CN107340444B - Voltage ride-through test system and method - Google Patents
Voltage ride-through test system and method Download PDFInfo
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- CN107340444B CN107340444B CN201710639396.8A CN201710639396A CN107340444B CN 107340444 B CN107340444 B CN 107340444B CN 201710639396 A CN201710639396 A CN 201710639396A CN 107340444 B CN107340444 B CN 107340444B
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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
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Abstract
A voltage ride through test system for rapidly switching operating voltages to test the operating performance of a frequency converter in transient overvoltage and low voltage, comprising: the output end of the adjustable transformer is provided with 5 taps, and 5 voltages with different amplitudes are respectively led out; the tapping switch comprises 8 input ends and an output end, wherein the 8 input ends are connected with 5 taps of the output end of the adjustable transformer; the frequency converter is connected with the tapping switch; the adjustable load is connected with the frequency converter and is adjusted according to different output voltages of the frequency converter; the control recorder is respectively connected with the adjustable transformer, the tapping switch, the frequency converter and the adjustable load, controls the working states of the adjustable transformer, the tapping switch and the frequency converter, and collects voltage and current waveforms and switch protection action signals input and output by the frequency converter. The invention ensures the safe, reliable and efficient normal operation of the power plant frequency converter and avoids shutdown accidents.
Description
Technical Field
The invention relates to the field of power grid control, in particular to a voltage ride through test system and a voltage ride through test method.
Background
With the great implementation of the national energy saving policy, auxiliary machine systems of the thermal power plant are transformed into a large number of converters so as to reduce the station power consumption of the unit. However, the low voltage ride through capability of auxiliary frequency converters of most thermal power generating units is not verified at present, and some auxiliary frequency converters even do not have the low voltage ride through capability, so that the problem that the generator set jumps due to instantaneous voltage fluctuation of a power grid occurs; as the frequency converter is not subjected to the low voltage ride through function test, once voltage drop or over-high occurs, the frequency converter can trigger protection of low voltage, over-current and the like, so that the frequency converter is locked and output, for the high voltage frequency converter, supply is an important auxiliary machine, and once the frequency converter is locked, the shutdown of the important auxiliary machine can finally lead to the tripping accident of the unit.
At present, coal feeding, powder feeding machine, preheater and air cooling fan systems of coal powder furnaces of thermal power plants become equipment with the largest application of frequency converters, particularly frequency converters for controlling the output of the coal feeding, powder feeding machine, preheater and air cooling fan, and once low voltage occurs, protection actions often cause faults such as shutdown of important auxiliary machines and tripping of units. In the actual use process, when the power grid breaks down or the spare power automatic switching is carried out, the low-voltage protection of the frequency converter acts when the plant power voltage is instantaneously or temporarily lower than the low-voltage protection setting value of the frequency converter (the value is different according to the type of the frequency converter), the plant power and the low-voltage protection setting value of the bus of the frequency converter are usually lower than the low-voltage protection setting value of the frequency converter, other equipment in the plant power system still normally works, once the frequency converter is protected and locked, the auxiliary machine stops operating and working, the shutdown and furnace shutdown faults can be caused, great economic loss is brought to the power plant, the problem is one of the frequent reasons of the power plant tripping accident, meanwhile, the problem of relatively large power plant is solved at present, and the safe, reliable and efficient normal operation of the power plant can be ensured only well, and the shutdown and furnace shutdown accident is avoided.
Disclosure of Invention
The invention aims to provide a voltage ride through test system and a voltage ride through test method, which are applied to the low voltage ride through capability of a frequency converter.
