CN108363000A - A kind of abatement detecting method of inverter repeat circuit - Google Patents
A kind of abatement detecting method of inverter repeat circuit Download PDFInfo
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- CN108363000A CN108363000A CN201810063081.8A CN201810063081A CN108363000A CN 108363000 A CN108363000 A CN 108363000A CN 201810063081 A CN201810063081 A CN 201810063081A CN 108363000 A CN108363000 A CN 108363000A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
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Abstract
The present invention discloses a kind of abatement detecting method of inverter repeat circuit, includes the following steps：A, selected successively in other each relays in addition to the n-th relay farthest away from grid side or load-side one as measured relay, the relay between measured relay and grid side or load-side is set to be closed, the relay between measured relay and inverter side disconnects；B, judge whether measured relay fails positioned at its electric current away from the current sampling unit detection of side farther out of grid side or load-side when disconnecting, being closed by measured relay；C0：Inverter control circuit generates a detection voltage；C, it disconnects other each relays, judges whether n-th relay fails positioned at its electric current away from the detection of the current sampling unit of grid side or the nearlyr side of load-side when disconnecting, being closed by n-th relay；Execute step A and B N 1 time.This method can avoid the case where erroneous judgement, and there is no inspection side blind spots.
Description
Technical field
The present invention relates to inverter detection fields, and in particular to a kind of abatement detecting method of inverter repeat circuit.
Background technology
Due to the requirement of secure context inside conventional inverter, close to grid side or load-side, need there are two or
More than two relay series connection, realize redundancy protecting, as shown in Figure 1.It is first before two or more relays are all closed
It first needs to judge each relay function whether all well can realize the action of open and close.Judge through relay function
After relay timeliness situation without exception, grid-connected or output power could be continued.
Whether good, the detection circuit currently existed for the function of detecting relay, but all there is detection blind spot
Or the case where erroneous judgement.Such as the wiring of mistake, and relay is normally also to report relay exception by mistake.Or due to control
Circuit, other elements are abnormal, and relay is normally also to report relay exception etc. by mistake.
Invention content
In view of the above technical problems, the object of the present invention is to provide a kind of abatement detecting methods of inverter repeat circuit.
In order to achieve the above objectives, the technical solution adopted by the present invention is：
A kind of abatement detecting method of inverter repeat circuit, inverter include from grid side or load-side to inverter side successively
Concatenated N number of inverter, N >=2 are respectively provided with current sampling unit and impedor between two relays of arbitrary neighborhood,
It is characterized in that, includes the following steps：
A, selected in other each relays in addition to the n-th relay farthest away from grid side or load-side one as tested
Relay makes the relay between measured relay and grid side or load-side be closed, and is located at measured relay and inversion
Relay between side disconnects；
B, by measured relay when disconnecting, being closed positioned at its current sampling unit away from grid side or load-side side farther out
The electric current of detection judges whether measured relay fails；
The step A and B N-1 times is executed, is judged successively other in addition to the n-th relay farthest away from grid side or load-side
Whether each relay fails；
The abatement detecting method further includes step C0 and step C；
The step C0：Inverter control circuit generates a detection voltage；
The step C：So that other each relays is disconnected, it is located at away from power grid when disconnecting, being closed by n-th relay
The electric current of the current sampling unit of side or the nearlyr side of load-side detection judges whether n-th relay fails.
In some embodiments, step B is specifically included：
B1, measured relay is made to disconnect, by positioned at current sample of the measured relay away from grid side or load-side side farther out
Unit detects electric current；If electric current is not detected, it is normal to judge that measured relay disconnects；If detecting electric current, judge tested
Relay disconnects abnormal；
B2, measured relay is made to be closed, by positioned at current sample of the measured relay away from grid side or load-side side farther out
Unit detects electric current；If detecting electric current, it is normal to judge that measured relay is closed；If electric current is not detected, judge tested
Relay is closed abnormal.
