CN116184082A - Opposite-dragging test platform and test method for AC/DC micro-grid converter - Google Patents
Opposite-dragging test platform and test method for AC/DC micro-grid converter Download PDFInfo
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Abstract
The invention discloses a pair-pulling test platform of an AC/DC micro-grid converter and a test method thereof, wherein the pair-pulling test platform comprises a power supply part and a pair-pulling part, the power supply part provides AC power and DC power for the pair-pulling part, the pair-pulling part comprises two DC micro-grid converters which are isolated by an isolation transformer and have a common AC port and a common DC port, one is tested equipment and runs under full power under various functions, the other is auxiliary test equipment, and a path for providing power flow for the tested equipment; and (3) according to the flow of the testing method, full-power testing of the direct-current voltage stabilizing function, the alternating-current voltage stabilizing function, the power control function and the electric energy quality management function is sequentially completed.
Description
Technical Field
The invention relates to the technical field of power electronics and control thereof, in particular to a butt-dragging test platform of an AC/DC micro-grid converter and a test method thereof.
Background
Micro-grids are one of the important directions of future grid technology development. With the continuous development of renewable energy technology and power electronic technology, more and more distributed power supplies, energy storage and loads (such as charging piles of new energy automobiles) based on the power electronic technology are collocated together to form a micro-grid. The grid form of the micro-grid is convenient for realizing the centralized management of loads and distributed power supplies, such as devices with direct current characteristics of photovoltaic power generation, energy storage batteries, direct current charging piles and the like can form a direct current micro-grid, and alternating current distributed power supplies of wind power generation and the like and alternating current power grids in the area can form an alternating current micro-grid. The AC/DC micro-grid converter is key equipment for connecting an AC micro-grid with a DC micro-grid, and has more diversified functions along with the development of technology, and is commonly provided with a DC voltage stabilizing function as a main power supply of the DC micro-grid to supply power to the DC micro-grid or consume surplus electric energy in the DC micro-grid; an alternating current voltage stabilizing function is used as an auxiliary power supply of the alternating current micro-grid, and the alternating current micro-grid is powered under the conditions that the alternating current large power grid is abnormally powered off and the electric energy of the direct current micro-grid is surplus; the power control function realizes power scheduling between the AC/DC micro-grid, and at the moment, the AC/DC micro-grid has respective power supply, and the AC/DC micro-grid converter mainly plays a role in power coordination; and the power quality control function realizes reactive compensation, unbalance compensation and harmonic control of the AC micro-grid by utilizing the residual capacity of the AC/DC micro-grid converter.
The AC/DC micro-grid converter is a key device and an intermediate link of the AC/DC micro-grid, and the reliability of the AC/DC micro-grid converter is an important guarantee for the safe operation of the AC/DC micro-grid. In order to fully verify the performance of the AC/DC micro-grid converter, the full power test is necessary during the factory test, and the reliability of the design of the power device, the heat dissipation system, the through-flow component and the like is fully checked. Currently, there are two general methods for full power testing, direct testing and opposite drag testing. The direct test method has high requirements on the power supply and equipment capacity of a laboratory, and is difficult to realize under the environmental condition of the laboratory along with the continuous improvement of the capacity of the converter; the drag test method has low requirement on power capacity and low cost, and is an important means for full power test. However, with the shortage of traditional fossil energy, development of new energy industry and encouragement and support of national policy, the installed capacity of direct current equipment such as photovoltaic power generation, energy storage and direct current charging piles can be rapidly developed, various types of alternating current/direct current micro-grid converters can be continuously evolved and rapidly developed along with the rapid development, the functions of the converters are more and more, and the power of the converters is also more and more; in the actual product development and testing process, the academic papers and the existing trawling test schemes in the patent are found to be incapable of meeting the requirements of full power testing of various functions.
Disclosure of Invention
The invention provides a pair-dragging test platform of an AC/DC micro-grid converter and a test method thereof, aiming at the defects and the shortcomings existing in the prior art, wherein the pair-dragging test platform comprises a power supply part and a pair-dragging part, and the power supply part provides an AC power supply and a DC power supply for the pair-dragging part; the opposite-dragging part comprises two direct current micro-grid converters of a common alternating current port and a common direct current port which are isolated by an isolation transformer, wherein one converter is tested equipment and runs at full power under various functions, the other converter is auxiliary test equipment, and a path for providing power flow for the tested equipment; the test method takes an AC/DC micro-grid converter as the tested equipment to sequentially complete full-power test of a DC voltage stabilizing function, an AC voltage stabilizing function, a power control function and an electric energy quality control function.
