CN210803607U - Frequency converter feedback load equipment - Google Patents
Frequency converter feedback load equipment Download PDFInfo
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- CN210803607U CN210803607U CN201921172936.7U CN201921172936U CN210803607U CN 210803607 U CN210803607 U CN 210803607U CN 201921172936 U CN201921172936 U CN 201921172936U CN 210803607 U CN210803607 U CN 210803607U
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Abstract
A frequency converter feedback load device is used for aging test of a frequency converter and comprises a preprocessing unit, a full-wave rectification unit, a grid-connected inversion unit, a sampling unit, a main control unit, an input interface used for connecting the output end of the frequency converter and an output interface used for connecting a power grid; wherein: the input pole of the preprocessing unit is connected to the input interface, and the output current of the frequency converter is output to the input pole of the full-wave rectification unit after being preprocessed; the output pole of the full-wave rectification unit is connected to the input pole of the grid-connected inversion unit, the output pole of the grid-connected inversion unit is connected to the output interface, the sampling unit is connected to the output pole of the grid-connected inversion unit, and the grid-connected current and grid-connected voltage output by the grid-connected inversion unit are collected; the main control unit is respectively connected to the frequency converter and the grid-connected inversion unit, and outputs a signal for adjusting output power to the frequency converter and a signal for adjusting output current to the grid-connected inversion unit according to the grid-connected current and grid-connected voltage obtained by sampling of the sampling unit.
Description
Technical Field
The utility model relates to an electronic equipment field especially relates to a converter repayment load equipment.
Background
At present, feedback load aging equipment of a frequency converter generally controls the output current or power of the frequency converter by detecting the output pulse voltage of the frequency converter, so as to meet the aging requirement of the frequency converter. However, the output characteristics of the frequency converter are very complex, and the output pulse frequency of the frequency converter and the low frequency contained in the frequency converter change along with the change of the load, so that the detection difficulty is high.
In addition, the aging test of the existing frequency converter generally only supports alternating current input or direct current input, and lacks feedback load products capable of simultaneously supporting alternating current input and direct current input of the frequency converter, so that when selecting the feedback load products, several types of feedback load products are generally required to be selected simultaneously to meet the requirements, and when the high cost is achieved, additional manpower and cost are required to be invested in use and maintenance due to different devices.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a simple, the cost of circuit is lower, support the converter repayment load equipment of multiple repayment mode to the problem that above-mentioned converter repayment load equipment exists.
The utility model provides a technical scheme as follows:
the utility model provides a frequency converter feedback load equipment, which is used for the aging test of the frequency converter and comprises a preprocessing unit, a full-wave rectification unit, a grid-connected inversion unit, a sampling unit, a main control unit, an input interface used for connecting the output end of the frequency converter and an output interface used for connecting a power grid; wherein: the input pole of the preprocessing unit is connected to the input interface, and the output current of the frequency converter is output to the input pole of the full-wave rectification unit after being preprocessed; the output pole of the full-wave rectification unit is connected to the input pole of a grid-connected inversion unit, the output pole of the grid-connected inversion unit is connected to the output interface, the sampling unit is connected to the output pole of the grid-connected inversion unit, and the grid-connected current and grid-connected voltage output by the grid-connected inversion unit are sampled; the main control unit is respectively connected to the frequency converter and the grid-connected inversion unit, and outputs a signal for adjusting output power to the frequency converter and a signal for adjusting output current to the grid-connected inversion unit according to the grid-connected current and the grid-connected voltage obtained by sampling of the sampling unit.
In the frequency converter feedback load equipment of the utility model, the frequency converter feedback load equipment also comprises a human-computer interaction unit, and the given value of the output power and the given value of the output current of the frequency converter are obtained through the human-computer interaction unit; the main control unit is connected to the man-machine interaction unit and generates a signal for adjusting output power and a signal for adjusting output current according to the output power given value, the output current given value, the grid-connected current and the grid-connected voltage which are obtained by sampling of the sampling unit.
In the frequency converter feedback load device of the utility model, the preprocessing unit comprises a circuit breaker and a three-phase reactor connected with the rear pole of the circuit breaker; and the breaker is disconnected when the output current of the frequency converter exceeds a preset value.
In the frequency converter feedback load device of the utility model, the full wave rectification unit comprises a direct current capacitor, a contactor and a soft start resistor; the input pole of the direct current capacitor is connected with the rear pole of the three-phase reactor, and the high-frequency pulse voltage waveform input by the three-phase reactor is rectified into direct current voltage; and the contactor and the soft start resistor are connected in parallel and then connected in series between the three-phase reactor and the direct current capacitor.
