CN111525570B - Intelligent power saving device of power distribution and utilization system and control method thereof - Google Patents
Intelligent power saving device of power distribution and utilization system and control method thereof Download PDFInfo
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- CN111525570B CN111525570B CN202010638258.XA CN202010638258A CN111525570B CN 111525570 B CN111525570 B CN 111525570B CN 202010638258 A CN202010638258 A CN 202010638258A CN 111525570 B CN111525570 B CN 111525570B
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
Abstract
The invention discloses an intelligent power saving device of a power distribution and utilization system and a control method thereof, wherein the power saving device comprises a rectification inversion module, a parallel side switch S1, a series side switch S2, a series side coupling transformer T1, a coupling transformer bypass switch S3 and a main circuit bypass switch S4, the rectification inversion module is connected in parallel at the low-voltage side outlet of a main circuit transformer through a parallel side switch S1, the rectification inversion module is connected with a series side coupling transformer T1 through a series side switch S2, a secondary side winding of the series side coupling transformer T1 is connected in series with a main circuit load, a coupling transformer bypass switch S3 is connected in parallel with the series side coupling transformer T1, and the main circuit bypass switch S4 is connected in parallel between a distribution transformer and the main circuit load and is connected in parallel with the main circuit switch and the secondary side winding of the. The control method comprises 4 steps of initialization checking, normal starting, fault self-checking and elimination and normal shutdown.
Description
Technical Field
The invention belongs to the technical field of circuit devices of alternating current distribution networks, and particularly relates to an intelligent power saving device of a power distribution and utilization system and a control method thereof.
Background
In recent years, with the popularization and use of various power electronic devices, the problem of the power quality of a power distribution and utilization system is increasingly obvious, and the power loss generated by the power quality is also increasingly increased. Considering that the electric energy consumption is an important composition cost of enterprise production, the electric energy is saved by optimizing and managing the electric energy quality problem of power distribution and utilization systems of parks and enterprises, and the method becomes an important idea for improving the economic benefit of the enterprises.
According to the literature search discovery in the prior art, the Chinese utility model patent (application number: CN 201820760624.7) provides a power distribution and saving device which is composed of a bypass, a self-coupling step-down transformer, a switching device and other main structures, and solves the problem of instantaneous power failure of the power receiving side in the voltage regulating process of the high-voltage power distribution and saving device. The Chinese utility model patent (application number: CN 201921113928.5) proposes a power saving device composed of main structures such as a motor speed regulation control panel, a three-phase rectification module, an inversion module, a drive plate and a sampling circuit, and solves the problems that the power saving effect of the power saving device in the prior art is not ideal and the output power of a motor can not be intelligently adjusted according to the load. The Chinese utility model patent (application number: CN 201020543020.0) proposes a power saving device which is composed of a rectifier circuit, an inverter module, a drive circuit, a main CPU control unit, a filter circuit, a power frequency bypass circuit, a motor U-shaped curve detection unit, a self-learning correction unit and other main structures, and realizes the harmonic suppression of the power grid.
The structure proposed by the power saving device in the prior document generally has one or all of the following problems: (1) the proposed structure cannot support comprehensive treatment of various power quality problems; (2) the proposed architecture does not take into account protection problems when the main circuit in which the power saving device or the load is located fails.
Aiming at the problems, the invention provides the intelligent power saving device of the power distribution and utilization system and the control method thereof, which can support the treatment function of various power quality problems, fully consider the protection logic of potential faults through switch arrangement, cannot interfere the normal operation of load equipment, can bring considerable power saving benefits for parks and enterprises, and have higher practicability and economical efficiency.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
The invention aims to provide an intelligent power saving device of a power distribution and utilization system and a control method thereof, which can support the treatment function of various power quality problems, can bring considerable power saving benefits for parks and enterprises, and have higher practicability and economy; meanwhile, the switch arrangement of the power saving device fully considers the protection logic of potential faults, and the working circuit can be switched in time when the energy saving device fails, so that the normal power supply of a load by a power grid is recovered, the normal operation of load equipment is not interfered, and the working reliability of the load equipment is ensured.