A voltage ride through test system for rapidly switching operating voltages to test the operating performance of a frequency converter in overvoltage and low voltage, comprising:
the output end of the adjustable transformer is provided with 5 taps, and 5 voltages with different amplitudes are respectively led out;
the tapping switch comprises 8 input ends and an output end, wherein the tapping switch is controlled by a manual or program controller, one of the 8 input ends is selected to be connected to the output end, and the 8 input ends are connected with 5 taps of the output end of the adjustable transformer;
the frequency converter is connected with the adjustable transformer and the output end of the tapping switch;
the adjustable load is connected with the frequency converter, and the size of the adjustable load is adjusted according to different output values of the frequency converter;
the control recorder is respectively connected with the adjustable transformer, the tapping switch and the frequency converter, controls the working states of the adjustable transformer, the tapping switch and the frequency converter, and collects voltage and current waveforms and switch protection action signals input and output by the frequency converter (3).
The voltage ride through test system comprises a plurality of series resistive loads, a plurality of series inductive loads and a fan, wherein the plurality of resistive loads and the plurality of inductive loads are respectively provided with a plurality of taps, the selection of the taps is changed according to the voltage and the frequency of the frequency converter, and the loads are regulated in a constant magnetic flux v/f control mode; the fan is used for fine adjustment of inductive load to compensate for load adjustment neutral gear; the fan also assists in dissipating heat from the adjustable load.
In the voltage ride through test system, the 5 taps of the adjustable transformer respectively output 20% U, 60% U, 90% U, 100% U and 130% U, wherein U represents the rated voltage of the frequency converter.
The voltage crossing test system comprises 8 input ends of the tapping switch, wherein the voltage values are 130% U, 100% U, 90% U, 100% U, 60% U, 100% U, 20% U and 100% U in sequence.
The above-mentioned voltage ride through test system, wherein, the control recorder still contains:
the central controller is used for controlling the working state of the whole system in a centralized way;
the input end of the compression storage module is connected with the central controller, and the compression storage module exchanges stored data and stores the data in time;
the output end of the data acquisition module is connected with the central controller and the compression storage module, and acquires voltage, current and frequency information in the system;
the waveform analysis module is used for recording the information acquired by the data acquisition module in real time, drawing waveforms, and carrying out calculation measurement and analysis on the waveforms;
the display module is connected with the central controller and used for displaying waveforms and command keys;
and the printing module is connected with the central controller and outputs a paper report.
In the voltage crossing test system, the data acquisition module adopts 8 isolation channels and a 16-bit high-speed A/D converter.
The voltage crossing test system comprises a compression storage module and a mobile storage module, wherein the compression storage module comprises a local storage module and a mobile storage module, the local storage module is connected with the data acquisition module and the mobile storage module, and the mobile storage module comprises 2 USB interfaces for connecting external mobile storage equipment.
The voltage crossing test system comprises a waveform analysis module and a parameter calculation module, wherein the waveform analysis module comprises a waveform recording module and a parameter calculation module, the waveform recording module is connected with a central controller and the parameter calculation module, and the parameter calculation module is connected with the central controller.
The voltage ride through test method includes the following steps that a control recorder controls a tapping switch to sequentially switch different voltages and record data at the same time:
s1, the output end of the tapping switch is arranged at the 8 th input end, the output voltage is 100% U, and U represents the rated voltage of the frequency converter;
s2, the output end of the tapping switch (2) is switched to the 1 st input end, the output voltage is 130% U, and the holding time is 0.5 seconds;
s3, the output end of the tapping switch (2) is switched to the 2 nd input end, the output voltage is 100% U, and when the frequency converter (3) operates stably, the working state of the frequency converter (3) is read;
s4, switching the output end of the tapping switch (2) to the 3 rd input end, wherein the output voltage is 90% U, the holding time is longer than 5 seconds, and reading the working state of the frequency converter (3) when the frequency converter (3) operates to be stable;
s5, the output end of the tapping switch (2) is switched to the 4 th input end, the output voltage is 100% U, and when the frequency converter (3) operates stably, the working state of the frequency converter (3) is read;
s6, the output end of the tapping switch (2) is switched to the 5 th input end, the output voltage is 60% U, and the holding time is 5 seconds;
s7, the output end of the tapping switch (2) is switched to the 6 th input end, the output voltage is 100% U, and when the frequency converter (3) operates stably, the working state of the frequency converter (3) is read;
s8, the output end of the tapping switch (2) is switched to the 7 th input end, the output voltage is 20% U, and the tapping switch is kept for 0.5 seconds;
s9, the output end of the tapping switch (2) is switched to the 8 th input end, the output voltage is 100% U, and when the frequency converter (3) operates stably, the working state of the frequency converter (3) is read;
s10, the control recorder judges whether the frequency converter operates normally and records all test parameters and waveforms, and if a certain item fails to be tested in the test process, the next test item is directly entered;
and S11, the control recorder evaluates the low voltage ride through capability of the tested system and generates an analysis report.
