CN110365101B - Electric energy quality treatment device - Google Patents
Electric energy quality treatment device Download PDFInfo
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- CN110365101B CN110365101B CN201910637590.1A CN201910637590A CN110365101B CN 110365101 B CN110365101 B CN 110365101B CN 201910637590 A CN201910637590 A CN 201910637590A CN 110365101 B CN110365101 B CN 110365101B
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- 238000005259 measurement Methods 0.000 claims abstract description 51
- 238000003908 quality control method Methods 0.000 claims abstract description 13
- 238000004146 energy storage Methods 0.000 claims description 50
- 238000002955 isolation Methods 0.000 claims description 50
- 230000000903 blocking effect Effects 0.000 claims description 36
- 239000003990 capacitor Substances 0.000 claims description 26
- 230000000087 stabilizing effect Effects 0.000 claims description 12
- 230000010355 oscillation Effects 0.000 claims description 8
- 238000005067 remediation Methods 0.000 claims 3
- 230000036632 reaction speed Effects 0.000 abstract description 5
- 230000006872 improvement Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000001052 transient effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000002860 competitive effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The invention discloses an electric energy quality control device, which comprises a transformer substation power supply circuit, a standby power supply circuit, a step-down transformer and a measurement and control module; the electric energy quality control device is provided with a power supply input end and a power supply output end which are used for being connected with the transformer substation; the input end of the transformer substation power circuit is connected with the power input end; the input end of the transformer substation power circuit is connected with the first output end of the measurement and control module, the output end of the transformer substation power circuit is connected with the input end of the measurement and control module, the input end of the standby power circuit is electrically connected with the second output end of the measurement and control module, and the output end of the transformer substation power circuit and the output end of the standby power circuit are both connected with the high-voltage side of the step-down transformer; the low-voltage side of the step-down transformer is connected with the power output end, an effective comprehensive treatment device is provided for regional and large-scale medium-voltage large-capacity power quality, the running loss of the device can be effectively reduced, and the reaction speed is high.
Description
Technical Field
The invention relates to the technical field of power quality control, in particular to a power quality control device.
Background
With the large-scale development of industrial economy, large-capacity and high-precision industrial products are applied more and more, and the application requirements on a power grid are higher and higher. The problem of the quality of electric energy is more and more emphasized by people, and the most direct problem caused by the problem of the quality of the electric energy is that the normal production of the industry is damaged, so that huge economic loss is brought. For example: for sensitive users (such as semiconductor manufacturing enterprises), voltage sag of tens of milliseconds may cause equipment damage, production line stoppage, and huge economic loss. At present, the golden period of the rapid development of industrial economy in China is positive, and the quality of electric energy is about the development level and competitive strength of products in the whole industrial process, such as computers, information equipment and precision. Instruments, high-end manufacturing, etc. Therefore, the problem of the power quality is not only the technical problem of the power grid, but also the overall benefit of the whole national economy.
The existing DVR is mainly aimed at a certain terminal point such as a power grid side sensitive user, the capacity of the domestic DVR product is small, the DVR product is used for low voltage grade, and a comprehensive treatment device suitable for regional and large-scale medium-voltage large-capacity electric energy quality is not provided.
Disclosure of Invention
The embodiment of the invention provides an electric energy quality treatment device, which provides an effective comprehensive treatment device for regional and large-scale medium-voltage large-capacity electric energy quality, can effectively reduce the running loss of the device, and has high reaction speed.
