CN110412456A - A kind of the relay fault detection method and photovoltaic energy storage system of photovoltaic energy storage system - Google Patents
A kind of the relay fault detection method and photovoltaic energy storage system of photovoltaic energy storage system Download PDFInfo
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- CN110412456A CN110412456A CN201910627918.1A CN201910627918A CN110412456A CN 110412456 A CN110412456 A CN 110412456A CN 201910627918 A CN201910627918 A CN 201910627918A CN 110412456 A CN110412456 A CN 110412456A
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- 230000005611 electricity Effects 0.000 claims description 3
- 238000003860 storage Methods 0.000 description 7
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
- H02S10/20—Systems characterised by their energy storage means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention discloses a kind of relay fault detection method of photovoltaic energy storage system and photovoltaic energy storage systems, this method comprises: control energy storage inverter inverter side exports the sine wave V of the first default amplitude；Acquire the sampled signal Inv between energy storage inverter inverter side and relayM；Detection sampled signal Inv whether be the first default amplitude sine wave V；When sampled signal Inv is the sine wave V of the first default amplitude, state is opened or closed according to relay switch between sampled signal Inv and energy storage inverter and network system, determines that relay switch between energy storage inverter and network system can not be closed at failure with the presence or absence of gluing dead failure or multiple relay switches.The relay fault detection method and photovoltaic energy storage system of photovoltaic energy storage system disclosed by the invention, the relay switch being able to confirm that in photovoltaic energy storage system is with the presence or absence of problem that is viscous dead or not closing.
Description
Technical field
Present document relates to photovoltaic energy storage field, the relay fault detection method and photovoltaic of espespecially a kind of photovoltaic energy storage system are stored up
It can system.
Background technique
In photovoltaic energy storage system, energy storage inverter can be divided into off-network and grid-connected two parts, off-network and grid-connected two
Part system can be switched fast according to power system conditions, and handoff procedure mainly passes through the realization of relay at present.
Therefore, in entire photovoltaic energy storage system, the quality of relay determines photovoltaic energy storage system whether normal operation
Work, it is necessary to whether there is failure in grid-connected preceding confirmation relay.
Summary of the invention
In a first aspect, this application provides a kind of relay fault detection method of photovoltaic energy storage system, the photovoltaic storage
Can system include energy storage inverter, network system and local load system, between the energy storage inverter and the network system,
Divide between the network system and the local load system and between the energy storage inverter and the local load system
Not Tong Guo the connection of one group of transmission line, be in series with a main relay group on every group of transmission line, be respectively labeled as relayM,
RelayM1 and relayM2, each main relay, which comprises
Control the sine wave V that the energy storage inverter inverter side exports the first default amplitude；
Acquire the sampled signal Inv between the energy storage inverter inverter side and relayM；
Detect the sampled signal Inv whether be the first default amplitude sine wave V；
When the sampled signal Inv is the sine wave V of the first default amplitude, according to sampled signal Inv and the energy storage
State is opened or closed in relay switch between inverter and the network system, determines the energy storage inverter and the electricity
Relay switch between net system can not be closed at failure with the presence or absence of gluing dead failure or multiple relay switches.
Second aspect, this application provides a kind of photovoltaic energy storage systems, comprising: energy storage inverter, network system and local
Load system；
Between the energy storage inverter and the network system, between the network system and the local load system with
And be connected to respectively by one group of transmission line between the energy storage inverter and the local load system, on every group of transmission line
It is in series with a main relay group, is respectively labeled as relayM, relayM1 and relayM2, each main relay group includes two
Relay switch, two relay switches are respectively arranged on the zero curve and firewire of transmission line；
The photovoltaic energy storage system further include: master control system, the master control system is for executing such as first aspect embodiment
The relay fault detection method of the photovoltaic energy storage system.
The application provides the relay fault detection method and photovoltaic energy storage system of a kind of photovoltaic energy storage system, inverse in energy storage
When the sampled signal Inv for becoming device inverter side is the sine wave V of the first default amplitude, according to sampled signal Inv and energy storage inverter
State is opened or closed in relay switch between network system, can determine between energy storage inverter and network system after
Electric switch can not be closed at failure with the presence or absence of gluing dead failure or multiple relay switches, to ensure photovoltaic energy storage system
Normal operation.
Other features and advantage will illustrate in the following description, also, partly become from specification
It obtains it is clear that being understood and implementing the application.Other advantages of the application can be by specification and attached drawing
Described scheme is achieved and obtained.
Detailed description of the invention
Attached drawing is used to provide the understanding to technical scheme, and constitutes part of specification, with the application's
Embodiment is used to explain the technical solution of the application together, does not constitute the limitation to technical scheme.
Fig. 1 is the structural schematic diagram for the photovoltaic energy storage system that the embodiment of the present invention one provides；
Fig. 2 is the flow chart of the relay fault detection method for the photovoltaic energy storage system that the embodiment of the present invention one provides；
Fig. 3 is the structural schematic diagram of photovoltaic energy storage system provided by Embodiment 2 of the present invention；
Fig. 4 is the flow chart of the relay fault detection method of photovoltaic energy storage system provided by Embodiment 2 of the present invention.
Specific embodiment
This application describes multiple embodiments, but the description is exemplary, rather than restrictive, and for this
It is readily apparent that can have more in the range of embodiments described herein includes for the those of ordinary skill in field
More embodiments and implementation.Although many possible feature combinations are shown in the attached drawings, and in a specific embodiment
It is discussed, but many other combinations of disclosed feature are also possible.Unless the feelings specially limited
Other than condition, any feature or element of any embodiment can be with any other features or element knot in any other embodiment
It closes and uses, or any other feature or the element in any other embodiment can be substituted.
