CN110618330A - Current transformer detection platform and detection method - Google Patents
Current transformer detection platform and detection method Download PDFInfo
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- CN110618330A CN110618330A CN201910922551.6A CN201910922551A CN110618330A CN 110618330 A CN110618330 A CN 110618330A CN 201910922551 A CN201910922551 A CN 201910922551A CN 110618330 A CN110618330 A CN 110618330A
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Abstract
The embodiment of the invention relates to the technical field of converters, and discloses a converter detection platform and a detection method. The hardware device of the present invention includes: the device comprises a battery simulation device, a current transformer to be tested, a measuring device, a power grid simulation device, a power grid fault simulation generation device, an anti-islanding RLC device, a plurality of switches and the like. Different system combination modes exist corresponding to different detection items, a user can rapidly switch between different detection items through the automatic detection system, parameters of equipment such as a power grid simulation device, a battery simulation device and an anti-islanding RLC device are adjusted, and therefore detection of different items, such as anti-islanding detection, charge-discharge detection and voltage adaptability detection, is achieved. Meanwhile, a battery simulation device is selected to replace a traditional bidirectional direct-current power supply and a traditional direct-current load, and a converter detection platform is simplified. The detection platform can detect the current transformers with different capacities and voltage grades on the non-alternating current side in the current market, and the detection capacity can reach the megawatt level.
Description
Technical Field
The embodiment of the invention relates to the technical field of current transformers, in particular to a current transformer detection platform and a current transformer detection method.
Background
Along with the development of the energy storage industry, the rapid development of the manufacturing industry of energy storage related equipment is certainly driven, and the energy storage converter is used as an indispensable equipped component for accessing an energy storage system into a power grid, so that more and more enterprises are attracted to enter the market. In order to ensure that the energy storage converter selected in the construction of the energy storage system has complete functions, excellent performance, durability and reliability, higher operation quality and good interconnection interoperability, the function detection of the energy storage converter before network access is very necessary according to a unified standard.
At present, the detection of the energy storage converter in China has a special standard, namely GB/T34133 and 2017 'detection technical regulations of the energy storage converter', and the detection items of the energy storage converter specified by the standard mainly comprise: environment and safety inspection (including medium strength, electric appliance clearance, creepage ratio distance, temperature rise, noise, low temperature environment, high temperature environment, damp and hot environment and shell protection grade); protection function detection (including short circuit protection, polarity reversal protection, direct current over-voltage and under-voltage protection, off-grid over-current protection, over-temperature protection, alternating current incoming line phase sequence protection, communication fault protection and cooling system fault protection); and detecting the grid-connected performance (including charging and discharging, grid connection and disconnection, efficiency, electric energy quality, power control, island prevention, high-low voltage ride through, overload capacity and the like).
However, the inventors found that at least the following problems exist in the prior art: at present, the rated voltage grade of the alternating current side of the energy storage converter on the market is more, and the capacity is also larger and larger, and the rated voltage grade reaches the megawatt level. However, most of the existing energy storage converter detection platforms aim at the detection of energy storage converters of 500kW and below, the detection platforms do not have the detection capability of megawatt energy storage converters, and have the problems of single detection object, limited detection capacity, low integration automation degree and the like, and the detection platforms do not have the integrated high-low voltage crossing detection function. For example, patent 201410395363.X "a photovoltaic system converter test platform", which proposes a photovoltaic converter test platform, which does not integrate a high-low voltage ride through detection function, and cannot meet the detection requirement of product diversity of an energy storage converter; patent 201310503848.1 "a test platform for a large energy storage converter", the detectable energy storage converter has a small power level (maximum 500kW), a small voltage level and a small current level, and cannot meet the detection requirement of a megawatt energy storage converter, and the degree of automation is low; the patent 201310503848.1 'a test platform for large energy storage current transformer' is out of date according to the standard NB/T31016-2011, and the test items cannot meet the requirements of the latest specifications.
Disclosure of Invention
The invention aims to provide a converter detection platform and a detection method, so that the detection of a megawatt converter can be realized through the detection platform, and various detections can be realized.