An embodiment of the invention provides an electric energy quality control device, which comprises a transformer substation power circuit, a standby power circuit, a step-down transformer and a measurement and control module; the electric energy quality control device is provided with a power supply input end and a power supply output end which are used for being connected with a transformer substation; the input end of the transformer substation power circuit is connected with the power input end; the input end of the transformer substation power circuit is connected with the first output end of the measurement and control module, the output end of the transformer substation power circuit is connected with the input end of the measurement and control module, the input end of the standby power circuit is electrically connected with the second output end of the measurement and control module, and the output end of the transformer substation power circuit and the output end of the standby power circuit are both connected with the high-voltage side of the step-down transformer; the low-voltage side of the step-down transformer is connected with the power output end;
the transformer substation power circuit comprises a high-frequency zero-crossing circuit and a breaker; the first end of the circuit breaker is connected with the input end of the transformer substation power circuit, and the second end of the circuit breaker is connected with the output end of the transformer substation power circuit; the high-frequency zero-crossing loop is electrically connected to two ends of the circuit breaker in parallel; a first output end of the measurement and control module is respectively connected with a first end of the circuit breaker and an input end of the high-frequency zero-crossing loop;
the standby power supply circuit comprises a step-up transformer, a reverse-resistance IGBT circuit and an inversion module; the high-voltage side of the boosting transformer is connected with the output end of the standby power circuit, the low-voltage side of the boosting transformer is connected with the output end of the inversion module, and the input end of the inversion module is connected with the input end of the standby power circuit; the second output end of the measurement and control module is respectively connected with the input ends of the reverse resistance type IGBT circuit and the inversion module; the reverse blocking type IGBT circuit is arranged on the low-voltage side of the boosting transformer.
As a refinement of the above solution, the high-frequency zero-crossing circuit includes a thyristor;
the anode of the thyristor is connected with the input end of the high-frequency zero-crossing loop, the cathode of the thyristor is connected with the output end of the high-frequency zero-crossing loop, and the gate of the thyristor is connected with the first output end of the measurement and control module.
As an improvement of the above scheme, the high-frequency zero-crossing loop further comprises a vibration inductor, a first energy storage capacitor and a freewheeling diode;
the first end of the first energy storage capacitor is connected with the cathode of the thyristor, the second end of the first energy storage capacitor is connected with the first end of the oscillation inductor, the second end of the oscillation inductor is connected with the output end of the high-frequency zero-crossing loop, and the freewheeling diode is connected with the two ends of the thyristor in a reverse parallel mode.
As an improvement of the above scheme, the substation power supply circuit further comprises a first isolation disconnecting link, a second isolation disconnecting link and a third isolation disconnecting link;
the input end of the transformer substation power supply circuit is connected with the first end of the second isolation disconnecting link and the first end of the first isolation disconnecting link, and the second end of the second isolation disconnecting link is connected with the first end of the circuit breaker; the first end of the third isolation disconnecting link is connected with the second end of the circuit breaker, and the output end of the transformer substation power supply circuit is connected with the second end of the third isolation disconnecting link and the second end of the first isolation disconnecting link.
As a modification of the above scheme, the high-frequency zero-crossing loop further comprises a piezoresistor;
the first end of the piezoresistor is connected with the input end of the high-frequency zero-crossing loop, and the second end of the piezoresistor is connected with the output end of the high-frequency zero-crossing loop.
As an improvement of the above scheme, the standby power circuit further includes a second energy storage capacitor, a voltage stabilizing module and an energy storage power supply;
the input end of the inversion module is connected with the first end of the second energy storage capacitor, the second end of the second energy storage capacitor is connected with the output end of the voltage stabilizing module, the input end of the voltage stabilizing module is connected with the output end of the energy storage power supply, and the input end of the energy storage power supply is connected with the input end of the standby power supply circuit.
As an improvement of the above scheme, the reverse-blocking type IGBT circuit includes a first reverse-blocking type IGBT, a second reverse-blocking type IGBT, and a third reverse-blocking type IGBT;
the second end of the second reverse blocking type IGBT is connected with the first end of the third reverse blocking type IGBT, the first end of the first reverse blocking type IGBT is connected with the first end of the second reverse blocking type IGBT, and the second end of the first reverse blocking type IGBT is connected with the second end of the third reverse blocking type IGBT;
the A end of the low-voltage side of the boosting transformer is connected with the first end of the first reverse-resistance type IGBT, the B end of the low-voltage side of the boosting transformer is connected with the second end of the second reverse-resistance type IGBT, and the C end of the low-voltage side of the boosting transformer is connected with the second end of the first reverse-resistance type IGBT.
As an improvement of the scheme, the energy storage power source is a flywheel energy storage system, a super capacitor energy storage system or a storage battery energy storage system.
As an improvement of the above scheme, the power quality management device further comprises a fourth isolation switch;
and the first end of the fourth isolation switch is connected with the power supply input end, and the second end of the fourth isolation switch is connected with the input end of the standby power supply circuit.
As an improvement of the scheme, the circuit breaker is a quick repulsion switch.
