CN210923901U - Valve unit aging device - Google Patents
Valve unit aging device Download PDFInfo
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- CN210923901U CN210923901U CN201921206397.4U CN201921206397U CN210923901U CN 210923901 U CN210923901 U CN 210923901U CN 201921206397 U CN201921206397 U CN 201921206397U CN 210923901 U CN210923901 U CN 210923901U
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Abstract
A valve unit aging device is used for aging a first valve unit and a second valve unit and comprises a voltage regulator, a phase-shifting transformer, a load reactor and a main control unit; the phase-shifting transformer adopts a multi-secondary side phase-shifting transformer; the input end of the voltage regulator is electrically connected with an external power supply, and the output end of the voltage regulator is electrically connected with the primary side of the multi-secondary-side phase-shifting transformer; each group of secondary sides of the multi-secondary side phase-shifting transformer is connected with a three-phase rectifier bridge; each group of three-phase rectifier bridges of the multi-secondary-side phase-shifting transformer are sequentially connected in series and then are connected in parallel with the first valve unit; the second valve unit is connected with the first valve unit in parallel; the load reactor is connected between the output end of the first valve unit and the output end of the second valve unit; the main control unit is used for controlling the operation of the device. The utility model has the advantages that the number of components is small, the aging effect is ensured, and the cost is reduced; the capacity and stress of each device can be obviously reduced through the voltage regulator, and a soft start link is omitted; the adoption of rectifier bridge, voltage-sharing capacitor, voltage-sharing resistor further improves stability.
Description
Technical Field
The utility model belongs to flexible direct current transmission field, concretely relates to valve unit aging device.
Background
The valve unit in the offshore flexible direct current transmission device needs to be subjected to long-time aging tests in various research and development stages, and whether the thermal stress and the electrical stress of the valve unit meet the design requirements and the system requirements is verified. At present, the internal circuit of the traditional valve unit aging device is complex, the overall loss is high, the energy consumption is high, the aging operation can be started only by a soft start link, and in addition, the electrical stress and the feed-in power grid harmonic of the traditional aging device are large, and the aging effect of the device can be influenced.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a simple structure, consume energy few, need not the valve unit aging device of soft link of opening.
The utility model provides a technical scheme that its technical problem adopted is:
a valve unit aging device is used for aging a first valve unit and a second valve unit and comprises a voltage regulator, a phase-shifting transformer, a load reactor and a main control unit; the phase-shifting transformer adopts a multi-secondary side phase-shifting transformer;
the input end of the voltage regulator is electrically connected with an external power supply, and the output end of the voltage regulator is electrically connected with the primary side of the multi-secondary-side phase-shifting transformer; each group of secondary sides of the multi-secondary side phase-shifting transformer is connected with a three-phase rectifier bridge; each group of three-phase rectifier bridges of the multi-secondary-side phase-shifting transformer are sequentially connected in series and then are connected in parallel with the first valve unit; the second valve unit is connected in parallel with the first valve unit; the load reactor is connected between the output end of the first valve unit and the output end of the second valve unit;
the main control unit is electrically connected with the first valve unit enabling end and the second valve unit enabling end; the main control unit is used for controlling the device to operate.
Preferably, the three-phase rectifier bridge is connected with a voltage-sharing capacitor and a voltage-sharing resistor in parallel.
Preferably, the external power supply and the voltage regulator are further connected with a fuse, a circuit breaker and a main contactor which are sequentially connected in series.
Further, the aging circuit also comprises a current sensor for detecting the size of the aging current.
Preferably, the pressure regulator adopts a manual pressure regulator or an automatic pressure regulator.
Preferably, the load reactor is a ferromagnetic reactor or an air-core reactor.
