CN108761319A - Relay failure detection method, device and the system of photovoltaic combining inverter - Google Patents
Relay failure detection method, device and the system of photovoltaic combining inverter Download PDFInfo
- Publication number
- CN108761319A CN108761319A CN201810305928.9A CN201810305928A CN108761319A CN 108761319 A CN108761319 A CN 108761319A CN 201810305928 A CN201810305928 A CN 201810305928A CN 108761319 A CN108761319 A CN 108761319A
- Authority
- CN
- China
- Prior art keywords
- relay
- value
- viscous
- capacitance
- failure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Inverter Devices (AREA)
- Photovoltaic Devices (AREA)
Abstract
An embodiment of the present invention provides a kind of relay failure detection method of photovoltaic combining inverter, apparatus and system, this method controls the first relay closure first, and the second relay of control disconnects.Then the voltage value of the first capacitance of preset period of time is obtained, and according to the direct current score value of voltage value and the exchange score value of voltage value, determines first object value.It when first object value fault threshold viscous less than or equal to default relay, determines that viscous failure does not occur for the first relay, when first object value, which is more than default relay, glues viscous fault threshold, determines the viscous failure of the first relay generation.As it can be seen that then this programme is compared by the voltage value of the first capacitance of detection with predetermined threshold value, and then determine whether relay breaks down.A voltage need to be only acquired, the cost of detection hardware and the resource of digital processing chip can be saved, and since predetermined threshold value feature is apparent, judging result is reliable, to improve the accuracy of detection.
Description
Technical field
The present invention relates to technical field of new energy power generation, and in particular to a kind of relay failure inspection of photovoltaic combining inverter
Survey method, apparatus and system.
Background technology
Photovoltaic combining inverter is a kind of device for converting electric energy being connected among PV photovoltaic panels and power grid, and effect is
The converting direct-current power into alternating-current power that PV photovoltaic panels are generated.Due to safety concerns, it is desirable that inverter is detecting some exceptions
Timely inverter can be cut off from power grid when situation.
The photovoltaic combining inverter (such as string type and distributed photovoltaic gird-connected inverter) of mainstream at present, in inverter side and electricity
Net side is required for being isolated by relay, will disconnect when inverter detects abnormal conditions, timely by inverter from
It is cut off in power grid.
Specifically, as shown in Figure 1, need double relay to be isolated between inverter and power grid, such as S1 and S2, to reach
The purpose of Safety Redundancy, while requiring accurately detect the fault condition of relay before grid-connected inverters, it is general to wrap
Include two kinds of situations：(i.e. relay cannot for the viscous failure (i.e. relay cannot be disconnected normally) of relay and relay normal off failure
It is normal to be attracted).
Currently, more commonly used detection method is to acquire the inverter voltage Vinv and power grid electricity that inverter is surveyed by inverter
Vac is pressed, then detects relay fault condition by comparing the correlation values of inverter voltage Vinv and network voltage Vac, is had
Body process is as follows：
(1) the viscous fault detect of relay：First, it inhales and relay S1, disconnection relay S2, inverter acquires inversion electricity
Press Vinv and network voltage Vac；Secondly, by the digital processing chip (such as DSP) in inverter in real time relatively Vinv and Vac
Numerical value situation (virtual value of such as Vinv-Vac, is denoted as RMS here | Vinv-Vac |), if RMS | Vinv-Vac |<ΔV1(Δ
V1 is the viscous fault threshold of given judgement relay), then it is assumed that S2 inhale and, i.e. viscous failure has occurred in S2；If RMS |
Vinv-Vac|>Δ V1, then it is assumed that S2 is normal；Finally, it similarly inhales and S2, disconnection S1 can detect whether S1 has occurred viscous event
Barrier.
(2) relay normal off fault detect：First, it while inhaling and relay S1 and S2, inverter acquisition inverter voltage
Vinv and network voltage Vac；Secondly, compare the number of Vinv and Vac in real time by the digital processing chip (such as DSP) in inverter
It is worth situation, if RMS | Vinv-Vac |<Δ V2 (Δ V2 be given judgement relay normal off fault threshold), then it is assumed that S1 and
S2 normally inhale and, if RMS | Vinv-Vac |>Δ V2, then it is assumed that normal off failure has occurred in S1 or S2.