In order to solve the above technical problem, an embodiment of the present invention provides a converter detection platform, including: the device comprises a battery simulation device, a current transformer to be tested, a measurement device, a power grid simulation device, a power grid fault simulation generation device, an anti-islanding RLC device, a plurality of switches, a first isolation transformer, a second isolation transformer and a power supply device; the input end of the battery simulation device is connected with the direct current end of the converter to be tested through a first switch; the alternating current end of the converter to be tested is connected with the output end of the power grid simulation device or the output end of the power grid fault simulation generation device through a second switch, wherein the second switch is a selection switch; the input end of the power grid fault simulation device is connected with the power supply device through the second isolation transformer; two ends of the measuring device are respectively connected with the direct current end and the alternating current end of the converter to be measured, and alternating current and direct current performance parameter data of the converter to be measured are collected; two ends of the power grid simulation device form a loop through a third switch, wherein the third switch controls the operation of the power grid simulation device; the anti-islanding RLC device is connected to the detection platform through a fourth switch, wherein an access point of the anti-islanding RLC device is located between the second switch and the power grid simulation device.
The embodiment of the invention also provides a detection method of the current transformer detection platform, which is applied to the current transformer detection platform and comprises the following steps: setting the operating power of the power grid simulation device to be the rated charging power PCIs provided withThe charging time of the converter to be tested is TCWherein the rated charging power PCThe rated power of the AC end of the converter to be tested is obtained; setting the output power of the battery simulation device to be rated discharge power PfSetting the discharge time of the converter to be tested to be Tf(ii) a Setting the operation mode of the converter to be tested as a charging mode; the second switch is connected with the power grid simulation device, and the third switch is disconnected; if the charging time reaches TCSetting the operation mode of the converter to be tested as a discharging mode; measuring and recording the waveform change of the DC end of the converter to be measured, and calculating the time interval t from 90 percent of rated charging power to 90 percent of rated discharging powera(ii) a If the charging time reaches TfSetting the operation mode of the converter to be tested as a charging mode; measuring and recording the waveform change of the DC end of the converter to be measured, and calculating the time interval t from 90 percent of rated discharge power to 90 percent of rated charge powerb(ii) a Calculating the charge-discharge switching time t ═ t (t)a+tb) And/2, finishing the test and outputting a test report.
The embodiment of the invention also provides a detection method of the current transformer detection platform, which is applied to the current transformer detection platform and comprises the following steps: setting the working mode of the converter to be tested as a grid-connected working mode; the second switch is connected with the power grid simulation device, and the third switch is disconnected; adjusting the output voltage of the power grid simulation device to be three values of 86% -109% Un, wherein Un is the rated voltage of an access system; measuring and recording the frequency, the state and the action condition of the output end of the converter to be tested; adjusting the output voltage of the power grid simulation device to be three values of 111% -119% Un; measuring and recording the frequency, the state and the action condition of the output end of the converter to be tested; adjusting the output voltage of the power grid simulation device to 121% Un; measuring and recording the frequency, the state and the action condition of the output end of the converter to be tested; disconnecting the second switch, and setting the working mode of the converter to be tested as a grid-connected discharging mode; and closing the second switch, and if the state of the detection platform is correct, ending the test and outputting a detection report.
Compared with the prior art, the embodiment of the invention has the advantages that two ends of the measuring device are respectively connected with the direct current end and the alternating current end of the converter, and the alternating current and direct current performance parameter data of the converter are collected; through the combination control of different switches and devices, the performance parameters of the current transformer collected by the measuring device can change, and a user can adjust the parameters of the battery simulation device and the anti-islanding RLC device and other devices according to different detection requirements, so that the detection of different items by the detection platform is realized, for example, anti-islanding detection, charge-discharge detection, voltage adaptability detection and the like. Meanwhile, a battery simulator is selected to replace a traditional bidirectional direct-current power supply and a traditional direct-current load, a converter detection platform is simplified, the converter detection platform can detect the converters with different capacities and voltage grades at the non-alternating-current side in the current market, the types and the capacities of the converters can be changed according to actual detection requirements, the detection of the megawatt converter can be realized to the maximum extent, and the detection requirement of the diversity of the converter products is met.
In addition, the converter detection platform further comprises a first multi-tap transformer and a second multi-tap transformer; the first multi-tap transformer is positioned between the second switch and the grid simulating device; the second multi-tap transformer is located between the second switch and the grid fault simulation generation device. The secondary side of the multi-tap transformer has multiple voltage levels, so that the detection platform can be matched with the current transformer with different voltage levels for detection, and the detection capacity range and flexibility are increased.
