CN114300307B - Method for detecting sticking of bypass relay unit in energy storage inverter and energy storage inverter - Google Patents
Method for detecting sticking of bypass relay unit in energy storage inverter and energy storage inverter Download PDFInfo
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- CN114300307B CN114300307B CN202111445253.6A CN202111445253A CN114300307B CN 114300307 B CN114300307 B CN 114300307B CN 202111445253 A CN202111445253 A CN 202111445253A CN 114300307 B CN114300307 B CN 114300307B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 36
- 238000005070 sampling Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 description 6
- 238000000926 separation method Methods 0.000 description 4
- 230000009466 transformation Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/14—Protecting elements, switches, relays or circuit breakers
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Abstract
The invention discloses a method for detecting the sticking of a bypass relay unit in an energy storage inverter and the energy storage inverter, wherein the method judges that the bypass relay unit is stuck when the energy storage inverter simultaneously meets the following conditions: condition one: the voltage of the grid-connected end and the off-grid end are in the same frequency and phase when the energy storage inverter operates in an off-grid mode; condition II: the voltage of the grid-connected terminal drops to a zero point or near the zero point in a preset detection period after the energy storage inverter operates in a grid-connected mode; compared with a conventional detection mode, the detection mode provided by the invention does not occupy the IO port of the bypass relay unit, and only needs to sample the voltages of the grid-connected end and the grid-off end in real time, so that the detection method can be carried out while the energy storage inverter switches the operation mode, and the convenience degree of detecting whether the bypass relay unit has a sticking fault or not is improved.
Description
Technical Field
The invention relates to the technical field of energy storage inverters, in particular to a method for detecting sticking of a bypass relay unit in an energy storage inverter and the energy storage inverter.
Background
The energy storage inverter has a plurality of working modes of grid connection, grid separation and bypass, and referring to fig. 1, the energy storage inverter has a grid connection port and a grid separation port, the grid connection port is connected with a power grid end, the grid separation port is connected with a load end, and a grid connection relay unit, a grid separation relay unit and a bypass relay unit are arranged in the energy storage inverter. In the grid-connected mode, the grid-connected relay unit, the off-grid relay unit and the bypass relay unit are all attracted, in the off-grid mode, the off-grid relay unit is attracted, other relay units are disconnected, and in the bypass mode, the bypass relay unit is attracted, and other relay units are disconnected. Failure of the relay unit may cause damage to the energy storage inverter, and thus it is necessary to detect whether the relay unit has a failure. One of the faults of the relay unit is a sticking fault, namely the relay unit keeps a suction state all the time and cannot be disconnected.
Disclosure of Invention
The invention aims to overcome the defects or problems in the prior art, and provides a sticking detection method of a bypass relay unit in an energy storage inverter, which can detect whether the bypass relay unit has a sticking fault or not and avoid damage of the energy storage inverter in the use process caused by the sticking of the bypass relay unit.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a method of detecting sticking of a bypass relay unit in an energy storage inverter having a grid-connected end and an off-grid end and configured to be adapted to switch operation in a grid-connected mode, an off-grid mode, or a bypass mode, the method comprising: detecting voltage parameters of the grid-connected end and the grid-disconnected end in real time, and judging that the bypass relay unit is stuck when the voltage parameters meet the following conditions; condition one: the grid-connected terminal voltage and the off-grid terminal voltage are the same in frequency and phase when the energy storage inverter operates in an off-grid mode; condition II: and the grid-connected terminal voltage drops to a zero point or near the zero point in a preset detection period after the energy storage inverter operates in a grid-connected mode.
Further, the detection period is 2ms to 10ms.
Further, before the energy storage inverter operates in the off-grid mode, the operating mode is one of a grid-connected mode, an off-grid mode or a bypass mode.
Further, the voltages of the grid-connected end and the off-grid end of the energy storage inverter are obtained through real-time sampling.
Further, the grid-connected terminal voltage parameter obtained in the detection period is a grid-connected terminal voltage effective value.
In addition, the invention also provides an energy storage inverter which comprises an inverter circuit, a grid-connected relay unit, an off-grid relay unit and a bypass relay unit, wherein the grid-connected relay unit is connected with a grid-connected end of the grid-connected relay unit, and the off-grid relay unit is connected with an off-grid end of the off-grid relay unit and further comprises a controller; the controller is configured to detect whether the bypass relay is stuck according to the method for detecting sticking of the bypass relay unit in the energy storage inverter according to any one of the above; the controller is connected with the grid-connected relay unit, the off-grid relay unit and the bypass relay unit of the energy storage inverter and used for controlling the opening and the closing of the grid-connected relay unit, the off-grid relay unit and the bypass relay unit, the controller is configured to be suitable for receiving voltage sampling information of the grid-connected end and the off-grid end, and the controller is also configured to be suitable for judging that the bypass relay unit is stuck when the energy storage inverter meets the following conditions; condition one: the grid-connected terminal voltage and the off-grid terminal voltage are the same in frequency and phase when the energy storage inverter operates in an off-grid mode; condition II: and the grid-connected terminal voltage drops to a zero point or near the zero point in a preset detection period after the energy storage inverter operates in a grid-connected mode.
