A grid-connected cabinet with intelligent monitoring function

Abstract

The present invention discloses a grid-connected cabinet with intelligent monitoring function, including primary circuit components, a multifunctional intelligent instrument monitoring part, a photovoltaic meter CF metering circuit, a status indication part and a data acquisition analysis and visualization display part, wherein the primary circuit components include an incoming circuit breaker (QF1-1-4), a surge circuit breaker (QFS), a surge protector (SPD), an anti-islanding device (QF1), an isolating switch (GS) and a connecting copper busbar and a busbar, and the multifunctional intelligent instrument monitoring part includes a current transformer (TC, TB, TA), a multifunctional meter (MPU), a fuse (Fua, Fub, Fuc, Fu1) and a connecting line. The present invention is provided with primary circuit components, a multifunctional intelligent instrument monitoring part, a photovoltaic meter CF metering circuit, a status indication part and a data acquisition analysis and visualization display part, which can enable the grid-connected cabinet to have the ability of intelligent monitoring, thereby effectively improving its use effect.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and in particular to a grid-connected cabinet with an intelligent monitoring function. Background Art

[0002] Electricity is an energy source that uses electrical energy as a driving force. It was invented in the 1870s. The invention and application of electricity set off the second climax of industrialization and became one of the three scientific and technological revolutions that have occurred in the world since the 18th century in human history. Since then, technology has changed people's lives. The large-scale power system that appeared in the 20th century is one of the most important achievements in the history of human engineering science. With the increasing popularity of distributed photovoltaic power stations, grid-connected cabinets are needed in photovoltaic power generation systems, but the existing grid-connected cabinets do not have the ability of intelligent monitoring, which reduces their use effect. For this reason, we propose a grid-connected cabinet with intelligent monitoring function. Summary of the invention

[0003] The purpose of the present invention is to provide a grid-connected cabinet with intelligent monitoring function to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a grid-connected cabinet with intelligent monitoring function, including primary circuit components, a multifunctional intelligent instrument monitoring part, a photovoltaic meter CF metering circuit, a status indication part and a data acquisition analysis and visualization display part, wherein the primary circuit components include an incoming circuit breaker (QF1-1-4), a surge circuit breaker (QFS), a surge protector (SPD), an anti-islanding device (QF1), an isolating switch (GS) and a connecting copper busbar and a busbar, and the multifunctional intelligent instrument monitoring part includes a current transformer (TC, TB, TA), a multifunctional instrument The photovoltaic meter CF metering circuit includes metering current transformers (TC, TB, TA), fuses (Fua, Fub, Fuc), terminal block (J1) and connecting wires. The status indication part includes indicator lights (H1x3, H2x3), fuses (FU1x3, HU1x3), manual emergency trip button (SB), intermediate relays (KA1, KA2) and connecting wires. The data acquisition, analysis and visualization display part includes an intelligent touch screen (HM1), a centralized communicator (CH1) and connecting wires.

[0005] Preferably, the incoming end of the incoming circuit breaker (QF1-1-4) is connected to the busbar through a connecting copper busbar, and a connecting copper busbar is led out from the busbar and connected to the outgoing end of the island device (QF1). At the same time, a connecting copper busbar is led out from the busbar and connected to the surge circuit breaker (QFS), and the surge circuit breaker (QFS) is connected to the surge protector (SPD) through the connecting busbar, the grounding terminal of the surge protector (SPD) is connected to the grounding protection busbar, the incoming end of the island device (QF1) is connected to the outgoing end of the disconnector (GS) through the connecting busbar, and the incoming end of the disconnector (GS) is connected to the connecting busbar for grid-connected cable connection.