The invention has the advantages and beneficial effects that:
(1) Ensuring the safe, reliable and efficient normal operation of the power plant.
(2) Preventing the tripping of the unit or the fire extinguishment of the boiler, and causing unplanned shutdown accidents.
Drawings
Fig. 1 is a device connection diagram of the present invention.
Fig. 2 is a block diagram of a control recorder in the present invention.
Fig. 3 is a flow chart of control software for controlling a recorder in the present invention.
Detailed Description
The invention will be further described by the following detailed description of a preferred embodiment, taken in conjunction with the accompanying drawings.
As shown in fig. 1, a power plant is connected to an adjustable transformer 1, the adjustable transformer 1 switches the power voltage to different voltage values, and a tapping switch 2 selects and switches the power voltage to output the voltage value required by the test to a frequency converter 3. The control recorder 4 controls the switching process and records the data and analysis performance, eventually giving a report.
A voltage crossing test system for rapidly switching working voltage and testing working performance of a frequency converter 3 in overvoltage and low voltage comprises an adjustable transformer 1, a tapping switch 2, the frequency converter 3, an adjustable load 5 and a control recorder 4. The input channels and the output channels of the instrument are isolated from each other, so that the system to be tested is prevented from being broken down due to the connection problem of different potential points in the test.
The output end of the adjustable transformer 1 is provided with 5 taps, and 5 voltages with different amplitudes are respectively led out;
the tapping switch 2 comprises 8 input ends and an output end, wherein the tapping switch is controlled by a manual or program controller, one of the 8 input ends is selected to be connected to the output end, and the 8 input ends are connected with 5 taps of the output end of the adjustable transformer 1;
the frequency converter 3 is connected with the adjustable transformer 1 and the tapping switch 2;
the adjustable load 5 is connected with the frequency converter 3, and the size of the adjustable load 5 is adjusted according to different output values of the frequency converter 3;
the control recorder 4 is respectively connected with the adjustable transformer 1, the tapping switch 2 and the frequency converter 3, and the control recorder 4 controls the working states of the adjustable transformer 1, the tapping switch 2 and the frequency converter 3 and collects the voltage and current information of the output end of the adjustable transformer 1 and the input end of the frequency converter 3. After the test is finished, the voltage, current, frequency and power change conditions of the power supply side and the load side of the test sample are recorded, transient signals are recorded, and voltage waveforms in the test process are stored. And evaluating the low voltage ride through capability of the variable frequency speed regulating system according to the running condition of the equipment and the stored voltage waveform in the test process, and automatically generating an analysis report.
Further, the adjustable load 5 comprises a plurality of series resistive loads, a plurality of series inductive loads and a fan, wherein the plurality of resistive loads and the plurality of inductive loads are respectively provided with a plurality of taps, the selection of the taps is changed according to the voltage and the frequency of the frequency converter 3, and the load is regulated according to a constant magnetic flux v/f control mode; the fan is used for fine adjustment of inductive load to compensate for load adjustment neutral gear; the fan also assists in dissipating heat from the adjustable load 5.
The adjustable load 5 is a high-voltage large-capacity analog load, and the highest bearable load voltage is 10kV. By changing the series-parallel state of the resistive load and the inductive load, different types of loads are simulated. The method is used for simulating the actual load with the capacity of 300kVA-3000kVA and the power factor of 0.7-0.9.