However, it is found by the inventors that for three-phase inverter system, above-mentioned inverter voltage Vinv and network voltage Vac need
The inverter voltage and network voltage of three-phase are acquired, for example when two relay fault conditions of detection A phases, needs to acquire A simultaneously
The network voltage Vac_A of phase inverter voltage Vinv_A and A phase, then repeats above-mentioned decision logic.Similarly judge B phases and C phases
When relay failure, the network voltage for acquiring B phases and C phase inverter voltage Vinv_B, Vinv_C and B phase and C phases respectively is needed
Vac_B, Vac_C are required to need in inverter in this way there are three inverter voltage sample circuit and three line voltage sample circuits,
Digital processing chip (such as DSP) in inverter is also required to the sample port of corresponding number, cause hardware cost increase and
The waste of digital processing chip resource, while above-mentioned inverter voltage Vinv samplings are usually that opposite neutral point of electric network is sampled,
When relay disconnects, Vinv acquisitions are floating pressures, and it is not to define very well to lead to relay breakdown judge threshold value Δ V1 and Δ V2,
It is easy erroneous judgement relay failure.
Therefore, how a kind of relay failure detection method, device and the system of photovoltaic combining inverter are provided, it can
The accuracy of detection can be improved again by reducing the cost of detection hardware, be that those skilled in the art's big technology urgently to be resolved hurrily is difficult
Topic.
Invention content
In view of this, an embodiment of the present invention provides a kind of relay failure detection method of photovoltaic combining inverter, dresses
It sets and system, the cost accuracy that raising detects again of detection hardware can be reduced.
To achieve the above object, the embodiment of the present invention provides the following technical solutions：
A kind of relay failure detection method of photovoltaic combining inverter is applied to photovoltaic synchronization inverter system, described
Photovoltaic synchronization inverter system includes bus capacitor, the first capacitance, inversion unit, the first relay, the second relay and filter
There is mid-point, the photovoltaic synchronization inverter system to have relay described in neutral point of electric network for wave module, the bus capacitor
Device abatement detecting method includes：
It controls first relay to be closed, controls second relay and disconnect；
The voltage value of first capacitance of preset period of time is obtained, the preset period of time includes at least one electricity
The net week phase；
According to the direct current score value of the voltage value and the exchange score value of the voltage value, first object value is determined；
When the first object value, which is less than or equal to default relay, glues viscous fault threshold, first relay is determined not
Viscous viscous failure occurs, when the first object value is more than the viscous fault threshold of the default relay, determine described first after
Viscous failure occurs for electric appliance.
Optionally, further include：
It controls second relay to be closed, controls first relay and disconnect；
The voltage value of first capacitance of preset period of time is obtained, the preset period of time includes at least one electricity
The net week phase；
According to the direct current score value of the voltage value and the exchange score value of the voltage value, the first object value is determined；
When the first object value, which is less than or equal to default relay, glues viscous fault threshold, second relay is determined not
Viscous viscous failure occurs, when the first object value is more than the viscous fault threshold of the default relay, determine described second after
Viscous failure occurs for electric appliance.
Optionally, described according to the direct current score value of the voltage value and the exchange score value of the voltage value, determine first
Desired value, including：
Determine that the average value of the voltage value of first capacitance is the direct current score value；
Determine that the direct current score value and the period root-mean-square value of the difference for exchanging score value of first capacitance are described the
One desired value.
Optionally, the viscous fault threshold of the default relay and the default relay normal off fault threshold are all higher than
0 is less than or equal to the period root-mean-square value of network voltage on the first capacitance.
A kind of relay failure detection method of photovoltaic combining inverter is applied to photovoltaic synchronization inverter system, described
Photovoltaic synchronization inverter system includes bus capacitor, the first capacitance, inversion unit, the first relay, the second relay and filter
There is mid-point, the photovoltaic synchronization inverter system to have neutral point of electric network, the relay for wave module, the bus capacitor
Device abatement detecting method includes：
It controls first relay and second relay is closed；
The voltage value of first capacitance of preset period of time is obtained, the preset period of time includes at least one electricity
The net week phase；
According to the direct current score value of the voltage value and the exchange score value of the voltage value, the second desired value is determined；
When second desired value is less than or equal to default relay normal off fault threshold, determine first relay or
Normal off failure occurs for second relay, when second desired value is more than the default relay normal off fault threshold,
Determine that normal off failure does not occur for first relay and second relay.
A kind of relay failure detection device of photovoltaic combining inverter is applied to photovoltaic synchronization inverter system, described
Photovoltaic synchronization inverter system includes bus capacitor, the first capacitance, inversion unit, the first relay, the second relay and filter
There is mid-point, the photovoltaic synchronization inverter system to have neutral point of electric network, the relay for wave module, the bus capacitor
Device failure detection device includes：
First control module is closed for controlling first relay, is controlled second relay and is disconnected；
First acquisition module, the voltage value of first capacitance for obtaining preset period of time, the preset time
Period includes at least one grid cycle；
First determining module is used for according to the direct current score value of the voltage value and the exchange score value of the voltage value, really
Determine first object value；
Second determining module is used for when first object value fault threshold viscous less than or equal to default relay, really
Viscous failure does not occur for fixed first relay, when the first object value is more than the viscous fault threshold of the default relay
When, determine that viscous failure occurs for first relay.
