CN204649913U - Pipe testing circuit between a kind of chain type STATCOM change of current end of the chain - Google Patents
Pipe testing circuit between a kind of chain type STATCOM change of current end of the chain Download PDFInfo
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- CN204649913U CN204649913U CN201520357546.2U CN201520357546U CN204649913U CN 204649913 U CN204649913 U CN 204649913U CN 201520357546 U CN201520357546 U CN 201520357546U CN 204649913 U CN204649913 U CN 204649913U
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Abstract
The utility model provides pipe testing circuit between a kind of chain type STATCOM change of current end of the chain, comprises input control module, boost module, measuring and protecting module, tested module and charging module; After described input control module is connected with boost module, in parallel respectively with measurement module, tested module and charging module.Withstand voltage test between the change of current end of the chain is completed by hookup.The hookup that the utility model provides is simple, and convenient and reliable, provide the high-potting means of testing of change of current chain, demonstrate insulation characterisitic and the operation characteristic of change of current chain, the reliability service for STATCOM has laid solid foundation.
Description
Technical field
The utility model belongs to electric and electronic technical field, is specifically related to pipe testing circuit between a kind of chain type STATCOM change of current end of the chain.
Background technology
STATCOM (Static Synchronous Compensator, STATCOM), it is a kind of novel static Reactive Compensation Device, be made up of the voltage source converter of connecting system in parallel, its capacitive exported or perceptual reactive current continuous, adjustable and independent of the voltage with system tie point.It is with voltage source converter ((Voltage Source Converter, VSC) be core, DC side adopts direct current capacitors to be energy-storage travelling wave tube, turn-off device is utilized DC voltage to be converted to the alternating voltage with electrical network same frequency, and be connected in parallel on electrical network by linked reactor, suitably regulate amplitude and the phase place of AC output voltage, or directly control its ac-side current, device just can be made to absorb or send the reactive current met the demands, realize the object of dynamic passive compensation.The alternating-current voltage source of STATCOM one of can be regarded as that amplitude and phase place all can control equivalently and electrical network same frequency.The feature that this device has dynamic Continuous Var Compensation, governing speed is fast, range of adjustment is wide, under-voltage lower Reactive-power control ability is strong, harmonic content is little, low in energy consumption.
In order to form practical Large Copacity and satisfactory low harmony wave, STATCOM many employings chain type many level topological structure, every phase change of current chain is all an independently chain, be in series by the identical elementary cell of N number of structure, as shown in Figure 1, each elementary cell is by the high power device entirely controlled and interlock circuit thereof, triggering system, heating radiator and insulation system consist of certain connected mode, structure and control very complicated, again because the actual operating mode in electric system is also very complicated, therefore, high-power change of current chain is a very complicated electric component, in order to can long-term safety run reliably in systems in which, according to industry correlation test standard-required, high-potting test need be carried out to change of current chain, to check the dielectric strength of change of current chain, electrical specification and other operation characteristic.
STATCOM is an importance of Survey of Flexible AC Transmission System Technology, and chain structure is a kind of novel topological structure, is in series by the identical link units of N number of structure; The DC side of its link units is made up of direct current capacitors, and the power supply of link units can complete by circuit by being connected on getting of capacitor two ends, as shown in Figure 2.To cascade link units, ensure that the DC bus-bar voltage of each link units is balanced, each power semiconductor device of guarantee bears identical stress, thus ensures that each element is all in range of safety operation.
Because the element of link units can not be accomplished completely the same on hardware, parameter there are differences, so each segment parameters certainly exists some differences.For the STATCOM that DC bus gets energy, in start-up course, there is certain difference in the start-up time of draw-out power supply, starting power, institute's bringing onto load size, because the factor such as electrical specification and parameter inconsistency of DC capacitor can cause each chain link DC capacitor voltage unbalance, this is particularly evident during low pressure uncontrollable rectifier, when differing greatly, STATCOM can be caused normally not start, even cause DC bus capacitor superpotential, threaten equipment safety.
Utility model content
In order to solve the problems referred to above that chain type STATCOM test exists, the utility model provides pipe testing circuit between a kind of chain type STATCOM change of current end of the chain, this hookup is simple, test method is reliable, obtain good effect, solve between the Large Copacity change of current end of the chain and test a difficult problem, for STATCOM provides test basis.
