CN105021977A - AC relay detection method and system before grid connection of photovoltaic inverter - Google Patents
AC relay detection method and system before grid connection of photovoltaic inverter Download PDFInfo
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- CN105021977A CN105021977A CN201410182474.2A CN201410182474A CN105021977A CN 105021977 A CN105021977 A CN 105021977A CN 201410182474 A CN201410182474 A CN 201410182474A CN 105021977 A CN105021977 A CN 105021977A
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Abstract
The application discloses an AC relay detection method and system before the grid connection of a photovoltaic inverter, wherein the method comprises the steps of: connecting a relay set in series between the output terminal of a photovoltaic inverter and a power grid; and breaking the connection between a relay to be detected and the output terminal of the photovoltaic inverter or the power grid, controlling the work state of the relay to be detected, respectively sampling a power grid voltage or an inverter voltage after the series connection of the relay to be detected, and determining whether the relay to be detected has faults according to sampled voltages. The method can detect relays with faults in the relay set before the grid connection of the photovoltaic inverter, thereby guaranteeing the effective grid connection or disconnection between the photovoltaic inverter and the power grid, improving the security and reliability of a photovoltaic power generation system, and meanwhile facilitating maintenance work.
Description
Technical field
The application relates to field of photovoltaic power generation, is specifically related to AC relay detection method and system before a kind of photovoltaic inverter grid-connected.
Background technology
In grid-connected photovoltaic system, the converting direct-current power into alternating-current power that photovoltaic array or photovoltaic combiner box export by photovoltaic DC-to-AC converter, is then transferred in electrical network.In order to ensure the security of system, the live wire usually between photovoltaic DC-to-AC converter output terminal and electrical network and zero line all arranging AC relay, facilitating photovoltaic generating system and the connection of electrical network and the control of disconnection simultaneously.
Present stage most of 1-15KW photovoltaic DC-to-AC converter AC use AC relay is connected with electrical network, but the situation that AC relay may break down in During Process of Long-term Operation, photovoltaic inverting system can not effectively and electrical network grid-connected, or effectively can not disconnect the connection with electrical network, there is potential safety hazard.
Summary of the invention
The application provides AC relay detection method and system before a kind of photovoltaic inverter grid-connected, uses the method can detect the AC relay that there is fault.
According to the first aspect of the application, AC relay detection method before a kind of photovoltaic inverter grid-connected is provided, comprises:
Relay group is connected in series between photovoltaic DC-to-AC converter output terminal and electrical network;
Disconnect the connection of relay to be detected and photovoltaic DC-to-AC converter output terminal or electrical network, control the duty of relay to be detected, by the voltage of sampling, line voltage after the relay to be detected of sampling serial connection respectively or inverter voltage, judge whether relay to be detected exists fault.
In one embodiment, between photovoltaic DC-to-AC converter output terminal and electrical network, be connected in series relay group, specifically comprise:
Be connected on the live wire between photovoltaic DC-to-AC converter output terminal and electrical network after first relay and the 3rd relay are connected, first node is between the first relay and the 3rd relay, be connected on after second relay and the 4th relay being connected on the zero line between photovoltaic DC-to-AC converter output terminal and electrical network, Section Point is between the second relay and the 4th relay;
Disconnect the connection of relay to be detected and photovoltaic DC-to-AC converter output terminal or electrical network, control the duty of relay to be detected, by the voltage of sampling, line voltage after the relay to be detected of sampling serial connection respectively or inverter voltage, judge whether relay to be detected exists fault, specifically comprises:
Control disconnection first relay and the second relay, adhesive the 3rd relay and the 4th relay, the first voltage between sampling first node and Section Point also compares with line voltage, if the first voltage is equal with line voltage, then the 3rd relay and the 4th relay adhesive normal; Otherwise the 3rd relay and/or the 4th relay adhesive fault.
