A power distribution circuit for comprehensive treatment of power quality

Abstract

The utility model discloses a kind of power distribution circuit of power quality comprehensive treatment, comprising: incoming line unit, metering unit, intelligent fusion terminal, outgoing line unit and power quality comprehensive treatment unit, incoming line unit is divided into two branches, one is electrically connected to intelligent fusion terminal, another is sequentially electrically connected metering unit and power quality comprehensive treatment unit, power quality comprehensive treatment unit is electrically connected to outgoing line unit;The power quality comprehensive treatment unit includes transformer, reactive power compensation unit, series side power unit and shunt side power unit, the input side of series side power unit is electrically connected to the output end of transformer, series side power unit and shunt side power unit are in series;The present application is by dynamic voltage stabilizing, reactive current compensation and three-phase unbalance comprehensive treatment, significantly improve voltage stability, ensure load side power supply safety, effectively reduce line loss and transformer overload risk.

Description

Technical Field

[0001] This utility model belongs to the field of power equipment technology, and specifically relates to a power distribution circuit for comprehensive power quality management. Background Technology

[0002] The circuit structure in the power grid is basically a typical three-phase four-wire system, which is highly susceptible to surges in single-phase loads. Uncontrollable capacity increases for single-phase users, the connection of high-power single-phase loads, and the asynchronous nature of single-phase load consumption all easily lead to severe load imbalances. Simultaneously, harmonics and reactive currents caused by nonlinear loads in the system further exacerbate the problem. Over time, this will increase transformer losses, affecting output and potentially even causing transformer burnout. The safe operation of many power supply and consumer equipment will be compromised, resulting in economic losses for power supply companies and threatening the lives and property of users to a certain extent.

[0003] Therefore, the problems of three-phase imbalance, harmonics, and reactive power in the power distribution network urgently need to be solved. Utility Model Content

[0004] This utility model aims to solve the technical problems mentioned in the background, overcome the shortcomings of the prior art, and provide a power distribution circuit for comprehensive power quality management. This utility model solves the power quality problems of three-phase load imbalance, harmonics, and low power factor.

[0005] The technical solution adopted by this utility model to solve its existing problems is:

[0006] A power distribution circuit for comprehensive power quality management includes: an incoming line unit, a metering unit, an intelligent fusion terminal, an outgoing line unit, and a power quality comprehensive management unit. The incoming line unit is divided into two branches, one of which is electrically connected to the intelligent fusion terminal, and the other is electrically connected to the metering unit and the power quality comprehensive management unit in sequence. The power quality comprehensive management unit is electrically connected to the outgoing line unit.

[0007] The power quality management unit includes a transformer, a reactive power compensation unit, a series-side power unit, and a parallel-side power unit. The input side of the series-side power unit is electrically connected to the output end of the transformer. The series-side power unit is connected in series with the parallel-side power unit, and the other end of the parallel-side power unit is electrically connected to the input end of the transformer.

[0008] Preferably, the series-side power unit is specifically an AC-DC rectifier power unit, and the parallel-side power unit is specifically a DC-AC inverter power unit.

[0009] Preferably, the power quality management unit is specifically configured such that the output side of the transformer is electrically connected in sequence to the disconnecting switch QS1, the DC-AC inverter power unit, the AC-DC rectifier power unit, and the fifth circuit breaker QF5 to the input side of the transformer. The output side of the disconnecting switch QS1 is also electrically connected to a power electronic voltage regulating bypass module.

[0010] Preferably, the reactive power compensation unit includes a fourth circuit breaker QF4, a surge arrester F, a common compensation capacitor 1C, and a separate compensation capacitor 2C. Specifically, the reactive power compensation unit is electrically connected to the fourth circuit breaker QF4 on the other side of the transformer input terminal. The output terminal of the fourth circuit breaker QF4 is divided into two branches. One branch is electrically connected to the surge arrester F, which is connected to the ground terminal. The other branch is electrically connected to the common compensation capacitor 1C and the separate compensation capacitor 2C, which are connected in parallel.

[0011] Preferably, the metering unit is specifically a concentrator, an energy meter, and a first current transformer group 1TA connected in series and connected to the incoming line side.

[0012] Preferably, the metering unit is electrically connected to the second current transformer group 2TA, which is further divided into two branches. One branch connects to the fuse FU and the surge protector SPD in sequence and is connected to the grounding terminal. The other branch connects to the power quality management unit.

