CN117214690B - Relay adhesion detection method, electronic equipment and energy storage system - Google Patents
Relay adhesion detection method, electronic equipment and energy storage system Download PDFInfo
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Abstract
The embodiment of the invention discloses a relay adhesion detection method, electronic equipment and an energy storage system, wherein the method comprises the following steps: respectively obtaining three-phase power grid voltage, three-phase inversion output voltage, DC side insulation impedance voltage and half bus voltage; calculating the voltages at two ends of the corresponding alternating current relay according to the three-phase power grid voltage, the three-phase inversion output voltage, the direct current side insulation impedance voltage, the half bus voltage and the N-line voltage to ground of the power grid; judging whether the voltages at two ends of each three-phase alternating current relay are smaller than a preset second voltage threshold value or not; if the voltages at two ends of any three-phase alternating-current relay are smaller than the second voltage threshold, the alternating-current relay group is adhered; if the voltages at the two ends of each three-phase alternating current relay are not smaller than the second voltage threshold value, the alternating current relay group is normal. According to the embodiment of the invention, the corresponding alternating current inverter voltage is directly calculated by acquiring the known voltage, so that whether the relay is adhered or not is judged. The hardware cost and the electric energy loss can be reduced.
Description
Technical Field
The embodiment of the invention relates to the field of relay detection, in particular to a relay adhesion detection method, electronic equipment and an energy storage system.
Background
Three-level inversion topologies are often employed in three-phase energy storage inverters to improve conversion efficiency. The three-phase four-wire energy storage inverter formed by the three-level inversion topology supports single-phase current independent control, so that current compensation can be carried out on unbalanced loads at the user side, three-phase currents at the connection point between the system and the power grid are balanced, and the loss of the power grid is greatly reduced.
Grid connection of the grid-connected inverter needs to pass grid connection safety certification, and the inverter is required to have insulation resistance protection and single-point fault detection function of the output relay in the certification. In the prior art, an additional voltage sampling circuit is usually arranged to collect the voltages at two ends of the relay, namely the voltage between the alternating current output end of the inverter and the output end of the power grid, and then whether the relay is adhered is judged according to the voltages. However, this increases hardware costs on the one hand and power consumption on the other hand of the voltage sampling circuit.
Disclosure of Invention
In order to solve the technical problems, one technical scheme adopted by the embodiment of the invention is as follows: the utility model provides a relay adhesion detection method is applied to the three-phase four-wire grid-connected energy storage system including dc-to-ac converter, alternating current relay group and electric wire netting, includes: respectively obtaining three-phase power grid voltage, three-phase inversion output voltage, DC side insulation impedance voltage and half bus voltage; calculating the voltages at two ends of the corresponding alternating current relay according to the three-phase power grid voltage, the three-phase inversion output voltage, the direct current side insulation impedance voltage, the half bus voltage and the N-line voltage to ground of the power grid; judging whether the voltages at two ends of each three-phase alternating current relay are smaller than a preset second voltage threshold value or not; if the voltage at two ends of any three-phase alternating current relay is smaller than the second voltage threshold, determining that the alternating current relay group is stuck; and if the voltages at the two ends of each three-phase alternating current relay are not smaller than the second voltage threshold value, confirming that the alternating current relay group is normal.
In some embodiments, before the three-phase grid voltage, the three-phase inverter output voltage, the dc-side insulation resistance voltage, and the half-bus voltage are obtained, respectively, the method further comprises: judging whether the power grid voltage is higher than a preset first voltage threshold value or not; if not, controlling the inverter to stop working; if yes, the fifth relay is controlled to be closed, and the inverter is made to be in a three-phase four-wire system.
In some embodiments, before determining whether the grid voltage is above the preset first voltage threshold, the method further comprises: and controlling the AC relay group to be completely disconnected.
In some embodiments, the calculating the voltage across the respective ac relay from the three-phase grid voltage, the three-phase inverter output voltage, the dc side insulation resistance voltage, the half bus voltage, and the N-line-to-ground voltage of the grid includes: calculating the voltages at two ends of the A-phase alternating current relay according to the A-phase power grid voltage, the A-phase inversion output voltage, the DC side insulation impedance voltage, the half bus voltage and the N-line voltage to ground; calculating the voltage at two ends of a B-phase alternating current relay according to the B-phase power grid voltage, the B-phase inversion output voltage, the DC side insulation impedance voltage, the half bus voltage and the N-line voltage to ground; and calculating the voltages at two ends of the C-phase alternating current relay according to the C-phase power grid voltage, the C-phase inversion output voltage, the DC side insulation impedance voltage, the half bus voltage and the N-line voltage to ground.
