CN102628925A - Method and device for detecting faults of relays of photovoltaic inverter - Google Patents
Method and device for detecting faults of relays of photovoltaic inverter Download PDFInfo
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Abstract
The invention discloses a method and a device for detecting faults of relays of a photovoltaic inverter. When open and close states of relays in a relay group between an inverter output end of the photovoltaic inverter and a power grid are changed continuously, voltage between a live wire and a null wire which are arranged between the relay group and the inverter output end of the photovoltaic inverter and voltage between a live wire and a null wire which are arranged between the relay group and the power grid are sampled respectively, and people can judge whether relays are broken down through comparison of the collected voltage. Wiring voltage detection is performed on the live wire and the null wire which are arranged on the outer side of the relay group to achieve detection of relay faults, detection is convenient, and the method can enable fault judgment to be accurate.
Description
Technical field
The present invention relates to a kind of relay fault detection method and device, particularly photovoltaic DC-to-AC converter relay fault detection method and device.
Background technology
Relay is a very important part in the photovoltaic combining inverter, and it places between inversion output and the electrical network, and purpose is when fault takes place, and effectively breaks off being connected of inverter system and electrical network, improves the security and the reliability of system.Relay has adopted the mode of 2 one group series redundancy, even that is: a relay has been broken, the another one relay also can make inverter effectively cut off electrical network.
Reliability (effectively closed and disconnected) in order to guarantee relay can effectively cut off electrical network to guarantee inverter, and the detection of relay is particularly important.
Summary of the invention
The objective of the invention is to, a kind of photovoltaic DC-to-AC converter relay fault detection method and device are provided.It can adopt the means of external detection to realize the purpose of photovoltaic DC-to-AC converter relay fault detect under broken situation of changing inverter structure, and detects more conveniently, and the result is more accurate.
Technical scheme of the present invention: a kind of photovoltaic DC-to-AC converter relay fault detection method; Be characterized in: when each relay continuously changes open and-shut mode in the relay group between photovoltaic DC-to-AC converter inverting output terminal and electrical network; Voltage between live wire between the relay group of sampling respectively and the photovoltaic DC-to-AC converter inverting output terminal and zero line; And voltage between live wire between relay group and the electrical network and zero line, judged whether that through the voltage that relatively collects relay breaks down.
In the above-mentioned photovoltaic DC-to-AC converter relay fault detection method; When detecting the relay of single-phase photovoltaic DC-to-AC converter; The relay group comprises relay S2 and the S4 that is connected in series on the relay S1 that is connected in series on the live wire and S3, the zero line; Voltage U 2 between live wire between detection relay group and the photovoltaic DC-to-AC converter inverting output terminal and zero line, and voltage U 1 between live wire between relay group and the electrical network and zero line, whether the voltage U 1 under each state of comparator relay group draws with U2 has relay to break down.
In the aforesaid photovoltaic DC-to-AC converter relay fault detection method; Said each state of relay group is divided into a, b, c, d, e, f, g, h and nine continuous variable condition of i; State a is that relay S1, S2, S3 and S4 all break off; State b closes for 3 relays wherein, and state c, d, e, f, g and h are the state that on the basis of preceding state, only changes one of them relay, and state i all closes for all relays.
In the aforesaid photovoltaic DC-to-AC converter relay fault detection method, the voltage U 1 under said each state of comparator relay group draws the method that whether has relay to break down with U2 and is:
Under state b, d, f and h:
is during greater than threshold value; And under state i; Only at
during less than threshold value, the relay group is the non-fault relay; N is the voltage sample quantity in every 20ms.
In the aforesaid photovoltaic DC-to-AC converter relay fault detection method; When detecting the relay of three-phase photovoltaic DC-to-AC converter; The relay group comprises two one group relay S1 and S2, relay S3 and S4 and relay S5 and S6 that is serially connected on each bar live wire respectively; The relay S7 and the S8 that are connected in series on the zero line detect voltage U 4, U5 and U6 between each bar live wire and the zero line between relay group and the photovoltaic DC-to-AC converter inverting output terminal, and voltage U 1, U2 and U3 between each bar live wire between relay group and the electrical network and zero line; Wherein U1 and U4 detect voltage on the same live wire that is separated by relay S1 and S2; U2 and U5 detect voltage on the same live wire that is separated by relay S3 and S4, U4 and U6 detection voltage on the same live wire that is separated by relay S5 and S6, voltage U 1 and the U4 under each state of comparator relay group again; U2 and U5, and whether U4 and U6 draw and have relay to break down.