[0013] Preferably, the series-side power unit and the parallel-side power unit are connected via a ribbon cable for RS-485 communication, the common compensation capacitor IC is connected to the series-side power unit via a ribbon cable for RS-485 communication, and the series-side power unit is connected to the intelligent fusion terminal via a ribbon cable for RS-485 communication.

[0014] Preferably, the power quality comprehensive management unit is further provided with an emergency stop control module, a handover control module, and a cooling fan module.

[0015] Preferably, the cooling fan module is electrically connected to the power electronic voltage regulating module, and the emergency stop control module and the handover control module are electrically connected to the DC-AC inverter power unit.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] Through dynamic voltage stabilization, reactive current compensation, and comprehensive management of three-phase imbalance, voltage stability is significantly improved, ensuring power supply safety on the load side and effectively reducing line losses and transformer overload risks. Its refined reactive power compensation technology, combined with intelligent capacitor banks, tracks load demand in real time, optimizes the power factor of the power grid, reduces energy waste, and extends the service life of power distribution equipment. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the overall structure of a power distribution circuit for comprehensive power quality management according to this utility model.

[0020] Figure 2 This is a partial circuit diagram of the power quality comprehensive management unit in a power distribution circuit according to the present invention.

[0021] Figure 3 This utility model presents a power distribution circuit for comprehensive power quality management, including a power quality management unit with parallel and series power units.

[0022] Figure 4 This utility model presents a circuit diagram of the emergency stop control and handover control module of the power quality comprehensive management unit in a power distribution circuit. Detailed Implementation

[0023] The specification and claims use certain terms to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0024] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] Appendix Figures 1-3The following is a detailed description of the present invention in conjunction with the accompanying drawings, illustrating the preferred embodiment of a power distribution circuit for comprehensive power quality management.

[0027] A power distribution circuit for comprehensive power quality management includes: an incoming line unit, a metering unit, an intelligent fusion terminal, an outgoing line unit, and a power quality comprehensive management unit. The incoming line unit is divided into two branches, one of which is electrically connected to the intelligent fusion terminal, and the other is electrically connected to the metering unit and the power quality comprehensive management unit in sequence. The power quality comprehensive management unit is electrically connected to the outgoing line unit.

[0028] The metering unit specifically consists of a concentrator, an energy meter, and a first current transformer group 1TA connected in series to the incoming line side. The metering unit is electrically connected to the first circuit breaker group 1TA, which is electrically connected to the second current transformer group 2TA. The second current transformer group 2TA has two branches: one is electrically connected to a fuse FU and a surge protector SPD in sequence and then connected to the grounding terminal; the other is electrically connected to the power quality management unit.

[0029] The power quality management unit includes a transformer, a reactive power compensation unit, a series-side power unit, and a parallel-side power unit. The input side of the series-side power unit is electrically connected to the output terminal of the transformer. The series-side power unit is connected in series with the parallel-side power unit and connected to one side of the transformer's input terminal. The other side of the transformer's input terminal is electrically connected to the reactive power compensation unit.

[0030] The transformer selected is one with a built-in temperature relay. The signal line of the temperature relay is connected to the DC-AC inverter power unit. The DC-AC inverter power unit controller receives the status information of the temperature relay and obtains the current temperature status of the transformer.

[0031] The reactive power compensation unit includes a fourth circuit breaker QF4, a surge arrester F, a common compensation capacitor 1C, and a separate compensation capacitor 2C. Specifically, the reactive power compensation unit is electrically connected to the fourth circuit breaker QF4 from the other side of the transformer input terminal. The output terminal of the fourth circuit breaker QF4 is divided into two branches. One branch is electrically connected to the surge arrester, which is connected to the grounding terminal. The surge arrester's function is to absorb various lightning overvoltages and switching overvoltages. The other branch is electrically connected to the common compensation capacitor 1C and the separate compensation capacitor 2C, which are connected in parallel.

[0032] The series-connected power unit of the transformer is specifically an AC-DC rectifier power unit, and the parallel-connected power unit is specifically a DC-AC inverter power unit. The power quality comprehensive management unit is specifically configured such that the transformer output side is electrically connected in sequence to the disconnecting switch QS1, the AC-DC rectifier power unit, the DC-AC inverter power unit, and the fifth circuit breaker QF5 to the transformer input side. The output side of the disconnecting switch QS1 is also electrically connected to a power electronic voltage regulating bypass module.

[0033] The outgoing unit consists of three outgoing branches, and is equipped with a first circuit breaker QF1, a second circuit breaker QF2, and a third circuit breaker QF3 in sequence.

[0034] The power quality management unit also includes an emergency stop control module, a handover control module, and a cooling fan module. The cooling fan module is electrically connected to a power electronic voltage regulator module. The power electronic voltage regulator module supplies power to the cooling fan module and controls its rotation.