The application includes and contemplates the combination with feature known to persons of ordinary skill in the art and element.The application is
It can also combine with any general characteristics or element through disclosed embodiment, feature and element, be defined by the claims with being formed
Unique scheme of the invention.Any feature or element of any embodiment can also be with features or member from other scheme of the invention
Part combination, to form the unique scheme of the invention that another is defined by the claims.It will thus be appreciated that showing in this application
Out and/or any feature of discussion can be realized individually or in any suitable combination.Therefore, in addition to according to appended right
It is required that and its other than the limitation done of equivalent replacement, embodiment is not limited.Furthermore, it is possible in the guarantor of appended claims
It carry out various modifications and changes in shield range.
In addition, method and/or process may be rendered as spy by specification when describing representative embodiment
Fixed step sequence.However, in the degree of this method or process independent of the particular order of step described herein, this method
Or process should not necessarily be limited by the step of particular order.As one of ordinary skill in the art will appreciate, other steps is suitable
Sequence is also possible.Therefore, the particular order of step described in specification is not necessarily to be construed as limitations on claims.This
Outside, the claim for this method and/or process should not necessarily be limited by the step of executing them in the order written, art technology
Personnel are it can be readily appreciated that these can sequentially change, and still remain in the spirit and scope of the embodiment of the present application.
The present invention provides a kind of relay failure detection schemes of photovoltaic energy storage system, main to confirm in photovoltaic energy storage system
Each relay switch with the presence or absence of problem that is viscous dead or not closing.
Fig. 1 is the structural schematic diagram for the photovoltaic energy storage system that the embodiment of the present invention one provides, as shown in Figure 1, the present invention is real
Apply the photovoltaic energy storage system of example offer, comprising: energy storage inverter, network system and local load system, energy storage inverter and electricity
Pass through respectively between net system, between network system and local load system and between energy storage inverter and local load system
One group of transmission line is connected to, and is in series with a main relay group on every group of transmission line, is respectively labeled as relayM, relayM1
And relayM2, each main relay group include two relay switches, two relay switches are respectively arranged on the zero of transmission line
On line N and firewire L.
Specifically, as shown in Figure 1, energy storage inverter and network system include main relay group relayM, wherein Relay1
Main relay group relayM is constituted with Relay2.Network system and local load system include main relay group relayM1,
In, Relay5 and Relay6 constitute main relay group relayM1.Energy storage inverter and local load system are by main relay group
RelayM2, wherein Relay9 and Relay10 constitutes main relay group relayM2.In energy storage inverter inverter side and relayM
Between sampled signal, be properly termed as sampled signal Inv；Sampled signal between network system and relayM, is properly termed as
Sampled signal Grid0；Sampled signal between relayM1 and local load system, is properly termed as sampled signal Load0.
The embodiment of the invention also provides a kind of relay fault detection methods of photovoltaic energy storage system.Optionally, this hair
The photovoltaic energy storage system that bright embodiment provides can also include master control system, master control system be used to execute photovoltaic energy storage system after
Electric appliance fault detection method.
Fig. 2 is the flow chart of the relay fault detection method for the photovoltaic energy storage system that the embodiment of the present invention one provides, such as
Shown in Fig. 2, the relay fault detection method of photovoltaic energy storage system provided in an embodiment of the present invention may include:
S201: control energy storage inverter inverter side exports the sine wave V of the first default amplitude.
In the present embodiment, the sine wave V of driving energy storage inverter inverter side output fixed amplitude is inverse by energy storage inverter
Become the sampled signal Inv of side, to determine whether that relay switch breaks down.
Optionally, before the sine wave V of the first default amplitude of control energy storage inverter inverter side output, can also include:
Disconnect all relay switches in photovoltaic energy storage system.Than as shown in figure 1 Relay1, Relay2, Relay5, Relay6,
Relay1-Relay11 in Relay9 and Relay10 or following Fig. 3.
S202: the sampled signal Inv between acquisition energy storage inverter inverter side and relayM.
In the present embodiment, the acquisition principle of sampled signal Inv is same as the prior art, and the present embodiment is herein without superfluous
It states.
S203: detection sampled signal Inv whether be the first default amplitude sine wave V.
In the present embodiment, the sampled signal Inv based on energy storage inverter inverter side determines whether that relay switch occurs
It, specifically can be by the way that sampled signal Inv be compared with the sine wave V of the first default amplitude, therefore, it is determined that relay when failure
The fault type of device switch.
In the present embodiment, the range value of sampled signal Inv and the first default amplitude of sine wave V are identical, and/or, sampling
When the waveform of signal Inv is identical as the waveform of sine wave V, determine that sampled signal Inv is the sine wave V of the first default amplitude；It is no
Then, determining sampled signal Inv not is the sine wave V of the first default amplitude.
S204: when sampled signal Inv is the sine wave V of the first default amplitude, according to sampled signal Inv and energy storage inversion
The relay that state is opened or closed, determines between energy storage inverter and network system of relay switch between device and network system
Device switch can not be closed at failure with the presence or absence of gluing dead failure or multiple relay switches.
In the present embodiment, when sampled signal Inv is the sine wave V of the first default amplitude, energy storage inverter can control
One of relay switch in all relay switches between network system is in an off state, remaining relay is opened
It closes and is in closed state, judge that the relay switch of the disconnection whether there is according to sampled signal Inv and glue dead failure.It is specific real
Existing mode can embodiment as described below description, the present embodiment is herein without repeating.
When sampled signal Inv is the sine wave V of the first default amplitude, energy storage inverter and network system also can control
Between all relay switches be in closed state, according to sampled signal Inv judge closure all relay switches whether
In the presence of failure can not be closed at.Its specific implementation can embodiment as described below description, the present embodiment herein without
It repeats.
Optionally, the relay fault detection method of photovoltaic energy storage system provided in an embodiment of the present invention can also include:
When sampled signal Inv is not the sine wave V of the first default amplitude, determining the inverter bridge leg of energy storage inverter, there are failures.
