CN109149652A - Novel micro-grid soft start control device - Google Patents

Novel micro-grid soft start control device Download PDF

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Publication number
CN109149652A
CN109149652A CN201811227367.1A CN201811227367A CN109149652A CN 109149652 A CN109149652 A CN 109149652A CN 201811227367 A CN201811227367 A CN 201811227367A CN 109149652 A CN109149652 A CN 109149652A
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Prior art keywords
contactor
circuit
switch
time relay
auxiliary contact
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CN201811227367.1A
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CN109149652B (en
Inventor
冯武平
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Trina Solar Co Ltd
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Trina Solar Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor And Converter Starters (AREA)

Abstract

The invention discloses a novel micro-grid soft start control device, which comprises a main circuit and a control circuit, wherein the main circuit comprises a multiphase alternating current circuit electrically connected with a transformer and soft start circuits respectively corresponding to a plurality of each phase alternating current circuits, and a soft start resistor Rs is connected into each soft start circuit; the control circuit is connected with a contactor KM1, a contactor KM2, a time relay KT, a switch SB1 and a switch SB 2; the contactor KM1 comprises a contactor KM1 coil, a contactor KM1 normally open auxiliary contact and a plurality of contactor KM1 main contacts which are respectively connected into a soft start circuit in a one-to-one correspondence mode. The invention is realized by adopting a contactor, a time relay, a soft start resistor and a switch to carry out hardware control, and has the advantages of simple control structure, strong stability of a control circuit and strong anti-interference capability. And the soft start power-on delay control circuit sets time through a time relay, can flexibly select between 1 s-99 min99s, and is simple and convenient to operate.

