CN217406243U - Middle-high voltage direct-hanging device and power supply switching circuit thereof - Google Patents
Middle-high voltage direct-hanging device and power supply switching circuit thereof Download PDFInfo
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- CN217406243U CN217406243U CN202221069695.5U CN202221069695U CN217406243U CN 217406243 U CN217406243 U CN 217406243U CN 202221069695 U CN202221069695 U CN 202221069695U CN 217406243 U CN217406243 U CN 217406243U
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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
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- 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
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Abstract
The application discloses high-voltage cascade energy storage device and power supply switching circuit thereof relates to the electronic circuit field. The power supply switching circuit comprises a relay, a high-voltage diode, a low-voltage diode, a high-voltage power supply, a low-voltage power supply, a master control system of a medium-high voltage direct-hanging device connected with the control end of the relay, thereby controlling the on-off of the high-voltage power supply and the low-voltage power supply, selectively comparing and inputting through the high-voltage diode and the low-voltage diode, namely, the power supply with large voltage supplies power to the main control system, so that the high-voltage diode supplies power to the main control system, when the running power supply needs to be switched, the main control system controls the high-voltage power supply to be partially disconnected, therefore, the seamless switching of the power supply is realized by supplying power by the low-voltage power supply, compared with the prior art, the low-voltage power supply is always in the running state when the high-voltage power supply is disconnected, therefore, the problem of power supply interruption does not exist during switching, and seamless switching of the power supply is realized.
Description
Technical Field
The present disclosure relates to the field of circuit electronics, and more particularly, to a high-voltage cascade energy storage device and a power switching circuit thereof.
Background
In recent years, with the acceleration and the progress of social industrialization, the situations of high-voltage power utilization are more and more, and now common medium-high voltage direct-hanging devices include a medium-high voltage direct-hanging energy storage system, a medium-high voltage direct-hanging grid-connected photovoltaic power generation system and the like, and for these systems, due to the medium-high level power taking characteristic, the power supply of the systems is generally required to be switched.
The power supply switching of the existing medium-high voltage direct-hanging device is usually performed by controlling a switch, so that after a control circuit is disconnected, the power supply connected to a main control system is changed by a connection mode in the circuit, and the power supply switching is performed.
In view of the above-mentioned technologies, a power switching circuit capable of realizing seamless switching is an urgent problem to be solved by those skilled in the art.
Disclosure of Invention
The application aims to provide a power supply switching circuit, so that the problem that the current power supply switching circuit cannot be seamlessly switched, and therefore the loss of production and life is caused is solved.
In order to solve the above technical problem, the present application provides a power switching circuit, which is applied to a medium-high voltage direct-hanging device, and comprises: the high-voltage diode is connected with the high-voltage power supply;
a coil of the relay is connected with a main control system of the medium-high voltage direct-hanging device, a first switch end of the relay is connected with the high-voltage power supply, and a second switch end of the relay is connected with the low-voltage power supply and used for controlling power supply to the coil according to signals of the main control system, so that the first switch end and the second switch end are controlled to be switched on and off so as to control the high-voltage power supply and the low-voltage power supply to be switched on and off;
the input end of the high-voltage diode is connected with the output end of the high-voltage power supply, and the output end of the high-voltage diode is connected with the power supply end of the master control system;
the input end of the low-voltage diode is connected with the output end of the low-voltage power supply, and the output end of the low-voltage diode is connected with the power supply end of the master control system.
Preferably, the coil of the relay includes a first coil and a second coil, the first coil corresponds to the first switch end and is configured to control the opening and closing of the first switch end, and the second coil corresponds to the second switch end and is configured to control the opening and closing of the second switch end.
Preferably, the method further comprises the following steps: and one end of the voltage sampling device is connected with the master control system, and the other end of the voltage sampling device is connected with the low-voltage power supply.
Preferably, the high-voltage diode and the low-voltage diode are schottky diodes.
Preferably, the high-voltage power supply is a high-level power supply obtained through a current transformer.
Preferably, the low-voltage power supply is a dc UPS power supply or an ac UPS power supply.
Preferably, the medium-high voltage direct-hanging device is a medium-high voltage direct-hanging photovoltaic power generation device, the high-voltage power supply is obtained through grid-connected high potential, and the low-voltage power supply is bus voltage obtained after an MPPT link of a photovoltaic power generation system DC-DC conversion.
Preferably, the method further comprises the following steps: and the alarm device is connected with the master control system.