The relay fault detection method of photovoltaic energy storage system provided in an embodiment of the present invention, in energy storage inverter inverter side
Sampled signal Inv when being the sine wave V of the first default amplitude, according to sampled signal Inv and energy storage inverter and network system
Between relay switch state is opened or closed, can determine that the relay switch between energy storage inverter and network system is
Dead failure or multiple relay switches are glued in no presence can not be closed at failure, to ensure the normal fortune of photovoltaic energy storage system
Row.
Further, in the above-described embodiments, it is based on photovoltaic energy storage system shown in FIG. 1, according to sampled signal Inv and storage
State can be opened or closed by relay switch between inverter and network system, determine between energy storage inverter and network system
Relay switch can not be closed at failure with the presence or absence of gluing dead failure or multiple relay switches, may include following two
At least one of implementation:
The first implementation: control energy storage inverter inverter side stops the sine wave V of the first default amplitude of output, and
One of relay switch in control relayM is in an off state, another relay switch is in closed state；Sentence
Whether disconnected sampled signal Inv is equal to sampled signal Grid0, and sampled signal Grid0 is the sampling between network system and relayM
Signal；When sampled signal Inv is equal to sampled signal Grid0, determine that the relay switch disconnected in relayM has viscous dead event
Barrier.
In the present embodiment, when sampled signal Inv is the sine wave V of the first default amplitude, inverter side output is closed in driving
At the sine wave V of fixed amplitude, and one of relay switch (such as Relay1) of driving main relay group relayM
In closed state, another relay switch (such as Relay2) is in an off state.Then judge sampled signal Inv whether etc.
In sampled signal Grid0, if it is, there is viscous dead event in the relay switch (such as Relay2) that explanation is in an off state
Barrier.
The relay fault detection method of photovoltaic energy storage system provided in an embodiment of the present invention, in energy storage inverter inverter side
Sampled signal Inv when being the sine wave V of the first default amplitude, drive a relay between energy storage inverter and network system
Device switch is in an off state, remaining relay switch is in closed state, according to the sampled signal of energy storage inverter inverter side
Inv can determine the relay switch between energy storage inverter and network system with the presence or absence of dead failure is glued, to ensure photovoltaic
The normal operation of energy-storage system.
Second of implementation: control energy storage inverter inverter side stops the sine wave V of the first default amplitude of output, and
All relay switches in control relayM are in closed state；Judge whether sampled signal Inv is equal to sampled signal
Grid0, sampled signal Grid0 are the sampled signals between network system and relayM；In sampled signal Inv not equal to sampling letter
When number Grid0, determine that two relay switches in relayM can not be closed at.
In the present embodiment, when sampled signal Inv is the sine wave V of the first default amplitude, inverter side output is closed in driving
All relay switches in the sine wave V of fixed amplitude, and driving main relay group relayM are in closed state, i.e.,
Relay1 and Relay2 are in closed state.Then judge whether sampled signal Inv is equal to sampled signal Grid0, if not
It is then to determine that two relay switches can not be closed at, for example, Relay1 and Relay2 presence can not be closed at event
Barrier.
The relay fault detection method of photovoltaic energy storage system provided in an embodiment of the present invention, in energy storage inverter inverter side
Sampled signal Inv when being the sine wave V of the first default amplitude, drive all relays between energy storage inverter and network system
Device switch can determine that multiple relay switches are deposited according to the sampled signal Inv of energy storage inverter inverter side in closed state
It can not be closed at failure, to ensure the normal operation of photovoltaic energy storage system.
Fig. 3 is the structural schematic diagram of photovoltaic energy storage system provided by Embodiment 2 of the present invention, as shown in figure 3, shown in Fig. 1
On the basis of embodiment, photovoltaic energy storage system provided in an embodiment of the present invention can also include: to be additionally provided on every group of transmission line
One and the concatenated secondary relay group of main relay group, are respectively labeled as relayS, relayS1 and relayS2；RelayS and
RelayS1 respectively includes two relay switches, and two relay switches are respectively arranged on the zero curve and firewire of transmission line,
RelayS2 includes the relay switch being set on transmission line zero curve.
In the present embodiment, 11 relays and three voltage sampling signals can be used, to confirm photovoltaic energy storage system
Each of relay switch with the presence or absence of problem that is viscous dead or not closing.Specifically, as shown in figure 3, energy storage inverter
Include main relay group relayM and secondary relay group relayS with network system, wherein Relay1 and Relay2 constitute it is main after
Electric appliance group relayM, Relay3 and Relay4 constitute secondary relay group relayS.Network system and local load system include master
Relay group relayM1 and secondary relay group relayS1, wherein Relay5 and Relay6 constitutes main relay group relayM1,
Relay7 and Relay8 constitutes secondary relay group relayS1.Energy storage inverter and local load system are by main relay group
RelayM2 and secondary relay group relayS2, wherein Relay9 and Relay10 constitutes main relay group relayM2, Relay11
Constitute secondary relay group relayS2.Sampled signal between energy storage inverter inverter side and relayM is properly termed as sampling letter
Number Inv；Sampled signal between network system and relayS, is properly termed as sampled signal Grid；It is in relayS1 and locally negative
Sampled signal between loading system is properly termed as sampled signal Load.
Based on photovoltaic energy storage system shown in Fig. 3, the embodiment of the invention also provides a kind of relays of photovoltaic energy storage system
Device fault detection method.On the basis of embodiment shown in Fig. 2, the relay of photovoltaic energy storage system provided in an embodiment of the present invention
Fault detection method is opened or closed according to relay switch between sampled signal Inv and energy storage inverter and network system
State determines that the relay switch between energy storage inverter and network system whether there is and glues dead failure or multiple relay switches
It can not be closed at failure, may include at least one of following two implementation:
The first implementation: control energy storage inverter inverter side stops the sine wave V of the first default amplitude of output, and
One of relay switch in control relayM or relayS is in an off state, remaining relay switch is in closed form
State；Judge whether sampled signal Inv is equal to sampled signal Grid, sampled signal Grid is adopting between network system and relayS
Sample signal；When sampled signal Inv is equal to sampled signal Grid, determine that the relay switch disconnected in relayM or relayS is deposited
Gluing dead failure.