The aim of the invention can be achieved by the following technical scheme:
a pair-dragging test platform of an AC/DC micro-grid converter comprises a power supply part and a pair-dragging part:
the power supply section includes: the system comprises a 380V power grid, a first alternating current switch, a third alternating current/direct current micro-grid converter and a sixth direct current switch, wherein the 380V power grid provides an alternating current power supply for a 380V alternating current bus of the opposite dragging part through the first alternating current switch, the 380V power grid is connected with an alternating current port of the third alternating current/direct current micro-grid converter, and the third direct current micro-grid converter generates 750V voltage and provides a direct current power supply for a 750V direct current bus of the opposite dragging part through the sixth direct current switch;
the butt-towing part comprises: the system comprises a 380V alternating current bus, a 750V direct current bus, a first alternating current-direct current micro-grid converter, a second alternating current-direct current micro-grid converter, an isolation transformer, a second alternating current switch, a third alternating current switch, a fourth alternating current switch and a fifth alternating current switch, wherein the 380V alternating current bus is connected with an alternating current port of the first alternating current-direct current micro-grid converter through the second alternating current switch, the 380V alternating current bus is connected with an alternating current port of the second alternating current-direct current micro-grid converter through the third alternating current switch and the isolation transformer in sequence, the 750V direct current bus is connected with a direct current port of the first alternating current-direct current micro-grid converter through the fourth direct current switch, the 750V direct current bus is connected with a direct current port of the second alternating current-direct current micro-grid converter through the fifth direct current switch, and the first alternating current-direct current-current micro-grid converter is used for sampling the 380V alternating current bus three-phase power grid current through three alternating current sampling lines, so that the power grid voltage can be obtained before the second alternating current switch is not turned on, and normal starting of equipment is ensured.
Further, the AC/DC micro-grid converter is of a three-phase three-level DC/AC topology, the main circuit comprises a DC port, a DC bus capacitor, a three-phase three-level inverter bridge, an LCL filter, an AC port and a control system, and the first AC/DC micro-grid converter, the second AC/DC micro-grid converter and the third AC/DC micro-grid converter have consistent topologies and control systems.
Further, the ac/dc microgrid converter has three working modes: the system comprises a direct current voltage stabilizing mode, an alternating current voltage stabilizing mode and a power control mode, wherein the direct current voltage stabilizing mode is used for direct current voltage stabilization and electric energy quality management, the alternating current voltage stabilizing mode is used for alternating current voltage stabilization, the power control mode is used for power control between alternating current and direct current, and the first alternating current-direct current micro-grid converter, the second alternating current-direct current micro-grid converter and the third alternating current-direct current micro-grid converter all have three working modes, wherein the second alternating current-direct current micro-grid converter has a harmonic source function and can output reactive power, unbalance and harmonic current.
Further, the isolation transformer realizes an isolation function, breaks the circulation of the towed part and suppresses electromagnetic interference.
Further, the first ac switch, the second ac switch, the third ac switch, the fourth dc switch, the fifth dc switch, and the sixth dc switch can be connected in different topologies to realize full power testing with different functions, and all have overcurrent protection functions.
A test method for a butt-towing test platform of an AC/DC micro-grid converter specifically comprises the following steps:
step 1: constructing a trawling test platform, and confirming that all devices are turned off and all switches are turned off, and accessing a first AC/DC micro-grid converter, a second AC/DC micro-grid converter and a third AC/DC micro-grid converter of the device to be tested as auxiliary test devices, wherein the auxiliary test devices are devices which pass the test;
step 2: performing a direct current voltage stabilizing function test, closing a first alternating current switch, a second alternating current switch, a third alternating current switch, a fourth direct current switch and a fifth direct current switch, keeping the sixth direct current switch to be disconnected, setting a first alternating current-direct current micro-grid converter to be in a direct current voltage stabilizing mode and starting up to operate, setting a second alternating current-direct current micro-grid converter to be in a power control mode and starting up to operate, performing subsequent tests according to a formulated test routine, recording operation data of tested equipment in real time by an upper computer during the test, completing shutdown of all equipment after the test, disconnecting all switches, continuing the subsequent tests if the test passes, replacing the tested equipment if the test does not pass, and restarting the test;
step 3: performing alternating current voltage stabilizing function test, closing a second alternating current switch, a third alternating current switch, a fourth direct current switch, a fifth direct current switch and a sixth direct current switch, keeping the first alternating current switch open, setting a third alternating current-direct current micro-grid converter to be in a direct current voltage stabilizing mode and start-up operation, setting the first alternating current-direct current micro-grid converter to be in an alternating current voltage stabilizing mode and start-up operation, setting the second alternating current-direct current micro-grid converter to be in a power control mode and start-up operation, performing subsequent test according to a formulated test routine, recording operation data of tested equipment in real time by an upper computer during the test, completing shutdown of all equipment after the test, opening all the switches, continuing the subsequent test if the test is passed, replacing the tested equipment if the test is not passed, and restarting the test;
step 4: performing a power control function test, closing a first alternating current switch, a second alternating current switch, a third alternating current switch, a fourth direct current switch and a fifth direct current switch, keeping the sixth direct current switch to be disconnected, setting a second alternating current-direct current micro-grid converter to be in a direct current voltage stabilizing mode and starting up to operate, setting the first alternating current-direct current micro-grid converter to be in a power control mode and starting up to operate, performing subsequent tests according to a formulated test routine, recording operation data of tested equipment in real time by an upper computer during the test, completing shutdown of all equipment after the test, disconnecting all switches, continuing the subsequent tests if the test is passed, replacing the tested equipment if the test is not passed, and restarting the test;
step 5: and (3) performing power quality control function test, namely closing a first alternating current switch, a second alternating current switch and a third alternating current switch, keeping a fourth direct current switch, a fifth direct current switch and a sixth direct current switch to be disconnected, setting the first alternating current-direct current micro-grid converter to be in a direct current voltage-stabilizing mode and starting up to operate, setting the second alternating current-direct current micro-grid converter to be in the direct current voltage-stabilizing mode and starting up to operate, starting a harmonic source function of the second alternating current-direct current micro-grid converter by using an upper computer, starting the power quality control function of the first alternating current-direct current micro-grid converter by using the upper computer, performing subsequent test according to a formulated test routine, recording operation data of tested equipment in real time by the upper computer during the test, completing shutdown and disconnection of all the equipment after the test, if the test is passed, testing is qualified, completing the test, replacing the next tested equipment, and restarting the test if the test is failed.