[0006] Preferably, the current transformer (TC, TB, TA) is mounted on the upper end connection busbar of the island device (QF1), and after the secondary connection terminals of the current transformer (TC, TB, TA) are connected by a connecting wire, a connecting wire is led out and connected to the grounding protection busbar, and after the Ia, Ib, and Ic terminals of the multi-function instrument (MPU) are connected by a connecting wire, a connecting wire is led out and connected to the grounding protection busbar, and three connecting wires are led out from the primary of the current transformer (TC, TB, TA) and connected to the Ia, Ib, and Ic terminals of the multi-function instrument (MPU) respectively, and the busbar ( Lead out the connecting wire from the busbar A to the inlet of the fuse (Fu1), lead out the connecting wire from the outlet of the fuse (Fu1) to the L terminal of the multi-function instrument (MPU), lead out the connecting wire from the busbar N to the N terminal of the multi-function instrument (MPU), lead out the connecting wire from the AB terminal of the multi-function instrument (MPU) to the COM2 port of the touch screen.

[0007] Preferably, the current transformer (Ta, Tb, Tc) is mounted on the upper end connecting busbar of the disconnector (GS), and after the secondary terminals of the current transformer (Ta, Tb, Tc) are connected by connecting wires, a connecting wire is led out and connected to the grounding protection busbar, and a connecting wire is led out from the Ia', Ib', and Ic' terminals of the terminal block (J1) after being connected by connecting wires, and connected to the grounding protection busbar, three connecting wires are led out from the primary of the current transformer (Ta, Tb, Tc) and connected to the Ia, Ib, and Ic terminals of the terminal block (J1), a connecting wire is led out from the upper end connecting busbar (A / B / C) of the disconnector (GS) and connected to the incoming line terminal of the fuse (Fua, Fub, Fuc), and a connecting wire is led out from the outgoing line terminal of the fuse (Fua, Fub, Fuc) and connected to the Ua, Ub, and Uc terminals of the terminal block (J1).

[0008] Preferably, the connecting wire is led out from the lower end of the island device (QF1) connected to the busbar (L1 / L2 / L3), connected to the incoming line end of the fuse (FU1x3), the connecting wire is led out from the outgoing line end of the fuse (FU1x3), connected to the incoming line end of the photovoltaic side power indicator (H1x3), the connecting wire is led out from the outgoing line end of the photovoltaic side power indicator (H1x3) and connected to the connecting busbar N, the connecting wire is led out from the upper end of the island device (QF1) connected to the busbar (A / B / C), connected to the incoming line end of the fuse (FU2x3), and the connecting wire is led out from the outgoing line end of the fuse (FU2x3). 3) Lead out the connecting wire from the outgoing terminal and connect it to the incoming terminal of the power-on indicator light (H2x3) on the grid side. Lead out the connecting wire from the outgoing terminal of the power-on indicator light (H1x3) on the grid side and connect it to the busbar N. Lead out the connecting wire from the incoming terminal of the normally open contact of the manual emergency trip button (SB) and connect it to the terminal 3 of the island device (QF1). Lead out the connecting wire from the incoming terminal of the normally open contact of the manual emergency trip button (SB) and connect it to the terminal 4 of the island device (QF1). Lead out the connecting wires from all the terminals of the intermediate relay (KA1, KA2) and connect them to the reserved terminals.

[0009] Preferably, two communication lines are led out through the COM1 communication terminal of the smart touch screen (HM1) and connected to the communication concentrator (CH1), two communication lines are led out from the COM2 communication terminal of the smart touch screen (HM1) and connected to the communication terminals A and B of the anti-islanding device (QF1) and the multi-function instrument (MPU), and two connecting lines are led out from the DI1 terminal of the multi-function instrument (MPU) and connected to the remote signal output terminal of the surge protector (SPD).