In the present embodiment, when sampled signal Inv is the sine wave V of the first default amplitude, inverter side output is closed in driving
Any one relay switch between the sine wave V of fixed amplitude, and driving energy storage inverter and network system, which is in, to be disconnected
State, remaining relay switch are in closed state.Then judge whether sampled signal Inv is equal to sampled signal Grid, if
It is then to illustrate that the relay switch being in an off state exists to glue dead failure.
For example, determine that the Relay3 in relayS whether there is and glue dead failure.Specifically, driving closing inverter side is defeated
The sine wave V of fixed amplitude out, Relay1, Relay2 of driving closure main relay group relayM and secondary relay group relayS
In Relay4, driving disconnects the Relay3 in secondary relay group relayS；Judge whether sampled signal Inv is equal to sampled signal
Grid, if it is, determining that Relay3 exists glues dead failure.
Wherein, the present embodiment can detect one or more relays in relayM and relayS according to actual needs
Switch, which whether there is, glues dead failure.When the relay switch for needing to detect in relayM and relayS is one, then driving is disconnected
The relay switch for needing to detect is opened, and drives remaining relay switch in closure relayM and relayS.
When the relay switch for needing to detect in relayM and relayS is multiple, then drives and disconnect according to preset order
One relay switch, and drive remaining relay switch in closure relayM and relayS.Wherein, preset order can
With but be not limited only to be the first relay switch in secondary relay group, the relay switch in rear main relay group；And/or in advance
If sequence can be with it is not limited to be the relay switch on first firewire L, the relay switch on rear zero curve N.For example,
Four relay switches in relayM and relayS are required to detect whether to exist to glue dead failure, can first detect Relay3
(at this point, disconnect Relay3, be closed Relay4, Relay1 and Relay2), then successively detect Relay4, Relay1 and
Relay2。
The relay fault detection method of photovoltaic energy storage system provided in an embodiment of the present invention, in energy storage inverter inverter side
Sampled signal Inv when being the sine wave V of the first default amplitude, drive a relay between energy storage inverter and network system
Device switch is in an off state, remaining relay switch is in closed state, by the sampled signal Inv of energy storage inverter inverter side
Sampled signal Grid between network system and relayS is compared, and can determine between energy storage inverter and network system
Relay switch with the presence or absence of gluing dead failure, to ensure the normal operation of photovoltaic energy storage system.
Second of implementation: control energy storage inverter inverter side stops the sine wave V of the first default amplitude of output, and
All relay switches in control relayM and relayS are in closed state；Judge whether sampled signal Inv is equal to sampling
Signal Grid, sampled signal Grid are the sampled signals between network system and relayS；In sampled signal Inv not equal to sampling
When signal Grid, determine that four relay switches in relayM and relayS can not be closed at.
In the present embodiment, when sampled signal Inv is the sine wave V of the first default amplitude, inverter side output is closed in driving
All relay switches in the sine wave V of fixed amplitude, and driving main relay group relayM and relayS are in closure
State, i.e. Relay3, Relay4, Relay1 and Relay2 are in closed state.Then judge whether sampled signal Inv is equal to
Sampled signal Grid, if it is not, then determine that four relay switches can not be closed at, for example, Relay3, Relay4,
Relay1 and Relay2 presence can not be closed at failure.
The relay fault detection method of photovoltaic energy storage system provided in an embodiment of the present invention, in energy storage inverter inverter side
Sampled signal Inv when being the sine wave V of the first default amplitude, drive all relays between energy storage inverter and network system
Device switch is in closed state, by adopting between the sampled signal Inv and network system and relayS of energy storage inverter inverter side
Sample signal Grid is compared, and can determine multiple relay switches in the presence of that can not be closed at failure, to ensure that photovoltaic stores up
The normal operation of energy system.
Further, in the above-described embodiments, the relay failure inspection of photovoltaic energy storage system provided in an embodiment of the present invention
Survey method, can also include: according between sampled signal Inv and energy storage inverter and local load system relay switch it is disconnected
It opens or closed state, determines relay switch between energy storage inverter and local load system with the presence or absence of gluing dead failure or more
A relay switch can not be closed at failure.
In the present embodiment, its in all relay switches between energy storage inverter and local load system can control
In a relay switch be in an off state, remaining relay switch is in closed state, according to sampled signal Inv judgement should
The relay switch of disconnection, which whether there is, glues dead failure.
Specifically, according to the disconnection of relay switch between sampled signal Inv and energy storage inverter and local load system
Or closed state, it determines that the relay switch between energy storage inverter and local load system whether there is and glues dead failure or multiple
Relay switch can not be closed at failure, may include at least one of following two implementation:
The first implementation: control energy storage inverter inverter side exports the sine wave V1 of the second default amplitude, and control
One of relay switch in relayM2 or relayS2 processed is in an off state, remaining relay switch is in closed form
State；Judge whether sampled signal Inv is equal to sampled signal Load, sampled signal Load be local load system and relayS1 it
Between sampled signal；When sampled signal Inv is equal to sampled signal Load, the relay disconnected in relayM2 or relayS2 is determined
Device switch, which exists, glues dead failure.
In the present embodiment, driving inverter side exports the sine wave V1 of the second default amplitude, and the second default amplitude is 36V or so
Safe voltage；And any one relay switch between energy storage inverter and local load system is in an off state,
Remaining relay switch is in closed state.Then judge whether sampled signal Inv is equal to sampled signal Load, if it is, saying
The bright relay switch being in an off state, which exists, glues dead failure.