Further, in the direct current voltage stabilizing function test, the 380V power grid supplies power to the 380V alternating current bus of the opposite-pulling part, the first alternating current-direct current micro-grid converter is used as a direct current power supply, power is taken from the 380V alternating current bus, the second alternating current-direct current micro-grid converter is used as a direct current load, electric energy is fed back to the 380V alternating current bus, and the 380V power grid only needs to provide electric energy lost by the opposite-pulling part due to loss.
Further, in the ac voltage stabilizing function test, the third ac/dc micro-grid converter is used as a dc power supply to supply power to the 750V dc bus of the opposite-pulling portion, the first ac/dc micro-grid converter is used as an ac power supply to take power from the 750V dc bus, the second ac/dc micro-grid converter is used as an ac load to feed back the electric energy to the 750V dc bus, the third ac/dc micro-grid converter only needs to provide the electric energy lost by the opposite-pulling portion, and the 380V power grid only needs to provide the electric energy lost by the opposite-pulling portion and the third ac/dc micro-grid converter.
Further, according to the power control function test, a 380V power grid supplies power to a 380V alternating current bus of a towed part, the 380V alternating current bus supplies power to alternating current ports of a first alternating current-direct current micro-grid converter and a second alternating current-direct current micro-grid converter, the second alternating current-direct current micro-grid converter is used as a direct current power supply to supply power to the direct current ports of the first alternating current-direct current micro-grid converter, the first alternating current-direct current micro-grid converter plays a role in power control between the alternating current ports and the direct current ports, electricity is taken from the 380V alternating current bus, according to power control requirements, electric energy is finally fed back to the 380V alternating current bus through the second alternating current-direct current micro-grid converter and an isolation transformer in a forward power mode, and in a reverse power mode, the electric energy is fed back to the 380V alternating current bus through the first alternating current-direct current micro-grid converter. The 380V grid only needs to provide power lost to the towed portion due to losses.
Further, in the power quality control function test, the 380V power grid supplies power to the 380V alternating current bus of the towed part, the second alternating current-direct current micro-grid converter is used as a harmonic source, power is taken from the 380V alternating current bus and generates certain reactive current, unbalanced current and harmonic current, the first alternating current-direct current micro-grid converter is used as a power quality control device, power is taken from the 380V alternating current bus and performs reactive compensation, unbalanced compensation and harmonic control, and the 380V power grid only needs to provide power lost to the towed part due to loss.
Further, in the dc voltage stabilizing function test, the first ac/dc micro-grid converter is used as a dc power supply, the second ac/dc micro-grid converter is used as a dc load, and the test routine can test the voltage stabilizing precision, dynamic performance, overload capacity, temperature rise condition and reliability of full-power operation and bidirectional switching performance of power flow of the dc power supply.
Further, in the ac voltage stabilizing function test, the first ac/dc micro-grid converter is used as an ac power supply, the second ac/dc micro-grid converter is used as an ac load, and the test routine can test the voltage precision, the frequency progress and the voltage harmonic distortion rate of the ac power supply.
Further, in the power control function test, the first ac/dc micro-grid converter plays a role in controlling power between the ac port and the dc port, and the test routine tests control accuracy and response time of the power control.
Further, in the power quality control function test, the first ac/dc micro-grid converter is used as a power quality control device, the second ac/dc micro-grid converter is used as a harmonic source, and the test routine can test the control precision and response time of reactive compensation, unbalance compensation and harmonic control of the power quality control device.
Further, the recorded data of the upper computer comprises real-time power grid voltage, power grid frequency, active power of equipment, reactive power, alternating current of equipment, direct current of equipment and equipment fault information.
The beneficial technical effects of the invention are as follows:
1. the test platform for the AC/DC micro-grid converter is free from other expensive DC power supplies and test instruments except for a necessary 380V AC power supply, an AC switch, a DC switch and a connecting cable, the DC voltage stabilizing function of the AC/DC micro-grid converter is used as a DC power supply, the high-performance AC current control of the AC/DC micro-grid converter is used as a harmonic source, and the real-time recording of the operation data of the tested equipment is realized by utilizing the sampling of the AC/DC micro-grid converter and a developed upper computer, so that the test platform has the remarkable advantages of low cost and easiness in construction.
