CN112350328A - Low-voltage power supply compensation system, method and related device - Google Patents
Low-voltage power supply compensation system, method and related device Download PDFInfo
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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
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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Abstract
The application discloses compensation system, method and relevant device of low voltage power supply, and the system includes: the current transformer is connected with a target circuit at the side of the power grid and is used for generating mutual induction current; and a primary wiring coil of the current-voltage converter is connected with the current transformer, and a secondary wiring coil of the current-voltage converter is connected with a user side and used for acquiring alternating current compensation voltage. When the user load is increased, the alternating current compensation voltage is synchronously increased to make up the voltage drop of a power grid transformer and a line; when the user load is reduced or zero, the AC compensation voltage is synchronously reduced or zero. The system adopts passive devices to construct a voltage compensation topological circuit, has high reliability, and has no problem that a control device needs to be independently powered. The technical problems that the existing power grid compensation technology has more power electronic devices, poor reliability, weak power grid impact resistance and poor low-voltage power supply compensation performance due to the fact that the existing power grid compensation technology is not suitable for low-voltage power supply networks are solved.
Description
Technical Field
The present application relates to the field of power optimization technologies, and in particular, to a compensation system and method for low voltage power supply, and a related device.
Background
Electric energy is an economic, practical, clean and easily controlled and converted energy form, and the application range of the electric energy is one of the main signs of the national development level. As a special commodity, the electric energy also has the characteristics that the commodity index can be measured, the commodity form can be described, the commodity performance can be improved and the like. Thus, like other commercial products, power should also address quality issues.
Through the construction and the transformation of a large-scale power distribution network in recent years, a 10kV power distribution network is greatly improved, most of high-loss distribution transformers are replaced by low-loss transformers, and the power supply quality is improved. However, agricultural distribution network reconstruction funds are limited, the power grid structure of partial regions is still weak, high-voltage distribution network dense distribution points cannot be implemented in remote regions, and a certain number of long-distance lines with power supply radiuses exceeding national regulations exist, so that terminal voltage is difficult to guarantee. Meanwhile, as the power consumption in remote areas continuously increases, the power consumption quality in the relevant areas cannot be guaranteed, such as a single-phase voltage is lower than a normal value range, a three-phase voltage is lower than a certain phase, and the like, and therefore, the improvement of the power quality is urgent.
The existing compensation equipment mostly adopts power electronic devices such as IGBT and the like to provide compensation voltage, the cost is high, the power electronic devices have poor power grid impact resistance, the explosion risk exists, and the requirement on the running environment is high; the problem that a compensation circuit is complex and the like exists, the low-voltage power supply network is not suitable for low-voltage power supply networks, and the problem of the quality of low-voltage power supply electric energy cannot be effectively solved.
Disclosure of Invention
The application provides a compensation system, a compensation method and a relevant device for low-voltage power supply, which are characterized in that a voltage compensation topological circuit is constructed by adopting all passive devices, the reliability is high, and the problem that a control device needs to be supplied with power independently is solved. The method is used for solving the technical problems of poor low-voltage power supply compensation performance caused by more power electronic devices, poor reliability, weak power grid impact resistance, inapplicability to low-voltage power supply networks and the like in the conventional power grid compensation technology.
In view of the above, the first aspect of the present application provides a compensation system for low voltage power supply, comprising: current transformers and current-to-voltage converters;
the current transformer is connected with a target circuit at the side of the power grid and is used for generating mutual induction current;
and a primary wiring coil of the current-voltage converter is connected with the current transformer, and a secondary wiring coil of the current-voltage converter is connected with a user side and used for acquiring alternating current compensation voltage.
Optionally, the target line comprises a single-phase power line or a three-phase power line.
Optionally, the alternating current compensation voltage and the mutual inductance current are in a preset linear proportional relationship, where the preset linear proportional relationship is expressed as:
ΔU＝K×IL；
wherein K is a proportionality coefficient, ILFor the mutual inductance current, Δ U is the alternating compensation voltage.
Optionally, the number of turns of the primary wiring coil and the number of turns of the secondary wiring coil are in a preset proportional relationship.
A second aspect of the present application provides a compensation method for low voltage power supply, including:
converting the current on the grid side target line into mutual inductance current according to the electromagnetic induction principle;
carrying out alternating voltage conversion on the mutual inductance current by a current-voltage conversion principle to obtain alternating compensation voltage;
and providing self-adaptive power supply for the user side according to the alternating current compensation voltage.
Optionally, the target line comprises a single-phase power line or a three-phase power line.
Optionally, the alternating current compensation voltage and the mutual inductance current are in a preset linear proportional relationship, where the preset linear proportional relationship is expressed as:
ΔU＝K×IL；
wherein K is a proportionality coefficient, ILFor the mutual inductance current, Δ U is the alternating compensation voltage.