The utility model discloses beneficial effect of embodiment:
the adopted components are few, so that the aging effect is ensured, and the cost is reduced;
the capacity and the stress of each device can be obviously reduced through the voltage regulator, and meanwhile, the soft start link can be omitted due to the small capacity of the voltage regulator;
the rectifier bridge, the voltage-sharing capacitor and the voltage-sharing resistor are connected in parallel and in series, so that the function of the phase-shifting transformer is favorably exerted, the harmonic waves fed into a power grid are reduced, and the stability is further improved.
Drawings
The following description will further describe embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
A valve unit aging device is used for aging a first valve unit F1 and a second valve unit F2 and comprises a pressure regulator 100, a phase-shifting transformer 200, a load reactor 300 and a main control unit; the phase-shifting transformer 200 adopts a multi-secondary side phase-shifting transformer;
the input end of the voltage regulator 100 is electrically connected with an external power supply, and the output end of the voltage regulator is electrically connected with the primary side of the multi-secondary-side phase-shifting transformer; each group of secondary sides of the multi-secondary side phase-shifting transformer is connected with a three-phase rectifier bridge; each group of three-phase rectifier bridges of the multi-secondary-side phase-shifting transformer are sequentially connected in series and then are connected in parallel with the first valve unit; the second valve unit is connected with the first valve unit in parallel; the load reactor 300 is connected between the output terminal of the first valve unit and the output terminal of the second valve unit;
the main control unit is electrically connected with the first valve unit enabling end and the second valve unit enabling end; the main control unit is used for controlling the operation of the device.
Each three-phase rectifier bridge D is connected with a voltage-sharing capacitor C and a voltage-sharing resistor R in parallel;
in this embodiment, the three-phase rectifier bridge D may also be replaced by a combination of diodes, but the voltage-sharing measures among the diodes need to be added to achieve the desired effect;
in this embodiment, the phase shift function of the phase shift transformer 200 can be fully performed by connecting the rectifier bridge D, the voltage-sharing capacitor C, and the voltage-sharing resistor R in series after being connected in parallel, so as to reduce the harmonic fed by the load to the power grid.
A fuse, a circuit breaker and a main contactor which are sequentially connected in series are connected between the external power supply and the voltage regulator 100;
in this embodiment, the fuse FU is used to ensure that the fault circuit can be normally broken when serious faults such as various short circuits occur in the subsequent stage; the breaker Q is provided with an electric operating mechanism, can be timely broken when in overload or system fault, and can effectively play a role in protecting the aging device when being used in cooperation with the fuse FU; the main contactor KM is used to ensure the normal switching on and off of the working circuit of the aging device.
The current sensor is used for detecting the aging current, so that the working state of the device can be better fed back, and the reliability of the device is further improved;
in this embodiment, the current sensor is a hall current sensor.
The pressure regulator 100 adopts a manual pressure regulator or an automatic pressure regulator;
in this embodiment, the regulation rate of the voltage regulator 100 is controlled to increase the output voltage according to a certain voltage change rate, so that the soft start of the load capacitor can be achieved, and the current stress passing through the three-phase rectifier bridge D can be limited at the same time;
before the contactor KM is normally switched on, the voltage regulator 100 needs to be at the position where the output voltage is zero, and after the aging test is finished, the voltage regulator 100 needs to return to the position where the output voltage is zero from the working voltage point.
In this embodiment, the phase-shifting transformer 200 and the voltage regulator 100 both have a certain parasitic inductance, which can simplify or eliminate the filter design of the whole device.
In this embodiment, the load reactor 300 is a ferromagnetic reactor or an air core reactor.
The basic working principle of the embodiment is as follows: by adjusting the amplitude and phase of the ac voltage output by the first valve unit F1 and the second valve unit F2, the current variation of the load reactor 300 can be realized, and the current inevitably flows through the semiconductor devices and the capacitors inside the first valve unit F1 and the second valve unit F2, thereby achieving the purpose of current aging.
