Distributed photovoltaic power generation anti-reflux device

Abstract

The utility model discloses a distributed photovoltaic power generation anti-reflux device, and relates to the technical field of photovoltaic power generation, the distributed photovoltaic power generation anti-reflux device comprises an ammeter, a collector, an inverter and a mutual inductor, the signal input end of the ammeter is mutually coupled with the signal output end of the mutual inductor, the induction end of the mutual inductor is coupled with a transformer, and the transformer is connected with the collector. The mutual inductor is installed on the outlet side of the transformer and surrounds a power transmission line, the signal output end of the electricity meter and the signal input end of the collector are mutually coupled, the signal output end of the collector is coupled to the signal input end of the inverter, the load is coupled to the lower portion of the mutual inductor, and the inverter is coupled to the lower portion of the transformer. Compared with the prior art, the utility model has the advantages that the transformer is used for directly acquiring the power consumption of the load at the outlet side of the transformer, the real-time power consumption condition of the load can be accurately acquired, the control of the photovoltaic generating capacity by the acquisition device is more accurate, and the problem of countercurrent caused by mismatching of the generating capacity and the load is effectively avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic power generation technical field, concretely is distributed photovoltaic power generation anti -backflow device. BACKGROUND

[0002] In the distributed photovoltaic power generation system, when photovoltaic power generation is greater than local load power consumption, the redundant electric energy can flow into the power grid reversely, which not only can influence the stability of the power grid, but also can cause the power grid company to impose fines on the user etc. The current common anti -backflow method has some deficiencies, for example, part of method cannot accurately adjust photovoltaic power generation according to load power consumption in real time, or the device structure is complex, the cost is higher etc.

[0003] Therefore, the distributed photovoltaic power generation anti -backflow device can accurately collect load power consumption and effectively control photovoltaic power generation to prevent the device of backflow. UTILITY MODEL CONTENT

[0004] The utility model relates to photovoltaic power generation technical field, concretely is distributed photovoltaic power generation anti -backflow device.

[0005] To realize above -mentioned purpose, the utility model provides the following technical scheme: distributed photovoltaic power generation anti -backflow device, including electric meter, collector, inverter and mutual inductor, the signal input end of electric meter and mutual inductor signal output end are mutually coupled, the inductive end of mutual inductor is coupled with transformer, and the mutual inductor is installed on the export side of transformer and surrounds on transmission line.

[0006] As a further scheme of the utility model: the signal output end of electric meter and the signal input end of collector are mutually coupled, the signal output end of collector is coupled in the signal input end of inverter, the load is coupled below mutual inductor, and the signal output end of inverter is coupled with photovoltaic power generation unit.

[0007] As a further scheme of the utility model: the mutual inductor is used to gather the current, voltage numerical value of transformer export side, the electric meter is used to gather the analog type of mutual inductor output, and analog signal is converted into digital signal, carries out preliminary processing and analysis, calculates the real -time power consumption of current load.

[0008] As a further scheme of the utility model: the mutual inductor is used to gather the current and voltage information in line, and high voltage, large current is converted into low voltage, small current signal handled by electric meter, to provide accurate load power data basis for the whole device.

[0009] As a further scheme of the utility model: the collector and electric meter are electrically connected and are used to receive the load power consumption numerical value sent by electric meter.

[0010] Compared with the prior art, the utility model discloses the beneficial effect lies in:

[0011] 1, the utility model discloses a transformer export side load power consumption is directly gathered through mutual inductor, can accurate acquisition load real -time power consumption, make the control of collector to photovoltaic power generation more accurate, effectively avoid the problem of backflow caused by the mismatch of power generation and load;

[0012] 2, the utility model discloses three parts of intelligent electric meter, mutual inductor and collector composition, relatively simple structure, easy to install, maintain and debug, reduce the equipment cost and operation and maintenance difficulty;

[0013] 3, the utility model discloses through effectively prevent the backflow phenomenon, guarantee the stability of distributed photovoltaic power generation system and grid connection, reduce the bad influence to the grid, improve the reliability of entire power system;

[0014] 4, the utility model discloses the data storage and communication function of having through collector, convenient for user to the analysis and management of system operation data, realize remote monitoring and control simultaneously, improve the intelligent level and management efficiency of system.

[0015] The other advantages, objects and features of the utility model will be described in the subsequent specification to some extent, and to some extent, it will be obvious to those skilled in the art based on the study of the following text or can be taught from the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The utility model discloses a circuit diagram.

[0017] Fig. 1, intelligent electric meter;2, collector;3, inverter;4, load;5, mutual inductor;6, photovoltaic power generation unit. DETAILED DESCRIPTION

[0018] The specific embodiments of the utility model will be further described below in conjunction with the drawings, and it needs to be explained here that the description of these embodiments is used to help understanding the utility model, but does not constitute the limitation to the utility model.

[0019] In addition, the technical features involved in each embodiment of the utility model described below can be coupled with each other as long as they do not conflict with each other.

