Generator set loading test system

Abstract

The utility model discloses a generator set loading test system. The system comprises a generator set, a feedback type electric energy recovery module, an isolation transformer, a low-voltage power grid, a data acquisition module, an upper computer module and a control module, the generator set, the feedback type electric energy recovery module, the isolation transformer and the low-voltage power grid are electrically connected in series; the data acquisition module is electrically connected with the low-voltage power grid; the data acquisition module is in communication connection with the upper computer module; the upper computer module is in communication connection with the control module; the control module is electrically connected with the feedback type electric energy recovery module. According to the scheme, the electric energy of the generator or the generator set is recycled while the loading test is completed, so that the electric energy is prevented from being consumed in a heating form.

Description

TECHNICAL FIELD

[0001] The embodiment of the utility model relates to a generator technical field, especially a kind of generator set loading test system. BACKGROUND

[0002] Before factory, generator or generator set will carry out a series of factory test, to ensure that the design performance and manufacturing quality of generator or generator set meet the standard. One of the important tests is loading test.

[0003] Loading test is carried out in the actual operation of generator or generator set, mainly to verify the performance of generator or generator set under different loads. How to carry out generator or generator set loading, the traditional method is to use dummy load system to carry out loading test. Although traditional dummy load system can meet the requirements of generator or generator set loading test, dummy load system is to consume the electric energy generated by generator or generator set in the form of heat, resulting in waste of electric energy. UTILITY MODEL CONTENT

[0004] The embodiment of the utility model provides a kind of generator set loading test system, to realize the electric energy of generator or generator set is recycled while completing loading test, avoid the consumption of electric energy in the form of heat.

[0005] The embodiment of the utility model provides a kind of generator set loading test system, characterized in that, including: generator set, feedback type electric energy recovery module, isolation transformer, low-voltage power grid, data acquisition module, host computer module and control module;

[0006] The generator set, the feedback type electric energy recovery module, the isolation transformer and the low-voltage power grid are electrically connected in series;The data acquisition module is electrically connected with the low-voltage power grid;The data acquisition module is connected with the host computer module in communication;The host computer module is connected with the control module in communication;The control module is connected with the feedback type electric energy recovery module in communication.

[0007] Optionally, the generator set loading test system further includes: dummy load module;The generator set is also electrically connected with the dummy load module;The data acquisition module is also electrically connected with the dummy load module.

[0008] Optionally, the generator set loading test system further includes: first switch cabinet;The generator set is electrically connected with the feedback type electric energy recovery module through the first switch cabinet.

[0009] Optionally, the generator set is also electrically connected with the dummy load module through the first switch cabinet.

[0010] Optionally, the generator set loading test system further comprises a second switch cabinet; the isolation transformer is electrically connected with the low-voltage power grid through the second switch cabinet.

[0011] Optionally, the feedback type electric energy recovery module comprises a first filter, a first active rectification unit, a support capacitor, a second active rectification unit and a second filter; an input end of the first filter is electrically connected with the generator set;

[0012] an output end of the first filter, the first active rectification unit, the support capacitor, the second active rectification unit and an input end of the second filter are sequentially and electrically connected in series; an output end of the second filter is electrically connected with the isolation transformer.

[0013] Optionally, the first active rectification unit comprises a first H-bridge circuit; the second active rectification unit comprises a second H-bridge circuit.

[0014] Optionally, the dummy load module comprises a contactor and an impedance unit; the contactor is electrically connected with the impedance unit and used for changing the size of the impedance unit.

[0015] Optionally, the impedance unit comprises any combination of an inductive unit, a resistive unit and a capacitive unit.

[0016] Optionally, the control module comprises a CMS module.

[0017] The utility model discloses a generator set, feedback type electric energy recovery module, isolation transformer and low-voltage power grid series connection electric connection, data acquisition module with low-voltage power grid is electrically connected, data acquisition module with host computer module communication connection, host computer module with control module communication connection, control module with feedback type electric energy recovery module communication connection, and this can satisfy the loading test function of generator set through feedback type electric energy recovery module in the loading test process of generator set, and simultaneously in the test process, data acquisition module will gather the electric energy data of low-voltage power grid and transmit to host computer module, and control module receives the command from host computer module and dispatches feedback type electric energy recovery module, thereby feedback type electric energy recovery module will all electric energy that generator set loads produces is fed back to low-voltage power grid through isolation transformer and is used again, avoids the electric energy in the loading test process in the prior art and is consumed in the form of heat.