In some embodiments, the voltage across the a-phase ac relay is calculated by:
V S1 =V A2 +V 4 -V 3 +V N-PE -V A1 wherein V is S1 For the voltage at two ends of the A-phase alternating current relay, V A2 For the A phase inversion output voltage, V 4 For the half bus voltage, V 3 For the DC side insulation resistance voltage, V N-PE For the N line to ground voltage, V A1 -providing said a-phase grid voltage;
the voltage at two ends of the B-phase alternating current relay is calculated by the following formula:
V S2 =V B2 +V 4 -V 3 +V N-PE -V B1 wherein V is S2 For the voltage at two ends of the B-phase alternating current relay, V B2 For the B phase inversion output voltage, V B1 -providing said B-phase grid voltage;
the voltage at two ends of the C-phase alternating current relay is calculated by the following formula:
V S3 =V C2 +V 4 -V 3 +V N-PE -V C1 wherein V is S3 For the voltage at two ends of the C-phase alternating current relay, V C2 For the C-phase inversion output voltage, V C1 And (5) the C-phase power grid voltage.
In some embodiments, the first voltage threshold is 0.8 times the rated voltage of the power grid.
In some embodiments, the second voltage threshold is 0.05 times the rated voltage of the power grid.
In order to solve the technical problems, another technical scheme adopted by the embodiment of the invention is as follows: there is provided an electronic device including: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the relay adhesion detection method as described above.
In order to solve the technical problems, another technical scheme adopted by the embodiment of the invention is as follows: there is provided a non-volatile computer storage medium storing computer executable instructions that are executed by one or more processors to cause the one or more processors to perform a relay adhesion detection method as described above.
In order to solve the technical problems, another technical scheme adopted by the embodiment of the invention is as follows: an energy storage system is provided, which comprises an insulation resistance detection circuit, an inverter, a fifth relay, an alternating current relay group, a power grid and the electronic equipment, wherein the insulation resistance detection circuit is used for providing a direct current side insulation resistance voltage; the inverter is respectively connected to an A phase, a B phase, a C phase and an N line of the power grid through the alternating current relay group; the fifth relay is connected between a bus midpoint of the inverter and an ac relay connected to the N line; the electronic device is used for executing the relay adhesion detection method.
The beneficial effects of the embodiment of the invention are as follows: in contrast to the prior art, the embodiment of the invention directly calculates the corresponding ac inverter voltage by acquiring the three-phase grid voltage, the three-phase inverter output voltage, the dc side insulation resistance voltage and the half bus voltage, thereby judging whether the relay is stuck. The hardware cost and the electric energy loss can be reduced.
Drawings
FIG. 1 is a schematic diagram of a three-phase four-wire energy storage system;
fig. 2 is a schematic flow chart of a relay adhesion detection method according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of another relay adhesion detection method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an energy storage system according to an embodiment of the present invention.
Detailed Description
In order to facilitate an understanding of the present application, the present application will be described in more detail below with reference to the accompanying drawings and specific examples. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "upper," "lower," "inner," "outer," "bottom," and the like as used in this specification are used in an orientation or positional relationship based on that shown in the drawings, merely to facilitate the description of the present application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application in this description is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not collide with each other.
The three-phase four-wire energy storage system is schematically shown in fig. 1, and includes an inverter 10, an ac relay set 20, a power grid 30, a fifth relay S5, a Y capacitor C1, and an X capacitor C2.
The ac relay group 20 includes an a-phase ac relay S1, a B-phase ac relay S2, a C-phase ac relay S3, and an N-line ac relay S4. The inverter 10 is connected to the a-phase, B-phase, C-phase and N-line of the electric grid 30 via the a-phase ac relay S1, B-phase ac relay S2, C-phase ac relay S3 and N-line ac relay S4, respectively.
The fifth relay S5 is provided between the N-line relay S4 and the inverter 10, and when the fifth relay S5 is turned off, the inverter 10 operates in a three-phase three-line mode; when the fifth relay S5 is closed, the inverter 10 operates in three-phase four-wire mode.
