CN214154020U - 10kV series active voltage regulating system - Google Patents
10kV series active voltage regulating system Download PDFInfo
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- CN214154020U CN214154020U CN202022786579.2U CN202022786579U CN214154020U CN 214154020 U CN214154020 U CN 214154020U CN 202022786579 U CN202022786579 U CN 202022786579U CN 214154020 U CN214154020 U CN 214154020U
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Abstract
The utility model discloses a 10kV series active voltage regulating system, which comprises a high-voltage loop and a low-voltage loop; the low-voltage circuit comprises a main circuit unit and a low-voltage bypass unit; the main circuit unit comprises a step-down transformer, the primary side of the step-down transformer is connected with a 10kV voltage input end, the secondary side of the step-down transformer is connected with an input filtering unit, the input filtering unit is connected to a power conversion unit, the power conversion unit is connected to an output filtering unit, the output filtering unit is connected with a low-voltage bypass unit, and the low-voltage bypass unit is connected to the primary side of the step-up transformer. The utility model discloses a system gets the electricity from 10kV circuit, gives the power conversion unit and the low pressure part power supply such as low pressure bypass unit after the transformer step-down, obtains the voltage that needs the compensation through the power conversion unit, steps up back and 10kV electric wire netting stack through step-up transformer, guarantees the voltage stability of load end.
Description
Technical Field
The utility model belongs to the electric energy quality administers the field, relates to a novel active voltage governing system.
Background
In remote areas, the power distribution network is slowly developed, the capacity of a 10kV distribution network power supply transformer is generally small, the wire diameter of a power supply line is small, the power supply radius is large, and accordingly wire loss is serious. Along with the improvement of living standard of people, household electric equipment is more and more, and the power consumption load is bigger and bigger, leads to the low voltage condition of circuit end more and more outstanding, and obviously presents the peak period and the valley period of power consumption.
One of the traditional ways of improving the tail end voltage of the line is to improve the tail end voltage of the line from a power supply side, such as newly-built transformer stations and main transformer on-load voltage regulation, and the like, the improvement period is generally long, and the improvement cost is very high or the improvement effect is not obvious; one is a modification from a line, such as a series voltage regulator on the line or a series compensation capacitor to stabilize the terminal voltage of the line, and the like, and generally has long response, poor control precision and unobvious voltage regulating effect.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the problem of low voltage at the tail end of a 10kV line in the background technology is solved, and voltage regulation at a load end can be realized.
In order to solve the technical problem, the utility model provides a 10kV series connection active voltage control system, the theory of operation is that get the electricity from the 10kV electric wire netting, after stepping down through the transformer, go out the difference of electric wire netting voltage and rated voltage through the rectification contravariant, then after stepping up through step up transformer superposes with input electric wire netting voltage, guarantees the stability of 10kV circuit end voltage.
A10 kV series active voltage regulation system comprises a high-voltage loop and a low-voltage loop;
the low-voltage circuit comprises a main circuit unit and a low-voltage bypass unit;
the main circuit unit comprises a step-down transformer, the primary side of the step-down transformer is connected with a 10kV voltage input end, the secondary side of the step-down transformer is connected with an input filtering unit, the input filtering unit is connected to a power conversion unit, the power conversion unit is connected to an output filtering unit, the output filtering unit is connected with a low-voltage bypass unit, and the low-voltage bypass unit is connected to the primary side of the step-up transformer;
the high-voltage loop comprises a 10kV voltage input end, and the 10kV voltage input end is sequentially connected with an input isolation switch 3, a secondary side of a step-up transformer 8 and an output isolation switch 9 in series and then connected to a load; two ends of the high-voltage bypass switch are respectively connected with the 10kV voltage input end and the load.
The utility model discloses the beneficial effect who reaches is: the utility model provides a novel 10kV establish ties active voltage governing system gets the electricity from the 10kV electric wire netting, after stepping down through the transformer, obtains the difference voltage through rectification and contravariant, and voltage compensation is realized with the mode of input voltage coupling to rethread step up transformer. The utility model discloses a low pressure bypass and high pressure bypass combine together, and the low pressure bypass has guaranteed that only voltage just lets the main road put into operation when unusual, has improved the life-span of equipment. Meanwhile, under the condition that the load is not powered off, the high-voltage bypass realizes the online overhaul and maintenance of the equipment.
