CN112782493A - Converter module function detection device and method - Google Patents
Converter module function detection device and method Download PDFInfo
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- CN112782493A CN112782493A CN201911070453.0A CN201911070453A CN112782493A CN 112782493 A CN112782493 A CN 112782493A CN 201911070453 A CN201911070453 A CN 201911070453A CN 112782493 A CN112782493 A CN 112782493A
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Abstract
The invention discloses a function detection device and a function detection method for a converter module, which comprise a power supply module, a signal switching unit and a signal detection unit, wherein the output end of the power supply module is connected with the input end and the output end of the converter module to be detected through the signal switching unit and is used for switching paths of voltage output by the power supply module so that the voltage can be loaded at the input end or/and the output end of the converter to be detected; the input end of the signal detection unit is connected with the input end and the output end of the converter module to be detected, and the signal detection unit is used for detecting input signals and output signals of the converter to be detected and judging the detection signals to determine whether the converter has faults or not. The function detection device and the function detection method for the converter module have the advantages of simple structure, safety, reliability, small occupied area, simplicity and convenience in operation, accurate fault location and the like.
Description
Technical Field
The invention mainly relates to the technical field of converter testing, in particular to a converter module function detection device and method.
Background
The traction converter on the rail train is an electric energy conversion component which rectifies alternating current into direct current and then inverts the direct current into alternating current, or directly inverts the direct current into the alternating current, and the alternating current output by the electric energy conversion component is sent to a traction motor on the train to provide an energy source for the operation of the motor, so that the train is driven to operate.
As a core component in rail train power systems. The operation and safety of the train are directly influenced by the function of the traction converter. Therefore, in order to guarantee the normal and stable functions of the traction converter, the detection and maintenance of the converter are indispensable works.
The traction converter on the train consists of: the converter comprises a converter cabinet body, a converter module, a power switch device, a capacitor, a connector, a bus and the like, wherein the converter module is a core component in a converter product, a high-voltage test is usually adopted for a detection test of the converter product, the high-voltage test mainly simulates an actual working condition, a high-voltage power supply is supplied to the converter to be detected according to the requirement of actual power, and various electrical properties of the converter in a high-voltage state are checked, which is usually used for a delivery test of the product; since the traction converter is a high-power component on the train, the power of a single converter often reaches dozens of kVA or even hundreds of kVA, so if the traction converter is subjected to high-voltage test according to a conventional method, a series of problems are caused:
1) the problem of certain potential safety hazard exists in the detection process of the high-voltage test of the converter;
if the current transformer is tested according to a conventional high-voltage test method, the direct-current voltage at the input end of the current transformer is generally between hundreds of volts (such as DC750V) and thousands of volts (such as DC4000V) A, which brings certain potential safety hazard.
2) High-power test equipment (including field and power supply problems) needs to be provided in the detection process of the field converter; particularly, the conventional high-voltage and high-power detection scheme is applied to on-site maintenance, needs test equipment to provide a high-power supply, a load and other power devices, occupies a large field space, has requirements on the power supply capacity of a test field, consumes large resources, causes high detection test cost, and seriously affects the detection efficiency of the converter.
3) The converter needs to be disassembled when being detected;
because detection equipment is bulky in the conventional detection scheme, heavy in weight, inconvenient in power supply (the system supplies power to AC380V, and power is high) and the like, detection equipment is inconvenient to move, so when the current transformer needs to be detected, the current transformer (or the core module inside the current transformer) needs to be detached from a train, the current transformer is transported to a test site where the detection equipment is located to detect, the current transformer (or the core module) is reinstalled to the train after the detection is finished, the test efficiency is influenced to a certain extent, and certain product dismounting risks can be brought.