In some embodiments, step C is specifically included：
C1, n-th relay disconnect, by positioned at current sample of the n-th relay away from grid side or the nearlyr side of load-side
Unit detects electric current；If electric current is not detected, it is normal to judge that n-th relay disconnects；If detecting electric current, N is judged
A relay disconnects abnormal；
C2, n-th relay is made to be closed, by being adopted positioned at electric current of the n-th relay away from grid side or the nearlyr side of load-side
Sample unit detects electric current；If detecting electric current, it is normal to judge that n-th relay is closed；If electric current is not detected, is judged
N number of relay is closed abnormal.
In some embodiments, the abatement detecting method further includes the following steps before being located at step A：By being set to
The voltage sampling unit of the side closer away from grid side or load-side of 1st relay detects whether that there are AC voltages；If depositing
In AC voltages, A is thened follow the steps.
In some embodiments, the step C0 further includes：Detect the n-th relay away from the nearlyr side of inverter side
Voltage judge that the control circuit is abnormal if voltage is not detected；If detecting voltage, the step is executed
C。
In some embodiments, the current sampling unit is connected between two neighboring relay and an and impedance element
After part concatenation again with another impedor and connect.
In some embodiments, the current sampling unit is hall device or current transformer.
In some embodiments, the impedor is capacitance or resistance.
In some embodiments, N=2, the 1st relay and the 2nd relay from the grid side of inverter or load-side according to
Secondary concatenation, the abatement detecting method in turn include the following steps：
S1, it is detected whether by the voltage sampling unit set on the side closer away from grid side or load-side of the 1st relay
There are AC voltages；If there are AC voltages, following step is executed；
S2, so that the 1st relay and the 2nd relay is disconnected, pass through the current sampling unit between two relays
Detect electric current；If electric current is not detected, it is normal to judge that the 1st relay disconnects；If detecting electric current, judge the 1st after
Electric appliance disconnects abnormal；
S3, the 1st relay closure, the 2nd relay is made to remain open, if the current sampling unit detects electric current,
It is normal to judge that the 1st relay is closed；If electric current is not detected in the current sampling unit, judge that the 1st relay is closed
It is abnormal；
S4, the 1st relay and the 2nd relay is made to disconnect, the control circuit of inverter side generates the detection voltage；
The voltage away from the nearlyr side of inverter side of S5, the detection n-th relay, if voltage is not detected, described in judgement
Inverter control circuit is abnormal；If detecting voltage, following step is executed；
If electric current is not detected in S6, the current sampling unit, it is normal to judge that the 2nd relay disconnects；If the electric current is adopted
Sample unit detects electric current, and it is abnormal to judge that the 2nd relay disconnects；
S7, the 2nd relay closure, the 1st relay is made to remain open, if the current sampling unit detects electric current,
It is normal to judge that the 2nd relay is closed；If electric current is not detected in the current sampling unit, judge that the 2nd relay is closed
It is abnormal.
The present invention uses above scheme, has the following advantages that compared with prior art：
Electric current when more each relay is disconnected, is closed judges whether each relay disconnects abnormal, closure exception respectively, can
The case where avoiding erroneous judgement, there is no inspection side blind spots.
Description of the drawings
It, below will be to attached drawing needed in embodiment description in order to illustrate more clearly of technical scheme of the present invention
It is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, general for this field
For logical technical staff, without creative efforts, other drawings may also be obtained based on these drawings.
Fig. 1 is the circuit diagram according to a kind of inverter of the present invention.
Specific implementation mode
The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that advantages and features of the invention energy
It is easier to be understood by the person skilled in the art.It should be noted that the explanation for these embodiments is used to help
Understand the present invention, but does not constitute limitation of the invention.In addition, involved in the various embodiments of the present invention described below
And to technical characteristic can be combined with each other as long as they do not conflict with each other.