In addition, the power grid fault simulation generation device comprises a low-voltage fault generation device and a high-voltage fault generation device, wherein the low-voltage fault generation device simulates a low-voltage ride-through detection environment, and the high-voltage fault generation device simulates a high-voltage ride-through detection environment. The power grid fault simulation device comprises a low-voltage fault generation device and a high-voltage fault generation device, and the low-voltage ride through detection environment and the high-voltage ride through environment are simulated respectively, so that high-voltage and low-voltage ride through combined test can be realized.
In addition, the converter detection platform also comprises a centralized control center; the centralized control center is connected with the second switch, the third switch, the fourth switch, the battery simulation device, the current transformer, the measuring device, the power grid simulation device, the power grid fault simulation generating device and the anti-islanding RLC device, and remote control of the centralized control center is achieved. The centralized control center realizes different detections for a plurality of switches and a plurality of devices through remote control, thereby leading the automation degree of the detection platform to be higher.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
FIG. 1 is a schematic structural diagram of a current transformer detection platform according to a first embodiment of the invention;
FIG. 2 is a schematic structural diagram of a current transformer detection platform according to a second embodiment of the invention;
FIG. 3 is a schematic flow chart of a detection method of a current transformer detection platform according to a third embodiment of the invention;
FIG. 4 is a schematic flow chart of a detection method of a current transformer detection platform according to a fourth embodiment of the invention;
fig. 5 is a schematic flow chart of a detection method of a current transformer detection platform according to a fifth embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not constitute any limitation to the specific implementation of the present invention, and the embodiments may be mutually incorporated and referred to without contradiction.
A first embodiment of the present invention relates to a current transformer detection platform, as shown in fig. 1, specifically including: the device comprises a battery simulation device 101, a converter to be tested 102, a measuring device 103, a power grid simulation device 104, a power grid fault simulation generation device 105, a power supply device 106, an anti-islanding RLC device 107, a first isolation transformer 108, a second isolation transformer 109, a first switch S1, a second switch S2, a third switch S3 and a fourth switch S4; the input end of the battery simulation device 101 is connected with the direct current end of the converter to be tested 102 through a first switch S1; the alternating current end of the converter to be tested 102 is connected with the output end of the power grid simulation device 104 or the output end of the power grid fault simulation generation device 105 through a second switch S2, wherein the second switch S2 is a selection switch; two ends of the measuring device 103 are respectively connected with the direct current end and the alternating current end of the converter 102, and alternating current and direct current performance parameter data of the converter 102 to be measured are collected; the two ends of the grid simulator 104 form a loop through a third switch S3, wherein the third switch S3 controls the operation of the grid simulator 104; the input end of the power grid simulation device is connected with the power supply device 106 through a first isolation transformer 108, and the input end of the power grid fault simulation device is connected with the power supply device 106 through a second isolation transformer 109; the anti-islanding RLC device 107 is connected to the detection platform through the fourth switch S4, wherein an access point of the anti-islanding RLC device 107 is located between the second switch S2 and the grid simulation device 104. The input terminal of the battery simulator 101 is connected to the dc terminal of the converter 102 via the first switch S1.
Specifically, the battery simulator 101 has high precision and high dynamic response characteristics, adopts full digital control, has high control precision, high response speed, wide output regulation range, and has the function of feeding back energy to the power grid. The output has the characteristics of simulating the characteristics of various batteries, setting different serial and parallel connection node numbers and charging and discharging of the batteries under different battery electric quantities. The output of the battery emulator 101 has a programmable function and can be used in a variety of situations by different control software. The battery output characteristic and the battery charging and discharging can be simulated. The power supply can enable a user to select the type, the serial section number, the parallel section number and the battery electric quantity index of the simulation battery, thereby comprehensively simulating the output characteristic of the battery, including the process of battery internal resistance characteristic change in the battery discharging process. In addition, the battery simulation apparatus 101 uses a multithreading technique, a database technique, a fast data storage module design, a customizable report, and a multi-format report output. Specifically, the input end of the battery simulator 101 is connected to the dc terminal of the converter under test 102 through the first switch S1.