4) The detection of a freewheeling diode in the converter module is difficult;
the freewheeling diode used in the converter module circuit has a forward function (approximate short circuit) and a reverse function (approximate open circuit), and if the converter module is detected according to a conventional detection method, the converter module can only detect whether the reverse function (approximate open circuit) is good or bad: because when the voltage is normally input to the input end of the converter module according to the conventional detection scheme, and then the output signal of the converter module is detected, even if the detection result is normal, the situation that the freewheeling diode connected with the switching element in parallel is not short-circuited can only be explained, and if the freewheeling diode is open-circuited, the situation cannot be directly judged. And the conventional method is usually performed by using the diode detection function of a multimeter in a manual mode to detect whether the forward function of the freewheeling diode is normal or not. The detection scheme is not only low in efficiency, but also not beneficial to automatic generation of a test report, and has certain influence on the objectivity of a detection result.
5) The fault of the converter module cannot be accurately positioned;
the conventional converter detection scheme can only comprehensively detect whether the converter has good or bad functions, and can not carry out more accurate positioning detection on fault positions. When the converter module normally works, the module itself can usually detect the system state (generally, fault state) and feed back the system state to the control unit, but the information is often rough, and only a certain phase fault (such as "a-phase fault") can be prompted, and more accurate fault location cannot be performed, and the actual fault reason may be an IGBT device, a pulse driving unit, a pulse conditioning unit, or even the control unit itself (interference of a high-voltage environment may bring a certain influence on the accuracy of the detection result of the control unit).
Besides the high-voltage test method, a low-voltage test method can be tried in the field of converter test, and the conventional test method is as follows: the tested object is connected with a low-voltage main circuit power supply, such as DC24V, then the on-off of the IGBT is controlled through a simple manual operation switch signal, and the signal lamp is observed to judge whether the tested object is normal. Because the manual operation switch signal is a fixed high-low level signal, the response characteristic of the IGBT to the frequency switch signal cannot be checked; moreover, the low-voltage test method can only detect the reverse characteristic (i.e. whether short circuit exists) of the freewheeling diode, but cannot directly detect the forward characteristic (i.e. whether open circuit exists) of the freewheeling diode, and has more or less problems.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides the converter module function detection device and method which are simple in structure, safe, reliable, small in occupied space and simple and convenient to operate.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a function detection device for a converter module comprises a power supply module, a signal switching unit and a signal detection unit, wherein the output end of the power supply module is connected with the input end and the output end of the converter module to be detected through the signal switching unit and is used for switching paths of voltage output by the power supply module so that the voltage can be loaded at the input end or/and the output end of the converter to be detected; the input end of the signal detection unit is connected with the input end and the output end of the converter module to be detected, and the signal detection unit is used for detecting input signals and output signals of the converter to be detected and judging the detection signals to determine whether the converter has faults or not.
As a further improvement of the above technical solution:
the output voltage of the power supply module is DC 12-48V.
The power module is a power supply with an overcurrent protection function, and an output end of the power module is connected with an indicator lamp in parallel.
The signal switching unit comprises a switch KN1-KN7, the positive electrode of the power supply module is connected with the input P end of the converter module to be tested through KN4 and KN1 in sequence, and the negative electrode of the power supply module is connected with the input N end of the converter module to be tested through KN 3; one end of KN2 is connected with the connection point between KN1 and KN4, and the other end of KN2 is connected with the N end; one end of the KN2 is connected with each phase output end of the converter module to be tested through the KN5, the KN6 and the KN7 respectively.
The invention correspondingly discloses a detection method based on the converter module function detection device, which comprises an input and output function detection method of a converter module to be detected, and comprises the following steps:
1) the power supply module inputs a forward power supply to the input end of the converter module to be tested through the signal switching unit;
2) applying a control signal meeting the operation time sequence requirement to each switching element in the converter module to be tested;
3) the signal detection unit detects output signals of all phases of the converter module to be detected, judges whether the output signals of all phases are consistent with the control signals, and judges that the converter module to be detected is normal if the output signals of all phases are consistent with the control signals; otherwise, judging the fault of the converter module to be tested, and analyzing the fault type according to the phase, amplitude, frequency and duty ratio of each phase output signal.