Further, the detection period is 2ms to 10ms.
Further, before the energy storage inverter operates in the off-grid mode, the operating mode is one of a grid-connected mode, an off-grid mode or a bypass mode.
Further, the voltages of the grid-connected end and the off-grid end of the energy storage inverter are obtained through real-time sampling.
Further, the grid-connected terminal voltage parameter obtained in the detection period is a grid-connected terminal voltage effective value.
As can be seen from the above description of the present invention, the present invention has the following advantages over the prior art:
according to the method for detecting the sticking of the bypass relay unit in the energy storage inverter, provided by the invention, firstly, whether the bypass relay unit is in the attraction state or not is judged by judging whether the voltages of the grid-connected end and the grid-connected end of the energy storage inverter are in the same frequency and in phase when the energy storage inverter runs in the grid-off mode, if the voltages of the grid-connected end and the grid-off end of the energy storage inverter are in the same frequency and in phase, the bypass relay unit can be initially judged to be in the attraction state, but because the voltages of the inverse transformation circuit end of the energy storage inverter and the voltage of the grid end are in the same frequency and in the same phase under the condition of being not connected, the voltage of the grid-connected end of the energy storage inverter is detected when the energy storage inverter runs in the grid-connected mode, if the bypass relay unit is in the sticking state, the voltage of the grid-connected end of the energy storage inverter can drop to the zero point or near the zero point in an extremely short period because the inverter circuit can not supply current to the grid end, and therefore, whether the sticking fault of the bypass relay unit in the energy storage inverter can be judged through the process, compared with the conventional detection mode, and the detection mode can be carried out by switching the voltage of the grid-connected end of the energy storage inverter, and the switching mode can be greatly detected when the voltage of the energy storage inverter is switched, and the inverter can be simultaneously in the real-time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments below are briefly introduced, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art energy storage inverter;
fig. 2 is a schematic diagram of an embodiment of an energy storage inverter provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are preferred embodiments of the invention and should not be taken as excluding other embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without creative efforts, are within the protection scope of the present invention.
In the claims, specification and drawings of the present invention, the terms "comprising," having, "and variations thereof as used herein, are intended to be" including but not limited to.
The embodiment of the invention provides a method for detecting the sticking of a bypass relay unit in an energy storage inverter, and simultaneously provides the energy storage inverter which is used for realizing the method for detecting the sticking.
The structure of the energy storage inverter can refer to fig. 2, and the energy storage inverter comprises an inverter circuit, a grid-connected relay unit, a grid-off relay unit, a bypass relay unit and a controller, wherein a grid-connected port for being connected with a grid end and a grid-off port for being connected with a load end are simultaneously arranged, the inverter circuit is simultaneously connected with one end of the grid-connected relay unit and one end of the grid-off relay unit, the other end of the grid-connected relay unit is connected with the grid-connected port and one end of the bypass relay unit, the other end of the grid-off relay unit is connected with the other end of the grid-off port and the bypass relay unit, the controller is in communication connection with the grid-connected relay unit, the grid-off relay unit and the bypass relay unit, and can control the grid-connected relay unit, the grid-off relay unit and the bypass relay unit to be attracted or disconnected, and meanwhile, the inverter circuit is also connected with the grid-connected end and the grid-off end so as to sample voltage parameters of the grid-connected end and the grid-off end in real time.
The controller can control the energy storage inverter to operate in a grid-connected mode, an off-grid mode and a bypass mode by controlling the on-off of the grid-connected relay unit, the off-grid relay unit and the bypass relay unit. When the energy storage inverter operates in a grid-connected mode, the grid-connected relay unit, the off-grid relay unit and the bypass relay unit are all attracted, when the energy storage inverter operates in the off-grid mode, only the off-grid relay unit is attracted, and when the energy storage inverter operates in the bypass mode, only the bypass relay is attracted.
The switching of the operation modes is realized by the controller sending corresponding on-off instructions to each relay unit, so that the energy storage inverter runs in a grid-connected mode, an off-grid mode or a bypass mode, and particularly, when the controller sends control instructions corresponding to each operation mode to each relay unit, the energy storage inverter is considered to run in a corresponding mode. Because the bypass relay unit may have a sticking fault, the energy storage inverter may not operate in a real off-grid mode, so that the energy storage inverter operating in the off-grid mode refers to a state where the controller sends a disconnection instruction to the grid-connected relay unit and the bypass relay unit and sends an actuation instruction to the off-grid relay unit, and at this time, if the bypass relay unit can normally switch actuation or disconnection, the energy storage inverter may operate in the real off-grid mode, and if the bypass relay unit has the sticking fault, the energy storage inverter unit may not operate in the real off-grid mode.
