CN109193669B - Intelligent load distribution adjusting device for power distribution network - Google Patents
Intelligent load distribution adjusting device for power distribution network Download PDFInfo
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- CN109193669B CN109193669B CN201811392158.2A CN201811392158A CN109193669B CN 109193669 B CN109193669 B CN 109193669B CN 201811392158 A CN201811392158 A CN 201811392158A CN 109193669 B CN109193669 B CN 109193669B
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Classifications
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- 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
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The utility model discloses an intelligent load distribution adjusting device for a power distribution network, which is applied to a distribution transformer low-voltage side of a low-voltage distribution transformer area. The background system calculates a corresponding load switching strategy by collecting the installed distribution transformer load data and sends the corresponding load switching strategy to the device through a communication network, and the device switches the selected load to a proper phase, so that the load of the low-voltage side of the distribution transformer is basically kept in a balanced state, and the purposes of reducing line loss and transformer loss, prolonging the service life of the transformer, improving the power supply quality and the like are achieved.
Description
Technical Field
The utility model relates to the technical field of power distribution networks, in particular to an intelligent load distribution adjusting device for a power distribution network.
Background
The low-voltage distribution network in China supplies power to users through a 10kV/O.4kV transformer in a three-phase four-wire system, and is a power supply network for mixing three-phase production power and single-phase load power. Because the low-voltage distribution network in China has wide coverage area and different running environments, a large number of power users are scattered, a large number of single-phase loads with unbalanced space-time distribution exist, even if the three-phase loads are evenly distributed on A, B, C three phases, the power utilization habit difference of residents and the randomness of the loads are strong, the large three-phase unbalance can be caused, and the three-phase unbalance phenomenon is managed and managed with time and labor waste. The failure to distribute the electrical load evenly across the phases is a major cause of three-phase imbalance problems.
If the power grid runs for a long time under the condition of serious three-phase unbalance, adverse effects are generated on both power supply and power utilization. The impact of three-phase load imbalance on a distribution block mainly includes 4 aspects: 1) Causing increased distribution transformer and line losses; 2) The quality of the power supply voltage of the heavy load phase in the distribution area is greatly reduced; 3) The output of the distribution transformer is reduced, and the electric energy conversion efficiency is reduced; 4) The unbalanced operation of the three-phase load causes the zero sequence current of the distribution transformer to be increased, and the caused eddy current loss causes the operation temperature of the distribution transformer to be increased, so that the safety and the service life of the distribution transformer are endangered.
Therefore, reducing the three-phase load unbalance of the distribution area and improving the economic operation level and the quality of the power supply voltage of the distribution area are the problems to be solved urgently.
In order to solve the problems, the load management is enhanced, and the load on each phase of the low-voltage line is balanced and distributed by manually adjusting the phase sequence of the load in an off-line mode. The operation and maintenance personnel of the power supply department manually measure the three-phase current value at a certain moment, and the three-phase unbalance condition of the power utilization area is determined through analysis and calculation. In order to accurately determine the three-phase unbalance condition of each power utilization area, a worker needs to track and research each distribution transformer area for a long time, collect transformer outlet data, count various power utilization loads, and finally determine a reasonable phase change scheme through a large amount of data calculation and a user load curve. Although the scheme can reduce the severity of the three-phase load unbalance of the distribution transformer area to a certain extent, due to the randomness and uncertainty of the power consumption load, the power consumption load cannot be regulated on line in real time according to the actual load unbalance condition by means of manpower, the power supply reliability of users is inevitably affected, and potential safety hazards exist to a certain extent.
In order to solve the above problems, chinese patent grant publication No. (CN 207638340U) provides an automatic adjusting device for three-phase load imbalance, which includes a three-phase voltage acquisition unit, a three-phase current acquisition unit, a control unit, a driving unit, and a current compensation unit; the three-phase voltage acquisition unit is used for acquiring bus voltage signals of the bus outgoing side of the distribution transformer and transmitting the bus voltage signals to the control unit; the three-phase current acquisition unit is used for acquiring load current signals and transmitting the load current signals to the control unit; the control unit processes the bus voltage signal and the load current signal and sends the processed bus voltage signal and the processed load current signal to the driving unit; the driving unit controls the current compensation unit to generate compensation current; the current compensation unit adopts a three-level IGBT unit; and the three-level IGBT unit transmits the compensation current to the power transmission line of the distribution transformer through the LCL filter unit. The utility model has the advantages of scientific design, strong compatibility, good stability, high power transmission efficiency and low production cost. The utility model needs to add a compensation device, has higher cost, difficult control and low reliability, and mainly aims at large power consumption load.