In the above frequency converter feedback load device of the present invention, the grid-connected inverter unit includes a three-phase half-bridge inverter, a three-phase full-bridge inverter, or a three-phase three-level inverter; the positive and negative electrodes of the direct current capacitor are connected with the positive and negative electrodes of the input end of the grid-connected inversion unit, and the output electrode of the grid-connected inversion unit is connected to the output interface in a transformer isolation mode or a hanging mode.
The utility model discloses an among the converter repayment load equipment, the contravariant unit that is incorporated into the power networks with it surveys the inductance still to have concatenated filter capacitor and net between the output interface in proper order.
The utility model discloses an among the converter repayment load equipment, the contravariant unit that is incorporated into the power networks with it has still concatenated the thyristor between the output interface, the thyristor with the net surveys the back-end connection of inductance, and control the intercommunication of contravariant unit and electric wire netting that is incorporated into the power networks.
The utility model discloses an among the converter repayment load equipment, the full wave rectification unit is including not controlling full wave rectifier circuit.
The utility model discloses a converter repayment load equipment passes through preprocessing unit, full wave rectification unit, the contravariant unit that is incorporated into the power networks, sampling unit, main control unit, according to the current that is incorporated into the power networks and the voltage that is incorporated into the power networks of gathering in real time, the output and the output current of adjustment converter have satisfied converter aging testing's demand simply reliably, have overcome the difficult defect of converter output pulse voltage detection. Meanwhile, the equipment supports three-phase alternating current feedback, single-phase alternating current feedback and direct current feedback, and can meet the aging requirements of different loads of customers, so that the cost of the customers is reduced, and the utilization rate of the equipment is improved.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
FIG. 1 is a schematic diagram of functional units of an embodiment of a frequency converter feedback load device;
FIG. 2 is a circuit diagram of one embodiment of a frequency converter feedback load device;
fig. 3 shows a circuit diagram of a three-phase half-bridge inverter of grid-connected inverter unit embodiment 1;
fig. 4 shows a circuit diagram of a three-phase full-bridge inverter of grid-connected inverter unit embodiment 2;
fig. 5 shows a circuit diagram of three-phase three-level inversion of grid-connected inversion unit embodiment 3.
Detailed Description
In order to make the technical purpose, technical solution and technical effects of the present invention more clear so that those skilled in the art can understand and implement the present invention, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, it is a schematic diagram of a functional unit of an embodiment of the frequency converter feedback load device of the present invention. The frequency converter feedback load equipment comprises a preprocessing unit 3, a full-wave rectification unit 4, a grid-connected inversion unit 5, a sampling unit 7, a main control unit 8, an input interface 2 used for connecting the output end of the frequency converter and an output interface 6 used for connecting a power grid. Wherein, the input pole of the preprocessing unit 3 is connected to the input interface 2, and outputs the output current of the frequency converter 1 to the input pole of the full-wave rectification unit 4 after preprocessing; an output pole of the full-wave rectification unit 4 is connected to an input pole of a grid-connected inversion unit 5, an output pole of the grid-connected inversion unit 5 is connected to the output interface 6, the sampling unit 7 is connected to an output pole of the grid-connected inversion unit 5, and grid-connected current and grid-connected voltage output by the grid-connected inversion unit 5 are sampled; the main control unit 8 is respectively connected to the frequency converter 1 and the grid-connected inverter unit 5, and outputs a signal for adjusting output power to the frequency converter 1 and a signal for adjusting output current to the grid-connected inverter unit 5 according to the grid-connected current and grid-connected voltage obtained by sampling by the sampling unit 7.
In the above embodiment, the frequency converter feedback load device further includes a human-computer interaction unit, the human-computer interaction unit obtains a given output power value and a given output current value of the frequency converter 1, the main control unit 8 is connected to the human-computer interaction unit, and generates a signal for adjusting the output power according to the given output power value, the given output current value, the grid-connected current obtained by sampling by the sampling unit 7, and the grid-connected voltage, so as to adjust the given output power value, output the signal for adjusting the output current, perform closed-loop control, and adjust the given output current value.
According to the frequency converter feedback load equipment, the grid-connected voltage and the grid-connected current are collected in real time, and the output power and the output current of the frequency converter are adjusted by combining the full-wave rectification unit and the grid-connected inversion unit, so that the defect that the output pulse voltage of the frequency converter is difficult to detect is avoided, and the requirement of the frequency converter aging test is simply and reliably met.
