CN114069417A - Electric intelligent switch cabinet with dynamic voltage regulation function - Google Patents
Electric intelligent switch cabinet with dynamic voltage regulation function Download PDFInfo
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- CN114069417A CN114069417A CN202111312681.1A CN202111312681A CN114069417A CN 114069417 A CN114069417 A CN 114069417A CN 202111312681 A CN202111312681 A CN 202111312681A CN 114069417 A CN114069417 A CN 114069417A
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- 239000003990 capacitor Substances 0.000 claims abstract description 25
- 230000007246 mechanism Effects 0.000 claims abstract description 10
- 238000004804 winding Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 2
- 238000010248 power generation Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 5
- 230000004044 response Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/30—Cabinet-type casings; Parts thereof or accessories therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/24—Circuit arrangements for boards or switchyards
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- Inverter Devices (AREA)
Abstract
The invention relates to the technology of switch cabinets, in particular to an electrical intelligent switch cabinet with a dynamic voltage regulation function, wherein a wire outlet end of the switch cabinet is connected with a frequency modulation module in series, and the frequency modulation module is connected with a bypass mechanism in parallel; the frequency modulation module comprises a single-input multi-output transformer, a power module and an LC filter circuit; the power module comprises a plurality of power unit cascades, a single-input multi-output transformer converts the voltage of a power grid into multi-output three-phase voltage, and each circuit of output voltage is connected to the input end of one power unit; each power unit comprises a three-phase rectifying circuit, a single-phase inverter circuit and a direct-current capacitor, the three-phase rectifying circuit is connected with the direct-current capacitor in parallel, and the output end of the direct-current capacitor is connected with the single-phase inverter circuit in parallel; the LC filter circuit comprises an inductor and a capacitor which are connected in series. The frequency modulation module is integrated in the switch cabinet, so that the switch cabinet changes the active power absorbed by the regional load by adjusting the voltage of the feeder line, the power of a power generation side and the power of a power utilization side is balanced, and the system frequency is stabilized.
Description
Technical Field
The invention belongs to the technical field of switch cabinets, and particularly relates to an electric intelligent switch cabinet with a dynamic voltage regulation function.
Background
The power grid frequency is one of important indexes of the power quality, reflects the balance relation between the active power and the load of power generation, and is an important control parameter for the operation of a power system. The long-term accumulation effect of the frequency deviation can influence the normal work of the electric equipment, so that the guarantee of the stability of the power grid frequency is the basis of the stable operation of the power system.
Because the operation mode adjustment margin of the traditional power grid is small, the problems of heavy load and overload of power transmission and transformation equipment are serious, and huge pressure is generated on regional power grid scheduling. In recent years, with the advance of smart grid construction and the development and application of technologies such as demand response and energy efficiency management, adjustable user-side multi-element voltage sensitive loads such as commercial central air conditioners and common residential electrical appliances are rapidly increased and form new schedulable resources, which brings new changes to regional power grid scheduling operation. Demand response and Voltage Reduction (CVR) is a common load control method. The demand response directs the user to autonomously change the load power by means of electricity prices or incentives, which is effective during normal operation. However, during a blackout, there may be no user response because power is a scarce resource. Different from demand response, the CVR is used as a non-intrusive load control strategy, and can directly reduce load power by reducing node voltage by utilizing load voltage characteristics on the premise of ensuring qualified voltage. The CVR is still effective during blackouts, since it only involves grid level operations. The traditional CVR realizes voltage control by operating a tap gear of a transformer and a capacitor so as to change load power, and with the rapid development of power electronic devices, a dynamic voltage restorer as a potential device can also participate in CVR regulation.
For a 10kV power distribution network, the high-voltage power supply terminal is used as an important junction and channel for connecting a high-voltage power supply side of 110kV, 220kV or more and a low-voltage power utilization side of 380V or 220V, and plays a significant role in ensuring power supply reliability of a power system. The 10kV switch cabinet is used as a metal closed type switch power device and plays an important role in a power distribution network. High-voltage metal enclosed switchgear gathers load switch, isolator, mutual-inductor, condenser, arrester, circuit breaker, contactor, fuse, generating line and corresponding secondary equipment if control, chain, protection, monitoring, communication device equals in the metal casing of a rectangular cabinet-shaped, become a modular electrical apparatus, so not only reduced these power equipment area and shared space, still correspondingly improved the efficiency of transformer substation, equipment also has more safety guarantee under the operational aspect, has improved economic benefits in the very big degree.