In this embodiment, the converter to be detected 102 includes one of an energy storage converter, a photovoltaic grid-connected inverter, and a light storage complementary ac, the type and capacity of the converter can be changed according to the actual detection requirement, the detection of the megawatt converter can be realized to the maximum extent, and the detection requirement of the product diversity of the converter can be met. Specifically, the dc end of the converter to be tested 102 is connected to the battery simulator 101 through the first switch S1, the ac end of the converter to be tested 102 is connected to the second switch S2, and the converter to be tested 102 can convert ac power to dc power.
In this embodiment, the second switch S2 is a selection switch, and may be connected to the power grid simulation apparatus 104 or the power grid fault simulation generation apparatus 105, respectively, and may be connected to different apparatuses according to different detection requirements of the detection platform, so as to implement different detections.
Specifically, the grid simulator 104 provides various disturbances to the testing platform, including voltage fluctuation, voltage sag/drop, harmonic disturbance, three-phase imbalance, etc., and simulates various conditions that may occur in the grid. Each phase voltage value can be independently regulated and programmed, the frequency value can be regulated and programmed, and electric energy can flow in two directions.
In this embodiment, two ends of the power grid simulation device 104 form a loop through the third switch S3, where the third switch S3 controls the operation of the power grid simulation device 104, when the third switch S3 is closed, the power grid simulation device 104 is short-circuited and is in a state of stopping working, and when the third switch S3 is open, the power grid simulation device 104 is in a state of working, so that the third switch S3 controls the operation of the power grid simulation device 104, and the converter to be tested can be directly connected to the power grid for related detection.
Specifically, the grid fault simulation device 105 includes a low voltage fault occurrence device and a high voltage fault occurrence device. The low-voltage ride through detection environment and the high-voltage ride through environment are simulated respectively, and high-voltage and low-voltage ride through combined test can be realized. The low-voltage fault generation device uses the passive reactor to simulate the voltage drop of a power grid, and can simulate three-phase symmetrical voltage drop, phase-to-phase voltage drop and single-phase voltage drop. The high-voltage fault generating device adopts a passive device and consists of a current-limiting reactor, a boosting capacitor, a damping resistor and a circuit breaker. Three-phase symmetrical voltage rise can be simulated.
In this embodiment, the input terminal of the grid simulator 104 is connected to the power supply device 106 through the first isolation transformer 108, and the input terminal of the grid fault simulator is connected to the power supply device 106 through the first isolation transformer 108. That is to say, the first isolation transformer 108 and the second isolation transformer 109 are connected to the power supply device 106 together, wherein the voltage of the power supply device 106 is 10kV, the voltages at both ends of the second isolation transformer 109 are the same and are both 10kV, the voltage at the side of the first isolation transformer 108 connected to the power supply device is 10kV, and the voltage at the end connected to the grid simulation device 104 is 380V.
Specifically, two ends of the measuring device 103 are connected to the dc end and the ac end of the converter 102, respectively, and collect ac/dc performance parameter data of the converter 102. The measuring device 103 comprises a voltage transformer, a current transformer, a power analyzer, an electric energy quality analyzer, an oscilloscope and the like, collects performance parameter data of a direct current end and an alternating current end of the converter 102 for test project data, and finally performs systematic data analysis and unified processing, and simultaneously provides a test report according to a preset format.
Specifically, the anti-islanding RLC device 107 accesses the detection platform through the fourth switch S4, wherein an access point of the anti-islanding RLC device 107 is located between the second switch S2 and the grid simulation device 104. The anti-islanding RLC device 107 is composed of a resistive load, an inductive load and a capacitive load, and is provided with an electrical parameter detection system. The three-phase load power is independently controlled, the power input is controlled in a sectional type combination mode, various power loads can be simulated in any combination mode, the full-automatic loading measurement capability is achieved, and the detection requirement of an anti-islanding effect test is met.
In this embodiment, by controlling the starting of different switches and devices, the performance parameters of the converter 102 collected by the measuring device 103 may change, and a user may adjust the battery simulator 101, the converter 102 and other devices according to different detection requirements, thereby realizing the detection of different items by the detection platform, such as anti-islanding detection, charge-discharge detection, voltage adaptability detection and the like. Meanwhile, a battery simulator is selected to replace a traditional bidirectional direct-current power supply and a traditional direct-current load, a converter detection platform is simplified, the type and the capacity of the converter 102 can be changed according to actual detection requirements, the detection capacity can reach megawatt level, and the detection requirement of the product diversity of the converter is met. The details of the current transformer detection platform of the present embodiment are specifically described below, and the following description is only provided for the sake of understanding, and is not necessary to implement the present embodiment.