The Y capacitor C1 is used for filtering common mode disturbance; the X capacitor C2 is used for filtering out differential mode disturbance. And the capacitance of the X capacitor C2 is much larger than that of the Y capacitor C1.
The resistor R1 and the resistor R2 shown in the figure are part of an insulation resistance detection circuit, and the principle of the insulation resistance detection circuit is to calculate the insulation resistance to ground of the inverter by detecting the potential of the positive electrode and the negative electrode of the direct current bus to the ground PE. The resistance values of the resistor R1 and the resistor R2 are generally designed to be in the megaohm range, and therefore have a negligible effect on the insulation resistance of the inverter itself.
The insulation resistance detection circuit is not an important point of the embodiment of the present application, and in this embodiment, the insulation resistance detection circuit is only used to provide the dc side insulation resistance voltage, and the specific circuit is not described in detail in the present application.
Before the relay group is closed, whether the A-phase alternating current relay S1, the B-phase alternating current relay S2 and the C-phase alternating current relay S3 are adhered and short-circuited needs to be detected, and if any one of the A-phase alternating current relay S1, the B-phase alternating current relay S2 and the C-phase alternating current relay S3 is adhered, a fault stop should be reported. In general, an additional voltage sampling circuit is arranged to collect voltages at two ends of an alternating current relay to be detected, and whether the alternating current relay is adhered or not is judged by comparing the voltages with a preset voltage threshold. However, this increases hardware costs on the one hand and power consumption on the other hand of the voltage sampling circuit.
In order to solve the above problems, the embodiment of the present invention provides a method for detecting adhesion of a relay, a flow chart of which is shown in fig. 2, which specifically includes the following steps:
step S400: and respectively acquiring three-phase grid voltage, three-phase inversion output voltage, DC side insulation impedance voltage and half bus voltage.
Specifically, the three-phase grid voltages include an a-phase grid voltage (i.e., a-phase ac relay grid-side potential), a B-phase grid voltage (i.e., B-phase ac relay grid-side potential), and a C-phase grid voltage (i.e., C-phase ac relay grid-side potential), the three-phase grid voltages being used to identify a current grid voltage, the current grid voltage being obtainable from the three-phase grid voltages; the three-phase inversion output voltage comprises an A-phase inversion output voltage (namely, an A-phase alternating current relay inverter side potential), a B-phase inversion output voltage (namely, a B-phase alternating current relay inverter side potential) and a C-phase inversion output voltage (namely, a C-phase alternating current relay inverter side potential), and the three-phase inversion output voltage is used for controlling the inverter output; the DC side insulation resistance voltage (namely, the voltage between the connection point of the resistor R1 and the resistor R2 and the negative electrode of the DC bus) is provided by an insulation resistance detection circuit and is used for detecting the magnitude of the DC side insulation resistance; the half bus voltage (i.e., the voltage between the midpoint of the dc bus and the negative electrode of the dc bus) is provided by the dc bus of the inverter for controlling the operation of the inverter.
Step S500: and calculating the voltages at two ends of the corresponding three-phase alternating current relay according to the three-phase power grid voltage, the three-phase inversion output voltage, the direct-current side insulation impedance voltage, the half bus voltage and the N-line voltage to ground of the power grid.
Specifically, the voltage at two ends of the A-phase alternating current relay is calculated according to the A-phase power grid voltage, the A-phase inversion output voltage, the direct-current side insulation resistance voltage, the half bus voltage and the N-line voltage to ground.
In the embodiment of the application, the voltage across the a-phase ac relay is calculated by the following formula:
V S1 =V A2 +V 4 -V 3 +V N-PE -V A1 ， （1）
wherein V is S1 Is the voltage of two ends of A phase AC relay, V A2 For A phase inversion output voltage, V 4 Is half bus voltage, V 3 Is the DC side insulation resistance voltage, V N-PE Is the voltage of N line to ground, V A1 Is the phase a grid voltage.
And calculating the voltages at two ends of the B-phase alternating current relay according to the B-phase power grid voltage, the B-phase inversion output voltage, the direct-current side insulation resistance voltage, the half bus voltage and the N-line voltage to ground.