As a further improvement of the above technical solution:
the method for detecting the follow current two-flow tube in the converter module to be detected comprises the following steps:
a1, the power supply module inputs reverse power supply to the input end of the converter module to be tested through the signal switching unit;
a2, detecting the voltage of the output end and the voltage of the input end of each phase of the converter module to be detected;
a3, comparing the voltage of the output end of each phase with the voltage of the input end, and judging whether the corresponding freewheeling diode has faults or not according to the comparison value.
The signal switching unit comprises a switch KN1-KN7, the positive electrode of the power supply module is connected with the input P end of the converter module to be tested through KN4 and KN1 in sequence, and the negative electrode of the power supply module is connected with the input N end of the converter module to be tested through KN 3; one end of KN2 is connected with the connection point between KN1 and KN4, and the other end of KN2 is connected with the N end; one end of the KN2 is connected with the output end of each phase of the converter module to be tested through the KN5, the KN6 and the KN7 respectively; the detailed steps corresponding to steps a1-a3 are:
a01, closing KN2 and KN4, disconnecting other switches, inputting a reverse power supply to the input end of the converter module to be tested by the power supply module through the signal switching unit, connecting the N end of the converter module to be tested with the positive end of the power supply module, and suspending the P end;
a02, detecting the voltage of each phase output end and the voltage of P end of the converter module to be detected;
a03, comparing the output end voltage and the input end voltage of each phase; when the output end voltage of each phase does not satisfy: and if the P terminal voltage < the output terminal voltage of each phase < the N terminal voltage, judging that the freewheeling diode of the corresponding phase has open-circuit fault.
The method for detecting the freewheeling diode in the converter module to be detected comprises the following steps:
b1, the power supply module inputs power supply to the output end of the converter module to be tested through the signal switching unit;
b2, detecting the voltage of the output end and the voltage of the input end of each phase of the converter module to be detected;
b3, comparing the voltage of the output end of each phase with the voltage of the input end, and judging whether the corresponding freewheeling diode has faults or not according to the comparison value.
The signal switching unit comprises a switch KN1-KN7, the positive electrode of the power supply module is connected with the input P end of the converter module to be tested through KN4 and KN1 in sequence, and the negative electrode of the power supply module is connected with the input N end of the converter module to be tested through KN 3; one end of KN2 is connected with the connection point between KN1 and KN4, and the other end of KN2 is connected with the N end; one end of the KN2 is connected with the output end of each phase of the converter module to be tested through the KN5, the KN6 and the KN7 respectively; the detailed steps corresponding to steps b1-b3 are:
b01, closing switches KN4 and KN2, and then closing the switches KN5, KN6 and KN7 in sequence, wherein the power supply module inputs power to output ends of all phases of the converter module to be tested in sequence through the signal switching unit, the N end of the converter module to be tested is connected with the positive end of the power supply module, and the P end of the converter module to be tested is suspended;
b02, sequentially detecting the voltage of the output end and the voltage of the input end of each phase of the converter module to be detected;
b03, comparing the voltage of each phase output end with the voltage of each phase input end: when the output end voltage of each phase does not satisfy: and (4) judging that the voltage-P point of the output end of each phase is equal to the forward voltage drop of the freewheeling diode, and judging that the corresponding freewheeling diode has an open circuit.
The detection method of the control circuit comprises the following steps: and replacing the control unit, the pulse conditioning unit and the pulse driving unit in the control circuit one by one, and judging the corresponding replaced unit fault when the fault is eliminated after replacement.
The control signal of the step 2) is a frequency signal.
Compared with the prior art, the invention has the advantages that:
(1) the detection device and the method are simultaneously suitable for factory test and field overhaul and maintenance of the converter module, are particularly suitable for field overhaul and maintenance, can replace a conventional high-voltage test scheme to a certain extent, and have absolute advantages in the aspects of cost, safety, power supply requirements, use convenience, detection efficiency and the like in comparison with the high-voltage test scheme; in the factory test process, the detection device and the method can be adopted to carry out low-voltage test on the converter module, and then high-voltage test is carried out under the condition that the low-voltage test is normal, so that the functional state of a tested product can be pre-judged in advance, and the unpredictable phenomenon in the high-voltage test process is avoided; in the process of overhauling and maintaining the converter module on the application site, the necessity of a high-voltage test is greatly reduced, and the low-voltage test can be directly carried out on the converter module by adopting the detection device and the detection method.