Drawings
Fig. 1 is a schematic block diagram of a 10kV series active voltage regulating system of the present invention;
fig. 2 is an electrical schematic diagram of the main road unit of the present invention;
FIG. 3 is an electrical schematic diagram of the low voltage bypass unit of the present invention;
FIG. 4 is an electrical schematic diagram of the high voltage circuit portion of the present invention;
fig. 5 is an electrical schematic diagram of an ACAC converter of the power conversion unit.
Labeled as: 1. a high voltage bypass switch; 2. a low-pressure bypass unit; 3. inputting an isolation switch; 4. a step-down transformer; 5. an input filtering unit; an ACAC converter; 7. an output filtering unit; 8. a step-up transformer; 9, outputting an isolation switch; 11. three opposite parallel thyristors; 12. AC contactor
Detailed Description
The present invention will be further described with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
The utility model discloses a 10kV series active voltage regulating system, which comprises a high-voltage loop and a low-voltage loop;
the low-voltage circuit comprises a main circuit unit and a low-voltage bypass unit;
the main circuit unit comprises a step-down transformer, the primary side of the step-down transformer is connected with a 10kV voltage input end, the secondary side of the step-down transformer is connected with an input filtering unit, the input filtering unit is connected to a power conversion unit, the power conversion unit is connected to an output filtering unit, the output filtering unit is connected with a low-voltage bypass unit, and the low-voltage bypass unit is connected to the primary side of the step-up transformer;
the high-voltage loop comprises a 10kV voltage input end, and the 10kV voltage input end is sequentially connected with an input isolation switch 3, a secondary side of a step-up transformer 8 and an output isolation switch 9 in series and then connected to a load; two ends of the high-voltage bypass switch are respectively connected with the 10kV voltage input end and the load.
The voltage of the 10kV voltage input end is reduced by 10kV/440V through the step-down transformer and then supplies power to the low-voltage loop part, the main circuit unit outputs the voltage needing compensation through the inversion of the inverter, and the voltage is boosted by 400V/1150V through the step-up transformer and then is superposed with the voltage of the input power grid to keep the voltage of the load end stable.
The main unit of the low-voltage loop comprises a power conversion unit. The power conversion unit comprises an ACAC converter, the ACAC converter comprises a rectifying circuit and an inverter circuit, the output end of the rectifying circuit is connected with a direct current filter formed by a capacitor to filter output voltage, meanwhile, the power conversion unit has a certain energy storage function, and the filtered output voltage is used as the input of the inverter circuit.
The rectification circuit adopts a three-phase Vienna rectifier, the Vienna topology is a three-level topology, and under the same switching frequency, with the increase of the level number, the ripple wave of the output voltage at the direct current side is smaller, the harmonic content is lower, and the voltage quality is higher; for the power device, the number of switches is reduced, the size can be effectively reduced, the power density is increased, meanwhile, the switch device only needs to bear half of the voltage of the direct current bus, the voltage stress is greatly reduced, and the reliability is further improved.
The inverter circuit adopts a neutral point clamped three-level inverter topology structure, as shown in the inverter circuit of fig. 2. Each phase leg of this circuit topology has 4 IGBT devices, 4 freewheeling diodes and 2 clamping diodes. The direct current side is provided with two capacitors C1 and C2, the capacitance values are equal, so the voltage divided by each capacitor is half of the direct current bus voltage, the middle points of the two series IGBT devices are connected with the middle point of the direct current side capacitor through a clamping diode, the output voltage is clamped at the middle point potential of the direct current side, namely the bearing voltage of each switching device is limited to one capacitor voltage. The clamping diode also has the function of providing a current path to prevent the capacitor from being short-circuited when the switch tube is conducted. Compared with a two-level topology, the three-level topology increases the number of levels, so that the AC output voltage ripple is smaller, and the sine degree is improved.