Chinese patent grant publication number (CN 206195358U) discloses an automatic regulator for unbalanced load of three phases, the controller is connected with a sampling circuit unit, the sampling end of the sampling circuit unit is connected with a bus of three-phase power, the power interface of the controller is connected with the bus of three-phase power through a power supply line, the control interface of the controller is connected with a silicon controlled rectifier unit, and each reactive compensation component is connected back to the bus of three-phase power. The three-phase load unbalance automatic regulating device of the utility model, the dynamic switching unit adopts the silicon controlled rectifier as the core to switch on the capacitor bank through the zero crossing detection control of voltage and current, thus avoiding the generation of switching-on surge current, cutting off the capacitor bank when the current crosses zero, avoiding the occurrence of transient overvoltage, meeting the requirement of zero crossing switching of the capacitor, and in addition, because the triggering frequency of the silicon controlled rectifier is not limited, the utility model can realize quasi-dynamic compensation, and effectively solve the technical problems of large surge current, large switching spark, large vibration, noise and the like of the switching switch of the original alternating current contactor. However, the device has the problems of high electric energy loss, large equipment volume, inaccurate adjustment and low reliability.
Disclosure of Invention
Aiming at the prior art, the utility model aims to provide the intelligent load distribution adjusting device for the power distribution network, which is used for solving the problems of low power supply reliability, high electric energy loss, unqualified electric energy quality and unsafe equipment.
In order to achieve the above purpose, the utility model adopts the following technical scheme: an intelligent load distribution regulating device for a power distribution network, the device is arranged on the low-voltage side of a distribution transformer in a distribution area, namely between the low-voltage distribution transformer and a user load, and comprises: a switching unit for performing load switching and a control unit for controlling the switching; the switch unit comprises 3 basic switch modules which respectively correspond to A, B, C three phases, and each basic switch module is connected with a single-phase output phase; the control unit comprises a communication module, an embedded controller, an input voltage detection module, a load current detection module and an IGBT driving module, wherein the embedded controller is electrically connected with the communication module, the input voltage detection module, the load current detection module and the IGBT driving module respectively; the input voltage detection module is connected with A, B, C three-phase input, the load current detection module is electrically connected with the single-phase output, and the IGBT driving module is electrically connected with the basic switch module; the control unit opens one basic switch module of the A, B, C three phases according to the load switching instruction provided by the communication module, and connects the phase where the basic switch module is positioned with the single-phase output to realize load switching.
Further, the basic switch module comprises a magnetic latching relay and a power electronic switch, and the basic switch module controls the magnetic latching relay and the power electronic switch of A, B, C three phases through a control signal of a driving circuit for controlling the magnetic latching relay and a trigger pulse signal of a power electronic device.
Further, the intelligent load distribution adjusting device of the power distribution network can be set to a zero-voltage switching mode and a zero-current switching mode, and when the device is set to the zero-voltage switching mode, switching is selected when the voltages of the current phase and the target phase are equal; when the device is set to a zero current switching mode, switching is selected when the load current is zero.
Further, the basic switch module comprises four diodes D1, D2, D3 and D4 and an IGBT device S, the basic switch module is configured as a bidirectional on-module and an off-module, and when the phase voltage is in a positive half cycle or a negative half cycle, the phase input and the phase output are both communicated; when the IGBT device S is turned off, the phase voltage is in the positive half cycle or the negative half cycle, and the phase input and output are disconnected.
Further, the communication module is used for receiving a background load switching instruction and sending the running state of the device to the background, and the embedded controller performs load switching according to the current input voltage and the load state after receiving the background instruction.
Further, the embedded controller is used for processing data of the communication module, collecting input voltage and load current of the system, and controlling on/off of each basic switch module through the IGBT driving module.
Further, the input voltage detection module is used for detecting three-phase input voltages, so that the device can select an optimal switching point in a zero-voltage switching mode.
Further, the load current detection module is configured to detect a load current and send the load current to the background through the communication module, where the load current detection module selects an optimal switching point when in a zero current switching mode.