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] The present invention is provided with a primary circuit component, which can complete the collection of power generation current and energy and form a current channel. Under the control of the above components, automatic grid connection is completed. A multifunctional intelligent instrument monitoring part is provided. The primary circuit current signal is collected through current transformers (TC, TB, TA). The primary circuit voltage signal is collected through fuses (Fua, Fub, Fuc) and connected to a multifunctional instrument (MPU), and short-circuit protection is provided. The fuse (Fu1) is connected to provide working power to the multifunctional instrument (MPU) and short-circuit protection is provided. The touch screen COM2 port reads the monitoring parameters of the multifunctional instrument through the connection of the communication port of the multifunctional instrument (MPU). A photovoltaic meter CF metering circuit is provided. The primary circuit current signal is collected through current transformers (Ta, Tb, Tc). The primary circuit voltage signal is collected through fuses (Fua, Fub, Fuc) for measurement of photovoltaic meters of power companies. A status indication part is provided, which is respectively indicated by indicator lights (H1x3, H2x3 ) indicates the energized status of the PV side and the grid side, and short-circuit protection is provided for the indicator lights and lines through fuses (FU1x3, HU1x3) respectively. Emergency tripping operation of the island device (QF1) is realized through the manual emergency tripping button (SB). An intermediate relay circuit is reserved for extended functions such as electrical interlocking and remote tripping. A data acquisition, analysis and visualization display section is set up. The communication concentrator (CH1) communicates with the intelligent combiner box of the PV power station to collect the operating parameters of the PV power generation system. The PV module and inverter power generation data collected by the communication concentrator (CH1), the operating parameters of the anti-islanding device (QF1) and the monitoring parameters of the multi-function instrument (MPU) are collected and analyzed in real time through the intelligent touch screen (HM1). The power generation status of the PV module and the working status of the inverter are evaluated and diagnosed, and local visualization display and data query services of the PV power station are realized. The operating parameters and alarm information required by the cloud-based PV power station operation and maintenance platform are uploaded through the intelligent touch screen (HM1), realizing unattended and efficient operation and maintenance of the PV power station. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the components of the primary circuit of the present invention;

[0013] Figure 2 This is a schematic diagram of the monitoring part of the multifunctional intelligent instrument of the present invention;

[0014] Figure 3 This is a schematic diagram of the CF metering circuit of the photovoltaic meter of the present invention;

[0015] Figure 4 It is a schematic diagram of the state indication part of the present invention;

[0016] Figure 5This is a schematic diagram of the data collection, analysis and visualization display part of the present invention. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-5 A grid-connected cabinet with intelligent monitoring function, including primary circuit components, multifunctional intelligent instrument monitoring part, photovoltaic meter CF metering circuit, status indication part and data acquisition analysis and visualization display part. The primary circuit components include incoming circuit breaker (QF1-1-4), surge circuit breaker (QFS), surge protector (SPD), anti-islanding device (QF1), disconnector (GS) and connecting copper busbar and busbar. The multifunctional intelligent instrument monitoring part includes current transformer (TC, TB, TA), multifunctional instrument (MPU), fuse ( The PV meter CF metering circuit includes metering current transformers (TC, TB, TA), fuses (Fua, Fub, Fuc), terminal block (J1) and connecting wires. The status indication part includes indicator lights (H1x3, H2x3), fuses (FU1x3, HU1x3), manual emergency trip button (SB), intermediate relays (KA1, KA2) and connecting wires. The data acquisition, analysis and visualization display part includes an intelligent touch screen (HM1), a centralized communicator (CH1) and connecting wires.