Optionally, the third determining module includes：
First determination unit, for determining that the average value of the voltage value of first capacitance is the direct current score value；
Second determination unit, the period for determining the direct current score value and the difference for exchanging score value of first capacitance
Root-mean-square value is the first object value.
Optionally, the viscous fault threshold of the default relay and the default relay normal off fault threshold are all higher than
0 is less than or equal to the period root-mean-square value of network voltage on the first capacitance.
A kind of relay failure detection device of photovoltaic combining inverter, including：
Second control module is closed for controlling first relay and second relay；
Second acquisition module, the voltage value of first capacitance for obtaining preset period of time, the preset time
Period includes at least one grid cycle；
Third determining module is used for according to the direct current score value of the voltage value and the exchange score value of the voltage value, really
Fixed second desired value；
4th determining module is used for when second desired value is less than or equal to default relay normal off fault threshold, really
Normal off failure occurs for fixed first relay or second relay, when second desired value is more than the default relay
When device normal off fault threshold, determine that normal off failure does not occur for first relay and second relay.
A kind of relay failure detecting system of photovoltaic combining inverter, including any one it is above-mentioned relay failure inspection
Survey device.
Based on the above-mentioned technical proposal, an embodiment of the present invention provides a kind of detections of the relay failure of photovoltaic combining inverter
Method controls first relay and is closed first, controls second relay and disconnects.Then preset period of time is obtained
The voltage value of first capacitance, and according to the direct current score value of the voltage value and the exchange score value of the voltage value, determine
First object value.When the first object value, which is less than or equal to default relay, glues viscous fault threshold, first relay is determined
Viscous viscous failure does not occur for device, when the first object value is more than the viscous fault threshold of the default relay, determines described the
Viscous failure occurs for one relay.As it can be seen that then this programme is compared by the voltage value of the first capacitance of detection with predetermined threshold value
Compared with, and then determine whether relay breaks down.A voltage need to be only acquired, the cost and number of detection hardware can be saved
The resource of word processing chip, but since predetermined threshold value feature is apparent, judging result is reliable, to improve the accurate of detection
Property.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of structural schematic diagram of photovoltaic combining inverter in the prior art；
Fig. 2 is a kind of structural schematic diagram of photovoltaic combining inverter provided in an embodiment of the present invention；
Fig. 3 is that a kind of flow of the relay failure detection method of photovoltaic combining inverter provided in an embodiment of the present invention is shown
It is intended to；
Fig. 4 is using a kind of tool of the relay failure detection method of photovoltaic combining inverter provided in an embodiment of the present invention
The flow diagram of body example；
Fig. 5 is a kind of another stream of the relay failure detection method of photovoltaic combining inverter provided in an embodiment of the present invention
Journey schematic diagram；
Fig. 6 is using a kind of tool of the relay failure detection method of photovoltaic combining inverter provided in an embodiment of the present invention
The another flow diagram of body example；
Fig. 7 is that a kind of structure of the relay failure detection device of photovoltaic combining inverter provided in an embodiment of the present invention is shown
It is intended to.
Specific implementation mode
Referring to Fig. 2, Fig. 2 is a kind of relay failure detection side of photovoltaic combining inverter provided in an embodiment of the present invention
The structural schematic diagram for the photovoltaic synchronization inverter system that method is applied, wherein the photovoltaic synchronization inverter system includes busbar electricity
Hold (C1 and C2), the first capacitance CY, inversion unit 201, the first relay S1, the second relay S2 and filter module.
Wherein, filter module can be LCL filter, including inductance L1, inductance L2 and capacitance Cf compositions.The busbar
There is capacitance mid-point O, the photovoltaic synchronization inverter system to have neutral point of electric network N.
The first capacitance CY can be arranged between the output negative pole PV- and ground of the photovoltaic combining inverter, may be used also
Be arranged on other suitable positions on, as PV+ and between, which can select according to actual design requirement
It is fixed.
Inverter structure based on Fig. 2, relay failure detection method provided in an embodiment of the present invention, as shown in figure 3, packet
Include step：
S31, control first relay are closed, and are controlled second relay and are disconnected；
S32, obtain preset period of time first capacitance voltage value, the preset period of time include at least one
A grid cycle；
S33, according to the direct current score value of the voltage value and the exchange score value of the voltage value, determine first object value；
S34, when the first object value is less than or equal to the viscous fault threshold of default relay, determine first relay
Viscous viscous failure does not occur for device, when the first object value is more than the viscous fault threshold of the default relay, determines described the
Viscous failure occurs for one relay.
