Comprehensive test system for alternating-current mobile power station

Abstract

The invention discloses a comprehensive test system for an alternating-current mobile power station. A power supply unit is electrically connected with a mains supply power supply and used for supplying power to the comprehensive test system. The load distribution unit is connected with a to-be-tested alternating current mobile power station, and an acquisition unit is arranged between the load distribution unit and the to-be-tested alternating current mobile power station; the load distribution unit is used for providing various simulation loads for the alternating current mobile power station to be tested according to the loading instruction of the control calculation unit; the acquisition unit is used for acquiring a simulation test signal under a corresponding simulation load and outputting the simulation test signal to the control calculation unit; the control calculation unit performs test calculation according to the simulation test signal to obtain a performance test result of the to-be-tested AC mobile power station under the corresponding simulation load, and the AC mobile power station comprehensive test system solves the problems that the existing AC mobile power station load test equipment is large in size and low in test efficiency through integrated modular design. The problems of multiple types of equipment required for completing steady-state test and transient test, low load reuse rate, single load simulation characteristic and poor test universality in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of power parameter testing, and particularly to a comprehensive test system for an AC mobile power station. Background Art

[0002] An AC mobile power station is an indispensable power supply equipment in modern industrial applications. In order to ensure the stable and reliable electrical performance of the AC mobile power station, strict tests are required for its R & D, production debugging, factory inspection and maintenance to ensure its various functions and performance indicators.

[0003] The commissioning and testing of an AC mobile power station are generally completed using analog load devices. Most of these loads are resistive loads, and the analog load devices can be dry loads, water loads or electronic loads. However, traditional analog load devices have a single function. Especially when conducting steady-state tests, transient tests, etc. specified in GB / T 1029-2005 "Test Methods for Three-Phase Synchronous Motors", on the basis of correctly loading the analog load device, a variety of additional test and analysis devices are required to complete the entire test process. The equipment connection is complex, and multiple people are required to cooperate in the operation. In addition, the storage, processing and analysis of test data are relatively cumbersome. In addition, when the AC mobile power station is loaded with a load similar to a motor load, it will exhibit strong inductive load characteristics, and the load needs to have the characteristics of simulating inductive loads. At present, due to the large number of models and complex varieties of AC mobile power stations, with the continuous improvement of the requirements for work efficiency and use convenience, the problems existing in the prior art include:

[0004] 1. For the load test equipment of the AC mobile power station, there are problems such as large volume, many types of equipment required for steady-state tests and transient tests, scattered layout, complex wiring, difficulty in moving and transferring fields, low load reuse rate, and poor test versatility.

[0005] 2. Existing test equipment mostly consists of pure resistive loads, with a single load simulation characteristic, limited load characteristics that can be simulated, and difficulty in upgrading and transformation. When facing new requirements, it often needs to be customized again. Summary of the Invention

[0006] The present invention provides a comprehensive test system for an AC mobile power station to overcome the above technical problems.

[0007] To achieve the above object, the technical solution of the present invention is:

[0008] A comprehensive test system for an AC mobile power station includes a control and calculation unit, a collection unit, a load distribution unit, and a power supply unit installed inside a waterproof cabinet;

[0009] The power supply unit is electrically connected to the mains power supply through a power supply bus to supply power to the comprehensive test system;

[0010] The load distribution unit is connected to the AC mobile power station to be tested through a three-phase input busbar, and a collection unit is provided between the load distribution unit and the AC mobile power station to be tested; and the load distribution unit and the collection unit are respectively connected to the control and calculation unit;

[0011] The control and calculation unit is used to generate a loading instruction according to the simulated load demand and transmit the loading instruction to the load distribution unit;

[0012] The load distribution unit is used to provide various simulated loads for the AC mobile power station to be tested according to the loading instruction of the control and calculation unit; the collection unit is used to collect the simulated test signals under the corresponding simulated loads and output them to the control and calculation unit;

[0013] The control and calculation unit is also used to perform test calculations according to the simulated test signals to test the test results characterizing the output power and load-carrying capacity of the corresponding AC mobile power station to be tested;

[0014] The test calculations include but are not limited to steady-state tests and transient tests;

[0015] And the test results at least include the active power, reactive power, power factor, high-order harmonics, voltage regulation rate, frequency regulation rate, and voltage fluctuation rate of the AC mobile power station to be tested.