Compared with the prior art, the electric energy quality control device disclosed by the embodiment of the invention comprises a transformer substation power supply circuit, a standby power supply circuit, a step-down transformer and a measurement and control module; the electric energy quality control device is provided with a power supply input end and a power supply output end which are used for being connected with a transformer substation; the input end of the transformer substation power circuit is connected with the power input end; the input end of the transformer substation power circuit is connected with the first output end of the measurement and control module, the output end of the transformer substation power circuit is connected with the input end of the measurement and control module, the input end of the standby power circuit is electrically connected with the second output end of the measurement and control module, and the output end of the transformer substation power circuit and the output end of the standby power circuit are both connected with the high-voltage side of the step-down transformer; the low-voltage side of the step-down transformer is connected with the power output end; the transformer substation power circuit comprises a high-frequency zero-crossing circuit and a breaker; the first end of the circuit breaker is connected with the input end of the transformer substation power circuit, and the second end of the circuit breaker is connected with the output end of the transformer substation power circuit; the high-frequency zero-crossing loop is electrically connected to two ends of the circuit breaker in parallel; a first output end of the measurement and control module is respectively connected with a first end of the circuit breaker and an input end of the high-frequency zero-crossing loop; the standby power supply circuit comprises a step-up transformer, a reverse-resistance IGBT circuit and an inversion module; the high-voltage side of the boosting transformer is connected with the output end of the standby power circuit, the low-voltage side of the boosting transformer is connected with the output end of the inversion module, and the input end of the inversion module is connected with the input end of the standby power circuit; the second output end of the measurement and control module is respectively connected with the input ends of the reverse resistance type IGBT circuit and the inversion module; the reverse blocking type IGBT circuit is arranged on the low-voltage side of the boosting transformer. By adopting the structure, when the transformer station normally operates, the step-down transformer is conducted and supplies power through the transformer station power circuit, the low-voltage side of the step-up transformer of the standby power circuit is kept in a short-circuit state through the reverse-resistance type IGBT circuit, the standby power current is kept in a standby state, when the measurement and control module detects that voltage sag occurs on the high-voltage side of the step-down transformer, the high-frequency zero-crossing circuit responds to a trigger signal to generate high-frequency oscillation current, so that the circuit breaker is disconnected in a zero-crossing way, the transformer station power circuit is cut off, meanwhile, the measurement and control module controls the reverse-resistance type IGBT circuit to stop conducting, the inversion module outputs current, so that the standby power circuit supplies power to the step-down transformer, the voltage sag problem of a high-voltage grade power grid can be treated, the circuit breaker is conducted by utilizing the circuit breaker in normal operation, loss is avoided, and the circuit breaker is matched with the high-frequency zero-crossing circuit to isolate the transformer station power circuit when voltage sag occurs, meanwhile, a standby power supply circuit is started to realize seamless switching of double power supplies, so that the running loss of the device can be effectively improved, and the reaction speed is high; transient overvoltage in a high-frequency zero-crossing loop can be effectively isolated by using the advantage of high insulation level of high-voltage windings of the step-up transformer and the step-down transformer, and the operation risk of the device can be effectively reduced; the reverse-resistance IGBT circuit is utilized to carry out loop short circuit on the secondary side of the booster transformer, the power circuit of the transformer substation can be effectively isolated, and the reverse-resistance IGBT circuit is used for realizing high cut-off speed and bidirectional conduction.
Drawings
Fig. 1 is a schematic structural diagram of an electric energy quality management device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a reverse blocking IGBT circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the 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.