In order to achieve the purpose, the technical scheme of the invention is as follows: the utility model provides a power distribution and utilization system intelligence power saving device, its includes rectification contravariant module, parallel side switch S1, series side switch S2, series side coupling transformer T1, coupling transformer bypass switch S3 and main circuit bypass switch S4, the rectification contravariant module connects in parallel at main circuit transformer low pressure side exit through parallel side switch S1, the rectification contravariant module links to each other with series side coupling transformer T1 through series side switch S2, series side coupling transformer T1 secondary side winding is established ties with the main circuit load, coupling transformer bypass switch S3 is connected in parallel with series side coupling transformer T1, main circuit bypass switch S4 connects in parallel between distribution transformer' S low pressure side exit and the main circuit load, and is connected in parallel with main circuit switch and series side coupling transformer T1 secondary side winding.
The intelligent power saving device of the power distribution and utilization system is characterized in that the rectification inversion module is formed by sequentially connecting a rectification side filter circuit, a bridge rectifier circuit, a direct current capacitor, an inversion circuit and an inversion side filter circuit.
The control method of the intelligent power saving device of the power distribution and consumption system comprises the following steps: step (1) initializing and checking, if the checking state is good, normally starting the power saving device, executing step (2) and step (3), and if a fault is found, maintaining the shutdown state for maintenance; step (2), starting normally; step (3) when the energy-saving device runs, performing fault self-checking and removing; and (4) after the shutdown instruction is received, normally shutting down the computer.
The control method of the intelligent power saving device of the power distribution and utilization system comprises the following steps of (1) initializing and checking: (1a) disconnecting all switches of the main circuit and the power saving device; (1b) confirming whether the states of a rectification inversion module, a series side coupling transformer T1 and each control switch of the power saving device are good or not; (1c) if the device is in a good state, the normal starting step is continuously executed, and if a fault is found, the shutdown state is maintained for maintenance.
The control method of the intelligent power saving device of the power distribution and utilization system is characterized in that the step (2) of normally starting specifically comprises the following steps: (2a) closing a main circuit bypass switch S4 to realize the power supply of a main circuit load; (2b) closing the parallel side switch S1 and the series side switch S2, and starting the rectification and inversion module; (2c) closing the coupling transformer bypass switch S3, closing the main circuit switch, and opening the main circuit bypass switch S4; (2d) the coupling transformer bypass switch S3 is opened after a delay of 0.5 seconds.
The control method of the intelligent power saving device of the power distribution and utilization system comprises the following steps of (3) fault self-checking and removing: (3a) checking the electric energy parameters of the power saving device loop and the load working main circuit to confirm whether the working states of the power saving device and the load working main circuit are good or not, if the working states are good, keeping the power saving device to work normally, if the power saving device fails, continuing to execute the step (3 b), and if the load working main circuit fails, jumping to the step (3 f); (3b) closing a coupling transformer bypass switch S3 to terminate the output of the series side of the power saving device; (3c) closing a main circuit bypass switch S4 to prevent the load from losing voltage; (3d) disconnecting the main circuit switch; (3e) the power saving device is overhauled, after the overhaul is finished, the power saving device is restarted and operated, and the fault self-checking and elimination are finished; (3f) immediately switching off a main circuit switch; (3g) immediately closing the coupling transformer bypass switch S3 and opening the parallel side switch S1 and the series side switch S2; (3h) and (4) overhauling the main circuit of the load work, restarting and operating the power saving device after the overhauling is finished, and finishing the self-checking and removing of the fault.
The control method of the intelligent power saving device of the power distribution and utilization system comprises the following steps of (4): (4a) closing the transformer bypass switch S3; (4b) closing the main circuit bypass switch S4; (4c) disconnecting the main circuit switch; (4d) all switches of the energy-saving device are turned off.
Has the advantages that: the invention adopts the rectification inversion module with high universality, and introduces the parallel branch and the series winding into the main circuit where the load is positioned respectively, so that the current and the voltage of the main circuit can be regulated according to the requirement of a control strategy, and further the comprehensive treatment of various power quality problems is realized; through reasonable configuration of the switch, the full coverage of the power saving device and the main loop fault protection scheme is realized, and the running safety of the main loop and the power saving device is ensured.
Drawings
Fig. 1 is a basic composition structure diagram of an intelligent power saving device of a power distribution and utilization system disclosed by the invention.
