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Today, I will introduce a national invention authorized patent - two-way metering three-phase smart energy meter. The patent was applied for by the Electric Power Research Institute of Guangdong Power Grid Corporation, and was granted an announcement on September 14, 2016.
Content descriptionThe invention relates to the technical field of household distributed energy generation and grid connection, in particular to a two-way metering three-phase smart electric energy meter.
Background of the InventionAt present, there are generally two ways to connect household distributed energy power generation to the grid. One is the grid-connected plan under the policy of "on-grid electricity price, unified purchase and sales", which is to connect the PV meter before the user's meter (that is, on the side of the grid). ), a dual-meter grid-connected metering solution is required. The other is the grid-connected scheme under the "net electricity metering" policy, which measures the power generation and consumption of distributed power stations over a long period of time. For the above two metering and grid-connected solutions, double-meter metering is required. The use of two electricity meters not only increases the cost, but also requires more space. At the same time, it increases the failure rate and increases the maintenance cost.
SUMMARY OF THE INVENTIONIn view of the above problems, the present invention provides a two-way metering three-phase smart energy meter. It includes an input front end, an output back end, a three-phase metering module, a built-in power relay, a first control end and a second control end; the input front end is connected to the three-phase mains grid, and the output back end is connected to the first A contactor unit and a second contactor unit, wherein the first contactor unit is connected to a distributed energy generation grid, and the second contactor unit is connected to a three-phase load; connected between the input front end and the output back end There are the three-phase metering module and the built-in power relay, and the three-phase metering module is used to measure the electricity flowing through.
The first control end is connected to the first contactor unit, the second control end is connected to the second contactor unit, and the first control end or the second control end is connected to the first contactor The unit or the second contactor unit sends control information to control the closing and opening of the first contactor unit or the second contactor unit.
The input front end is connected to the three-phase four-wire city power grid, the three-phase four-wire power grid is connected to the three-phase smart energy meter, and the output back end of the meter is connected to the user load end through the second contactor unit (ie, the second contactor unit, the same below). At the same time, the electric energy meter control 2 (ie, the second control terminal) can output control information to control the contactor unit 2, which can realize the closing and opening of the contactor, and isolate the user load terminal from the front end. In addition, the output rear end of the electric energy meter is connected in parallel to the contactor unit 1 (ie, the first contactor unit, the same below), the rear end of the contactor unit 1 is connected to the inverter and main control system of the power generation device, and the rear end of the inverter main control system The terminal is connected to the power generation device. The power meter output control 1 (ie, the first control terminal) can output control information, control the contactor unit 1, realize the closing and opening of the contactor unit, and disconnect the distributed energy generation grid from the front-end grid.
In addition, the electric energy meter can realize data communication with the power generation device through 485 communication, report relevant real-time data and other information to the main station system of the electric power department through the electric energy meter, and develop some functions to realize the co-management of the electric power department and the user, which can be technically guaranteed. At the same time, it is conducive to the management of safety issues such as islanding effect, strengthens power grid security, and ensures personal safety and electrical safety during grid maintenance.
The smart electric energy meter of this scheme is a wide-range three-phase electric energy meter based on Rogowski coil sampling technology. Compared with conventional electric energy meters, it has a wide voltage working range (phase voltage AC45V ~ 300V), a wide current measurement range (5 ~ 100A), super Wide temperature working range (-40℃～70℃), low temperature rise, stable error, anti-strong magnetic, anti-DC component and so on.
Compared with the general technology, the invention solves the conventional grid-connected metering method of double-meter type through the bi-directional metering technology, and can integrate functions such as intelligent data acquisition, parameter management, etc., and is an ideal bi-directional metering for household distributed energy generation and grid connection. Smart table scheme. The invention adopts the intelligent electric energy meter of bidirectional metering technology for grid connection, and the electric energy meter can be configured as algebraic and metering method or absolute value metering method, and has active power forward, active power reverse, reactive power forward, and reactive power reverse metering. Features. Only one meter needs to be used for bidirectional metering, which saves cost and space, and reduces the failure rate. At the same time, the invention can realize the system management function, the electric energy meter and the power generation device invert, protect the main control system to realize communication, and carry out data interaction, not only can the data be reported to the main station system, which is beneficial to the management of the power part, and can open some functions to the user. , to achieve co-management by the power sector and users.
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