The present embodiment provides a kind of abatement detecting methods of inverter repeat circuit.The circuit diagram of inverter as shown in Figure 1,
It includes inverter module, inductance, control circuit（It is not shown in figure）And multiple relays, multiple relays are from grid side or bear
Side to inverter side is carried to be sequentially connected in series.Specifically carry out the inspection of the failure to inverter repeat circuit in the present embodiment by taking two relays as an example
Survey method is described in detail, wherein the relay of the close grid side on right side is denoted as the 1st relay A, left side it is close
The relay of inverter side is denoted as the 2nd relay B.
As shown in Figure 1, voltage sampling unit 1 is equipped on the right side of the 1st relay A, for detecting whether there are AC voltages；
Voltage sampling unit 2 is equipped on the left of the 2nd relay B, for detecting relay test with the presence or absence of detection voltage.At two
Current sampling unit CT and impedor X1, X2 are equipped between relay A and B, for detecting electric current.Wherein, voltage sample list
Member 1,2 can be voltage sampling circuit or voltage sensor.Current sampling unit CT is that existing electric current is detectd in inverter circuit
Survey device, such as hall device, or current transformer.Current sampling unit CT is connected between two relays A and B,
And with after an impedor X2 concatenation again with another impedor X1 and connect, impedor X1, X2 are capacitance or resistance etc.
Passive or active device.
One, in an initial condition, two relays are all the case where disconnection.When detecting the 1st relay A, pass through
Compare the case where the 1st relay A of control is disconnected, is closed, it can be determined that whether the 1st relay A fails.
Before judgement, judge that AC voltages whether there is by voltage sampling unit 1 first.If in the presence of following steps are executed
Suddenly：
1）It controls in the case that the 1st relay A and the 2nd relay B disconnect, if current sampling unit CT is not detected
To electric current, then it may determine that the 1st relay A is normally open.If current sampling unit CT detects electric current, can sentence
Disconnected 1st relay A is closed state, and the 1st relay disconnects abnormal at this time.
2）It controls in the case that the 1st relay A is closed, the 2nd relay B is remained open, if current sampling unit
CT detects electric current, it can be determined that the 1st relay A is closed state, at this time the 1st relay A normally closed.If electric current
Sampling unit CT does not detect electric current, then may determine that the 1st relay A is to disconnect exception.
Two, in an initial condition, two relays A and B are the case where disconnection.Before detecting the 2nd relay B,
It needs control circuit to generate an alternating voltage, judges whether system has generation exchange detection voltage by voltage sampling unit 2.
When detecting the 2nd relay B, the case where disconnecting, be closed by comparing the 2nd relay B of control, it can sentence
Whether the 2nd relay B that break fails.
1）If voltage is not detected in voltage sampling unit 2, it can be determined that circuit, power cell exception or adopt in order to control
Sample circuit abnormal.
2）It controls in the case that the 1st relay A and the 2nd relay B disconnect, if current sampling unit CT does not have
Detect electric current, it can be determined that the 2nd relay B disconnects normal.If current sampling unit CT detects electric current, can be sentenced
2 disconnected relays are closed state, and the 2nd relay B is disconnected abnormal at this time.
3）It controls in the case that the 2nd relay B is closed, the 1st relay A is remained open, if current sampling unit
CT detects electric current, it can be determined that the 2nd relay B is closed state, and the 2nd relay B is closed normal at this time, if electric current
Sampling unit CT does not detect electric current, it can be determined that for the 2nd relay B be disconnection, this time the 2nd relay B close
It closes abnormal.