2. The test method of the opposite-dragging test platform of the AC/DC micro-grid converter not only needs necessary switching operation and carrying and wiring of the tested equipment, but also realizes automatic test of a test routine by utilizing the developed upper computer and has the advantages of simplicity in operation and high automation degree.
3. In the full-power opposite-dragging test of the AC/DC micro-grid converter, the test system only consumes a small amount of energy which does not exceed 10% of rated capacity, so that the full-power opposite-dragging test system has the advantages of electricity saving and environmental protection.
Drawings
Fig. 1 is a schematic diagram of the topology and control of the main circuit of the ac/dc microgrid converter according to the present invention.
Fig. 2 is a schematic diagram of a trawling test platform of the ac/dc microgrid converter of the present invention.
Fig. 3 is a flowchart of a test method of the opposite-dragging test platform of the ac/dc micro-grid converter of the present invention.
Description of the embodiments
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The main circuit topology and the control schematic diagram of the AC/DC micro-grid converter applied by the invention are shown in figure 1, the main circuit is a three-phase three-level DC/AC topology, the main circuit is connected with a DC port and an AC port, a three-level DC bus is formed by connecting two capacitors in series, a three-phase three-level inverter bridge is matched with the three-level DC bus to realize three-level output, an LCL filter realizes the filtering function of the AC port, and the main flow of control realization is realized from the sampling of key signals, through specific control logic and finally to the driving of a switching tube. The display screen realizes a good man-machine interaction function, the upper computer has a powerful debugging function, and can directly control the working mode of the AC/DC micro-grid converter, monitor the DC side voltage, AC voltage measurement, residual current, equipment operating power, equipment temperature and AC voltage measurement frequency of the AC/DC micro-grid converter in real time. The AC/DC micro-grid converter has three working modes of a DC voltage stabilizing mode, an AC voltage stabilizing mode and a power control mode, and respectively realizes the DC voltage stabilizing function, the AC voltage stabilizing function and the power control function, and the electric energy quality control function utilizes the residual capacity of the AC/DC micro-grid converter and realizes reactive compensation, unbalance compensation and harmonic control of the AC micro-grid by means of the detection of the current of a power grid and a high-performance current control technology.
A schematic diagram of a trawling test platform of the AC/DC micro-grid converter of the invention is shown in FIG. 2, and comprises a power supply part and a trawling part.
The power supply part comprises a 380V power grid, an alternating current switch S1, an alternating current/direct current micro-grid converter 3 and a direct current switch S6, wherein the 380V power grid provides an alternating current power supply for a 380V alternating current bus of the opposite-pulling part through the alternating current switch S1, the 380V power grid is connected with an alternating current port of the alternating current/direct current micro-grid converter 3, and the direct current micro-grid converter 3 generates 750V voltage and provides a direct current power supply for a 750V direct current bus of the opposite-pulling part through the direct current switch S6. The opposite dragging part comprises a 380V alternating current bus, a 750V direct current bus, an alternating current-direct current micro-grid converter 1, an alternating current-direct current micro-grid converter 2 and an isolation transformer, wherein the 380V alternating current bus is connected with an alternating current port of the alternating current-direct current micro-grid converter 1 through an alternating current switch S2, the 380V alternating current bus is connected with an alternating current port of the alternating current-direct current micro-grid converter 2 through an alternating current switch S3 and the isolation transformer in sequence, and a 750V direct current bus is connected with a direct current port of the alternating current-direct current micro-grid converter 1 through a direct current switch S4, and the 750V direct current bus is connected with a direct current port of the alternating current-direct current micro-grid converter 2 through a direct current switch S5.
Two AC/DC micro-grid converters of the opposite-dragging part, one is the tested equipment and runs under full power under various functions, the other is auxiliary testing equipment, a power flow path is provided for the tested equipment, and the power circulates in the two equipment of the opposite-dragging part to realize opposite-dragging test. The AC/DC micro-grid converters 1, 2 and 3 have consistent topology and control, and the AC/DC micro-grid converter 2 has a harmonic source function and can output reactive power, unbalance and harmonic current.
The isolation transformer realizes isolation, breaks the circulation of the split part and suppresses electromagnetic interference.
Different topological connections can be realized by different closing and opening combinations of the alternating current switches S1, S2 and S3 and the direct current switches S4, S5 and S6, full power tests with different functions are realized, and the full power test device has the overcurrent protection function.
The test platform for the AC/DC micro-grid converter is free from other expensive DC power supplies and test instruments except for a necessary 380V AC power supply, an AC switch, a DC switch and a connecting cable, the DC voltage stabilizing function of the AC/DC micro-grid converter is used as a DC power supply, the high-performance AC current control of the AC/DC micro-grid converter is used as a harmonic source, and the real-time recording of the operation data of the tested equipment is realized by utilizing the sampling of the AC/DC micro-grid converter and a developed upper computer, so that the test platform has the remarkable advantages of low cost and easiness in construction.
