A system and method for ac-ac power transfer device energy efficiency detection

Abstract

The application discloses a kind of system and method for AC-AC electric energy transmission device energy efficiency detection, the system includes energy efficiency detection workbench and remote control terminal, and energy efficiency detection workbench includes input terminal and output terminal, and energy efficiency detection loop is arranged inside integration, and energy efficiency detection loop includes sampling voltage transformer, sampling current transformer, sampling resistance, data acquisition module, signal digital-analog conversion module, main control board and line switching module;The remote control terminal is connected with main control board, and is used to generate test report according to the energy efficiency detection detection characteristic quantity obtained by main control board.The system of the application is convenient to use, saves manpower and material resources, guarantees the safety of test personnel, improves test efficiency and accuracy.

Description

Technical Field

[0001] This application belongs to the field of power transmission efficiency testing technology, and relates to a system and method for testing the efficiency of AC-AC power transmission devices. Background Technology

[0002] Energy is the material foundation of national economic development, and long-term supply and demand forecasts indicate that the supply-demand imbalance remains significant. To promote energy conservation throughout society, improve energy efficiency, protect and improve the environment, and foster comprehensive, coordinated, and sustainable economic and social development, my country encourages and supports the development and application of energy-saving products and technologies.

[0003] Energy conservation is an important part of energy saving. With the development and application of many cutting-edge technologies and new materials, it has become a reality to effectively control electricity costs and save energy through high-tech means, and energy-saving technologies and devices have begun to become widespread.

[0004] Currently, there is a lack of testing equipment for comprehensive energy efficiency testing and other operational electrical parameters testing of alternating current power transmission devices such as energy-saving devices, transformers, and AC charging piles. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a system and method for energy efficiency testing of AC-AC power transmission devices. This system and method meet the market demand for comprehensive energy efficiency testing and other operational electrical parameter testing of AC-AC power transmission devices such as energy-saving devices, transformers, and AC charging piles. The goal is to improve energy management service capabilities, promote energy-saving technology advancements, enhance the energy efficiency of AC charging piles and other devices, and increase energy utilization.

[0006] The present invention adopts the following technical solution.

[0007] A system for energy efficiency testing of AC-AC power transmission devices includes an energy efficiency testing workbench and a remote control terminal. The energy efficiency testing workbench includes input terminals and output terminals, and integrates an energy efficiency testing circuit. The energy efficiency testing circuit includes a sampling voltage transformer, a sampling current transformer, a sampling resistor, a data acquisition module, a signal digital-to-analog conversion module, a main control board, and a line switching module.

[0008] The input and output terminals are used to connect the input and output terminals of the AC-AC power transmission device under test.

[0009] The sampling voltage transformer is connected in parallel with the input and output terminals and is also connected to the data acquisition module;

[0010] The sampling current transformer is connected in series with the input and output terminals, and is connected to the data acquisition module through a sampling resistor;

[0011] The main control board is connected to the data acquisition module through the signal digital-to-analog conversion module to obtain the sampling voltage transformer and sampling current transformer data collected by the data acquisition module and calculate the energy efficiency detection characteristic quantity accordingly.

[0012] The main control board is also connected to the line switching module. The main control board controls the line switching module to switch the voltage transformer sampling mode according to the input voltage wiring method of the AC-AC power transmission device under test in order to perform load and no-load energy efficiency detection and control.

[0013] The remote control terminal is connected to the main control board and is used to generate a test report based on the energy efficiency detection characteristics obtained from the main control board.

[0014] Preferably, the input terminals include three-phase input terminals XTA1, XTB1, and XTC1;

[0015] The output terminals include three-phase output terminals XTA2, XTB2, and XTC2;

[0016] When performing energy efficiency testing, the input terminal of the AC-AC power transmission device under test is connected to the three-phase input terminals XTA1, XTB1, XTC1 and the grounding terminal XTN1, and the output terminal of the AC-AC power transmission device under test is connected to the three-phase output terminals XTA2, XTB2, XTC2 and the grounding terminal XTN2.

[0017] Preferably, the sampling voltage transformer includes three input voltage sampling units TV01 to TV03 and three output voltage sampling units TV04 to TV06;

[0018] Among them, one end of the primary winding of TV01 is connected to the A phase line of the input terminal of the AC-AC power transmission device under test, and the other end is connected to the B phase line and neutral line of the input terminal of the AC-AC power transmission device under test through the upper and lower terminals of contactor KM05.

[0019] One end of the primary winding of TV02 is connected to the B phase line of the input terminal of the AC-AC power transmission device under test, and the other end is connected to the C phase line and neutral line of the input terminal of the AC-AC power transmission device under test through the upper and lower terminals of contactor KM05.

[0020] One end of the primary winding of TV03 is connected to the C-phase line of the input terminal of the AC-AC power transmission device under test, and the other end is connected to the A-phase line and neutral line of the input terminal of the AC-AC power transmission device under test through the upper and lower terminals of contactor KM05.

[0021] When the AC-AC power transmission device under test is a three-phase three-wire power supply, the upper row of terminals of KM05 is connected and the lower row of terminals is disconnected. TV01, TV02, and TV03 measure the line voltage between the AB, BC, and AC phase lines.

[0022] When the test subject is a three-phase four-wire power supply, the upper row of terminals of KM05 is open and the lower row of terminals is closed. TV01, TV02, and TV03 measure the voltage of phases AN, BN, and CN.