The output end of the inverter circuit is connected to an output filtering unit, and the output filtering unit adopts an LCL filter to filter the alternating current output voltage into a sine wave.
If automatic control is needed, the control unit is further included and is respectively connected to the output end of the input filtering unit and the ACAC converter, and the control unit judges whether the 10kV voltage is normal or not by monitoring the power grid voltage in real time. When the voltage is detected to exceed the normal range, the inverter circuit is controlled to output corresponding compensation voltage, and the voltage is superposed with the input power grid voltage through the step-up transformer to maintain the stability of the 10kV voltage at the load end.
The monitoring unit is communicated with the control unit through RS485 communication, and then the monitoring unit is communicated with the monitoring background through GPRS. The monitoring background can monitor the running state of the equipment, whether the voltage of the 10kV line is normal or not and whether the voltage of the load end is normal or not in real time, and the background can conveniently count the voltage condition of the line within a period of time.
The low-voltage bypass unit comprises three opposite parallel thyristors 11 and an alternating current contactor 12, wherein the three opposite parallel thyristors 11 and the alternating current contactor 12 are arranged in parallel, and AC, BA and CB at the output end of the inverter are respectively connected with two ends of contacts of the anti-parallel thyristors and the alternating current contactor. The thyristor is used as a bridge when the main path unit and the bypass unit are switched by utilizing the characteristic of quick switching response time of the thyristor, so that seamless switching of the main path unit and the low-voltage bypass unit is realized. When the voltage of the power grid is abnormal, the thyristor is quickly switched in, the alternating current contactor is switched off at the same time, the load end is ensured to be not powered off, after the contactor is reliably switched off, the thyristor is quickly switched off, the inverter is started to operate, and the voltage of the load end is maintained to be stable; when the voltage of the power grid returns to normal, the inverter stops running, the thyristor is put into the inverter, and the thyristor is disconnected after the contactor is reliably closed.
The main function of the high-voltage loop is that when the main circuit unit or the low-voltage bypass unit needs to be maintained or fails and needs to be maintained, the high-voltage bypass switch is closed, the input isolation disconnecting link and the output isolation disconnecting link are disconnected, equipment is maintained under the condition that the load is not powered off, and online maintenance is achieved.
The 10kV series active voltage regulating system of the utility model can work in three states, one is in a low-voltage bypass state, as shown in a loop b in figure 1; one is to operate in the main path operating state, as shown by the c loop in fig. 1; one is to operate in a high pressure bypass state as shown in the a-loop of fig. 1.
Example 2
The ACAC converter of the power conversion unit may also adopt a two-stage three-phase two-level PWM rectifier topology, as shown in fig. 5. In each switching period, the output of the traditional two-level PWM rectifier is a positive level and a negative level, so that the loss is high and the efficiency is low; the defects of large electromagnetic interference, high switching frequency, large equipment volume and the like exist, and the problems can be effectively solved by adopting a three-level topology.
Other technical features are the same as those of embodiment 1.
The utility model discloses based on power electronic transformation technique, through monitoring 10kV line voltage, adjust dc-to-ac converter output voltage to guarantee the stability of terminal voltage with the input voltage stack after stepping up through the transformer. The utility model discloses a switching mode of main road and bypass makes equipment only need be heavier at the load, and the circuit voltage drops into operation when unusual, and is lighter when the load, and when the circuit voltage was normal, then withdrawed from the main road operation, switches to the low pressure bypass state, then effectual reduction equipment operation duration like this, has improved the reliability and the stability of equipment greatly. The utility model discloses a real-time supervision line voltage can quick adjustment dc-to-ac converter output voltage, and the unbalance problem that can effectual compensation line voltage simultaneously guarantees the stability and the phase balance of load terminal voltage, and response time is fast. The utility model discloses the rectification part in the scheme adopts three-phase vienna rectification, and the vienna topology is three level circuit, and equivalent switching frequency is higher, and the output voltage ripple is littleer; the number of switches is reduced, the equipment volume is greatly reduced, and the power density is improved; meanwhile, the power switch tube bears lower voltage stress, and the system reliability and stability are higher.