Referring to fig. 1, which is a schematic structural diagram of an electric energy quality management device provided in an embodiment of the present invention, the electric energy quality management device includes a substation power supply circuit 1, a standby power supply circuit 2, a step-down transformer 3, and a measurement and control module 4; the power quality control device is provided with a power input end V1 and a power output end V2 which are used for being connected with a transformer substation; the input end of the transformer substation power circuit 1 is connected with the power input end V1; the input end of the transformer substation power circuit 1 is connected with the first output end of the measurement and control module 4, the output end of the transformer substation power circuit 1 is connected with the input end of the measurement and control module 4, the input end of the standby power circuit 2 is electrically connected with the second output end of the measurement and control module 4, and the output end of the transformer substation power circuit 1 and the output end of the standby power circuit 2 are both connected with the high-voltage side of the step-down transformer 3; the low-voltage side of the step-down transformer 3 is connected with the power output end V2;
the substation power circuit 1 comprises a high-frequency zero-crossing loop 11 and a breaker D2; the first end of the breaker D2 is connected with the input end of the transformer substation power circuit 1, and the second end of the breaker D2 is connected with the output end of the transformer substation power circuit 1; the high-frequency zero-crossing loop 11 is electrically connected to two ends of the circuit breaker D2 in parallel; a first output end of the measurement and control module 4 is connected with a first end of the circuit breaker D2 and an input end of the high-frequency zero-crossing loop 11 respectively;
the standby power supply circuit 2 comprises a step-up transformer 21, a reverse-resistance IGBT circuit 22 and an inversion module 23; the high-voltage side of the step-up transformer 21 is connected with the output end of the standby power circuit 2, the low-voltage side of the step-up transformer 21 is connected with the output end of the inversion module 23, and the input end of the inversion module 23 is connected with the input end of the standby power circuit 2; a second output end of the measurement and control module 4 is connected with input ends of the reverse resistance type IGBT circuit 22 and the inversion module 23 respectively; the reverse blocking type IGBT circuit 22 is provided on the low voltage side of the step-up transformer.
It should be noted that the measurement and control module 4 is a chip or a microprocessor having a voltage detection function, and is configured to detect a voltage condition at the high voltage side of the step-down transformer 3, that is, a voltage output condition of the substation power circuit 1. In this embodiment, the step-down transformer 3 may be a transformer that converts 10kV to 400V. The reverse-resistance type IGBT circuit 22 is installed on the low-voltage side of the booster transformer 21, short-circuits the secondary side, and then immediately cuts off and conducts after receiving the measurement and control signal sent by the measurement and control module 4. Therefore, when the transformer power circuit 1 is switched on during normal operation, when the measurement and control module 4 detects that the voltage of the transformer power circuit 1 drops temporarily, a trigger signal is generated and sent to the high-frequency zero-crossing loop 11, and a measurement and control signal is generated and sent to the reverse resistance type IGBT circuit 22, the circuit breaker D2 and the inverter module 23, so that the standby power circuit 2 is switched quickly.
Through adopting above structure, when normal operation, step-down transformer 3 switches on and supplies power through transformer substation power supply circuit 1, the low-voltage side of step-up transformer 21 of stand-by power supply circuit 2 keeps the short circuit state through reverse resistance type IGBT circuit 22, and stand-by power supply circuit 2 keeps the standby state, when observing and controlling module 4 and detecting that step-down transformer 3 high-pressure side takes place the voltage sag, high frequency zero cross loop 11 generates high frequency oscillating current after responding to trigger signal, make circuit breaker D2 zero cross break, thereby cut off transformer substation power supply circuit 1, observing and controlling module 4 control reverse resistance type IGBT circuit 22 simultaneously and stop switching on, make inversion module 23 output current, thereby stand-by power supply circuit 2 supplies power to step-down transformer 3.
In an alternative embodiment, the high frequency zero crossing loop 11 includes a thyristor J1;
the anode of the thyristor J1 is connected to the input end of the high-frequency zero-crossing circuit 11, the cathode of the thyristor J1 is connected to the output end of the high-frequency zero-crossing circuit 11, and the gate of the thyristor J1 is connected to the first output end of the measurement and control module 4.
It should be noted that, when the measurement and control module 4 detects that a voltage sag occurs on the high-voltage side of the step-down transformer 3, the gate of the thyristor J1 responds to the trigger signal sent by the measurement and control module 4, the thyristor J1 is turned on and generates a high-frequency oscillating current, so that the breaker D2 is turned on and off at a zero crossing.
In an optional embodiment, the high-frequency zero-crossing loop 11 further includes an oscillating inductor L1, a first energy storage capacitor C1, and a freewheeling diode D1;
the first end of the first energy storage capacitor C1 is connected with the cathode of the thyristor J1, the second end of the first energy storage capacitor C1 is connected with the first end of the oscillation inductor L1, the second end of the oscillation inductor L1 is connected with the output end of the high-frequency zero-crossing circuit 11, and the freewheeling diode D1 is connected with the two ends of the thyristor J1 in an anti-parallel manner.