In order to solve the above problem, the present application further provides a medium-high voltage direct-hanging device, which includes the above power switching circuit.
The power supply switching circuit provided by the application is applied to a medium-high voltage direct-hanging device and comprises a relay, a high-voltage diode, a low-voltage diode, a high-voltage power supply and a low-voltage power supply, wherein a main control system of the medium-high voltage direct-hanging device is connected with a control end of the relay so as to control the on-off of the high-voltage power supply and the low-voltage power supply, the outputs of the high-voltage power supply and the low-voltage power supply are respectively connected with the inputs of the high-voltage diode and the low-voltage diode, and the outputs of the high-voltage diode and the low-voltage diode are connected with a power supply end of the main control system, so that when the main control system works normally, the relay is controlled to simultaneously operate the high-voltage power supply and the low-voltage power supply, the high-voltage power supply supplies power to the main control system through the high-voltage diode and the low-voltage diode, when the operating power supply needs to be switched, then the major control system control high voltage power supply part disconnection to supply power by the low voltage power supply, realize the seamless switching of power, consequently compare with prior art, this application is because when disconnecting high voltage power supply, and the low voltage power supply is in running state always, consequently when switching, can not have the problem of power supply interruption, thereby has realized the seamless switching of power.
The medium-high voltage direct-hanging device comprises the power supply switching circuit, and therefore the medium-high voltage direct-hanging device has the advantages.
Drawings
In order to more clearly illustrate the embodiments of the present application, the drawings needed for the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a circuit diagram of a power switching circuit according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in 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 the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the present application.
The core of the application is to provide a power supply switching circuit so as to solve the problem that the current power supply switching circuit cannot be seamlessly switched, and therefore the loss of production and life is caused.
In order that those skilled in the art will better understand the disclosure, the following detailed description will be given with reference to the accompanying drawings.
Fig. 1 is a circuit diagram of a power switching circuit according to an embodiment of the present application, which is applied to a medium-high voltage direct-hanging device, and as shown in fig. 1, the power switching circuit includes: the relay U1, a high-voltage diode D1, a low-voltage diode D2, a high-voltage power supply 1 and a low-voltage power supply 2;
the coil of the relay U1 is connected with the master control system 3 of the medium-high voltage direct-hanging device, the first switch end of the relay U1 is connected with the high-voltage power supply 1, the second switch end of the relay U1 is connected with the low-voltage power supply 2, and the relay U1 is used for controlling power supply to the coil according to signals of the master control system 3, so that the opening and closing of the first switch end and the second switch end are controlled to control the opening and closing of the high-voltage power supply 1 and the low-voltage power supply 2;
the input end of the high-voltage diode D1 is connected with the output end of the high-voltage power supply 1, and the output end is connected with the power supply end of the main control system 3;
the input end of the low-voltage diode D2 is connected with the output end of the low-voltage power supply 2, and the output end is connected with the power supply end of the main control system 3.
A Relay (Relay), also called Relay, is an electronic control device having a control system (also called input loop) and a controlled system (also called output loop), usually applied in an automatic control circuit, which is actually an "automatic switch" that uses a smaller current to control a larger current. Therefore, the circuit plays the roles of automatic regulation, safety protection, circuit conversion and the like. It should be noted that, in the present embodiment, the specific type of the relay is not limited, and as shown in fig. 1, the relay U1 is composed of two parts, i.e., a coil and a contact set, so the graphic symbol of the relay U1 in the circuit diagram also includes two parts: one long square represents a coil; a group of contact symbols represents a contact combination, and in this embodiment, the first switch end and the second switch end are both contacts of the relay U1, it can be understood that the control manner of the coil in this embodiment for the first switch end and the second switch end may be solved in a manner that two contact response manners are different, or a manner that two coils respectively correspond to two switch ends, which is not specifically limited herein.
In the present embodiment, the connection manner of the relay U1 is not limited, that is, the specific connection of the first switch terminal and the second switch terminal with the coil of the relay U1 and the corresponding circuit connection manner are not limited.