In the embodiment of the application, the voltage across the B-phase ac relay is calculated by the following formula:
V S2 =V B2 +V 4 -V 3 +V N-PE -V B1 ， （2）
wherein V is S2 Voltage at two ends of B-phase AC relay, V B2 For B-phase inversion of output voltage, V B1 Is the B-phase grid voltage.
Calculating the voltage at two ends of the C-phase alternating current relay according to the C-phase power grid voltage, the C-phase inversion output voltage, the DC side insulation resistance voltage, the half bus voltage and the N-line voltage to ground
In the embodiment of the application, the voltage across the C-phase ac relay is calculated by the following formula:
V S3 =V C2 +V 4 -V 3 +V N-PE -V C1 ， （3）
wherein V is S3 Is the voltage at two ends of the C-phase alternating current relay, V C2 For C-phase inversion of output voltage, V C1 Is the C-phase grid voltage.
The N-line voltage to ground V N-PE I.e. the potential difference from the neutral line of the power grid to the ground, which is not more than 5V under normal working conditions and can be ignored, the voltage V of the N line to the ground in the voltage of the two ends of the three-phase alternating current relay is calculated N-PE Equivalent to 0V.
Taking an A-phase alternating current inverter as an example, an A-phase inversion output voltage V A2 For the voltage between points B and C in FIG. 1, the A-phase grid voltage V A1 The voltage between the A point and the N point is the insulation resistance voltage V on the direct current side 3 Half bus voltage V is the voltage between points D and E 4 The voltage between the point F and the point E is the voltage V of the N line of the power grid to the ground N-PE Is the voltage between point N and point D.
Voltage V at two ends of a-phase ac relay S1 The voltage between the point B and the point C is represented by the formula (1),
V A2 +V 4 -V 3 +V N-PE -V A1
=（V B -V C ）+（V F -V E ）-（V D -V E ）+（V N -V D ）-（V A -V N ）
= V B - V C + V F - V D + V N - V D - V A + V N （4）
the potential of C is equal to that of the point F, and the voltage V of the N line to the ground N-PE Negligible, so equation (4) can be simplified to:
V A2 +V 4 -V 3 +V N-PE -V A1
= V B - V A
thus, the formula (1) can be obtained.
Step S600: and judging whether the voltage at two ends of each three-phase alternating current relay is smaller than a preset second voltage threshold value.
In the embodiment of the present application, whether the voltages at two ends of the a-phase ac relay, the B-phase ac relay, and the C-phase ac relay are smaller than a preset second voltage threshold is determined, and if any three-phase ac relay has a voltage at two ends smaller than the second voltage threshold, step S710 is executed; if the voltages at the two ends of each three-phase ac relay are not less than the second voltage threshold, step S720 is performed.
In some embodiments of the present application, the second voltage threshold is 0.05 times the rated voltage of the power grid, and the value range is 0-1 times the power grid voltage. It should be noted that the second voltage threshold value should be taken into consideration for the voltage V of the N line to the ground N-PE So that the N line voltage to ground V N-PE The minimum value of (2) cannot be 0V.
Step S710: the ac relay group is stuck.
Step S720: the ac relay group is normal.
According to the embodiment of the invention, the corresponding alternating current inverter voltage is directly calculated by acquiring the three-phase power grid voltage, the three-phase inversion output voltage, the direct current side insulation impedance voltage and the half bus voltage, so that whether the relay is adhered or not is judged. The hardware cost and the electric energy loss can be reduced.
In other embodiments of the present application, another relay adhesion detection method is provided, and a flow chart of the relay adhesion detection method is shown in fig. 3, and specifically includes the following steps:
step S100: and controlling the three-phase alternating current relay and the N-line alternating current relay in the alternating current relay group to be completely disconnected.
Before relay adhesion detection, all three-phase alternating current relays and N-line alternating current relays in the alternating current relay group are disconnected. Under the condition that the three-phase alternating current relay is not adhered, the voltage of the inverter side of the three-phase alternating current relay is 0V, the voltage of the power grid side is 220V, and the pressure difference between two ends of the three-phase alternating current relay is large. If the three-phase alternating current relay is stuck, the pressure difference between two ends is reduced.
Step S200: and judging whether the power grid voltage is higher than a preset first voltage threshold value.
Specifically, whether the power grid voltage is higher than a preset first voltage threshold is determined, if yes, step S310 is executed; if not, step S320 is performed.