Further, disconnect the connection of relay to be detected and photovoltaic DC-to-AC converter output terminal or electrical network, control the duty of relay to be detected, line voltage after the relay to be detected of sampling serial connection respectively or inverter voltage, judge whether relay to be detected exists fault, also comprises by the voltage of sampling:
If the 3rd relay and the 4th relay adhesive are normally, disconnect the 3rd relay, and the second voltage between first node and Section Point of sampling;
Judge whether the second voltage is zero, if be zero, then the 3rd relay disconnects normal, otherwise the 3rd relay open failure;
Adhesive the 3rd relay, disconnects the 4th relay, and the tertiary voltage between first node and Section Point of sampling;
Judge whether tertiary voltage is zero, if be zero, then the 4th relay disconnects normal, otherwise the 4th relay open failure.
Further, disconnect the connection of relay to be detected and photovoltaic DC-to-AC converter output terminal or electrical network, control the duty of relay to be detected, line voltage after the relay to be detected of sampling serial connection respectively or inverter voltage, judge whether relay to be detected exists fault, also comprises by the voltage of sampling:
Disconnect the 3rd relay and the 4th relay, adhesive first relay and the second relay, the 4th voltage between sampling first node and Section Point also compares with inverter voltage, judge that whether the 4th voltage is equal with inverter voltage, if equal, then the first relay and the second relay adhesive normal; Otherwise, the first relay and/or the second relay adhesive fault.
Further, disconnect the connection of relay to be detected and photovoltaic DC-to-AC converter output terminal or electrical network, control the duty of relay to be detected, line voltage after the relay to be detected of sampling serial connection respectively or inverter voltage, judge whether relay to be detected exists fault, also comprises by the voltage of sampling:
If the first relay and the second relay adhesive are normally, disconnect the second relay, the 5th voltage between sampling first node and Section Point;
Judge whether the 5th voltage is zero, if be zero, then the second relay disconnects normal, otherwise the second relay open failure;
Adhesive second relay, disconnects the first relay, the 6th voltage between sampling first node and Section Point;
Judge whether the 6th voltage is zero, if be zero, then the first relay disconnects normal, otherwise the first relay open failure.
According to the second aspect of the application, provide a kind of photovoltaic inverter system, comprise photovoltaic DC-to-AC converter, relay group and processor;
Relay group one end is connected with photovoltaic DC-to-AC converter output terminal, processor is used for when disconnecting the connection of relay to be detected and photovoltaic DC-to-AC converter output terminal or electrical network, the duty of relay and photovoltaic DC-to-AC converter in pilot relay group, and sampling serial connection relay to be detected after line voltage or inverter voltage, by sampling voltage judge whether relay to be detected exists fault.
In one embodiment, relay group comprises the first relay, the second relay, the 3rd relay and the 4th relay;
Be connected on the live wire of photovoltaic DC-to-AC converter output terminal after first relay and the series connection of the 3rd relay, first node is between the first relay and the 3rd relay, be connected on photovoltaic DC-to-AC converter output terminal zero line after second relay and the series connection of the 4th relay, Section Point is between the second relay and the 4th relay, processor is for controlling disconnection first relay and the first relay, adhesive the 3rd relay and the 4th relay, the first voltage between sampling first node and the 3rd node also compares with line voltage, if the first voltage is equal with line voltage, then judge the 3rd relay and the 4th relay adhesive normal, otherwise judge the 3rd relay and/or the 4th relay adhesive fault.
Further, processor also for the 3rd relay and the 4th relay adhesive normal time, control disconnection the 3rd relay, and second voltage of sampling between first node and Section Point judge whether the second voltage is zero, if be zero, then judge that the 3rd relay disconnects normal, otherwise the 3rd relay open failure; Control adhesive the 3rd relay, disconnect the 4th relay, and the tertiary voltage of sampling between first node and Section Point judge whether tertiary voltage is zero, if be zero, then judge that the 4th relay disconnects normal, otherwise judge the 4th relay open failure.
Further, processor is also for controlling disconnection the 3rd relay and the 4th relay, adhesive first relay and the second relay, the 4th voltage between sampling first node and Section Point also compares with inverter voltage, judge that whether the 4th voltage is equal with inverter voltage, if equal, then judge the first relay and the second relay adhesive normal; Otherwise, judge the first relay and/or the second relay adhesive fault.