A second embodiment of the invention relates to a current transformer testing platform. The second embodiment is substantially the same as the first embodiment, and mainly differs therefrom in that: in the second embodiment, the converter detection platform further includes a first multi-tap transformer 210, a second multi-tap transformer 211, and a centralized control center 212.
As shown in fig. 2, the current transformer detection platform in this embodiment specifically includes: the system comprises a battery simulation device 201, a converter 202, a measuring device 203, a grid simulation device 204, a grid fault simulation generation device 205, a power supply device 206, an anti-islanding RLC device 207, a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, a first multi-tap transformer 210, a second multi-tap transformer 211, a first isolation transformer 208, a second isolation transformer 209 and a centralized control center 212.
Since the first embodiment corresponds to the present embodiment, the present embodiment can be implemented in cooperation with the first embodiment. The related technical details mentioned in the first embodiment are still valid in this embodiment, and the technical effects that can be achieved in the first embodiment can also be achieved in this embodiment, and are not described herein again in order to reduce the repetition.
In the present embodiment, the first multi-tap transformer 210 and the second multi-tap transformer 211 are included, the first multi-tap transformer 210 is located between the second switch S2 and the grid simulation device, and the second multi-tap transformer 211 is located between the second switch S2 and the grid fault simulation generation device. The secondary sides of the first multi-tap transformer 210 and the second multi-tap transformer 211 have multiple voltage levels, so that the detection platform can be matched with the detection of converters with different voltage levels, and megawatt detection can be realized to the maximum extent.
In this embodiment, the system further comprises a centralized control center, the centralized control center is connected with the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, the battery simulation device 201, the converter to be tested 202, the measurement device 203, the grid simulation device 204, the grid fault simulation generation device 205, and the anti-islanding RLC device 207, and the centralized control center 212 realizes remote control of the detection platform.
Specifically, the centralized control center 212 can connect the battery simulation device 201, the grid simulation device 204, the grid fault simulation generation device 205, and the anti-islanding RLC device 207 to the same system through the remote control switches S1-S4, perform the unified on-off operation of the switches of the test system, control the on-off operation of different switches according to different detection items, and enable a user to quickly perform the switching operation between different detection items.
The centralized control center 212 performs remote control operation on the battery simulation device 201 and the converter 202 to be tested through remote control software, the test process can be automatically tested according to a pre-programmed program, meanwhile, a data acquisition system integrated by a detection platform perhaps generates corresponding test data, and simultaneously, a test report is automatically generated according to a format defined by a user.
In this embodiment, the centralized control center 212 pre-stores a software system, is in a modular format, has high expandability, and can expand and add measurement and control functions of different test items according to factory inspection needs. The detection platform provides an intelligent detection operation platform which is used for controlling and displaying all circuit breakers and contactors in the switch and can control the starting stop, emergency stop and control parameter setting of a direct-current power supply, an alternating-current power supply, island equipment and a direct-current load in a test system.
In this embodiment, the sequence of the automatic detection process of the detection platform sequentially includes: software initialization, user request input of test items, equipment sending work sequence designation, equipment output test according to designated sequence, data storage, data analysis and processing, and test report generation.
Specifically, a user requests to input a test item for selecting the test item by the user, wherein the test item comprises anti-islanding detection, charge and discharge detection, voltage adaptability detection, low voltage ride through detection, high voltage ride through detection and the like; the appointed equipment sends a work sequence which is used for sending the work sequence to the detection platform as the software system has the equipment participating in the test and the sequence participating in the test in the current detection after determining a specific detection project; then, the equipment outputs a test according to a specified sequence to realize the detection; the data analysis processing is used for carrying out relevant calculation analysis according to the data uploaded by the data acquisition device, displaying and storing the original data into a database in the forms of charts and the like; and finally, generating a test report, automatically generating a word document form report according to the corresponding data analysis result and the obtained chart, and judging whether the corresponding test is qualified or not according to the corresponding evaluation standard.