The following briefly describes the operation process of this embodiment:
A. startup process
Closing the breaker Q, electrifying the aging device, detecting whether the voltage output of the voltage regulator T1 is at a zero position by the main control unit, if not, adjusting the voltage regulator T1 to the zero position, if so, closing the contactor KM, then, starting to adjust the output voltage of the voltage regulator T1 at a certain rate, enabling the first valve unit F1 and the second valve unit F2 by the main control unit of the aging device after the output voltage of the voltage regulator T1 is increased to a target voltage, gradually adjusting the voltage amplitude and the phase angle by the output voltages of the first valve unit F1 and the second valve unit F2 at the moment, gradually increasing the current on the load reactor L, and after the current on the load reactor L reaches the target value, fixing the output voltages of the first valve unit F1 and the second valve unit F2, and continuously running for aging;
B. shutdown procedure
The first valve unit F1 and the second valve unit F2 gradually reduce the amplitude of output voltage and adjust a phase angle, so that the current on the load reactor L is gradually reduced to zero, then the output voltage of the voltage regulator T1 is gradually adjusted to zero, finally the contactor KM is switched off, the breaker Q is switched off, and the shutdown process is completed;
the embodiment can also be additionally provided with a cooling system for cooling the aging device, so that a more stable and longer cooling effect is achieved.
The above is only the preferred embodiment of the present invention, the present invention is not limited to the above embodiment, and the technical solution of the present invention is all within the protection scope of the present invention as long as the present invention is realized by the substantially same means.
Claims (6)
1. A valve unit aging device is used for aging a first valve unit and a second valve unit, and is characterized in that: the system comprises a voltage regulator (100), a phase-shifting transformer (200), a load reactor (300) and a main control unit; the phase-shifting transformer (200) adopts a multi-secondary side phase-shifting transformer;
the input end of the voltage regulator (100) is electrically connected with an external power supply, and the output end of the voltage regulator is electrically connected with the primary side of the multi-secondary-side phase-shifting transformer; each group of secondary sides of the multi-secondary side phase-shifting transformer is connected with a three-phase rectifier bridge; each group of three-phase rectifier bridges of the multi-secondary-side phase-shifting transformer are sequentially connected in series and then are connected in parallel with the first valve unit; the second valve unit is connected in parallel with the first valve unit; the load reactor (300) is connected between the output of the first valve unit and the output of the second valve unit;
the main control unit is electrically connected with the first valve unit enabling end and the second valve unit enabling end; the main control unit is used for controlling the device to operate.
2. A valve unit ageing device according to claim 1, characterised in that: the three-phase rectifier bridge is connected with a voltage-sharing capacitor and a voltage-sharing resistor in parallel.
3. A valve unit ageing device according to claim 1, characterised in that: the external power supply and the voltage regulator (100) are connected with a fuse, a circuit breaker and a main contactor which are connected in series in sequence.
4. A valve unit ageing device according to claim 1, characterised in that: the aging circuit also comprises a current sensor for detecting the size of the aging current.
5. A valve unit ageing device according to claim 1, characterised in that: the pressure regulator (100) adopts a manual pressure regulator or an automatic pressure regulator.
6. A valve unit ageing device according to claim 1, characterised in that: the load reactor (300) adopts a ferromagnetic reactor or an air reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921206397.4U CN210923901U (en) | 2019-07-29 | 2019-07-29 | Valve unit aging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921206397.4U CN210923901U (en) | 2019-07-29 | 2019-07-29 | Valve unit aging device |
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| Publication Number | Publication Date |
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| CN210923901U true CN210923901U (en) | 2020-07-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921206397.4U Active CN210923901U (en) | 2019-07-29 | 2019-07-29 | Valve unit aging device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114217217A (en) * | 2021-12-15 | 2022-03-22 | 极氪汽车(宁波杭州湾新区)有限公司 | Switching dynamic characteristic test circuit and system of inverter |
-
2019
- 2019-07-29 CN CN201921206397.4U patent/CN210923901U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114217217A (en) * | 2021-12-15 | 2022-03-22 | 极氪汽车(宁波杭州湾新区)有限公司 | Switching dynamic characteristic test circuit and system of inverter |
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