In the embodiment of the application, the first voltage threshold is 0.8 times of the rated voltage of the power grid.
Step S310: and controlling the fifth relay to be closed, so that the inverter is in a three-phase four-wire system.
Step S320: control the inverter to stop working
Step S400: and respectively acquiring three-phase grid voltage, three-phase inversion output voltage, DC side insulation impedance voltage and half bus voltage.
Specifically, the three-phase grid voltages include an a-phase grid voltage (i.e., a-phase ac relay grid-side potential), a B-phase grid voltage (i.e., B-phase ac relay grid-side potential), and a C-phase grid voltage (i.e., C-phase ac relay grid-side potential), the three-phase grid voltages being used to identify a current grid voltage, the current grid voltage being obtainable from the three-phase grid voltages; the three-phase inversion output voltage comprises an A-phase inversion output voltage (namely, an A-phase alternating current relay inverter side potential), a B-phase inversion output voltage (namely, a B-phase alternating current relay inverter side potential) and a C-phase inversion output voltage (namely, a C-phase alternating current relay inverter side potential), and the three-phase inversion output voltage is used for controlling the inverter output; the DC side insulation resistance voltage (namely, the voltage between the connection point of the resistor R1 and the resistor R2 and the negative electrode of the DC bus) is provided by an insulation resistance detection circuit and is used for detecting the magnitude of the DC side insulation resistance; the half bus voltage (i.e., the voltage between the midpoint of the dc bus and the negative electrode of the dc bus) is provided by the dc bus of the inverter for controlling the operation of the inverter.
Step S500: and calculating the voltages at two ends of the corresponding three-phase alternating current relay according to the three-phase power grid voltage, the three-phase inversion output voltage, the direct-current side insulation impedance voltage, the half bus voltage and the N-line voltage to ground of the power grid.
Specifically, the voltage at two ends of the A-phase alternating current relay is calculated according to the A-phase power grid voltage, the A-phase inversion output voltage, the direct-current side insulation resistance voltage, the half bus voltage and the N-line voltage to ground.
In the embodiment of the application, the voltage across the a-phase ac relay is calculated by the following formula:
V S1 =V A2 +V 4 -V 3 +V N-PE -V A1 ，
wherein V is S1 Is the voltage of two ends of A phase AC relay, V A2 For A phase inversion output voltage, V 4 Is half bus voltage, V 3 Is the DC side insulation resistance voltage, V N-PE Is the voltage of N line to ground, V A1 Is the phase a grid voltage.
And calculating the voltages at two ends of the B-phase alternating current relay according to the B-phase power grid voltage, the B-phase inversion output voltage, the direct-current side insulation resistance voltage, the half bus voltage and the N-line voltage to ground.
In the embodiment of the application, the voltage across the B-phase ac relay is calculated by the following formula:
V S2 =V B2 +V 4 -V 3 +V N-PE -V B1 ，
wherein V is S2 Voltage at two ends of B-phase AC relay, V B2 For B-phase inversion of output voltage, V B1 Is the B-phase grid voltage.
Calculating the voltage at two ends of the C-phase alternating current relay according to the C-phase power grid voltage, the C-phase inversion output voltage, the DC side insulation resistance voltage, the half bus voltage and the N-line voltage to ground
In the embodiment of the application, the voltage across the C-phase ac relay is calculated by the following formula:
V S3 =V C2 +V 4 -V 3 +V N-PE -V C1 ，
wherein V is S3 Is the voltage at two ends of the C-phase alternating current relay, V C2 For C-phase inversion of output voltage, V C1 Is the C-phase grid voltage.
The N-line voltage to ground V N-PE I.e. the potential difference from the neutral line of the power grid to the ground, which is not more than 5V under normal working conditions and can be ignored, the voltage V of the N line to the ground in the voltage of the two ends of the three-phase alternating current relay is calculated N-PE Equivalent to 0V.
Step S600: and judging whether the voltage at two ends of each three-phase alternating current relay is smaller than a preset second voltage threshold value.
In the embodiment of the present application, whether the voltages at two ends of the a-phase ac relay, the B-phase ac relay, and the C-phase ac relay are smaller than a preset second voltage threshold is determined, and if any three-phase ac relay has a voltage at two ends smaller than the second voltage threshold, step S710 is executed; if the voltages at the two ends of each three-phase ac relay are not less than the second voltage threshold, step S720 is performed.