Inventor is grid-connected inverse it is considered that generally for interference and personal injury that filtering common mode signal may be brought
Become device generally all can relatively be added Y capacitance to filter out harmful common-mode signal in key position.Therefore, the present embodiment is by adopting
Collect the AC signal in Y capacitance and coordinates the action of relay self-test switch to detect relay failure.
It should be noted that in the present embodiment, the first relay and the second relay can be identical relay,
In order to distinguish the installation site of relay, therefore distinguished by the one the second.In the present embodiment, some relay is controlled
It is closed, after other relays disconnect, by obtaining parameter preset, and then determines whether the relay of the closure breaks down.
Based on this principle, relay failure detection method provided in this embodiment can also include step：
It controls second relay to be closed, controls first relay and disconnect；
The voltage value of first capacitance of preset period of time is obtained, the preset period of time includes at least one electricity
The net week phase；
According to the direct current score value of the voltage value and the exchange score value of the voltage value, the first object value is determined；
When the first object value, which is less than or equal to default relay, glues viscous fault threshold, second relay is determined not
Viscous viscous failure occurs, when the first object value is more than the viscous fault threshold of the default relay, determine described second after
Viscous failure occurs for electric appliance.
Schematically, in conjunction with Fig. 4, relay failure detection method provided in this embodiment is as follows：
(1) it by taking two relays of A phases as an example, first inhales and A phase S1 relays, disconnection S2 relays；
(2) wait for relay complete response action command after, digital processing chip (such as DSP) with fixed time period (such as
The DSP interrupt time) voltage of CY capacitances is sampled, needing to acquire the value of N number of grid cycle altogether, (N is more than or equal to 1
Integer), the sampled value of wherein ith is denoted as Vcy (i), and total sampling number is denoted as n in N number of grid cycle time；
(3) flip-flop in Vcy (i) is calculated, that is, calculates the average value of the voltage of the CY capacitances of acquisition；
(4) the period root-mean-square value of alternating component in Vcy (i) is calculated, that is, the period for calculating Vcy (i)-Vcy_ave is square
Root is denoted as RMS (Vcy (i)-Vcy_ave)；
(5) judge whether relay has occurred viscous failure according to the size of RMS (Vcy (i)-Vcy_ave) value.Because
If relay S2 does not occur to glue, the voltage on CY capacitances will be that PV bears voltage-to-ground, be a DC quantity, RMS
(Vcy (i)-Vcy_ave) by be one close to 0 number；It is glued if relay S2 has occurred, A phases power grid will pass through
S1/S2-->Cf-->C2-->The circuits CY access the earth, wherein CY are Y capacitance, and capacitance, which will be much smaller than, is equal to CF, C2, so CY
Impedance on this circuit is significantly larger than the impedance of CF, C2, and according to impedance voltage divider principle, the voltage of A phase power grids is by most of point
It is pressed on CY capacitances, negative power grid of acs of the DC quantity+partial pressure on CY capacitances over the ground of voltage=PV on CY capacitances, RMS
The period root-mean-square value of (Vcy (i)-Vcy_ave)=partial pressure network voltage on CY capacitances.One can be set according to the above analysis
The viscous fault threshold △ V1 of a judgement relay, if RMS (Vcy (i)-Vcy_ave)<It is viscous then to can determine that S2 does not occur by △ V1
Viscous failure；If RMS (Vcy (i)-Vcy_ave)>△ V1 then can determine that viscous failure has occurred in S2；
(6) repeat the above steps (1)~(5), it can be determined that whether relay S1 has occurred viscous failure.
As it can be seen that this programme by detect the first capacitance voltage value, be then compared with predetermined threshold value, so determine after
Whether electric appliance breaks down.A voltage need to be only acquired, the cost and digital processing chip for detecting hardware can be saved
Resource, but since predetermined threshold value feature is apparent, judging result is reliable, to improve the accuracy of detection.
On the basis of the above embodiments, relay failure detection method provided in this embodiment, it may be determined that relay
Whether normal off failure is occurred, as shown in figure 5, including：
S51, control first relay and second relay are closed；
S52, obtain preset period of time first capacitance voltage value, the preset period of time include at least one
A grid cycle；
S53, according to the direct current score value of the voltage value and the exchange score value of the voltage value, determine the second desired value；
S54, when second desired value is less than or equal to default relay normal off fault threshold, determine first relay
Normal off failure occurs for device or second relay, when second desired value is more than the default relay normal off fault threshold
When, determine that normal off failure does not occur for first relay and second relay.