[0023] One end of the primary winding of TV04 is connected to the A-phase line of the output terminal of the AC-AC power transmission device under test, and the other end is connected to the B-phase line and neutral line of the output terminal of the AC-AC power transmission device under test through the upper and lower terminals of contactor KM06.

[0024] One end of the primary winding of TV05 is connected to the B phase line of the output terminal of the AC-AC power transmission device under test, and the other end is connected to the C phase line and neutral line of the output terminal of the AC-AC power transmission device under test through the upper and lower terminals of contactor KM06.

[0025] One end of the primary winding of TV06 is connected to the C-phase line of the output terminal of the AC-AC power transmission device under test, and the other end is connected to the A-phase line and neutral line of the output terminal of the AC-AC power transmission device under test through the upper and lower terminals of contactor KM06.

[0026] When the AC-AC power transmission device under test is a three-phase three-wire power supply, the upper row of terminals of KM06 is connected and the lower row of terminals is disconnected. TV04, TV05, and TV06 measure the line voltage between the AB, BC, and AC phase lines.

[0027] When the test subject is a three-phase four-wire power supply, the upper row of terminals of KM06 is open and the lower row of terminals is closed. TV04, TV05, and TV06 measure the voltage of phases AN, BN, and CN.

[0028] The sampling current transformer includes three input current sampling units TA01 to TA03 and three output current sampling units TA04 to TA06;

[0029] Among them, TA01 to TA03 are connected in series on lines A, B, and C at the input end of the AC-AC power transmission device under test;

[0030] TA04 to TA06 are connected in series on lines A, B, and C at the output of the AC-AC power transmission device under test.

[0031] Preferably, the voltage sampling unit is connected to the data acquisition module;

[0032] The current sampling unit is connected to the data acquisition module after being connected to the sampling resistor;

[0033] The data acquisition module is connected to the signal digital-to-analog conversion module. It obtains the sampled voltage value through analog-to-digital conversion and transmits the sampled voltage value to the main control board connected to the signal digital-to-analog conversion module. The main control board measures and calculates the sampled voltage value to obtain the energy efficiency detection characteristic quantity and transmits it to the remote control terminal.

[0034] Preferably, the line switching module includes a circuit breaker QF01 and AC contactors KM01 to KM04, wherein the circuit breaker QF01 is connected in series between TA01 to TA03 and TV01 to TV03, the AC contactors KM03 to KM04 are connected in series between TA04 to TA06 and TV04 to TV06, and the AC contactors KM01 to KM02 are connected in series between the circuit breaker QF01 and the AC contactors KM03 to KM04. During energy efficiency testing, circuit breaker QF01 is in the closed state. Contactors KM01 to KM04 are controlled by the main control board to close or open according to the load or no-load energy efficiency test items. When contactors KM01 to KM02 are open and KM03 to KM04 are closed, the AC-AC power transmission device under test is in a loaded state. When contactors KM03 to KM04 are open and KM01 to KM02 are closed, the AC-AC power transmission device under test is in a no-load state.

[0035] Preferably, the remote control terminal includes a remote control host, which includes a data management module, a system settings module, and other functional modules;

[0036] The data management module is used for data management of the AC-AC power transmission device under test.

[0037] The system settings module is used to set communication parameters, printing error limits, energy conversion efficiency limits, default power saving test time, default load power, load range percentage, and report generation information.

[0038] The other functional modules are used for data extraction, report printing, data backup and recovery.

[0039] Preferably, the energy efficiency testing workbench is also equipped with red, green, and yellow alarm lights on its surface;

[0040] The alarm light is connected to the main control board;

[0041] A red light illuminates when energy efficiency exceeds the set value.

[0042] The yellow light illuminates when the energy efficiency is at the set value.

[0043] When the energy efficiency is lower than the set value, the green light will illuminate.

[0044] A method for energy efficiency testing of AC-AC power transmission devices includes the following steps:

[0045] SS1: The energy efficiency testing workbench is connected to the power supply and load device. The control board controls the circuit switching module to connect the energy efficiency testing circuit. The voltage and current amplitude and phase of the energy efficiency testing circuit before the AC-AC power transmission device under test are connected are obtained through the sampling voltage transformer, sampling current transformer, sampling resistor, data acquisition module, and signal digital-to-analog conversion module.

[0046] SS2: Connect the input and output terminals of the AC-AC power transmission device under test to the input and output terminals of the energy efficiency testing workbench, respectively. The main control board controls the circuit switching module to connect the AC-AC power transmission device under test to the energy efficiency testing circuit and to the load state. The amplitude and phase of the voltage and current at the input and output terminals of the AC-AC power transmission device under test under load state are obtained through the sampling voltage transformer, sampling current transformer, sampling resistor, data acquisition module, and signal digital-to-analog conversion module.

[0047] SS3: The main control board calculates the load energy efficiency detection characteristic quantity based on the amplitude and phase of the voltage and current at the input and output terminals of the AC-AC power transmission device under load conditions after it is connected to the test.

[0048] SS4: The main control board controls the circuit switching module to connect the AC-AC power transmission device under test to the energy efficiency detection circuit, and it is in an unloaded state. The sampling voltage transformer, sampling current transformer, sampling resistor, data acquisition module, and signal digital-to-analog conversion module obtain the amplitude and phase of the voltage and current at the input and output terminals of the AC-AC power transmission device under test in the unloaded state after connection. The main control board measures and calculates them to obtain the unloaded energy efficiency detection characteristic quantity.