Description

A kind of novel micro-capacitance sensor control of soft device
Technical field
The invention belongs to microgrid fields, and in particular to a kind of novel micro-capacitance sensor control of soft device.
Background technique
With the development of intelligent micro-grid technology, micro-capacitance sensor application field is constantly widened, and the power supply capacity of micro-capacitance sensor is not It is disconnected to increase, therefore the necessary configuration isolation transformer at the points of common connection of micro-capacitance sensor and bulk power grid, to guarantee the safety of power grid.
Wherein the capacity of the transformer of micro-capacitance sensor configuration needs to meet the requirement of micro-capacitance sensor internal load and power supply, while must The requirement of upper level distribution capacity must be taken into account, therefore when transformer is powered, is easy the impact by power network current, influences load Safety.
Summary of the invention
To solve the above-mentioned problems, the present invention provides a kind of novel micro-capacitance sensor control of soft device, transformation is avoided Impact of the device by power network current, guarantees the safety utilization of electric power of load, ensures the safe operation of micro-grid system.
The technical solution of the present invention is as follows: a kind of novel micro-capacitance sensor control of soft device, including main circuit and control electricity Road, the main circuit include the polyphase ac circuit being electrically connected with transformer and respectively with multiple phase alternating current circuits pair every respectively The soft starting circuit answered, access has soft start resistance Rs in the soft starting circuit;
In the control circuit access have contactor KM1, contactor KM2, time time relay KT, switch SB1 and Switch SB2;
The contactor KM1 include contactor KM1 line packet, the normally opened auxiliary contact of contactor KM1 and multiple difference one by one Contactor KM1 main contacts in corresponding access soft starting circuit;
The contactor KM2 includes contactor KM2 line packet, the normally opened auxiliary contact of contactor KM2, contactor KM2 first normal It closes auxiliary contact, the second normally closed auxiliary contact of contactor KM2 and multiple correspond respectively and accesses the every of polyphase ac circuit Contactor KM2 main contacts in a phase line;
The time relay KT includes time relay KT line packet and the contact time relay KT;
The switch SB1, switch SB2, the first normally closed auxiliary contact of contactor KM2 and time relay KT line packet successively connect It connects to form main road, one end that the main road is located at switch SB1 is connect with phase line, and the other end is connect with zero curve;
Second normally closed auxiliary contact of contactor KM2 and contactor KM1 line packet are in turn connected to form the first branch, described The first branch has the section of the first normally closed auxiliary contact of contactor KM2 and time relay KT line packet in parallel with access in main road;
The normally opened auxiliary contact of the contactor KM1, the contact time relay KT and contactor KM2 line packet are sequentially connected shape At second branch, access has switch SB2, the first normally closed auxiliary contact of contactor KM2 and time in the second branch and main road The section of relay KT line packet is in parallel, and the normally opened auxiliary contact of contactor KM1 are in parallel with switch SB2;
Access has the route of contactor KM2 main contacts to form third branch, accesses in the third branch and second branch There is the section of the normally opened auxiliary contact of contactor KM1 and the contact time relay KT in parallel.
Polyphase ac circuit can be three-phase circuit in the present invention, and switch SB1 can be dynamic circuit breaker button switch, switch SB2 can switch for making button, and the starting principle process for carrying out soft start to transformer using the present invention is as follows:
(1) closure switch SB1;
(2) closure switch SB2;
(3) since the first normally closed auxiliary contact of contactor KM2 and the second normally closed auxiliary contact of contactor KM2 are closed, Contactor KM1 and time relay KT is powered, after contactor KM1 is powered, the normally opened auxiliary contact of contactor KM1 and contactor KM1 main contacts closure, i.e., so that electric current is via soft starting circuit inflow transformer, i.e., three-phase voltage passes through contactor KM1 and soft Starting resistance Rs is that transformer carries out being pre-charged soft;
(4) after time relay KT is powered, the contact time relay KT is closed after the delay time set, when Between relay KT contact closure, therefore the case where the normally opened auxiliary contact of contactor KM1 and the contact time relay KT are closed Under, contactor KM2 line packet is powered, so that contactor KM2 main contacts and the normally opened auxiliary contact of contactor KM2 are powered, contact Device KM2 main contacts bypasses contactor KM1 main contacts and soft start resistance, and Transformer Soft-Startup process terminates, and connects tentaculum KM2 Main contacts carries out normal power supply, contactor KM1 auxiliary contact closure, and contactor auxiliary contact KM1 bypasses switch SB2;
(5) after the normally opened auxiliary contact of contactor KM2 are powered, contactor KM2 line packet passes through switch SB1 and contactor KM2 Normally opened auxiliary contact (closed state) carry out continued power, and contactor KM2 main contacts is maintained to be in Operating In Persistent Current Mode state;
(6) contactor KM2 normally closed auxiliary contact (disconnection), contactor KM1 line packet power loss, time time relay KT line packet Power loss, contactor KM1 main contacts disconnect, and soft starting circuit disconnects, and contactor KM1 auxiliary contact and time relay contact are restored To original state (normally opened);
(7) switch SB1, contactor KM2 line packet power loss are disconnected, contactor KM2 main contacts disconnects, and transformer and multiphase are powered Naturally it disconnects, entire circuit is the state restored to before being powered.
Preferably, further including the by-pass switch K1 of switch SB2 in the control circuit.The present invention can also pass through bypass Switch K1 carries out remote switching control, i.e., long-range to control by-pass switch K1 using by-pass switch K1 as the by-pass switch of switch SB2 It is closed the starting process, it can be achieved that soft starting circuit.
Preferably, resistance value >=3U of the soft start resistance Rsn/In, wherein In is that transformer rated operational current is effective Value, Un is that network voltage is virtual value.
The rated operational current of contactor KM1 and contactor KM2 can there are many selections, preferably, the contactor The rated operational current of KM2 should be greater than the rated operational current of transformer.