The invention relates to a test method of a butt-towing test platform of an AC/DC micro-grid converter, which is shown in figure 3 and comprises the following steps:
step 1: and (3) constructing a trawling test platform, and confirming that all the equipment is turned off and all the switches are turned off, accessing the AC/DC micro-grid converter 1 of the equipment to be tested, wherein the AC/DC micro-grid converters 2 and 3 serve as auxiliary test equipment, and are the equipment which passes the test.
Step 2: performing direct current voltage stabilizing function test, closing S1, S2, S3, S4 and S5, keeping S6 open, setting an alternating current-direct current micro-grid converter 1 to be in a direct current voltage stabilizing mode and starting up to operate, setting an alternating current-direct current micro-grid converter 2 to be in a power control mode and starting up to operate, performing subsequent test according to a formulated test routine, recording operation data of tested equipment in real time by an upper computer during the test, completing shutdown of all equipment after the test, opening all switches, continuing to perform the subsequent test if the test is passed, replacing the tested equipment if the test is not passed, and restarting the test;
step 3: performing alternating current voltage stabilizing function test, closing S2, S3, S4, S5 and S6, keeping S1 open, setting an alternating current-direct current micro-grid converter 3 to be in a direct current voltage stabilizing mode and starting up to operate, setting an alternating current-direct current micro-grid converter 1 to be in an alternating current voltage stabilizing mode and starting up to operate, setting the alternating current-direct current micro-grid converter 2 to be in a power control mode and starting up to operate, performing subsequent test according to a formulated test routine, recording operation data of tested equipment in real time by an upper computer during the test, completing all equipment shutdown and all switches disconnection after the test, if the test passes, continuing the subsequent test, if the test does not pass, replacing the tested equipment, and restarting the test;
step 4: performing power control function test, closing S1, S2, S3, S4 and S5, keeping S6 open, setting the AC/DC micro-grid converter 2 to be in a DC voltage stabilizing mode and starting up to operate, setting the AC/DC micro-grid converter 1 to be in a power control mode and starting up to operate, performing subsequent test according to a formulated test routine, recording operation data of tested equipment in real time by an upper computer during the test, completing shutdown of all equipment after the test, opening all switches, continuing to perform the subsequent test if the test is passed, replacing the tested equipment if the test is not passed, and restarting the test;
step 5: and (3) performing power quality control function test, closing S1, S2 and S3, keeping S4, S5 and S6 open, setting the AC/DC micro-grid converter 1 to be in a DC voltage stabilizing mode and starting up to operate, setting the AC/DC micro-grid converter 2 to be in a DC voltage stabilizing mode and starting up to operate, starting the harmonic source function of the AC/DC micro-grid converter 2 by using an upper computer, starting the power quality control function of the AC/DC micro-grid converter 1 by using the upper computer, performing subsequent test according to a formulated test routine, recording the operation data of tested equipment in real time by the upper computer during the test, completing shutdown of all equipment after the test, opening all switches, if the test passes, completing the test, replacing the next tested equipment, and restarting the test if the test does not pass.
In the full-power opposite-dragging test of the AC/DC micro-grid converter, the test system only consumes a small amount of energy which does not exceed 10% of rated capacity, so that the full-power opposite-dragging test system has the advantages of electricity saving and environmental protection.
In the DC voltage stabilizing function test, a 380V power grid supplies power to a 380V alternating current bus of the opposite-dragging part, an alternating current-direct current micro-grid converter 1 is used as a DC power supply, power is taken from the 380V alternating current bus, an alternating current-direct current micro-grid converter 2 is used as a DC load, electric energy is fed back to the 380V alternating current bus, and the 380V power grid only needs to provide electric energy lost by the opposite-dragging part due to loss.
In the test of the alternating current voltage stabilizing function, the alternating current-direct current micro-grid converter 3 is used as a direct current power supply to supply power to a 750V direct current bus of the opposite-dragging part, the alternating current-direct current micro-grid converter 1 is used as an alternating current power supply to take power from the 750V direct current bus, the alternating current-direct current micro-grid converter 2 is used as an alternating current load to feed the electric energy back to the 750V direct current bus, the alternating current-direct current micro-grid converter 3 only needs to provide the electric energy lost by the opposite-dragging part, and the 380V power grid only needs to provide the electric energy lost by the opposite-dragging part and the alternating current-direct current micro-grid converter 3.
In the power control function test, a 380V power grid supplies power to a 380V alternating current bus of a towed part, the 380V alternating current bus supplies power to alternating current ports of alternating current-direct current micro-grid converters 1 and 2, the alternating current-direct current micro-grid converter 2 is used as a direct current power supply to supply power to direct current ports of the alternating current-direct current micro-grid converter 1, the alternating current-direct current micro-grid converter 1 plays a role in controlling power between the alternating current ports and the direct current ports, power is taken from the 380V alternating current bus, and finally the power is fed back to the 380V alternating current bus through the alternating current-direct current micro-grid converter 1 and an isolation transformer, and the 380V power grid only needs to provide electric energy lost by the towed part due to loss.