[0049] SS5: The remote control terminal generates a test report based on the energy efficiency detection characteristics of the AC-AC power transmission device before and after connection.

[0050] Preferably, the load energy efficiency detection characteristics and the no-load energy efficiency detection characteristics both include the effective values ​​of voltage and current, power factor, active power, reactive power, and energy conversion efficiency at the input and output terminals of the AC-AC power transmission device under test. The effective values ​​of voltage and current at the input and output terminals are directly obtained through sampling voltage transformers and sampling current transformers.

[0051] Preferably, the specific calculation method for each energy efficiency detection characteristic quantity of the test subject under no-load or load conditions is as follows:

[0052] The total active power (W) of the three-phase input of the power supply when the AC-AC power transmission device under test is not connected. 11 =U 1*I1cosφ1; The total reactive power of the three-phase input is W. 12 =U 1* I1sinφ1;

[0053] Among them, U1 and I1 are the voltage and current of the three-phase circuit A, B and C when the AC-AC power transmission device under test is not connected, and the included angle is φ1.

[0054] When the AC-AC power transmission device under test is connected, the total active power of the three-phase input of the power supply is W. 21 =U 2* I²cosφ²; Total reactive power of three-phase input is W 22 =U 2* I2sinφ2;

[0055] When the AC-AC power transmission device under test is connected, the total active power output of the three phases of the power supply is W. 31 =U 3* I3cosφ3; The total reactive power of the three-phase output is W. 32 =U 3* I3sinφ3;

[0056] Among them, U2 and I2 are the input voltage and current of the AC-AC power transmission device under test when it is connected to the energy efficiency detection circuit, and the included angle is φ2.

[0057] U3 and I3 are the voltage and current on the output side of the AC-AC power transmission device under test when it is connected to the energy efficiency detection circuit, and the included angle is φ3.

[0058] The input power factor of the AC-AC power transmission device under test = W 21 / (W 21 +W 22 );

[0059] The output power factor of the AC-AC power transmission device under test = W 31 / (W 31 +W 32 );

[0060] Energy saving rate = (W) 11 -W 21 ) / W 11 ;

[0061] Energy conversion efficiency calculation:

[0062] Energy conversion efficiency = W 31 / W 21 .

[0063] A terminal includes a processor and a storage medium; the storage medium is used to store instructions.

[0064] The processor is configured to operate according to the instructions to execute the steps of the method.

[0065] A computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the steps of the method.

[0066] The beneficial effects of this invention are as follows: Compared with the prior art, this invention proposes a system and method for energy efficiency testing of AC-AC power transmission devices. It integrates sampling, analog-to-digital conversion, and control functions into a single energy efficiency testing workbench. Through simple wiring, it can complete comprehensive energy efficiency testing and other operational electrical parameter testing of AC-AC power transmission devices. This is convenient to use, saves manpower and resources, ensures the safety of testing personnel, and improves testing efficiency and accuracy. By conducting comprehensive energy efficiency testing and other operational electrical parameter testing on AC-AC power transmission devices such as energy-saving devices, transformers, and AC charging piles, it can further enhance the energy management and service capabilities of power grid companies at all levels, promote the advancement of energy-saving technologies, improve the energy efficiency of devices such as AC charging piles, and increase energy utilization. Attached Figure Description

[0067] Figure 1 This is an electrical schematic diagram for energy efficiency testing provided in an embodiment of the present invention;

[0068] Figure 2 This is a schematic diagram of a data acquisition module provided in an embodiment of the present invention;

[0069] Figure 3 This is a block diagram illustrating the energy efficiency testing principle provided in an embodiment of the present invention.

[0070] Figure 4 This is a control principle diagram of the main control board provided in an embodiment of the present invention;

[0071] Figure 5 This is a flowchart of the energy efficiency testing process provided in an embodiment of the present invention. Detailed Implementation

[0072] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, other embodiments obtained by those skilled in the art without creative effort are all within the protection scope of this invention.

[0073] like Figure 1-4As shown, Embodiment 1 of the present invention provides a system for energy efficiency testing of AC-AC power transmission devices, including an energy efficiency testing workbench and a remote control terminal. In a preferred but non-limiting embodiment of the present invention, the energy efficiency testing workbench includes input terminals and output terminals, and an energy efficiency testing circuit is integrated inside. The energy efficiency testing circuit includes a sampling voltage transformer, a sampling current transformer, a sampling resistor, a data acquisition module, a signal digital-to-analog conversion module, a main control board, and a line switching module.

[0074] The input and output terminals are used to connect the AC-AC power transmission device under test, i.e., the input and output terminals of the object under test.

[0075] More preferably, the input terminals include three-phase input terminals XTA1, XTB1, and XTC1;

[0076] The output terminals include three-phase output terminals XTA2, XTB2, and XTC2;

[0077] When performing energy efficiency testing, the input terminal of the AC-AC power transmission device under test is connected to the three-phase input terminals XTA1, XTB1, XTC1 and the grounding terminal XTN1, and the output terminal of the AC-AC power transmission device under test is connected to the three-phase output terminals XTA2, XTB2, XTC2 and the grounding terminal XTN2.

[0078] The sampling voltage transformer is connected in parallel with the input and output terminals and is also connected to the data acquisition module. The TV used for sampling in this invention is a fully insulated voltage transformer that can be used for single-phase grounding (phase voltage measurement) or for two-phase bridging (line voltage measurement). The subsequent relay switching is used to change the connection method to adapt to two types of test objects: three-phase input and three-phase four-wire input.