Fig. 2 is a circuit diagram of an embodiment of the frequency converter feedback load device according to the present invention. The circuit comprises a preprocessing unit, a full-wave rectification unit, a grid-connected inversion unit, a sampling unit, a main control unit, an input interface used for connecting the output end of a frequency converter and an output interface used for connecting a power grid. The output end of the frequency converter is connected to the input interface firstly and then connected to the input pole of a breaker Q1 of the preprocessing unit, the rear pole of the breaker Q1 is connected to a three-phase reactor L1, and the breaker Q1 and the three-phase reactor L1 form the preprocessing unit. The breaker Q1 is opened when the output current of the frequency converter exceeds a preset value. Specifically, the output of the frequency converter is firstly connected to the input pole of a breaker Q1 with controllable opening and closing, the breaker Q1 supports both single-phase input and three-phase input, and the breaker Q1 has an overload and overcurrent protection function. The rear stage of the input breaker Q1 is connected with a three-phase reactor L1, and the three-phase reactor L1 mainly plays a role of current limiting and filtering, so that the input current of the frequency converter is presented as sine wave current and is convenient to control. Since the frequency converter outputs a high-frequency pulse voltage and also includes a sine wave voltage with a lower frequency, the input reactor L1 needs to satisfy both the high-frequency and low-frequency requirements.
In the above embodiment, the rear pole of the three-phase reactor L1 is connected to the input pole of the full-wave rectification unit, and the full-wave rectification unit comprises a direct-current capacitor DC-CAP and a soft start circuit formed by the contactor KM and the soft start resistor Rs. The input pole of the direct-current capacitor DC-CAP is connected with the rear pole of the three-phase reactor L1, and the contactor KM and the soft start resistor Rs are connected in parallel and then connected in series between the three-phase reactor L1 and the direct-current capacitor DC-CAP. The filtering of the direct current capacitor DC-CAP rectifies the waveform of the input high-frequency pulse voltage into direct current voltage, and the soft start circuit can prevent the impact of the output of the frequency converter on the direct current capacitor when the frequency converter is started. In addition, the full-wave rectification unit also comprises an uncontrolled full-wave rectification circuit which supports direct-current voltage input.
In the above embodiment, the positive electrode and the negative electrode of the DC capacitor DC-CAP are connected to the positive electrode and the negative electrode of the input end of the grid-connected inverter unit, and the output electrode of the grid-connected inverter unit is connected to the output interface in a transformer isolation manner or a hanging manner and then is connected to the power grid. The grid-connected inverter unit comprises a three-phase half-bridge inverter (shown in figure 3), a three-phase full-bridge inverter (shown in figure 4) or a three-phase three-level inverter (shown in figure 5). The inverter with different topological structures is adopted, the voltage ranges of alternating current input and direct current input can be adjusted, the circuit supports extremely wide alternating current input and direct current input voltage ranges, three-phase alternating current feedback, single-phase alternating current feedback and direct current feedback are supported, aging requirements of different loads of customers can be met, accordingly, the cost of the customers is reduced, and the utilization rate of equipment is improved.
In the above embodiment, a filter capacitor Cout and a network side inductor Lout are further sequentially connected in series between the grid-connected inverter unit and the output interface. The rear pole of the inverter is connected with the filter capacitor Cout, so that the inverter outputs pure sine waves. The network side inductor Lout is mainly used for inhibiting high-frequency ripples from flowing into a power grid and reducing harmonic content of grid-connected feedback current.
In the embodiment, a thyristor SCR1-3 is also connected in series between the grid-connected inverter unit and the output interface, and a thyristor SCR1-3 is connected at the rear stage of the grid-side inductor Lout and is used for controlling the communication between the inverter and the power grid and realizing the energy feedback to the power grid. And current transformers CT 3-5 are connected between the grid-connected inversion unit and the output interface in series, and the rear pole of the thyristor SCR1-3 is connected with the current transformers CT 3-5 and is mainly used for controlling feedback power of the grid-connected inversion unit and compensating inversion voltage.
In the above embodiment, the sampling unit is connected to an output electrode of the grid-connected inverter unit, the sampling unit collects the grid-connected current and the grid-connected voltage output by the grid-connected inverter unit, and outputs the collected grid-connected current and the collected grid-connected voltage to the main control unit respectively connected to the frequency converter and the grid-connected inverter unit, and the main control unit outputs a signal for adjusting output power to the frequency converter and a signal for adjusting output current to the grid-connected inverter unit according to the grid-connected current and the grid-connected voltage obtained by sampling by the sampling unit, so that the defect that the pulse voltage output by the frequency converter is difficult to detect is avoided, and the requirement of the aging test of the frequency converter is simply and.
In the above embodiment, the frequency converter feedback load device further includes a human-computer interaction unit, the human-computer interaction unit obtains a given value of output power and a given value of output current of the frequency converter, the main control unit is connected to the human-computer interaction unit, and generates a signal for adjusting the output power according to the given value of the output power, the given value of the output current, the grid-connected current obtained by sampling by the sampling unit, and the grid-connected voltage, so as to adjust the given value of the output power, output the signal for adjusting the output current, perform closed-loop control, and adjust the given value of the output current.
