CN202333772U - Input protection device for photovoltaic grid-connected inverter - Google Patents
Input protection device for photovoltaic grid-connected inverter Download PDFInfo
- Publication number
- CN202333772U CN202333772U CN 201120432157 CN201120432157U CN202333772U CN 202333772 U CN202333772 U CN 202333772U CN 201120432157 CN201120432157 CN 201120432157 CN 201120432157 U CN201120432157 U CN 201120432157U CN 202333772 U CN202333772 U CN 202333772U
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- protection device
- input protection
- circuit breaker
- master board
- opening device
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Abstract
The utility model relates to an input protection device for a photovoltaic grid-connected inverter. The input protection device comprises a main control panel, a circuit breaker, a shunt device, a voltage transformer and a current sensor, wherein the main control panel is connected with the grid-connected inverter to output PWM (Pulse-Width Modulation) signals which are used for controlling the operation of the grid-connected inverter; the main control panel is used for monitoring the working state of the inverter through the voltage transformer and the current sensor, stopping the output of the PWM in case of over voltage and over current, controlling the on and off of the shunt device so as to allow the shunt device electromagnet to be absorbed with an armature, and disconnecting the circuit breaker through the action of a linkage mechanism. According to the input protection device provided by the utility model, when the over voltage is input, the connection between the photovoltaic grid-connected inverter and a solar panel is cut off, the problem that the backflow of the grid current occurs due to invalidation of an output contactor is avoided, and the safety of the equipment and personnel is ensured.
Description
Technical field
The utility model relates to a kind of Electrical Safety protective device, refers in particular to the input protection device of concentrated three-phase photovoltaic grid-connected inverting device.
Background technology
The three-phase photovoltaic grid-connected inverting device begins to be applied to medium-and-large-sized photovoltaic plant; The direct current that inverter sends solar panel converts to and the alternating current of electrical network with frequency, homophase; And the feed-in electrical network, under normal circumstances, input voltage generally can not surpass setting voltage value.When for example not possessing the condition of being incorporated into the power networks, inverter can block the control pwm signal but at some in particular cases; Export contactor simultaneously and can cut off and being connected of electrical network, but machine breaks down, when causing exporting the contactor control signal and losing efficacy; The output contactor can connect electrical network always; At this moment power network current can " pour in down a chimney " to solar panel through inverter, and cell panel is caused damage, can threaten maintenance personal's personal safety simultaneously.When thunderbolt, the situation that input voltage is higher than the inverter withstand voltage can be occurred in addition, also machine can be damaged." pour in down a chimney " for avoiding equipment to meet with the bad or power network current of crushing, a device must be set, when machine breaks down between solar panel and inverter; This device can break off being electrically connected of cell panel and inverter rapidly; D.C. contactor is installed additional, its shortcoming in general producer between circuit breaker and inverter: volume is big and cost an arm and a leg, especially the high power DC contactor; Have only minority overseas enterprise to produce, reduced product competitiveness.With existing a certain type is example, and only D.C. contactor just accounts for 3% of total cost.
Summary of the invention
To the problems referred to above, the problem that the utility model need solve provides a kind of input protection device that is applicable to the three-phase photovoltaic grid-connected inverting device.
The concrete scheme of the utility model is following: a kind of input protection device of photovoltaic combining inverter; Comprise master board and be series at solar panel and combining inverter between circuit breaker, said master board be connected with combining inverter output pwm signal to combining inverter work control; It is characterized in that: comprise shunt opening device, voltage transformer, current sensor; Said voltage transformer is parallel to solar panel two inputs, and current sensor is series at the solar panel negative input end, and said shunt opening device is connected with master board and is controlled by master board; Master board is through voltage transformer, current sensor monitoring inverter working condition; Overvoltage and overcurrent condition take place then stop PWM output; Control shunt opening device switch closure simultaneously, and then shunt opening device electromagnet and armature adhesive, circuit breaker cut off through the link gear action.
Concrete, said shunt opening device is installed in the dedicated slot of said circuit breaker, fixes through screw; Said current sensor is the current Hall transducer.
