What is a distribution network? What is the relationship between distribution network and distributed photovoltaic power generation?
Distribution network, also known as distribution network. It is a network in which the electricity unit transmits or controls the electric energy within the jurisdiction of the power supply system. It includes three parts: transmission, substation and distribution network. With the increasingly widespread application of the photovoltaic industry, a close connection has been established between the distribution network and distributed photovoltaic power generation. Let's learn more about the connection and difference between distribution network and distributed photovoltaic power generation and how they work together!
I. Overview
Broadly speaking, in a power supply network, all electrical energy and various power sources are transmitted to the electrical terminals through certain lines and various electrical equipment, which is what we often call the distribution network. At present, my country's distribution network is divided into two parts: power supply system (including distribution network) and power consumption system. The power supply system mainly measures and transmits energy locally through various power distribution stations and power consumption units (such as substations and substations). In northern China, most of the power distribution is located in urban areas. Therefore, with the rapid development of industrial production and urbanization, the demand for urban electricity continues to increase, and the reliability of power supply increases year by year, especially in large cities or densely populated areas. Therefore, it is necessary to increase the construction of distribution network and meet the demand for distributed photovoltaic power generation. However, in the construction of power grids in some areas of our country, due to the low level of economic development, the energy provided by the distribution network cannot meet the needs of the rapid growth of electricity consumption.
2. Grid structure
The characteristic of the power distribution network is to connect the power supply or load of the electric unit with the electric line, so as to realize the automatic control of the electric equipment, line and load. In the power system, the power facilities are composed of substations and transmission and distribution networks, and the power facilities are composed of power supply and distribution devices. The distribution network is the transmission and distribution system of electrical energy, and its main function is to ensure the conversion between electrical energy and other electrical energy. There are three basic forms of distribution network: the main grid usually includes the distribution network; the parent grid includes the parent power stations at all levels. The main power grid is mainly composed of substations and transmission facilities; the distribution network mainly includes 35 kV and below transmission and distribution grids; the parent grid includes 35 kV and below transmission and transformation lines and various transformers.
3. Composition of the power system
1. Power transmission system: refers to the power line (electric energy) consisting of power sources with higher transmission power and power sources with lower voltages, generally including lines, substations, switch stations and distribution stations. 2. Substation system: refers to a power conversion device that takes a certain electrical equipment as the center and distributes the power to each distribution tower (or line) through a certain load level, so that it can meet the power demand after the power supply unit needs. voltage and frequency. 3. Power distribution system: It is the first modern power supply system to put forward the theory of modern power distribution in my country. It consists of the main substation of the substation system and the distribution station, and is a distributed power supply system. 4. Power distribution network: The power distribution station is called the user power management center, and the load distribution system of each line and each voltage level is established with the power supply unit as the center. Its role is to ensure reasonable load distribution in the area and enable users to obtain electricity; protect power facilities; and respond quickly to electricity-related incidents.
4. Collaborative work
Although both consist of power points or power supply equipment, they operate differently depending on the environment. The distribution network is divided into "two networks" (the grid structure is established according to the characteristics of power supply users) and "three networks" (power supply user power grid, distribution network power supply user power supply system). "Two networks" is to use the characteristics of the original load scale of the distribution network to merge the original public power grid into a regional scale to form a network. The grid structure and power distribution device are independently constituted by them. "Three Networks" is also called "Three Networks Linkage" (linkage of substations, substations and distribution stations). From the above, it can be seen that the distribution network is the area with the largest power consumption. The distribution network in the area has a relatively large power transmission. The regional distribution network is an independent supply network, and the power consumption unit supplies power to a household. The power supply range is the largest in a distribution network power supply network.