For including the inverter of N number of relay and N >=3, direction of N number of relay edge from grid side to load-side is successively
Series connection, it is respectively provided with current sampling unit and impedor between two relays of arbitrary neighborhood.The failure detection side of relay
In method, detection the 1st to the step of N-1 relay with above-mentioned step 1, only before detecting n-th relay, inversion
The control circuit of device generates an exchange detection voltage.Detailed process is as follows：
A, selected in other each relays in addition to the n-th relay farthest away from grid side or load-side one as tested
Relay makes the relay between measured relay and inverter side be closed, and is located at measured relay and grid side or load
Relay between side disconnects；
B, by measured relay when disconnecting, being closed positioned at its current sampling unit away from grid side or load-side side farther out
The electric current of detection judges whether measured relay fails；
N-1 step A, B is executed, judges that other each relays are in addition to the n-th relay close to inverter load-side successively
No failure；
C0：Inverter control circuit generates an exchange detection voltage, detection n-th relay away from the nearlyr side of inverter side
Voltage judges that the inverter control circuit is abnormal if voltage is not detected；If detecting voltage, execute following
Step；
C, it disconnects other each relays, it is located at away from grid side or load when disconnecting, being closed by n-th relay
The electric current of the current sampling unit detection of side nearlyr side judges whether n-th relay fails.
Step B detailed processes are with reference to above-mentioned steps one, and step C detailed processes are with reference to above-mentioned steps two.
Such as the situation of three relays, under original state, three relays are all to disconnect；
Judge that grid side AC voltages whether there is, under conditions of AC voltages have, first passes through disconnection, is closed near grid side or bears
Whether carry the 1st relay of side abnormal to detect the 1st relay；
After the completion of 1st relay test, the 1st relay is closed, for the detection process of the 2nd and the 3rd relay
Then similar to the above-mentioned detection to relay A and B, correspond to the detection process of two relays, i.e.,：
3rd relay remains open, and is to detect the 2nd relay positioned at the 2nd intermediate relay by disconnecting, being closed
No exception；
After the completion of 2nd relay test, three relays are disconnected, inverter side generates detection voltage, by disconnecting, being closed
Whether the 3rd relay be abnormal to detect the 3rd relay.
The above embodiments merely illustrate the technical concept and features of the present invention, is a kind of preferred embodiment, and purpose exists
It cans understand the content of the present invention and implement it accordingly in person skilled in the art, the protection of the present invention can not be limited with this
Range.Equivalent transformation or modification made by all Spirit Essences according to the present invention, should all cover protection scope of the present invention it
It is interior.
Claims (9)
1. a kind of abatement detecting method of inverter repeat circuit, which is characterized in that inverter includes from grid side or load
N number of inverter that side to inverter side is sequentially connected in series, N >=2 are respectively provided with current sampling unit between two relays of arbitrary neighborhood
And impedor, the abatement detecting method include the following steps：
A, selected in other each relays in addition to the n-th relay farthest away from grid side or load-side one as tested
Relay makes the relay between measured relay and grid side or load-side be closed, and is located at measured relay and inversion
Relay between side disconnects；
B, by measured relay when disconnecting, being closed positioned at its current sampling unit away from grid side or load-side side farther out
The electric current of detection judges whether measured relay fails；
The step A and B N-1 times is executed, is judged successively other in addition to the n-th relay farthest away from grid side or load-side
Whether each relay fails；
The abatement detecting method further includes step C0 and step C；
The step C0：Inverter control circuit generates a detection voltage；
The step C：So that other each relays is disconnected, it is located at away from power grid when disconnecting, being closed by n-th relay
The electric current of the current sampling unit of side or the nearlyr side of load-side detection judges whether n-th relay fails.
2. abatement detecting method according to claim 1, which is characterized in that step B is specifically included：
B1, measured relay is made to disconnect, by positioned at current sample of the measured relay away from grid side or load-side side farther out
Unit detects electric current；If electric current is not detected, it is normal to judge that measured relay disconnects；If detecting electric current, judge tested
Relay disconnects abnormal；
B2, measured relay is made to be closed, by positioned at current sample of the measured relay away from grid side or load-side side farther out
Unit detects electric current；If detecting electric current, it is normal to judge that measured relay is closed；If electric current is not detected, judge tested
Relay is closed abnormal.