[0016] Further, the load distribution unit includes a load combination module, a fan combination module, a temperature sensor, a contactor array, and an intermediate relay array;

[0017] The load combination module includes a resistive load composed of multiple alloy resistor elements and an inductive load composed of multiple inductance elements;

[0018] The contactor array is connected to the AC mobile power station to be tested through a three-phase input busbar, the output end of the intermediate relay array is electrically connected to the contactor array, and the output end of the contactor array is respectively connected to the load combination module and the fan combination module;

[0019] The contactor array is provided with multiple groups of fuses and contactors corresponding to the resistive load or inductive load. The input end of the intermediate relay array is connected to the control and calculation unit. The control and calculation unit is used to control the phase sequence of the intermediate relay array to drive the contactors corresponding to the phase sequence of the contactor array to open or close to obtain the corresponding load combination;

[0020] The temperature sensor is used to obtain the temperature signal inside the waterproof cabinet and transmit the temperature signal to the control and calculation unit. The control and calculation unit obtains a control instruction according to the temperature signal and controls the fan combination module through the intermediate relay array and the contactor array in sequence to realize the cooling closed-loop control operation.

[0021] Further, the acquisition unit includes a power acquisition module and a synchronous acquisition board card electrically connected to the power acquisition module; the power acquisition module is connected to the three-phase input bus between the load distribution unit and the AC mobile power station to be tested;

[0022] And the power acquisition module is provided with a plurality of high-speed voltage sensors and high-speed current sensors,

[0023] The high-speed voltage sensor is used to collect the instantaneous voltage value on the three-phase input bus;

[0024] The high-speed current sensor is used to collect the instantaneous current value on the three-phase input bus in the form of a transformer;

[0025] The synchronous acquisition board card is used to synchronously collect the instantaneous voltage value and the instantaneous current value of the high-speed voltage sensor and the high-speed current sensor according to the acquisition instruction issued by the control calculation unit.

[0026] Further, the power supply unit includes a power conversion module, a power module and a power distribution protection device;

[0027] The input end of the power conversion module is electrically connected to a certain phase of the input bus, and the output of the power conversion module is electrically connected to the power supply bus of the AC mobile power station comprehensive test system. The power conversion module is used to provide power backup for the AC mobile power station comprehensive test system;

[0028] And the method for the power conversion module to provide power backup for the AC mobile power station comprehensive test system is: when the mains power supply is cut off, the power conversion module converts the electric energy of a certain phase in the input bus of the AC mobile power station to be tested into electric energy with the same characteristics as the mains power supply to supply power to the AC mobile power station comprehensive test system;

[0029] The input end of the power distribution protection device is electrically connected to the power supply bus, and is used to provide power supply protection for the AC mobile power station comprehensive test system;

[0030] The output end of the power distribution protection device is electrically connected to the input end of the power module, and the output end of the power module is respectively connected to the acquisition unit and the control calculation unit, and is used to provide a first voltage for the acquisition unit and a second voltage for the control calculation unit.

[0031] Further, the control calculation unit includes an industrial computer, an EtherCAT coupler, a digital I / O module, an analog input module and a communication module;

[0032] The industrial computer is respectively connected to the acquisition unit and the Ethernet card. The Ethernet card is used to establish communication between the industrial computer and the remote server, and operate the industrial computer through the remote server to realize the simulation test of the AC mobile power station to be tested;

[0033] The industrial computer is connected to the EtherCAT coupler through the EtherCAT bus;

[0034] The EtherCAT coupler is respectively connected to the digital I / O module, the analog input module and the communication module through the E-bus;

[0035] And the communication module is used as a communication expansion interface for the control calculation unit;

[0036] The input end of the analog input module is connected to the temperature sensor of the load distribution unit, and is used to obtain the analog temperature signal of the temperature sensor, and transmit the analog temperature signal to the industrial computer through the EtherCAT coupler;

[0037] The digital I / O module is used to output the digital signal of the load control instruction generated by the industrial computer to the load distribution unit, and drive the contactor array through the intermediate relay array to realize the loading of the load combination;

[0038] And the control of the fan combination is used to realize the cooling of the AC mobile power station integrated test system.

[0039] Furthermore, it further includes a control panel button combination;

[0040] One end of the control panel button combination is connected to the power distribution protection device, and the other end is connected to the digital I / O module;

[0041] The control panel button combination is provided with buttons corresponding to various analog loads in the load distribution unit. The state signals of the corresponding analog loads are sent to the control calculation unit through the digital I / O module through the control panel button combination to realize the manual control loading of the analog loads for the load combination.