Wherein, in the present embodiment, the exchange of the direct current score value and the voltage value according to the voltage value point
Value, determines first object value, can be specially：Determine that the average value of the voltage value of first capacitance is the direct current score value,
Then the determining direct current score value is first mesh with the period root-mean-square value of the difference for exchanging score value of first capacitance
Scale value.
Also, the viscous fault threshold of the default relay and the default relay normal off fault threshold are all higher than 0
Less than or equal to the period root-mean-square value of network voltage on the first capacitance.
Schematically, in conjunction with Fig. 6, another relay failure detection method provided in this embodiment is as follows：
(1) it by taking A phase relays as an example, issues S1 and S2 and is attracted instruction；
(2) step (2)~(4) in the viscous fault detection method of above-mentioned relay are repeated, RMS (Vcy (i)-Vcy_ are obtained
ave)；
(3) judge whether relay has occurred normal off failure according to the size of RMS (Vcy (i)-Vcy_ave) value.According to
Known to step (5) analysis in the viscous breakdown judge of relay：If normal off failure, RMS (Vcy (i)-has occurred in S1 or S2
Vcy_ave) be one close to 0 numerical value；If relay normally inhale and, RMS (Vcy (i)-Vcy_ave) be partial pressure CY electricity
The period root-mean-square value of network voltage in appearance.A judgement relay normal off fault threshold △ can be set according to the above analysis
V2, if RMS (Vcy (i)-Vcy_ave)<△ V2 then can determine that normal off failure has occurred in S1 or S2；If RMS (Vcy (i)-
Vcy_ave)>△ V2 then can determine that normal off failure does not occur for S1 and S2.
In conjunction with above-mentioned specific embodiment it is found that judging that two kinds of failures of relay only need to acquire on CY capacitances in this programme
One voltage, sample circuit is few, can save hardware cost and digital processing resources of chip, while above-mentioned for judging relay
Threshold value △ V1 and the △ V2 of failure is since feature is apparent, and relatively good given, relay test result is reliable.
On the basis of the above embodiments, the present embodiment additionally provides dress corresponding with above-mentioned relay failure detection method
It sets, which is applied to photovoltaic synchronization inverter system, and the photovoltaic synchronization inverter system includes bus capacitor, the first electricity
Appearance, inversion unit, the first relay, the second relay and LCL filter modules, the bus capacitor have mid-point, institute
Stating photovoltaic synchronization inverter system, there is neutral point of electric network, first capacitance output in the photovoltaic combining inverter is arranged
Between cathode and ground.As shown in fig. 7, the relay failure detection device includes：
First control module 71 is closed for controlling first relay, is controlled second relay and is disconnected；
First acquisition module 72, the voltage value of first capacitance for obtaining preset period of time, when described default
Between the period include at least one grid cycle；
First determining module 73 is used for according to the direct current score value of the voltage value and the exchange score value of the voltage value,
Determine first object value；
Second determining module 74 is used for when first object value fault threshold viscous less than or equal to default relay,
Determine that viscous failure does not occur for first relay, when the first object value is more than the viscous failure threshold of the default relay
When value, determine that viscous failure occurs for first relay.
Optionally, relay failure detection device provided in this embodiment can also include：
Second control module is closed for controlling first relay and second relay；
Second acquisition module, the voltage value of first capacitance for obtaining preset period of time, the preset time
Period includes at least one grid cycle；
Third determining module is used for according to the direct current score value of the voltage value and the exchange score value of the voltage value, really
Fixed second desired value；
4th determining module is used for when second desired value is less than or equal to default relay normal off fault threshold, really
Normal off failure occurs for fixed first relay or second relay, when second desired value is more than the default relay
When device normal off fault threshold, determine that normal off failure does not occur for first relay and second relay.
Except this, third determining module may include：
First determination unit, for determining that the average value of the voltage value of first capacitance is the direct current score value；
Second determination unit, the period for determining the direct current score value and the difference for exchanging score value of first capacitance
Root-mean-square value is the first object value.
Wherein, the viscous fault threshold of the default relay and the default relay normal off fault threshold are all higher than 0
Less than or equal to the period root-mean-square value of network voltage on the first capacitance.
The operation principle of the device refers to above method embodiment, herein not repeated description.
On the basis of the above embodiments, the present embodiment additionally provides a kind of relay failure inspection of photovoltaic combining inverter
Examining system, including relay failure detection device that any one is above-mentioned.