3. abatement detecting method according to claim 1, which is characterized in that step C is specifically included：
C1, n-th relay disconnect, by positioned at current sample of the n-th relay away from grid side or the nearlyr side of load-side
Unit detects electric current；If electric current is not detected, it is normal to judge that n-th relay disconnects；If detecting electric current, N is judged
A relay disconnects abnormal；
C2, n-th relay is made to be closed, by being adopted positioned at electric current of the n-th relay away from grid side or the nearlyr side of load-side
Sample unit detects electric current；If detecting electric current, it is normal to judge that n-th relay is closed；If electric current is not detected, is judged
N number of relay is closed abnormal.
4. abatement detecting method according to claim 1, which is characterized in that the abatement detecting method further includes being located at step
Following steps before rapid A：Pass through the voltage sample list set on the side closer away from grid side or load-side of the 1st relay
Member detects whether that there are AC voltages；If there are AC voltages, A is thened follow the steps.
5. abatement detecting method according to claim 1, which is characterized in that the step C0 further includes：Detect the N
The voltage away from the nearlyr side of inverter side of a relay judges that the control circuit is abnormal if voltage is not detected；If
It detects voltage, then executes the step C.
6. abatement detecting method according to claim 1, which is characterized in that the current sampling unit is connected on adjacent two
Between a relay and and impedor concatenate after again with another impedor and connect.
7. abatement detecting method according to claim 6, which is characterized in that the current sampling unit be hall device or
Current transformer.
8. abatement detecting method according to claim 6, which is characterized in that the impedor is capacitance or resistance.
9. according to claim 1-8 any one of them abatement detecting methods, which is characterized in that N=2, the 1st relay and the 2nd
A relay is sequentially connected in series from the grid side or load-side of inverter, and the abatement detecting method in turn includes the following steps：
S1, it is detected whether by the voltage sampling unit set on the side closer away from grid side or load-side of the 1st relay
There are AC voltages；If there are AC voltages, following step is executed；
S2, so that the 1st relay and the 2nd relay is disconnected, pass through the current sampling unit between two relays
Detect electric current；If electric current is not detected, it is normal to judge that the 1st relay disconnects；If detecting electric current, judge the 1st after
Electric appliance disconnects abnormal；
S3, the 1st relay closure, the 2nd relay is made to remain open, if the current sampling unit detects electric current,
It is normal to judge that the 1st relay is closed；If electric current is not detected in the current sampling unit, judge that the 1st relay is closed
It is abnormal；
S4, the 1st relay and the 2nd relay is made to disconnect, the control circuit of inverter side generates the detection voltage；
The voltage away from the nearlyr side of inverter side of S5, the detection n-th relay, if voltage is not detected, described in judgement
Inverter control circuit is abnormal；If detecting voltage, following step is executed；
If electric current is not detected in S6, the current sampling unit, it is normal to judge that the 2nd relay disconnects；If the electric current is adopted
Sample unit detects electric current, and it is abnormal to judge that the 2nd relay disconnects；
S7, the 2nd relay closure, the 1st relay is made to remain open, if the current sampling unit detects electric current,
It is normal to judge that the 2nd relay is closed；If electric current is not detected in the current sampling unit, judge that the 2nd relay is closed
It is abnormal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810063081.8A CN108363000B (en) | 2018-01-23 | 2018-01-23 | Failure detection method for relay of inverter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810063081.8A CN108363000B (en) | 2018-01-23 | 2018-01-23 | Failure detection method for relay of inverter |
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| CN108363000B CN108363000B (en) | 2021-03-19 |
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Cited By (1)
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| CN112964981A (en) * | 2021-02-05 | 2021-06-15 | 苏州海鹏科技有限公司 | Three-phase photovoltaic inverter relay fault detection method |
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| Publication number | Publication date |
|---|---|
| CN108363000B (en) | 2021-03-19 |
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