For example, determine that the Relay11 in relayS2 whether there is and glue dead failure.Specifically, driving inverter side output
The sine wave V1 of fixed amplitude, the Relay9 and Relay10 of driving closure main relay group relayM2, driving disconnect secondary relay
Relay11 in device group relayS2；Judge whether sampled signal Inv is equal to sampled signal Load, if it is, determining
Relay11, which exists, glues dead failure.
Wherein, the present embodiment can detect one or more relays in relayM2 and relayS2 according to actual needs
Device switch, which whether there is, glues dead failure.When the relay switch for needing to detect in relayM2 and relayS2 is one, then drive
Dynamic circuit breaker opens the relay switch for needing to detect, and drives remaining relay switch in closure relayM2 and relayS2.
When the relay switch for needing to detect in relayM2 and relayS2 is multiple, then driven according to preset order disconnected
A relay switch is opened, and drives remaining relay switch in closure relayM2 and relayS2.Wherein, it presets suitable
Sequence can with but be not limited only to be the first relay switch in secondary relay group, the relay switch in rear main relay group；With/
Or, preset order can be with it is not limited to be the relay switch on first firewire L, the relay switch on rear zero curve N.Than
Such as, three relay switches in relayM2 and relayS2 are required to detect whether to exist to glue dead failure, can first detect
Relay11 (at this point, disconnecting Relay11, is closed Relay9 and Relay10), then successively detects Relay9 and Relay10).
The relay fault detection method of photovoltaic energy storage system provided in an embodiment of the present invention drives energy storage inverter and this
A relay switch between ground load system is in an off state, remaining relay switch is in closed state, by energy storage
Sampled signal Load between the sampled signal Inv of inverter inverter side and local load system and relayS1 is compared, energy
The relay switch between energy storage inverter and local load system is enough determined with the presence or absence of dead failure is glued, to ensure that photovoltaic stores up
The normal operation of energy system.
Second of implementation: control energy storage inverter inverter side exports the sine wave V1 of the second default amplitude, and control
All relay switches in relayM2 and relayS2 processed are in closed state；Judge whether sampled signal Inv is equal to sampling
Signal Load determines three relays in relayM2 and relayS2 when sampled signal Inv is not equal to sampled signal Load
Switch can not be closed at.
In the present embodiment, the sine wave V1 of inverter side output fixed amplitude, and driving main relay group are closed in driving
All relay switches in relayM2 and relayS2 are in closed state, i.e. Relay9, Relay10 and Relay11 locates
In closed state.Then judge whether sampled signal Inv is equal to sampled signal Load, if it is not, then determining three relays
Switch can not be closed at, for example, Relay9, Relay10 and Relay11 presence can not be closed at failure.
The relay fault detection method of photovoltaic energy storage system provided in an embodiment of the present invention drives energy storage inverter and this
All relay switches of ground load system are in closed state, by the sampled signal Inv of energy storage inverter inverter side and
Sampled signal Load between relayS1 and local load system is compared, and can determine that there are nothings for multiple relay switches
Method is closed at failure, to ensure the normal operation of photovoltaic energy storage system.
Further, in the above-described embodiments, the relay failure inspection of photovoltaic energy storage system provided in an embodiment of the present invention
Survey method, can also include: according between sampled signal Grid and network system and local load system relay switch it is disconnected
It opens or closed state, determines relay switch between network system and local load system with the presence or absence of gluing dead failure or multiple
Relay switch can not be closed at failure.
In the present embodiment, it can control in all relay switches between network system and local load system wherein
One relay switch is in an off state, remaining relay switch is in closed state, should according to sampled signal Grid judgement
The relay switch of disconnection, which whether there is, glues dead failure.
Specifically, according to the disconnection of relay switch between sampled signal Grid and network system and local load system or
Closed state determines that the relay switch between network system and local load system whether there is and glues dead failure or multiple relays
Device switch can not be closed at failure, may include at least one of following two implementation:
The first implementation: control energy storage inverter inverter side exports the sine wave V1 of the second default amplitude, and control
One of relay switch in relayM1 or relayS1 processed is in an off state, remaining relay switch is in closed form
State；Judge whether sampled signal Grid is equal to sampled signal Load, sampled signal Load be local load system and relayS1 it
Between sampled signal；Sampled signal Grid be equal to sampled signal Load when, determine relayM1 or relayS1 in disconnect after
Electric switch, which exists, glues dead failure.
In the present embodiment, driving inverter side exports the sine wave V1 of the second default amplitude, and the second default amplitude is 36V or so
Safe voltage；And any one relay switch between network system and local load system is in an off state, remaining
Relay switch is in closed state.Then judge whether sampled signal Grid is equal to sampled signal Load, if it is, explanation
The relay switch being in an off state, which exists, glues dead failure.
For example, determine that the Relay8 in relayS1 whether there is and glue dead failure.Specifically, driving inverter side output
The sine wave V1 of fixed amplitude, Relay5, Relay6 of driving closure main relay group relayM1 and secondary relay group
Relay7 in relayS1, driving disconnect the Relay8 in secondary relay group relayS1；Judge sampled signal Grid whether etc.
In sampled signal Load, if it is, determining that Relay8 exists glues dead failure.
Wherein, the present embodiment can detect one or more relays in relayM1 and relayS1 according to actual needs
Device switch, which whether there is, glues dead failure.When the relay switch for needing to detect in relayM1 and relayS1 is one, then drive
Dynamic circuit breaker opens the relay switch for needing to detect, and drives remaining relay switch in closure relayM1 and relayS1.