In conclusion an embodiment of the present invention provides a kind of relay failure detection method of photovoltaic combining inverter, it is first
It first controls first relay to be closed, controls second relay and disconnect.Then described the of preset period of time is obtained
The voltage value of one capacitance, and according to the direct current score value of the voltage value and the exchange score value of the voltage value, determine the first mesh
Scale value.When the first object value, which is less than or equal to default relay, glues viscous fault threshold, determine that first relay is not sent out
Raw viscous failure determines first relay when the first object value, which is more than the default relay, glues viscous fault threshold
Viscous failure occurs for device.As it can be seen that then this programme is compared by the voltage value of the first capacitance of detection with predetermined threshold value, into
And determine whether relay breaks down.A voltage need to be only acquired, can be saved at the cost and number of detection hardware
The resource of chip is managed, and since predetermined threshold value feature is apparent, judging result is reliable, to improve the accuracy of detection.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related place is said referring to method part
It is bright.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, depends on the specific application and design constraint of technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of this invention.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can directly be held with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest range caused.
Claims (10)
1. a kind of relay failure detection method of photovoltaic combining inverter, which is characterized in that be applied to photovoltaic combining inverter
System, the photovoltaic synchronization inverter system include bus capacitor, the first capacitance, inversion unit, the first relay, the second relay
There is mid-point, the photovoltaic synchronization inverter system to have neutral point of electric network for device and filter module, the bus capacitor
The relay failure detection method includes：
It controls first relay to be closed, controls second relay and disconnect；
The voltage value of first capacitance of preset period of time is obtained, the preset period of time includes at least one power grid week
Phase；
According to the direct current score value of the voltage value and the exchange score value of the voltage value, first object value is determined；
When the first object value, which is less than or equal to default relay, glues viscous fault threshold, determine that first relay does not occur
Viscous failure determines first relay when the first object value, which is more than the default relay, glues viscous fault threshold
Viscous failure occurs.
2. relay failure detection method according to claim 1, which is characterized in that further include：
It controls second relay to be closed, controls first relay and disconnect；
The voltage value of first capacitance of preset period of time is obtained, the preset period of time includes at least one power grid week
Phase；
According to the direct current score value of the voltage value and the exchange score value of the voltage value, the first object value is determined；
When the first object value, which is less than or equal to default relay, glues viscous fault threshold, determine that second relay does not occur
Viscous failure determines second relay when the first object value, which is more than the default relay, glues viscous fault threshold
Viscous failure occurs.
3. relay failure detection method according to claim 1 or 2, which is characterized in that described according to the voltage value
Direct current score value and the voltage value exchange score value, determine first object value, including：
Determine that the average value of the voltage value of first capacitance is the direct current score value；
Determine that the direct current score value and the period root-mean-square value of the difference for exchanging score value of first capacitance are first mesh
Scale value.
4. relay failure detection method according to claim 1 or 2, which is characterized in that the default relay is viscous
Fault threshold and the default relay normal off fault threshold were all higher than for 0 period for being less than or equal to network voltage on the first capacitance
Root-mean-square value.
5. a kind of relay failure detection method of photovoltaic combining inverter, which is characterized in that be applied to photovoltaic combining inverter
System, the photovoltaic synchronization inverter system include bus capacitor, the first capacitance, inversion unit, the first relay, the second relay
There is mid-point, the photovoltaic synchronization inverter system to have neutral point of electric network for device and filter module, the bus capacitor,
The relay failure detection method includes：
It controls first relay and second relay is closed；
The voltage value of first capacitance of preset period of time is obtained, the preset period of time includes at least one power grid week
Phase；
According to the direct current score value of the voltage value and the exchange score value of the voltage value, the second desired value is determined；
When second desired value is less than or equal to default relay normal off fault threshold, first relay or described is determined
Normal off failure occurs for the second relay, when second desired value is more than the default relay normal off fault threshold, determines
Normal off failure does not occur for first relay and second relay.
6. a kind of relay failure detection device of photovoltaic combining inverter, which is characterized in that be applied to photovoltaic combining inverter
System, the photovoltaic synchronization inverter system include bus capacitor, the first capacitance, inversion unit, the first relay, the second relay
There is mid-point, the photovoltaic synchronization inverter system to have neutral point of electric network for device and filter module, the bus capacitor,
The relay failure detection device includes：
First control module is closed for controlling first relay, is controlled second relay and is disconnected；
First acquisition module, the voltage value of first capacitance for obtaining preset period of time, the preset period of time
Including at least one grid cycle；
First determining module, for according to the direct current score value of the voltage value and the exchange score value of the voltage value, determining the
One desired value；
Second determining module, for when the first object value glues viscous fault threshold less than or equal to default relay, determining institute
It states the first relay and viscous failure does not occur, when the first object value, which is more than the default relay, glues viscous fault threshold,
Determine that viscous failure occurs for first relay.