Therefore, how to bring the load of the regional user side into the schedulable resource on the premise of not influencing the user experience through the switch cabinet, so as to improve the operation economy and stability of the power system, the technical problem to be solved by the technical staff in the field is urgently needed.
Disclosure of Invention
Aiming at the problems in the background art, the invention provides an electric intelligent switch cabinet which can dynamically adjust the voltage of a feeder line so as to adjust the regional load power.
In order to solve the technical problems, the invention adopts the following technical scheme: an electric intelligent switch cabinet with a dynamic voltage regulation function comprises a handcart type circuit breaker, a current transformer, a grounding disconnecting link, a live display device, a lightning arrester and a zero sequence current transformer; the outlet end of the switch cabinet is connected with a frequency modulation module in series, and the frequency modulation module is connected with a bypass mechanism in parallel; the frequency modulation module comprises a single-input multi-output transformer, a power module and an LC filter circuit; the power module comprises a plurality of power unit cascades, a single-input multi-output transformer converts the voltage of a power grid into multi-output three-phase voltage, and each circuit of output voltage is connected to the input end of one power unit; each power unit comprises a three-phase rectifying circuit, a single-phase inverter circuit and a direct-current capacitor, the three-phase rectifying circuit is connected with the direct-current capacitor in parallel, and the output end of the direct-current capacitor is connected with the single-phase inverter circuit in parallel; the LC filter circuit comprises an inductor and a capacitor which are connected in series.
In the electric intelligent switch cabinet with the dynamic voltage regulation function, the three-phase rectification circuit is a three-phase PWM rectification circuit formed by connecting six IGBT tubes by a three-phase winding, and the single-phase inverter circuit is a single-phase full-bridge PWM inverter circuit formed by a first half-bridge IGBT module and a second half-bridge IGBT module; the IGBT module is formed by connecting an IGBT tube and a freewheeling diode in parallel.
Compared with the prior art, the invention has the beneficial effects that: the frequency modulation module is integrated in the switch cabinet, so that the switch cabinet can balance the power of a power generation side and the power of a power utilization side by adjusting the voltage of the feeder line to change the useful power absorbed by the load in an area, and the aim of stabilizing the system frequency is fulfilled. The power unit is internally provided with a PWM (pulse-width modulation) rectifying circuit and a PMW (pulse-width modulation) inverter circuit which are formed by adopting a conventional IGBT (insulated gate bipolar translator) tube, so that the bidirectional regulation of the voltage of a feeder line can be realized, and when the voltage of the feeder line needs to be increased, the power unit can absorb energy from a power grid and compensate the voltage of the feeder line; when the feeder voltage needs to be reduced, the power unit can absorb the voltage from the feeder and feed the voltage back to the power grid through the device. The modularization of the power units enables the equipment to be convenient to maintain, and the cascade connection of the output ends of the power units with different quantities can meet the normal operation under various voltage levels, so that the applicability of the switch cabinet is wider.
Drawings
Fig. 1 is a schematic wiring diagram of an intelligent fm switch cabinet according to an embodiment of the invention.
Fig. 2 is a schematic diagram of a power unit in a smart fm switch cabinet according to an embodiment of the invention.
Fig. 3 is a schematic diagram of a power module in a smart fm switch cabinet according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
In the embodiment, the frequency modulation module is integrated in the switch cabinet, so that the switch cabinet can balance the power of the power generation side and the power utilization side by adjusting the voltage of the feeder line to change the useful power absorbed by the load in the area, and the purpose of stabilizing the system frequency is achieved.
The embodiment is realized by the following technical scheme that a frequency modulation module is connected in series at the wire outlet end of the traditional switch cabinet, and the frequency modulation module is connected in parallel with a bypass mechanism. The switch cabinet comprises a handcart type circuit breaker, a current transformer, a grounding disconnecting link, a live display device, a lightning arrester, a zero sequence current transformer and a frequency modulation module.