To achieve these goals, the utility model takes following scheme:
The utility model provides pipe testing circuit between a kind of chain type STATCOM change of current end of the chain, and described change of current chain is composed in series by multiple link units; Described link units comprises DC bus support capacitor, draw-out power supply, entirely controls device, trigger circuit, pass devices, heating radiator and link units controller; Described hookup comprises input control module, boost module, measuring and protecting module, tested module and charging module; After described input control module is connected with boost module, in parallel respectively with measurement module, tested module and charging module.
Described input control module comprises the first power supply and the first switch cubicle;
First power supply is the AC power of 10KV and 10KV above, and its amount of capacity need meet the power of change of current chain between holding during withstand voltage test needed for the static normal work of each link units;
The electric pressure of the first switch cubicle is identical with the electric pressure of the first power supply, and its capacity and boost module match, and measuring and protecting module controls the first switch cubicle, to realize the protection to change of current chain.
Described boost module comprises pressure regulator, step-up transformer and current-limiting resistance;
The electric pressure of described pressure regulator meets the electric pressure of the first power supply, and its capacity and step-up transformer power match;
Voltage on the winding of former limit is raised by vice-side winding by described step-up transformer, its vice-side winding is made up of Multiple coil, Multiple coil adopts serial or parallel connection mode to connect output voltage for changing described step-up transformer and output current, with meet change of current chain held between the demand of withstand voltage test;
The output current of described current-limiting resistance to step-up transformer limits, and avoids step-up transformer to damage because of overload.
Described measuring and protecting module comprises the first current sensor for gathering pressure regulator output current, for gathering the second current sensor of step-up transformer output current, voltage sampling circuit, signal collection modulation circuit and control operation platform.
When described first current sensor is used for preventing pressure regulator from breaking down, the first power supply is protected;
When described second current sensor is used for preventing the change of current chain from occurring overcurrent fault, realize the protection to step-up transformer, pressure regulator and the first power supply;
Described voltage sampling circuit is used for, to the sampling of transformer output voltage by voltage after capacitor dividing potential drop, realizing the supervision to voltage between the change of current end of the chain and superpotential protection;
After described signal collection modulation circuit processes the output voltage of step-up transformer and output current, be uploaded to described control operation platform and complete the display of data and the collection of data.
Described tested module comprises change of current chain, the first isolating switch and the second isolating switch;
Described first isolating switch and the second isolating switch complete the switching between boost module and charging module, the electric pressure of code requirement when both to need to meet between the change of current end of the chain the highest trial voltage.
Described charging module comprises and softly opens resistance, second switch cabinet and second source;
Second source is charged to the DC bus support capacitor in each link units of change of current chain by the soft resistance that opens, and meets energy required when each draw-out power supply starts in each link units of change of current chain;
The electric pressure of second switch cabinet is identical with the electric pressure of second source, can carry out control and protection to second source.
Compared with prior art, the beneficial effects of the utility model are:
Between the chain type STATCOM change of current end of the chain that the utility model provides, pipe testing circuit is simple, convenient and reliable, there is provided the high-potting means of testing of change of current chain, demonstrate insulation characterisitic and the operation characteristic of change of current chain, the reliability service for STATCOM has laid solid foundation; And solving a withstand voltage test difficult problem between the high-power change of current end of the chain, the commercialization for large capacity STATCOM provides test foundation.
Accompanying drawing explanation
Fig. 1 is change of current chain chain link connection diagram in STATCOM;
Fig. 2 is chain link cellular construction schematic diagram in STATCOM;
Fig. 3 is pipe testing circuit structural drawing between the chain type STATCOM change of current end of the chain in the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
STATCOM change of current chain structure, composition and control are complicated, operating condition complexity in electric system is various, and can long-term safety reliability service, according to correlation standard, high-potting test must be carried out, to check insulating property and other operation characteristic of change of current chain to change of current chain.
Between the conventional chain type STATCOM change of current end of the chain in hookup, the exportable voltage of usual experiment power supply is higher and range of adjustment is wide, but power supply capacity is less, when tested change of current chain two ends apply test by pressure regulator and step-up transformer, voltage progressively raises from low to high, when chain link both end voltage is increased to draw-out power supply trigger voltage, power initiation is powered to control circuit.Power initiation power is larger, be put to the test the restriction of power supply capacity and test loop impedance, the impact of protection circuit, DC bus-bar voltage can be dragged down instantaneously in start-up course, and easily cause the startup repeatedly of power supply, in addition the start-up time of draw-out power supply and the difference of its load, each chain link DC capacitor voltage unbalance can be caused, in progressively boost process, this material unaccounted for is increasing apart from meeting, the chain link draw-out power supply caused even can not start, some chain links produce DC capacitor superpotential when not reaching change of current chain test withstand voltage, cannot complete between end and test, trace it to its cause mainly experiment power supply when low-voltage caused by output power and the rate of rise.
