CN208520978U - A kind of trouble-shooter of three level Cascade H-Bridge Inverters - Google Patents
A kind of trouble-shooter of three level Cascade H-Bridge Inverters Download PDFInfo
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Abstract
The utility model provides a kind of trouble-shooter of three level Cascade H-Bridge Inverters, is related to electric apparatus fault diagnosis technology field.The device controls the normal operation of cascaded inverter, meanwhile, it is attempted by the voltage sensor V of A phase bridge arm clamper pointi1The voltage signal of 3 level Cascade H-Bridge Inverter each unit bridge arm clamper points is acquired with the voltage sensor Vi2 for being attempted by B phase bridge arm clamper point, by the analog input port of voltage signal input A/D chip, by the conversion of A/D chip, the digital signal output end mouth of AD is connect with the I/O port of core controller FPGA, and core controller FPGA handles collected digital signal using voltage of the fault diagnostic program to cascaded inverter bridge arm clamper point；Fault diagnosis result is transmitted to liquid crystal display, real-time display cascaded inverter working condition by I/O port by core controller FPGA.
Description
Technical field
The utility model relates to electric apparatus fault diagnosis technology fields.
Background technique
Three level Cascade H-Bridge Inverters are due to being easy to modularization and facilitating scalability, and harmonic wave of output voltage content is low, reduce
Output inductor, capacitor volume and weight therefore obtained answering extensively in fields such as high-power generations of electricity by new energy
With.However, since cascaded inverter uses more device for power switching, and longtime running is in high pressure, high current and high temperature
State, therefore, cascade system failure rate is higher, and reliability is low.In order to ensure the safe and reliable operation of cascaded inverter, to cascade
The monitoring of inverter state can not only timely debug, and advantageously ensure that the expansion of maintenance personnel's work, reduce grade
Join fault of converter work bring economic loss.
The failure of cascaded inverter device for power switching can be divided into open-circuit fault and short trouble.The event of device for power switching
For barrier mainly due to caused by the mistake of driving signal, the raw failure that most takes place frequently is the short trouble and open circuit of device for power switching
Failure.Since short trouble is difficult to be diagnosed there are the time extremely short (usually within 10us), generally using hardware circuit into
Row handles or is added quick acting fuse and converts open-circuit fault for short trouble, is handled using the diagnostic method of open-circuit fault.
Therefore, the research emphasis of power cell fault diagnosis all concentrates on the open-circuit fault of switching tube at present.Cascaded inverter is opened
When the failure of road, a period of time can be often continued to run, failure is not easy to be noticeable, if system is chronically under open-circuit fault state
Operation often makes other device for power switching that overcurrent occur, further causes overheat and insulation damages, lead to system crash.
Therefore, the open-circuit fault of cascaded inverter device for power switching is also in need of immediate treatment.
Currently, the resultant fault diagnostic method based on converters specifically includes that the side of (1) based on feature extraction
Method extracts characteristic information to converter frequently with the method for mathematic(al) manipulation or signal processing, carries out failure according to characteristic information and examine
It is disconnected.Spectral Analysis Method and wavelet analysis method are most common feature extracting methods.But spectrum analysis and wavelet analysis are in reality
More difficult in the programming realization on border, therefore, the current stage mainly still rests on theory.(2) pattern-recongnition method, being will be modern
Intelligent recognition sorting technique is applied in power electronic technique, has the advantages that versatile, fault diagnosis rate is high.Mode at present
Recognition methods mainly has support vector machines, neural network, expert system approach.(3) analytical model algorithm is to utilize power electronics electricity
The analytic modell analytical model on road seeks residual error, to complete fault diagnosis.But the method for analytic modell analytical model is only applicable to specific circuit, general
Property is poor.It (4) is using when open-circuit fault occurs for some device for power switching in circuit based on the diagnostic method of electric power detection
When, output voltage current signal will generate the signal characteristic of distortion.The distortion that output signal occurs under model according to different faults
Regularity variation is presented, realizes fault diagnosis.
Utility model content
The purpose of the utility model is to provide a kind of trouble-shooters of three level Cascade H-Bridge Inverters, it can effectively be solved
The certainly diagnosis problem of three level Cascade H-Bridge Inverter technical failures.