[0042] Beneficial effects: The present invention provides an integrated test system for an AC mobile power station. The load distribution unit provides various simulated loads for the AC mobile power station to be tested according to the loading instructions of the control calculation unit; and according to the acquisition unit arranged between the load distribution unit and the AC mobile power station to be tested, the simulated test signals of the AC mobile power station to be tested under each simulated load are collected and output to the control calculation unit; the control calculation unit conducts simulated tests according to the simulated test signals to obtain the output power of the AC mobile power station to be tested under the corresponding simulated load and the test results of the load-carrying capacity. The integrated test system for the AC mobile power station solves the problems of large volume of the existing load test equipment for the AC mobile power station, the need for a large variety of equipment for steady-state testing and transient testing, scattered layout, complex wiring, difficulty in moving and transferring, low load reuse rate, and poor test versatility through modular integrated design; and through the load distribution unit, various load states can be simulated, solving the problem of single load simulation characteristics of traditional load test equipment and improving the versatility of the integrated test of the AC mobile power station. Description of the Drawings

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0044] Figure 1 It is a schematic structural diagram of an integrated test system for an AC mobile power station of the present invention;

[0045] Figure 2 It is a power supply and distribution system diagram of an integrated test system for an AC mobile power station of the present invention;

[0046] Figure 3 It is a schematic principle diagram of an integrated test system for an AC mobile power station of the present invention.

[0047] In the figure: 1, control calculation unit; 2, acquisition unit; 3, load distribution unit; 4, power supply unit; 5, waterproof cabinet; 6, load-bearing mobile chassis; 7, control panel button combination; 8, industrial computer; 10, communication module; 11, digital I / O module; 12, analog input module; 13, Ethernet card; 15, power quantity acquisition module; 16, synchronous acquisition board; 17, load combination unit; 18, fan combination unit; 19, contactor array; 21, intermediate relay array; 23, power supply module; 24, power distribution protection device; 158, power conversion module; 253, EtherCAT coupler; 259, temperature sensor; 287, test cable; 299, working power supply line; 300, AC mobile power station to be tested; 301, mains power supply. Specific embodiments

[0048] For the purposes, technical solutions and advantages of the embodiments of the present invention to be more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the scope of protection of the present invention.

[0049] This embodiment provides a comprehensive test system for an AC mobile power station, as Figures 1 to 2 shown, which includes a control computing unit 1, a collection unit 2, a load distribution unit 3, and a power supply unit 4 installed inside a waterproof cabinet 5; and a load-bearing mobile chassis 6 is installed below the waterproof cabinet 5, which can reliably carry the entire comprehensive test system for the AC mobile power station and is convenient for mobile transfer. The comprehensive test system for the AC mobile power station is a modular integrated compact structure, with simple wiring and convenient use; specifically, the load-bearing mobile chassis 6 contains load-bearing legs and mobile wheels, which carry the weight of the entire waterproof cabinet 5 and are convenient for mobile deployment;

[0050] Specifically, the load distribution unit 3 includes a load combination module 17, a fan combination module 18, a temperature sensor 259, a contactor array 19, and an intermediate relay array 21;

[0051] The load combination module 17 includes a resistive load composed of multiple alloy resistance elements and an inductive load composed of multiple inductance elements;

[0052] The contactor array 19 is connected to the AC mobile power station to be tested through a three-phase input busbar. The output end of the intermediate relay array 21 is electrically connected to the contactor array 19, and the output end of the contactor array 19 is respectively connected to the load combination module 17 and the fan combination module 18;

[0053] The contactor array 19 is provided with multiple groups of fuses and contactors corresponding to the resistive load or inductive load. The input end of the intermediate relay array 21 is connected to the control computing unit 1. The control computing unit 1 is used to control the phase sequence of the intermediate relay array 21, driving the opening or closing of the contactors corresponding to the phase sequence of the contactor array 19 to obtain the corresponding load combination; among them, the fuse is to protect the circuit controlled by each contactor correspondingly, and when the current exceeds the preset alarm value, the fuse will blow;

[0054] The temperature sensor 259 is used to obtain the temperature signal inside the waterproof cabinet 5 and transmit the temperature signal to the control calculation unit 1. The control calculation unit 1 obtains the control instruction according to the temperature signal, and controls the fan combination module 18 through the intermediate relay array 21 and the contactor array 19 in turn to realize the cooling closed-loop control operation.