For DC voltage imbalance problem in start-up course, equalizer circuit can be designed in link units, circuit forms primarily of power resistor and switching device, start equalizer circuit when DC voltage is higher and force balanced d. c capacitance voltage, but the method will certainly increase loss and the cost of device.
As Fig. 3, the utility model provides pipe testing circuit between a kind of chain type STATCOM change of current end of the chain, and described change of current chain is composed in series by multiple link units; Described link units comprises DC bus support capacitor, draw-out power supply, entirely controls device, trigger circuit, pass devices, heating radiator and link units controller; Described hookup comprises input control module, boost module, measuring and protecting module, tested module and charging module; After described input control module is connected with boost module, in parallel respectively with measurement module, tested module and charging module.
Described input control module comprises the first power supply and the first switch cubicle;
First power supply is the AC power of 10KV and 10KV above, and its amount of capacity need meet the power of change of current chain between holding during withstand voltage test needed for the static normal work of each link units;
The electric pressure of the first switch cubicle is identical with the electric pressure of the first power supply, and its capacity and boost module match, and measuring and protecting module controls the first switch cubicle, to realize the protection to change of current chain.
Described boost module comprises pressure regulator, step-up transformer and current-limiting resistance;
The electric pressure of described pressure regulator meets the electric pressure of the first power supply, and its capacity and step-up transformer power match;
Voltage on the winding of former limit is raised by vice-side winding by described step-up transformer, its vice-side winding is made up of Multiple coil, Multiple coil adopts serial or parallel connection mode to connect output voltage for changing described step-up transformer and output current, with meet change of current chain held between the demand of withstand voltage test;
The output current of described current-limiting resistance to step-up transformer limits, and avoids step-up transformer to damage because of overload.
Described measuring and protecting module comprises the first current sensor for gathering pressure regulator output current, for gathering the second current sensor of step-up transformer output current, voltage sampling circuit, signal collection modulation circuit and control operation platform.
When described first current sensor is used for preventing pressure regulator from breaking down, the first power supply is protected;
When described second current sensor is used for preventing the change of current chain from occurring overcurrent fault, realize the protection to step-up transformer, pressure regulator and the first power supply;
Described voltage sampling circuit is used for, to the sampling of transformer output voltage by voltage after capacitor dividing potential drop, realizing the supervision to voltage between the change of current end of the chain and superpotential protection;
After described signal collection modulation circuit processes the output voltage of step-up transformer and output current, be uploaded to described control operation platform and complete the display of data and the collection of data.
Described tested module comprises change of current chain, the first isolating switch and the second isolating switch;
Described change of current chain is composed in series by multiple link units; Described link units comprises DC bus support capacitor, draw-out power supply, entirely controls device, trigger circuit, pass devices, heating radiator and link units controller;
Described first isolating switch and the second isolating switch complete the switching between boost module and charging module, the electric pressure of code requirement when both to need to meet between the change of current end of the chain the highest trial voltage.
Described charging module comprises and softly opens resistance, second switch cabinet and second source;
Second source is charged to the DC bus support capacitor in each link units of change of current chain by the soft resistance that opens, and meets energy required when each draw-out power supply starts in each link units of change of current chain;
The electric pressure of second switch cabinet is identical with the electric pressure of second source, can carry out control and protection to second source.
Finally should be noted that: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; those of ordinary skill in the field still can modify to embodiment of the present utility model with reference to above-described embodiment or equivalent replacement; these do not depart from any amendment of the utility model spirit and scope or equivalent replacement, are all applying within the claims of the present utility model awaited the reply.
Claims (7)
1. a pipe testing circuit between the chain type STATCOM change of current end of the chain, is characterized in that: described hookup comprises input control module, boost module, measuring and protecting module, tested module and charging module; After described input control module is connected with boost module, in parallel respectively with measurement module, tested module and charging module.
2. pipe testing circuit between the chain type STATCOM change of current end of the chain according to claim 1, is characterized in that: described input control module comprises the first power supply and the first switch cubicle;
First power supply is the AC power of 10KV and 10KV above, and its amount of capacity need meet the power of change of current chain between holding during withstand voltage test needed for the static normal work of each link units;
The electric pressure of the first switch cubicle is identical with the electric pressure of the first power supply, and its capacity and boost module match, and measuring and protecting module controls the first switch cubicle, to realize the protection to change of current chain.