The resistance load module is formed by connecting high-temperature-resistant special alloy stainless steel resistors. The stainless steel resistor tube is made of nickel-chromium-aluminum resistor wire stainless steel heating wires, so that the stability of the load resistor is ensured.
The fan adopts a 6kV fan with the power of 300kVar as the fine adjustment of inductive load to compensate the neutral gear adjustment between 0 and 300 kVar; the fan also assists the load in the box body to dissipate heat, and the function of preventing the load from overheating is achieved.
The fan sets up protect function and has:
overvoltage protection: when the input voltage of the load exceeds the warning value, alarming and automatically unloading;
short circuit and overcurrent protection: the load circuit is provided with a breaker, and is automatically unloaded when the short circuit or the current is overlarge;
and (3) temperature protection: when the load temperature exceeds the warning value, alarming and unloading manually or automatically;
and (3) wind pressure protection of a fan: when the air quantity of any fan is insufficient, unloading is automatically carried out, and an alarm is given;
fan safety protection: when the fan has mechanical or electrical faults, the load is automatically unloaded for protection;
emergency stop: the loading can be forced by manual one-key unloading, and the loading can not be carried out in the emergency stop locking state;
phase sequence protection: when the load phase sequence is in error, the automatic switching can be realized.
The whole adjustable load 5 is arranged in a container, the container body is resistant to high temperature, cold, sun, rain, moisture, salt mist, dust and corrosion, and mildew, and the surface paint of the container body is marine paint, so that the normal container coating level is achieved.
Further, the 5 taps of the adjustable transformer 1 output 20%, 60%, 90%, 100% and 130% U, respectively, where U represents the rated voltage of the frequency converter 3.
Further, the voltage values of 130% u, 100% u, 90% u, 100% u, 60% u, 100% u, 20% u and 100% u are sequentially connected to the 8 input terminals of the tap changer 2.
Further, as shown in fig. 2, the control recorder 4 further includes a central controller 41, a compression storage module 42, a data acquisition module 43, a waveform analysis module 44, and a printing module 46.
A central controller 41 for centrally controlling the operation state of the whole system;
the input end of the compression storage module 42 is connected with the central controller 41, exchanges stored data and stores the data in time;
the output end of the data acquisition module 43 is connected with the central controller 41 and the compression storage module 42, and acquires voltage, current and frequency information in the system;
the waveform analysis module 44 records the information acquired by the data acquisition module 43 in real time, draws waveforms, and performs calculation measurement and analysis on the waveforms;
the display module 45 is connected with the central controller 41, selects a large color screen for displaying the waveforms of the current voltage, current and frequency in real time, and selects a touch screen for facilitating the operation of instruction keys of a tester;
the printing module 46 is connected to the central controller 41 and outputs a paper report.
Further, the data acquisition module 43 employs an 8-channel, 16-bit high-speed a/D converter. The voltage signal acquisition error is less than 0.2V; the current signal acquisition error is less than 0.02mA; the frequency measurement error is <0.01Hz.
Further, the compression storage module 42 includes a local storage module and a mobile storage module, the local storage module is connected with the data acquisition module 43 and the mobile storage module, and the mobile storage module includes 2 USB interfaces for connecting to an external mobile storage device.
Further, the waveform analysis module 44 includes a waveform recording module and a parameter calculation module, the waveform recording module is connected with the central controller 41 and the parameter calculation module, and the parameter calculation module is connected with the central controller 41.
As shown in fig. 3, during the test, the control recorder 4 controls the output voltage sag value and time of the adjustable transformer 1 through the tapping switch 2, the data acquisition module 43 acquires data, the waveform analysis module 44 records waveforms, and the central controller 41 determines the test state. After the test is completed, the operator uses the waveform analysis and statistics tool, the graphic drawing tool, the waveform combination operation tool, the effective value calculation, the power calculation, and the phasor diagram tool in the waveform analysis module 44 to check and analyze the recorded data. The test data and the analysis result can be used for generating a WORD/EXCEL form test report, and can also be derived by generating a JPG picture through software. The test report automatically marks the curve, so that the test report is completely and automatically manufactured. The template for the test can be preset in the instrument, so that a tester can conveniently complete measurement and recording of test data, and test parameters in the test template are automatically calculated.