In the present embodiment, when the transformer substation normally operates, the thyristor J1 is turned off, the step-down transformer 3 is powered by the substation power supply circuit 1, and the first energy storage capacitor C1 maintains the pre-charge state. When voltage sag is detected, the thyristor J1 is triggered to be conducted, the oscillating inductor L1 and the first energy storage capacitor C1 are both used for generating high-frequency current, the current in the breaker D2 is forced to zero crossing, and quick breaking is achieved. In turn, the freewheeling diode D1 is used to provide a freewheeling circuit for the discharge current.
By way of example, in the high-frequency zero-crossing loop 11, when C1 is 510uF and L1 is 14.84uH, the current frequency is calculated as follows:
in an alternative embodiment, the substation power supply circuit 1 further comprises a first isolation switch K1, a second isolation switch K2 and a third isolation switch K3;
the input end of the substation power circuit 1 is connected with the first end of the second isolation switch K2 and the first end of the first isolation switch K1, and the second end of the second isolation switch K2 is connected with the first end of the breaker D2; the first end of the third isolation switch K3 is connected with the second end of the breaker D2, and the output end of the substation power circuit 1 is connected with the second end of the third isolation switch K3 and the second end of the first isolation switch K1.
It should be noted that the second isolation switch K2 and the third isolation switch K3 of the substation power circuit 1 are switched on, and the first isolation switch K1 is switched off. Under the conditions of normal operation and voltage sag, the first isolation disconnecting link, the second isolation disconnecting link K2 and the third isolation disconnecting link K3 are kept in an open-close state.
In an alternative embodiment, the high frequency zero crossing loop 11 further comprises a voltage dependent resistor MOV;
a first end of the varistor MOV is connected to an input of the high-frequency zero-crossing circuit 11, and a second end of the varistor MOV is connected to an output of the high-frequency zero-crossing circuit 11.
It should be noted that the voltage dependent resistor MOV is used to limit the transient overvoltage when the high frequency zero crossing loop 11 artificially and rapidly crosses zero. In this embodiment, the residual voltage amplitude of the transient overvoltage is 14kV, and the power frequency withstand voltage level of the high-voltage side of the step-up transformer 21 and the step-down transformer 3 is 35kV, which is enough to withstand the overvoltage amplitude generated when the transient overvoltage crosses zero manually.
In an alternative embodiment, the standby power circuit 2 further includes a second energy storage capacitor C2, a voltage stabilizing module 24, and an energy storage power supply 25;
the input end of the inverter module 23 is connected to the first end of the second energy storage capacitor C2, the second end of the second energy storage capacitor C2 is connected to the output end of the voltage stabilizing module 24, the input end of the voltage stabilizing module 24 is connected to the output end of the energy storage power supply 25, and the input end of the energy storage power supply 25 is connected to the input end of the standby power supply circuit 2.
It should be noted that the energy storage power supply 25 is used for electric energy storage. The voltage regulator module 24 is a power circuit or microprocessor that maintains the output voltage substantially constant as the input grid voltage fluctuates or the load changes. In this embodiment, the voltage stabilizing module 24 is a dc voltage stabilizing circuit. The inverter module 23 is a circuit device or a microprocessor having a function of converting direct current into alternating current. The second energy storage capacitor C2 is used for storing electric energy. Therefore, when the voltage of the power circuit 1 of the transformer substation drops temporarily, the energy storage power supply 25, the voltage stabilizing module 24, the second energy storage capacitor C2 and the inverter module 23 realize short-time power supply, and the power circuit is configured to have a capacity of 3.5kWh and a rated power of 800 kW.
Fig. 2 is a schematic structural diagram of a reverse blocking IGBT circuit according to an embodiment of the present invention.
In an alternative embodiment, the reverse blocking IGBT circuit 22 includes a first reverse blocking IGBT221, a second reverse blocking IGBT222, and a third reverse blocking IGBT 223;
the second end of the second reverse blocking IGBT222 is connected to the first end of the third reverse blocking IGBT223, the first end of the first reverse blocking IGBT221 is connected to the first end of the second reverse blocking IGBT222, and the second end of the first reverse blocking IGBT221 is connected to the second end of the third reverse blocking IGBT 223;
the end a on the low-voltage side of the step-up transformer 21 is connected to the first end of the first reverse blocking IGBT221, the end B on the low-voltage side of the step-up transformer 21 is connected to the second end of the second reverse blocking IGBT222, and the end C on the low-voltage side of the step-up transformer 21 is connected to the second end of the first reverse blocking IGBT 221.