The above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit the same, and the researchers in the field can still modify or replace the specific embodiments of the present invention with the above embodiments, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention are all within the scope of the claims of the present invention.
Claims (7)
1. The utility model provides a 10kV active voltage governing system that establishes ties which characterized in that:
comprises a high-pressure loop and a low-pressure loop;
the low-voltage circuit comprises a main circuit unit and a low-voltage bypass unit;
the main circuit unit comprises a step-down transformer, the primary side of the step-down transformer is connected with a 10kV voltage input end, the secondary side of the step-down transformer is connected with an input filtering unit, the input filtering unit is connected to a power conversion unit, the power conversion unit is connected to an output filtering unit, the output filtering unit is connected with a low-voltage bypass unit, and the low-voltage bypass unit is connected to the primary side of the step-up transformer;
the high-voltage loop comprises a 10kV voltage input end, and the 10kV voltage input end is sequentially connected with an input isolation switch (3), a secondary side of a step-up transformer (8) and an output isolation switch (9) in series and then connected to a load; two ends of the high-voltage bypass switch are respectively connected with the 10kV voltage input end and the load.
2. The 10kV series active voltage regulation system of claim 1, wherein:
the main unit of the low-voltage loop comprises a power conversion unit;
the power conversion unit comprises an ACAC converter, the ACAC converter comprises a rectifying circuit and an inverter circuit, the output end of the rectifying circuit is connected with a direct current filter formed by a capacitor to filter output voltage, and the filtered output voltage is used as the input of the inverter circuit.
3. The 10kV series active voltage regulation system of claim 2, wherein:
the rectification circuit adopts a three-phase Vienna rectifier, and the Vienna topology is a three-level topology.
4. The 10kV series active voltage regulation system of claim 2, wherein:
the inverter circuit adopts a neutral-point clamped three-level inverter topological structure, each phase bridge arm of the topological structure is provided with 4 IGBT devices, 4 freewheeling diodes and 2 clamping diodes, two capacitors C1 and C2 are arranged on the direct current side, the capacitance values are equal, and the neutral points of the two series IGBT devices are connected with the neutral point of the capacitor on the direct current side through the clamping diodes, so that the output voltage is clamped at the neutral point potential on the direct current side.
5. The 10kV series active voltage regulation system of claim 1, wherein:
the output filtering unit adopts an LCL filter.
6. The 10kV series active voltage regulation system of claim 1, wherein:
the low-voltage bypass unit comprises three opposite parallel thyristors (11) and an alternating current contactor (12), and AC, BA and CB at the output end of the inverter are respectively connected with two ends of contacts of the anti-parallel thyristors and the alternating current contactor.
7. The 10kV series active voltage regulation system of claim 1, wherein:
the main circuit unit of the low-voltage loop comprises a power conversion unit, a control unit and a monitoring unit;
the power conversion unit adopts a two-stage three-phase two-level PWM rectifier topological structure.
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| CN202022786579.2U CN214154020U (en) | 2020-11-26 | 2020-11-26 | 10kV series active voltage regulating system |
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| CN202022786579.2U CN214154020U (en) | 2020-11-26 | 2020-11-26 | 10kV series active voltage regulating system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112583018A (en) * | 2020-11-26 | 2021-03-30 | 国网青海省电力公司果洛供电公司 | 10kV series active voltage adjusting system and method |
| CN113890046A (en) * | 2021-09-30 | 2022-01-04 | 华能伊敏煤电有限责任公司 | Open coal mine 35kV distribution lines quick voltage regulation system |
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2020
- 2020-11-26 CN CN202022786579.2U patent/CN214154020U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112583018A (en) * | 2020-11-26 | 2021-03-30 | 国网青海省电力公司果洛供电公司 | 10kV series active voltage adjusting system and method |
| CN113890046A (en) * | 2021-09-30 | 2022-01-04 | 华能伊敏煤电有限责任公司 | Open coal mine 35kV distribution lines quick voltage regulation system |
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