The detection platform of the embodiment can also realize the omnibearing real state simulation of the operating state of the Battery Management System (BMS). The method provides accurate scientific basis for the evaluation of the safety and reliability of the BMS system, and can be applied to the fields of BMS type tests, factory tests, performance detection, research and development of the BMS management system and the like.
This embodiment is through centralized control center, and the connection between the different equipment of control is closed and the disconnection to the switch of control difference for the user can swiftly carry out the switching between the different detection projects according to the demand, thereby reaches the higher effect of degree of automation.
A third embodiment of the present invention relates to a detection method for a converter detection platform, and as shown in fig. 3, the detection method of the present embodiment specifically realizes anti-islanding detection, and includes the following steps:
step 301, setting the working mode of the converter to be a grid-connected mode and island protection time.
And step 302, setting a second switch to be connected with the power grid simulation device, and closing the first switch and the third switch.
Specifically, after the converter and the battery simulator are put into use, whether the running state of the current detection platform is correct or not is judged, if the running state of the current detection platform is normal, the step 303 is performed, if the running state of the current detection platform is abnormal, the second switch and the third switch are disconnected, the state of the current detection platform is checked and repaired, and the step 301 is performed again after the repair.
Step 303, adjusting the battery simulation device to make the output power of the converter be the rated ac output power.
And 304, setting the fourth switch to be in a closed state, so that the anti-islanding RLC device is in a working state.
305, adjusting quality factor Q of anti-islanding RLC devicef。
Specifically, the quality factor Qf＝1.0，QfThe error of (2) is not more than 0.05.
Step 306, adjusting the current of the alternating current end of the converter;
specifically, the current at the alternating current end of the regulating converter is less than 1% of the output current in a steady state.
Step 307, the second switch is opened, and the island operation time t is measured and recorded1。
In particular, the island run time t1To turn off the second switch until the output current drops to 1% of the rated current.
And 308, connecting the second switch to the power grid simulation device again, and adjusting the converter to be in a grid-connected mode.
Step 309, adjusting the anti-islanding RLC device to enable the active power and the reactive power output by the converter to meet the requirement of standard deviation, wherein the standard deviation is ± 5.
Step 310, the second switch is disconnected, and the island operation time t is measured and recorded2。
Step 311, t2Whether or not it is greater than t1If t is2Greater than t1Go to step 312; if t2Less than t1Then return to step 309.
Specifically, if t2Less than t1Then, returning to step 309, the active power and the reactive power output by the converter are continuously adjusted by a deviation of 1% according to the standard requirement.
Step 312, outputting a test report.
A fourth embodiment of the present invention relates to a detection method for a current transformer detection platform, and as shown in fig. 4, the detection method of the present embodiment specifically implements charge and discharge detection, and as shown in fig. 4, includes the following steps:
step 401, setting the operation power of the power grid simulation device to be the rated charging power PCSetting charging time of converter to TCWherein the rated charging power PCThe rated power of the AC end of the converter.
Step 402, setting the output power of the battery simulator to the rated discharge power PfSetting the discharge time of the converter to Tf。
And step 403, setting the operation mode of the converter to be a charging mode.
And step 404, setting a second switch to be connected with the power grid simulation device, closing the first switch and opening the third switch.
Specifically, after the power grid simulation device, the battery simulation device and the converter are put into use, whether the current operation state of the detection platform is normal or not is judged, if the current operation state of the detection platform is normal, the step 405 is performed, and if the current operation state of the network is abnormal, the second switch is turned off, and the step 401 is performed again.
Step 405, when the charging time reaches TCAt this time, the operation mode of the inverter is set to the discharging mode, and in this embodiment,charging time TCIs 3 min.
Specifically, after the operation mode of the converter is set to be the discharging mode, whether the operation state of the detection platform is normal or not is judged, if the operation state of the detection platform is normal, step 406 is performed, and if the operation state of the detection platform is abnormal, the second switch is turned off, and step 401 is performed again.
Step 406, measuring and recording the waveform change of the DC end of the converter, and calculating the time interval t from 90% of rated charging power to 90% of rated discharging powera。
Step 407, when the charging time reaches TfIn the present embodiment, the operation mode of the converter is set as the charging mode, and the charging time T is set as the charging time TfIs 3 min.