Compare with current converter repayment load technique, implement the utility model discloses a converter repayment load equipment, accessible real-time collection's the voltage of being incorporated into the power networks and the electric current that is incorporated into the power networks combine full wave rectification unit and the contravariant unit that is incorporated into the power networks, in time adjust the output and the output current of converter to avoid the difficult shortcoming of converter output pulse voltage detection, satisfied the demand of converter aging testing simple and reliable.
Furthermore, the utility model discloses a converter repayment load equipment does not need extra device through adopting direct current input and alternating current input sharing power return circuit, just can realize three-phase alternating current repayment, single-phase alternating current repayment and the multiple ageing load function of direct current repayment at same repayment load circuit with low costs, expands the range of application of product.
It should be understood that the above-described embodiments only represent embodiments of the present invention, and the description thereof is more specific and detailed, but not intended to limit the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (8)
1. A frequency converter feedback load device is used for aging test of a frequency converter and is characterized by comprising a preprocessing unit, a full-wave rectification unit, a grid-connected inversion unit, a sampling unit, a main control unit, an input interface used for connecting the output end of the frequency converter and an output interface used for connecting a power grid; wherein: the input pole of the preprocessing unit is connected to the input interface, and the output current of the frequency converter is output to the input pole of the full-wave rectification unit after being preprocessed; the output pole of the full-wave rectification unit is connected to the input pole of a grid-connected inversion unit, the output pole of the grid-connected inversion unit is connected to the output interface, the sampling unit is connected to the output pole of the grid-connected inversion unit, and the grid-connected current and grid-connected voltage output by the grid-connected inversion unit are sampled; the main control unit is respectively connected to the frequency converter and the grid-connected inversion unit, and outputs a signal for adjusting output power to the frequency converter and a signal for adjusting output current to the grid-connected inversion unit according to the grid-connected current and the grid-connected voltage obtained by sampling of the sampling unit.
2. The frequency converter feedback load device of claim 1, further comprising a human-computer interaction unit, wherein the human-computer interaction unit obtains a given value of output power and a given value of output current of the frequency converter; the main control unit is connected to the man-machine interaction unit and generates a signal for adjusting output power and a signal for adjusting output current according to the output power given value, the output current given value, the grid-connected current and the grid-connected voltage which are obtained by sampling of the sampling unit.
3. The frequency converter feedback load device of claim 1, wherein the pre-processing unit comprises a circuit breaker and a three-phase reactor connected to a back-pole of the circuit breaker; and the breaker is disconnected when the output current of the frequency converter exceeds a preset value.
4. The frequency converter feedback load device of claim 3, wherein the full-wave rectification unit comprises a DC capacitor, a contactor, and a soft-start resistor; the input pole of the direct current capacitor is connected with the rear pole of the three-phase reactor, and the high-frequency pulse voltage waveform input by the three-phase reactor is rectified into direct current voltage; and the contactor and the soft start resistor are connected in parallel and then connected in series between the three-phase reactor and the direct current capacitor.
5. The frequency converter feedback load device of claim 4, wherein the grid-connected inverter unit comprises a three-phase half-bridge inverter, a three-phase full-bridge inverter, or a three-phase three-level inverter; the positive and negative electrodes of the direct current capacitor are connected with the positive and negative electrodes of the input end of the grid-connected inversion unit, and the output electrode of the grid-connected inversion unit is connected to the output interface in a transformer isolation mode or a hanging mode.
6. The frequency converter feedback load device of claim 5, wherein a filter capacitor and a grid sensing inductor are further connected in series between the grid-connected inverter unit and the output interface.
7. The frequency converter feedback load device according to claim 6, wherein a thyristor is connected in series between the grid-connected inverter unit and the output interface, and the thyristor is connected to a subsequent stage of the grid-connected inductor and controls the connection between the grid-connected inverter unit and a power grid.
8. The frequency converter feedback load device of any of claims 1-7 wherein the full wave rectification unit comprises an uncontrolled full wave rectification circuit.
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|---|---|---|---|
| CN201921172936.7U CN210803607U (en) | 2019-07-24 | 2019-07-24 | Frequency converter feedback load equipment |
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| CN201921172936.7U CN210803607U (en) | 2019-07-24 | 2019-07-24 | Frequency converter feedback load equipment |
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| CN210803607U true CN210803607U (en) | 2020-06-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116106780A (en) * | 2023-04-13 | 2023-05-12 | 深圳市鼎泰佳创科技有限公司 | Aging control energy-saving module of frequency converter power supply |
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2019
- 2019-07-24 CN CN201921172936.7U patent/CN210803607U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116106780A (en) * | 2023-04-13 | 2023-05-12 | 深圳市鼎泰佳创科技有限公司 | Aging control energy-saving module of frequency converter power supply |
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