As an embodiment, in the above-mentioned initial state of normal operation of the energy storage inverter in the grid-connected mode, it is necessary to detect whether there is a sticking failure in the bypass relay unit in the energy storage inverter, and the detection method specifically includes:
detecting voltage parameters of a grid-connected end and a grid-off end of the energy storage inverter in real time, and judging that the bypass relay unit is stuck when the voltage parameters meet the following conditions;
condition one: the voltage of the grid-connected end and the off-grid end are in the same frequency and phase when the energy storage inverter operates in an off-grid mode;
condition II: the grid-connected terminal voltage drops to zero or near zero in a preset detection period after the energy storage inverter operates in a grid-connected mode.
Specifically, taking an actual detection process as an example, the method may include the following steps:
step one: the controller sends a disconnection instruction to the grid-connected relay unit and the bypass relay unit, and sends an attraction instruction to the off-grid relay unit so that the energy storage inverter operates in an off-grid mode;
step two: in the off-grid mode, detecting voltage parameters of a grid-connected end and an off-grid end, judging whether the two are in the same frequency and the same phase by a controller, if not, judging that the bypass relay unit has no sticking fault, and if so, executing the subsequent steps;
step three: when the power grid is normal, the controller sends an actuation instruction to the grid-connected relay unit, the off-grid relay unit and the bypass relay unit;
step four: and detecting the voltage parameter of the grid-connected terminal in a preset detection period, judging whether the voltage of the grid-connected terminal drops to a zero point or near the zero point in the detection period by a controller, if so, judging that the bypass relay unit has a sticking fault, and if not, judging that the bypass relay unit has no sticking fault.
The detection period may be selected within 2ms to 10ms, and in this embodiment, 5ms is the detection period.
Before the controller sends a disconnection instruction to the grid-connected relay unit and the bypass relay unit, the controller can operate in a grid-connected mode, a grid-off mode or a bypass mode, in this embodiment, the adhesion detection process of the bypass relay is described by taking the operation of the energy-storage inverter in the grid-connected mode as an initial state, but in other embodiments, the adhesion detection of the bypass relay can also be performed by taking other operation modes as initial states.
The voltages of the grid-connected end and the grid-disconnected end of the energy storage inverter are obtained through real-time sampling and are transmitted to the controller in real time, so that the voltages of the grid-connected end and the grid-disconnected end are analyzed and judged through the controller.
And the grid-connected terminal voltage parameter obtained in the detection period is a grid-connected terminal voltage effective value.
Of course, the above detection step is only one implementation mode, and since the detection method can detect the voltage parameters of the grid-connected end and the grid-disconnected end of the energy storage inverter in real time, and meanwhile, judge whether the bypass relay unit is stuck or not by whether the corresponding conditions are met, the step of switching the operation modes is not included in the actual detection process, and the energy storage inverter can be detected in real time.
According to the method for detecting the sticking state of the bypass relay unit in the energy storage inverter and the corresponding energy storage inverter, firstly, whether the bypass relay unit is in the sticking state or not is judged by judging whether voltages of a grid-connected end and a grid-off end of the energy storage inverter are in the same frequency and in the same phase when in off-grid mode operation, if the voltages of the grid-connected end and the grid-off end of the energy storage inverter are in the same frequency and in the same phase, the bypass relay can be initially judged to be in the sticking state, but because the possibility that the voltages of an inverse transformation circuit end of the energy storage inverter and the voltages of the grid end are in the same frequency and in the same phase under the condition that the voltages of the inverse transformation circuit end of the energy storage inverter and the grid end are not connected is present, the energy storage inverter is switched to the mode operation after the step, the voltage of the energy storage inverter is detected at the moment, if the voltage of the grid-connected end cannot supply current to the grid end, and the voltage of the grid-connected end of the energy storage inverter drops to zero point or near the zero point within a very short period, and therefore, whether the bypass relay in the energy storage inverter is in the sticking state or not can be judged to be detected through the process, compared with the conventional method for detecting the voltage of the bypass relay unit in the state, and the fact that the voltage of the grid-connected end is switched to the opposite side is in the mode is required to be switched to the mode.
The foregoing description of the embodiments and description is presented to illustrate the scope of the invention, but is not to be construed as limiting the scope of the invention. Modifications, equivalents, and other improvements to the embodiments of the invention or portions of the features disclosed herein, as may occur to persons skilled in the art upon use of the invention or the teachings of the embodiments, are intended to be included within the scope of the invention, as may be desired by persons skilled in the art from a logical analysis, reasoning, or limited testing, in combination with the common general knowledge and/or knowledge of the prior art.