[0020] Please refer to the attached Figure 1The utility model discloses a distributed photovoltaic power generation anti -backflow device, including electric meter 1, collector 2, inverter 3 and mutual -inductor 5, the signal input of electric meter 1 and mutual -inductor 5 signal output are mutually coupled, and the induction end of mutual -inductor 5 is coupled with transformer, and mutual -inductor 5 is installed on the export side of transformer and is surrounded on transmission line,

[0021] Specifically, the signal output of electric meter 1 and the signal input of collector 2 are mutually coupled, the signal output of collector 2 and the signal input of coupling in inverter 3, load 4 is coupled below mutual -inductor 5, and inverter 3 signal output is coupled with photovoltaic power generation unit 6,

[0022] Among them, mutual -inductor 5 is used for gathering the current, voltage numerical value of transformer export side, electric meter 1 is used for gathering the analog model of mutual -inductor 5 output, and analog signal is converted into digital signal, carries out preliminary processing and analysis, calculates the real-time power consumption of current load 4,

[0023] Among them, mutual -inductor 5 is also used for gathering the current and voltage information in line, converts high voltage, large current into low voltage, small current signal for electric meter 1 processing, provides accurate load power data basis for the whole device,

[0024] Among them, collector 2 and electric meter 1 are electrically connected and are used for receiving the power consumption numerical value of load 4 sent by electric meter 1,

[0025] Among them, collector 3 and intelligent electric meter 1 are communicated and are connected, receive the load power consumption data sent by intelligent electric meter 1, and the control strategy and algorithm in collector 3 are preset, according to the control instruction of preset rule to inverter 3 at photovoltaic power generation unit 6, adjust the working state of inverter 3, make it match with the power consumption of load 4, eliminate the occurrence of backflow, simultaneously, collector 3 also has data storage and communication function, can store historical operation data, and can communicate with host computer or remote monitoring center, realizes remote monitoring and control,

[0026] Working principle: mutual -inductor 5 real -time gathers the current and voltage signal of transformer export side and is transmitted to intelligent electric meter 1, and intelligent electric meter 1 converts analog signal into digital signal and calculates the load power consumption, then sends data to collector 2, and collector 2 continuously analyzes the load 4 power consumption data and the power generation data of photovoltaic power generation unit 6, adjusts the output power of inverter 3, makes the power generation always equal or less than the power consumption of load 4, effectively prevents the backflow of electric energy,

[0027] Among them, 5 mutual -inductor includes current transformer and voltage transformer, and current transformer and voltage sensor are installed respectively in Figure 1The key positions shown in the middle are used to collect current and voltage data, and the collected data is transmitted to the smart meter 1 through the line, and the smart meter 1 transmits the signal to the collector 2, and the collector 2 processes the data to determine whether the load 4 power consumption and photovoltaic power generation match, always ensure that the photovoltaic power generation is less than or equal to the load 4 power consumption, to prevent reverse flow. Embodiments

[0028] Equipment selection and installation:

[0029] The transformer 5 is selected: according to the current and voltage level of the transformer outlet side, select the appropriate transformer ratio and precision, for example, for the line with current of 100A, you can choose 100:5 ratio, precision of 0.2 level of current transformer, for 10kV voltage level line, select 10000:100 ratio of voltage transformer, the transformer is tightly surrounded and installed on the power transmission line, ensure firm installation, primary side and secondary side wiring correct, polarity error-free;

[0030] The smart meter 1 is selected: select the smart meter 1 with RS485 or Modbus communication interface, which can meet the local load power consumption measurement and data transmission requirements, install the smart meter 1 in the distribution box near the load, according to the meter wiring diagram, correctly access the power transmission line, ensure accurate measurement;

[0031] The collector 2 is selected: select the collector 2 with multi-channel analog signal input, digital signal communication interface, install the collector 2 near the transformer 5 and smart meter 1, connect the collector 2 with the inverter 3 and the smart meter 1 through the shielded control cable, the collector 2 is connected with the inverter 3 for controlling the photovoltaic power generation, and is connected with the smart meter 1 for receiving the power consumption digital signal;

[0032] System debugging and optimization:

[0033] Hardware debugging: check whether the wiring of the transformer 5, smart meter 1, collector 2 and controller is correct and firm, test the electrical performance of the equipment using multimeter, oscilloscope and other tools, ensure the normal work of the equipment, check the accuracy of the transformer, use standard source input signal, compare the output of the transformer with the theoretical value, adjust or replace when the deviation exceeds the allowed range;

[0034] Software debugging: download the software program written to the collector 2 and controller, check whether the data communication between the collector 2 and the controller is normal, verify the accuracy and integrity of data transmission, test the control effect of the controller on the inverter 3 under different simulation of light and load conditions, adjust the control strategy and algorithm parameters according to the test results, optimize the system performance;

[0035] Whole test: whole test is carried out in actual distributed photovoltaic power generation system, and system operation state is continuously monitored, and the data such as the power generation of photovoltaic power generation unit 6, the power consumption of load 4, the output power of inverter 3 are recorded, and the system is further optimized according to the test data, and it is ensured that the system can stably and reliably operate, and effectively prevent the reverse flow of electric energy.

[0036] The above front, rear, left, right, top and bottom are based on the Figure 1 of the drawings.

[0037] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the protection scope of the utility model.

[0038] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the described embodiments.

[0039] For those skilled in the art, various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and still fall within the protection scope of the utility model.

Claims

1. A distributed photovoltaic power generation anti-backflow device, comprising an electric meter (1), a collector (2), an inverter (3) and a mutual inductor (5), characterized in that: The signal input end of the electric meter (1) is coupled with the signal output end of the mutual inductor (5), the sensing end of the mutual inductor (5) is coupled with a transformer, the mutual inductor (5) is installed on the outlet side of the transformer and surrounds the power transmission line; The signal output end of the electric meter (1) is coupled with the signal input end of the collector (2), the signal output end of the collector (2) is coupled with the signal input end of the inverter (3), and the signal output end of the inverter (3) is coupled with the photovoltaic power generation unit (6).

2. The distributed photovoltaic power generation anti-flow-back device according to claim 1, characterized in that: The mutual inductor (5) comprises a current mutual inductor and a voltage mutual inductor, and the current mutual inductor and the voltage mutual inductor are located on the outlet side of the transformer.

3. The distributed photovoltaic power generation anti-flow-back device according to claim 1, characterized in that: Further comprising a load (4) coupled below the mutual inductor (5).

Images