Solar power generation is a useful supplement to traditional power generation. Given its importance to environmental protection and economic development, all developed countries are all committed to promoting solar power generation. At present, small and medium-sized solar power has formed an industry. There are two ways of solar power generation: photovoltaic power generation and solar thermal power generation. Among them, photovoltaic power generation has the outstanding advantages of simple maintenance and large or small power. It is widely used as a medium-sized and small-sized grid-connected power supply. Photovoltaic power generation systems are connected in two forms: centralized grid-connected and distributed grid-connected. Centralized grid connection: The characteristic is that the power generation can be directly transmitted to the large power grid, and the power supply to the user is uniformly allocated by the large power grid, and the power exchange with the large power grid is one-way. It is suitable for large-scale photovoltaic power plants to be connected to the grid, usually far away from the load point, and the desert photovoltaic power station is connected to the grid in this way. Decentralized grid-connected: also known as distributed photovoltaic power grid-connected, characterized in that the emitted electrical energy is directly distributed to the power load, and excess or insufficient power is regulated by connecting the large power grid, and the power exchange with the large power grid may be It is two-way. Suitable for small-scale photovoltaic power generation systems, usually urban photovoltaic power generation systems use this approach, especially for building combined photovoltaic systems. With the country's strong support for household distributed PV, the installed capacity is expected to reach 60GW in 2020, which will exceed the centralized PV power plant. Therefore, more and more ordinary people are beginning to contact PV. However, many people lack some professional knowledge about photovoltaics and electricians. Therefore, today, the world of glory will give you a detailed introduction of the correct connection method of the electricity meter when photovoltaic grid connection. At present, the photovoltaic grid-connected electric meter is divided into three-phase electric meter and single-phase electric meter. When the inverter capacity of the photovoltaic power station is 5Kw or less, the inverter is connected with the electric meter, and the single-phase electric meter can be used. First of all, let us first take a look at the basic principles of three-phase and single-phase electricity and what is the difference between them. What is three-phase electricity, what is single-phase electricity? Three-phase power A generator capable of generating equal amplitudes, equal frequencies, and 120° phase difference between each other is called a three-phase generator; A three-phase generator is used as a power source, which is called a three-phase power source; a circuit that is powered by a three-phase power source is called a three-phase circuit, also called a three-phase power. China's power system is a three-phase four-wire system! Three phase lines and one zero line, U, V, W are called three phases, the voltage between phase and phase is line voltage, the voltage is 380V; the phase line and the neutral line are called phase voltage, and the voltage is 220V. If the load between each phase is unbalanced, it will cause a zero voltage offset, that is, some voltages relative to the zero line are higher than 220 volts, and some are lower than 220 volts. Both the generator output and the high voltage power transmission are three-phase power. Household electricity Both use 220 volts, which is a combination of any phase line (one of the three lines U, V, W, commonly known as the fire line) and the zero line. Because only one phase is used, it is single-phase electricity. Regardless of whether the household appliance is two feet or the three feet are single-phase. The two holes of the household socket are: a fire line and a zero line. Generally, all-plastic household appliances are plugs with two feet. The three holes of the household socket are: a fire line, a zero line, and a ground line. A household appliance with a metal casing is a plug with three feet. Single-phase electricity and three-phase electricity In electrotechnics, only single-phase electricity and three-phase electricity, even if it is special to use two hot wires (phase line) 380V voltage, can only be called single-phase 380V. Single-phase electricity is part of three-phase electricity. One-phase three-phase electricity (three-phase four-wire) can be divided into three-way single-phase electricity. Most of the public housing is 6 layers, perhaps related to three-phase electricity, and each phase is supplied with two layers. The floor surface can balance the three-phase electric load and the three-phase electric power can be fully utilized. After understanding the three-phase electricity and single-phase electricity, everyone has a basic understanding of household electricity. The following is a small power station installed for most home users, generally below 5KW. Since the inverter is a single-phase output, a two-way meter (single-phase) needs to be installed when the grid is connected. The two-way electric meter commonly used in the market is as shown in the figure below. There are 6 terminals, 1, 3 are incoming lines, 4 and 6 are outgoing lines, and 2, 5 are pulse output ports. Generally, they are not wired and used for power station test meter accuracy. Meter installation, two-way meter and user meter how to install Through the structure diagram of the two-way electric meter above, it can be clearly seen that the mains of the mains is connected to the bidirectional terminal 1, the zero line is connected to the terminal 4 of the two-way electric meter, the outlet terminal of the bidirectional electric meter is connected to the unidirectional electric meter terminal 1, and the outgoing line 6 is connected to the terminal 3. The load is terminated by a unidirectional meter 2, 4 terminal. To achieve self-use and surplus power access, a user's household electric meter should be added to the user side to measure the total power generation of the photovoltaic power station. The specific wiring method is as follows. Schematic 1: A two-way meter, a one-way meter Schematic 2: A two-way meter + a one-way meter Schematic 3: A two-way meter + two one-way meters Schematic diagram of the wiring terminal of three-phase electric meter three-phase electric meter The 1, 4, and 7 terminals of the three-phase electric meter are A, B, and C three-phase incoming lines, and the 3, 6, and 9 are A, B, and C three-phase outgoing lines. Terminal 10 is connected to the neutral line N. Three-phase electric meter photovoltaic grid-connected electric meter installation wiring diagram Before grid connection, we must first know the color of three-phase electricity: phase A (first phase) is yellow, phase B (second phase) is green, and phase C (third phase) is red. At present, there are mainly the following types: A, B, C phase or L1, L2, L3 phase or U, V, W phase, the order is the same, the grid diagram is shown below. Schematic 1: Three-phase two-way electric meter + one-way electric meter Schematic 2: Three-phase two-way electric meter + three-phase one-way electric meter + one-way electric meter Schematic 3: Three-phase two-way electric meter + three-phase one-way electric meter In addition to the installation according to the above figure, the user must additionally consider installing air switches and leakage protection devices to ensure the safety of household electricity. In addition, everyone needs to pay attention to the fact that before installing the meter, it is necessary to have a professional electrician to operate the basic personnel to avoid accidents caused by unnecessary operation caused by the operation.
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