[0019] The components of the primary circuit are set up to collect the generated current and energy and form a current channel. Under the control of the above components, automatic grid connection is completed. A multifunctional intelligent instrument monitoring part is set up to collect the primary circuit current signal through the current transformer (TC, TB, TA), connect and multifunctional instrument (MPU) through fuses (Fua, Fub, Fuc), collect the primary circuit voltage signal and provide short-circuit protection. The fuse (Fu1) is connected to provide working power to the multifunctional instrument (MPU) and provide short-circuit protection. Through the connection of the communication port of the multifunctional instrument (MPU), the touch screen COM2 port reads the monitoring parameters of the multifunctional instrument. A photovoltaic meter CF metering circuit is set up to collect the primary circuit current signal through the current transformer (Ta, Tb, Tc), and collect the primary circuit voltage signal through the fuse (Fua, Fub, Fuc) for the photovoltaic meter measurement of the power company. A status indication part is set up, which is respectively indicated by indicator lights (H1x3, H2x3) Indicates the energized status of the PV side and the grid side, and performs short-circuit protection on the indicator lights and lines through fuses (FU1x3, HU1x3) respectively. The emergency tripping operation of the island device (QF1) is realized through the manual emergency tripping button (SB). The intermediate relay circuit is reserved for extended functions such as electrical interlocking and remote tripping. The data acquisition, analysis and visualization display part is set up. The communication concentrator (CH1) communicates with the intelligent combiner box of the PV power station to collect the operating parameters of the PV power generation system. The PV module and inverter power generation data collected by the communication concentrator (CH1), the anti-islanding device (QF1) operating parameters and the monitoring parameters of the multi-function instrument (MPU) are collected and analyzed in real time through the intelligent touch screen (HM1). The power generation status of the PV module and the working status of the inverter are evaluated and diagnosed, and the local visualization display and data query service of the PV power station are realized. The operating parameters and alarm information required by the cloud-based PV power station operation and maintenance platform are uploaded through the intelligent touch screen (HM1), realizing unattended and efficient operation and maintenance of the PV power station.

[0020] The incoming end of the incoming circuit breaker (QF1-1-4) is connected to the busbar through a connecting copper busbar, and a connecting copper busbar is led out from the busbar and connected to the outgoing end of the island device (QF1). At the same time, a connecting copper busbar is led out from the busbar and connected to the surge circuit breaker (QFS), and the surge circuit breaker (QFS) is connected to the surge protector (SPD) through a connecting busbar. The grounding terminal of the surge protector (SPD) is connected to the grounding protection busbar. The incoming end of the island device (QF1) is connected to the outgoing end of the disconnector (GS) through the connecting busbar, and the incoming end of the disconnector (GS) is connected to the connecting busbar for grid-connected cable connection.

[0021] The current transformer (TC, TB, TA) is installed on the upper connection busbar of the island device (QF1). After connecting the secondary connection terminals of the current transformer (TC, TB, TA) through the connecting wire, a connecting wire is led out to be connected to the grounding protection busbar. After connecting the Ia, Ib, and Ic terminals of the multi-function instrument (MPU) with the connecting wire, a connecting wire is led out to be connected to the grounding protection busbar. Three connecting wires are led out from the primary of the current transformer (TC, TB, TA) and connected to the Ia, Ib, and Ic terminals of the multi-function instrument (MPU) respectively. The busbar (A / B) at the upper end of the island device (QF1) is connected to the grounding protection busbar. / C), and connect them to the inlet terminal of the fuse (Fua, Fub, Fuc), lead out the connecting wire from the outlet terminal of the fuse (Fua, Fub, Fuc), and connect them to the Ua, Ub, and Uc terminals of the multi-function meter (MPU), lead out the connecting wire from the busbar A, and connect it to the inlet terminal of the fuse (Fu1), lead out the connecting wire from the outlet terminal of the fuse (Fu1), and connect it to the L terminal of the multi-function meter (MPU), lead out the connecting wire from the busbar N, and connect it to the N terminal of the multi-function meter (MPU), lead out the connecting wire from the AB terminal of the multi-function meter (MPU), and connect it to the COM2 port of the touch screen.

[0022] The current transformer (Ta, Tb, Tc) is mounted on the upper connecting busbar of the disconnector (GS). After the secondary terminals of the current transformer (Ta, Tb, Tc) are connected through connecting wires, a connecting wire is led out and connected to the grounding protection busbar. After the Ia', Ib', and Ic' terminals of the terminal block (J1) are connected with connecting wires, a connecting wire is led out and connected to the grounding protection busbar. Three connecting wires are led out from the primary of the current transformer (Ta, Tb, Tc) and connected to the Ia, Ib, and Ic terminals of the terminal block (J1). Connecting wires are led out from the upper connecting busbar (A / B / C) of the disconnector (GS) and connected to the incoming line terminal of the fuse (Fua, Fub, Fuc). Connecting wires are led out from the outgoing line terminal of the fuse (Fua, Fub, Fuc) and connected to the Ua, Ub, and Uc terminals of the terminal block (J1).