[0018] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the utility model, and is not used to limit the scope of the utility model. Other features of the utility model will become easy to understand through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to make the technical scheme in the embodiments of the present application clearer, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor.

[0020] Figure 1 is a structural schematic diagram of a generator set loading test system provided by the embodiment of the present application;

[0021] Figure 2 is a structural schematic diagram of another generator set loading test system provided by the embodiment of the present application;

[0022] Figure 3 is a structural schematic diagram of another generator set loading test system provided by the embodiment of the present application;

[0023] Figure 4 is a specific structural schematic diagram of a generator set loading test system provided by the embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to make the technical scheme in the embodiments of the present application clearer, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor.

[0025] It should be noted that the terms "first", "second", and the like in the description, claims, and above drawings of the present application are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be exchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0026] Figure 1 is a structural schematic diagram of a generator set loading test system provided by the embodiment of the present application, such as Figure 1As shown, the generator set loading test system comprises: a generator set 10, a feedback electric energy recovery module 20, an isolation transformer 30, a low-voltage power grid 40, a data acquisition module 50, an upper computer module 60 and a control module 70.

[0027] The generator set 10, the feedback electric energy recovery module 20, the isolation transformer 30 and the low-voltage power grid 40 are electrically connected in series; the data acquisition module 50 is electrically connected with the low-voltage power grid 40; the data acquisition module 50 is communicatively connected with the upper computer module 60; the upper computer module 60 is communicatively connected with the control module 70; and the control module 70 is communicatively connected with the feedback electric energy recovery module 20.

[0028] The feedback electric energy recovery module 20 can be in the form of a combination of a rectifier and an inverter; the feedback electric energy recovery module 20 can recover the electric energy output by the generator set; the isolation transformer 30 can perform voltage conversion to better match the voltage on the low-voltage power grid 40 side; the low-voltage power grid 40 can include different motor power supply loads; the data acquisition module 50 can acquire the electric energy data of the low-voltage power grid 40 in real time; and the data acquisition module 50 can transmit the electric energy data to the upper computer module 60. The control module 70 receives commands from the upper computer module 60 to adjust the feedback electric energy recovery module 20. Specifically, the control module 70 can control the feedback electric energy recovery module 20 to start or end the electric energy output by the feedback electric energy recovery module 20 and control the rate at which the feedback electric energy recovery module 20 recovers the electric energy output by the generator set 10.

[0029] In the embodiment, during the loading test of the generator set, the feedback electric energy recovery module 20 can meet the loading test function of the generator set. The loading test function of the generator set can be the process of transient test, steady-state test and the like of the generator set. At the same time, during the test process, the data acquisition module 50 transmits the acquired electric energy data of the low-voltage power grid 40 to the upper computer module 60, and the control module 70 receives commands from the upper computer module 60 to adjust the feedback electric energy recovery module 20. Thus, the feedback electric energy recovery module 20 recovers all the electric energy generated by the generator set 10 during loading through the isolation transformer 30 and feeds back to the low-voltage power grid 40 for reuse, thereby avoiding the consumption of electric energy in the form of heat during the loading test in the prior art.

[0030] In addition, it should be noted that the isolation transformer 30 can also eliminate the interference of common-mode voltage on the low-voltage power grid 40 in the embodiment. The inverter in the feedback electric energy recovery module 20 works through the PWM pulse width modulation control technology, and the voltage output is a rectangular pulse. If the voltage is directly output to the low-voltage power grid 40, the output voltage acts on the motor load in the power grid, and there will be common-mode voltage at the neutral point of the motor three-phase winding, i.e., the size of the output zero sequence voltage is:

[0031] Vcm=(Vu+Vv+Vw) / 3

[0032] Wherein, Vcm is common mode voltage; Vu, Vv and Vw are output voltages, since the output voltage is rectangular pulse, Vu, Vv and Vw are asymmetric at any time, Vcm also can not be zero at any time. So in any voltage source PWM control, common mode voltage exists; the harm of common mode voltage: (1) will induce high amplitude shaft voltage on the motor shaft, and forms bearing current, makes the bearing of motor damaged in short term, shortens the service life of motor. (2) produces EMI, and high harmonic current forms harmonic voltage drop on the line impedance, produces active and reactive loss, influences power supply grid power quality, influences the normal operation of other electronic equipment on the power grid.