(2) The detection device and the detection method have the advantages that the detection equipment is small in size and light in weight (belongs to portable equipment) due to low voltage and low power, the equipment can be directly transported to the position close to the converter to be detected, and the converter module is directly detected, so that the test efficiency is high, and the dismounting risk of the converter module can be greatly reduced; and the low-voltage detection device has low overall power, does not need to prepare a high-power supply and occupy larger site space, and has lower cost and energy consumption.
(3) According to the detection device and method, the switching level signal in the conventional low-voltage test method is replaced by the frequency signal, the switching frequency response performance of the IGBT can be detected more comprehensively, the test result (normal or fault) and the specific fault phenomenon (such as stuck fault, switching jitter and the like) can be automatically judged through test waveform comparison, and deep fault analysis of the IGBT is facilitated;
(4) the detection device and the detection method can carry out comprehensive automatic detection on the functions of the freewheeling diode, including open circuit and short circuit, and are more comprehensive and higher in automation degree compared with the conventional detection scheme;
(5) the detection device and the detection method can accurately position and detect the fault, and reduce the difficulty of the detection of the converter module and the daily maintenance cost of the converter module.
Drawings
Fig. 1 is a main circuit topology diagram of a current transformation module to be tested according to the present invention.
Fig. 2 is one of block configuration diagrams of a control circuit in the present invention.
FIG. 3 is a second block diagram of the control circuit of the present invention.
FIG. 4 is a diagram of an embodiment of the detecting device of the present invention.
FIG. 5 is a schematic diagram of the detection of the pulse conditioning unit in the control circuit according to the present invention.
Detailed Description
The invention is further described below with reference to the figures and the specific embodiments of the description.
The function detection device for the converter module is suitable for detecting each converter module in a traction converter installed on a rail train, is also suitable for detecting the converter module before leaving a factory, and is particularly suitable for field maintenance. The following description will be given taking a three-phase converter module as an example (the detection apparatus and method itself is not limited by the number of phases of the converter module, and is also applicable to detection of a single-phase converter module or a four-phase converter module, etc.):
as shown in fig. 1, the main circuit of a three-phase converter module comprises A, B, C three phases, each of which is composed of two upper and lower switching elements (e.g., IGBT elements) and a freewheeling diode connected in parallel. P, N is a DC voltage input terminal, and L1, L2 and L3 are AC three-phase output terminals.
As shown in fig. 2, the control circuit of the three-phase converter module is shown in the dashed frame portion in fig. 2, and the control unit at the front end is often included in the converter product, but not in the converter module: the front-end control unit is responsible for generating an IGBT original control pulse, level conversion, protection function design and the like are carried out on the pulse through a pulse conditioning unit circuit, then the pulse is supplied to the pulse driving unit for signal driving capability matching conversion, and finally a control signal is sent to the IGBT, so that the IGBT is controlled to be switched on and switched off.
In addition to the structure shown in fig. 2, the control circuit shown in fig. 3 is also provided, which is different in that the control unit in fig. 3 includes a pulse conditioning function, that is, only a pulse driving function is provided in the converter module control circuit, and even the pulse conditioning unit and the pulse driving unit are designed as one unit and are put together in the module control circuit.
As shown in fig. 4, the function detecting device for a converter module of this embodiment includes a power module, a signal switching unit and a signal detecting unit, wherein an output end of the power module is connected to an input end and an output end of the converter module to be detected through the signal switching unit, and is configured to perform path switching on a voltage output by the power module so that the voltage can be arbitrarily loaded on the input end or/and the output end of the converter to be detected; the input end of the signal detection unit is connected with the input end and the output end of the converter module to be detected, and is used for detecting input signals and output signals of the converter to be detected and judging the detection signals to determine whether the converter has faults or not.