[0023] Lead out the connection wire from the busbar (L1 / L2 / L3) at the lower end of the island device (QF1) and connect it to the incoming terminal of the fuse (FU1x3). Lead out the connection wire from the outgoing terminal of the fuse (FU1x3) and connect it to the incoming terminal of the PV-side power indicator (H1x3). Lead out the connection wire from the outgoing terminal of the PV-side power indicator (H1x3) and connect it to the busbar N. Lead out the connection wire from the busbar (A / B / C) at the upper end of the island device (QF1) and connect it to the incoming terminal of the fuse (FU2x3). Lead out the connection wire from the outgoing terminal of the fuse (FU2x3). Lead out the connecting wire from the line end and connect it to the incoming line terminal of the power-on indicator light (H2x3) on the grid side. Lead out the connecting wire from the outgoing line terminal of the power-on indicator light (H1x3) on the grid side and connect it to the busbar N. Lead out the connecting wire from the incoming line terminal of the normally open contact of the manual emergency trip button (SB) and connect it to the terminal 3 of the island device (QF1). Lead out the connecting wire from the incoming line terminal of the normally open contact of the manual emergency trip button (SB) and connect it to the terminal 4 of the island device (QF1). Connect the connecting wires from all the terminals of the intermediate relay (KA1, KA2) to the reserved terminals.

[0024] Lead out two communication lines through the COM1 communication terminal of the smart touch screen (HM1) and connect them to the communication concentrator (CH1). Lead out two communication lines from the COM2 communication terminal of the smart touch screen (HM1) and connect them to the communication terminals A and B of the anti-islanding device (QF1) and the multi-function instrument (MPU). Lead out two connection lines from the DI1 terminal of the multi-function instrument (MPU) and connect them to the remote signal output terminal of the surge protector (SPD).

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A grid-connected cabinet with intelligent monitoring function, including primary circuit components, multifunctional intelligent instrument monitoring part, photovoltaic meter CF metering circuit, status indication part and data collection analysis and visualization display part, characterized in that: The primary circuit components include incoming circuit breakers (QF1-1-4), surge circuit breakers (QFS), surge protectors (SPD), anti-islanding devices (QF1), disconnectors (GS), connecting copper bars and busbars; the multifunctional intelligent instrument monitoring part includes current transformers (TC, TB, TA), multifunctional meters (MPU), fuses (Fua, Fub, Fuc, Fu1) and connecting wires; the photovoltaic meter CF metering circuit includes metering current transformers (TC, TB, TA), fuses (Fua, Fub, Fuc), terminal blocks (J1) and connecting wires; the status indication part includes indicator lights (H1x3, H2x3), fuses (FU1x3, HU1x3 ), manual emergency trip button (SB), intermediate relays (KA1, KA2) and connecting wires, the data acquisition analysis and visualization display part includes an intelligent touch screen (HM1), a centralized communicator (CH1) and connecting wires, the current transformer (TC, TB, TA) is mounted on the upper end of the island device (QF1) and connected to the busbar, and after connecting the secondary terminals of the current transformer (TC, TB, TA) through the connecting wire, a connecting wire is led out and connected to the grounding protection busbar, and a connecting wire is led out from the Ia, Ib, and Ic terminals of the multi-function instrument (MPU) and connected to the grounding protection busbar, and three connecting wires are led out from the primary of the current transformer (TC, TB, TA) and connected to the multi-function instrument Lead out the connection wires from the busbar (A / B / C) at the upper end of the island device (QF1) to the incoming line of the fuse (Fua, Fub, Fuc), lead out the connection wires from the outgoing line of the fuse (Fua, Fub, Fuc) to the Ua, Ub, Uc terminals of the multi-function meter (MPU), lead out the connection wires from the busbar A to the incoming line of the fuse (Fu1), lead out the connection wires from the outgoing line of the fuse (Fu1) to the L terminal of the multi-function meter (MPU), lead out the connection wires from the busbar N to the N terminal of the multi-function meter (MPU), lead out the connection wires from the AB terminal of the multi-function meter (MPU) to the COM2 port of the touch screen, and lead out the connection wires from the island device (QF1) to the COM2 port of the touch screen. Lead out the connection wire from the busbar (L1 / L2 / L3) connected to the lower end of the island device (QF1), connect it to the incoming end of the fuse (FU1x3), lead out the connection wire from the outgoing end of the fuse (FU1x3), connect it to the incoming end of the PV-side live indicator light (H1x3), lead out the connection wire from the outgoing end of the PV-side live indicator light (H1x3) and connect it to the connecting busbar N, lead out the connection wire from the busbar (A / B / C) connected to the upper end of the island device (QF1), connect it to the incoming end of the fuse (FU2x3), lead out the connection wire from the outgoing end of the fuse (FU2x3), connect it to the incoming end of the grid-side live indicator light (H2x3), lead out the connection wire from the outgoing end of the grid-side live indicator light (H1x3) and connect it to the connecting busbar N,Lead the connecting wire from the normally open contact input terminal of the manual emergency trip button (SB) to the terminal 3 of the island device (QF1), lead the connecting wire from the normally open contact input terminal of the manual emergency trip button (SB) to the terminal 4 of the island device (QF1), and connect the connecting wires from all the terminals of the intermediate relay (KA1, KA2) to the reserved terminals.