Specifically, after the operation mode of the converter is set to be the charging mode, whether the state of the current detection platform is normal is determined, if the state of the current detection platform is normal, step 408 is performed, and if the state of the current detection platform is abnormal, the second switch is turned off, and step 407 is performed again.
Step 408, measuring and recording the waveform change of the direct current end of the converter, and calculating the time interval t from 90% of rated discharge power to 90% of rated charge powerb。
In step 409, charge/discharge switching time t ═ is calculated (t)a+tb)/2。
Step 410, outputting a test report.
The fifth embodiment of the present invention relates to a detection method for a current transformer detection platform, which specifically implements voltage adaptability detection, and as shown in fig. 5, includes the following steps:
step 501, setting the working mode of the converter to be a grid-connected working mode.
Step 502, a second switch is set to be connected with the power grid simulation device, the first switch is closed, and the third switch is opened.
Specifically, after the converter, the battery simulator and the grid simulator are put into use, whether the current detection platform is normal or not is judged, if the current detection platform is normal, the step 503 is performed, if the current detection platform is abnormal, the second switch is turned off, the current detection platform is checked and repaired, and after the current detection platform is repaired, the step 501 is performed again.
Step 503, adjusting the output voltage of the power grid simulation device to be three values of 86% -109% Un.
Specifically, Un is the rated voltage of the access system, and the output voltage of the grid simulator is set to 86% Un, the intermediate value and 109% Un.
And step 504, measuring and recording the frequency, the state and the action condition of the output end of the converter.
Specifically, after step 503, the detection platform operates for 4s, and then starts to measure and record the frequency, state, and operation condition of the output end of the converter, and if the converter operates, the converter needs to be reset, and then step 505 is performed.
And 505, adjusting the output voltage of the power grid simulation device to be three values of 111% -119% Un.
Specifically, the output voltage of the grid simulator is set to 111% Un, the intermediate value, 119% Un.
And step 506, measuring and recording the frequency, the state and the action condition of the output end of the converter.
Specifically, after step 505, after the detection platform is operated for 4s, the frequency, state and operation of the output end of the converter are measured and recorded, and if the converter is operated, the converter needs to be reset, and then step 507 is performed.
And step 507, adjusting the output voltage of the power grid simulation device to 121% Un.
And step 508, measuring and recording the frequency, the state and the action condition of the output end of the converter.
Specifically, after the detection platform runs for 4s after step 507, the frequency, the state and the action condition of the output end of the converter are measured and recorded.
And 509, disconnecting the second switch and setting the working mode of the converter to be a grid-connected discharging mode.
Step 510, close the second switch.
Step 511, judging whether the current detection platform state is normal, if the detection platform state is normal, entering step 512, if the detection platform state is abnormal, disconnecting the second switch, checking the detection platform state and repairing, and after repairing, entering step 509 again.
And step 512, outputting a test report.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific embodiments for practicing the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (8)
1. A current transformer test platform, comprising: the device comprises a battery simulation device, a current transformer to be tested, a measurement device, a power grid simulation device, a power grid fault simulation generation device, an anti-islanding RLC device, a plurality of switches, a first isolation transformer, a second isolation transformer and a power supply device;
the input end of the battery simulation device is connected with the direct current end of the converter to be tested through a first switch;
the alternating current end of the converter to be tested is connected with the output end of the power grid simulation device or the output end of the power grid fault simulation generation device through a second switch, wherein the second switch is a selection switch;
the input end of the power grid fault simulation device is connected with the power supply device through the second isolation transformer;
two ends of the measuring device are respectively connected with the direct current end and the alternating current end of the converter to be measured, and alternating current and direct current performance parameter data of the converter to be measured are collected;
two ends of the power grid simulation device form a loop through a third switch, wherein the third switch controls the operation of the power grid simulation device;
the anti-islanding RLC device is connected to the detection platform through a fourth switch, wherein an access point of the anti-islanding RLC device is located between the second switch and the power grid simulation device.
2. The converter testing platform of claim 1, further comprising a first multi-tap transformer, a second multi-tap transformer;
the first multi-tap transformer is positioned between the second switch and the grid simulating device;
the second multi-tap transformer is located between the second switch and the grid fault simulation generation device.