The reverse blocking IGBT circuit 22 is mounted on the low-voltage side of the step-up transformer 21, and is connected to three terminals on the low-voltage side. When the reverse blocking type IGBT circuit 22 receives the measurement and control signal, it is immediately turned off and on. The parameters are set as rated voltage 2.4kV and rated current 55A. The reverse blocking IGBT is composed of an IGBT and a diode, wherein a cathode of the diode is connected to a collector of the IGBT. In the present embodiment, the first reverse blocking IGBT221 is composed of the IGBTT1 and the second diode D3, the second reverse blocking IGBT222 is composed of the IGBTT2 and the third diode D4, and the third reverse blocking IGBT223 is composed of the IGBTT3 and the fourth diode D5.
In an alternative embodiment, the circuit breaker D2 is a fast repulsion switch.
It should be noted that the fast repulsion switch has a fast opening speed, and can complete the opening operation in a short time. In the embodiment, the switch is conducted by using the quick repulsive force during normal operation, and no loss is caused; when voltage sag occurs, the quick repulsion switch is matched with the manual zero-crossing loop to isolate the power circuit of the transformer substation, and meanwhile, the standby power circuit is started, so that seamless switching of double power supplies is realized, and the reaction speed is high. For example, 10kV circuit breaker has an inherent opening time of 2 ms.
In an alternative embodiment, the energy storage power source 25 is a flywheel energy storage system, a super capacitor energy storage system, or a battery energy storage system.
In an optional embodiment, the power quality management device further comprises a fourth isolation switch K4;
a first terminal of the fourth isolation switch K4 is connected to the power input terminal V1, and a second terminal of the fourth isolation switch K4 is connected to the input terminal of the standby power supply circuit 2.
It should be noted that, when the energy storage power supply 25 of the standby power supply circuit 2 finishes storing energy, the fourth isolation switch K4 automatically opens; when the energy storage power supply 25 of the standby power supply circuit 2 needs to store energy, the fourth isolation switch K4 is automatically switched on, and energy is stored by the power supply of the transformer substation.
The working principle of the embodiment of the invention is as follows:
when the device normally operates, a second isolation disconnecting link K2 and a third isolation disconnecting link K3 of a transformer substation power circuit are switched on, a first isolation disconnecting link K1 is switched off, a breaker D2 is switched on, the step-down transformer 3 supplies power through the transformer substation power circuit 1, and at the moment, the first energy storage capacitor C1 is kept in a pre-charging state. The low-voltage side of the step-up transformer 21 in the backup power supply circuit 2 is kept in a short-circuited state by the reverse-blocking IGBT circuit 22, and the energy storage power supply 25 is kept in a standby state.
When the measurement and control module 4 detects that voltage sag occurs on the high-voltage side of the step-down transformer 3, the power circuit 1 of the transformer substation keeps the second isolation switch K2 and the third isolation switch K3 switched on, the first isolation switch K1 is switched off, the thyristor J1 is triggered and switched on in response to a trigger signal sent by the measurement and control module 4, high-frequency oscillation current is generated, the breaker D2 is switched off at zero crossing, and the power circuit 1 of the transformer substation is switched off. Meanwhile, the measurement and control signal sent by the measurement and control module 4 controls the reverse resistance type IGBT circuit 22 to stop conducting, and the inversion module 23 outputs current, so that the standby power circuit 2 supplies power to the step-down transformer 3, and seamless switching of load power supply is completed.