2. A power connection cabinet with intelligent monitoring function according to claim 1, characterized in that: The incoming end of the incoming circuit breaker (QF1-1-4) is connected to the busbar through a connecting copper bar, and a connecting copper bar is led out from the busbar to the outgoing end of the island device (QF1). At the same time, a connecting copper bar is led out from the busbar to the surge circuit breaker (QFS), and the surge circuit breaker (QFS) is connected to the surge protector (SPD) through a connecting busbar. The grounding terminal of the surge protector (SPD) is connected to the grounding protection busbar. The incoming end of the island device (QF1) is connected to the outgoing end of the disconnector (GS) through the connecting busbar, and the incoming end of the disconnector (GS) is connected to the connecting busbar for grid-connected cable connection.

3. The power connection cabinet with intelligent monitoring function according to claim 1, characterized in that: The current transformers (Ta, Tb, Tc) are mounted on the upper connecting busbar of the disconnector (GS); after the secondary connecting terminals of the current transformers (Ta, Tb, Tc) are connected by connecting wires, a connecting wire is led out and connected to the grounding protection busbar; after the connecting terminals Ia', Ib', and Ic' of the connecting block (J1) are connected by connecting wires, a connecting wire is led out and connected to the grounding protection busbar; three connecting wires are led out from the primary of the current transformers (Ta, Tb, Tc) and connected to the Ia, Ib, and Ic terminals of the connecting block (J1); a connecting wire is led out from the upper connecting busbar (A / B / C) of the disconnector (GS) and connected to the incoming line terminal of the fuse (Fua, Fub, Fuc); a connecting wire is led out from the outgoing line terminal of the fuse (Fua, Fub, Fuc) and connected to the Ua, Ub, and Uc connecting terminals of the connecting block (J1).

4. The power connection cabinet with intelligent monitoring function according to claim 1, characterized in that: Lead out two communication lines through the COM1 communication terminal of the smart touch screen (HM1) and connect to the communication concentrator (CH1); lead out two communication lines from the COM2 communication terminal of the smart touch screen (HM1) and connect to the anti-islanding device (QF1) and the communication terminals A and B of the multi-function instrument (MPU); lead out two connection lines from the DI1 terminal of the multi-function instrument (MPU) and connect to the remote signal output terminal of the surge protector (SPD).

Images