In this embodiment, specific types and devices of the high-voltage power supply 1, the low-voltage power supply 2, and the corresponding master control system 3 are not limited, and different preferred access is available for the high-voltage power supply 1, the low-voltage power supply 2, and the corresponding master control system according to different medium-high voltage direct-hanging devices, for example, due to power consumption limitation, in order to fully ensure battery utilization rate and efficiency, state-of-charge discharge efficiency of a battery, system efficiency, and the like, it is not recommended that a power supply is directly provided by the battery, and power is required to be taken from an ac side high voltage (10/35kV) on the premise that conditions are met; or in the middle-high direct-hanging type photovoltaic power generation system, for high reliability of the system, the redundant part of the power supply needs to be taken from different power supplies, the low-voltage power supply 2 is taken from the bus voltage after the maximum power point tracking link of the photovoltaic power generation system DC-DC conversion, and the high-voltage power supply 1 is taken from the grid-connected side of high potential.
Diodes, electronic components, a device with two electrodes, allow current to flow only in a single direction, and many applications use the rectifying function. And the varactor is used as an electronically tunable capacitor. The current directivity of most diodes is commonly referred to as "Rectifying" (rectification). The most common function of a diode is to allow current to pass in a single direction (referred to as forward biasing) and to block current in the reverse direction (referred to as reverse biasing). Thus, the diode can be thought of as an electronic version of the check valve. Therefore, due to the reverse blocking capability of the diode, in this embodiment, a corresponding selection function can be performed, that is, one end with a high voltage is selected to be conducted, so it can be understood that, when the main control system 3 needs to supply power, the relay U1 is controlled to close the first switch end and the second switch end corresponding to the high-voltage power supply 1 and the low-voltage power supply 2, and the high-voltage power supply 1 and the low-voltage power supply 2 are simultaneously started through the closing of the switch ends, because of the existence of the high-voltage diode D1 and the low-voltage diode D2, the high-voltage power supply 1 with a higher voltage and the low-voltage power supply 2 with a lower voltage are conducted at this time, when the low-voltage power supply 2 needs to be connected, the main control system 3 only needs to disconnect the first switch end, and the voltage of the high-voltage power supply 1 is 0 and therefore the low-voltage power supply 2 is connected at this time, and the double-diode structure adopted in this embodiment is compared with the comparator, the cost is low.
The power switching circuit provided by this embodiment is applied to a medium-high voltage direct-hanging device, and includes a relay U1, a high-voltage diode D1, a low-voltage diode D2, a high-voltage power supply 1, a low-voltage power supply 2, a master control system 3 of the medium-high voltage direct-hanging device is connected to a control end of the relay U1 so as to control the on/off of the high-voltage power supply 1 and the low-voltage power supply 2, outputs of the high-voltage power supply 1 and the low-voltage power supply 2 are respectively connected to inputs of the high-voltage diode D1 and the low-voltage diode D2, and outputs of the high-voltage diode D1 and the low-voltage diode D2 are connected to a power supply end of the master control system 3, so that when the master control system 3 normally works, the relay U1 is controlled to simultaneously operate the high-voltage power supply 1 and the low-voltage power supply through selective comparison inputs of the high-voltage diode D1 and the low-voltage diode D2, that is the power supply with the main control system 3 with a large voltage, so that the high-voltage diode D1 supplies power to the master control system 3, when the operation power supply needs to be switched, the main control system 3 controls the high-voltage power supply 1 to be partially disconnected, so that the low-voltage power supply 2 supplies power, and seamless switching of the power supply is realized.
In the above-described embodiment, the specific type of the relay U1 is not limited, and it is preferable that the coil of the relay U1 includes a first coil and a second coil, the first coil corresponds to the first switch terminal and controls the opening and closing of the first switch terminal, and the second coil corresponds to the second switch terminal and controls the opening and closing of the second switch terminal.
It should be noted that the principle of the control of the relay U1 is to control the closing of the contacts through electromagnetic induction between the coil and the contacts, that is, through the power on and power off of the coil, so that in this embodiment, a form of the relay U1 in which the double coil corresponds to the double contacts is adopted, so as to achieve the purpose of accurately controlling the first contact and the second contact, and increase the controllability of the circuit.
In view of the need to ensure high reliability of the power supply of the master control system 3, a preferred solution is proposed herein, the circuit further comprising: and one end of the voltage sampling device 4 is connected with the master control system 3, and the other end of the voltage sampling device 4 is connected with the low-voltage power supply 2.
It should be noted that the voltage sampling device 4 is used for sampling the voltage of the low-voltage power supply 2, and it can be understood that the high-voltage power supply 1 generally has a large magnitude due to an excessively high voltage, and the requirement for the voltage precision is not high during high-voltage power supply, so that the high-voltage power supply 1 is not generally sampled, and the low-voltage power supply 2 generally samples the low-voltage power supply 2, so that the voltage stability of the medium-high voltage direct-hanging device in a low-voltage state is ensured, and the actual voltage input into the main control system 3 is controlled by voltage sampling, so that the stable operation of the main control system 3 in a low-voltage state is ensured.