Further, the IGBT driving module provides power amplification and signal isolation functions, and the basic switch module can be turned on and off after the on and off signals of the controller are amplified in power.
The beneficial effect of this device is:
(1) According to the intelligent load distribution regulating device of the power distribution network based on the power electronic technology, all terminals are controlled to be switched to proper phases through a system host, so that the load of the low-voltage side of the distribution transformer is basically kept in a balanced state.
(2) The basic switch module of the switch unit adopts a low-voltage composite switch design mode, fully integrates the advantages of 2 devices of the magnetic latching relay and the power electronic switch, intelligently balances three-phase load, does not lose power in the phase change process, and has obvious energy-saving and damage-reducing effects.
(3) The volume of the device is greatly reduced, and the cost investment is greatly reduced.
(4) The device has the advantages that the operation process is uninterrupted, the phase sequence adjustment of the power consumption load under the condition of load can be realized, meanwhile, the seamless switching is realized through the operation, and no surge can be ensured during the switching on period of the switch, so that no impact is caused to a low-voltage power grid and the load, the requirements on linearity and no impact are met, and the power supply reliability and the voltage quality are ensured.
In conclusion, the popularization of the device greatly improves the operation stability and the intellectualization of the distribution network, can well support the requirements of the intelligent power grid proposed by the national network company, improves the power factor of a power supply and utilization system and a load, reduces the equipment capacity and reduces the investment; the loss of the circuit and the transformer is reduced, and the active transmission capacity of the power grid, the output of the transformer and the running economic benefit are improved; the voltage distribution characteristic along the line is improved, and the power supply quality of the power grid is improved; the heating of power network equipment is reduced, and the service life is prolonged; the system stability is improved, voltage breakdown and stable damage accidents are avoided, and the safe operation of the system is improved. The device switches the selected load to a proper phase, so that the load on the low-voltage side of the distribution transformer is basically kept in a balanced state, thereby achieving the purposes of reducing line loss and transformer loss, prolonging the service life of the transformer, improving the power supply quality and the like. The communication module is used for receiving a background load switching instruction and sending the running state of the device to the background, and the embedded controller performs load switching according to the current input voltage and the load state after receiving the background instruction. The embedded controller is used for processing data of the communication module, collecting input voltage and load current of the system and controlling on-off of each basic switch module through the IGBT driving module. The input voltage detection module is used for detecting three-phase input voltages, and the device is used for selecting an optimal switching point in a zero-voltage switching mode. The load current detection module is used for detecting load current and sending the load current to the background through the communication module, and the load current detection module selects an optimal switching point in a zero-current switching mode. The IGBT driving module provides power amplification and signal isolation functions, and can turn on and off an IGBT device after amplifying the on and off signal power of the controller.
Drawings
Fig. 1 is a schematic diagram of an intelligent load distribution regulator for a power distribution network according to the present utility model;
FIG. 2 is a schematic diagram of a switch unit according to the present utility model;
FIG. 3 is a schematic diagram of a basic switch module according to the present utility model;
FIG. 4 is a schematic diagram of the control unit of the present utility model;
fig. 5 is a system block diagram of an intelligent load distribution regulating device for a power distribution network.
Detailed Description
Specific embodiments of the present utility model are further described below with reference to the accompanying drawings:
example 1
As shown in fig. 1, 2, 4 and 5: an intelligent load distribution regulating device for a power distribution network, the device is arranged on the low-voltage side of a distribution transformer in a distribution area, namely between the low-voltage distribution transformer and a user load, and comprises: a switching unit for performing load switching and a control unit for controlling the switching; the switch unit comprises 3 basic switch modules which respectively correspond to A, B, C three phases, and each basic switch module is connected with a single-phase output phase; the control unit comprises a communication module, an embedded controller, an input voltage detection module, a load current detection module and an IGBT driving module, wherein the embedded controller is electrically connected with the communication module, the input voltage detection module, the load current detection module and the IGBT driving module respectively; the input voltage detection module is connected with A, B, C three-phase input, the load current detection module is electrically connected with the single-phase output, and the IGBT driving module is electrically connected with the basic switch module; the control unit opens one basic switch module of the A, B, C three phases according to the load switching instruction provided by the communication module, and connects the phase where the basic switch module is positioned with the single-phase output to realize load switching. The background system calculates a corresponding load switching strategy by collecting the installed distribution transformer load data and sends the corresponding load switching strategy to the device through a communication network, and the device switches the selected load to a proper phase, so that the load of the low-voltage side of the distribution transformer is basically kept in a balanced state, and the purposes of reducing line loss and transformer loss, prolonging the service life of the transformer, improving the power supply quality and the like are achieved.