[0079] More preferably, the sampling voltage transformer includes three high-precision, high-stability input voltage sampling units TV01 to TV03 and three high-precision, high-stability output voltage sampling units TV04 to TV06.

[0080] Among them, TV01 to TV03 are connected in parallel between phases A, B, and C of the input terminal of the AC-AC power transmission device under test; such as Figure 1 As shown, one end of the primary winding of TV01 is connected to the A-phase line of the input terminal of the AC-AC power transmission device under test, and the other end is connected to the B-phase line and neutral line of the input terminal of the AC-AC power transmission device under test through the upper and lower terminals of contactor KM05.

[0081] One end of the primary winding of TV02 is connected to the B phase line of the input terminal of the AC-AC power transmission device under test, and the other end is connected to the C phase line and neutral line of the input terminal of the AC-AC power transmission device under test through the upper and lower terminals of contactor KM05.

[0082] One end of the primary winding of TV03 is connected to the C-phase line of the input terminal of the AC-AC power transmission device under test, and the other end is connected to the A-phase line and neutral line of the input terminal of the AC-AC power transmission device under test through the upper and lower terminals of contactor KM05.

[0083] When the AC-AC power transmission device under test is a three-phase three-wire power supply, the upper row of terminals of KM05 is connected and the lower row of terminals is disconnected. TV01, TV02, and TV03 measure the line voltage between the AB, BC, and AC phase lines.

[0084] When the test subject is a three-phase four-wire power supply, the upper row of terminals of KM05 is open and the lower row of terminals is closed. TV01, TV02, and TV03 measure the voltage of phases AN, BN, and CN.

[0085] When the energy-saving device or energy-saving device under test is powered by a three-phase three-wire (ABC) power supply, TV needs to measure the line voltage between AB, AC, and BC. At this time, the upper row of terminals of KM05 is connected and the lower row of terminals is disconnected. When the energy-saving device or energy-saving device under test is powered by a three-phase four-wire (ABCN) power supply, TV can measure the phase voltage of AN, BN, and CN. At this time, the upper row of terminals of KM05 is disconnected and the lower row of terminals is connected.

[0086] TV04~TV06 are connected in parallel between phases A, B, and C of the output terminal of the AC-AC power transmission device under test; such as Figure 1 As shown, one end of the primary winding of TV04 is connected to the A-phase line of the output terminal of the AC-AC power transmission device under test, and the other end is connected to the B-phase line and neutral line of the output terminal of the AC-AC power transmission device under test through the upper and lower terminals of contactor KM06.

[0087] One end of the primary winding of TV05 is connected to the B phase line of the output terminal of the AC-AC power transmission device under test, and the other end is connected to the C phase line and neutral line of the output terminal of the AC-AC power transmission device under test through the upper and lower terminals of contactor KM06.

[0088] One end of the primary winding of TV06 is connected to the C-phase line of the output terminal of the AC-AC power transmission device under test, and the other end is connected to the A-phase line and neutral line of the output terminal of the AC-AC power transmission device under test through the upper and lower terminals of contactor KM06.

[0089] When the AC-AC power transmission device under test is a three-phase three-wire power supply, the upper row of terminals of KM06 is connected and the lower row of terminals is disconnected. TV04, TV05, and TV06 measure the line voltage between the AB, BC, and AC phase lines.

[0090] When the test subject is a three-phase four-wire power supply, the upper row of terminals of KM06 is open and the lower row of terminals is closed. TV04, TV05, and TV06 measure the voltage of phases AN, BN, and CN.

[0091] The sampling current transformer includes three high-precision, high-stability input current sampling units TA01 to TA03 and three high-precision, high-stability output current sampling units TA04 to TA06.

[0092] Among them, TA01~TA03 are connected in series on the A\B\C lines of the input terminal of the AC-AC power transmission device under test;

[0093] TA04~TA06 are connected in series on the A\B\C lines of the output terminal of the AC-AC power transmission device under test.

[0094] That is, TV01-TV06 are connected in parallel to each phase voltage, and TA01-TA06 are connected in series in each phase circuit.

[0095] The sampling current transformer is connected in series with the input and output terminals, and is connected to the data acquisition module through a sampling resistor;

[0096] The main control board is connected to the data acquisition module through the signal digital-to-analog conversion module to obtain the data (input three-phase voltage, three-phase current and output three-phase voltage, three-phase current) of the sampling voltage transformer and sampling current transformer collected by the data acquisition module, and calculates the energy efficiency detection characteristic quantity based on this.

[0097] More preferably, the voltage sampling unit is connected to the data acquisition module;

[0098] The current sampling unit is connected to the data acquisition module after being connected to the sampling resistor;

[0099] The data acquisition module is connected to the signal digital-to-digital conversion module. It obtains the sampled voltage value through analog-to-digital conversion and transmits the sampled voltage value to the main control board connected to the signal digital-to-digital conversion module. The main control board measures and calculates the sampled voltage value to obtain the energy efficiency detection characteristic quantity and transmits it to the remote control terminal. The waveforms corresponding to the voltage and current can be plotted based on the characteristic quantity transmitted by the main control board, and the energy efficiency of the AC-AC power transmission device under test can be calculated.

[0100] The energy efficiency testing characteristics include the voltage, current, active power, reactive power, power factor, energy saving rate, and energy conversion efficiency of the AC-AC power transmission device under test.