7. relay failure detection device according to claim 6, which is characterized in that the third determining module includes：
First determination unit, for determining that the average value of the voltage value of first capacitance is the direct current score value；
Second determination unit, for determining that the direct current score value and the period of the difference for exchanging score value of first capacitance are square
Root is the first object value.
8. relay failure detection device according to claim 6, which is characterized in that the viscous failure of the default relay
It is square less than or equal to the period of network voltage on the first capacitance that threshold value and the default relay normal off fault threshold are all higher than 0
Root.
9. a kind of relay failure detection device of photovoltaic combining inverter, which is characterized in that including：
Second control module is closed for controlling first relay and second relay；
Second acquisition module, the voltage value of first capacitance for obtaining preset period of time, the preset period of time
Including at least one grid cycle；
Third determining module, for according to the direct current score value of the voltage value and the exchange score value of the voltage value, determining the
Two desired values；
4th determining module, for when second desired value is less than or equal to default relay normal off fault threshold, determining institute
It states the first relay or normal off failure occurs for second relay, when second desired value is normal more than the default relay
When disconnected fault threshold, determine that normal off failure does not occur for first relay and second relay.
10. a kind of relay failure detecting system of photovoltaic combining inverter, which is characterized in that including in such as claim 6-9
Relay failure detection device described in any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810305928.9A CN108761319B (en) | 2018-04-08 | 2018-04-08 | Relay failure detection method, device and system for photovoltaic grid-connected inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810305928.9A CN108761319B (en) | 2018-04-08 | 2018-04-08 | Relay failure detection method, device and system for photovoltaic grid-connected inverter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108761319A true CN108761319A (en) | 2018-11-06 |
| CN108761319B CN108761319B (en) | 2020-08-28 |
Family
ID=63981136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810305928.9A Active CN108761319B (en) | 2018-04-08 | 2018-04-08 | Relay failure detection method, device and system for photovoltaic grid-connected inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108761319B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN112072699A (en) * | 2020-09-03 | 2020-12-11 | 深圳市禾望科技有限公司 | Photovoltaic inverter and control method thereof |
| 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 |
| CN113238146A (en) * | 2021-05-12 | 2021-08-10 | 阳光电源股份有限公司 | Neutral relay fault detection method and device of energy storage inverter system |
| CN113970357A (en) * | 2021-11-30 | 2022-01-25 | 河南职业技术学院 | Power switch cabinet detection circuit based on Internet of things |
| CN114137405A (en) * | 2021-11-25 | 2022-03-04 | 沃太能源股份有限公司 | Fault detection method for relay device and device thereof |
| CN115184838A (en) * | 2022-09-08 | 2022-10-14 | 深圳市云天数字能源有限公司 | Relay short circuit failure detection method and device |
| CN115327358A (en) * | 2022-08-05 | 2022-11-11 | 小米汽车科技有限公司 | Relay state determination method and device, electronic equipment and storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001218474A (en) * | 2000-01-31 | 2001-08-10 | Yaskawa Electric Corp | Method and apparatus for detecting ground fault of inverter |
| CN102540070A (en) * | 2012-02-08 | 2012-07-04 | 广东易事特电源股份有限公司 | Control and detection circuit for four relays and detection method thereof |
| CN102565691A (en) * | 2011-12-14 | 2012-07-11 | 广州三晶电气有限公司 | Relay failure detection device and method for grid-connected inverter |
| WO2013176348A1 (en) * | 2012-05-24 | 2013-11-28 | 아주대학교산학협력단 | Apparatus and method for diagnosis of fault of 3-level t type inverter switch |
| CN104682432A (en) * | 2015-02-27 | 2015-06-03 | 广东易事特电源股份有限公司 | Method for detecting failure of relays and protecting filter capacitors of photovoltaic grid-connected inverters |
-
2018
- 2018-04-08 CN CN201810305928.9A patent/CN108761319B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001218474A (en) * | 2000-01-31 | 2001-08-10 | Yaskawa Electric Corp | Method and apparatus for detecting ground fault of inverter |
| CN102565691A (en) * | 2011-12-14 | 2012-07-11 | 广州三晶电气有限公司 | Relay failure detection device and method for grid-connected inverter |