Further, processor also for the first relay and the second relay adhesive normal, control disconnection second relay, the 5th voltage between sampling first node and Section Point also judges whether the 5th voltage is zero, if be zero, then judge that the second relay disconnects normal, otherwise the second relay open failure; Control adhesive second relay, disconnect the first relay, the 6th voltage between sampling first node and Section Point also judges whether the 6th voltage is zero, if be zero, then judge that the first relay disconnects normal, otherwise judges the first relay open failure.
The beneficial effect of the application is:
In a kind of embodiment of the application, before photovoltaic inverter grid-connected, AC relay detection method comprises, and is connected in series relay group between photovoltaic DC-to-AC converter output terminal and electrical network; Disconnect the connection of relay to be detected and photovoltaic DC-to-AC converter output terminal or electrical network, control the duty of relay to be detected, by the voltage of sampling, line voltage after the relay to be detected of sampling serial connection respectively or inverter voltage, judge whether relay to be detected exists fault.The method of the application can detect the relay that there is fault in relay group before photovoltaic inverter grid-connected, thus ensure that photovoltaic DC-to-AC converter is effective and electrical network is grid-connected or disconnect, improve the safety and reliability of photovoltaic generating system, facilitate maintenance work simultaneously.
Accompanying drawing explanation
Fig. 1 is AC relay detection method process flow diagram before photovoltaic inverter grid-connected in a kind of embodiment;
Fig. 2 is AC relay detection method process flow diagram before photovoltaic inverter grid-connected in the second embodiment;
Fig. 3 is AC relay detection method process flow diagram before photovoltaic inverter grid-connected in the third embodiment;
Fig. 4 is the structured flowchart of AC relay detection system before photovoltaic inverter grid-connected in a kind of embodiment.
Embodiment
By reference to the accompanying drawings the present invention is described in further detail below by embodiment.
Embodiment one:
Please refer to Fig. 1, before the photovoltaic inverter grid-connected of the present embodiment, AC relay detection method comprises step:
101: between photovoltaic DC-to-AC converter output terminal and electrical network, be connected in series relay group.Live wire between photovoltaic DC-to-AC converter output terminal and electrical network and zero line are connected in series relay respectively, form relay group.
102: the connection disconnecting relay to be detected and photovoltaic DC-to-AC converter output terminal or electrical network, control the duty of relay to be detected, by the voltage of sampling, line voltage after the relay to be detected of sampling serial connection respectively or inverter voltage, judge whether relay to be detected exists fault.
When comprising 2 AC relay in relay group, disconnect relay to be detected and photovoltaic DC-to-AC converter output terminal or electrical network is wherein arbitrary is connected, such as can disconnect the connection with photovoltaic DC-to-AC converter output terminal, first control relay adhesive to be detected, by measuring the voltage after being connected in series relay to be detected and comparing with line voltage, detect relay to be detected and whether there is adhesive fault, under the prerequisite without adhesive fault, control relay to be detected and be in different operating state, by the voltage recorded after being connected in series relay to be detected, judge whether relay to be detected exists open failure, when comprising the AC relay of more than 4 in relay group, using the relay of 2 on zero line and live wire as one group of relay to be detected, from detecting relay to be detected successively outside to inside, the detection to relay group can be completed equally.
The method of the application can detect the relay that there is fault in relay group before photovoltaic inverter grid-connected, thus ensure that photovoltaic DC-to-AC converter is effective and electrical network is grid-connected or disconnect, improve the safety and reliability of photovoltaic generating system, facilitate maintenance work simultaneously.
Embodiment two:
Please refer to Fig. 2, before the photovoltaic inverter grid-connected of the present embodiment, AC relay detection method comprises the following steps:
201: the first relays and the 3rd relay are connected on the live wire between photovoltaic DC-to-AC converter output terminal and electrical network after connecting, first node A is between the first relay and the 3rd relay, second relay and the 4th relay are connected on after connecting on the zero line between photovoltaic DC-to-AC converter output terminal and electrical network, and Section Point B is between the second relay and the 4th relay;
202: disconnect the first relay and the second relay, adhesive the 3rd relay and the 4th relay, the voltage between sampled measurements first node A and Section Point B and with line voltage V
0relatively, judge whether the 3rd relay and the 4th relay exist adhesive fault; If voltage and V between A, B
0equal, then adhesive is normal, otherwise the 3rd relay and/or the 4th relay adhesive fault.