In some embodiments of the present application, the second voltage threshold is 0.05 times the rated voltage of the power grid, and the value range is 0-1 times the power grid voltage. It should be noted that the second voltage threshold value should be taken into consideration for the voltage V of the N line to the ground N-PE So that the N line voltage to ground V N-PE The minimum value of (2) cannot be 0V.
Step S710: the ac relay group is stuck.
Step S720: the ac relay group is normal.
According to the embodiment of the invention, the corresponding alternating current inverter voltage is directly calculated by acquiring the three-phase power grid voltage, the three-phase inversion output voltage, the direct current side insulation impedance voltage and the half bus voltage, so that whether the relay is adhered or not is judged. The hardware cost and the electric energy loss can be reduced.
The embodiment of the invention also provides an electronic device based on the relay adhesion detection method, a schematic structural diagram of which is shown in fig. 4, and the electronic device 60 includes:
one or more processors 601, a network interface 602, and a memory 603, one processor 601, one network interface 602, and one memory 603 being illustrated in fig. 4.
The network interface 602 is communicatively coupled to the corresponding processor 601, and the processor 601 and memory 602 may be coupled via a bus or otherwise, as illustrated in fig. 4.
The network interface 602 is used to establish a communication connection between the processor 601 and other external devices, and includes the following types: RJ-45 interface, SC fiber interface, AUI interface, FDDI interface, console interface, etc.
The memory 603 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The processor 601 executes various functional applications of the electronic device and data processing, namely, implements the relay adhesion detection method of the above-described method embodiment by running nonvolatile software programs, instructions, and units stored in the memory 603.
The memory 603 may include a storage program area that may store an operating system, at least one application program required for functions, and a storage data area; the storage data area may store data created from electronic device usage, and the like. In addition, memory 603 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, memory 603 optionally includes memory remotely located relative to processor 601, which may be connected to the electronic device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more units are stored in the memory 603 and when executed by the one or more processors 601 perform the relay adhesion detection method in any of the method embodiments described above, for example, perform the method steps S100 to S720 in fig. 3 described above.
The electronic equipment can execute the relay adhesion detection method provided by the embodiment of the invention, and has the corresponding program modules and beneficial effects of the execution method. Technical details which are not described in detail in the embodiment of the electronic device can be seen in the relay adhesion detection method provided by the embodiment of the invention.
Embodiments of the present invention also provide a nonvolatile computer-readable storage medium that may be contained in the apparatus described in the above embodiments; or may be present alone without being fitted into the device. The above-described nonvolatile computer-readable storage medium carries one or more programs that, when executed, implement the relay adhesion detection method of the embodiments of the present disclosure.
Based on the electronic device provided in the foregoing embodiment, the embodiment of the present invention provides an energy storage system, whose schematic structural diagram is shown in fig. 5, and the energy storage system includes an insulation resistance detection circuit 40, an inverter 10, a fifth relay 50, an ac relay group 20, a power grid 30, and the electronic device 60 as described above.
The insulation impedance detection circuit 40 is connected to the inverter 10 and the electronic device 60, respectively, and the insulation impedance detection circuit 40 is used for detecting the insulation impedance to ground of the inverter 10 and providing the insulation impedance voltage on the dc side to the electronic device 60.
The inverter 10 is connected to the a, B, C and N phases of the electric network 30 through the ac relay group 20, respectively; the fifth relay 50 is connected between the midpoint of the bus of the inverter 10 and the ac relay connected to the N line; the electronic device 60 is connected to the inverter 10, the ac relay group 20, and the second relay 50, respectively, for performing the relay sticking detection method as described in the above embodiment.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; the technical features of the above embodiments or in the different embodiments may also be combined under the idea of the present application, the steps may be implemented in any order, and there are many other variations of the different aspects of the present application as above, which are not provided in details for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (8)
1. The relay adhesion detection method is applied to a three-phase four-wire grid-connected energy storage system comprising an inverter, an alternating-current relay group and a power grid, and is characterized by comprising the following steps of:
respectively obtaining three-phase power grid voltage, three-phase inversion output voltage, DC side insulation impedance voltage and half bus voltage;
calculating the voltage at two ends of the corresponding three-phase alternating current relay according to the three-phase power grid voltage, the three-phase inversion output voltage, the direct current side insulation impedance voltage, the half bus voltage and the N-line voltage to ground of the power grid, wherein the method comprises the following steps:
calculating the voltage at two ends of the A-phase alternating current relay according to the A-phase power grid voltage, the A-phase inversion output voltage, the DC side insulation impedance voltage, the half bus voltage and the N-line voltage to ground;
calculating the voltage at two ends of a B-phase alternating current relay according to the B-phase power grid voltage, the B-phase inversion output voltage, the DC side insulation impedance voltage, the half bus voltage and the N-line voltage to ground;
calculating the voltages at two ends of a C-phase alternating current relay according to the C-phase power grid voltage, the C-phase inversion output voltage, the DC side insulation impedance voltage, the half bus voltage and the N-line voltage to ground;
the voltage at two ends of the A-phase alternating current relay is calculated by the following formula:
V S1 =V A2 +V 4 -V 3 +V N-PE -V A1 ，
wherein V is S1 For the voltage at two ends of the A-phase alternating current relay, V A2 For the A phase inversion output voltage, V 4 For the half bus voltage, V 3 For the DC side insulation resistance voltage, V N-PE For the N line to ground voltage, V A1 -providing said a-phase grid voltage;
the voltage at two ends of the B-phase alternating current relay is calculated by the following formula:
V S2 =V B2 +V 4 -V 3 +V N-PE -V B1 ，
wherein V is S2 For the voltage at two ends of the B-phase alternating current relay, V B2 For the B phase inversion output voltage, V B1 -providing said B-phase grid voltage;
the voltage at two ends of the C-phase alternating current relay is calculated by the following formula:
V S3 =V C2 +V 4 -V 3 +V N-PE -V C1 ，
wherein V is S3 For the voltage at two ends of the C-phase alternating current relay, V C2 For the C-phase inversion output voltage, V C1 -providing said C-phase grid voltage;
judging whether the voltage at two ends of the three-phase alternating current relay is smaller than a preset second voltage threshold value or not;
if the voltage at two ends of any three-phase alternating current relay is smaller than the second voltage threshold, the alternating current relay group is adhered;
and if the voltages at the two ends of each three-phase alternating current relay are not smaller than the second voltage threshold value, the alternating current relay group is normal.
2. The method of claim 1, wherein the three-phase four-wire grid-connected energy storage system further comprises a fifth relay, and wherein prior to separately deriving the three-phase grid voltage, the three-phase inverted output voltage, the dc-side insulation resistance voltage, and the half-bus voltage, the method further comprises:
judging whether the power grid voltage is higher than a preset first voltage threshold value or not;
if not, controlling the inverter to stop working;
if yes, the fifth relay is controlled to be closed, and the inverter is made to be in a three-phase four-wire system.
3. The method of claim 2, wherein prior to determining whether the grid voltage is above a preset first voltage threshold, the method further comprises:
and controlling the three-phase alternating current relay and the N-line alternating current relay in the alternating current relay group to be completely disconnected.
4. The method of claim 2, wherein the first voltage threshold is 0.8 times a rated voltage of the power grid.
5. The method of any of claims 1-4, wherein the second voltage threshold is 0.05 times the rated voltage of the power grid.
6. An electronic device, comprising:
at least one processor;
at least one network interface communicatively coupled to the respective processor; the method comprises the steps of,
a memory communicatively coupled to the at least one processor; wherein,
the network interface is used for establishing communication connection between the processor and other external devices;
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform a relay adhesion detection method according to any one of claims 1-5.
7. A non-transitory computer storage medium storing computer executable instructions which are executable by one or more processors to cause the one or more processors to perform the relay adhesion detection method of any one of claims 1 to 5.
8. An energy storage system comprising an insulation resistance detection circuit, an inverter, a fifth relay, an ac relay set, a power grid, and an electronic device according to claim 6,
the insulation impedance detection circuit is used for providing insulation impedance voltage at the direct current side;
the inverter is respectively connected to an A phase, a B phase, a C phase and an N line of the power grid through the alternating current relay group;
the fifth relay is connected between a bus midpoint of the inverter and an ac relay connected to the N line;
the electronic device is configured to execute the relay adhesion detection method according to any one of claims 1 to 5.
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