Fig. 2 is a specific operating circuit topology of an intelligent power saving device of a power distribution and utilization system disclosed by the invention.
Fig. 3 is a flow of a control method of an intelligent power saving device of a power distribution and utilization system disclosed by the invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and specific embodiments, and it is to be noted that the embodiments and features of the embodiments of the present application can be combined with each other without conflict.
As shown in fig. 1, the invention discloses an intelligent power saving device for a power distribution and utilization system, which comprises a working circuit and a control switch, wherein the working circuit comprises a rectification inverter module 10 and a series side coupling transformer T1 and is responsible for finishing the optimization and treatment work of power quality; the control switch comprises a parallel side switch S1, a series side switch S2, a coupling transformer bypass switch S3 and a main circuit bypass switch S4, and the control switch is responsible for completing the working state control and the fault protection work of the power saving device. The rectification inversion module 10 is connected in parallel with the low-voltage side outlet of the main circuit distribution transformer 20 through a parallel side switch S1, the rectification inversion module 10 is connected with a series side coupling transformer T1 through a series side switch S2, the secondary side winding of the series side coupling transformer T1 is connected in series with the main circuit load 30, the coupling transformer bypass switch S3 is connected in parallel with a series side coupling transformer T1, and the main circuit bypass switch S4 is connected in parallel between the low-voltage side outlet of the distribution transformer and the main circuit load 30 and connected in parallel with the main circuit switch 40 and the secondary side winding of the series side coupling transformer T1.
As shown in fig. 2, the present invention discloses a specific implementation topology: the rectification inversion module 10 comprises a bridge rectification circuit 1, a direct current capacitor 2, an inversion circuit 3, a rectification side filter circuit 4 and an inversion side filter circuit 5; the coupling transformer bypass switch S3 is a silicon controlled SCR, so that the cost of the device is reduced.
In the intelligent power saving device for the power distribution and utilization system, the main circuit switch 40 is connected between the main circuit transformer 20 and the main circuit load 30.
As shown in fig. 3, the invention discloses a control method of an intelligent power saving device of a power distribution and consumption system, which comprises the following steps: step (1) initializing and checking, if the checking state is good, normally starting the power saving device, executing step (2) and step (3), and if a fault is found, maintaining the shutdown state for maintenance; step (2), starting normally; step (3) when the energy-saving device runs, performing fault self-checking and removing; and (4) after the shutdown instruction is received, normally shutting down the computer.
The control method of the intelligent power saving device of the power distribution and utilization system comprises the following steps of (1) initializing and checking: (1a) disconnecting all switches of the main circuit and the power saving device; (1b) confirming whether the states of a rectification inversion module, a series side coupling transformer T1 and each control switch of the power saving device are good or not; (1c) if the device is in a good state, the normal starting step is continuously executed, and if a fault is found, the shutdown state is maintained for maintenance.
The control method of the intelligent power saving device of the power distribution and utilization system is characterized in that the step (2) of normally starting specifically comprises the following steps: (2a) closing a main circuit bypass switch S4 to realize the power supply of a main circuit load; (2b) closing the parallel side switch S1 and the series side switch S2, and starting the rectification and inversion module; (2c) closing the coupling transformer bypass switch S3, closing the main circuit switch, and opening the main circuit bypass switch S4; (2d) the coupling transformer bypass switch S3 is opened after a delay of 0.5 seconds.
The control method of the intelligent power saving device of the power distribution and utilization system comprises the following steps of (3) fault self-checking and removing: (3a) checking the electric energy parameters of the power saving device loop and the load working main circuit to confirm whether the working states of the power saving device and the load working main circuit are good or not, if the working states are good, keeping the power saving device to work normally, if the power saving device fails, continuing to execute the step (3 b), and if the load working main circuit fails, jumping to the step (3 f); (3b) closing a coupling transformer bypass switch S3 to terminate the output of the series side of the power saving device; (3c) closing a main circuit bypass switch S4 to prevent the load from losing voltage; (3d) disconnecting the main circuit switch; (3e) the power saving device is overhauled, after the overhaul is finished, the power saving device is restarted and operated, and the fault self-checking and elimination are finished; (3f) immediately switching off a main circuit switch; (3g) immediately closing the coupling transformer bypass switch S3 and opening the parallel side switch S1 and the series side switch S2; (3h) and (4) overhauling the main circuit of the load work, restarting and operating the power saving device after the overhauling is finished, and finishing the self-checking and removing of the fault.