| CN102540070A (en) * | 2012-02-08 | 2012-07-04 | 广东易事特电源股份有限公司 | Control and detection circuit for four relays and detection method thereof |
| WO2013176348A1 (en) * | 2012-05-24 | 2013-11-28 | 아주대학교산학협력단 | Apparatus and method for diagnosis of fault of 3-level t type inverter switch |
| CN104682432A (en) * | 2015-02-27 | 2015-06-03 | 广东易事特电源股份有限公司 | Method for detecting failure of relays and protecting filter capacitors of photovoltaic grid-connected inverters |
Non-Patent Citations (1)
| Title |
|---|
| 谢少军 等: "并网逆变器电网阻抗检测技术综述", 《电网技术》 * |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN112072699A (en) * | 2020-09-03 | 2020-12-11 | 深圳市禾望科技有限公司 | Photovoltaic inverter and control method thereof |
| WO2022156124A1 (en) * | 2021-01-21 | 2022-07-28 | 浙江艾罗网络能源技术股份有限公司 | Failure detection method for relay of three-phase grid-connected inverter |
| 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 |
| EP4033263A1 (en) | 2021-01-21 | 2022-07-27 | Solar Power Network Technology (Zhejiang) Co., Ltd. | Method for testing the relay failure of a three-phase grid-connected 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 |
| CN113238146A (en) * | 2021-05-12 | 2021-08-10 | 阳光电源股份有限公司 | Neutral relay fault detection method and device of energy storage inverter system |
| CN113238146B (en) * | 2021-05-12 | 2022-05-24 | 阳光电源股份有限公司 | Neutral relay fault detection method and device of energy storage inverter system |
| CN114137405A (en) * | 2021-11-25 | 2022-03-04 | 沃太能源股份有限公司 | Fault detection method for relay device and device thereof |
| CN113970357A (en) * | 2021-11-30 | 2022-01-25 | 河南职业技术学院 | Power switch cabinet detection circuit based on Internet of things |
| CN113970357B (en) * | 2021-11-30 | 2023-06-23 | 河南职业技术学院 | Power switch cabinet detection circuit based on Internet of things |
| CN115327358A (en) * | 2022-08-05 | 2022-11-11 | 小米汽车科技有限公司 | Relay state determination method and device, electronic equipment and storage medium |
| CN115184838A (en) * | 2022-09-08 | 2022-10-14 | 深圳市云天数字能源有限公司 | Relay short circuit failure detection method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108761319B (en) | 2020-08-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108761319A (en) | Relay failure detection method, device and the system of photovoltaic combining inverter | |
| JP6357679B2 (en) | Method and apparatus for ground fault detection | |
| CN104267288B (en) | HVDC commutation failure method for diagnosing faults based on threshold voltage or valve electric current | |
| CN102419400B (en) | Method for detecting input phase failure of three-phase input device | |
| CN104682432A (en) | Method for detecting failure of relays and protecting filter capacitors of photovoltaic grid-connected inverters | |
| CN105717368A (en) | Online monitoring method for DC-link capacitor of three-phase system | |
| CN109459618A (en) | The online capacitance detection method of the standard of electric drive system for electric vehicles dc-link capacitance | |
| CN110927631B (en) | Polarity judgment method for zero-sequence current transformer | |
| CN103278727A (en) | Output power-based diagnosis method for open-circuit fault of insulated gate bipolar transistor (IGBT) of three-phase inverter | |
| CN109752625A (en) | High-voltage direct-current commutation failure detection method and device based on current conversion transformer side current | |
| CN207198238U (en) | Power grid frequency detection circuit | |
| CN107210153A (en) | Method for the electrically operated time of estimating circuit breaker | |
| CN106597217A (en) | MMC-HVDC alternating current side asymmetric fault diagnosis method | |
| CN105353261B (en) | Open phase fault detection method, device and a kind of automatic change-over | |
| CN110879318A (en) | Commercial power abnormity detection method | |
| CN110501580A (en) | A kind of Phase Faults method and apparatus | |
| CN101713799A (en) | Method for distinguishing three-phase alternating current phase sequences | |
| CN106597272B (en) | Two level STATCOM switching device open-circuit fault localization methods | |
| CN100403616C (en) | Phase defect testing method for three phase power supply | |
| CN107238750B (en) | A kind of network wave method for detecting based on operational amplifier circuit | |
| CN113253108B (en) | Three-phase relay detection method, device, equipment and computer readable storage medium | |
| CN111835033A (en) | Self-checking method and system applied to network side relay topology in energy storage inverter | |
| CN104977479B (en) | Three-phase electricity condition detection apparatus, method and electric system | |
| CN111025182A (en) | STM32F103T 6-based instantaneous ground fault finder | |
| CN102393482A (en) | Grid-connected inverter and circuit for detecting island thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |