UPS (Uninterrupted Power Supply) testing device

Abstract

The invention provides a UPS (Uninterrupted Power Supply) testing device. The UPS testing device comprises a load module and a control module, the load module comprises an adjustable nonlinear load unit and an adjustable linear load unit and is used for changing the waveform distortion degree of the output voltage of the UPS module to be tested; the adjustable nonlinear load unit and the adjustable linear load unit are connected in series and then are connected between the positive output end and the negative output end of the UPS module to be tested; the control module is used for obtaining the waveform distortion degree of the output voltage of the UPS module to be tested, and adjusting the control parameters of the UPS module to be tested when the waveform distortion degree is larger than a first preset threshold value, so that the waveform distortion degree of the output voltage of the UPS module to be tested is reduced to be below the first preset threshold value. According to the method, the waveform distortion degree of the output voltage of the UPS module can be tested through the load module, the control parameters of the UPS module are optimized based on the waveform distortion degree of the UPS module, automatic testing of the UPS module is achieved, and the debugging efficiency of the UPS module is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of UPS testing, and in particular to a UPS testing device. Background Art

[0002] UPS (Uninterruptible Power System) is a constant voltage and frequency uninterruptible power supply with an energy storage device and an inverter as its main component. It is mainly used to provide uninterrupted power supply to a single computer, computer network system or other power electronic equipment. When the mains input is normal, the UPS stabilizes the mains and supplies it to the load; when the mains power is interrupted, the UPS immediately uses the power of the battery in the machine to continue to supply 220V AC to the load through inverter conversion, so that the load can maintain normal operation. UPS is becoming more and more popular among users due to its uninterruptible power supply characteristics.

[0003] In order to ensure the product quality of UPS, UPS needs to be tested at full load before leaving the factory. During the test, the staff selects a load device to connect to the UPS output terminal and checks the waveform of the UPS output voltage to determine whether it is distorted. This method not only requires real-time selection of a suitable load device, but also requires manual verification of the test results. Not only is the test efficiency low, but the level of professionalism of the person will also affect the test results. Summary of the invention

[0004] The embodiment of the present invention provides a UPS testing device to solve the problem of low UPS testing efficiency.

[0005] In a first aspect, an embodiment of the present invention provides a UPS testing device, including: a load module and a control module;

[0006] The load module includes an adjustable nonlinear load unit and an adjustable linear load unit; the load module is used to change the waveform distortion of the output voltage of the UPS module to be tested;

[0007] The adjustable nonlinear load unit is connected in series with the adjustable linear load unit and then connected between the positive output terminal and the negative output terminal of the UPS module to be tested;

[0008] The control module is used to obtain the waveform distortion of the output voltage of the UPS module to be tested, and when the waveform distortion is greater than a first preset threshold, adjust the control parameters of the UPS module to be tested so that the waveform distortion of the output voltage of the UPS module to be tested is reduced to below the first preset threshold.

[0009] In a possible implementation, the adjustable nonlinear load unit includes an adjustable inductive load unit and an adjustable capacitive load unit; the adjustable linear load unit is an adjustable resistive load unit;

[0010] The first end of the adjustable inductive load unit is connected to the positive output end of the UPS module to be tested, the second end of the adjustable inductive load unit is connected to the first end of the adjustable capacitive load unit, the second end of the adjustable capacitive load unit is connected to the first end of the adjustable resistive load unit, and the second end of the adjustable resistive load unit is connected to the negative output end of the UPS module to be tested.

[0011] In a possible implementation, the adjustable inductive load unit includes a plurality of inductor sub-units and a first switch;

[0012] Each inductor subunit includes an inductor unit switch and an inductor;

[0013] The first ends of the first switch and each inductor unit switch are connected to the first end of the adjustable inductive load unit, the second ends of each inductor unit switch are connected to the first end of the corresponding inductor, and the second ends of each inductor and the second end of the first switch are connected to the second end of the adjustable inductive load unit.

[0014] In a possible implementation, the adjustable inductive load unit includes a first switch and a plurality of inductor sub-units;

[0015] Each inductor subunit includes an inductor and an inductor unit switch;

[0016] The first end of the first switch is connected to the first end of the adjustable inductive load unit, and the second end of the first switch is connected to the second end of the adjustable inductive load unit;

[0017] The first end of the inductor in the first inductor subunit is connected to the first end of the adjustable inductive load unit, the first end of the inductor in each inductor subunit except the first inductor subunit is connected to the second end of the inductor in the previous inductor subunit, the second end is connected to the first end of the corresponding inductor unit switch, and the second end of each inductor unit switch is connected to the second end of the adjustable inductive load unit.

[0018] In a possible implementation, the adjustable capacitive load unit includes a plurality of capacitor subunits and a second switch;

[0019] Each capacitor subunit includes a capacitor unit switch and a capacitor;

[0020] The first end of each capacitor unit switch and the second switch is connected to the first end of the adjustable capacitive load unit, the second end of each capacitor unit switch is connected to the first end of the corresponding capacitor, and the second end of each capacitor and the second end of the second switch are connected to the second end of the adjustable capacitive load unit.

[0021] In a possible implementation, the adjustable capacitive load unit includes a second switch and a plurality of capacitor subunits;

[0022] Each capacitor subunit includes a capacitor and a capacitor unit switch;

[0023] The first end of the second switch is connected to the first end of the adjustable capacitive load unit, and the second end of the second switch is connected to the second end of the adjustable capacitive load unit;

[0024] The first end of the capacitor in the first capacitor subunit is connected to the first end of the adjustable capacitive load unit, the first end of the capacitor in each capacitor subunit except the first capacitor subunit is connected to the second end of the capacitor in the previous capacitor subunit, the second end is connected to the first end of the corresponding capacitor unit switch, and the second end of each capacitor unit switch is connected to the second end of the adjustable capacitive load unit.

[0025] In a possible implementation, the adjustable resistive load unit includes a plurality of resistance sub-units;

[0026] Each resistor subunit includes a resistor unit switch and a resistor;

[0027] The first end of each resistance unit switch is connected to the first end of the adjustable resistive load unit, the second end of each resistance unit switch is connected to the first end of the corresponding resistor, and the second end of each resistor is connected to the second end of the adjustable resistive load unit.

[0028] In a possible implementation, the adjustable resistive load unit includes a plurality of resistance sub-units;

[0029] Each resistor subunit includes a resistor and a resistor unit switch;

[0030] The first end of the resistor in the first resistor subunit is connected to the first end of the adjustable resistive load unit, the first end of the resistor in each resistor subunit except the first resistor subunit is connected to the second end of the resistor in the previous resistor subunit, the second end is connected to the first end of the corresponding resistor unit switch, and the second end of each resistor unit switch is connected to the second end of the adjustable resistive load unit.

[0031] In a possible implementation, the UPS testing device further includes a power analyzer;

[0032] The power analyzer is used to obtain the waveform distortion of the output voltage of the UPS module to be tested, and send the waveform distortion to the control module.

[0033] In a possible implementation, the UPS testing device further includes a human-computer interaction module;

[0034] The control module is used to determine the demand value of the nonlinear load power based on the rated power of the UPS module to be tested, and send the demand value of the nonlinear load power to the human-computer interaction module;

[0035] The human-computer interaction module displays the required value of the nonlinear load power and obtains the inductive load power, capacitive load power and resistive load power input by the user;

[0036] The control module is used to adjust the inductance value of the adjustable inductive load unit according to the inductive load power; adjust the capacitance value of the adjustable capacitive load unit according to the capacitive load power, and adjust the resistance value of the adjustable resistive load unit according to the resistive load power.

[0037] The embodiment of the present invention provides a UPS test device, comprising: a load module and a control module; the load module comprises an adjustable nonlinear load unit and an adjustable linear load unit; the load module is used to change the waveform distortion of the output voltage of the UPS module to be tested; the adjustable nonlinear load unit is connected in series with the adjustable linear load unit and connected between the positive output terminal and the negative output terminal of the UPS module to be tested; the control module is used to obtain the waveform distortion of the output voltage of the UPS module to be tested, and when the waveform distortion is greater than a first preset threshold, adjust the control parameters of the UPS module to be tested so that the waveform distortion of the output voltage of the UPS module to be tested is reduced to below the first preset threshold. The above method can test the waveform distortion of the output voltage of the UPS module through the load module, and optimize the control parameters of the UPS module based on the waveform distortion of the UPS module, so as to realize the automatic test of the UPS module and improve the debugging efficiency of the UPS module. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0039] Figure 1 is a structural schematic diagram of a UPS testing device provided by an embodiment of the present invention;

[0040] Figure 2 Schematic diagram of the specific structure of the UPS test device provided by the embodiment of the present invention

[0041] Figure 3 is a specific circuit diagram of a UPS testing device provided by an embodiment of the present invention;

[0042] Figure 4 1 is another specific circuit diagram of the UPS testing device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0044] In order to make the purpose, technical solutions and advantages of the present invention more clear, specific embodiments will be described below in conjunction with the accompanying drawings.

[0045] Figure 1 The structure diagram of the UPS testing device provided by the embodiment of the present invention is shown in FIG. Figure 1 As shown, the UPS testing device includes a load module and a control module;

[0046] The load module includes an adjustable nonlinear load unit and an adjustable linear load unit; the load module is used to change the waveform distortion of the output voltage of the UPS module to be tested;

[0047] The adjustable nonlinear load unit is connected in series with the adjustable linear load unit and then connected between the positive output terminal and the negative output terminal of the UPS module to be tested;

[0048] The control module is used to obtain the waveform distortion of the output voltage of the UPS module to be tested, and when the waveform distortion is greater than a first preset threshold, adjust the control parameters of the UPS module to be tested so that the waveform distortion of the output voltage of the UPS module to be tested is reduced to below the first preset threshold.

[0049] In this embodiment, in order to ensure the quality of the power signal provided by the UPS module, it is necessary to test the waveform distortion of the output voltage of the UPS module. When the waveform distortion of the output voltage is greater than a first preset threshold, it indicates that the quality of the power signal output by the UPS module is poor and the control parameters inside the UPS module need to be adjusted.

[0050] Specifically, when the load connected to the output end of the UPS module is a linear load, its output voltage and output current waveforms are consistent and are sinusoidal waves; when the load connected to the output end of the UPS module is a nonlinear load, its output voltage will be distorted, the output voltage and output current waveforms will be inconsistent, and there will be a lead or lag, resulting in the output voltage waveform distortion exceeding the required value. Therefore, this embodiment can provide a load module containing an adjustable nonlinear load and an adjustable linear load to simulate a conventional load that will cause the output voltage of the UPS module to be distorted, test the UPS module, and adjust the control parameters of the UPS module based on the test results, so as to optimize the electrical signal output by the UPS module and ensure that the UPS module provides high-quality power signals for the actual load.

[0051] In this embodiment, the waveform distortion of the output voltage of the UPS module can be changed by adjusting the size of the adjustable nonlinear load unit and the adjustable linear load unit, and the waveform distortion of the output voltage of the UPS module can be reduced to below the first preset threshold by changing the control parameters of the UPS module. The adjustment process is described in detail as follows:

[0052] Step 1: Adjust the adjustable nonlinear load unit and the adjustable linear load unit to their respective corresponding initial load values;

[0053] Step 2: Using the current load module to test the UPS module, determine the waveform distortion of the output voltage, and reduce the waveform distortion of the output voltage to below a first preset threshold by adjusting the control parameters of the UPS module;

[0054] Step 3: Increase the load values ​​of the adjustable nonlinear load unit and the adjustable linear load unit, and return to step 2 to continue executing, and repeat steps 2-3 until the waveform distortion of the output voltage directly obtained when the UPS module is tested using the newly adjusted load module is below the first preset threshold, and the debugging of the UPS module is completed.

[0055] In a possible implementation, the UPS testing device further includes a power analyzer;

[0056] The power analyzer is used to obtain the waveform distortion of the output voltage of the UPS module to be tested, and send the waveform distortion to the control module.

[0057] In this embodiment, the power analyzer is communicatively connected to the control module for sending the waveform distortion to the control module. When the control module detects that the waveform distortion of the output voltage is greater than a first preset threshold, the PID parameters in the control loop of the UPS module can be adjusted, and the adjustment direction of the PID parameters can be updated according to the waveform distortion of the output voltage after adjusting the PID parameters until the waveform distortion drops below the first preset threshold.

[0058] Exemplarily, the first preset threshold may be 3% to 8%, and specifically may be 5%.