Preferably, the rated current of the contactor KM1 is the 30% of transformer rated current.
Preferably, access has capacitor FU in phase line in polyphase ac circuit.
Compared with prior art, the beneficial effects of the present invention are embodied in:
The present invention carries out hardware controls using contactor, the time relay, soft start resistance and switch to realize, has control Structure processed is simple, and control circuit stability is strong, strong antijamming capability, and main circuit parameter is convenient for selection adjusting and adjusts, each component Select more flexible, the advantages that being easy to design of system integration.And soft start on-delay control circuit passes through the time relay Time setting is carried out, can flexibly be selected between 1s~99min99s, it is simple to operate.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the structural schematic diagram of main circuit in the present invention.
Fig. 3 is the structural schematic diagram of control circuit in the present invention.
Specific embodiment
As shown in Figure 1, the present invention includes main circuit and control circuit, wherein as shown in Fig. 2, main circuit includes in the present invention And the polyphase ac circuit of transformer electrical connection and respectively soft starting circuit corresponding with multiple every respectively phase alternating current circuits are soft Access has soft start resistance Rs in starting circuit, and access has capacitor FU in the phase line in polyphase ac circuit.
As shown in figure 3, access has contactor KM1, contactor KM2, the time time relay in control circuit in the present invention KT, switch SB1 and switch SB2;
Contactor KM1 includes contactor KM1 line packet, the normally opened auxiliary contact of contactor KM1 and multiple corresponds respectively Access the contactor KM1 main contacts in soft starting circuit;
Contactor KM2 includes contactor KM2 line packet, the normally opened auxiliary contact of contactor KM2, contactor KM2 first normally closed auxiliary Help contact, the second normally closed auxiliary contact of contactor KM2 and multiple each phases for corresponding access polyphase ac circuit respectively Contactor KM2 main contacts in line;
Time relay KT includes time relay KT line packet and the contact time relay KT;
Switch SB1, switch SB2, the first normally closed auxiliary contact of contactor KM2 and time relay KT line packet are sequentially connected shape At main road, one end that main road is located at switch SB1 is connect with phase line, and the other end is connect with zero curve;
The second normally closed auxiliary contact of contactor KM2 and contactor KM1 line packet are in turn connected to form the first branch, the first branch There is the section of the first normally closed auxiliary contact of contactor KM2 and time relay KT line packet in parallel with access in main road;
The normally opened auxiliary contact of contactor KM1, the contact time relay KT and contactor KM2 line packet are in turn connected to form Access has switch SB2, the first normally closed auxiliary contact of contactor KM2 and time relay KT in two branches, second branch and main road The section of line packet is in parallel, and the normally opened auxiliary contact of contactor KM1 are in parallel with switch SB2;
Access has the route of contactor KM2 main contacts to form third branch, and third branch connects with second branch The section of the normally opened auxiliary contact of tentaculum KM1 and the contact time relay KT is in parallel.
Polyphase ac circuit can be three-phase circuit in the present invention, and switch SB1 can be dynamic circuit breaker button switch, switch SB2 can switch for making button, and the starting principle process for carrying out soft start to transformer using the present invention is as follows:
(1) closure switch SB1;
(2) closure switch SB2;
(3) since the first normally closed auxiliary contact of contactor KM2 and the second normally closed auxiliary contact of contactor KM2 are closed, Contactor KM1 and time relay KT is powered, after contactor KM1 is powered, the normally opened auxiliary contact of contactor KM1 and contactor KM1 main contacts closure, i.e., so that electric current is via soft starting circuit inflow transformer, i.e., three-phase voltage passes through contactor KM1 and soft Starting resistance Rs is that transformer carries out being pre-charged soft;
(4) after time relay KT is powered, the contact time relay KT is closed after the delay time set, when Between relay KT contact closure, therefore the case where the normally opened auxiliary contact of contactor KM1 and the contact time relay KT are closed Under, contactor KM2 line packet is powered, so that contactor KM2 main contacts and the normally opened auxiliary contact of contactor KM2 are powered, contact Device KM2 main contacts bypasses contactor KM1 main contacts and soft start resistance, and Transformer Soft-Startup process terminates, and connects tentaculum KM2 Main contacts carries out normal power supply, contactor KM1 auxiliary contact closure, and contactor auxiliary contact KM1 bypasses switch SB2;
(5) after the normally opened auxiliary contact of contactor KM2 are powered, contactor KM2 line packet passes through switch SB1 and contactor KM2 Normally opened auxiliary contact (closed state) carry out continued power, and contactor KM2 main contacts is maintained to be in Operating In Persistent Current Mode state;
(6) contactor KM2 normally closed auxiliary contact (disconnection), contactor KM1 line packet power loss, time time relay KT line packet Power loss, contactor KM1 main contacts disconnect, and soft starting circuit disconnects, and contactor KM1 auxiliary contact and time relay contact are restored To original state (normally opened);
(7) switch SB1, contactor KM2 line packet power loss are disconnected, contactor KM2 main contacts disconnects, and transformer and multiphase are powered Naturally it disconnects, entire circuit is the state restored to before being powered.
Preferably, further including the by-pass switch K1 of switch SB2 in control circuit.The present invention can also pass through by-pass switch K1 carries out remote switching control, i.e., using by-pass switch K1 as the by-pass switch of switch SB2, the long-range by-pass switch K1 that controls is closed Close the starting process, it can be achieved that soft starting circuit.
Resistance value >=3U of soft start resistance Rs in the present inventionn/In, wherein In is transformer rated operational current virtual value, Un It is virtual value for network voltage.The rated operational current of contactor KM1 and contactor KM2 can there are many selections, such as contact The rated operational current of device KM2 should be greater than the rated operational current of transformer, and the rated current of contactor KM1 is that transformer is specified The 30% of electric current.