In the aforesaid photovoltaic DC-to-AC converter relay fault detection method, said each state of relay group is divided into a, b, c, d, e, f, g, h and nine continuous variable condition of i, and the state of S1, S3 and S5 is identical all the time; The state of S2, S4 and S6 is also identical all the time, and 8 relays are divided into relay " S1, S3 and S5 ", " S2, S4 and S6 "; " S7 "; And " S8 " these four groups, state a is four groups and all breaks off that state b is for wherein 3 making up; State c, d, e, f, g and h are and on the basis of preceding state, only change wherein one group state, and state i is four groups and all closes.
In the aforesaid photovoltaic DC-to-AC converter relay fault detection method, voltage U 1 and U4 under said each state of comparator relay group, U2 and U5 reach U4 and U6, draw the method that whether has relay to break down and are:
Under state b, d, f and h:
With
Simultaneously greater than threshold value (being generally 60V), and under state i V
Δ 1(RMS), V
Δ 2And V (RMS),
Δ 3During (RMS) simultaneously less than threshold value, the relay group is the non-fault relay; N is the voltage sample quantity in every 20ms.
Realize a kind of single-phase photovoltaic DC-to-AC converter relay failure detector of preceding method; Be included in first voltage acquisition module of cross-over connection between live wire and the zero line between relay group and the photovoltaic DC-to-AC converter inverting output terminal; And second voltage acquisition module of cross-over connection between live wire between relay group and the electrical network and zero line, first voltage acquisition module and second voltage acquisition module) link to each other with processing unit.
Realize a kind of three-phase photovoltaic DC-to-AC converter relay failure detector of preceding method; Be included in the 3rd, the 4th and the 5th voltage acquisition module of cross-over connection between every live wire and the zero line between relay group and the photovoltaic DC-to-AC converter inverting output terminal; And the 6th, the 7th and the 8th voltage acquisition module of cross-over connection between every live wire between relay group and the electrical network and zero line, all voltage acquisition modules all link to each other with processing unit.
Compared with prior art, the present invention only needs on the outside live wire of relay group and zero line, to carry out wiring detection voltage can realize the detection to the relay fault, detects more conveniently, and can make fault judgement more accurate in method of the present invention.
Description of drawings
Fig. 1 is the relay status synoptic diagram of the single-phase photovoltaic DC-to-AC converter relay of the present invention fault detect;
Fig. 2 is the relay status synoptic diagram of three-phase photovoltaic DC-to-AC converter relay of the present invention fault detect;
Fig. 3 is a single-phase photovoltaic DC-to-AC converter relay failure detector structural representation of the present invention;
Fig. 4 is a three-phase photovoltaic DC-to-AC converter relay failure detector structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described, but not as the foundation to the present invention's restriction.
Embodiment.
A kind of single-phase photovoltaic DC-to-AC converter relay fault detection method: when each relay continuously changes open and-shut mode in the relay group between photovoltaic DC-to-AC converter inverting output terminal and electrical network; Voltage between live wire between the relay group of sampling respectively and the photovoltaic DC-to-AC converter inverting output terminal and zero line; And voltage between live wire between relay group and the electrical network and zero line, judged whether that through the voltage that relatively collects relay breaks down.The relay group comprises that upward relay S1 and S3, the zero line (N) of serial connection are gone up relay S2 and the S4 that is connected in series to live wire (L); Voltage U 2 between live wire between detection relay group and the photovoltaic DC-to-AC converter inverting output terminal and zero line; And voltage U 1 between live wire between relay group and the electrical network and zero line, whether the voltage U 1 under each state of comparator relay group draws with U2 has relay to break down.Said each state of relay group is divided into a, b, c, d, e, f, g, h and nine continuous variable condition of i; State a is that relay S1, S2, S3 and S4 all break off; State b closes for 3 relays wherein, and state c, d, e, f, g and h are the state that on the basis of preceding state, only changes one of them relay, and state i all closes for all relays; As shown in Figure 1, each state is driven by PWM.
