning
Flag bit F3 sets 1, by table 1, positions the switching tube to break down.
Table 1
Remarks: × indicate that value is -1,0 and 1.
Fig. 1 be four phase of the present invention floatingly staggeredly Boost topology diagram.
Fig. 2 is the waveform diagram of capacitance voltage when switching tube S1 breaks down, and at t=0.1 seconds, analog switch pipe was opened
Road failure, before t=0.1 seconds, converter normally starts and works, and at t=0.1 seconds, converter entered fault mode.It is whole
A circuit uses inductive current Balance route strategy, i.e., when circuit works normally, four L1~L4Electric current it is equal, opened when one
When closing pipe open-circuit fault occurs, the corresponding inductive current of remaining three switching tubes keeps identical.
For the ease of analysis, Boost that four phases are interlocked floatingly is divided into two modules up and down, S1、S2、C1For upper mold
Block, S3、S4、C2For lower module.When the converter works normally, capacitor C1、C2Upper voltage waveform having the same；When the transformation
When open-circuit fault occurs for device switching tube, capacitor C will lead to1、C2Voltage is no longer identical.Due to using closed-loop control, switching tube failure
When, capacitor C1、C2Voltage will be stabilized to new value quickly respectively.The part that capacitance voltage reduces is that switching tube occurs to open
The position of road failure, to a switching tube (S of the part1Or S3) injection the short time low level drive signal, judge to correspond to
The variation of capacitance voltage.During injecting low level drive signal, if the position capacitance voltage is constant, by injection low level
The switching tube failure of driving signal, conversely, another switching tube failure of the module.
Fig. 3 is the flow chart of switching tube single channel fault detection.
The method being averaged by multiple repairing weld reduces the error of sampling.When circuit works normally, capacitance voltage are as follows:
When a switching tube breaks down, failure lateral capacitance voltage are as follows:
Capacitance voltage without switching tube open-circuit fault side are as follows:
IfThat is fault lateral capacitance voltage.
For the ease of analysis, four flag bits, respectively F0, F1, F2 and F3 are set.
F0: setting Δ V=VC2-VC1, for judging VC2With VC1Between size relation.In view of the ripple of voltage, choose
One threshold value k1It is the 10% of faulty component capacitance voltage.It can release:
When | Δ V | < k1When, F0=0, converter works normally；When | Δ V | > k1When, F0=1, converter breaks down；
F1: whether decision circuitry reaches stable state again.In view of the ripple of voltage, a threshold value k is chosen2To break down
The 95% of capacitance voltage difference afterwards can be released:
The initial value of F1 is -1, represents circuit normal work.Work as F0=1, and | Δ V | < k2When, F1=0, indication circuit hair
Raw failure but not up to stable state；When | Δ V | > k2When, F1=1 represents circuit and reaches stable state again.
F2: for judging that upper module or lower module break down.
Selected k3=5%Vout,
F2=-1, circuit work normally；F1=0, upper module failure；F1=1, circuit lower module failure.
F3: break down which switching tube of module of decision circuitry breaks down.When converter breaks down, Δ is set
V3To start to inject failure lateral capacitance voltage when low level driving and the capacitance voltage difference after a period of time, it is contemplated that voltage
Ripple, choose a threshold value k3It is 5% of capacitance voltage difference after breaking down.It can release:
The initial value of F3 is -1, the flag bit worked normally for circuit.Work as F0=1, F2=1, and Δ V1> k4Or Δ V2
> k4When, F3=1 indicates S2 S4 failure；Conversely, F3=0, indicates S1 S3 failure.
The switching tube to break down can be thus positioned by the state of F0, F1, F2 and F3, specific judgment mode is such as
Shown in table 1.