3. The converter testing platform according to claim 1 or 2, wherein the grid fault simulation generation device comprises a low voltage fault generation device and a high voltage fault generation device, wherein the low voltage fault generation device simulates a low voltage ride through testing environment, and the high voltage fault generation device simulates a high voltage ride through testing environment.
4. The converter testing platform of claim 1, wherein the converter under test comprises one of an energy storage converter, a photovoltaic grid-connected inverter, and a complementary ac photovoltaic storage converter.
5. The converter testing platform of claim 1, further comprising a centralized control center;
the centralized control center is connected with the second switch, the third switch, the fourth switch, the battery simulation device, the converter to be tested, the measuring device, the power grid simulation device, the power grid fault simulation generating device and the anti-islanding RLC device, and remote control of the centralized control center is achieved.
6. The detection method of the current transformer detection platform is applied to the current transformer detection platform of any one of claims 1 to 5, and is characterized by comprising the following steps:
setting the working mode of the converter to be tested as a grid-connected mode and island protection time;
the second switch is connected with the power grid simulation device, and the first switch and the third switch are closed;
adjusting the battery simulation device to enable the output power of the converter to be tested to be rated alternating current output power;
setting the fourth switch to be in a closed state, and enabling the anti-islanding RLC device to be in a working state;
adjusting quality factor Q of the anti-islanding RLC devicef；
Adjusting the current of the alternating current end of the converter to be tested;
disconnecting the second switch, measuring and recording the island operation time t1；
Connecting the second switch with the power grid simulation device again, and adjusting the converter to be tested to be in a grid-connected mode;
adjusting the anti-islanding RLC device to enable active power and reactive power output by the converter to be tested to meet the requirement of standard deviation, wherein the standard deviation is +/-5;
disconnecting the second switch, measuring and recording the island operation time t2；
If t2Greater than t1If yes, outputting a test report;
if t2Less than t1Continuously adjusting the anti-islanding RLC device, and continuously adjusting the deviation of the active power and the reactive power output by the converter to be tested by 1% according to the standard requirement until t2Greater than t1。
7. The detection method of the current transformer detection platform is applied to the current transformer detection platform of any one of claims 1 to 5, and is characterized by comprising the following steps:
setting the operating power of the power grid simulation device to be the rated charging power PCSetting the charging time of the converter to be tested to be TCWherein the rated charging power PCThe rated power of the AC end of the converter to be tested is obtained;
setting the output power of the battery simulation apparatus to a rated valueDischarge power PfSetting the discharge time of the converter to be tested to be Tf；
Setting the operation mode of the converter to be tested as a charging mode;
the second switch is connected with the power grid simulation device, the first switch is closed, and the third switch is opened;
if the charging time reaches TCSetting the operation mode of the converter to be tested as a discharging mode;
measuring and recording the waveform change of the DC end of the converter to be measured, and calculating the time interval t from 90 percent of rated charging power to 90 percent of rated discharging powera；
If the charging time reaches TfSetting the operation mode of the converter to be tested as a charging mode;
measuring and recording the waveform change of the DC end of the converter to be measured, and calculating the time interval t from 90 percent of rated discharge power to 90 percent of rated charge powerb；
Calculating the charge-discharge switching time t ═ t (t)a+tb) And/2, finishing the test and outputting a test report.
8. The detection method of the current transformer detection platform is applied to the current transformer detection platform of any one of claims 1 to 5, and is characterized by comprising the following steps:
setting the working mode of the converter to be tested as a grid-connected working mode;
the second switch is connected with the power grid simulation device, the first switch is closed, and the third switch is opened;
adjusting the output voltage of the power grid simulation device to be three values of 86% -109% Un, wherein Un is the rated voltage of an access system;
measuring and recording the frequency, the state and the action condition of the output end of the converter to be tested;
adjusting the output voltage of the power grid simulation device to be three values of 111% -119% Un;
measuring and recording the frequency, the state and the action condition of the output end of the converter to be tested;
adjusting the output voltage of the power grid simulation device to 121% Un;
measuring and recording the frequency, the state and the action condition of the output end of the converter to be tested;
disconnecting the second switch, and setting the working mode of the converter to be tested as a grid-connected discharging mode;
and closing the second switch, and if the state of the detection platform is correct, ending the test and outputting a detection report.
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