Under state b, d, f and h:
is during greater than a threshold value; And under state i; Only at
during less than a threshold value, the relay group is the non-fault relay; N is the voltage sample quantity in every 20ms.
A kind of three-phase photovoltaic DC-to-AC converter relay fault detection method: when each relay continuously changes open and-shut mode in the relay group between photovoltaic DC-to-AC converter inverting output terminal and electrical network; Voltage between live wire between the relay group of sampling respectively and the photovoltaic DC-to-AC converter inverting output terminal and zero line; And voltage between live wire between relay group and the electrical network (L1, L2 and L3) and zero line (N), judged whether that through the voltage that relatively collects relay breaks down.The relay group comprises two one group relay S1 and S2, relay S3 and S4 and relay S5 and S6 that is serially connected on each bar live wire respectively; The relay S7 and the S8 that are connected in series on the zero line; Voltage U 4, U5 and U6 between each bar live wire between detection relay group and the photovoltaic DC-to-AC converter inverting output terminal and zero line; And voltage U 1, U2 and U3 between each bar live wire between relay group and the electrical network and zero line, wherein U1 and U4 detect voltage on the same live wire that is separated by relay S1 and S2, and U2 and U5 detection voltage are on the same live wire that is separated by relay S3 and S4; U4 and U6 detect voltage on the same live wire that is separated by relay S5 and S6; Voltage U 1 and U4 under each state of comparator relay group again, U2 and U5, and whether U4 and U6 draw and have relay to break down.Said each state of relay group is divided into a, b, c, d, e, f, g, h and nine continuous variable condition of i, and the state of S1, S3 and S5 is identical all the time, and the state of S2, S4 and S6 is also identical all the time; 8 relays are divided into relay " S1, S3 and S5 ", " S2, S4 and S6 ", " S7 "; And " S8 " these four groups; State a is four groups and all breaks off that state b is for wherein 3 making up, and state c, d, e, f, g and h are and on the basis of preceding state, only change wherein one group state; State i is four groups and all closes, and is as shown in Figure 2.
Under state b, d, f and h:
With
Simultaneously greater than threshold value, and under state i V
Δ 1(RMS), V
Δ 2And V (RMS),
Δ 3(RMS) during simultaneously little threshold value, the relay group is the non-fault relay; N is the voltage sample quantity in every 20ms.
A kind of single-phase photovoltaic DC-to-AC converter relay failure detector; As shown in Figure 3; Be included in first voltage acquisition module 4 of cross-over connection between live wire and the zero line between relay group 2 and the photovoltaic DC-to-AC converter inverting output terminal 1; And second voltage acquisition module, 5, the first voltage acquisition modules 4 of cross-over connection link to each other with processing unit 6 with second voltage acquisition module 5 between live wire between relay group 2 and the electrical network 3 and zero line.
A kind of three-phase photovoltaic DC-to-AC converter relay failure detector; As shown in Figure 4: the 3rd, the 4th and the 5th voltage acquisition module 7,8 and 9 that is included in cross-over connection between every live wire and the zero line between relay group 2 and the photovoltaic DC-to-AC converter inverting output terminal 1; And the 6th, the 7th and the 8th voltage acquisition module 10,11 and 12 of cross-over connection between every live wire between relay group 2 and the electrical network 3 and zero line, all voltage acquisition modules all link to each other with processing unit 6.
C among the present invention, e, g are transition periods, have or all are not within the scope.Relay (S2, S4, S6), and S8, (S1, S3 S5), change between the number order of S7, also are within the scope.
Claims (9)
1. photovoltaic DC-to-AC converter relay fault detection method; It is characterized in that: when each relay continuously changes open and-shut mode in the relay group between photovoltaic DC-to-AC converter inverting output terminal and electrical network; Voltage between live wire between the relay group of sampling respectively and the photovoltaic DC-to-AC converter inverting output terminal and zero line; And voltage between live wire between relay group and the electrical network and zero line, judged whether that through the voltage that relatively collects relay breaks down.