The communication module is used for receiving a background load switching instruction and sending the running state of the device to the background, and the embedded controller performs load switching according to the current input voltage and the load state after receiving the background instruction.
The embedded controller is used for processing data of the communication module, collecting input voltage and load current of the system and controlling on-off of each basic switch module through the IGBT driving module.
The input voltage detection module is used for detecting three-phase input voltages, and the device is used for selecting an optimal switching point in a zero-voltage switching mode.
The load current detection module is used for detecting load current and sending the load current to the background through the communication module, and the load current detection module selects an optimal switching point in a zero-current switching mode.
The IGBT driving module provides power amplification and signal isolation functions, and can turn on and off an IGBT device after amplifying the on and off signal power of the controller.
The switching process is as follows, firstly, the IGBT of the current phase is turned off, and after a dead time period, the IGBT of the target phase is turned on.
The control unit is a core component for real-time on-line management of three-phase load unbalance of the distribution area. The three-phase current unbalance condition of the outlet of the low-voltage side of the distribution transformer can be monitored in real time, related constraint conditions are judged according to the three-phase current unbalance degree limit value, and phase change decision is executed when the set conditions are met; then, according to three-phase current of an outlet of the low-voltage side of the distribution transformer and current and phase sequence data of each load branch of each low-voltage load on-line automatic phase-change device, which are acquired in real time, carrying out optimization calculation through a genetic optimization algorithm to obtain an optimal phase-change instruction of each low-voltage load on-line automatic phase-change device; and finally, the switch of each low-voltage load on-line automatic phase-change device reliably opens and closes according to the control instruction, and the switching of each load branch between different phase sequences is completed under the condition that power failure is not required.
Example two
As shown in fig. 3 and 5, the basic switch module includes a magnetic latching relay and a power electronic switch, and controls the magnetic latching relay and the power electronic switch of A, B, C three phases through a control signal of a driving circuit controlling the magnetic latching relay and a trigger pulse signal of a power electronic device. The basic switch module comprises four diodes D1, D2, D3 and D4 and an IGBT device S, the basic switch module is arranged as a bidirectional on-module and an off-module, the IGBT device S is turned on, and when the phase voltage is in a positive half cycle or a negative half cycle, the phase input and the phase output are communicated; when the IGBT device S is turned off, the phase voltage is in the positive half cycle or the negative half cycle, and the phase input and output are disconnected.
The switch unit adopts a low-voltage compound switch design mode, and fully integrates the advantages of 2 devices of the magnetic latching relay and the power electronic switch. Each composite switch unit comprises 3 single-phase composite switches, and corresponds to A, B, C three phases respectively. Each single-phase compound switch comprises a magnetic latching relay and a power electronic switch, and the magnetic latching relay and the power electronic switch of each phase can be independently controlled by a control signal of the magnetic latching relay and a trigger pulse signal of a power electronic device controlled by a driving circuit, so that the load branch can be switched between A, B, C three phases freely, and the controllability requirement is met. For any load branch, only one magnetic latching relay on one phase is in a closed state during normal operation, and the magnetic latching relays on the other two phases are in an open state; the power electronic switches on the three phases are all in an off state. When the load is in phase change, if the load on one load branch is changed from the A phase to the B phase, firstly, the A phase power electronic switch is conducted, and after the A phase power electronic switch is conducted, the magnetic latching relay on the A phase is disconnected; then commutating the load current from the A phase to the B phase by controlling the power electronic switch; and then closing the magnetic latching relay on the B phase, and turning off the power electronic switch on the B phase after the magnetic latching relay on the B phase is closed. The load was adjusted between the remaining phases of A, B, C three phases similarly to the above. The operation process has no power failure, can realize the phase sequence adjustment of the power consumption load under the condition of load, and simultaneously realizes seamless switching, and can ensure no surge during the switching on period of the switch, thereby having no impact on a low-voltage power grid and load, meeting the requirements on linearity and no impact, and ensuring the power supply reliability and voltage quality. The magnetic latching relay is in a closed state during normal operation, a current channel is provided, the resistance of the magnetic latching relay is small, and no loss is caused basically; the power electronic switch provides a current channel during phase change, so that the on-state loss is small; therefore, the low-voltage load basically has no electric energy loss during the working period of the on-line automatic phase-change device, and meets the requirement of no damage.