A third aspect of the application provides a low voltage powered compensation device, the device comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the low voltage supply compensation method according to the second aspect according to instructions in the program code.
A fourth aspect of the present application provides a computer-readable storage medium for storing program code for performing the low voltage supply compensation method of the second aspect.
A fifth aspect of the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of low voltage supply compensation of the second aspect.
According to the technical scheme, the embodiment of the application has the following advantages:
in this application, a compensation system for low voltage power supply is provided, comprising: the current transformer is connected with a target circuit at the side of the power grid and is used for generating mutual induction current; and a primary wiring coil of the current-voltage converter is connected with the current transformer, and a secondary wiring coil of the current-voltage converter is connected with a user side and used for acquiring alternating current compensation voltage.
The application provides a compensation system of low-voltage power supply establishes ties compensation circuit on the target circuit of electric wire netting side, then obtains mutual inductive current through the electromagnetic induction principle with the current on the target circuit through current mutual inductance coil, and mutual inductive current converts alternating current compensation voltage into through current-voltage converter. The compensation circuit has the advantages that the compensation provided for the user side presents a positive compensation characteristic, the obtained alternating current compensation voltage and the current of the target line are in a positive correlation relationship, when the user load is increased, the alternating current compensation voltage is synchronously increased, and the voltage drop of a power grid transformer and the line is compensated; when the user load is reduced or zero, the alternating current compensation voltage is synchronously reduced or zero; therefore, the electric energy quality requirement of the user can be met in a self-adaptive mode. In addition, the number of involved devices in the system is small, the circuit structure is simple and easy to realize, the voltage compensation topology circuit is constructed by adopting all passive devices, the reliability is high, and the problem that a control device needs to be supplied with power independently is solved. Therefore, the power electronic device can solve the technical problems that the existing power grid compensation technology is more in power electronic devices, poor in reliability, weak in power grid impact resistance, not suitable for a low-voltage power supply network and poor in low-voltage power supply compensation performance.
Drawings
Fig. 1 is a schematic structural diagram of a compensation system for low voltage power supply according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart of a compensation method for low voltage power supply according to an embodiment of the present disclosure;
fig. 3 is a schematic topology structure diagram of a compensation circuit for single-phase power supply according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood by those skilled in the art, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments that can be derived by a person skilled in the art from the embodiments given in the present application without making any creative effort shall fall within the protection scope of the present application.
The factors causing the low single-phase voltage or low three-phase voltage in remote areas are numerous, so that the quality of electric energy needs to be comprehensively managed through a voltage compensation circuit or system, and in the prior art, a low-voltage dynamic reactive power compensation device is adopted to realize reactive power compensation, filter out higher harmonics, stabilize the system voltage and reduce the line loss; but also causes the prior art to be limited to reactive compensation and not to adapt to the current complex electric energy management problem; the electric energy management function is single, and the power utilization environment of a low-voltage transformer area cannot be met, namely, the effect of solving the technical problem similar to the low voltage of a 400V power distribution network by the reactive compensation technical measure is not obvious. In addition, in the prior art, the IGBT full-control power electronic device is adopted, so that the power grid impact resistance is poor, the system robustness is poor, and the system is difficult to popularize and apply in a low-voltage power distribution network. Therefore, the optimized treatment of the low-voltage transformer area voltage is realized on the basis of the simplified compensation circuit which is connected in series in a targeted manner, wherein power electronic devices such as IGBTs are not involved, the circuit structure is simple and easy to implement, and the adaptive adjustment of the compensation voltage can be carried out according to the load condition of a user side.
For ease of understanding, referring to fig. 1, the present application provides an embodiment of a compensation system for low voltage power supply, comprising: a current transformer 101 and a current-to-voltage converter 102.
The current transformer 101 is connected with a target line on the power grid side and used for generating mutual induction current;
the primary connection coil of the current-to-voltage converter 102 is connected to a current transformer, and the secondary connection coil of the current-to-voltage converter is connected to the user side for obtaining an ac compensation voltage.
It should be noted that the current transformer is mainly composed of a mutual inductor, and is sleeved on the target circuit to generate a mutual inductance current, and a target voltage is obtained through a current-voltage converter according to the mutual inductance current, so as to obtain an alternating current compensation voltage. Taking a single-phase power supply line as an example, referring to fig. 3, in the embodiment of the present application, a voltage compensation circuit is connected in series to a live line between a power grid side and a user side, so as to convert a current on the power grid side through a current transformer into a mutual induction current, then convert the mutual induction current into an alternating current compensation voltage through a current-voltage converter, and adjust a voltage on the user side through the alternating current compensation voltage.
It will be understood that the destination line comprises a single phase powered hot line or each phase of a three phase powered line.