[0101] The main control board is also connected to the line switching module, which is connected to the input and output terminals. This invention needs to compare the power efficiency of the tested devices (energy-saving devices, energy-saving appliances, etc.) under the same load by comparing the connected and unconnected states. Therefore, KM01-KM04 are used for direct connection, and the tested devices (energy-saving devices, energy-saving appliances, etc.) are disconnected. The main control board controls the load and no-load energy efficiency detection and control by controlling the line switching module. Specifically, it controls the switching of the voltage transformer sampling mode (such as phase voltage measurement mode Y-type or line voltage measurement mode V-type) according to the input voltage wiring method (three-phase three-wire or three-phase four-wire) of the tested AC-AC power transmission device (energy-saving appliance, energy-saving device, etc.).

[0102] More preferably, the line switching module includes a circuit breaker QF01 and AC contactors KM01 to KM04. The main control board controls the switching of circuit breaker QF01 and contactors KM01 to KM04. Circuit breaker QF01 is connected in series between TA01 to TA03 and TV01 to TV03. AC contactors KM03 to KM04 are connected in series between TA04 to TA06 and TV04 to TV06. AC contactors KM01 to KM02 are connected in series with circuit breaker QF01 and connected in series with TA01 to TA03 and AC contactors. Between contacts KM03 and KM04; when testing the energy efficiency of the power transmission device, circuit breaker QF01 is in the closed state, and contactors KM01 to KM04 are controlled by the main control board to close or open according to the load or no-load energy efficiency test items. When contactors KM01 to KM02 are open and KM03 to KM04 are closed, the AC-AC power transmission device under test is in a loaded state; when contactors KM03 to KM04 are open and KM01 to KM02 are closed, the AC-AC power transmission device under test is in a no-load state. Here, load and no-load refer to whether the tested object is working (that is, whether the energy-saving device, etc., is under load). When M01 and KM02 are closed, it is equivalent to short-circuiting the tested energy-saving device, etc. At this time, it is directly connected to the load from the power supply, and the energy-saving device is in operation and is in a no-load state.

[0103] The remote control terminal is connected to the main control board and is used to generate a test report based on the energy efficiency detection characteristics obtained from the main control board.

[0104] More preferably, the remote control terminal includes a remote control host, which is divided into three main functional modules: data management, system settings, and other functional modules;

[0105] The data management module is used for data management of the AC-AC power transmission device under test.

[0106] The system settings module is used to set communication parameters, printing error limits, energy conversion efficiency limits, default power saving test time, default load power, load range percentage, and report generation information, etc.

[0107] The other functional modules are used for data extraction, report printing, and data backup and recovery.

[0108] More preferably, the energy efficiency testing workbench is also equipped with red, green, and yellow warning lights on its surface.

[0109] The alarm light is connected to the main control board;

[0110] A red light will illuminate when energy efficiency, such as energy conversion efficiency, exceeds a set value.

[0111] The yellow light illuminates when the energy efficiency rating approaches the set value.

[0112] When the energy efficiency is lower than the set value, the green light will illuminate.

[0113] like Figure 5 As shown, Embodiment 2 of the present invention provides a method for energy efficiency testing of an AC-AC power transmission device, comprising the following steps:

[0114] SS1: The energy efficiency testing workbench is connected to the power supply and load device. The control board controls the circuit switching module to connect the energy efficiency testing circuit. Through sampling voltage transformers, sampling current transformers, sampling resistors, data acquisition modules, and signal digital-to-analog conversion modules, the amplitude and phase of the voltage and current in the energy efficiency testing circuit before the tested AC-AC power transmission device is connected are obtained. Specifically:

[0115] Connect the energy efficiency testing workbench to the power supply and load device;

[0116] The main control board controls the closure of circuit breaker QF01 and contactors KM03~KM04, and controls the closure of contactors KM01~KM02.

[0117] At this time, the AC-AC power transmission device under test was not connected to the energy efficiency detection circuit;

[0118] Voltage sampling units TV01 to TV06 convert high voltage to low voltage;

[0119] The current sampling units TA01 to TA06 convert large currents into small currents, and then convert the current signal into a voltage signal through the sampling resistor;

[0120] The data acquisition module collects voltage signals and transmits them to the signal-to-analog converter module, which then converts the signals from analog to digital to obtain the sampled voltage values.

[0121] The digital-to-analog converter module transmits the sampled voltage value to the main control board. The main control board measures and calculates the sampled voltage value to obtain the amplitude and phase of the voltage and current of the energy efficiency detection circuit before the AC-AC power transmission device under test is connected.

[0122] SS2: Connect the input and output terminals of the AC-AC power transfer device under test to the input and output terminals of the energy efficiency testing workbench, respectively. The main control board controls the circuit switching module to connect the AC-AC power transfer device under test to the energy efficiency testing circuit, which is in a loaded state. The amplitude and phase of the voltage and current at the input and output terminals of the AC-AC power transfer device under test in the loaded state are obtained through the sampling voltage transformer, sampling current transformer, sampling resistor, data acquisition module, and signal digital-to-analog conversion module. Specifically:

[0123] The input and output terminals of the AC-AC power transmission device under test are connected to the wiring terminals of the energy efficiency testing workbench. The main control board controls the contactors KM01 to KM02 to disconnect. At this time, the AC-AC power transmission device under test is connected to the energy efficiency testing circuit and is in a loaded state. The voltage and current signals of the input and output sides of the AC-AC power transmission device under test are collected by the voltage sampling units TV01 to TV06 and the sampling current transformer. After digital-to-analog conversion, the signals are transmitted to the main control board, and the amplitude and phase of the voltage and current at the input and output terminals of the AC-AC power transmission device under test are calculated.