2. photovoltaic DC-to-AC converter relay fault detection method according to claim 1; It is characterized in that: when detecting the relay of single-phase photovoltaic DC-to-AC converter; The relay group comprises relay S2 and the S4 that is connected in series on the relay S1 that is connected in series on the live wire and S3, the zero line; Voltage U 2 between live wire between detection relay group and the photovoltaic DC-to-AC converter inverting output terminal and zero line; And voltage U 1 between live wire between relay group and the electrical network and zero line, whether the voltage U 1 under each state of comparator relay group draws with U2 has relay to break down.
3. photovoltaic DC-to-AC converter relay fault detection method according to claim 2; It is characterized in that; Said each state of relay group is divided into a, b, c, d, e, f, g, h and nine continuous variable condition of i, and state a is that relay S1, S2, S3 and S4 all break off, and state b closes for 3 relays wherein; State c, d, e, f, g and h are the state that on the basis of preceding state, only changes one of them relay, and state i all closes for all relays.
4. photovoltaic DC-to-AC converter relay fault detection method according to claim 3 is characterized in that, the voltage U 1 under said each state of comparator relay group draws the method that whether has relay to break down with U2 and is:
Under state b, d, f and h:
is during greater than threshold value; And under state i; Only at
during less than threshold value, the relay group is the non-fault relay; N is the voltage sample quantity in every 20ms.
5. photovoltaic DC-to-AC converter relay fault detection method according to claim 1; It is characterized in that: when detecting the relay of three-phase photovoltaic DC-to-AC converter; The relay group comprises two one group relay S1 and S2, relay S3 and S4 and relay S5 and S6 that is serially connected on each bar live wire respectively; The relay S7 and the S8 that are connected in series on the zero line detect voltage U 4, U5 and U6 between each bar live wire and the zero line between relay group and the photovoltaic DC-to-AC converter inverting output terminal, and voltage U 1, U2 and U3 between each bar live wire between relay group and the electrical network and zero line; Wherein U1 and U4 detect voltage on the same live wire that is separated by relay S1 and S2; U2 and U5 detect voltage on the same live wire that is separated by relay S3 and S4, U4 and U6 detection voltage on the same live wire that is separated by relay S5 and S6, voltage U 1 and the U4 under each state of comparator relay group again; U2 and U5, and whether U4 and U6 draw and have relay to break down.
6. photovoltaic DC-to-AC converter relay fault detection method according to claim 5 is characterized in that, said each state of relay group is divided into a, b, c, d, e, f, g, h and nine continuous variable condition of i; The state of S1, S3 and S5 is identical all the time, and the state of S2, S4 and S6 is also identical all the time, and 8 relays are divided into relay " S1, S3 and S5 "; " S2, S4 and S6 ", " S7 ", and " S8 " these four groups; State a is four groups and all breaks off; State b is for wherein 3 making up, and state c, d, e, f, g and h are and on the basis of preceding state, only change wherein one group state, and state i is four groups and all closes.
7. photovoltaic DC-to-AC converter relay fault detection method according to claim 6 is characterized in that, voltage U 1 and U4 under said each state of comparator relay group, and U2 and U5 reach U4 and U6, draw the method that whether has relay to break down and are:
Under state b, d, f and h:
With
Simultaneously greater than threshold value, and under state i V
Δ 1(RMS), V
Δ 2And V (RMS),
Δ 3During (RMS) simultaneously less than threshold value, the relay group is the non-fault relay; N is the voltage sample quantity in every 20ms.
8. single-phase photovoltaic DC-to-AC converter relay failure detector; It is characterized in that: first voltage acquisition module (4) that is included in cross-over connection between live wire and the zero line between relay group (2) and the photovoltaic DC-to-AC converter inverting output terminal (1); And second voltage acquisition module (5) of cross-over connection between live wire between relay group (2) and the electrical network (3) and zero line, first voltage acquisition module (4) links to each other with processing unit (6) with second voltage acquisition module (5).
9. three-phase photovoltaic DC-to-AC converter relay failure detector; It is characterized in that: the 3rd, the 4th and the 5th voltage acquisition module (7,8 and 9) that is included in cross-over connection between every live wire and the zero line between relay group (2) and the photovoltaic DC-to-AC converter inverting output terminal (1); And the 6th, the 7th and the 8th voltage acquisition module (10,11 and 12) of cross-over connection between every live wire between relay group (2) and the electrical network (3) and zero line, all voltage acquisition modules all link to each other with processing unit (6).
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Application publication date: 20120808 |