When the relay switch for needing to detect in relayM2 and relayS2 is multiple, then driven according to preset order disconnected
A relay switch is opened, and drives remaining relay switch in closure relayM2 and relayS2.Wherein, it presets suitable
Sequence can with but be not limited only to be the first relay switch in secondary relay group, the relay switch in rear main relay group；With/
Or, preset order can be with it is not limited to be the relay switch on first firewire L, the relay switch on rear zero curve N.Than
Such as, four relay switches in relayM1 and relayS1 are required to detect whether to exist to glue dead failure, can first detect
Relay8 (at this point, disconnect Relay8, be closed Relay5, Relay6 and Relay7, then successively detect Relay5, Relay6 and
Relay7)。
The relay fault detection method of photovoltaic energy storage system provided in an embodiment of the present invention drives network system and local
A relay switch between load system is in an off state, remaining relay switch is in closed state, by power grid system
The sampled signal Load between sampled signal Grid and local load system and relayS1 between system and relayS is compared
Compared with can determine the relay switch between network system and local load system with the presence or absence of dead failure is glued, to ensure light
Lie prostrate the normal operation of energy-storage system.
Second of implementation: control energy storage inverter inverter side exports the sine wave V1 of the second default amplitude, and control
All relay switches in relayM1 and relayS1 processed are in closed state；Judge whether sampled signal Grid is equal to sampling
Signal Load determines four relays in relayM1 and relayS1 when sampled signal Grid is not equal to sampled signal Load
Device switch can not be closed at.
In the present embodiment, the sine wave V1 of inverter side output fixed amplitude, and driving main relay group are closed in driving
All relay switches in relayM1 and relayS1 are in closed state, i.e. Relay5, Relay6, Relay7 and Relay8
It is in closed state.Then judge whether sampled signal Grid is equal to sampled signal Load, if it is not, then determine four after
Electric switch can not be closed at, for example, Relay5, Relay6, Relay7 and Relay8 presence can not be closed at event
Barrier.
The relay fault detection method of photovoltaic energy storage system provided in an embodiment of the present invention drives network system and local
All relay switches between load system are in closed state, by the sampled signal Grid between network system and relayS
Sampled signal Load between relayS1 and local load system is compared, and can determine that multiple relay switches exist
It can not be closed at failure, to ensure the normal operation of photovoltaic energy storage system.
Fig. 4 is the flow chart of the relay fault detection method of photovoltaic energy storage system provided by Embodiment 2 of the present invention, such as
Shown in Fig. 4, the relay fault detection method of photovoltaic energy storage system provided in an embodiment of the present invention may include:
S401: driving relay switch Relay1-Relay11.
The present embodiment disconnects all relay switches when carrying out relay test first.
S402: the sine wave V of driving energy storage inverter inverter side output fixed amplitude.
S403: judge whether sampled signal Inv=sine wave V.If so, executing S405；Otherwise, S404 is executed.
S404: there are failures for inverter bridge leg.
In the present embodiment, judge whether the sampled signal Inv of energy storage inverter inverter side is equal to energy storage inverter inverter side
The sine wave V of fixed amplitude is exported, there are failures if it is not, then illustrating the inverter bridge leg of energy storage inverter；If it is, into
Dead failure or multiple relay switches are glued in relay switch presence can not be closed at the detection of failure.
S405: sine wave V, driving closure Relay1, Relay2 and Relay4 are closed in driving.
S406 judges whether sampled signal Inv is equal to sampled signal Grid.If so, executing S407；Otherwise, it executes
S408。
S407:Relay3, which exists, glues dead failure.
S408: sine wave V is closed in driving, and driving closure Relay1, Relay2 and Relay3 disconnect Relay4.
S409: judge whether sampled signal Inv is equal to sampled signal Grid.If so, executing S410；Otherwise, it executes
S411。
S410:Relay4, which exists, glues dead failure.
S411: driving relay switch Relay1-Relay11.
In the present embodiment, when the relay switch in secondary relay group glues dead breakdown judge and finishes, driving is disconnected again
All relay switches in photovoltaic energy storage system are restored to original state by relay switch Relay1-Relay11.
S412: sine wave V, driving closure Relay3, Relay4 and Relay1 are closed in driving.
S413: judge whether sampled signal Inv is equal to sampled signal Grid.If so, executing S414；Otherwise, it executes
S415。
S414:Relay2, which exists, glues dead failure.
S415: sine wave V is closed in driving, and driving closure Relay3, Relay4 and Relay2 disconnect Relay1.
S416: judge whether sampled signal Inv is equal to sampled signal Grid.If so, executing S417；Otherwise, it executes
S418。
S417:Relay1, which exists, glues dead failure.
S418: sine wave V, driving closure Relay3, Relay4, Relay2 and Relay1 are closed in driving.
S419: judge whether sampled signal Inv is equal to sampled signal Grid.If so, executing S421；Otherwise, it executes
S420。
S420: four relay switches can not be closed at.
S421: driving relay switch Relay1-Relay11.
S422: driving output sine wave V1, driving closure Relay9 and Relay10.
Wherein, sine wave V1 fixed amplitude is the safe voltage of 36V or so.
S423: judge whether sampled signal Inv is equal to sampled signal Load.If so, executing S424；Otherwise, it executes
S425。
S424:Relay11, which exists, glues dead failure.
S425: sine wave V1 is closed in driving, and driving disconnects Relay9, Relay10 and Relay11.
S426: driving output sine wave V1, driving closure Relay11 and Relay10.
S427: judge whether sampled signal Inv is equal to sampled signal Load.If so, executing S428；Otherwise, it executes
S429。
S428:Relay9, which exists, glues dead failure.
S429: driving output sine wave V1, driving closure Relay11, Relay10 and Relay9.
S430: judge whether sampled signal Inv is equal to sampled signal Load.If so, executing S432；Otherwise, it executes
S431。
S431: three relay switches can not be closed at.
S432: driving output sine wave V1, driving closure Relay5, Relay6 and Relay7.