The voltage ride through test method comprises the following steps that a control recorder 4 controls a tapping switch 2 to sequentially switch different voltages and record data at the same time:
s1, the output end of the tapping switch 2 is arranged at the 8 th input end, the output voltage is 100% U, wherein U represents the rated voltage of the frequency converter 3;
s2, the output end of the tapping switch (2) is switched to the 1 st input end, the output voltage is 130% U, and the holding time is 0.5 seconds;
s3, the output end of the tapping switch (2) is switched to the 2 nd input end, the output voltage is 100% U, and when the frequency converter (3) operates stably, the working state of the frequency converter (3) is read;
s4, switching the output end of the tapping switch (2) to the 3 rd input end, wherein the output voltage is 90% U, the holding time is longer than 5 seconds, and reading the working state of the frequency converter (3) when the frequency converter (3) operates to be stable;
s5, the output end of the tapping switch (2) is switched to the 4 th input end, the output voltage is 100% U, and when the frequency converter (3) operates stably, the working state of the frequency converter (3) is read;
s6, the output end of the tapping switch (2) is switched to the 5 th input end, the output voltage is 60% U, and the holding time is 5 seconds;
s7, the output end of the tapping switch (2) is switched to the 6 th input end, the output voltage is 100% U, and when the frequency converter (3) operates stably, the working state of the frequency converter (3) is read;
s8, the output end of the tapping switch (2) is switched to the 7 th input end, the output voltage is 20% U, and the tapping switch is kept for 0.5 seconds;
s9, the output end of the tapping switch (2) is switched to the 8 th input end, the output voltage is 100% U, and when the frequency converter (3) operates stably, the working state of the frequency converter (3) is read;
s10, the control recorder 4 judges whether the frequency converter operates normally and records all test parameters and waveforms, and if a certain item fails to be tested in the test process, the next test item is directly entered;
and S11, the control recorder 4 evaluates the low voltage ride through capability of the tested system and generates an analysis report.
While the present invention has been described in detail through the foregoing description of the preferred embodiment, it should be understood that the foregoing description is not to be considered as limiting the invention. Many modifications and substitutions of the present invention will become apparent to those of ordinary skill in the art upon reading the foregoing. Accordingly, the scope of the invention should be limited only by the attached claims.
Claims (9)
1. A voltage ride through test system for rapidly switching operating voltages, for testing the operating performance of a frequency converter (3) in transient overvoltage and low voltage conditions, comprising:
the adjustable transformer (1) is provided with 5 taps at the output end, and 5 voltages with different amplitudes are respectively led out;
the tapping switch (2) comprises 8 input ends and an output end, wherein the tapping switch is controlled by a manual or program controller, one of the 8 input ends is selected to be connected to the output end, and the 8 input ends are connected with 5 taps of the output end of the adjustable transformer (1);
the frequency converter (3) is connected with the tapping switch (2) and the adjustable transformer (1);
the adjustable load (5) is connected with the frequency converter (3) and adjusts the size of the adjustable load (5) according to different output voltages of the frequency converter (3);
the control recorder (4) is respectively connected with the adjustable transformer (1), the tapping switch (2), the frequency converter (3) and the adjustable load (5), the control recorder (4) controls the working states of the adjustable transformer (1), the tapping switch (2) and the frequency converter (3), and collects voltage and current waveforms and switch protection action signals input and output by the frequency converter (3).
2. A voltage ride-through test system according to claim 1, characterized in that the adjustable load (5) comprises several series-connected resistive loads, several series-connected inductive loads and a blower, the several resistive loads and the several inductive loads being provided with several taps, respectively, the choice of taps being varied in dependence on the voltage and frequency of the frequency converter (3), the load being mode-regulated in a constant-flux v/f control; the fan is used for fine adjustment of inductive load to compensate for load adjustment neutral gear; the fan also assists in dissipating heat from the adjustable load (5).