The voltage compensation topological structure is suitable for 400V distribution network single-phase power supply and is also suitable for 400V distribution network three-phase power supply; if the power supply is single-phase power supply, the compensation system in the embodiment of the application is connected in series to live wires on a power grid side and a user side; if the power supply is three-phase power supply, the power supply is respectively connected in series on the lines of the a phase, the b phase and the c phase and is close to the user side.
It is understood that the ac compensation voltage and the mutual inductance current are in a preset linear proportional relationship, and the preset linear proportional relationship is expressed as:
ΔU＝K×IL；
wherein K is a proportionality coefficient, ILIs a mutual inductance current, and delta U is an alternating current compensation voltage.
When the primary side current of the current-voltage converter changes in a considerable range, a voltage which is linearly proportional to the primary side current is required to be generated on the secondary side of the converter, and in order to enable the iron core of the converter to be in an unsaturated state, measures can be taken as follows: the lower iron core magnetic density is selected or a sufficiently large air gap is adopted in a magnetic circuit, the latter is more feasible, because most of excitation ampere turns are consumed in the air gap, the iron core magnetic circuit cannot have the saturation problem, and the proportional conversion relation between the output voltage of the current-voltage converter and the primary current is ensured.
Referring to fig. 3, the grid side voltage is U1, the grid side current is I1, the mutual induction current is I2, the user side voltage is U2, the ac compensation voltage is Δ U, the CT is a current transformer, and the I-V is a power circuit-voltage converter. The user side voltage U2 is composed of a grid side voltage U1 and an alternating current compensation voltage Δ U, that is, U2 is U1+ Δ U; the ac compensation voltage Δ U output by the current-voltage converter and the mutual inductance current are in the preset linear proportional relationship, and the mutual inductance current and the grid-side current I1 are also in the linear proportional relationship, which can be described as follows: i isLΦ × I1; wherein Φ is a ratioExample coefficients, therefore, the ac compensation voltage Δ U can be expressed as: Δ U — K × Φ × I1. According to the derivation, as the load on the user side increases, the grid-side current I1 increases, and the ac compensation voltage Δ U increases; as the load on the user side decreases, the grid side current I1 decreases, and the ac compensation voltage Δ U decreases accordingly; when the load on the user side is zero, the alternating current compensation voltage is also zero, so that the alternating current compensation voltage provided for the user side has a positive compensation characteristic. In addition, the compensation system in the embodiment of the application has a simple topological structure, a voltage compensation topological circuit is constructed by adopting all passive devices, the problem that a control device in the prior art needs to supply power independently is solved, power electronic devices and complex control circuits are not provided, the requirement on the operating environment is not high, the price is low, stability and reliability are realized, and the compensation system is suitable for voltage control of a low-voltage power distribution network similar to 400V.
It will be appreciated that the number of turns of the primary and secondary coils is a predetermined proportional relationship.
Because the voltage output by the current-voltage converter needs to be in a linear proportional relationship with the current, the number of turns of the primary wiring coil and the secondary wiring coil needs to be in a certain proportional relationship, and the primary wiring coil and the secondary wiring coil are specifically set according to the actual preset linear proportional relationship requirement, which is not described herein again.
The compensation system of low-voltage power supply that this application embodiment provided connects compensation circuit in series on the target circuit of electric wire netting side, then obtains mutual inductive current through the electromagnetic induction principle with the electric current on the target circuit through current mutual inductance coil, and mutual inductive current converts alternating current compensation voltage into through current-voltage converter. The compensation circuit has the advantages that the compensation provided by the user side presents a positive compensation characteristic, the obtained alternating current compensation voltage and the current of the target line are in a positive correlation relationship, and when the load of a user is increased, the alternating current compensation voltage is synchronously increased to compensate the voltage drop of a power grid transformer and the line; when the user load is reduced or zero, the alternating current compensation voltage is synchronously reduced or zero; therefore, the electric energy quality requirement of the user can be met in a self-adaptive mode. In addition, the quantity of devices involved in the system is small, the circuit structure is simple and easy to realize, the voltage compensation topological circuit is constructed by all passive devices, the reliability is high, and the problem that a control device needs to be supplied with power independently is solved. Therefore, the power electronic device compensation method and device can solve the technical problems that the existing power grid compensation technology is more in power electronic devices, poor in reliability, weak in power grid impact resistance and not suitable for a low-voltage power supply network, and accordingly low-voltage power supply compensation performance is poor.
For ease of understanding, referring to fig. 2, the present application provides an embodiment of a compensation method for low voltage power supply, including:
and step 203, providing self-adaptive power supply for the user side according to the alternating current compensation voltage.
Further, the target line includes a live line of a single-phase power supply or each phase line of a three-phase power supply.