Example III
The intelligent load distribution regulating device of the power distribution network is set to be in a zero-voltage switching mode and a zero-current switching mode, and when the device is set to be in the zero-voltage switching mode, switching is selected when the voltages of the current phase and the target phase are equal; when the device is set to a zero current switching mode, switching is selected when the load current is zero.
Finally, it is noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present utility model, and that other modifications and equivalents thereof by those skilled in the art should be included in the scope of the claims of the present utility model without departing from the spirit and scope of the technical solution of the present utility model.
Claims (4)
1. An intelligent load distribution adjusting device of a power distribution network, which is characterized in that: the device sets up in the low-voltage side of distribution transformer in distribution transformer district, is between low-voltage distribution transformer and user's load promptly, includes: a switching unit for performing load switching and a control unit for controlling the switching unit;
the switch unit comprises 3 basic switch modules which respectively correspond to A, B, C three phases, and each basic switch module is connected with a single-phase output phase;
the control unit comprises a communication module, an embedded controller, an input voltage detection module, a load current detection module and an IGBT driving module, wherein the embedded controller is electrically connected with the communication module, the input voltage detection module, the load current detection module and the IGBT driving module respectively; the input voltage detection module is connected with A, B, C three-phase input, the load current detection module is electrically connected with the single-phase output, and the IGBT driving module is electrically connected with the basic switch module;
the control unit opens one basic switch module of the A, B, C three phases according to the load switching instruction provided by the communication module, and connects the phase where the basic switch module is positioned with the single-phase output to realize load switching;
the intelligent load distribution regulating device of the power distribution network can be set to a zero-voltage switching mode and a zero-current switching mode, and when the device is set to the zero-voltage switching mode, switching is selected when the voltages of the current phase and the target phase are equal; when the device is set to a zero current switching mode, switching is selected when the load current is zero;
the embedded controller is used for processing data of the communication module, collecting input voltage and load current of the system and controlling the on-off of the basic switch module through the IGBT driving module;
the input voltage detection module is used for detecting three-phase input voltages, and the device selects an optimal switching point in a zero-voltage switching mode;
the load current detection module is used for detecting load current and sending the load current to the background through the communication module, and the load current detection module selects optimal switching in a zero current switching mode;
the IGBT driving module provides power amplification and signal isolation functions, and the basic switch module can be turned on and off after the on and off signals of the controller are amplified in power.
2. The intelligent load distribution regulating device for the power distribution network according to claim 1, wherein the basic switch module comprises a magnetic latching relay and a power electronic switch, and the basic switch module controls the magnetic latching relay and the power electronic switch of A, B, C three phases through a control signal of a driving circuit for controlling the magnetic latching relay and a trigger pulse signal of a power electronic device.
3. The intelligent load distribution regulating device for a power distribution network according to claim 1 or 2, wherein the basic switch module comprises four diodes D1, D2, D3, D4 and an IGBT device S, the basic switch module is configured as a bidirectional on-module and an off-module, and when the corresponding phase voltage is in a positive half cycle or a negative half cycle, the corresponding phase input and output are communicated; when the IGBT device S is turned off and the corresponding phase voltage is in the positive half cycle or the negative half cycle, the phase input and output are disconnected.
4. The intelligent load distribution regulating device for a power distribution network according to claim 1, wherein: the communication module is used for receiving a background load switching instruction and sending the running state of the intelligent load distribution regulating device of the power distribution network to the background, and the embedded controller performs load switching according to the current input voltage and the load state after receiving the background instruction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811392158.2A CN109193669B (en) | 2018-11-21 | 2018-11-21 | Intelligent load distribution adjusting device for power distribution network |
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| CN201811392158.2A CN109193669B (en) | 2018-11-21 | 2018-11-21 | Intelligent load distribution adjusting device for power distribution network |
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| CN109193669A CN109193669A (en) | 2019-01-11 |
| CN109193669B true CN109193669B (en) | 2023-12-19 |
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