In this embodiment, the power module is a power supply with an overcurrent protection function, the output voltage of the power module is DC12-48V, and the output end of the power module is connected in parallel with an indicator light LED 0. Specifically, the power supply module preferably adopts a DC24V power supply, and as the power supply of the detection device, the power supply module has an overcurrent protection function, the LED0 is used for indicating the DC24 power supply, when a full bridge arm of the converter module to be detected, such as an a bridge arm, a B bridge arm or a C bridge arm, is short-circuited, the LED0 will turn off the light, otherwise, the LED0 keeps on normally. Of course, the output voltage of the power module is not limited, and the output voltages with different sizes can be adopted according to actual requirements on the site.
As shown in fig. 4, in this embodiment, the signal switching unit includes switches KN1-KN7, the positive electrode of the power supply module is connected to the input P terminal of the converter module to be tested through KN4 and KN1 in sequence, and the negative electrode of the power supply module is connected to the input N terminal of the converter module to be tested through KN 3; one end of KN2 is connected with the connection point between KN1 and KN4, and the other end of KN2 is connected with the N end; one end of the KN2 is connected with each phase output end of the converter module to be tested through the KN5, the KN6 and the KN7 respectively, specifically, the KN5 is connected with the L1, the KN6 is connected with the L2, and the KN7 is connected with the L3. The signal switching unit has a simple structure and is easy and convenient to operate, and can enable a power supply to be loaded to the P terminal, the N terminal, the L1 terminal, the L2 terminal or the L3 terminal at will, wherein the P terminal, the N terminal, the L1 terminal, the L2 terminal or the L3 terminal is not only a signal applying point but also a signal detecting point.
The invention correspondingly discloses a detection method based on the converter module function detection device, which comprises an input and output function detection method of a converter module to be detected, and comprises the following steps:
1) the power supply module inputs a forward power supply to the input end of the converter module to be tested through the signal switching unit;
2) applying a control signal (frequency signal) meeting the operation time sequence requirement to each switch element in the converter module to be tested;
3) the signal detection unit detects output signals of all phases of the converter module to be detected, judges whether the output signals of all phases are consistent with the control signals, and judges that the converter module to be detected is normal if the output signals of all phases are consistent with the control signals; otherwise, judging the fault of the converter module to be tested, and analyzing the fault type according to the phase, amplitude, frequency and duty ratio of each phase output signal.
Specifically, when the converter module actually works normally, the main circuit input voltage of the converter module is hundreds of volts to thousands of volts, the detection device provides DC24V (or other voltage values) for the tested three-phase converter module as the main circuit input voltage, and if the tested module has no short circuit of a certain bridge arm, the LED0 is kept normally on. The method for testing the input and output functions in the low-voltage mode specifically comprises the following steps (some protection functions in the normal high-voltage working state of the module are forced or shielded through software and hardware):
sequentially closing KN4, KN1 and KN3, and applying a DC24V power supply to a main circuit of the converter module;
then, applying a control signal meeting the three-phase operation time sequence requirement to the IGBT of the converter module to enable the IGBT to normally operate in a low-voltage mode (such as DC24V), and then detecting output signals L1, L2 and L3 of the converter module and displaying the waveform through PC application software of an upper computer; wherein the control signal can select single level signal or pulse signal with different voltage amplitude or frequency according to requirement, and the frequency can cover the whole range of the product (such as 0-2000 Hz);
meanwhile, software is used for automatically comparing signals, and judging whether the phase, amplitude, frequency and duty ratio of output signals are consistent with control signals or not, so that whether faults such as clamping, switching action delay, shaking, single-tube open circuit, single-tube short circuit and the like exist in the IGBT of the module during switching action is obtained, the accurate fault phenomenon of the IGBT is given, the fault judgment can be intuitively carried out by observing a oscillogram, and finally, a test report can be automatically generated.
The input and output function test in the low-voltage mode is the most important test of the converter module, and if the test function item is normal, the control unit, the pulse conditioning unit, the pulse driving unit and the IGBT basic function of the tested module can be judged to be normal.