In conjunction with table 1 provide as a result, designing flow chart shown in Fig. 2.The specific implementation method of the fault detection can be divided into
For following eight kinds of states:
[1] 0 ××× of state: circuit works normally；
[2] 10 ×× of state: circuit occurs open-circuit fault but is not up to stable state again；
[3] state 11-1 ×: circuit malfunctions, but cannot judge fault type, into looping to determine next time；
[4] state 11 × -1: circuit malfunctions, but cannot judge fault type, into looping to determine next time；
[5] state 1100: switching tube S1Open-circuit fault occurs.VC1< VC2, converter upper module failure, to S1It injects low
When level disturbs, failure lateral capacitance voltage VC1Do not change；
[6] state 1101: switching tube S2Open-circuit fault occurs.VC1< VC2, converter upper module failure, to S1It injects low
When level disturbs, failure lateral capacitance voltage VC1Variation；
[7] state 1110: switching tube S3Open-circuit fault occurs.VC1> VC2, converter lower module failure, to S3It injects low
When level disturbs, failure lateral capacitance voltage VC2Do not change；
[8] state 1111: switching tube S4Open-circuit fault occurs.VC1> VC2, converter lower module failure, to S3It injects low
When level disturbs, failure lateral capacitance voltage VC2Variation.
Claims (1)
1. one kind floating ground interleaved converter single tube open-circuit fault detection method, it is characterised in that include the following steps:
Step 1, four phases of acquisition floatingly staggeredly in Boost two capacitor both ends voltage VC1、VC2；
Step 2, by the voltage difference Δ V=V of two capacitorsC2-VC1Absolute value and setting threshold value k1It is compared, when | Δ
V | < k1When, switching tube sets 0 without open-circuit fault, fault flag F0；When | Δ V | > k1When, switching tube is faulty, Reflector
Position F0 sets 1, executes step 3；
Step 3, will | Δ V | the threshold value k with setting2It is compared, when | Δ V | < k2When, it breaks down but unstable again, therefore
Stablize flag bit F1 after barrier and set 0, returns to step one；When | Δ V | > k2When, it breaks down and stable again, it is steady after failure
Determine flag bit F1 and set 1, executes step 4；
The threshold value k of step 4, Δ V and setting3It is compared, as Δ V <-k3When, upper and lower module fault flag F2 sets 0, executes
Step 5；As Δ V > k3When, upper and lower module fault flag F2 sets 1, executes step 6；
Switching tube S1 driving signal is changed to low level driving by step 5, and the duration is 0.5 millisecond, and acquisition just starts to inject
The voltage at the low level driving both ends moment capacitor C1The voltage V' at the both ends capacitor C1 after with 0.5 millisecondc1, the difference of the two
It is denoted as Δ V1, threshold value k with setting4It is compared, as Δ V1< k4When, witness marker position F3 sets 0, position-sensing switch pipe S1 failure,
As Δ V1> k4When, witness marker position F3 sets 1, position-sensing switch pipe S2 failure；
Switching tube S3 driving signal is changed to low level driving by step 6, and the duration is 0.5 millisecond, and acquisition just starts to inject
The voltage at the low level driving both ends moment capacitor C2The voltage V' at the both ends capacitor C2 after with 0.5 millisecondc2, the difference of the two
It is denoted as Δ V2, threshold value k with setting4It is compared, as Δ V2< k4When, position-sensing switch pipe S3 failure, Δ V2> k4When, positioning is opened
Close pipe S4 failure；
The threshold valueWherein, Vin、VoutFor four phases floatingly interlock Boost
Converter input, output voltage；The threshold valueThe threshold value k3=5%Vout；Described
Threshold value
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| CN111175604B (en) * | 2020-01-09 | 2021-02-26 | 中南大学 | LLC resonant converter fault diagnosis method based on resonant capacitor voltage |
| CN111983420B (en) * | 2020-09-01 | 2023-06-27 | 南通大学 | Single-tube open-circuit fault diagnosis method based on three-phase silicon controlled rectifier voltage regulating circuit |
| CN112285607B (en) * | 2020-09-25 | 2021-08-10 | 华南理工大学 | Single-tube open-circuit fault diagnosis method of open-winding electric drive system based on predictive control |
| CN114035119B (en) * | 2021-10-14 | 2024-01-26 | 上海电力大学 | Method for detecting open-circuit faults of direct-current capacitor and power device of three-level Buck-Boost converter |
| CN117614256B (en) * | 2024-01-24 | 2024-03-22 | 西北工业大学 | Input current ripple optimization method after floating interleaved converter faults |
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