According to the electric energy quality control device provided by the embodiment of the invention, the electric energy quality control device comprises a transformer substation power supply circuit, a standby power supply circuit, a step-down transformer and a measurement and control module; the electric energy quality control device is provided with a power supply input end and a power supply output end which are used for being connected with a transformer substation; the input end of the transformer substation power circuit is connected with the power input end; the input end of the transformer substation power circuit is connected with the first output end of the measurement and control module, the output end of the transformer substation power circuit is connected with the input end of the measurement and control module, the input end of the standby power circuit is electrically connected with the second output end of the measurement and control module, and the output end of the transformer substation power circuit and the output end of the standby power circuit are both connected with the high-voltage side of the step-down transformer; the low-voltage side of the step-down transformer is connected with the power output end; the transformer substation power circuit comprises a high-frequency zero-crossing circuit and a breaker; the first end of the circuit breaker is connected with the input end of the transformer substation power circuit, and the second end of the circuit breaker is connected with the output end of the transformer substation power circuit; the high-frequency zero-crossing loop is electrically connected to two ends of the circuit breaker in parallel; a first output end of the measurement and control module is respectively connected with a first end of the circuit breaker and an input end of the high-frequency zero-crossing loop; the standby power supply circuit comprises a step-up transformer, a reverse-resistance IGBT circuit and an inversion module; the high-voltage side of the boosting transformer is connected with the output end of the standby power circuit, the low-voltage side of the boosting transformer is connected with the output end of the inversion module, and the input end of the inversion module is connected with the input end of the standby power circuit; the second output end of the measurement and control module is respectively connected with the input ends of the reverse resistance type IGBT circuit and the inversion module; the reverse-resistance type IGBT circuit is arranged on the low-voltage side of the step-up transformer, an effective comprehensive treatment device is provided for regional and large-scale medium-voltage large-capacity electric energy quality, the voltage sag problem of a high-voltage-level power grid can be treated, the circuit breaker is used for conducting during normal operation, no loss is realized, the circuit breaker is matched with a high-frequency zero-crossing loop to isolate a power circuit of a transformer substation when the voltage sag occurs, a standby power circuit is started at the same time, seamless switching of double power supplies is realized, and therefore the operation loss of the device can be effectively improved, and the reaction speed is high; transient overvoltage in a high-frequency zero-crossing loop can be effectively isolated by using the advantage of high insulation level of high-voltage windings of the step-up transformer and the step-down transformer, and the operation risk of the device can be effectively reduced; the reverse-resistance IGBT circuit is utilized to carry out loop short circuit on the secondary side of the booster transformer, the power circuit of the transformer substation can be effectively isolated, and the reverse-resistance IGBT circuit is used for realizing high cut-off speed and bidirectional conduction.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. A power quality management device is characterized by comprising a transformer substation power supply circuit, a standby power supply circuit, a step-down transformer and a measurement and control module; the electric energy quality control device is provided with a power supply input end and a power supply output end which are used for being connected with a transformer substation; the input end of the transformer substation power circuit is connected with the power input end; the input end of the transformer substation power circuit is connected with the first output end of the measurement and control module, the output end of the transformer substation power circuit is connected with the input end of the measurement and control module, the input end of the standby power circuit is electrically connected with the second output end of the measurement and control module, and the output end of the transformer substation power circuit and the output end of the standby power circuit are both connected with the high-voltage side of the step-down transformer; the low-voltage side of the step-down transformer is connected with the power output end;
the transformer substation power circuit comprises a high-frequency zero-crossing circuit and a breaker; the first end of the circuit breaker is connected with the input end of the transformer substation power circuit, and the second end of the circuit breaker is connected with the output end of the transformer substation power circuit; the high-frequency zero-crossing loop is electrically connected to two ends of the circuit breaker in parallel; a first output end of the measurement and control module is respectively connected with a first end of the circuit breaker and an input end of the high-frequency zero-crossing loop;
the standby power supply circuit comprises a step-up transformer, a reverse-resistance IGBT circuit and an inversion module; the high-voltage side of the boosting transformer is connected with the output end of the standby power circuit, the low-voltage side of the boosting transformer is connected with the output end of the inversion module, and the input end of the inversion module is connected with the input end of the standby power circuit; the second output end of the measurement and control module is respectively connected with the input ends of the reverse resistance type IGBT circuit and the inversion module; the reverse-resistance IGBT circuit is arranged on the low-voltage side of the boosting transformer;
the reverse-resistance IGBT circuit comprises a first reverse-resistance IGBT, a second reverse-resistance IGBT and a third reverse-resistance IGBT;
the second end of the second reverse blocking type IGBT is connected with the first end of the third reverse blocking type IGBT, the first end of the first reverse blocking type IGBT is connected with the first end of the second reverse blocking type IGBT, and the second end of the first reverse blocking type IGBT is connected with the second end of the third reverse blocking type IGBT;
the A end of the low-voltage side of the boosting transformer is connected with the first end of the first reverse-resistance type IGBT, the B end of the low-voltage side of the boosting transformer is connected with the second end of the second reverse-resistance type IGBT, and the C end of the low-voltage side of the boosting transformer is connected with the second end of the first reverse-resistance type IGBT.