S433: judge whether sampled signal Grid is equal to sampled signal Load.If so, executing S434；Otherwise, it executes
S435。
S434:Relay8, which exists, glues dead failure.
S435: driving output sine wave V1, driving closure Relay5, Relay6 and Relay8 disconnect Relay7.
S436: judge whether sampled signal Grid is equal to sampled signal Load.If so, executing S437；Otherwise, it executes
S438。
S437:Relay7, which exists, glues dead failure.
S438: sine wave V1 is closed in driving, and driving disconnects Relay5, Relay6, Relay8 and Relay7.
S439: driving output sine wave V1, driving closure Relay7, Relay8 and Relay6.
S440: judge whether sampled signal Grid is equal to sampled signal Load.If so, executing S441；Otherwise, it executes
S442。
S441:Relay5, which exists, glues dead failure.
S442: driving output sine wave V1, driving closure Relay7, Relay8 and Relay5 disconnect Relay6.
S443: judge whether sampled signal Grid is equal to sampled signal Load.If so, executing S444；Otherwise, it executes
S445。
S444:Relay6, which exists, glues dead failure.
S445: sine wave V1 is closed in driving, and driving disconnects Relay7, Relay8, Relay5 and Relay6, driving closure
Relay3, Relay4, Relay2 and Relay1, driving disconnect Relay9, Relay10 and Relay11.
It will appreciated by the skilled person that whole or certain steps, system, dress in method disclosed hereinabove
Functional module/unit in setting may be implemented as software, firmware, hardware and its combination appropriate.In hardware embodiment,
Division between the functional module/unit referred in the above description not necessarily corresponds to the division of physical assemblies；For example, one
Physical assemblies can have multiple functions or a function or step and can be executed by several physical assemblies cooperations.Certain groups
Part or all components may be implemented as by processor, such as the software that digital signal processor or microprocessor execute, or by
It is embodied as hardware, or is implemented as integrated circuit, such as specific integrated circuit.Such software can be distributed in computer-readable
On medium, computer-readable medium may include computer storage medium (or non-transitory medium) and communication media (or temporarily
Property medium).As known to a person of ordinary skill in the art, term computer storage medium is included in for storing information (such as
Computer readable instructions, data structure, program module or other data) any method or technique in the volatibility implemented and non-
Volatibility, removable and nonremovable medium.Computer storage medium include but is not limited to RAM, ROM, EEPROM, flash memory or its
His memory technology, CD-ROM, digital versatile disc (DVD) or other optical disc storages, magnetic holder, tape, disk storage or other
Magnetic memory apparatus or any other medium that can be used for storing desired information and can be accessed by a computer.This
Outside, known to a person of ordinary skill in the art to be, communication media generally comprises computer readable instructions, data structure, program mould
Other data in the modulated data signal of block or such as carrier wave or other transmission mechanisms etc, and may include any information
Delivery media.
Claims (10)
1. a kind of relay fault detection method of photovoltaic energy storage system, the photovoltaic energy storage system include energy storage inverter, electricity
Net system and local load system, between the energy storage inverter and the network system, the network system and the local
It is connected to respectively by one group of transmission line between load system and between the energy storage inverter and the local load system,
Be in series with a main relay group on every group of transmission line, be respectively labeled as relayM, relayM1 and relayM2, each master after
Electric appliance group includes two relay switches, and two relay switches are respectively arranged on the zero curve and firewire of transmission line, feature
It is, which comprises
Control the sine wave V that the energy storage inverter inverter side exports the first default amplitude；
Acquire the sampled signal Inv between the energy storage inverter inverter side and relayM；
Detect the sampled signal Inv whether be the first default amplitude sine wave V；
When the sampled signal Inv is the sine wave V of the first default amplitude, according to sampled signal Inv and the energy storage inversion
State is opened or closed in relay switch between device and the network system, determines the energy storage inverter and the power grid system
Relay switch between system can not be closed at failure with the presence or absence of gluing dead failure or multiple relay switches.
2. the method according to claim 1, wherein described according to sampled signal Inv and the energy storage inverter
State is opened or closed in relay switch between the network system, determines the energy storage inverter and the network system
Between relay switch can not be closed at failure with the presence or absence of gluing dead failure or multiple relay switches, comprising:
Control the sine wave V that the energy storage inverter inverter side stops exporting the first default amplitude, and control relayM
In one of relay switch be in an off state, another relay switch is in closed state；
Judge whether sampled signal Inv is equal to sampled signal Grid0, the sampled signal Grid0 be the network system with
Sampled signal between relayM；
When sampled signal Inv is equal to sampled signal Grid0, determine that the relay switch disconnected in relayM has viscous dead event
Barrier.
3. according to the method described in claim 2, it is characterized in that, described according to sampled signal Inv and the energy storage inverter
State is opened or closed in relay switch between the network system, determines the energy storage inverter and the network system
Between relay switch can not be closed at failure with the presence or absence of gluing dead failure or multiple relay switches, further includes:
Control the sine wave V that the energy storage inverter inverter side stops exporting the first default amplitude, and control relayM
In all relay switches be in closed state；
Judge whether sampled signal Inv is equal to sampled signal Grid0, the sampled signal Grid0 be the network system with
Sampled signal between relayM；
When sampled signal Inv is not equal to sampled signal Grid0, determine that two relay switches in relayM can not close simultaneously
It closes.