The said input protection device of the utility model is when the input overvoltage; Can cut off being connected of photovoltaic combining inverter and solar panel; In the time of can also avoiding because of output contactor control fails, " pouring in down a chimney " problem appears in power network current, has guaranteed equipment and personnel's safety.
Said input protection device only installs a shunt release additional in existing circuit breaker; This shunt release is contained in the dedicated slot of supporting circuit breaker, its magnet control line access control plate, and the shunt opening device is contained in the circuit breaker; Do not influence existing structure, do not increase the original system volume; And shunt release is with low cost, is merely 4% of D.C. contactor cost, has reduced the complete machine cost, has increased product market competitiveness.
Description of drawings
Fig. 1 is the utility model circuit theory sketch map;
Fig. 2 is said shunt opening device and circuit breaker scheme of installation.
Embodiment
For ease of it will be appreciated by those skilled in the art that the utility model is done further introduction below in conjunction with accompanying drawing.
With reference to Fig. 1, the utility model input protection device comprises circuit breaker 1, shunt opening device 2, voltage transformer 3, current Hall transducer 4, master board 5.Wherein, shunt opening device 2 releases are installed on the dedicated slot of circuit breaker 2.Voltage transformer 3 is parallel to solar panel two inputs; Current Hall transducer 4 is series at the solar panel negative input end, and the holding wire of the control line of shunt opening device 2, voltage transformer 3 and current Hall transducer 4 all inserts on the master board corresponding terminal.The control of shunt opening device 2 is to realize through the relay on-off in the master board.In case the connection of master board relay, shunt opening device 2 solenoids 27 and armature 26 adhesives just can promote the main contact 22 that release mechanisms 23 discharge circuit breakers through transmission mechanism 25, and then the cut-out circuit system play a protective role.
The input protection device operation principle of above-mentioned photovoltaic combining inverter is following: in input just often, the relay of control shunt opening device 2 breaks off circuit breaker 1 closure, system's operate as normal in the master board 5; When master board 5 detects system works voltage or electric current when surpassing threshold values through transducer 3 or 4; Block output pwm signal immediately; The relay of control shunt opening device 2 is connected in the master board simultaneously, and the shunt opening device promotes release mechanism through transmission mechanism and discharges main contact, and circuit breaker tripping breaks off; When inverter breaks down, when causing output AC contactor 6 to break off, master board at this moment 5 also can be blocked pwm signal immediately, connects shunt opening device 2, circuit breaker tripping is broken off and then the parting system circuit plays a protective role.
The foregoing description is the preferred version that the utility model is realized; And indefiniteness is exhaustive; The utility model can also have other variations under same idea; Need to prove that do not breaking away under the utility model design prerequisite, any conspicuous replacement and minor variations are all within the protection range of the utility model.
Claims (3)
1. the input protection device of a photovoltaic combining inverter, comprise master board and be series at solar panel and combining inverter between circuit breaker, said master board be connected with combining inverter output pwm signal to combining inverter work control; It is characterized in that: comprise shunt opening device, voltage transformer, current sensor; Said voltage transformer is parallel to solar panel two inputs, and current sensor is series at the solar panel negative input end, and said shunt opening device is connected with master board and is controlled by master board; Master board is through voltage transformer, current sensor monitoring inverter working condition; Overvoltage and overcurrent condition take place then stop PWM output; Control shunt opening device switch closure simultaneously, and then shunt opening device electromagnet and armature adhesive, circuit breaker cut off through the link gear action.
2. the input protection device of photovoltaic combining inverter according to claim 1, it is characterized in that: said shunt opening device is installed in the dedicated slot of said circuit breaker, fixes through screw.