[0055] In this embodiment, the load combination 17 includes multiple groups of alloy resistor elements as resistive loads and multiple groups of inductor elements as inductive loads. Specifically, the power generated by the AC mobile power station 300 to be tested flows from the high-voltage input terminal into the input busbar through the test cable 287 and reaches the contactor array 19. The contactor array 19 includes multiple fuses and contactors. The number of groups of fuses and contactors (72 groups) is the same as the sum of the number of groups of alloy resistor elements (36 groups) and the number of groups of inductor elements (36 groups) connected in three-phase angles; specifically, each phase alloy resistor acting as a resistive load is divided into 12 grades, and the size of each grade is 0.1kw, 0.2kw, and 12kw, respectively. , 0.2kw, 0.5kw, 1kw, 2kw, 2kw, 5kw, 10kw, 20kw, 20kw, 50kw, the inductance of each phase acting as inductive load is divided into 12 grades, and the size of each grade is 0.1kvar, 0.2kvar, 0.2kvar, 0.5kvar, 1kvar, 2kvar, 2kvar, 5kvar, 10kvar, 20kvar, 20kvar, 50kvar, the three-phase resistive load and inductive load have 36 grades respectively, the three-phase resistive load of each gear adopts a triangle connection method, and the three-phase inductive load of each gear also adopts a triangle connection method. The load gears are divided into parallel stages and step loading is achieved by contactors. The loading signal is sent by the Beckhoff EL2008 of the digital I / O module 11 in the control calculation unit 1 through the industrial computer 8, and the corresponding contactors are controlled by the intermediate relay array 21 to achieve loading action. The resistive load can be loaded in steps based on 0.1kW, and the inductive load can be loaded in steps based on 0.1kVar. In this embodiment, the temperature sensor 259 is used to monitor the working temperature of the load combination 17 and transmit it to the control calculation unit 1. The control calculation unit 1 receives the data of the temperature sensor 259 and provides feedback data to the fan combination 18 to realize closed-loop control. The signal of the temperature sensor 259 is fed back to the analog input module 12EL3061 of the control calculation unit 1, and finally input into the industrial computer 8 for judgment with the preset temperature threshold, and obtains the fan control instruction which is sent to the intermediate relay array 21 and the contactor array 19 in sequence. The fan combination 18 is also controlled by the phase sequence automatic switching device of the contactor array 19, and the fan combination 18 has 4 groups of heat dissipation fans for accelerating the heat dissipation of the load combination 17.

[0056] The control computing unit 1 includes an industrial computer 8, an EtherCAT coupler 253, a digital I / O module 11, an analog input module 12, and a communication module 10;

[0057] The industrial computer 8 is respectively connected to the acquisition unit 2 and the Ethernet card. The Ethernet card is used to establish communication between the industrial computer 8 and a remote server, and operate the industrial computer 8 through the remote server to implement the simulation test of the AC mobile power station to be tested;

[0058] The industrial computer 8 is respectively connected to the digital I / O module 11, the analog input module 12, and the communication module 10 through the EtherCAT coupler 253; the control computing unit 1 is used to generate a loading instruction according to the simulated load demand and transmit the loading instruction to the load distribution unit 3; among them, the calculation method for the control computing unit 1 to generate a loading instruction according to the load demand is realized by existing well-known technical means and will not be elaborated here;

[0059] And the communication module 10 is used as a communication expansion interface of the control computing unit 1;

[0060] The input end of the analog input module 12 is connected to the temperature sensor 259 of the load distribution unit 3, and is used to obtain the analog temperature signal of the temperature sensor 259 and transmit the analog temperature signal to the industrial computer 8 through the EtherCAT coupler 253;

[0061] The digital I / O module 11 is used to output the digital signal of the loading control instruction generated by the industrial computer 8 to the load distribution unit 3, drive the contactor array 19 through the intermediate relay array 21 to realize the loading of the load combination 17, and drive the contactor array 19 through the intermediate relay array 21 to control the fan combination 18 to realize the cooling of the AC mobile power station comprehensive test system.