[0033] In order to suppress and eliminate the influence of common mode voltage on the equipment in low voltage power grid 40, an isolation transformer 30 is added between feedback type electric energy recovery module 20 and low voltage power grid 40, common mode voltage is transferred from low voltage power grid 40 to the primary winding of isolation transformer 30, and new zero line-ground is established through isolation transformer 30, so that the common mode interference in low voltage power grid 40 and the interference of other neutral lines are eliminated, isolation transformer 30 converts three-wire delta connection into four-wire Y system, and shielding is further exempted from high-frequency pulse interference and noise coupled in isolation transformer 30, at this time, isolation transformer 30 must be correctly and strictly properly grounded, otherwise, the common mode interference resistance will have no effect.

[0034] Optionally, on the basis of the above embodiment, the generator set loading test system is further refined and optimized, Figure 2 is a structural schematic diagram of a generator set loading test system provided by the embodiment of the utility model, as Figure 2 shown, the generator set loading test system further comprises: a dummy load module 80; the generator set 10 is further electrically connected with the dummy load module 80; and the data acquisition module 50 is further electrically connected with the dummy load module 80.

[0035] In other embodiments, the generator set loading test system further comprises a dummy load module 80, and the generator set 10 is electrically connected with the dummy load module 80, so that the generator set 10 can complete the loading test function of the generator set through the dummy load module 80; and the combination of the dummy load module 80 and the feedback type electric energy recovery module 20 can jointly meet the loading test of the generator set. Specifically, in the partial test process, the dummy load module 80 can cause the waste of part of the electric energy generated by the generator set 10 in the form of heat; the data acquisition module 50 can also collect the current electric energy data of the dummy load module 80 and send the data to the upper computer module 60, and the upper computer module 60 can determine the remaining electric energy of the generator set 10 according to the current electric energy data of the dummy load module 80 and send a command to the control module 70, so that the control module 70 receives the command from the upper computer module 60 to adjust the working of the feedback type electric energy recovery module 20, so that the feedback type electric energy recovery module 20 completes the remaining test function, and at the same time, the feedback type electric energy recovery module 20 recovers the remaining electric energy generated by the generator set 10 during loading through the isolation transformer 30 and feeds back the electric energy to the low-voltage power grid 40 for recycling, so as to avoid the complete waste of the electric energy generated during the test process of the dummy load module 40.

[0036] Optionally, Figure 3 is a structural schematic diagram of a generator set loading test system provided by the embodiment of the utility model, as Figure 3 indicated, the generator set loading test system further comprises: a first switch cabinet 90; and the generator set 10 is electrically connected with the feedback type electric energy recovery module 20 through the first switch cabinet 90. When the feedback type electric energy recovery module 20 fails, the first switch cabinet 90 can play a protection role.

[0037] Optionally, continuing to refer to Figure 3 , the generator set 10 is also electrically connected with the dummy load module 80 through the first switch cabinet 90. When the dummy load module 80 fails, the first switch cabinet 90 can play a protection role. In addition, the dummy load module 80 and the feedback type electric energy recovery module 20 can be switched to meet the loading test of the generator set in any mode.

[0038] Optionally, continuing to refer to Figure 3 , the generator set loading test system further comprises: a second switch cabinet 100; and the isolation transformer 30 is electrically connected with the low-voltage power grid 40 through the second switch cabinet 100. The second switch cabinet 100 can play a role in controlling whether the voltage conversion voltage of the isolation transformer 30 is output to the low-voltage power grid 40, so as to play a protection role.