And the frequency modulation module comprises a single-input multi-output transformer, a power module and an LC filter circuit. The single-input multi-output transformer converts the power grid voltage into multi-output three-phase voltage, and each circuit of output voltage is connected to the input end of one power unit. The power module is formed by cascading a plurality of power units, each power unit is formed by connecting an alternating current-direct current conversion circuit to another direct current-alternating current conversion circuit through a direct current capacitor in parallel, and the LC filter circuit is formed by connecting an inductor and a capacitor in series.
And the power unit comprises a three-phase PWM (pulse-width modulation) rectifying circuit formed by connecting six IGBT (insulated gate bipolar transistor) tubes by a three-phase winding, the three-phase PWM rectifying circuit is connected with a direct-current capacitor in parallel, and the output end of the direct-current capacitor is connected with a single-phase full-bridge PWM inverter circuit formed by a half-bridge IGBT module and a half-bridge IGBT module in parallel. Six IGBT tubes of the three-phase PWM rectification circuit use an isolation transformer to supply power as input signals to charge a direct current capacitor, the output end of the direct current capacitor is connected with a single-phase PWM inverter circuit, and the output end of the single-phase PWM inverter circuit is connected to two ends of a bypass mechanism. The three-phase PWM rectifying circuit and the direct current capacitor form an energy storage device of the power unit.
The power unit is internally provided with a PWM (pulse-width modulation) rectifying circuit and a PMW (pulse-width modulation) inverter circuit which are formed by adopting a conventional IGBT (insulated gate bipolar translator) tube, so that the bidirectional regulation of the voltage of a feeder line can be realized, and when the voltage of the feeder line needs to be increased, the power unit can absorb energy from a power grid and compensate the voltage of the feeder line; when the feeder voltage needs to be reduced, the power unit can absorb the voltage from the feeder and feed the voltage back to the power grid through the device.
In specific implementation, as shown in fig. 1, the handcart type circuit breaker directly connected with a 10kV bus is included, and a current transformer measures and monitors current in an incoming line circuit, converts large current in the circuit into small current according to a certain proportion, and supplies the small current to a measuring instrument and a protection device for use. The grounding disconnecting link and the lightning arrester are both protection devices. The electrified display device is a sensor signal device and is used for displaying the three-phase voltage of the bus. And the zero sequence current transformer is used for acquiring whether the three-phase current is balanced. The frequency modulation module is connected with a bypass mechanism in parallel, when the bypass mechanism is closed, the frequency modulation module does not participate in operation, when the bypass mechanism is disconnected, the frequency modulation module is put into operation, a single-input multi-output transformer is utilized to convert bus voltage into a plurality of three-phase voltages lower than the output of the bus voltage, and each circuit output voltage is connected to the access end of one group of power units.
As shown in fig. 2, the power unit includes a three-phase PWM rectifier circuit composed of three-phase windings a, b, c and six IGBT modules, each IGBT module is composed of an IGBT tube and a freewheeling diode connected in parallel, and the output end of the three-phase PWM rectifier circuit is connected in parallel with a dc capacitor to jointly constitute an energy storage device. The output end of the direct current capacitor is connected with a single-phase full-bridge PWM inverter circuit consisting of a first half-bridge IGBT module and a second half-bridge IGBT module in parallel. After the circuit is switched on, a control system consisting of the detection circuit board, the operation circuit board and the PWM signal generation circuit board controls six IGBT tubes of the PWM three-phase rectification circuit to charge the direct-current capacitor, so that the voltage stability of the direct-current capacitor is ensured. The output end of the direct current capacitor is connected with the single-phase PWM inverter circuit, and when the voltage of a feeder line needs to be increased, the control system controls four IGBT tubes of the single-phase PWM inverter circuit to generate inverter output; when the voltage of the feeder line needs to be reduced, the control system controls the four IGBT tubes to absorb the voltage, and the energy is fed back to the power grid through the six IGBT tubes of the PWM rectification circuit.