[0062] In this embodiment, the industrial computer 8 is a Beckhoff CP2200 panel touch screen all-in-one computer, which supports multi-touch, has two idle PCI-e slots, supports running the TwinCAT development soft PLC platform under Windows 7 Professional, and has two independent network ports suitable for developing the EtherCAT master station function. In addition, in this embodiment, a PCI-e Ethernet network card 13 is selected and inserted into the PCI-e slot of the industrial computer 8 to expand the Ethernet port, so that the AC mobile power station comprehensive test system has the functions of multi-machine parallel connection networking and remote server control test; and in this embodiment, the EtherCAT coupler 253 is a Beckhoff EK1100, which is electrically connected to the industrial computer 8 as an EtherCAT slave station to maintain communication. In this embodiment, the digital output digital I / O module 11 is a Beckhoff EL2008, the digital input digital I / O module 11 is a Beckhoff EL1008, the analog input module 12 is a Beckhoff EL3061, and the communication module 10 is a Beckhoff EL6751 CAN module. The above Beckhoff EL2008, EL1008, EL3061, and EL6751 modules are sequentially inserted and mounted on the EtherCAT coupler 253 EK1100 in the form of an E-BUS bus, and together with the industrial computer 8 relying on the EtherCAT bus, a control computing unit 1 hardware platform with multiple digital I / O inputs, multiple digital I / O outputs, multiple analog inputs, and CAN bus communication is formed. On the basis of the above control computing unit 1 hardware platform, the TwinCAT automation software development soft PLC platform of Beckhoff is run, and functions such as logic control, data acquisition, and communication are realized through PLC programming languages that conform to the IEC 61131-1 standard. The TwinCAT automation software realizes efficient interaction with LabVIEW through ADS, and efficiently develops a visual test page in LabVIEW with an operator framework. Its test page can configure standardized automatic test processes and manual test processes according to GB / T 1029-2005 "Test Methods for Three-Phase Synchronous Motors", supports one-key testing, can add and delete parameters, supports modifying pass criteria, saves test data, and generates and displays test result charts. Among them, the programming programs for logic control, data acquisition, and communication in the PLC programming language that conforms to the IEC 61131-1 standard are all realized through existing well-known technologies, and will not be elaborated here.

[0063] The power supply unit 4 is electrically connected to the mains power supply through a power supply bus to supply power to the comprehensive test system;

[0064] Specifically, the power supply unit 4 includes a power conversion module 158, a power module 23, and a power distribution protection device 24;

[0065] The input end of the power conversion module 158 is electrically connected to a certain phase of the input bus, and the output of the power conversion module 158 is electrically connected to the power supply bus of the AC mobile power station comprehensive test system. The power conversion module 158 is used to provide power backup for the AC mobile power station comprehensive test system;

[0066] The method for the power conversion module 158 to provide power backup for the AC mobile power station comprehensive test system is as follows: when the mains power is normal, the mains power supply 301 is used for power supply; when the mains power supply is cut off, the power conversion module 158 converts the electrical energy of a certain phase in the input bus of the AC mobile power station to be tested into electrical energy with the same characteristics as the mains power supply to supply power to the AC mobile power station comprehensive test system;

[0067] The input end of the power distribution protection device 24 is electrically connected to the power supply bus and is used for the power supply protection of the AC mobile power station comprehensive test system;

[0068] The output end of the power distribution protection device 24 is electrically connected to the input end of the power module 23, and the output end of the power module 23 is respectively connected to the acquisition unit 2 and the control and calculation unit 1, and is used to provide a first voltage (DC±15V) for the power consumption acquisition module 15 of the acquisition unit 2, and provide a second voltage (DC24V) for the industrial computer 8, the EtherCAT coupler 253 of the control and calculation unit 1, and the synchronous acquisition board 16 of the acquisition unit 2.

[0069] In this embodiment, a control panel button combination 7 is further included, and one end of the control panel button combination 7 is connected to the power distribution protection device 24, and the other end is connected to the digital I / O module 11; the power distribution protection device 24 provides AC220V voltage to supply power to the control panel button combination 7. The control panel button combination 7 is provided with buttons corresponding to various analog loads in the load distribution unit 3, and the state signals of the corresponding analog loads are sent to the control and calculation unit 1 through the digital I / O module by the control panel button combination 7 to realize the manual control of loading analog loads for the load combination.

[0070] Specifically, the control panel button combination 7 is 72 groups of illuminated self-locking buttons, which correspond one-to-one to the load grading states of the load combination 17. The load grading states are input by the Beckhoff EL1008 of the digital I / O module 11 in the control and calculation unit 1, and the manual control of the analog load state is realized by inputting a load control signal to the load combination unit 17 in the industrial computer 8.