4. the method according to claim 1, wherein being additionally provided with one and main relay group on every group of transmission line
Concatenated pair relay group, is respectively labeled as relayS, relayS1 and relayS2；RelayS and relayS1 respectively include two
A relay switch, two relay switches are respectively arranged on the zero curve and firewire of transmission line, and relayS2 includes one and is set to
Relay switch on transmission line zero curve；
It is described according to the disconnection of relay switch between sampled signal Inv and the energy storage inverter and the network system or to close
Conjunction state determines that the relay switch between the energy storage inverter and the network system whether there is and glues dead failure or multiple
Relay switch can not be closed at failure, comprising:
Control the sine wave V that the energy storage inverter inverter side stops exporting the first default amplitude, and control relayM
Or one of relay switch in relayS is in an off state, remaining relay switch is in closed state；
Judge whether sampled signal Inv is equal to sampled signal Grid, the sampled signal Grid be the network system with
Sampled signal between relayS；
When sampled signal Inv is equal to sampled signal Grid, determine that the relay switch disconnected in relayM or relayS exists
Glue dead failure.
5. according to the method described in claim 4, it is characterized in that, described according to sampled signal Inv and the energy storage inverter
State is opened or closed in relay switch between the network system, determines the energy storage inverter and the network system
Between relay switch can not be closed at failure with the presence or absence of gluing dead failure or multiple relay switches, further includes:
Control the sine wave V that the energy storage inverter inverter side stops exporting the first default amplitude, and control relayM
Closed state is in all relay switches in relayS；
Judge whether sampled signal Inv is equal to sampled signal Grid, the sampled signal Grid be the network system with
Sampled signal between relayS；
Sampled signal Inv be not equal to sampled signal Grid when, determine relayM and relayS in four relay switches without
Method is closed at.
6. method according to claim 4 or 5, which is characterized in that the method also includes:
According to the disconnection of relay switch between sampled signal Inv and the energy storage inverter and the local load system or close
Conjunction state, determine relay switch between the energy storage inverter and the local load system with the presence or absence of glue dead failure or
Multiple relay switches can not be closed at failure, comprising:
Control the sine wave V1 that the energy storage inverter inverter side exports the second default amplitude, and control relayM2 or
One of relay switch in relayS2 is in an off state, remaining relay switch is in closed state；Judgement sampling
Whether signal Inv is equal to sampled signal Load, and the sampled signal Load is between the local load system and relayS1
Sampled signal；When sampled signal Inv is equal to sampled signal Load, determine that the relay disconnected in relayM2 or relayS2 is opened
It closes to exist and glues dead failure；
Or, comprising:
Control the sine wave V1 that the energy storage inverter inverter side exports the second default amplitude, and control relayM2 and
All relay switches in relayS2 are in closed state；Judge whether sampled signal Inv is equal to sampled signal Load, In
When sampled signal Inv is not equal to sampled signal Load, determine that three relay switches in relayM2 and relayS2 can not be same
When be closed.
7. method according to claim 4 or 5, which is characterized in that the method also includes:
According to the disconnection of relay switch between sampled signal Grid and the network system and the local load system or close
Conjunction state determines that the relay switch between the network system and the local load system whether there is and glues dead failure or more
A relay switch can not be closed at failure, comprising:
Control the sine wave V1 that the energy storage inverter inverter side exports the second default amplitude, and control relayM1 or
One of relay switch in relayS1 is in an off state, remaining relay switch is in closed state；Judgement sampling
Whether signal Grid is equal to sampled signal Load, and the sampled signal Load is between the local load system and relayS1
Sampled signal；When sampled signal Grid is equal to sampled signal Load, the relay disconnected in relayM1 or relayS1 is determined
Device switch, which exists, glues dead failure；
Or, comprising:
Control the sine wave V that the energy storage inverter inverter side exports the second default amplitude, and control relayM1 and
All relay switches in relayS1 are in closed state；Judge whether sampled signal Grid is equal to sampled signal Load, In
When sampled signal Grid is not equal to sampled signal Load, determine that four relay switches in relayM1 and relayS1 can not be same
When be closed.
8. the method according to claim 1, wherein the method also includes:
When the sampled signal Inv is not the sine wave V of the first default amplitude, the inverter bridge leg of the energy storage inverter is determined
There are failures.
9. a kind of photovoltaic energy storage system characterized by comprising energy storage inverter, network system and local load system；
Between the energy storage inverter and the network system, between the network system and the local load system and institute
It states and is connected to respectively by one group of transmission line between energy storage inverter and the local load system, connected on every group of transmission line
There is a main relay group, be respectively labeled as relayM, relayM1 and relayM2, each main relay group includes two relays
Device switch, two relay switches are respectively arranged on the zero curve and firewire of transmission line；
The photovoltaic energy storage system further include: master control system, the master control system is for executing such as any one of claim 1-7 institute
The relay fault detection method for the photovoltaic energy storage system stated.
10. photovoltaic energy storage system according to claim 9, which is characterized in that be additionally provided on every group of transmission line one with
The concatenated secondary relay group of main relay group, is respectively labeled as relayS, relayS1 and relayS2；RelayS and relayS1
Two relay switches are respectively included, two relay switches are respectively arranged on the zero curve and firewire of transmission line, relayS2 packet
Include the relay switch being set on transmission line zero curve.
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| CN113533954B (en) * | 2021-07-26 | 2024-04-12 | 爱士惟新能源技术(扬中)有限公司 | Method and control system for detecting relay closing time of energy storage inverter |
| CN114300307A (en) * | 2021-11-30 | 2022-04-08 | 科华数据股份有限公司 | Sticking detection method for bypass relay unit in energy storage inverter and energy storage inverter |
| CN114300307B (en) * | 2021-11-30 | 2024-01-02 | 厦门科华数能科技有限公司 | Method for detecting sticking of bypass relay unit in energy storage inverter and energy storage inverter |
| 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 |
| CN115184838B (en) * | 2022-09-08 | 2023-01-31 | 深圳市云天数字能源有限公司 | Relay short circuit failure detection method and device |
| WO2024140218A1 (en) * | 2022-12-30 | 2024-07-04 | 杭州禾迈电力电子股份有限公司 | Relay fault detection method and apparatus for inverter system, and system |
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Application publication date: 20191105 |