The type of diode is not limited in the above embodiments, and a preferred scheme is provided, in which the high-voltage diode D1 and the low-voltage diode D2 are schottky diodes.
It should be noted that, because the specific types of the medium-high voltage direct-hanging device are different, the types selected by the high-voltage power supply 1 and the low-voltage power supply 2 are also different, and thus the current input to the main control system 3 may be ac or dc, and it can be understood that, by setting the high-voltage diode D1 and the low-voltage diode D2 as schottky diodes, the power supply input to the main control system 3 can be stabilized, and the input high-voltage current or low-voltage current can be regulated or rectified under the condition that the access selection of the high-voltage diode D1 and the low-voltage diode D2 to the voltage is ensured, so that the stability of the circuit is ensured, and the stable operation of the power supply of the main control system 3 is maintained.
In the above embodiment, the high-voltage power supply 1 is not specifically limited, and a preferable scheme is proposed herein, where the high-voltage power supply 1 is a high-level power supply obtained by a current transformer.
The current transformer principle is based on the electromagnetic induction principle. The current transformer is composed of a closed iron core and a winding. The primary side winding of the current transformer has few turns and is connected in series in a circuit of current to be measured, so that all current of the circuit always flows through the current transformer, the secondary side winding has more turns and is connected in series in a measuring instrument and a protection circuit, and when the current transformer works, the secondary side circuit of the current transformer is always closed, so that the impedance of the series coil of the measuring instrument and the protection circuit is very small, and the working state of the current transformer is close to short circuit. The current transformer converts a large current on the primary side into a small current on the secondary side for use, and the secondary side cannot be opened. The current transformer has the advantages that the primary current with large numerical value can be converted into the secondary current with small numerical value through a certain transformation ratio, the secondary current is used for protection, measurement and the like, the safety of elements in a circuit is guaranteed through the current transformer, and the phenomenon that the elements are burnt out due to overlarge current caused by the fact that the high-voltage power supply 1 is directly connected into the circuit is avoided.
In the above embodiments, the low voltage power supply 2 is not limited, and a preferred scheme is proposed herein, in which the low voltage power supply 2 is a dc UPS power supply or an ac UPS power supply.
An Uninterruptible Power Supply (UPS) is a constant voltage and constant frequency UPS that includes an energy storage device and an inverter as a main component. The device is mainly used for providing uninterrupted power supply for a single computer, a computer network system or other power electronic equipment. When the mains supply input is normal, the UPS supplies the mains supply to the load for use after stabilizing the voltage of the mains supply, and the UPS is an alternating current mains supply voltage stabilizer and also charges a built-in battery at the same time; when the commercial power is interrupted (power failure in accident), the UPS immediately supplies 220V alternating current to the load by the electric energy of the battery in the UPS through an inversion conversion method, so that the load can maintain normal work and the software and hardware of the load are protected from being damaged. UPS devices typically provide protection against both excessive voltages and low voltages. The circuit can be maintained to stably work in a low-voltage state by selecting a direct-current UPS power supply or an alternating-current UPS power supply, and the over-low voltage is avoided.
In the above embodiment, the selection of the high-voltage power supply 1 and the selection of the low-voltage power supply 2 under the specific type of the medium-high voltage direct-hanging device are not specifically limited, and a preferable scheme is provided herein, in which the medium-high voltage direct-hanging device is a medium-high voltage direct-hanging photovoltaic power generation device, the high-voltage power supply 1 is a power supply obtained through grid-connected high potential, and the low-voltage power supply 2 is a bus voltage obtained after an MPPT link of DC-DC conversion of the photovoltaic power generation system.
It should be noted that photovoltaic is a short for solar photovoltaic power generation system, and is a novel power generation system that directly converts solar radiation energy into electrical energy by using the photovoltaic effect of a solar cell semiconductor material. Grid connection means that a power transmission line of a generator set is connected with a power transmission network in the power industry. Maximum Power Point Tracking (MPPT) is a core technology adopted by upgrading and upgrading products of the conventional solar charge and discharge controller.