[0071] In this embodiment, the waterproof cabinet 5 is mechanically connected to the above-mentioned functional units such as the control and calculation unit 1, the acquisition unit 2, the load distribution unit 3, the power supply unit 4, and the control panel button combination 7, providing an internal installation space and electrical connection slots for them. The touch screen of the industrial computer 8 and the control panel button combination 7 are distributed in the operation area of the surface of the waterproof cabinet 5 and are respectively mechanically connected to this area, providing a good man-machine operation interface.

[0072] The load distribution unit 3 is connected to the AC mobile power station to be tested through a three-phase input busbar. An acquisition unit 2 is provided between the load distribution unit 3 and the AC mobile power station to be tested; and the load distribution unit 3 and the acquisition unit 2 are respectively connected to the control and calculation unit 1;

[0073] The load distribution unit 3 is used to provide a variety of simulated loads for the AC mobile power station to be tested according to the loading instruction of the control and calculation unit 1; the acquisition unit 2 is used to acquire the simulated test signals under the corresponding simulated loads and output them to the control and calculation unit 1;

[0074] Specifically, the acquisition unit 2 includes an electric quantity acquisition module 15 and a synchronous acquisition board 16 electrically connected to the electric quantity acquisition module 15; the electric quantity acquisition module 15 is connected to the three-phase input busbar between the load distribution unit 3 and the AC mobile power station to be tested;

[0075] And the electric quantity acquisition module 15 is provided with three high-speed voltage sensors and three high-speed current sensors (the high-speed current sensor is the ITN900-S Ultrastab high-speed current sensor of LEM in Switzerland, and the high-speed voltage sensor is the CV3-1000 of LEM in Switzerland); the high-speed voltage sensors are used to acquire the instantaneous voltage values Uu, Uv, Uw on the three-phase input busbar; the high-speed current sensors are used to acquire the instantaneous current values Iu, Iv, Iw on the three-phase input busbar in the form of transformers; the synchronous acquisition board 16 is used to synchronously acquire the instantaneous voltage values and instantaneous current values of the high-speed voltage sensors and high-speed current sensors according to the acquisition instruction issued by the control and calculation unit 1.

[0076] The control and calculation unit 1 is also used to perform test calculations according to the simulated test signals to test the test results characterizing the output power and load-carrying capacity of the corresponding AC mobile power station to be tested;

[0077] The test calculations include but are not limited to steady-state tests and transient tests;

[0078] And the test results at least include the active power, reactive power, power factor, high-order harmonics, voltage regulation rate, frequency regulation rate, and voltage fluctuation rate of the AC mobile power station to be tested

[0079] The working process is as Figure 3As shown, the AC mobile power station comprehensive test system is electrically connected to the mains power supply 301 through the working power cord 299 and to the AC mobile power station 300 to be tested through the test cable 287. Specifically, the mobile power station 300 to be tested generates electricity and is transmitted to the load distribution unit 3 through the test cable 287 and the input bus in sequence. The loading process, loading actions, and protection measures of the load distribution unit 3 are controlled by signals given by the control calculation unit 1 or the control panel button combination 7 to achieve the desired resistive load or inductive load loading for the AC mobile power station 300 to be tested;

[0080] For the resistive load simulation, the three-phase delta-connected alloy resistance elements include 12 selectable gears in Table 1:

[0081] Table 1. Resistive Load Simulation Loading Table

[0082]

[0083] For the inductive load simulation, the three-phase delta-connected inductance elements include 12 selectable gears in Table 2:

[0084] Table 2. Inductive Load Simulation Loading Table

[0085]

[0086]

[0087] The load-carrying capacity of the AC mobile power station 300 to be tested is tested according to the pre-compiled test program to obtain the performance test results. Then, the test results are processed by the test software set in the industrial computer 8 and displayed in the form of graphs and tables on the industrial computer 8's industrial control panel touch screen, or transmitted to the remote server operation test page through the Ethernet port.

[0088] For example: When performing the load combination 17 inductive load loading simulation, it can be calculated through the reactive power calculation formula: The reactive power Q of load combination 17 = U2 / (2*π*f*L) (where Q represents reactive power, the unit is kvar, π≈3.14, f represents the frequency of the AC mobile power station 300 to be tested, the unit is Hz, U represents the line voltage of the AC mobile power station 300 to be tested, the unit is V; L represents the load for inductive load loading simulation).