[0124] SS3: The main control board calculates the load energy efficiency detection characteristic quantities based on the amplitude and phase of the voltage and current at the input and output terminals of the AC-AC power transmission device under load conditions after connection; specifically:

[0125] The main control board compares and calculates the input active power, input reactive power, input power factor, output active power, output reactive power, output power factor, energy saving rate, and energy conversion efficiency of the tested AC-AC power transmission device by comparing the input characteristic quantities and output parameters.

[0126] ① Power calculation:

[0127] When contactors KM01~KM02 are closed, the voltage U1 and current I1 of the three-phase circuit A\B\C are tested when the AC-AC power transmission device under test is not connected, and the included angle is φ1.

[0128] The main control board calculates the total three-phase input active power (W) of the power supply when the tested AC-AC power transmission device is not connected. 11 =U 1*I1cosφ1; Total reactive power of three-phase input W 12 =U 1* I1sinφ1;

[0129] Control contactors KM01~KM02 are disconnected, allowing the AC-AC power transmission device under test to be connected to the operating circuit. Measure the input voltage U2 and current I2 of the AC-AC power transmission device under test, with an angle of φ2, and the output voltage U3 and current I3, with an angle of φ3.

[0130] The main control board calculates the total three-phase input active power (W) of the power supply when connected to the AC-AC power transmission device under test. 21 =U 2* I²cosφ²; Total reactive power of three-phase input W 22 =U 2* I2sinφ2;

[0131] The main control board calculates the total three-phase output active power (W) of the power supply when connected to the AC-AC power transmission device under test. 31 =U 3* I3cosφ3; Total reactive power of three-phase output W 32 =U 3* I3sinφ3;

[0132] ② Power factor calculation:

[0133] The main control board calculates the input power factor of the AC-AC power transmission device under test as W. 21 / (W 21 +W 22 );

[0134] The main control board calculates the output power factor of the tested AC-AC power transmission device as W. 31 / (W 31 +W 32 );

[0135] ③ Calculation of energy saving rate:

[0136] If the AC-AC power transmission device under test is a power-saving device, the power saving rate is calculated through the main control board.

[0137] =(W 11 -W 21 ) / W 11 ;

[0138] ④ Calculation of energy conversion efficiency:

[0139] The energy conversion efficiency is calculated using the main control board = W. 31 / W 21 ;

[0140] SS4: The main control board controls the circuit switching module to connect the tested AC-AC power transmission device to the energy efficiency detection circuit, ensuring it is in an unloaded state. Through sampling voltage transformers, sampling current transformers, sampling resistors, data acquisition modules, and signal digital-to-analog conversion modules, the amplitude and phase of the input and output voltages and currents of the tested AC-AC power transmission device in the unloaded state are obtained. The main control board then measures and calculates these values ​​to obtain the unloaded energy efficiency detection characteristic quantities. Specifically:

[0141] The main control board controls contactors KM03-KM04 to disconnect, at which point the AC-AC power transfer device under test is in an unloaded state. SS2 is repeated to calculate parameters such as the RMS values ​​of voltage and current, power factor, active power, reactive power, and energy conversion efficiency at the input and output terminals of the AC-AC power transfer device under unloaded conditions. The RMS values ​​of voltage and current at the input and output terminals are directly obtained through sampling voltage transformers and sampling current transformers.

[0142] SS5: The remote control terminal generates a test report based on the energy efficiency detection characteristics of the AC-AC power transmission device before and after connection. Specifically:

[0143] The main control board transmits the calculation results to the remote control terminal. The remote control host in the remote control terminal stores the information and parameters of the AC-AC power transmission device under test and generates a test report, i.e., an energy efficiency analysis report.

[0144] SS6: Print the test report, including information about the tested AC-AC power transmission device, energy efficiency results, measured operating parameters, and waveforms.

[0145] A terminal includes a processor and a storage medium; the storage medium is used to store instructions.

[0146] The processor is configured to operate according to the instructions to execute the steps of the method.

[0147] A computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the steps of the method.

[0148] The beneficial effects of this invention are as follows: Compared with the prior art, by integrating the sampling module, digital-to-analog conversion module, and control module into an energy efficiency testing workbench, the comprehensive energy efficiency test and other operating electrical parameter tests of alternating current power transmission devices can be completed through simple wiring. This is convenient to use, saves manpower and resources, ensures the safety of test personnel, and improves test efficiency and accuracy. By conducting comprehensive energy efficiency tests and other operating electrical parameter tests on alternating current power transmission devices such as energy-saving devices, transformers, and AC charging piles, the energy management and service capabilities of power grid companies at all levels can be further enhanced, promoting the advancement of energy-saving technologies, improving the energy efficiency of devices such as AC charging piles, and increasing energy utilization.

[0149] This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of this disclosure.