[0059] It can be seen from the above embodiments that the above method can test the waveform distortion of the output voltage of the UPS module through the load module, and optimize the control parameters of the UPS module based on the waveform distortion of the UPS, thereby realizing automated testing of the UPS module and improving the debugging efficiency of the UPS module.

[0060] In one possible implementation, Figure 2 As shown, the adjustable nonlinear load unit includes an adjustable inductive load unit and an adjustable capacitive load unit; the adjustable linear load unit is an adjustable resistive load unit;

[0061] The first end of the adjustable inductive load unit is connected to the positive output end of the UPS module to be tested, the second end of the adjustable inductive load unit is connected to the first end of the adjustable capacitive load unit, the second end of the adjustable capacitive load unit is connected to the first end of the adjustable resistive load unit, and the second end of the adjustable resistive load unit is connected to the negative output end of the UPS module to be tested.

[0062] In this embodiment, the adjustable nonlinear load unit may be an inductive load or a capacitive load. When the adjustable nonlinear load unit includes an adjustable inductive load unit and an adjustable capacitive load unit, the adjustable inductive load unit, the adjustable capacitive load unit and the adjustable resistive load unit are connected in series between the positive output terminal and the negative output terminal of the UPS module.

[0063] In one possible implementation, Figure 3 As shown, the adjustable inductive load unit includes a plurality of inductor sub-units and a first switch K1;

[0064] Each inductor subunit includes an inductor unit switch (KL1-KLN) and an inductor (L1-LN);

[0065] The first ends of the first switch K1 and each inductor unit switch (KL1~KLN) are connected to the first end of the adjustable inductive load unit, the second ends of each inductor unit switch (KL1~KLN) are connected to the first end of the corresponding inductor (L1~LN), and the second ends of each inductor (L1~LN) and the second end of the first switch K1 are connected to the second end of the adjustable inductive load unit.

[0066] In this embodiment, by closing different numbers of inductor unit switches, different numbers of inductors can be connected in parallel, thereby obtaining inductive loads with various inductance values.

[0067] Exemplarily, the inductor unit switches KL1 , KL2 , and KLN may be closed, and the inductor unit switch KL3 and the first switch K1 may be opened, so as to obtain an adjustable inductive load unit in which L1 , L2 , and LN are connected in parallel.

[0068] In one possible implementation, Figure 4 As shown, the adjustable inductive load unit includes a first switch K1 and a plurality of inductor sub-units;

[0069] Each inductor subunit includes an inductor (L1-LN) and an inductor unit switch (KL1-KLN);

[0070] The first end of the first switch is connected to the first end of the adjustable inductive load unit, and the second end of the first switch is connected to the second end of the adjustable inductive load unit;

[0071] The first end of the inductor in the first inductor subunit is connected to the first end of the adjustable inductive load unit, the first end of the inductor in each inductor subunit except the first inductor subunit is connected to the second end of the inductor in the previous inductor subunit, the second end is connected to the first end of the corresponding inductor unit switch, and the second end of each inductor unit switch is connected to the second end of the adjustable inductive load unit.

[0072] In this embodiment, by closing different inductor unit switches, different numbers of inductors can be connected in series, thereby obtaining inductive loads with various inductance values.

[0073] Specifically, when the inductor L1 is to be used as an inductive load alone, KL1 can be closed and K1, KL2, KL3 and KLN can be disconnected; when the inductors L1 and L2 are to be connected in series, KL2 can be closed and K1, KL1, KL3 and KLN can be disconnected. By closing the inductor unit switches at different positions, the number of inductors in series can be adjusted, thereby achieving the inductance value adjustment of the inductive load.

[0074] In one possible implementation, Figure 3 As shown, the adjustable capacitive load unit includes a plurality of capacitor subunits and a second switch K2;

[0075] Each capacitor subunit includes a capacitor unit switch (KC1-KCN) and a capacitor (C1-CN);

[0076] The first end of each capacitor unit switch (KC1~KCN) and the second switch K2 are connected to the first end of the adjustable capacitive load unit, the second end of each capacitor unit switch (KC1~KCN) is connected to the first end of the corresponding capacitor (C1~CN), and the second end of each capacitor (C1~CN) and the second end of the second switch K2 are connected to the second end of the adjustable capacitive load unit.