Because the main circuit input voltage of the converter module is DC24V low voltage, and the output end of the converter module is no-load, the total power (including the control circuit power) of the detection device is about tens of watts, and the detection device has the advantages of small volume, light weight, low cost and convenient use. Of course, in other embodiments, the appropriate load may be added according to actual requirements.
In this embodiment, the method for detecting the freewheeling diode in the converter module to be detected is further included, and is used for detecting the open circuit of the freewheeling diode, and specifically includes the steps of:
a1, the power supply module inputs reverse power supply to the input end of the converter module to be tested through the signal switching unit;
a2, detecting the voltage of the output end and the voltage of the input end of each phase of the converter module to be detected;
a3, comparing the voltage of the output end of each phase with the voltage of the input end, and judging whether the corresponding freewheeling diode has faults or not according to the comparison value.
Specifically, in conjunction with the signal switching unit shown in FIG. 4, the detailed steps corresponding to steps a1-a3 are:
a01, closing KN2 and KN4 through PC application software of an upper computer, disconnecting other switches, inputting a reverse power supply to the input end of the converter module to be tested through a signal switching unit by a power supply module, connecting the N end of the converter module to be tested with the positive end of the power supply module, and suspending the P end;
a02, detecting the voltage of each phase output end and the voltage of P end of the converter module to be detected;
a03, comparing the output end voltage and the input end voltage of each phase; when the output end voltage of each phase does not satisfy: the voltage of the P-terminal < the voltage of the output terminal of each phase (L1, L2, and L3) < the voltage of the N-terminal, it is determined that the freewheeling diode of the corresponding phase has an open-circuit fault.
In another embodiment, the method for detecting the open circuit of the freewheeling diode may further include:
b1, the power supply module inputs power supply to the output end of the converter module to be tested through the signal switching unit;
b2, detecting the voltage of the output end and the voltage of the input end of each phase of the converter module to be detected;
b3, comparing the voltage of the output end of each phase with the voltage of the input end, and judging whether the corresponding freewheeling diode has faults or not according to the comparison value.
Specifically, in conjunction with the signal switching unit shown in FIG. 4, the detailed steps corresponding to steps b1-b3 are:
b01, closing switches KN4 and KN2, and then closing the switches KN5, KN6 and KN7 in sequence, wherein the power supply module inputs power to output ends of all phases of the converter module to be tested in sequence through the signal switching unit, the N end of the converter module to be tested is connected with the positive end of the power supply module, and the P end of the converter module to be tested is suspended;
b02, sequentially detecting the voltage of the output end and the voltage of the input end of each phase of the converter module to be detected;
b03, comparing the voltage of each phase output end with the voltage of each phase input end: when the output end voltage of each phase does not satisfy: when the voltage at the output end of each phase-point P is equal to the forward voltage drop of the freewheeling diode, the freewheeling diode on the upper arm of the corresponding phase is judged to be open.
Of course, the switching and detection of the switches are automatically executed by PC software, and the automation degree is high.
In this embodiment, the method further includes a detection method of the control circuit, which is used to accurately locate the fault, and specifically includes: and replacing the control unit, the pulse conditioning unit and the pulse driving unit in the control circuit one by one, and judging the corresponding replaced unit fault when the fault is eliminated after replacement.
Specifically, when the above scheme is used to detect the converter module, if the detection result indicates that any phase fails, the fault point needs to be further detected in a positioning manner, and the detection principle is as follows:
because the converter module comprises a main circuit and a control circuit, a detection system is provided with a functional circuit (such as a pulse conditioning board in fig. 5) similar to each unit (pulse conditioning unit, pulse driving unit, etc.) in the control circuit, if it is required to detect whether the fault cause is in the pulse conditioning unit, the pulse conditioning unit is only required to be replaced by the pulse conditioning board, and the pulse conditioning board is used to send a control signal to the rear-end pulse driving unit and receive a state feedback signal of the pulse driving unit. If the function detection result of the converter module is recovered to be normal after replacement, the fault reason is in the pulse conditioning unit, otherwise, the fault reason is in other links. By adopting the method to carry out the same detection on the pulse driving unit, whether the fault reason exists in the pulse driving unit can be further judged, otherwise, the fault reason exists in the IGBT device.