The purpose of this utility model is achieved through the following technical solutions: a kind of failure of three level Cascade H-Bridge Inverters
Detection device, including three level Cascade H-Bridge Inverters, the specific structure of three level Cascade H-Bridge Inverters are N number of three-level inverter unit
Series connection, the port 1a of unit 1 are connected with the port L of load, and the port 1b of unit 1 is connected with the port 2a of unit 2, unit 2
The port 2b is connected with the port 3a of unit 3, and so on；The port ia of unit i is connected with the port (i-1) b of i-1 unit, single
The port ib of first i is connected with the port (i+1) a of unit i+1, and so on, the port Na of unit N and (N-1) b of unit N-1
Port is connected, and the port Nb of unit N is connected with the load end G, i ∈ [1, N]；To N number of three-level inverter unit A phase bridge arm or B
The clamper point of phase bridge arm simultaneously connects voltage sensor, to realize the status monitoring of all bridge arms of cascaded inverter；It is inverse for three level
The clamper point for becoming device unit i, A phase bridge arm is daiPoint and caiIt puts and meets voltage sensor Vi1, the clamper point of B phase bridge arm is dbiPoint
With cbiIt puts and meets voltage sensor Vi2, i ∈ [1, N]；Core controller FPGA independent operating generates driving signal, driving letter
Number connect with bridge arm device for power switching Sa1, Sa2, Sa3, Sa4, Sb1, Sb2, Sb3 and Sb4 by driving circuit, controls and cascade
The normal operation of inverter；Meanwhile being attempted by the voltage sensor V of A phase bridge arm clamper pointi1Be attempted by B phase bridge arm clamper point
Voltage sensor Vi2The voltage signal for acquiring 3 level Cascade H-Bridge Inverter each unit bridge arm clamper points, which is inputted
The analog input port of A/D chip, by the conversion of A/D chip, the digital signal output end mouth and core controller FPGA of AD
I/O port connection, core controller FPGA by collected digital signal using fault diagnostic program to cascaded inverter bridge arm
The voltage of clamper point is handled；Fault diagnosis result is transmitted to liquid crystal display by I/O port by core controller FPGA,
Real-time display cascaded inverter working condition.
Diagnostic device provided by the utility model need by a kind of method for diagnosing faults of three level Cascade H-Bridge Inverters come
Implement, the device for power switching of the A phase bridge arm in cascaded inverter unit is denoted as Sa1, Sa2, Sa3, Sa4, the function of B phase bridge arm
Rate switching device is denoted as Sb1, Sb2, Sb3, Sb4；Single tube and two-tube open-circuit fault to three level Cascade H-Bridge Inverters are with bridge arm
Basic point is diagnosed, and specific diagnosis algorithm is as follows:
A) it sets in each inverter unit of three level Cascade H-Bridge Inverters, A phase bridge arm is carried with B phase bridge arm using identical frequency
Wave and modulating wave, and A phase bridge arm differs 180 ° with the carrier wave of B phase bridge arm and modulation wave phase；When A phase bridge arm and B phase bridge arm
When device for power switching is in identical operating status, two bridge arm clamp voltage average values are identical；And only carrier wave between concatenation unit
Phase shift π/N, N are concatenation unit number；Due to, when the state of each bridge arm is identical between cascaded inverter unit, cascaded inverter
The clamp voltage average value of any two bridge arm is also identical between unit；Therefore to cascaded inverter each unit A phase bridge arm and B phase bridge arm
Clamper point installation voltage sensor is acquired fault message；
B) to the voltage analysis of cascaded inverter unit bridge arm clamper point, using bridge arm as basic point, by bridge arm power switch
The state of device is divided into three classes: one, device for power switching is normal；Two, same in Sx1 and Sx4 simultaneous faults or Sx2 and Sx3
When failure in the case where, be defined as I class failure；Three, or Sx2 failure corresponding with Sx4 failure and Sx3 failure pair in Sx1 failure
Answer, Sx1 and Sx2 simultaneous faults is corresponding with Sx3 and Sx4 simultaneous faults or Sx1 and Sx3 simultaneous faults and Sx2 and Sx4 simultaneously therefore
Hinder in corresponding situation, is defined as II class failure；Wherein, x value a or b, the spy for having average value different because of every kind of fault type
It levies, there is the identical feature of average value, without having between corresponding fault type between corresponding two kinds of fault types
The different feature of average value, the clamp voltage of malfunction and normal condition to totally ten kinds of fault types of three types is full
Average value is calculated under modulation degree, and clamper electricity is corresponded to by modulating wave positive half cycle to the type of two kinds of failures corresponding in II class failure
The calculated result that pressing mean value and modulating wave negative half period correspond to clamp voltage average value is compared, and by comparison result and is calculated
To average value be stored in controller as Mishap Database；Define the device for power switching letter of cascaded inverter unit bridge arm
Number are as follows:
uaFor modulating wave, according to the device for power switching function of cascaded inverter unit bridge arm, if tpFor p switch state
Switch to+o switch state time point；t+o- o switch state time point is switched to for+o switch state；t-oIt is cut for-o switch state
Shift to n switch state time point；tnThe time point of p switch state is switched to for n switch state；Calculate clamp voltage average value
Are as follows:
The corresponding clamp voltage average value of modulating wave positive half cycle are as follows:
The corresponding clamp voltage average value of modulating wave negative half period are as follows:
Wherein, mfFor carrier wave ratio, for the upper bound of summing, j=1 is summation lower bound, and T is modulation wave period, VcdIt (t) is clamper point
Voltage real value, Vcd_meanFor clamp voltage average value, Vcd_mean_PFor the corresponding clamp voltage average value of modulating wave positive half cycle,
Vcd_mean_NFor the corresponding clamp voltage average value of modulating wave negative half period；
C) by being measured in real time to clamp voltage, average value degree of the being modulated reduction that will be calculated first, i.e.,
The modulation degree of the average value being calculated and cascaded inverter is made into division arithmetic, full modulation degree is corresponding flat under reduction to the state
Mean value；Secondly, all fault datas in the later average value of reduction and system failure database are successively made division arithmetic progress
Normalized, and consider mean value calculation error, sets the upper limit as 1.1, the threshold value that lower limit is 0.9；It is obtained when normalization
When numerical value belongs to I class failure, that is, shows that bridge arm is in a certain specific malfunction in I class failure, export fault diagnosis result；When
It is flat further according to the corresponding clamp voltage of positive half period in a modulation wave period when numerical value that normalization obtains belongs to II class failure
The comparison result of mean value clamp voltage average value corresponding with negative half-cycle, corresponding two kinds in calling system Mishap Database
The expection comparison result of type fault further diagnoses two kinds of failures corresponding in II class fault type, obtains and export
Fault diagnosis result.