In the power quality control function test, a 380V power grid supplies power to a 380V alternating current bus of a towed part, an alternating current/direct current micro-grid converter 2 is used as a harmonic source, power is taken from the 380V alternating current bus and generates certain reactive current, unbalanced current and harmonic current, an alternating current/direct current micro-grid converter 1 is used as a power quality control device, power is taken from the 380V alternating current bus and carries out reactive compensation, unbalanced compensation and harmonic control, and the 380V power grid only needs to provide power lost to the towed part due to loss.
The test method of the opposite-dragging test platform of the AC/DC micro-grid converter not only needs necessary switching operation and carrying and wiring of the tested equipment, but also realizes automatic test of a test routine by utilizing the developed upper computer and has the advantages of simplicity in operation and high automation degree.
In the test of the direct current voltage stabilizing function, the alternating current-direct current micro-grid converter 1 is used as a direct current power supply, the alternating current-direct current micro-grid converter 2 is used as a direct current load, and the test routine can fully test the voltage stabilizing precision, the dynamic performance, the overload capacity, the temperature rise condition of full-power operation, the reliability and the bidirectional switching performance of power flow of the direct current power supply.
In the test of the alternating current voltage stabilizing function, the alternating current-direct current micro-grid converter 1 is used as an alternating current power supply, the alternating current-direct current micro-grid converter 2 is used as an alternating current load, and the test routine can fully test the voltage precision, the frequency progress and the voltage harmonic distortion rate of the alternating current power supply.
In the power control function test, the ac/dc micro-grid converter 1 plays a role in power control between an ac port and a dc port, and a test routine can sufficiently test the control accuracy and response time of the power control.
In the power quality control function test, the AC/DC micro-grid converter 1 is used as a power quality control device, the AC/DC micro-grid converter 2 is used as a harmonic source, and the test routine can fully test the reactive compensation, unbalance compensation and harmonic control precision and response time of the power quality control device.
The above embodiments are illustrative of the specific embodiments of the present invention, and not restrictive, and various changes and modifications may be made by those skilled in the relevant art without departing from the spirit and scope of the invention, so that all such equivalent embodiments are intended to be within the scope of the invention.
Claims (15)
1. The utility model provides a pair of test platform that drags of AC/DC microgrid converter which characterized in that includes power supply part and pair drags part:
the power supply section includes: the system comprises a 380V power grid, a first alternating current switch, a third alternating current/direct current micro-grid converter and a sixth direct current switch, wherein the 380V power grid provides an alternating current power supply for a 380V alternating current bus of the opposite dragging part through the first alternating current switch, the 380V power grid is connected with an alternating current port of the third alternating current/direct current micro-grid converter, and the third direct current micro-grid converter generates 750V voltage and provides a direct current power supply for a 750V direct current bus of the opposite dragging part through the sixth direct current switch;
the butt-towing part comprises: the system comprises a 380V alternating current bus, a 750V direct current bus, a first alternating current-direct current micro-grid converter, a second alternating current-direct current micro-grid converter, an isolation transformer, a second alternating current switch, a third alternating current switch, a fourth alternating current switch and a fifth alternating current switch, wherein the 380V alternating current bus is connected with an alternating current port of the first alternating current-direct current micro-grid converter through the second alternating current switch, the 380V alternating current bus is connected with an alternating current port of the second alternating current-direct current micro-grid converter through the third alternating current switch and the isolation transformer in sequence, the 750V direct current bus is connected with a direct current port of the first alternating current-direct current micro-grid converter through the fourth direct current switch, the 750V direct current bus is connected with a direct current port of the second alternating current-direct current micro-grid converter through the fifth direct current switch, and the first alternating current-direct current-current micro-grid converter is used for sampling the 380V alternating current bus three-phase power grid current through three alternating current sampling lines, so that the power grid voltage can be obtained before the second alternating current switch is not turned on, and normal starting of equipment is ensured.
2. The platform for testing the opposite-dragging of the AC/DC micro-grid converter according to claim 1, wherein the AC/DC micro-grid converter is of a three-phase three-level DC/AC topology, the main circuit comprises a DC port, a DC bus capacitor, a three-phase three-level inverter bridge, an LCL filter, an AC port and a control system, and the first AC/DC micro-grid converter, the second AC/DC micro-grid converter and the third AC/DC micro-grid converter have consistent topologies and control systems.
3. The platform for testing the trawling of the ac/dc micro-grid converter according to claim 1, wherein the ac/dc micro-grid converter has three working modes: the system comprises a direct current voltage stabilizing mode, an alternating current voltage stabilizing mode and a power control mode, wherein the direct current voltage stabilizing mode is used for direct current voltage stabilization and electric energy quality management, the alternating current voltage stabilizing mode is used for alternating current voltage stabilization, the power control mode is used for power control between alternating current and direct current, and the first alternating current-direct current micro-grid converter, the second alternating current-direct current micro-grid converter and the third alternating current-direct current micro-grid converter all have three working modes, wherein the second alternating current-direct current micro-grid converter has a harmonic source function and can output reactive power, unbalance and harmonic current.
4. The platform for testing the opposite-pulling of the AC/DC micro-grid converter according to claim 1, wherein the isolation transformer achieves an isolation function, breaks the circulation of the opposite-pulling part and inhibits electromagnetic interference.