2. The power quality remediation device of claim 1 wherein the high frequency zero crossing loop comprises a thyristor;
the anode of the thyristor is connected with the input end of the high-frequency zero-crossing loop, the cathode of the thyristor is connected with the output end of the high-frequency zero-crossing loop, and the gate of the thyristor is connected with the first output end of the measurement and control module.
3. The electric energy quality governance device according to claim 2, wherein the high frequency zero crossing loop further comprises a ringing inductor, a first energy storage capacitor and a freewheeling diode;
the first end of the first energy storage capacitor is connected with the cathode of the thyristor, the second end of the first energy storage capacitor is connected with the first end of the oscillation inductor, the second end of the oscillation inductor is connected with the output end of the high-frequency zero-crossing loop, and the freewheeling diode is connected with the two ends of the thyristor in a reverse parallel mode.
4. The power quality management device of claim 2, wherein the substation power circuit further comprises a first isolation switch, a second isolation switch, and a third isolation switch;
the input end of the transformer substation power supply circuit is connected with the first end of the second isolation disconnecting link and the first end of the first isolation disconnecting link, and the second end of the second isolation disconnecting link is connected with the first end of the circuit breaker; the first end of the third isolation disconnecting link is connected with the second end of the circuit breaker, and the output end of the transformer substation power supply circuit is connected with the second end of the third isolation disconnecting link and the second end of the first isolation disconnecting link.
5. The power quality governance device of claim 1 wherein the high frequency zero crossing loop further comprises a piezoresistor;
the first end of the piezoresistor is connected with the input end of the high-frequency zero-crossing loop, and the second end of the piezoresistor is connected with the output end of the high-frequency zero-crossing loop.
6. The power quality management device according to claim 1, wherein the backup power circuit further comprises a second energy storage capacitor, a voltage stabilizing module and an energy storage power supply;
the input end of the inversion module is connected with the first end of the second energy storage capacitor, the second end of the second energy storage capacitor is connected with the output end of the voltage stabilizing module, the input end of the voltage stabilizing module is connected with the output end of the energy storage power supply, and the input end of the energy storage power supply is connected with the input end of the standby power supply circuit.
7. The power quality remediation device of claim 6 wherein the energy storage power source is a flywheel energy storage system, a super capacitor energy storage system or a battery energy storage system.
8. The power quality governance device of claim 1 further comprising a fourth isolation switch;
and the first end of the fourth isolation switch is connected with the power supply input end, and the second end of the fourth isolation switch is connected with the input end of the standby power supply circuit.
9. The power quality remediation device of claim 1 wherein said circuit breaker is a fast repulsion switch.
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| CN102290279A (en) * | 2011-06-30 | 2011-12-21 | 中国人民解放军海军工程大学 | High speed vacuum direct current (DC) current limiting circuit breaker |
| EP3018794B1 (en) * | 2014-11-04 | 2018-01-31 | ABB Schweiz AG | A power supply unit for a self-powered intelligent electronic device |
| CN105826062B (en) * | 2016-05-26 | 2018-01-23 | 北京博瑞莱智能科技集团有限公司 | A kind of loaded capacity regulating voltage regulating switching device and system |
| CN106385043A (en) * | 2016-09-13 | 2017-02-08 | 天津理工大学 | Multiple parallel electric power peak-load shifting device having uninterrupted power source function |
| CN106532657A (en) * | 2016-11-03 | 2017-03-22 | 中国电力科学研究院 | Direct current circuit breaker and circuit breaking method for direct current power transmission system |
| CN109309405A (en) * | 2018-11-29 | 2019-02-05 | 北京国电龙源环保工程有限公司 | Complete high-voltage energy storage power supply unit |
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