[0089] Then, the loading is controlled by the test software of the control calculation unit 1 or manually controlled by the control panel button combination 7, or the control instructions of the remote computer are received through the Ethernet card 13 to complete the performance test of the AC mobile power station 300 to be tested.

[0090] When the power factor is 1, it is to simulate a pure resistive load. 17 alloy resistors are loaded in the load combination. The test results of some gears are shown in Table 3 as follows:

[0091] Table 3. Test results of pure resistive load simulation of the AC mobile power station to be tested

[0092]

[0093] Among them, u, v, and w represent the three-phase voltages of phase u, phase v, and phase w. For example, the line current of the AC mobile power station to be tested is represented by the current Iu / A.

[0094] When the power factor is not 1, it is to simulate the combined resistive and inductive load. 17 alloy resistors and inductors are loaded in the load combination. The test results of some gears are shown in Table 4 as follows:

[0095] Table 4. Test results of load simulation of the AC mobile power station to be tested

[0096]

[0097] Compared with the prior art, the advantages of the present invention are as follows:

[0098] 1. The present invention adopts an integrated design, with a small and compact volume, streamlined equipment, centralized operation, supports all steady-state and transient test items specified by the national standard, has convenient wiring, and supports mobile transfer;

[0099] 2. The present invention has a high degree of informatization, realizes the automated and intelligent testing of the AC mobile power station based on Ethernet. Users can achieve one-key testing by calling the stored test procedures that meet the national standard requirements. Users can also modify the test procedures. The test has good versatility, the test system can be calibrated at any time, and the test accuracy is high;

[0100] 3. The main control equipment inside the present invention applies the EtherCAT bus, which has good real-time performance and is very suitable for expanding more functional modules to make the functions more complete, facilitating later upgrade and transformation according to needs;

[0101] 4. The present invention is applicable to AC mobile power stations, can simulate the characteristics of resistive loads and inductive loads, and provides convenience for the designers and producers of mobile power stations and the logistics technical support personnel in the design and production, factory inspection of AC mobile power stations, as well as various logistics support performance tests and fault diagnosis tasks;

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An AC mobile power station comprehensive test system, characterized in that, It includes a control computing unit (1), a collection unit (2), a load distribution unit (3), and a power supply unit (4) installed inside a waterproof cabinet (5); The power supply unit (4) is electrically connected to the mains power supply through a power supply bus to supply power to the integrated test system; The load distribution unit (3) is connected to the AC mobile power station to be tested through a three-phase input bus. A collection unit (2) is provided between the load distribution unit (3) and the AC mobile power station to be tested; and the load distribution unit (3) and the collection unit (2) are respectively connected to the control computing unit (1); The control computing unit (1) is used to generate a loading instruction according to the simulated load demand and transmit the loading instruction to the load distribution unit (3); The load distribution unit (3) is used to provide multiple simulated loads for the AC mobile power station to be tested according to the loading instruction of the control computing unit (1); the collection unit (2) is used to collect the simulated test signals under the corresponding simulated loads and output them to the control computing unit (1); The control computing unit (1) is further used to perform test calculations according to the simulated test signals to test the test results characterizing the output power and load-carrying capacity of the corresponding AC mobile power station to be tested; The test calculations include but are not limited to steady-state tests and transient tests; And the test results at least include the active power, reactive power, power factor, high-order harmonics, voltage regulation rate, frequency regulation rate, and voltage fluctuation rate of the AC mobile power station to be tested.

2. The integrated test system for an AC mobile power station according to claim 1, characterized in that The load distribution unit (3) includes a load combination module (17), a fan combination module (18), a temperature sensor (259), a contactor array (19), and an intermediate relay array (21); The load combination module (17) includes a resistive load composed of multiple alloy resistance elements and an inductive load composed of multiple inductance elements; The contactor array (19) is connected to the AC mobile power station to be tested through a three-phase input bus. The output end of the intermediate relay array (21) is electrically connected to the contactor array (19), and the output end of the contactor array (19) is respectively connected to the load combination module (17) and the fan combination module (18); The contactor array (19) is provided with multiple groups of fuses and contactors corresponding to the resistive load or inductive load. The input end of the intermediate relay array (21) is connected to the control computing unit (1). The control computing unit (1) is used to control the phase sequence of the intermediate relay array (21) to drive the contactors corresponding to the phase sequence of the contactor array (19) to turn on or off to obtain the corresponding load combination; The temperature sensor (259) is used to obtain the temperature signal inside the waterproof cabinet (5) and transmit the temperature signal to the control computing unit (1). The control computing unit (1) obtains a control instruction according to the temperature signal and controls the fan combination module (18) through the intermediate relay array (21) and the contactor array (19) in sequence to realize the cooling closed-loop control operation.