203: if the 3rd relay and the 4th relay adhesive normal, control the 3rd relay and the 4th relay is in different duties, namely in the 3rd relay and the 4th relay one be attracting state, another is off state, measure whether voltage between first node A and Section Point B is zero respectively, judge whether the 3rd relay and the 4th relay exist open failure.If between A, B, voltage is zero in two kinds of situations, then the 3rd relay and the 4th relay disconnect normal, if between A, B there is non-vanishing situation in voltage, then and the 3rd relay and/or the 4th relay open failure.
204: disconnect the 3rd relay and the 4th relay, adhesive first relay and the second relay, the voltage between sampling first node A and Section Point B and with inverter voltage V
urelatively, judge whether the first relay and the second relay exist adhesive fault; If voltage and V between A, B
uequal, then adhesive is normal, otherwise the 3rd relay and/or the 4th relay adhesive fault.
205: if the first relay and the second relay adhesive normal, control the first relay and the second relay is in different duties, namely in the first relay and the second relay one be attracting state, another is off state, measure whether voltage between first node A and Section Point B is zero respectively, judge whether the first relay and the second relay exist open failure.If between A, B, voltage is zero in two kinds of situations, then the first relay and the second relay disconnect normal, if between A, B there is non-vanishing situation in voltage, then and the first relay and/or the second relay open failure.
It should be noted that, detection method in present embodiment, first have detected the 3rd relay and whether the 4th relay exists fault, and then detect the first relay and whether the second relay exists fault, in other embodiments, also can first first relay and the second relay, and then detect the 3rd relay and whether the 4th relay exists fault.In addition, the line voltage V in present embodiment
0with inverter voltage V
uwhat adopt is Systems Theory value.
Method in the present embodiment, before photovoltaic inverter grid-connected, fault detect is carried out to the first relay, the second relay, the 3rd relay and the 4th relay, adhesive and the open failure of relay can be detected, thus ensure that photovoltaic DC-to-AC converter is effective and electrical network is grid-connected or disconnect, improve the safety and reliability of photovoltaic generating system, also facilitate maintenance work simultaneously.
Embodiment three:
Please refer to Fig. 3, before the photovoltaic inverter grid-connected in the present embodiment, AC relay detection method comprises:
301: measure inverter voltage V
uwith line voltage V
0be connected on the live wire between photovoltaic DC-to-AC converter output terminal and electrical network after first relay and the 3rd relay are connected, first node A is between the first relay and the 3rd relay, second relay and the 4th relay are connected on after connecting on the zero line between photovoltaic DC-to-AC converter output terminal and electrical network, and Section Point B is between the second relay and the 4th relay; First relay, the second relay, the 3rd relay and the 4th relay are AC relay.
302: control disconnection first relay and the second relay, adhesive the 3rd relay and the 4th relay, and to the first voltage V between first node A and Section Point B
1sampling;
303: compare the first voltage V
1with line voltage V
0if, the first voltage V
1with line voltage V
0unequal, then point out the 3rd relay and/or the 4th relay adhesive fault; If the first voltage V
1with line voltage V
0equal, then processor controls disconnection the 3rd relay, and the second voltage V between first node A and Section Point B that samples
2;
304: judge the second voltage V
2whether be zero, if be zero, then the 3rd relay disconnects normal, otherwise the 3rd relay open failure, processor provides alarm;
305: control adhesive the 3rd relay, disconnect the 4th relay, and the tertiary voltage V between first node A and Section Point B that samples
3;
306: judge tertiary voltage V
3whether be zero, if be zero, then the 4th relay disconnects normal, otherwise the 4th relay open failure, processor provides alerting signal;
307: control disconnection the 3rd relay and the 4th relay, adhesive first relay and the second relay,
308: control photovoltaic DC-to-AC converter and start working, the 4th voltage V between sampling first node A and Section Point B
4;
309: judge the 4th voltage V
4whether with inverter voltage V
uequal, if unequal, then the first relay and/or the second relay adhesive fault, processor alarm; If equal, normally, now adhesive first relay, disconnects the second relay for the first relay and the second relay adhesive, the 5th voltage V between sampling first node A and Section Point B
5;
310: judge the 5th voltage V
5whether be zero, if be that the zero, second relay disconnects normally, otherwise the second relay open failure, processor provides alerting signal;
311: adhesive second relay, disconnects the first relay, the 6th voltage V between sampling first node A and Section Point B
6;
312: judge the 6th voltage V
6whether be zero, if be zero, then the first relay disconnects normal, otherwise the first relay open failure, processor provides alerting signal.