3. A voltage ride-through test system according to claim 1, characterized in that the 5 taps of the adjustable transformer (1) output 20%, 60%, 90%, 100% and 130% U, respectively, where U represents the rated voltage of the frequency converter (3).
4. A voltage ride-through test system according to claim 3, wherein the voltage values at which the 8 inputs of the tap changer (2) are connected in sequence are 130% u, 100% u, 90% u, 100% u, 60% u, 100% u, 20% u and 100% u.
5. A voltage ride-through test system according to claim 1, wherein the control recorder (4) further comprises:
a central controller (41) for controlling the working state of the whole system in a centralized manner;
the input end of the compression storage module (42) is connected with the central controller (41), and the compression storage module exchanges stored data and stores the data in time;
the output end of the data acquisition module (43) is connected with the central controller (41) and the compression storage module (42) to acquire voltage, current and frequency information in the system;
the waveform analysis module (44) records the information acquired by the data acquisition module (43) in real time, draws waveforms, and performs calculation measurement and analysis on the waveforms;
the display module (45) is connected with the central controller (41) and used for displaying waveforms and command keys;
and the printing module (46) is connected with the central controller (41) and outputs a paper report.
6. A voltage ride-through test system according to claim 5, wherein the data acquisition module (43) employs 8 isolated channels, a 16-bit high speed a/D converter.
7. A voltage ride-through test system according to claim 5, wherein the compressed memory module (42) comprises a local memory module and a mobile memory module, the local memory module being connected to the data acquisition module (43) and the mobile memory module, the mobile memory module comprising 2 USB interfaces for connecting to external mobile memory devices.
8. The voltage ride-through test system according to claim 5, wherein the waveform analysis module (44) comprises a waveform recording module and a parameter calculation module, the waveform recording module is connected with the central controller (41) and the parameter calculation module, and the parameter calculation module is connected with the central controller (41).
9. The voltage ride through test method is characterized in that a control recorder (4) controls a tapping switch (2) to sequentially switch different voltages and record data at the same time, and the method comprises the following steps:
s1, the output end of the tapping switch (2) is arranged at the 8 th input end, the output voltage is 100% U, and U represents the rated voltage of the frequency converter (3);
s2, the output end of the tapping switch (2) is switched to the 1 st input end, the output voltage is 130% U, and the holding time is 0.5 seconds;
s3, the output end of the tapping switch (2) is switched to the 2 nd input end, the output voltage is 100% U, and when the frequency converter (3) operates stably, the working state of the frequency converter (3) is read;
s4, switching the output end of the tapping switch (2) to the 3 rd input end, wherein the output voltage is 90% U, the holding time is longer than 5 seconds, and reading the working state of the frequency converter (3) when the frequency converter (3) operates to be stable;
s5, the output end of the tapping switch (2) is switched to the 4 th input end, the output voltage is 100% U, and when the frequency converter (3) operates stably, the working state of the frequency converter (3) is read;
s6, the output end of the tapping switch (2) is switched to the 5 th input end, the output voltage is 60% U, and the holding time is 5 seconds;
s7, the output end of the tapping switch (2) is switched to the 6 th input end, the output voltage is 100% U, and when the frequency converter (3) operates stably, the working state of the frequency converter (3) is read;
s8, the output end of the tapping switch (2) is switched to the 7 th input end, the output voltage is 20% U, and the tapping switch is kept for 0.5 seconds;
s9, the output end of the tapping switch (2) is switched to the 8 th input end, the output voltage is 100% U, and when the frequency converter (3) operates stably, the working state of the frequency converter (3) is read;
s10, the control recorder (4) judges whether the frequency converter operates normally and records all test parameters and waveforms, and if a certain item fails to be tested in the test process, the next test item is directly entered;
and S11, the control recorder (4) evaluates the low voltage ride through capability of the tested system and generates an analysis report.
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