The modularization of the power units enables the equipment to be convenient to maintain, and the cascade connection of the output ends of the power units with different quantities can meet the normal operation under various voltage levels, so that the applicability of the switch cabinet is wider. As shown in fig. 3, taking three powers connected in parallel as an example, each power module includes two power units, the two power units of each power module are connected in series and then output, each power module includes a single-input multi-output transformer as an input signal, the input signal is connected with an input end of each power module, output ends of the two power units are connected in series and then output to form single-phase power, and the three power modules output three-phase power and feeder voltage in series to achieve the purpose of adjusting the feeder voltage.
The working modes of the frequency modulation switch cabinet mainly comprise: bypass mode, regulation mode. When the bypass mechanism connected with the frequency modulation module in parallel is closed, the frequency modulation module does not participate in operation, and the frequency modulation module can be regularly maintained and overhauled at the moment without influencing normal power supply. When the bypass mechanism is disconnected, the frequency modulation module can adjust the voltage of the feeder line according to the monitored system frequency to change the active power absorbed by the load, so that the frequency stability is achieved.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (2)
1. An electric intelligent switch cabinet with a dynamic voltage regulation function comprises a handcart type circuit breaker, a current transformer, a grounding disconnecting link, a live display device, a lightning arrester and a zero sequence current transformer; the method is characterized in that: the outlet end of the switch cabinet is connected with a frequency modulation module in series, and the frequency modulation module is connected with a bypass mechanism in parallel; the frequency modulation module comprises a single-input multi-output transformer, a power module and an LC filter circuit; the power module comprises a plurality of power unit cascades, a single-input multi-output transformer converts the voltage of a power grid into multi-output three-phase voltage, and each circuit of output voltage is connected to the input end of one power unit; each power unit comprises a three-phase rectifying circuit, a single-phase inverter circuit and a direct-current capacitor, the three-phase rectifying circuit is connected with the direct-current capacitor in parallel, and the output end of the direct-current capacitor is connected with the single-phase inverter circuit in parallel; the LC filter circuit comprises an inductor and a capacitor which are connected in series.
2. The electrical intelligent switch cabinet with the dynamic voltage regulation function according to claim 1, characterized in that: the three-phase rectification circuit is a three-phase PWM rectification circuit formed by connecting six IGBT tubes with a three-phase winding, and the single-phase inverter circuit is a single-phase full-bridge PWM inverter circuit formed by a first half-bridge IGBT module and a second half-bridge IGBT module; the IGBT module is formed by connecting an IGBT tube and a freewheeling diode in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111312681.1A CN114069417A (en) | 2021-11-08 | 2021-11-08 | Electric intelligent switch cabinet with dynamic voltage regulation function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111312681.1A CN114069417A (en) | 2021-11-08 | 2021-11-08 | Electric intelligent switch cabinet with dynamic voltage regulation function |
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| CN114069417A true CN114069417A (en) | 2022-02-18 |
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| CN202111312681.1A Pending CN114069417A (en) | 2021-11-08 | 2021-11-08 | Electric intelligent switch cabinet with dynamic voltage regulation function |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101403780A (en) * | 2008-11-13 | 2009-04-08 | 中国电力科学研究院 | Laboratory test device and method for dynamic electric voltage recovery device |
| CN101841158A (en) * | 2010-04-09 | 2010-09-22 | 上海电气集团股份有限公司 | 10kV dynamic voltage restorer based on cascade of power units |
| CN113507217A (en) * | 2021-08-12 | 2021-10-15 | 南京智睿能源互联网研究院有限公司 | Single-phase transformer isolation series type dynamic voltage adjusting device |
-
2021
- 2021-11-08 CN CN202111312681.1A patent/CN114069417A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101403780A (en) * | 2008-11-13 | 2009-04-08 | 中国电力科学研究院 | Laboratory test device and method for dynamic electric voltage recovery device |
| CN101841158A (en) * | 2010-04-09 | 2010-09-22 | 上海电气集团股份有限公司 | 10kV dynamic voltage restorer based on cascade of power units |
| CN113507217A (en) * | 2021-08-12 | 2021-10-15 | 南京智睿能源互联网研究院有限公司 | Single-phase transformer isolation series type dynamic voltage adjusting device |
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