5. The platform for testing the opposite-dragging of the AC/DC micro-grid converter according to claim 1, wherein different combinations of the first AC switch, the second AC switch, the third AC switch, the fourth DC switch, the fifth DC switch and the sixth DC switch can realize different topological connection, realize full-power testing with different functions and have the function of overcurrent protection.
6. A test method for a butt-towing test platform of an AC/DC micro-grid converter specifically comprises the following steps:
step 1: constructing a trawling test platform, and confirming that all devices are turned off and all switches are turned off, and accessing a first AC/DC micro-grid converter, a second AC/DC micro-grid converter and a third AC/DC micro-grid converter of the device to be tested as auxiliary test devices, wherein the auxiliary test devices are devices which pass the test;
step 2: performing a direct current voltage stabilizing function test, closing a first alternating current switch, a second alternating current switch, a third alternating current switch, a fourth direct current switch and a fifth direct current switch, keeping the sixth direct current switch to be disconnected, setting a first alternating current-direct current micro-grid converter to be in a direct current voltage stabilizing mode and starting up to operate, setting a second alternating current-direct current micro-grid converter to be in a power control mode and starting up to operate, performing subsequent tests according to a formulated test routine, recording operation data of tested equipment in real time by an upper computer during the test, completing shutdown of all equipment after the test, disconnecting all switches, continuing the subsequent tests if the test passes, replacing the tested equipment if the test does not pass, and restarting the test;
step 3: performing alternating current voltage stabilizing function test, closing a second alternating current switch, a third alternating current switch, a fourth direct current switch, a fifth direct current switch and a sixth direct current switch, keeping the first alternating current switch open, setting a third alternating current-direct current micro-grid converter to be in a direct current voltage stabilizing mode and start-up operation, setting the first alternating current-direct current micro-grid converter to be in an alternating current voltage stabilizing mode and start-up operation, setting the second alternating current-direct current micro-grid converter to be in a power control mode and start-up operation, performing subsequent test according to a formulated test routine, recording operation data of tested equipment in real time by an upper computer during the test, completing shutdown of all equipment after the test, opening all the switches, continuing the subsequent test if the test is passed, replacing the tested equipment if the test is not passed, and restarting the test;
step 4: performing a power control function test, closing a first alternating current switch, a second alternating current switch, a third alternating current switch, a fourth direct current switch and a fifth direct current switch, keeping the sixth direct current switch to be disconnected, setting a second alternating current-direct current micro-grid converter to be in a direct current voltage stabilizing mode and starting up to operate, setting the first alternating current-direct current micro-grid converter to be in a power control mode and starting up to operate, performing subsequent tests according to a formulated test routine, recording operation data of tested equipment in real time by an upper computer during the test, completing shutdown of all equipment after the test, disconnecting all switches, continuing the subsequent tests if the test is passed, replacing the tested equipment if the test is not passed, and restarting the test;
step 5: and (3) performing power quality control function test, namely closing a first alternating current switch, a second alternating current switch and a third alternating current switch, keeping a fourth direct current switch, a fifth direct current switch and a sixth direct current switch to be disconnected, setting the first alternating current-direct current micro-grid converter to be in a direct current voltage-stabilizing mode and starting up to operate, setting the second alternating current-direct current micro-grid converter to be in the direct current voltage-stabilizing mode and starting up to operate, starting a harmonic source function of the second alternating current-direct current micro-grid converter by using an upper computer, starting the power quality control function of the first alternating current-direct current micro-grid converter by using the upper computer, performing subsequent test according to a formulated test routine, recording operation data of tested equipment in real time by the upper computer during the test, completing shutdown and disconnection of all the equipment after the test, if the test is passed, testing is qualified, completing the test, replacing the next tested equipment, and restarting the test if the test is failed.
7. The test method of the test platform for the opposite-dragging of the AC/DC micro-grid converter according to claim 6, wherein the DC voltage stabilizing function test is characterized in that a 380V power grid supplies power to a 380V AC bus of the opposite-dragging part, the first AC/DC micro-grid converter is used as a DC power supply, power is taken from the 380V AC bus, the second AC/DC micro-grid converter is used as a DC load, electric energy is fed back to the 380V AC bus, and the 380V power grid only needs to provide electric energy lost by the opposite-dragging part due to loss.
8. The test method of the test platform for the opposite-dragging of the AC/DC micro-grid converter according to claim 6, wherein the test method is characterized in that the AC voltage stabilizing function test is performed, the third AC/DC micro-grid converter is used as a DC power supply to supply power to a 750V DC bus of the opposite-dragging part, the first AC/DC micro-grid converter is used as an AC power supply to take power from the 750V DC bus, the second AC/DC micro-grid converter is used as an AC load to feed the power back to the 750V DC bus, the third AC/DC micro-grid converter only needs to provide the power lost by the opposite-dragging part, and the 380V power grid only needs to provide the power lost by the opposite-dragging part and the third AC/DC micro-grid converter.