[0077] In this embodiment, by closing different numbers of capacitor unit switches, different numbers of capacitors can be connected in parallel, thereby obtaining capacitive loads with various capacitance values.

[0078] Exemplarily, the capacitor unit switches KC1, KC2 and KCN may be closed, and the inductor unit switch KC3 and the first switch K2 may be opened to obtain an adjustable capacitive load unit in which C1, C2 and CN are connected in parallel.

[0079] In one possible implementation, Figure 4 As shown, the adjustable capacitive load unit includes a second switch K2 and a plurality of capacitor subunits;

[0080] Each capacitor subunit includes a capacitor (C1-CN) and a capacitor unit switch (KC1-KCN);

[0081] A first end of the second switch K2 is connected to a first end of the adjustable capacitive load unit, and a second end of the second switch K2 is connected to a second end of the adjustable capacitive load unit;

[0082] The first end of the capacitor C1 in the first capacitor subunit is connected to the first end of the adjustable capacitive load unit, the first end of the capacitor (C2~CN) in each capacitor subunit except the first capacitor subunit is connected to the second end of the capacitor in the previous capacitor subunit, and the second end is connected to the first end of the corresponding capacitor unit switch (KC1~KCN), and the second end of each capacitor unit switch (KC1~KCN) is connected to the second end of the adjustable capacitive load unit.

[0083] In this embodiment, by closing different capacitor unit switches, different numbers of capacitors can be connected in series, thereby obtaining capacitive loads with various capacitances.

[0084] Specifically, when capacitor C1 is desired to be used as a capacitive load alone, KC1 can be closed and K2, KC2, KC3 and KCN can be disconnected; when capacitors C1 and C2 are desired to be connected in series, KC2 can be closed and K2, KC1, KC3 and KCN can be disconnected. By closing capacitor unit switches at different positions, the number of capacitors in series can be adjusted, thereby achieving capacitance adjustment of the capacitive load.

[0085] In one possible implementation, Figure 3 As shown, the adjustable resistive load unit includes a plurality of resistance sub-units;

[0086] Each resistor sub-unit includes a resistor unit switch (KR1-KRN) and a resistor (R1-RN);

[0087] The first end of each resistance unit switch (KR1~KRN) is connected to the first end of the adjustable resistive load unit, the second end of each resistance unit switch (KR1~KRN) is connected to the first end of the corresponding resistor (R1~RN), and the second end of each resistor (R1~RN) is connected to the second end of the adjustable resistive load unit.

[0088] In this embodiment, by closing different numbers of resistance unit switches, a corresponding number of resistors can be connected in parallel, thereby obtaining resistive loads with various resistance values.

[0089] Exemplarily, the resistance unit switches KR1, KR2 and KRN may be closed, and the resistance unit switch KR3 and the first switch K3 may be opened to obtain an adjustable resistive load unit in which R1, R2 and RN are connected in parallel.

[0090] In one possible implementation, Figure 4 As shown, the adjustable resistive load unit includes a plurality of resistance sub-units;

[0091] Each resistor subunit includes a resistor (R1-RN) and a resistor unit switch (KR1-KRN);

[0092] The first end of the resistor RN in the first resistor subunit is connected to the first end of the adjustable resistive load unit, the first end of the resistor in each resistor (R1~R3) unit except the first resistor subunit is connected to the second end of the resistor in the previous resistor subunit, the second end is connected to the first end of the corresponding resistor unit switch (KR1~KRN), and the second end of each resistor unit switch (KR1~KRN) is connected to the second end of the adjustable resistive load unit.

[0093] In this embodiment, by closing different resistance unit switches, different numbers of resistors can be connected in series, thereby obtaining resistive loads with various resistance values.

[0094] Specifically, when the resistor R1 is desired to be used alone as a resistive load, KR1 can be closed, and K3, KR2, KR3, and KRN can be disconnected; when the resistors R1 and R2 are desired to be connected in series, KR2 can be closed, and K3, KR1, KR3, and KRN can be disconnected. By closing the resistor unit switches at different positions, the number of resistors in series can be adjusted, thereby achieving resistance value adjustment of the resistive load.