The control method of the intelligent power saving device of the power distribution and utilization system comprises the following steps of (4): (4a) closing the transformer bypass switch S3; (4b) closing the main circuit bypass switch S4; (4c) disconnecting the main circuit switch; (4d) all switches of the energy-saving device are turned off.
Based on the basic structure shown in fig. 1, when the power saving device is normally started, the following steps should be sequentially executed: (A1) all switches of the main circuit and the power saving device are disconnected to confirm that the power saving device has good function; (A2) closing a main circuit bypass switch S4 to realize the power supply of a main circuit load; (A3) closing the parallel side switch S1 and the series side switch S2, and starting the rectification and inversion module; (A4) closing the coupling transformer bypass switch S3, closing the main circuit switch, and opening the main circuit bypass switch S4; (A5) the coupling transformer bypass switch S3 is opened after a delay of 0.5 seconds. As a specific topology shown in fig. 2, after the rectifying and inverting module is started in step (a 2), an output voltage of about 10V should be set on the inverting side to satisfy the conduction condition of the SCR, and then the process goes to step (a 4).
Based on the basic structure shown in fig. 1, when the power saving device is normally shut down, the following steps should be sequentially executed: (B1) closing the transformer bypass switch S3; (B2) closing the main circuit bypass switch S4; (B3) disconnecting the main circuit switch; (B4) all switches of the energy-saving device are turned off. For a specific topology shown in fig. 2, when the inverter power supply receives a shutdown instruction, the inverter power supply should output a small voltage to ensure that the SCR meets the conduction condition, and ensure that the SCR is conducted by the SCR driving signal, after the SCR switch is determined to be conducted, the main circuit bypass switch is closed, the main circuit switch is opened, and at this time, because there is no pressure difference between the two ends of the SCR, the transformer bypass is automatically opened.
Based on the basic structure shown in fig. 1, when the power saving device fails, the following steps should be sequentially performed: (C1) closing a coupling transformer bypass switch S3 to terminate the output of the series side of the power saving device; (C2) closing a main circuit bypass switch S4 to prevent the load from losing voltage; (C3) the main circuit switch is opened. For a specific topology shown in fig. 2, when the inverter power supply has abnormal protection, the inverter power supply should apply an SCR driving signal to ensure that the SCR switch is turned on, and then step (C2) is performed.
Based on the basic structure shown in fig. 1, when the power saving device operates normally and the main circuit fails, the following steps should be sequentially performed: (D1) immediately switching off a main circuit switch; (D2) the coupling transformer bypass switch S3 is closed immediately, and the parallel side switch S1 and the series side switch S2 are opened, so that the fault current and voltage are prevented from damaging the rectification inverter module due to the fault or insufficient quick action of the main circuit switch.
The invention adopts the rectification inversion module with high universality, and introduces the parallel branch and the series winding into the main circuit where the load is positioned respectively, so that the current and the voltage of the main circuit can be regulated according to the requirement of a control strategy, and further the comprehensive treatment of various power quality problems is realized; through reasonable configuration of the switch, the full coverage of the power saving device and the main loop fault protection scheme is realized, and the running safety of the main loop and the power saving device is ensured.
In addition, the invention is suitable for the electric energy quality control and the electricity-saving optimization transformation of a single-phase power distribution and utilization system, and the equipment and the method are suitable for a three-phase circuit and a single-phase circuit.
In conclusion, although the present invention has been described with reference to the preferred embodiments, it should be noted that, although various changes and modifications may be made by those skilled in the art, they should be included in the scope of the present invention unless they depart from the scope of the present invention.