In the present embodiment, the first relay, the second relay, the 3rd relay and the 4th relay open failure time, provide different alarms, to distinguish different relay faults; 3rd relay and/or the 4th relay generation adhesive fault, the first relay and/or the second relay generation adhesive fault also adopt different alarm modes.
Use the method in the present embodiment, the relay that there is fault can be detected before photovoltaic inverter grid-connected, and different alarms can be provided according to relay fault.
Embodiment four:
The present embodiment provides a kind of photovoltaic inverter system, comprises photovoltaic DC-to-AC converter, relay group and processor.Relay group one end is connected with photovoltaic DC-to-AC converter output terminal, and during use, the relay group other end is connected on electrical network.Processor is used for when disconnecting the connection of relay to be detected and photovoltaic DC-to-AC converter output terminal or electrical network, the duty of relay and photovoltaic DC-to-AC converter in pilot relay group, and sampling serial connection relay to be detected after line voltage or inverter voltage, by sampling voltage judge whether relay to be detected exists fault.
Relay is serially connected on live wire between photovoltaic DC-to-AC converter output terminal and electrical network and zero line and forms relay group.When comprising 2 relays in relay group, disconnect relay to be detected and photovoltaic DC-to-AC converter output terminal or electrical network is wherein arbitrary is connected, first control relay adhesive to be detected, by the line voltage after sampling serial connection relay to be detected or inverter voltage, detect relay to be detected and whether there is adhesive fault, under the prerequisite without adhesive fault, control relay to be detected and be in different operating state, whether the voltage be connected in series after relay to be detected by measurement is zero, judges whether relay to be detected exists open failure; When comprising the relay of more than 4 in relay group, using the relay of 2 on zero line and live wire as one group of relay to be detected, from detecting relay to be detected successively outside to inside, the detection to relay group can be completed equally.In addition, in order to improve the reliability of system, live wire between inverter output end and electrical network and zero line can also adopt respectively the mode of multiple relay parallel connection, like this during one of them relay fault, other relays can be used to substitute.
It should be noted that, in the relay group using the application method in theory, the number of relay can be any even number, but when comprising 2 relays in relay group, in order to detect relay fault, disconnecting when single relay is connected with photovoltaic DC-to-AC converter output terminal or electrical network and there is potential safety hazard (such as only disconnecting the relay on zero line); When comprising in relay group more than 4 relays, cost high and increase energy consumption, therefore preferably include 4 relays in relay group.
The system of the present embodiment can detect the relay that there is fault in relay group before photovoltaic inverter grid-connected, thus ensure that photovoltaic DC-to-AC converter is effective and electrical network is grid-connected or disconnect, improve the safety and reliability of photovoltaic generating system, facilitate maintenance work simultaneously.
Embodiment five:
Please refer to Fig. 4, the present embodiment provides a kind of photovoltaic inverter system, comprise photovoltaic DC-to-AC converter 405, first relay 401, second relay 402, the 3rd relay 403, the 4th relay 404 and processor 407, first relay 401 and the 3rd relay 403 connect after the first relay 401 receive on photovoltaic DC-to-AC converter 405 output terminal live wire, during use, the other end of the 3rd relay 403 is received on the live wire of electrical network 406, and first node is between the first relay 401 and the 3rd relay 403.Receive on the zero line of photovoltaic DC-to-AC converter 405 output terminal after second relay 402 and the series connection of the 4th relay 404, when system uses, the other end of the 3rd relay 403 is received on the zero line of electrical network 406, and Section Point is between the second relay 402 and the 4th relay 404.Photovoltaic DC-to-AC converter 405 comprises input end, and when photovoltaic DC-to-AC converter 405 is isolated form photovoltaic DC-to-AC converter, its input end can directly be received on photovoltaic module or photovoltaic combiner box; When photovoltaic DC-to-AC converter 405 is non-isolation type photovoltaic DC-to-AC converter, need to increase booster circuit between photovoltaic DC-to-AC converter 405 and photovoltaic module, simultaneously can at photovoltaic DC-to-AC converter 405 two ends flying capcitor, to improve the stability of output voltage.Processor 407 for controlling disconnection first relay 401 and the first relay 401, adhesive the 3rd relay 403 and the 4th relay 404, sampling first node and the 3rd node between the first voltage V
1and with line voltage V
0relatively, if the first voltage V
1with line voltage V
0equal, then judge the 3rd relay 403 and the 4th relay 404 adhesive normal; Otherwise judge the 3rd relay 403 and/or the 4th relay 404 adhesive fault.In one embodiment, processor is also for measuring line voltage V
0with inverter voltage V
u.