[0095] In this embodiment, the UPS testing device provided in this embodiment includes Figure 3 and Figure 4In addition to the structure shown, other structures can also be obtained based on the structural combination of the above-mentioned adjustable inductive load unit, adjustable capacitive load unit and adjustable resistive load unit. For example, an adjustable inductive load unit connected in series and an adjustable capacitive load unit connected in parallel, and an adjustable resistive load unit connected in parallel are connected in series as a group between the positive and negative output terminals of the UPS module.

[0096] In a possible implementation, the UPS testing device further includes a human-computer interaction module;

[0097] The control module is used to determine the demand value of the nonlinear load power based on the rated power of the UPS module to be tested, and send the demand value of the nonlinear load power to the human-computer interaction module;

[0098] The human-computer interaction module displays the required value of the nonlinear load power and obtains the inductive load power, capacitive load power and resistive load power input by the user;

[0099] The control module is used to adjust the inductance value of the adjustable inductive load unit according to the inductive load power; adjust the capacitance value of the adjustable capacitive load unit according to the capacitive load power, and adjust the resistance value of the adjustable resistive load unit according to the resistive load power.

[0100] In this embodiment, the user can set the ratio of nonlinear load power to total load power according to the actual application scenario, and determine the required value of nonlinear load when testing the UPS module to be tested based on the rated power and the ratio. The ratio is the maximum ratio of nonlinear load power to total load power in the actual application scenario, so after debugging the UPS test module based on the load of the ratio, the output voltage distortion of the UPS module will meet the requirements in most scenarios.

[0101] Specifically, after determining the demand value of the nonlinear load, if the UPS test device is in manual mode at this time, the display interface of the human-computer interaction module can display the demand value of the nonlinear load, and the user can automatically set the inductive load power, capacitive load power and resistive load power according to the demand value of the nonlinear load. The control module adjusts each switch in the adjustable inductive load unit according to the inductive load power so that the inductance value of the adjustable inductive load unit meets the inductive load power demand; adjusts each switch of the adjustable capacitive load unit according to the capacitive load power so that the capacitance value of the adjustable capacitive load unit meets the capacitive load power demand; and adjusts each switch of the adjustable resistive load unit according to the resistive load power so that the resistance value of the adjustable resistive load unit meets the resistive load power demand.

[0102] If the UPS test device is in automatic mode, the control module can automatically allocate the inductive load power, the capacitive load power and the resistive load power according to the demand value of the nonlinear load power, and then control the switching state of each switch in the adjustable inductive load unit, the switching state of each switch of the adjustable capacitive load unit and the switching state of each switch of the adjustable resistive load unit, so as to ensure that the load module can meet the test requirements of the UPS module.

[0103] In this embodiment, the test result of the UPS module to be tested can also be displayed on the display screen of the human-computer interaction module. The test result includes data such as waveform distortion, output voltage waveform, output current waveform and output power factor.

[0104] It can be seen from the above embodiments that this embodiment can automatically adjust the load values ​​of the adjustable nonlinear load unit and the adjustable linear load unit by automatically calculating the required value of the nonlinear load power of each UPS module to be tested, thereby realizing automatic configuration of the load module and improving the testing efficiency of the UPS module.

[0105] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A UPS testing device, characterized in that: include: Load module and control module; The load module includes an adjustable nonlinear load unit and an adjustable linear load unit; the load module is used to change the waveform distortion of the output voltage of the UPS module to be tested; The adjustable nonlinear load unit is connected in series with the adjustable linear load unit and then connected between the positive output terminal and the negative output terminal of the UPS module to be tested; The control module is used to obtain the waveform distortion of the output voltage of the UPS module to be tested, and when the waveform distortion is greater than a first preset threshold, adjust the control parameters of the UPS module to be tested so that the waveform distortion of the output voltage of the UPS module to be tested is reduced to below the first preset threshold.

2. The UPS testing device according to claim 1, characterized in that: The adjustable nonlinear load unit includes an adjustable inductive load unit and an adjustable capacitive load unit; the adjustable linear load unit is an adjustable resistive load unit; The first end of the adjustable inductive load unit is connected to the positive output end of the UPS module to be tested, the second end of the adjustable inductive load unit is connected to the first end of the adjustable capacitive load unit, the second end of the adjustable capacitive load unit is connected to the first end of the adjustable resistive load unit, and the second end of the adjustable resistive load unit is connected to the negative output end of the UPS module to be tested.