Claims (7)

1. a kind of novel micro-capacitance sensor control of soft device, which is characterized in that including main circuit and control circuit, the main electricity Road includes and the polyphase ac circuit of transformer electrical connection and soft start corresponding with multiple every respectively phase alternating current circuits respectively Circuit, access has soft start resistance Rs in the soft starting circuit;
Access has contactor KM1, contactor KM2, time time relay KT, switch SB1 and switch in the control circuit SB2;
The contactor KM1 includes contactor KM1 line packet, the normally opened auxiliary contact of contactor KM1 and multiple corresponds respectively Access the contactor KM1 main contacts in soft starting circuit;
The contactor KM2 includes contactor KM2 line packet, the normally opened auxiliary contact of contactor KM2, contactor KM2 first normally closed auxiliary Help contact, the second normally closed auxiliary contact of contactor KM2 and multiple each phases for corresponding access polyphase ac circuit respectively Contactor KM2 main contacts in line;
The time relay KT includes time relay KT line packet and the contact time relay KT;
The switch SB1, switch SB2, the first normally closed auxiliary contact of contactor KM2 and time relay KT line packet are sequentially connected shape At main road, one end that the main road is located at switch SB1 is connect with phase line, and the other end is connect with zero curve;
Second normally closed auxiliary contact of contactor KM2 and contactor KM1 line packet are in turn connected to form the first branch, and described first Branch has the section of the first normally closed auxiliary contact of contactor KM2 and time relay KT line packet in parallel with access in main road;
The normally opened auxiliary contact of the contactor KM1, the contact time relay KT and contactor KM2 line packet are in turn connected to form Access has switch SB2, the first normally closed auxiliary contact of contactor KM2 and time relay in two branches, the second branch and main road The section of device KT line packet is in parallel, and the normally opened auxiliary contact of contactor KM1 are in parallel with switch SB2;
Access has the route of contactor KM2 main contacts to form third branch, and the third branch connects with second branch The section of the normally opened auxiliary contact of tentaculum KM1 and the contact time relay KT is in parallel.
2. novel micro-capacitance sensor control of soft device as described in claim 1, which is characterized in that in the control circuit also By-pass switch K1 including switch SB2.
3. novel micro-capacitance sensor control of soft device as described in claim 1, which is characterized in that the soft start resistance Rs Resistance value >=3Un/In, wherein In is transformer rated operational current virtual value, and Un is that network voltage is virtual value.
4. novel micro-capacitance sensor control of soft device as described in claim 1, which is characterized in that the contactor KM2's Rated operational current should be greater than the rated operational current of transformer.
5. novel micro-capacitance sensor control of soft device as described in claim 1, which is characterized in that the polyphase ac circuit In phase line on access have fuse FU.
6. novel micro-capacitance sensor control of soft device as described in claim 1, which is characterized in that the polyphase ac circuit For three-phase circuit.
7. novel micro-capacitance sensor control of soft device as described in claim 1, which is characterized in that the contactor KM1's Rated current is the 30% of transformer rated current.
CN201811227367.1A 2018-10-22 2018-10-22 Novel micro-grid soft start control device Active CN109149652B (en)

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Application Number Priority Date Filing Date Title
CN201811227367.1A CN109149652B (en) 2018-10-22 2018-10-22 Novel micro-grid soft start control device

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Application Number Priority Date Filing Date Title
CN201811227367.1A CN109149652B (en) 2018-10-22 2018-10-22 Novel micro-grid soft start control device

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CN109149652A true CN109149652A (en) 2019-01-04
CN109149652B CN109149652B (en) 2024-01-16

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203617935U (en) * 2013-11-07 2014-05-28 广东申菱空调设备有限公司 Overload starting control device for low-power motor
CN205070854U (en) * 2015-10-29 2016-03-02 灵宝金源矿业股份有限公司 Motor start control circuit
CN207753619U (en) * 2017-12-28 2018-08-21 东莞市大忠电子有限公司 A kind of three-phase transformer soft starting circuit
CN209608349U (en) * 2018-10-22 2019-11-08 天合光能股份有限公司 Novel little electric wire netting control device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203617935U (en) * 2013-11-07 2014-05-28 广东申菱空调设备有限公司 Overload starting control device for low-power motor
CN205070854U (en) * 2015-10-29 2016-03-02 灵宝金源矿业股份有限公司 Motor start control circuit
CN207753619U (en) * 2017-12-28 2018-08-21 东莞市大忠电子有限公司 A kind of three-phase transformer soft starting circuit
CN209608349U (en) * 2018-10-22 2019-11-08 天合光能股份有限公司 Novel little electric wire netting control device

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