In the embodiment, when the selected medium-high voltage direct-hanging device is a photovoltaic power generation device, the selection of the high-voltage power supply 1 and the low-voltage power supply 2 is limited, so that the maximum utilization of the photovoltaic power generation power supply and the stability of power supply of the photovoltaic power generation power supply are ensured under a photovoltaic system, and the self-power generation control of the photovoltaic power generation device is realized.
Considering that the master control system 3 fails to switch the power supply in time under special conditions, the method further includes: and the alarm device is connected with the main control system 3.
That is, the alarm device provided in this embodiment sends an alarm when it is detected that the voltage of the power supply of the main control system 3 does not match the voltage required by the main control system 3.
In the preferred scheme provided in this embodiment, the alarm device is used to remind the user that there is a problem in the power supply in the main control system 3, so as to remove the fault and avoid the occurrence of safety accidents.
In order to solve the above problem, the present application further provides a medium-high voltage direct-hanging device, which includes the above power switching circuit.
The medium-high voltage direct-hanging device provided by the application and the power supply switching circuit are in an inclusive relationship, that is, the medium-high voltage direct-hanging device includes the power supply switching circuit, so that the specific embodiments and beneficial effects are shown in the power supply switching circuit part, and are not described herein again.
The medium-high voltage direct-hanging device and the power switching circuit thereof provided by the present application are described in detail above. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (9)
1. A power switching circuit is applied to a medium-high voltage direct-hanging device and comprises: the high-voltage diode is connected with the high-voltage power supply;
a coil of the relay is connected with a master control system of the medium-high voltage direct-hanging device, a first switch end of the relay is connected with the high-voltage power supply, and a second switch end of the relay is connected with the low-voltage power supply and used for controlling power supply to the coil according to signals of the master control system, so that the first switch end and the second switch end are controlled to be opened and closed, and the high-voltage power supply and the low-voltage power supply are controlled to be opened and closed conveniently;
the input end of the high-voltage diode is connected with the output end of the high-voltage power supply, and the output end of the high-voltage diode is connected with the power supply end of the master control system;
the input end of the low-voltage diode is connected with the output end of the low-voltage power supply, and the output end of the low-voltage diode is connected with the power supply end of the master control system.
2. The power supply switching circuit according to claim 1, wherein the coil of the relay includes a first coil corresponding to the first switch terminal for controlling the opening and closing of the first switch terminal, and a second coil corresponding to the second switch terminal for controlling the opening and closing of the second switch terminal.
3. The power switching circuit of claim 1, further comprising: and one end of the voltage sampling device is connected with the master control system, and the other end of the voltage sampling device is connected with the low-voltage power supply.
4. The power switching circuit of claim 3, wherein the high voltage diode and the low voltage diode are Schottky diodes.
5. The power switching circuit according to any one of claims 1 to 4, wherein the high voltage power supply is a high level power supply obtained by a current transformer.
6. The power switching circuit according to any one of claims 1 to 4, wherein the low-voltage power source is a DC UPS power source or an AC UPS power source.
7. The power switching circuit according to claim 1, wherein the medium-high voltage direct-mounted device is a medium-high voltage direct-mounted photovoltaic power generation device, the high-voltage power supply is a power supply obtained by grid-connected high potential, and the low-voltage power supply is a bus voltage obtained after an MPPT link of a DC-DC conversion of a photovoltaic power generation system.
8. The power switching circuit of claim 1, further comprising: and the alarm device is connected with the master control system.
9. A medium-high voltage direct-hanging device, characterized by comprising the power switching circuit of any one of claims 1 to 8.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN202221069695.5U CN217406243U (en) | 2022-05-06 | 2022-05-06 | Middle-high voltage direct-hanging device and power supply switching circuit thereof |
| PCT/CN2023/097954 WO2023213330A1 (en) | 2022-05-06 | 2023-06-02 | Medium-high voltage suspended apparatus and power supply switching circuit thereof |
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| CN202221069695.5U CN217406243U (en) | 2022-05-06 | 2022-05-06 | Middle-high voltage direct-hanging device and power supply switching circuit thereof |
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| CN217406243U true CN217406243U (en) | 2022-09-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023213330A1 (en) * | 2022-05-06 | 2023-11-09 | 海南金盘智能科技股份有限公司 | Medium-high voltage suspended apparatus and power supply switching circuit thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023213330A1 (en) * | 2022-05-06 | 2023-11-09 | 海南金盘智能科技股份有限公司 | Medium-high voltage suspended apparatus and power supply switching circuit thereof |
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