[0150] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination of the foregoing. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0151] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0152] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0153] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A system for energy efficiency testing of AC-AC power transmission devices, comprising an energy efficiency testing workbench and a remote control terminal, characterized in that: The energy efficiency testing workbench includes input terminals and output terminals, and integrates an energy efficiency testing circuit. The energy efficiency testing circuit includes a sampling voltage transformer, a sampling current transformer, a sampling resistor, a data acquisition module, a signal digital-to-analog conversion module, a main control board, and a line switching module. The input and output terminals are used to connect the input and output terminals of the AC-AC power transmission device under test; the sampling voltage transformer is connected in parallel with the input and output terminals and is also connected to the data acquisition module; the sampling current transformer is connected in series with the input and output terminals and is also connected to the data acquisition module through a sampling resistor. The sampling voltage transformer includes three input voltage sampling units TV01~TV03 and three output voltage sampling units TV04~TV06. TV01's primary winding has one end connected to the A-phase line of the input terminal of the AC-AC power transmission device under test, and the other end connected to the B-phase line and neutral line of the input terminal of the AC-AC power transmission device under test via the upper and lower terminals of contactor KM05. TV02's primary winding has one end connected to the B-phase line of the input terminal of the AC-AC power transmission device under test, and the other end connected to the C-phase line and neutral line of the input terminal of the AC-AC power transmission device under test via the upper and lower terminals of contactor KM05. TV03's primary winding has one end connected to the AC-AC power transmission device under test... The C-phase line of the input terminal of the device is connected to the A-phase line and neutral line of the input terminal of the AC-AC power transmission device under test through the upper and lower rows of terminals of contactor KM05. When the AC-AC power transmission device under test is powered by three-phase three-wire, the upper row of terminals of KM05 is turned on and the lower row of terminals is turned off, and TV01, TV02, and TV03 measure the line voltage between the AB, BC, and AC phase lines. When the device under test is powered by three-phase four-wire, the upper row of terminals of KM05 is turned off and the lower row of terminals is turned on, and TV01, TV02, and TV03 measure the AN, BN, and CN phase voltages. One end of the primary winding of TV04 is connected to the A-phase line of the output terminal of the AC-AC power transmission device under test, and the other end is connected through contactor KM05. The upper and lower terminals of contactor KM06 are connected to the B-phase and neutral lines of the output terminal of the AC-AC power transmission device under test; one end of the primary winding of TV05 is connected to the B-phase line of the output terminal of the AC-AC power transmission device under test, and the other end is connected to the C-phase and neutral lines of the output terminal of the AC-AC power transmission device under test through the upper and lower terminals of contactor KM06; one end of the primary winding of TV06 is connected to the C-phase line of the output terminal of the AC-AC power transmission device under test, and the other end is connected to the A-phase and neutral lines of the output terminal of the AC-AC power transmission device under test through the upper and lower terminals of contactor KM06; when the AC-AC power transmission device under test is powered by three-phase three-wire, the upper terminal of KM06 is closed, and the lower terminal is closed. When the terminals are disconnected, TV04, TV05, and TV06 measure the line voltage between phases AB, BC, and AC. When the test object is a three-phase four-wire power supply, the upper row of terminals of KM06 is disconnected, and the lower row of terminals is connected. TV04, TV05, and TV06 measure the phase voltages AN, BN, and CN. The sampling current transformer includes three input current sampling units TA01~TA03 and three output current sampling units TA04~TA06. Among them, TA01~TA03 are connected in series on the A, B, and C lines of the input terminal of the AC-AC power transmission device under test; TA04~TA06 are connected in series on the A, B, and C lines of the output terminal of the AC-AC power transmission device under test. The main control board is connected to the data acquisition module through the signal digital-to-analog conversion module to obtain the sampling voltage transformer and sampling current transformer data collected by the data acquisition module and calculate the energy efficiency detection characteristic quantity accordingly. The main control board is also connected to the line switching module. The main control board controls the line switching module to switch the voltage transformer sampling mode according to the input voltage wiring method of the AC-AC power transmission device under test, in order to perform load and no-load energy efficiency detection and control. The line switching module includes circuit breaker QF01 and AC contactors KM01~KM04. Circuit breaker QF01 is connected in series between TA01~TA03 and TV01~TV03, AC contactors KM03~KM04 are connected in series between TA04~TA06 and TV04~TV06, and AC contactors KM01~KM02 are connected in series with... Circuit breaker QF01 is connected in series between TA01~TA03 and AC contactors KM03~KM04. During energy efficiency testing, circuit breaker QF01 is in the closed state. Contactors KM01~KM04 are controlled to close or open by the main control board according to the load or no-load energy efficiency test items. When contactors KM01~KM02 are open and KM03~KM04 are closed, the AC-AC power transmission device under test is in the loaded state. When contactors KM03~KM04 are open and KM01~KM02 are closed, the AC-AC power transmission device under test is in the no-load state. The remote control terminal is connected to the main control board and is used to generate a test report based on the energy efficiency detection characteristics obtained from the main control board.

2. The system for energy efficiency detection of AC-AC power transmission devices according to claim 1, characterized in that: The input terminals include three-phase input terminals XTA1, XTB1, and XTC1; The output terminals include three-phase output terminals XTA2, XTB2, and XTC2; When performing energy efficiency testing, the input terminal of the AC-AC power transmission device under test is connected to the three-phase input terminals XTA1, XTB1, XTC1 and the grounding terminal XTN1, and the output terminal of the AC-AC power transmission device under test is connected to the three-phase output terminals XTA2, XTB2, XTC2 and the grounding terminal XTN2.