Claims (5)
1. A control method of an intelligent power saving device of a power distribution and utilization system comprises a rectification inverter module, a parallel side switch S1, a series side switch S2, a series side coupling transformer T1, a coupling transformer bypass switch S3 and a main circuit bypass switch S4, the rectification inversion module is connected in parallel with the low-voltage side outlet of the main circuit distribution transformer through a parallel side switch S1, the rectification inversion module is connected with the series side coupling transformer T1 through a series side switch S2, the secondary side winding of the series side coupling transformer T1 is connected in series with the main circuit load, the coupling transformer bypass switch S3 is connected in parallel with the series side coupling transformer T1, the main circuit bypass switch S4 is connected in parallel between the low-voltage side outlet of the distribution transformer and the main circuit load, and is connected in parallel with the main circuit switch and the secondary side winding of the series side coupling transformer T1; the method is characterized by comprising the following steps: step (1) initializing and checking, if the checking state is good, normally starting the power saving device, executing step (2) and step (3), and if a fault is found, maintaining the shutdown state for maintenance; step (2), starting normally; step (3) when the energy-saving device runs, performing fault self-checking and removing; step (4) after receiving a shutdown instruction, normally shutting down the computer; the normal starting in the step (2) specifically comprises the following steps: (2a) closing a main circuit bypass switch S4 to realize the power supply of a main circuit load; (2b) closing the parallel side switch S1 and the series side switch S2, and starting the rectification and inversion module; (2c) closing the coupling transformer bypass switch S3, closing the main circuit switch, and opening the main circuit bypass switch S4; (2d) the coupling transformer bypass switch S3 is opened after a delay of 0.5 seconds.
2. The control method of the intelligent power saving device of the power distribution and utilization system as claimed in claim 1, wherein the rectification inverter module is formed by sequentially connecting a rectification side filter circuit, a bridge rectifier circuit, a direct current capacitor, an inverter circuit and an inverter side filter circuit.
3. The control method for the intelligent power saving device of the power distribution and utilization system as claimed in claim 1, wherein the step (1) of initializing the check specifically comprises the steps of: (1a) disconnecting all switches of the main circuit and the power saving device; (1b) confirming whether the states of a rectification inversion module, a series side coupling transformer T1 and each control switch of the power saving device are good or not; (1c) if the device is in a good state, the normal starting step is continuously executed, and if a fault is found, the shutdown state is maintained for maintenance.
4. The control method for the intelligent power saving device of the power distribution and utilization system as claimed in claim 1, wherein the step (3) of fault self-checking and removing specifically comprises the following steps: (3a) checking the electric energy parameters of the power saving device loop and the load working main circuit to confirm whether the working states of the power saving device and the load working main circuit are good or not, if the working states are good, keeping the power saving device to work normally, if the power saving device fails, continuing to execute the step (3 b), and if the load working main circuit fails, jumping to the step (3 f); (3b) closing a coupling transformer bypass switch S3 to terminate the output of the series side of the power saving device; (3c) closing a main circuit bypass switch S4 to prevent the load from losing voltage; (3d) disconnecting the main circuit switch; (3e) the power saving device is overhauled, after the overhaul is finished, the power saving device is restarted and operated, and the fault self-checking and elimination are finished; (3f) immediately switching off a main circuit switch; (3g) immediately closing the coupling transformer bypass switch S3 and opening the parallel side switch S1 and the series side switch S2; (3h) and (4) overhauling the main circuit of the load work, restarting and operating the power saving device after the overhauling is finished, and finishing the self-checking and removing of the fault.
5. The control method for the intelligent power saving device of the power distribution and utilization system as claimed in claim 1, wherein the step (4) of normally shutting down the power distribution and utilization system specifically comprises the following steps: (4a) closing the transformer bypass switch S3; (4b) closing the main circuit bypass switch S4; (4c) disconnecting the main circuit switch; (4d) all switches of the energy-saving device are turned off.
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| CN202010638258.XA CN111525570B (en) | 2020-07-06 | 2020-07-06 | Intelligent power saving device of power distribution and utilization system and control method thereof |
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| CN202010638258.XA CN111525570B (en) | 2020-07-06 | 2020-07-06 | Intelligent power saving device of power distribution and utilization system and control method thereof |
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| JP6363391B2 (en) * | 2014-05-16 | 2018-07-25 | 株式会社東芝 | Voltage regulator |
| EP3381101A4 (en) * | 2015-11-24 | 2019-06-26 | The Powerwise Group, Inc. | A unified power flow controller utilizing energy saving devices at a point of power consumption |
| CN106972505B (en) * | 2017-05-05 | 2023-09-22 | 贵州电网有限责任公司电力科学研究院 | Mixed power electronic transformer for unified power quality control and control method thereof |
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