[0039] Optionally, Figure 4is a specific structure schematic view of a generator set loading test system provided by the embodiment of the utility model, as Figure 4 As shown in the figure, the feedback type electric energy recovery module 20 comprises: a first filter 21, a first active rectifier unit 22, a support capacitor 23, a second active rectifier unit 24 and a second filter 25; the input end of the first filter 21 is electrically connected with the generator set 10; the output end of the first filter 21, the first active rectifier unit 22, the support capacitor 23, the second active rectifier unit 24 and the input end of the second filter 25 are electrically connected in series; the output end of the second filter 25 is electrically connected with an isolation transformer 30. Among them, the first filter 21 filters the alternating current energy output by the engine set 10; the first active rectifier unit 22 converts the alternating current energy filtered by the first filter 21 into direct current energy; the second active rectifier unit 24 converts the direct current energy after the support capacitor 23 into alternating current energy; the second filter 25 plays a role of filtering the alternating current energy output by the second active rectifier unit 24 again.

[0040] Optionally, continuing to refer to Figure 4 The first active rectifier unit 22 comprises a first H-bridge circuit 221; the second active rectifier unit 24 comprises a second H-bridge circuit 241. The first H-bridge circuit 221 comprises upper and lower bridge arm transistors, and the control module 70 can comprise a CMS module, which can control the on-off of the upper and lower bridge arm transistors of the first H-bridge circuit 221, thereby playing a role of rectification; the second H-bridge circuit 241 comprises upper and lower bridge arm transistors, and the CMS module can also control the on-off of the upper and lower bridge arm transistors of the second H-bridge circuit 241, thereby playing a role of inversion; the first filter 21 and the second filter 25 are both combinations of inductors.

[0041] Optionally, continuing to refer to Figure 4 The false load module 80 comprises: a contactor 81 and an impedance unit 82; the contactor 81 is electrically connected with the impedance unit 82, and the contactor 81 is used for changing the size of the impedance unit 82. Among them, the impedance unit 82 comprises any combination of an inductor unit, a resistor unit and a capacitor unit.

[0042] It should be noted that the above is only the preferred embodiment of the utility model and the technical principle applied. Those skilled in the art will understand that the utility model is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the protection scope of the utility model. Therefore, although the utility model has been described in more detail through the above embodiments, the utility model is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the utility model concept, and the scope of the utility model is determined by the appended claims.

Claims

1. A genset loading test system, characterized by, The application relates to a power generation and feedback type electric energy recovery system. The system comprises a generator set, a feedback type electric energy recovery module, an isolation transformer, a low-voltage power grid, a data acquisition module, an upper computer module and a control module. The generator set, the feedback type electric energy recovery module, the isolation transformer and the low-voltage power grid are electrically connected in series; the data acquisition module is electrically connected with the low-voltage power grid; the data acquisition module is communicatively connected with the upper computer module; the upper computer module is communicatively connected with the control module; and the control module is communicatively connected with the feedback type electric energy recovery module.

2. The genset loading test system of claim 1, wherein, The system further comprises a dummy load module; the generator set is further electrically connected with the dummy load module; and the data acquisition module is further electrically connected with the dummy load module. The system further comprises a first switch cabinet; the generator set is electrically connected with the feedback type electric energy recovery module through the first switch cabinet.

3. The genset loading test system of claim 2, wherein, The generator set is further electrically connected with the dummy load module through the first switch cabinet. The system further comprises a second switch cabinet.

4. The genset loading test system of claim 3, wherein, The isolation transformer is electrically connected with the low-voltage power grid through the second switch cabinet.

5. The genset loading test system of claim 1, wherein, The feedback type electric energy recovery module comprises a first filter, a first active rectification unit, a support capacitor, a second active rectification unit and a second filter; an input end of the first filter is electrically connected with the generator set; an output end of the first filter, the first active rectification unit, the support capacitor, the second active rectification unit and an input end of the second filter are sequentially and electrically connected in series; and an output end of the second filter is electrically connected with the isolation transformer. The first active rectification unit comprises a first H-bridge circuit; and the second active rectification unit comprises a second H-bridge circuit.

6. The genset loading test system of claim 1, wherein, The dummy load module comprises a contactor and an impedance unit; the contactor is electrically connected with the impedance unit and used for changing the size of the impedance unit. The impedance unit comprises any combination of an inductance unit, a resistance unit and a capacitance unit.

7. The genset loading test system of claim 6, wherein, The control module comprises a CMS module.

8. The genset loading test system of claim 2, wherein, ​ 9. The genset loading test system of claim 8, wherein, ​ 10. The genset loading test system of claim 1, wherein, ​

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