Compared with prior art, the significant gain effect of the utility model is:
1, compared with hardware diagnostic, average calculation method only needs to increase voltage sensor in existing cascaded inverter system
Device, therefore for existing operating system without increasing complicated circuit structure, change is smaller, and cost is relatively low；
2, compared with other software diagnosis methods, such as neural network, this method calculation amount is small, and entire grade is contacted
The system lower clamp voltage to bridge arm that need to only nonserviceable carries out mean value calculation and establishes Mishap Database, can be completed whole
A cascaded inverter system is diagnosed by all single tubes of unit and two-tube open-circuit fault of bridge arm；
3, only to bridge arm clamp voltage real-time detection and calculate average value, can be realized cascaded inverter it is online in real time therefore
Barrier diagnosis.
4, the clamp voltage of each bridge arm of three level Cascade H-Bridge Inverters can be monitored by the device, and by the state of each bridge arm
Data are shown on display screen, convenient for checking the state of cascaded inverter.
Detailed description of the invention
Fig. 1 is three level Cascade H-Bridge Inverter topological structure applied by the utility model.
Fig. 2 is the utility model trouble-shooter structural block diagram.
Specific embodiment
A kind of trouble-shooter of three level Cascade H-Bridge Inverter provided by the utility model, including the cascade of three level are inverse
Become device, the specific structure of three level Cascade H-Bridge Inverters as shown in Figure 1 is the series connection of N number of three-level inverter unit, the 1a of unit 1
Port is connected with the port L of load, and the port 1b of unit 1 is connected with the port 2a of unit 2, the port 2b and the unit 3 of unit 2
The port 3a is connected, and so on；The port ia of unit i is connected with the port (i-1) b of i-1 unit, the port ib of unit i and list
The port (i+1) a of first i+1 is connected, and so on, the port Na of unit N is connected with the port (N-1) b of unit N-1, unit N's
The port Nb is connected with the load end G, i ∈ [1, N]；Simultaneously to the clamper point of N number of three-level inverter unit A phase bridge arm or B phase bridge arm
Voltage sensor is connect, to realize the status monitoring of all bridge arms of cascaded inverter；For three-level inverter unit i, A phase bridge arm
Clamper point be daiPoint and caiIt puts and meets voltage sensor Vi1, the clamper point of B phase bridge arm is dbiPoint and cbiIt puts and connects voltage biography
Sensor Vi2(LV25-P), [1, N] i ∈；Its fault diagnosis frame diagram is as shown in Fig. 2, firstly, core controller FPGA
(CoreEP4CE10) independent operating generates driving signal, and the driving signal is passed through driving circuit and bridge arm power switch device
Part Sa1, Sa2, Sa3, Sa4, Sb1, Sb2, Sb3 are connected with Sb4, control the normal operation of cascaded inverter；Meanwhile being attempted by A
The voltage sensor V of phase bridge arm clamper pointi1With the voltage sensor V for being attempted by B phase bridge arm clamper pointi2It is for acquiring three electricity
The voltage signal of flat cascaded inverter each unit bridge arm clamper point, by the analog quantity of voltage signal input A/D chip (AD7606)
Input port, by the conversion of A/D chip, the digital signal output end mouth of AD is connect with the I/O port of core controller FPGA, core
Heart controller FPGA is by collected digital signal using fault diagnostic program to the voltage of cascaded inverter bridge arm clamper point
It is handled；Fault diagnosis result is transmitted to liquid crystal display (Risym by I/O port by core controller FPGA
LCD12864), real-time display cascaded inverter working condition.