Claims (8)
1. A method of detecting sticking of a bypass relay unit in an energy storage inverter having a grid-connected end and an off-grid end and configured to be adapted to switch operation in a grid-connected mode, an off-grid mode, or a bypass mode, the method comprising: detecting voltage parameters of the grid-connected end and the grid-disconnected end in real time, and judging that the bypass relay unit is stuck when the voltage parameters meet the following conditions; condition one: the grid-connected terminal voltage and the off-grid terminal voltage are the same in frequency and phase when the energy storage inverter operates in an off-grid mode; condition II: the grid-connected terminal voltage drops to a zero point or near the zero point in a preset detection period after the energy storage inverter operates in a grid-connected mode;
the detection method specifically comprises the following steps:
step one: controlling the energy storage inverter to operate in an off-grid mode;
step two: in the off-grid mode, detecting voltages of a grid-connected end and an off-grid end, and judging whether the voltages are in the same frequency and phase by a controller; if the two are not in the same-frequency and same-phase state, judging that the bypass relay unit has no sticking fault; if the two are in the same-frequency and same-phase state, executing the third step;
step three: when the power grid is normal, the energy storage inverter is controlled to be switched from an off-grid mode to a grid-connected mode;
step four: detecting the effective value of the grid-connected terminal voltage in a preset detection period, and judging whether the grid-connected terminal voltage drops to or near a zero point in the detection period by a controller; if yes, judging that the bypass relay unit has a sticking fault; if not, judging that the bypass relay unit has no sticking fault.
2. The method for detecting sticking of a bypass relay unit in an energy storage inverter according to claim 1, wherein the detection period is 2ms to 10ms.
3. The method for detecting sticking of a bypass relay unit in an energy storage inverter according to claim 1, wherein the operation mode of the energy storage inverter is one of a grid-connected mode, an off-grid mode, or a bypass mode before the energy storage inverter is operated in the off-grid mode.
4. The method for detecting the sticking of a bypass relay unit in an energy storage inverter according to claim 1, wherein voltages of a grid-connected end and an off-grid end of the energy storage inverter are obtained through real-time sampling.
5. The energy storage inverter comprises an inverter circuit, a grid-connected relay unit, an off-grid relay unit and a bypass relay unit, wherein the grid-connected relay unit is connected with a grid-connected end of the grid-connected relay unit, and the off-grid relay unit is connected with an off-grid end of the off-grid relay unit; the controller is configured to detect whether the bypass relay is stuck according to a stuck detection method of the bypass relay unit in the energy storage inverter as defined in any one of claims 1 to 4;
the controller is connected with the grid-connected relay unit, the off-grid relay unit and the bypass relay unit of the energy storage inverter and used for controlling the opening and the closing of the grid-connected relay unit, the off-grid relay unit and the bypass relay unit, and is configured to be suitable for receiving voltage sampling information of the grid-connected end and the off-grid end, and the bypass relay unit is judged to be stuck when the energy storage inverter meets the following conditions; condition one: the grid-connected terminal voltage and the off-grid terminal voltage are the same in frequency and phase when the energy storage inverter operates in an off-grid mode; condition II: the grid-connected terminal voltage drops to a zero point or near the zero point in a preset detection period after the energy storage inverter operates in a grid-connected mode;
the controller controls the energy storage inverter to operate in an off-grid mode, detects voltages of a grid-connected end and an off-grid end, controls the energy storage inverter to switch from the off-grid mode to the grid-connected mode when the two voltages are in the same frequency and the same phase, detects an effective value of the voltage of the grid-connected end in a preset detection period, and judges that the bypass relay unit is stuck if the voltage of the grid-connected end drops to or near a zero point in the detection period.
6. An energy storage inverter as defined in claim 5, wherein said detection period is 2ms to 10ms.
7. An energy storage inverter as claimed in claim 5 wherein said energy storage inverter is operated in one of a grid-tie mode, an off-grid mode or a bypass mode prior to operation in the off-grid mode.
8. An energy storage inverter as claimed in claim 5, wherein the voltages at the grid-connected and off-grid terminals of the energy storage inverter are obtained by real-time sampling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111445253.6A CN114300307B (en) | 2021-11-30 | 2021-11-30 | Method for detecting sticking of bypass relay unit in energy storage inverter and energy storage inverter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111445253.6A CN114300307B (en) | 2021-11-30 | 2021-11-30 | Method for detecting sticking of bypass relay unit in energy storage inverter and energy storage inverter |
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| CN114300307B true CN114300307B (en) | 2024-01-02 |
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| CN114300307A (en) | 2022-04-08 |
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