The detection device and the method are simultaneously suitable for factory test and field overhaul and maintenance of the converter module, are particularly suitable for field overhaul and maintenance, can replace a conventional high-voltage test scheme to a certain extent, and have absolute advantages in the aspects of cost, safety, power supply requirements, use convenience, detection efficiency and the like in comparison with the high-voltage test scheme; in the factory test process, the detection device and the method can be adopted to carry out low-voltage test on the converter module, and then high-voltage test is carried out under the condition that the low-voltage test is normal, so that the functional state of a tested product can be pre-judged in advance, and the unpredictable phenomenon in the high-voltage test process is avoided; in the process of overhauling and maintaining the converter module on the application site, the necessity of a high-voltage test is greatly reduced, and the low-voltage test can be directly carried out on the converter module by adopting the detection device and the detection method.
The detection device and the detection method have the advantages that the detection equipment is small in size and light in weight (belongs to portable equipment) due to low voltage and low power, the equipment can be directly transported to the position close to the converter to be detected, and the converter module is directly detected, so that the test efficiency is high, and the dismounting risk of the converter module can be greatly reduced; and the low-voltage detection device has low overall power, does not need to prepare a high-power supply and occupy larger site space, and has lower cost and energy consumption.
According to the detection device and method, the switching level signal in the conventional low-voltage test method is replaced by the frequency signal, the switching frequency response performance of the IGBT can be detected more comprehensively, the test result (normal or fault) and the specific fault phenomenon (such as stuck fault, switching jitter and the like) can be automatically judged through test waveform comparison, and deep fault analysis of the IGBT is facilitated;
the detection device and the detection method can carry out comprehensive automatic detection on the functions of the freewheeling diode, including open circuit and short circuit detection, and are more comprehensive and higher in automation degree compared with the conventional detection scheme;
the detection device and the detection method can accurately position and detect the fault, and reduce the difficulty of the detection of the converter module and the daily maintenance cost of the converter module.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (11)
1. The function detection device of the converter module is characterized by comprising a power supply module, a signal switching unit and a signal detection unit, wherein the output end of the power supply module is connected with the input end and the output end of the converter module to be detected through the signal switching unit and is used for switching the path of the voltage output by the power supply module so that the voltage can be loaded at the input end or/and the output end of the converter to be detected; the input end of the signal detection unit is connected with the input end and the output end of the converter module to be detected, and the signal detection unit is used for detecting input signals and output signals of the converter to be detected and judging the detection signals to determine whether the converter has faults or not.
2. The converter module function detecting device according to claim 1, wherein the output voltage of the power supply module is DC 12-48V.
3. The function detection device of the converter module as claimed in claim 2, wherein the power module is a power supply with overcurrent protection function, and an indicator lamp is connected in parallel to the output end of the power module.
4. The function detection device of the converter module as claimed in claim 1, 2 or 3, wherein the signal switching unit comprises switches KN1-KN7, the positive pole of the power supply module is connected with the input P end of the converter module to be tested through KN4 and KN1 in sequence, and the negative pole of the power supply module is connected with the input N end of the converter module to be tested through KN 3; one end of KN2 is connected with the connection point between KN1 and KN4, and the other end of KN2 is connected with the N end; one end of the KN2 is connected with each phase output end of the converter module to be tested through the KN5, the KN6 and the KN7 respectively.
5. A detection method based on the function detection device of the converter module as claimed in any one of claims 1 to 4, characterized in that the method for detecting the input and output functions of the converter module to be detected comprises the following steps:
1) the power supply module inputs a forward power supply to the input end of the converter module to be tested through the signal switching unit;
2) applying a control signal meeting the operation time sequence requirement to each switching element in the converter module to be tested;
3) the signal detection unit detects output signals of all phases of the converter module to be detected, judges whether the output signals of all phases are consistent with the control signals, and judges that the converter module to be detected is normal if the output signals of all phases are consistent with the control signals; otherwise, judging the fault of the converter module to be tested, and analyzing the fault type according to the phase, amplitude, frequency and duty ratio of each phase output signal.