3. The integrated test system for an AC mobile power station according to claim 2, wherein The acquisition unit (2) includes a power acquisition module (15) and a synchronous acquisition board (16) electrically connected to the power acquisition module (15); the power acquisition module (15) is connected to the three-phase input bus between the load distribution unit (3) and the AC mobile power station to be tested; and the power acquisition module (15) is provided with a plurality of high-speed voltage sensors and high-speed current sensors, the high-speed voltage sensors are used to collect the instantaneous voltage values on the three-phase input bus; the high-speed current sensors are used to collect the instantaneous current values on the three-phase input bus; the synchronous acquisition board (16) is used to synchronously collect the instantaneous voltage values and instantaneous current values of the high-speed voltage sensors and high-speed current sensors according to the acquisition instructions issued by the control calculation unit (1).

4. The integrated test system for an AC mobile power station according to claim 3, wherein, The power supply unit (4) includes a power conversion module (158), a power module (23) and a power distribution protection device (24); the input end of the power conversion module (158) is electrically connected to a certain phase of the input bus, the output of the power conversion module (158) is electrically connected to the power supply bus of the AC mobile power station comprehensive test system, and the power conversion module (158) is used to provide power supply backup for the AC mobile power station comprehensive test system; and the method for the power conversion module (158) to provide power supply backup for the AC mobile power station comprehensive test system is: when the mains power supply is cut off, the power conversion module (158) converts the electrical energy of a certain phase in the input bus of the AC mobile power station to be tested into electrical energy with the same characteristics as the mains power supply to supply power to the AC mobile power station comprehensive test system; the input end of the power distribution protection device (24) is electrically connected to the power supply bus, and is used to provide power supply protection for the AC mobile power station comprehensive test system; the output end of the power distribution protection device (24) is electrically connected to the input end of the power module (23), and the output end of the power module (23) is respectively connected to the acquisition unit (2) and the control calculation unit (1), and is used to provide a first voltage for the acquisition unit (2) and a second voltage for the control calculation unit (1).

5. The integrated test system for an AC mobile power station according to claim 4, characterized in that The control calculation unit (1) includes an industrial computer (8), an EtherCAT coupler (253), a digital I / O module (11), an analog input module (12) and a communication module (10); the industrial computer (8) is respectively connected to the acquisition unit (2) and an Ethernet card (13), and the Ethernet card (13) is used to establish communication between the industrial computer (8) and a remote server, and operate the industrial computer (8) through the remote server to realize the simulation test of the AC mobile power station to be tested; the industrial computer (8) is connected to the EtherCAT coupler (253) through an EtherCAT bus; the EtherCAT coupler (253) is respectively connected to the digital I / O module (11), the analog input module (12) and the communication module (10) through an E-bus; and the communication module (10) is used as a communication expansion interface of the control calculation unit (1); The input end of the analog input module (12) is connected to the temperature sensor (259) of the load distribution unit (3), and is used to acquire the analog temperature signal of the temperature sensor (259), and transmit the analog temperature signal to the industrial computer (8) through the EtherCAT coupler; The digital I / O module (11) is used to output the digital signal of the load control instruction generated by the industrial computer (8) to the load distribution unit (3), and drive the contactor array (19) through the intermediate relay array (21) to realize the loading of the load combination (17); And the control of the fan combination (18) realizes the cooling of the AC mobile power station comprehensive test system.

6. The integrated test system for an AC mobile power station according to claim 5, wherein, It also includes a control panel button combination (7); One end of the control panel button combination (7) is connected to the power distribution protection device (24), and the other end is connected to the digital I / O module (11); The control panel button combination (7) is provided with buttons corresponding to various analog loads in the load distribution unit (3), and the status signal of the corresponding analog load is sent to the control calculation unit (1) through the digital I / O module by the control panel button combination (7) to realize the manual control loading of the analog load for the load combination.

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