3. The UPS testing device according to claim 2, characterized in that: The adjustable inductive load unit includes a plurality of inductor sub-units and a first switch; Each inductor subunit includes an inductor unit switch and an inductor; The first ends of the first switch and each inductor unit switch are connected to the first end of the adjustable inductive load unit, the second ends of each inductor unit switch are connected to the first end of the corresponding inductor, and the second ends of each inductor and the second end of the first switch are connected to the second end of the adjustable inductive load unit.

4. The UPS testing device according to claim 2, characterized in that: The adjustable inductive load unit includes a first switch and a plurality of inductor sub-units; Each inductor subunit includes an inductor and an inductor unit switch; The first end of the first switch is connected to the first end of the adjustable inductive load unit, and the second end of the first switch is connected to the second end of the adjustable inductive load unit; The first end of the inductor in the first inductor subunit is connected to the first end of the adjustable inductive load unit, the first end of the inductor in each inductor subunit except the first inductor subunit is connected to the second end of the inductor in the previous inductor subunit, the second end is connected to the first end of the corresponding inductor unit switch, and the second end of each inductor unit switch is connected to the second end of the adjustable inductive load unit.

5. The UPS testing device according to claim 2, characterized in that: The adjustable capacitive load unit includes a plurality of capacitor subunits and a second switch; Each capacitor subunit includes a capacitor unit switch and a capacitor; The first end of each capacitor unit switch and the second switch is connected to the first end of the adjustable capacitive load unit, the second end of each capacitor unit switch is connected to the first end of the corresponding capacitor, and the second end of each capacitor and the second end of the second switch are connected to the second end of the adjustable capacitive load unit.

6. The UPS testing device according to claim 2, characterized in that: The adjustable capacitive load unit includes a second switch and a plurality of capacitor subunits; Each capacitor subunit includes a capacitor and a capacitor unit switch; The first end of the second switch is connected to the first end of the adjustable capacitive load unit, and the second end of the second switch is connected to the second end of the adjustable capacitive load unit; The first end of the capacitor in the first capacitor subunit is connected to the first end of the adjustable capacitive load unit, the first end of the capacitor in each capacitor subunit except the first capacitor subunit is connected to the second end of the capacitor in the previous capacitor subunit, the second end is connected to the first end of the corresponding capacitor unit switch, and the second end of each capacitor unit switch is connected to the second end of the adjustable capacitive load unit.

7. The UPS testing device according to claim 2, characterized in that: The adjustable resistive load unit includes a plurality of resistance sub-units; Each resistor subunit includes a resistor unit switch and a resistor; The first end of each resistance unit switch is connected to the first end of the adjustable resistive load unit, the second end of each resistance unit switch is connected to the first end of the corresponding resistor, and the second end of each resistor is connected to the second end of the adjustable resistive load unit.

8. The UPS testing device according to claim 2, characterized in that: The adjustable resistive load unit includes a plurality of resistance sub-units; Each resistor subunit includes a resistor and a resistor unit switch; The first end of the resistor in the first resistor subunit is connected to the first end of the adjustable resistive load unit, the first end of the resistor in each resistor subunit except the first resistor subunit is connected to the second end of the resistor in the previous resistor subunit, the second end is connected to the first end of the corresponding resistor unit switch, and the second end of each resistor unit switch is connected to the second end of the adjustable resistive load unit.

9. The UPS testing device according to claim 1, characterized in that: The UPS testing device also includes a power analyzer; The power analyzer is used to obtain the waveform distortion of the output voltage of the UPS module to be tested, and send the waveform distortion to the control module.

10. The UPS testing device according to claim 2, characterized in that: The UPS testing device also includes a human-computer interaction module; The control module is used to determine the demand value of the non-linear load power based on the rated power of the UPS module to be tested, and send the demand value of the non-linear load power to the human-computer interaction module; The human-computer interaction module displays the required value of the nonlinear load power and obtains the inductive load power, capacitive load power and resistive load power input by the user; The control module is used to adjust the inductance value of the adjustable inductive load unit according to the inductive load power; adjust the capacitance value of the adjustable capacitive load unit according to the capacitive load power, and adjust the resistance value of the adjustable resistive load unit according to the resistive load power.

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