Further, processor also for the 3rd relay 403 and the 4th relay 404 adhesive normal time, control disconnection the 3rd relay 403, and the second voltage V between first node and Section Point that samples
2and judge the second voltage V
2whether be zero, if be zero, then judge that the 3rd relay 403 disconnects normally, otherwise the 3rd relay 403 open failure; Control adhesive the 3rd relay 403, disconnect the 4th relay 404, and the tertiary voltage V between first node and Section Point that samples
3and judge tertiary voltage V
3whether be zero, if be zero, then judge that the 4th relay 404 disconnects normally, otherwise judge the 4th relay 404 open failure.
Further, processor also for controlling disconnection the 3rd relay 403 and the 4th relay 404, adhesive first relay 401 and the second relay 402, sampling first node and Section Point between the 4th voltage V
4and with inverter voltage V
urelatively, the 4th voltage V is judged
4whether with inverter voltage V
uequal, if equal, then judge the first relay 401 and the second relay 402 adhesive normal; Otherwise, judge the first relay 401 and/or the second relay 402 adhesive fault.
Further, processor also for normal in the first relay 401 and the second relay 402 adhesive, controls disconnection second relay 402, the 5th voltage V between sampling first node and Section Point
5and judge the 5th voltage V
5whether be zero, if be zero, then judge that the second relay 402 disconnects normally, otherwise the second relay 402 open failure; Control adhesive second relay 402, disconnect the first relay 401, the 6th voltage V between sampling first node and Section Point
6and judge the 6th voltage V
6whether be zero, if be zero, then judge that the first relay 401 disconnects normally, otherwise judge the first relay 401 open failure.
Above content is the further description done the application in conjunction with concrete embodiment, can not assert that the concrete enforcement of the application is confined to these explanations.For the application person of an ordinary skill in the technical field, under the prerequisite not departing from the application's design, some simple deduction or replace can also be made.
Claims (10)
1. an AC relay detection method before photovoltaic inverter grid-connected, is characterized in that, comprising:
Relay group is connected in series between photovoltaic DC-to-AC converter output terminal and electrical network;
Disconnect the connection of relay to be detected and photovoltaic DC-to-AC converter output terminal or electrical network, control the duty of relay to be detected, by the voltage of sampling, line voltage after the relay to be detected of sampling serial connection respectively or inverter voltage, judge whether relay to be detected exists fault.
2. the method for claim 1, is characterized in that, describedly between photovoltaic DC-to-AC converter output terminal and electrical network, is connected in series relay group, specifically comprises:
Be connected on the live wire between photovoltaic DC-to-AC converter output terminal and electrical network after first relay and the 3rd relay are connected, first node is between the first relay and the 3rd relay, be connected on after second relay and the 4th relay being connected on the zero line between photovoltaic DC-to-AC converter output terminal and electrical network, Section Point is between the second relay and the 4th relay;
The connection of described disconnection relay to be detected and photovoltaic DC-to-AC converter output terminal or electrical network, control the duty of relay to be detected, by the voltage of sampling, line voltage after the relay to be detected of sampling serial connection respectively or inverter voltage, judge whether relay to be detected exists fault, specifically comprises:
Control disconnection first relay and the second relay, adhesive the 3rd relay and the 4th relay, the first voltage between sampling first node and Section Point also compares with line voltage, if described first voltage is equal with line voltage, then described 3rd relay and the 4th relay adhesive normal; Otherwise described 3rd relay and/or the 4th relay adhesive fault.