6. The method for detecting the freewheeling diode according to claim 5, further comprising a method for detecting the freewheeling diode in the converter module to be detected, comprising the steps of:
a1, the power supply module inputs reverse power supply to the input end of the converter module to be tested through the signal switching unit;
a2, detecting the voltage of the output end and the voltage of the input end of each phase of the converter module to be detected;
a3, comparing the voltage of the output end of each phase with the voltage of the input end, and judging whether the corresponding freewheeling diode has faults or not according to the comparison value.
7. The detection method according to claim 6, wherein the signal switching unit comprises switches KN1-KN7, the positive pole of the power supply module is connected with the input P end of the converter module to be detected through KN4 and KN1 in sequence, and the negative pole of the power supply module is connected with the input N end of the converter module to be detected through KN 3; one end of KN2 is connected with the connection point between KN1 and KN4, and the other end of KN2 is connected with the N end; one end of the KN2 is connected with the output end of each phase of the converter module to be tested through the KN5, the KN6 and the KN7 respectively; the detailed steps corresponding to steps a1-a3 are:
a01, closing KN2 and KN4, disconnecting other switches, inputting a reverse power supply to the input end of the converter module to be tested by the power supply module through the signal switching unit, connecting the N end of the converter module to be tested with the positive end of the power supply module, and suspending the P end;
a02, detecting the voltage of each phase output end and the voltage of P end of the converter module to be detected;
a03, comparing the output end voltage and the input end voltage of each phase; when the output end voltage of each phase does not satisfy: and if the P terminal voltage < the output terminal voltage of each phase < the N terminal voltage, judging that the freewheeling diode of the corresponding phase has open-circuit fault.
8. The detection method according to claim 5, further comprising a detection method of a freewheeling diode in the converter module to be tested, comprising the steps of:
b1, the power supply module inputs power supply to the output end of the converter module to be tested through the signal switching unit;
b2, detecting the voltage of the output end and the voltage of the input end of each phase of the converter module to be detected;
b3, comparing the voltage of the output end of each phase with the voltage of the input end, and judging whether the corresponding freewheeling diode has faults or not according to the comparison value.
9. The detection method according to claim 8, wherein the signal switching unit comprises switches KN1-KN7, the positive pole of the power supply module is connected with the input P end of the converter module to be detected through KN4 and KN1 in sequence, and the negative pole of the power supply module is connected with the input N end of the converter module to be detected through KN 3; one end of KN2 is connected with the connection point between KN1 and KN4, and the other end of KN2 is connected with the N end; one end of the KN2 is connected with the output end of each phase of the converter module to be tested through the KN5, the KN6 and the KN7 respectively; the detailed steps corresponding to steps b1-b3 are:
b01, closing switches KN4 and KN2, and then closing the switches KN5, KN6 and KN7 in sequence, wherein the power supply module inputs power to output ends of all phases of the converter module to be tested in sequence through the signal switching unit, the N end of the converter module to be tested is connected with the positive end of the power supply module, and the P end of the converter module to be tested is suspended;
b02, sequentially detecting the voltage of the output end and the voltage of the input end of each phase of the converter module to be detected;
b03, comparing the voltage of each phase output end with the voltage of each phase input end: when the output end voltage of each phase does not satisfy: and (4) judging that the voltage-P point of the output end of each phase is equal to the forward voltage drop of the freewheeling diode, and judging that the corresponding freewheeling diode has an open circuit.
10. The detection method according to any one of claims 5 to 9, further comprising a detection method of a control circuit, comprising: and replacing the control unit, the pulse conditioning unit and the pulse driving unit in the control circuit one by one, and judging the corresponding replaced unit fault when the fault is eliminated after replacement.
11. The detection method according to any one of claims 5 to 9, wherein the control signal of step 2) is a frequency signal.
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