3. The system for energy efficiency detection of AC-AC power transmission devices according to claim 1, characterized in that: The voltage sampling unit is connected to the data acquisition module; The current sampling unit is connected to the data acquisition module after being connected to the sampling resistor; The data acquisition module is connected to the signal digital-to-analog conversion module. It obtains the sampled voltage value through analog-to-digital conversion and transmits the sampled voltage value to the main control board connected to the signal digital-to-analog conversion module. The main control board measures and calculates the sampled voltage value to obtain the energy efficiency detection characteristic quantity and transmits it to the remote control terminal.

4. The system for energy efficiency detection of AC-AC power transmission devices according to claim 1, characterized in that: The remote control terminal includes a remote control host, which includes a data management module, a system settings module, and other functional modules. The data management module is used for data management of the AC-AC power transmission device under test. The system settings module is used to set communication parameters, printing error limits, energy conversion efficiency limits, default power saving test time, default load power, load range percentage, and report generation information. The other functional modules are used for data extraction, report printing, data backup and recovery.

5. The system for energy efficiency detection of an AC-AC power transmission device according to claim 1, characterized in that: The energy efficiency testing workbench is also equipped with red, green and yellow warning lights on its surface; The alarm light is connected to the main control board; A red light illuminates when energy efficiency exceeds the set value. The yellow light illuminates when the energy efficiency is at the set value. When the energy efficiency is lower than the set value, the green light will illuminate.

6. A method for energy efficiency testing of an AC-AC power transmission device, implemented based on the system for energy efficiency testing of an AC-AC power transmission device as described in any one of claims 1-5, characterized in that: The method includes the following steps: SS1: The energy efficiency testing workbench is connected to the power supply and load device. The control board controls the circuit switching module to connect the energy efficiency testing circuit. The voltage and current amplitude and phase of the energy efficiency testing circuit before the AC-AC power transmission device under test are connected are obtained through the sampling voltage transformer, sampling current transformer, sampling resistor, data acquisition module, and signal digital-to-analog conversion module. SS2: Connect the input and output terminals of the AC-AC power transmission device under test to the input and output terminals of the energy efficiency testing workbench, respectively. The main control board controls the circuit switching module to connect the AC-AC power transmission device under test to the energy efficiency testing circuit and to the load state. The amplitude and phase of the voltage and current at the input and output terminals of the AC-AC power transmission device under test under load state are obtained through the sampling voltage transformer, sampling current transformer, sampling resistor, data acquisition module, and signal digital-to-analog conversion module. SS3: The main control board calculates the load energy efficiency detection characteristic quantity based on the amplitude and phase of the voltage and current at the input and output terminals of the AC-AC power transmission device under load conditions after it is connected to the test. SS4: The main control board controls the circuit switching module to connect the AC-AC power transmission device under test to the energy efficiency detection circuit, and it is in an unloaded state. The sampling voltage transformer, sampling current transformer, sampling resistor, data acquisition module, and signal digital-to-analog conversion module obtain the amplitude and phase of the voltage and current at the input and output terminals of the AC-AC power transmission device under test in the unloaded state after connection. The main control board measures and calculates them to obtain the unloaded energy efficiency detection characteristic quantity. SS5: The remote control terminal generates a test report based on the energy efficiency detection characteristics of the AC-AC power transmission device before and after connection.

7. A method for energy efficiency testing of an AC-AC power transmission device according to claim 6, characterized in that: Both the load energy efficiency detection characteristic and the no-load energy efficiency detection characteristic include the effective values ​​of voltage and current, power factor, active power, reactive power, and energy conversion efficiency at the input and output terminals of the AC-AC power transmission device under test. The effective values ​​of voltage and current at the input and output terminals are directly obtained through sampling voltage transformers and sampling current transformers.

8. A method for energy efficiency testing of an AC-AC power transmission device according to claim 7, characterized in that: The specific calculation methods for each energy efficiency detection characteristic quantity of the test subject under no-load or load conditions are as follows: The total active power (W) of the three-phase input of the power supply when the AC-AC power transmission device under test is not connected. 11 =U 1* I1cosφ1; The total reactive power of the three-phase input is W. 12 =U 1* I1sinφ1; Wherein, U1 and I1 are the voltages and currents of the three-phase circuits A, B, and C when the AC-AC power transmission device under test is not connected, and the included angle is φ1; When the AC-AC power transmission device under test is connected, the total active power of the three-phase input of the power supply is W. 21 =U 2* I²cosφ²; Total reactive power of three-phase input is W 22 =U 2* I2sinφ2; When the AC-AC power transmission device under test is connected, the total active power output of the three phases of the power supply is W. 31 =U 3* I3cosφ3; The total reactive power of the three-phase output is W. 32 =U 3* I3sinφ3; Among them, U2 and I2 are the input voltage and current of the AC-AC power transmission device under test when it is connected to the energy efficiency detection circuit, and the included angle is φ2. U3 and I3 are the voltage and current on the output side of the AC-AC power transmission device under test when it is connected to the energy efficiency detection circuit, and the included angle is φ3. The input power factor of the AC-AC power transmission device under test = W 21 / (W) 21 +W 22 ) The output power factor of the AC-AC power transmission device under test = W 31 / (W) 31 +W 32 ) Energy saving rate = (W) 11 -W 21 ) / W 11 ; Energy conversion efficiency calculation: Energy conversion efficiency = W 31 / W 21 .

9. A terminal, comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to perform the steps of the method according to any one of claims 6-8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements the steps of the method according to any one of claims 6-8.

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