3. method as claimed in claim 2, it is characterized in that, the connection of described disconnection relay to be detected and photovoltaic DC-to-AC converter output terminal or electrical network, control the duty of relay to be detected, line voltage after the relay to be detected of sampling serial connection respectively or inverter voltage, judge whether relay to be detected exists fault, also comprises by the voltage of sampling:
If described 3rd relay and the 4th relay adhesive are normally, disconnect the 3rd relay, and the second voltage between described first node and described Section Point of sampling;
Judge whether described second voltage is zero, if be zero, then the 3rd relay disconnects normal, otherwise the 3rd relay open failure;
Adhesive the 3rd relay, disconnects the 4th relay, and the tertiary voltage between first node and Section Point of sampling;
Judge whether described tertiary voltage is zero, if be zero, then the 4th relay disconnects normal, otherwise the 4th relay open failure.
4. method as claimed in claim 3, it is characterized in that, the connection of described disconnection relay to be detected and photovoltaic DC-to-AC converter output terminal or electrical network, control the duty of relay to be detected, line voltage after the relay to be detected of sampling serial connection respectively or inverter voltage, judge whether relay to be detected exists fault, also comprises by the voltage of sampling:
Disconnect the 3rd relay and the 4th relay, adhesive first relay and the second relay, to sample the 4th voltage between described first node and Section Point comparing with inverter voltage, judge that whether described 4th voltage is equal with inverter voltage, if equal, then described first relay and the second relay adhesive normal; Otherwise, described first relay and/or described second relay adhesive fault.
5. method as claimed in claim 4, it is characterized in that, the connection of described disconnection relay to be detected and photovoltaic DC-to-AC converter output terminal or electrical network, control the duty of relay to be detected, line voltage after the relay to be detected of sampling serial connection respectively or inverter voltage, judge whether relay to be detected exists fault, also comprises by the voltage of sampling:
If the first relay and the second relay adhesive are normally, disconnect the second relay, the 5th voltage of sampling between described first node and Section Point;
Judge whether described 5th voltage is zero, if be zero, then the second relay disconnects normal, otherwise the second relay open failure;
Adhesive second relay, disconnects the first relay, the 6th voltage of sampling between described first node and Section Point;
Judge whether described 6th voltage is zero, if be zero, then the first relay disconnects normal, otherwise the first relay open failure.
6. a photovoltaic inverter system, is characterized in that, comprises photovoltaic DC-to-AC converter, relay group and processor;
Described relay group one end is connected with described photovoltaic DC-to-AC converter output terminal, described processor is used for when disconnecting the connection of relay to be detected and photovoltaic DC-to-AC converter output terminal or electrical network, control the duty of relay and photovoltaic DC-to-AC converter in described relay group, and sampling serial connection relay to be detected after line voltage or inverter voltage, by sampling voltage judge whether relay to be detected exists fault.
7. system as claimed in claim 6, it is characterized in that, described relay group comprises the first relay, the second relay, the 3rd relay and the 4th relay;
Be connected on the live wire of described photovoltaic DC-to-AC converter output terminal after described first relay and described 3rd relay series connection, first node is between described first relay and described 3rd relay, be connected on described photovoltaic DC-to-AC converter output terminal zero line after described second relay and described 4th relay series connection, Section Point is between described second relay and the 4th relay, described processor is for controlling disconnection first relay and the first relay, adhesive the 3rd relay and the 4th relay, the first voltage between sampling first node and the 3rd node also compares with line voltage, if described first voltage is equal with line voltage, then judge described 3rd relay and the 4th relay adhesive normal, otherwise judge described 3rd relay and/or the 4th relay adhesive fault.
8. system as claimed in claim 7, it is characterized in that, described processor also for described 3rd relay and the 4th relay adhesive normal time, control disconnection the 3rd relay, and second voltage of sampling between described first node and described Section Point judge whether described second voltage is zero, if be zero, then judge that described 3rd relay disconnects normal, otherwise the 3rd relay open failure; Control adhesive the 3rd relay, disconnect the 4th relay, and the tertiary voltage of sampling between first node and Section Point judge whether tertiary voltage is zero, if be zero, then judge that described 4th relay disconnects normal, otherwise judge the 4th relay open failure.