Further, the alternating current compensation voltage and the mutual inductance current are in a preset linear proportional relationship, and the preset linear proportional relationship is represented as follows:
ΔU＝K×IL；
wherein K is a proportionality coefficient, ILIs a mutual inductance current, and delta U is an alternating current compensation voltage.
To facilitate understanding, the present application also provides a low voltage powered compensation device comprising a processor and a memory:
the memory is used for storing the program codes and transmitting the program codes to the processor;
the processor is configured to execute the compensation method for low voltage power supply in the above method embodiment according to instructions in the program code.
To facilitate understanding, the present application also provides a computer-readable storage medium for storing program code for performing the compensation method of the low voltage power supply in the above method embodiment.
To facilitate understanding, the present application also provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of compensation of low voltage supply of the above-described method embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a hardware form, and can also be realized in a software functional unit form.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for executing all or part of the steps of the method described in the embodiments of the present application through a computer device (which may be a personal computer, a server, or a network device). And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A low-voltage powered compensation system, comprising: current transformers and current-to-voltage converters;
the current transformer is connected with a target circuit at the side of the power grid and is used for generating mutual induction current;
and a primary wiring coil of the current-voltage converter is connected with the current transformer, and a secondary wiring coil of the current-voltage converter is connected with a user side and used for acquiring alternating current compensation voltage.
2. The low-voltage powered compensation system of claim 1, wherein the target line comprises a single-phase powered hot line or each phase line of a three-phase power supply.
3. A low-voltage powered compensation system as claimed in claim 1, wherein the ac compensation voltage is in a preset linear proportional relationship with the mutual induction current, the preset linear proportional relationship being expressed as:
ΔU＝K×IL；
wherein K is a proportionality coefficient, ILFor the mutual inductance current, Δ U is the alternating compensation voltage.
4. The low voltage powered compensation system of claim 1 wherein the number of coil turns of the primary winding is a preset proportional relationship to the number of coil turns of the secondary winding.
5. A method of compensating for a low voltage supply, comprising:
converting the current on the grid side target line into mutual inductance current according to the electromagnetic induction principle;
carrying out alternating voltage conversion on the mutual inductance current by a current-voltage conversion principle to obtain alternating compensation voltage;
and providing self-adaptive power supply for the user side according to the alternating current compensation voltage.
6. The method of claim 5, wherein the target line comprises a single-phase-powered hot line or each phase line of a three-phase power supply.
7. The compensation method for low voltage power supply according to claim 5, wherein the AC compensation voltage and the mutual induction current are in a preset linear proportional relationship, and the preset linear proportional relationship is expressed as:
ΔU＝K×IL；
wherein K is a proportionality coefficient, ILFor the mutual inductance current, Δ U is the alternating compensation voltage.
8. A low-voltage powered compensation device, the device comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the low voltage supply compensation method of any one of claims 5-7 according to instructions in the program code.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium is configured to store a program code for performing the low voltage supply compensation method of any of claims 5-7.
10. A computer program product comprising instructions which, when run on a computer, cause the computer to perform the low voltage supply compensation method of any one of claims 5 to 7.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108365605A (en) * | 2018-03-08 | 2018-08-03 | 西安爱科赛博电气股份有限公司 | A kind of low-voltage network three-phase line low-voltage governing system and method |
| CN109659946A (en) * | 2019-01-08 | 2019-04-19 | 广东电网有限责任公司 | A kind of distribution end Electric power route deivce topology and its control method |
| CN209571831U (en) * | 2019-03-28 | 2019-11-01 | 广西云涌科技有限公司 | It is a kind of can deep amplitude low-voltage regulator |
| CN110739697A (en) * | 2019-10-21 | 2020-01-31 | 广州供电局有限公司 | Low-voltage distribution network low-voltage treatment device and treatment method |
| CN111049149A (en) * | 2019-12-10 | 2020-04-21 | 东北电力大学 | Power grid terminal low voltage treatment method |
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2020
- 2020-10-29 CN CN202011184119.0A patent/CN112350328A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108365605A (en) * | 2018-03-08 | 2018-08-03 | 西安爱科赛博电气股份有限公司 | A kind of low-voltage network three-phase line low-voltage governing system and method |
| CN109659946A (en) * | 2019-01-08 | 2019-04-19 | 广东电网有限责任公司 | A kind of distribution end Electric power route deivce topology and its control method |
| CN209571831U (en) * | 2019-03-28 | 2019-11-01 | 广西云涌科技有限公司 | It is a kind of can deep amplitude low-voltage regulator |
| CN110739697A (en) * | 2019-10-21 | 2020-01-31 | 广州供电局有限公司 | Low-voltage distribution network low-voltage treatment device and treatment method |
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Application publication date: 20210209 |