Claims (1)
1. a kind of trouble-shooter of three level Cascade H-Bridge Inverters, including three level Cascade H-Bridge Inverters, three level cascade inversion
The specific structure of device is the series connection of N number of three-level inverter unit, and the port 1a of unit 1 is connected with the port L of load, unit 1
The port 1b is connected with the port 2a of unit 2, and the port 2b of unit 2 is connected with the port 3a of unit 3, and so on；The ia of unit i
Port is connected with the port (i-1) b of i-1 unit, and the port ib of unit i is connected with the port (i+1) a of unit i+1, with such
It pushing away, the port Na of unit N is connected with the port (N-1) b of unit N-1, and the port Nb of unit N is connected with the load end G, i ∈ [1,
N]；It is characterized by: clamper point to N number of three-level inverter unit A phase bridge arm and B phase bridge arm and voltage sensor is connect, with
Realize the status monitoring of all bridge arms of cascaded inverter；Clamper point for three-level inverter unit i, A phase bridge arm is daiPoint
With caiIt puts and meets voltage sensor Vi1, the clamper point of B phase bridge arm is dbiPoint and cbiIt puts and meets voltage sensor Vi2, i ∈ [1,
N]；Core controller FPGA independent operating generates driving signal, which passes through driving circuit and bridge arm power switch device
Part Sa1, Sa2, Sa3, Sa4, Sb1, Sb2, Sb3 are connected with Sb4, control the normal operation of cascaded inverter；Meanwhile being attempted by A
The voltage sensor V of phase bridge arm clamper pointi1With the voltage sensor V for being attempted by B phase bridge arm clamper pointi2Acquire the cascade of three level
The voltage signal of inverter each unit bridge arm clamper point passes through the analog input port of voltage signal input A/D chip
The digital signal output end mouth of the conversion of A/D chip, AD is connect with the I/O port of core controller FPGA, core controller FPGA
Collected digital signal is handled using voltage of the fault diagnostic program to cascaded inverter bridge arm clamper point；Core
Fault diagnosis result is transmitted to liquid crystal display, real-time display cascaded inverter working condition by I/O port by controller FPGA.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108872882A (en) * | 2018-08-09 | 2018-11-23 | 西南交通大学 | A kind of trouble-shooter and its diagnostic method of three level Cascade H-Bridge Inverters |
| CN110058111A (en) * | 2019-04-22 | 2019-07-26 | 浙江万里学院 | T-type three-level inverter method for diagnosing faults based on phase voltage residual error |
| CN110308341A (en) * | 2019-05-09 | 2019-10-08 | 阳光电源股份有限公司 | Inverter module detection method in energy conversion system, apparatus and system |
| CN110365046A (en) * | 2019-07-16 | 2019-10-22 | 中天昱品科技有限公司 | A kind of three-level inverter driving device |
-
2018
- 2018-08-09 CN CN201821278371.6U patent/CN208520978U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108872882A (en) * | 2018-08-09 | 2018-11-23 | 西南交通大学 | A kind of trouble-shooter and its diagnostic method of three level Cascade H-Bridge Inverters |
| CN108872882B (en) * | 2018-08-09 | 2023-09-19 | 西南交通大学 | Fault diagnosis device and method for three-level cascading inverter |
| CN110058111A (en) * | 2019-04-22 | 2019-07-26 | 浙江万里学院 | T-type three-level inverter method for diagnosing faults based on phase voltage residual error |
| CN110058111B (en) * | 2019-04-22 | 2021-01-15 | 浙江万里学院 | Fault diagnosis method for T-type three-level inverter based on phase voltage residual errors |
| CN110308341A (en) * | 2019-05-09 | 2019-10-08 | 阳光电源股份有限公司 | Inverter module detection method in energy conversion system, apparatus and system |
| CN110308341B (en) * | 2019-05-09 | 2021-09-03 | 阳光电源股份有限公司 | Inversion module detection method, device and system in energy conversion system |
| CN110365046A (en) * | 2019-07-16 | 2019-10-22 | 中天昱品科技有限公司 | A kind of three-level inverter driving device |
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Effective date of registration: 20230921 Address after: No. 719, 7th Floor, Building 7, No. 666 Jinfenghuang Avenue, Jinniu High tech Industrial Park, Chengdu, Sichuan Province, 610000 Patentee after: Chengdu Tuoje Xingtong Technology Co.,Ltd. Address before: Room 044, Floor 1, Building 1, No. 170, Tianhuan Road, Rongdu Avenue, Jinniu District, Chengdu, Sichuan 610000 Patentee before: Chengdu Lixing Enterprise Management Center (L.P.) Patentee before: Chengdu Tuoje Xingtong Technology Co.,Ltd. Patentee before: He Xiaoqiong |