[0035] The emergency stop control module and the handover control module are electrically connected to the DC-AC inverter power unit. They are used for circuit on / off control during emergency stop scenarios and handover operations.

[0036] The series-side power unit and the parallel-side power unit are connected via a ribbon cable for RS-485 communication. The common compensation capacitor is connected to the series-side power unit via a ribbon cable for RS-485 communication. The series-side power unit is connected to the intelligent fusion terminal via a ribbon cable for RS-485 communication. The current status of each component can be monitored in real time through RS-485 communication.

[0037] The power quality management unit also includes a display module, which is connected to the DC-AC inverter power module via a signal line for RS-485 communication. The display module is connected to the power supply line via the input terminal of the AC-DC rectifier power unit. The controller of the DC-AC inverter power module displays the collected data information through the display module.

[0038] The controller of the DC-AC inverter power module is also connected to the converter and the switch port via an RS-485 communication interface. Data can be viewed and adjusted via a cloud platform, which can also generate graphs from the acquired real-time data and analyze the current status of the equipment.

[0039] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A power distribution circuit for comprehensive power quality management, characterized in that, include: The system includes an incoming line unit, a metering unit, an intelligent converged terminal, an outgoing line unit, and a power quality comprehensive management unit. The incoming line unit is divided into two branches, one of which is electrically connected to the intelligent converged terminal, and the other is electrically connected to the metering unit and the power quality comprehensive management unit in sequence. The power quality comprehensive management unit is electrically connected to the outgoing line unit. The power quality management unit includes a transformer, a reactive power compensation unit, a series-side power unit, and a parallel-side power unit. The input side of the series-side power unit is electrically connected to the output end of the transformer. The series-side power unit is connected in series with the parallel-side power unit, and the other end of the parallel-side power unit is electrically connected to the input end of the transformer.

2. The power distribution circuit for comprehensive power quality management according to claim 1, characterized in that, The series-side power unit is specifically an AC-DC rectifier power unit, and the parallel-side power unit is specifically a DC-AC inverter power unit.

3. The power distribution circuit for comprehensive power quality management according to claim 2, characterized in that, The power quality comprehensive management unit is specifically configured such that the output side of the transformer is electrically connected in sequence to the disconnecting switch QS1, the AC-DC rectifier power unit, the DC-AC inverter power unit, and the fifth circuit breaker QF5 to the input side of the transformer. The output side of the disconnecting switch QS1 is also electrically connected to a power electronic voltage regulating bypass module.

4. The power distribution circuit for comprehensive power quality management according to claim 3, characterized in that, The reactive power compensation unit includes a fourth circuit breaker QF4, a surge arrester F, a common compensation capacitor 1C, and a separate compensation capacitor 2C. Specifically, the reactive power compensation unit is electrically connected to the fourth circuit breaker QF4 on the other side of the transformer input terminal. The output terminal of the fourth circuit breaker QF4 is divided into two branches. One branch is electrically connected to the surge arrester F, which is connected to the ground terminal. The other branch is electrically connected to the common compensation capacitor 1C and the separate compensation capacitor 2C, which are connected in parallel.

5. A power distribution circuit for comprehensive power quality management according to claim 1, characterized in that, The metering unit specifically consists of a concentrator, an energy meter, and a first current transformer group 1TA connected in series and connected to the incoming line side.

6. A power distribution circuit for comprehensive power quality management according to claim 5, characterized in that, The metering unit is electrically connected to the second current transformer group 2TA. The second current transformer group is further divided into two branches. One branch connects to the fuse FU and the surge protector SPD in sequence and is connected to the grounding terminal. The other branch connects to the power quality management unit.

7. A power distribution circuit for comprehensive power quality management according to claim 4, characterized in that, The series-side power unit and the parallel-side power unit are connected via a ribbon cable for RS-485 communication. The common compensation capacitor 1C is connected to the series-side power unit via a ribbon cable for RS-485 communication. The series-side power unit is connected to the intelligent fusion terminal via a ribbon cable for RS-485 communication.

8. A power distribution circuit for comprehensive power quality management according to claim 7, characterized in that, The power quality comprehensive management unit is also equipped with an emergency stop control module, a handover control module, and a cooling fan module.

9. A power distribution circuit for comprehensive power quality management according to claim 8, characterized in that, The cooling fan module is electrically connected to the power electronic voltage regulating module, and the emergency stop control module and the handover control module are electrically connected to the DC-AC inverter power unit.

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