3. the input protection device of photovoltaic combining inverter according to claim 1, it is characterized in that: said current sensor is the current Hall transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120432157 CN202333772U (en) | 2011-11-04 | 2011-11-04 | Input protection device for photovoltaic grid-connected inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120432157 CN202333772U (en) | 2011-11-04 | 2011-11-04 | Input protection device for photovoltaic grid-connected inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202333772U true CN202333772U (en) | 2012-07-11 |
Family
ID=46445738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120432157 Expired - Lifetime CN202333772U (en) | 2011-11-04 | 2011-11-04 | Input protection device for photovoltaic grid-connected inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202333772U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103490382A (en) * | 2013-09-09 | 2014-01-01 | 南京南瑞太阳能科技有限公司 | Grid connection safety device and control method for distributed photovoltaic power generation system |
| CN103606960A (en) * | 2013-12-12 | 2014-02-26 | 国网上海市电力公司 | Distributed photovoltaic power station/power distribution station 380V bus grid-integration structure |
| CN103618338A (en) * | 2013-12-12 | 2014-03-05 | 国网上海市电力公司 | Grid-connected access structure of distributed photovoltaic power station and 10-kV busbar of power distribution station |
| CN103618337A (en) * | 2013-12-12 | 2014-03-05 | 国网上海市电力公司 | Grid-connected access structure of distributed photovoltaic power station and 10-kV power grid overhead line |
| CN104113222A (en) * | 2014-07-04 | 2014-10-22 | 珠海格力电器股份有限公司 | Protection circuit of photovoltaic inverter |
| KR20150039767A (en) * | 2012-07-26 | 2015-04-13 | 엘렌베르거 앤드 포엔스겐 게엠베하 | Device for the safe switching of a photovoltaic system |
| CN104685749A (en) * | 2012-10-01 | 2015-06-03 | 罗伯特·博世有限公司 | Circuit configuration with an inverter |
| CN105098732A (en) * | 2015-08-19 | 2015-11-25 | 广东明阳龙源电力电子有限公司 | Auxiliary protection device and method for industrial power electronic equipment |
| US10411459B2 (en) | 2016-08-23 | 2019-09-10 | Delta Electronics (Shanghai) Co., Ltd | Photovoltaic power generation system and method for shutting down the same |
-
2011
- 2011-11-04 CN CN 201120432157 patent/CN202333772U/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150039767A (en) * | 2012-07-26 | 2015-04-13 | 엘렌베르거 앤드 포엔스겐 게엠베하 | Device for the safe switching of a photovoltaic system |
| KR101663195B1 (en) | 2012-07-26 | 2016-10-06 | 엘렌베르거 앤드 포엔스겐 게엠베하 | Device for the safe switching of a photovoltaic system |
| CN104685749B (en) * | 2012-10-01 | 2019-02-15 | 罗伯特·博世有限公司 | Circuit device with inverter |
| CN104685749A (en) * | 2012-10-01 | 2015-06-03 | 罗伯特·博世有限公司 | Circuit configuration with an inverter |
| CN103490382A (en) * | 2013-09-09 | 2014-01-01 | 南京南瑞太阳能科技有限公司 | Grid connection safety device and control method for distributed photovoltaic power generation system |
| CN103618337A (en) * | 2013-12-12 | 2014-03-05 | 国网上海市电力公司 | Grid-connected access structure of distributed photovoltaic power station and 10-kV power grid overhead line |
| CN103618338B (en) * | 2013-12-12 | 2016-03-23 | 国网上海市电力公司 | The grid integration structure of a kind of distributed photovoltaic power station and power distribution station 10kV bus |
| CN103618337B (en) * | 2013-12-12 | 2016-03-23 | 国网上海市电力公司 | The grid integration structure of a kind of distributed photovoltaic power station and 10kV electrical network overhead transmission line |
| CN103618338A (en) * | 2013-12-12 | 2014-03-05 | 国网上海市电力公司 | Grid-connected access structure of distributed photovoltaic power station and 10-kV busbar of power distribution station |
| CN103606960A (en) * | 2013-12-12 | 2014-02-26 | 国网上海市电力公司 | Distributed photovoltaic power station/power distribution station 380V bus grid-integration structure |
| CN104113222A (en) * | 2014-07-04 | 2014-10-22 | 珠海格力电器股份有限公司 | Protection circuit of photovoltaic inverter |
| CN105098732A (en) * | 2015-08-19 | 2015-11-25 | 广东明阳龙源电力电子有限公司 | Auxiliary protection device and method for industrial power electronic equipment |
| US10411459B2 (en) | 2016-08-23 | 2019-09-10 | Delta Electronics (Shanghai) Co., Ltd | Photovoltaic power generation system and method for shutting down the same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120711 |
|
| CX01 | Expiry of patent term |