3. pipe testing circuit between the chain type STATCOM change of current end of the chain according to claim 1, is characterized in that: described boost module comprises pressure regulator, step-up transformer and current-limiting resistance;
The electric pressure of described pressure regulator meets the electric pressure of the first power supply, and its capacity and step-up transformer power match;
Voltage on the winding of former limit is raised by vice-side winding by described step-up transformer, its vice-side winding is made up of Multiple coil, Multiple coil adopts serial or parallel connection mode to connect output voltage for changing described step-up transformer and output current, with meet change of current chain held between the demand of withstand voltage test;
The output current of described current-limiting resistance to step-up transformer limits, and avoids step-up transformer to damage because of overload.
4. pipe testing circuit between the chain type STATCOM change of current end of the chain according to claim 1, is characterized in that: described measuring and protecting module comprises the first current sensor for gathering pressure regulator output current, for gathering the second current sensor of step-up transformer output current, voltage sampling circuit, signal collection modulation circuit and control operation platform.
5. pipe testing circuit between the chain type STATCOM change of current end of the chain according to claim 4, is characterized in that: protect the first power supply when described first current sensor is used for preventing pressure regulator from breaking down;
When described second current sensor is used for preventing the change of current chain from occurring overcurrent fault, realize the protection to step-up transformer, pressure regulator and the first power supply;
Described voltage sampling circuit is used for, to the sampling of transformer output voltage by voltage after capacitor dividing potential drop, realizing the supervision to voltage between the change of current end of the chain and superpotential protection;
After described signal collection modulation circuit processes the output voltage of step-up transformer and output current, be uploaded to described control operation platform and complete the display of data and the collection of data.
6. pipe testing circuit between the chain type STATCOM change of current end of the chain according to claim 1, is characterized in that: described tested module comprises change of current chain, the first isolating switch and the second isolating switch;
Described first isolating switch and the second isolating switch complete the switching between boost module and charging module, the electric pressure of code requirement when both to need to meet between the change of current end of the chain the highest trial voltage.
7. pipe testing circuit between the chain type STATCOM change of current end of the chain according to claim 1, is characterized in that: described charging module comprises and softly opens resistance, second switch cabinet and second source;
Second source is charged to the DC bus support capacitor in each link units of change of current chain by the soft resistance that opens, and meets energy required when each draw-out power supply starts in each link units of change of current chain;
The electric pressure of second switch cabinet is identical with the electric pressure of second source, can carry out control and protection to second source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520357546.2U CN204649913U (en) | 2015-05-29 | 2015-05-29 | Pipe testing circuit between a kind of chain type STATCOM change of current end of the chain |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520357546.2U CN204649913U (en) | 2015-05-29 | 2015-05-29 | Pipe testing circuit between a kind of chain type STATCOM change of current end of the chain |
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| Publication Number | Publication Date |
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| CN204649913U true CN204649913U (en) | 2015-09-16 |
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| CN201520357546.2U Expired - Fee Related CN204649913U (en) | 2015-05-29 | 2015-05-29 | Pipe testing circuit between a kind of chain type STATCOM change of current end of the chain |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107966975A (en) * | 2016-10-19 | 2018-04-27 | 中兴通讯股份有限公司 | A kind of fan control board test system and method |
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2015
- 2015-05-29 CN CN201520357546.2U patent/CN204649913U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107966975A (en) * | 2016-10-19 | 2018-04-27 | 中兴通讯股份有限公司 | A kind of fan control board test system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Li Xiang Inventor after: Han Tianxu Inventor after: Yan Hui Inventor after: Wei Hong Inventor after: Chang Zhong Inventor after: Wang Ke Inventor before: Han Tianxu Inventor before: Yan Hui Inventor before: Wei Hong Inventor before: Chang Zhong Inventor before: Wang Ke |
|
| CB03 | Change of inventor or designer information | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 102200 Beijing city Changping District South Shao Zhen Nan Road No. 16 Co-patentee after: NARI Group Corp. Patentee after: CHINA EPRI SCIENCE & TECHNOLOGY Co.,Ltd. Address before: 102200 Beijing city Changping District South Shao Zhen Nan Road No. 16 Co-patentee before: NANJING NARI Group Corp. Patentee before: CHINA EPRI SCIENCE & TECHNOLOGY Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150916 |
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| CF01 | Termination of patent right due to non-payment of annual fee |