9. The test method of the test platform for the opposite-dragging of the AC/DC micro-grid converter according to claim 6, wherein the test of the power control function is characterized in that a 380V power grid supplies power to a 380V AC bus of an opposite-dragging part, the 380V AC bus supplies power to AC ports of the first AC/DC micro-grid converter and the second AC/DC micro-grid converter, the second AC/DC micro-grid converter serves as a DC power supply to supply power to the DC ports of the first AC/DC micro-grid converter, the first AC/DC micro-grid converter plays a role in controlling power between the AC ports and the DC ports, power is taken from the 380V AC bus, electric energy is finally fed back to the 380V AC bus through the second AC/DC micro-grid converter and an isolation transformer in a forward power mode according to the power control requirement, and the electric energy is fed back to the 380V AC bus through the first AC/DC micro-grid converter in a reverse power mode. The 380V grid only needs to provide power lost to the towed portion due to losses.
10. The test method of the opposite-dragging test platform of the AC/DC micro-grid converter according to claim 6, wherein the electric energy quality control function test is characterized in that a 380V electric network supplies power to a 380V AC bus of an opposite-dragging part, a second AC/DC micro-grid converter is used as a harmonic source, power is taken from the 380V AC bus and generates a certain reactive current, unbalanced current and harmonic current, a first AC/DC micro-grid converter is used as an electric energy quality control device, power is taken from the 380V AC bus and reactive compensation, unbalanced compensation and harmonic control are carried out, and the 380V electric network only needs to provide electric energy lost by the opposite-dragging part due to loss.
11. The method for testing the trawling test platform of the ac/dc micro-grid converter according to claim 6, wherein the dc voltage stabilizing function is tested, the first ac/dc micro-grid converter is used as a dc power supply, the second ac/dc micro-grid converter is used as a dc load, and the test routine tests the voltage stabilizing precision, dynamic performance, overload capacity, temperature rise and reliability of full-power operation and bidirectional switching performance of power flow of the dc power supply.
12. The method for testing the trawling test platform of the ac/dc micro-grid converter according to claim 6, wherein the ac voltage stabilizing function is tested, the first ac/dc micro-grid converter is used as an ac power source, the second ac/dc micro-grid converter is used as an ac load, and the test routine tests voltage accuracy, frequency progress and voltage harmonic distortion rate of the ac power source.
13. The method for testing the trawling test platform of the ac/dc micro-grid converter according to claim 6, wherein the power control function is tested, the first ac/dc micro-grid converter plays a role in controlling power between an ac port and a dc port, and the test routine tests control accuracy and response time of the power control.
14. The method for testing a trawling test platform for an ac/dc micro-grid converter according to claim 6, wherein the power quality control function is tested, the first ac/dc micro-grid converter is used as a power quality control device, the second ac/dc micro-grid converter is used as a harmonic source, and the test routine tests the reactive compensation, unbalance compensation, control accuracy of harmonic control and response time of the power quality control device.
15. The method for testing the trawling test platform of the ac/dc micro-grid converter according to claim 6, wherein the recorded data of the upper computer comprises real-time grid voltage, grid frequency, active power, reactive power of equipment, ac current of equipment, dc side current of equipment and equipment fault information.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837765A (en) * | 2013-09-17 | 2014-06-04 | 株洲南车时代电气股份有限公司 | Energy-regeneration type converter power test system and method |
| CN106093628A (en) * | 2016-06-01 | 2016-11-09 | 国电南京自动化股份有限公司 | A kind of regenerative braking energy feedback current transformer testing method |
| CN208015609U (en) * | 2017-11-09 | 2018-10-26 | 西安冠特宸电源系统有限公司 | A kind of high-power AC-DC continuous-current plants and test device |
| CN109298255A (en) * | 2017-07-24 | 2019-02-01 | 株洲中车时代电气股份有限公司 | A kind of subway energy feedback current transformer power examination test system and method |
| CN113419128A (en) * | 2021-06-29 | 2021-09-21 | 中国华能集团清洁能源技术研究院有限公司 | Converter aging test platform and working method thereof |
| CN217717936U (en) * | 2022-01-28 | 2022-11-01 | 山东泰开高压开关有限公司 | Large-capacity voltage source converter drag test platform |
-
2023
- 2023-02-10 CN CN202310095199.XA patent/CN116184082A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837765A (en) * | 2013-09-17 | 2014-06-04 | 株洲南车时代电气股份有限公司 | Energy-regeneration type converter power test system and method |
| CN106093628A (en) * | 2016-06-01 | 2016-11-09 | 国电南京自动化股份有限公司 | A kind of regenerative braking energy feedback current transformer testing method |
| CN109298255A (en) * | 2017-07-24 | 2019-02-01 | 株洲中车时代电气股份有限公司 | A kind of subway energy feedback current transformer power examination test system and method |
| CN208015609U (en) * | 2017-11-09 | 2018-10-26 | 西安冠特宸电源系统有限公司 | A kind of high-power AC-DC continuous-current plants and test device |
| CN113419128A (en) * | 2021-06-29 | 2021-09-21 | 中国华能集团清洁能源技术研究院有限公司 | Converter aging test platform and working method thereof |
| CN217717936U (en) * | 2022-01-28 | 2022-11-01 | 山东泰开高压开关有限公司 | Large-capacity voltage source converter drag test platform |
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