9. system as claimed in claim 8, it is characterized in that, described processor is also for controlling disconnection the 3rd relay and the 4th relay, adhesive first relay and the second relay, to sample the 4th voltage between described first node and Section Point comparing with inverter voltage, judge that whether described 4th voltage equal with inverter voltage, if equal, then judge described first relay and the second relay adhesive normal; Otherwise, judge described first relay and/or described second relay adhesive fault.
10. system as claimed in claim 9, it is characterized in that, described processor also for described first relay and the second relay adhesive normal, control disconnection second relay, to sample the 5th voltage between described first node and Section Point judge whether described 5th voltage is zero, if be zero, then judge that described second relay disconnects normal, otherwise the second relay open failure; Control adhesive second relay, disconnect the first relay, the 6th voltage between described first node and Section Point judge whether described 6th voltage is zero, if be zero of sampling, then judge that described first relay disconnects normal, otherwise judge the first relay open failure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410182474.2A CN105021977A (en) | 2014-04-30 | 2014-04-30 | AC relay detection method and system before grid connection of photovoltaic inverter |
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| CN108303644A (en) * | 2018-01-23 | 2018-07-20 | 艾思玛新能源技术（上海）有限公司苏州高新区分公司 | The abatement detecting method of inverter repeat circuit |
| CN108363000A (en) * | 2018-01-23 | 2018-08-03 | 艾思玛新能源技术（上海）有限公司苏州高新区分公司 | A kind of abatement detecting method of inverter repeat circuit |
| CN109490766A (en) * | 2018-10-12 | 2019-03-19 | 易事特集团股份有限公司 | The relay test method of light storage mixing inverter |
| CN109946599A (en) * | 2019-03-28 | 2019-06-28 | 爱士惟新能源技术(江苏)有限公司 | The grid-connected preceding relay test method and device of photovoltaic three-phase inverter, storage medium |
| CN110412456A (en) * | 2019-07-12 | 2019-11-05 | 爱士惟新能源技术(江苏)有限公司 | A kind of the relay fault detection method and photovoltaic energy storage system of photovoltaic energy storage system |
| CN110441683A (en) * | 2019-09-17 | 2019-11-12 | 阳光电源（上海）有限公司 | Energy storage inverter and its controller |
| CN111521928A (en) * | 2020-04-28 | 2020-08-11 | 阳光电源股份有限公司 | Grid-connected switch failure detection method and system of three-phase inverter |
| CN112415377A (en) * | 2021-01-21 | 2021-02-26 | 浙江艾罗网络能源技术股份有限公司 | Three-phase grid-connected inverter relay failure detection method |
| CN112924855A (en) * | 2019-12-06 | 2021-06-08 | 苏州阿特斯阳光电力科技有限公司 | Grid-connected relay circuit |
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| CN109946599A (en) * | 2019-03-28 | 2019-06-28 | 爱士惟新能源技术(江苏)有限公司 | The grid-connected preceding relay test method and device of photovoltaic three-phase inverter, storage medium |
| CN110412456A (en) * | 2019-07-12 | 2019-11-05 | 爱士惟新能源技术(江苏)有限公司 | A kind of the relay fault detection method and photovoltaic energy storage system of photovoltaic energy storage system |
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| CN112924855B (en) * | 2019-12-06 | 2023-01-31 | 苏州阿特斯阳光电力科技有限公司 | Grid-connected relay circuit |
| CN111521928A (en) * | 2020-04-28 | 2020-08-11 | 阳光电源股份有限公司 | Grid-connected switch failure detection method and system of three-phase inverter |
| CN112415377A (en) * | 2021-01-21 | 2021-02-26 | 浙江艾罗网络能源技术股份有限公司 | Three-phase grid-connected inverter relay failure detection method |
| CN112415377B (en) * | 2021-01-21 | 2021-04-20 | 浙江艾罗网络能源技术股份有限公司 | Three-phase grid-connected inverter relay failure detection method |
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