Commercial and Industrial Photovoltaics

Distributed photovoltaic power generation system for industry and commerce, also known as decentralized power generation or distributed energy supply, refers to the configuration of smaller photovoltaic power supply systems at or near the user's site to meet the specific needs of users, support the economic operation of existing distribution networks, or meet both requirements simultaneously. The basic equipment of a distributed photovoltaic power generation system includes photovoltaic cell modules, photovoltaic array brackets, DC combiner boxes, DC distribution cabinets, grid connected inverters, AC distribution cabinets, etc. In addition, there are power supply system monitoring devices and environmental monitoring devices.

Overview

Distributed photovoltaic power generation system for industry and commerce, also known as decentralized power generation or distributed energy supply, refers to the configuration of smaller photovoltaic power supply systems at or near the user's site to meet the specific needs of users, support the economic operation of existing distribution networks, or meet both requirements simultaneously. The basic equipment of a distributed photovoltaic power generation system includes photovoltaic cell modules, photovoltaic array brackets, DC combiner boxes, DC distribution cabinets, grid connected inverters, AC distribution cabinets, etc. In addition, there are power supply system monitoring devices and environmental monitoring devices. Its operating mode is that under the condition of solar radiation, the solar cell module array of the photovoltaic power generation system converts the solar energy into output electrical energy, which is centrally sent to the DC distribution cabinet through the DC combiner box. The grid connected inverter inverts the AC power to supply the building's own load, and the excess or insufficient power is regulated by connecting to the power grid.

applied value

Distributed Basic Principles

Mainly based on the surface of buildings, solve users' electricity problems nearby, and achieve compensation and external transmission of power supply differences through grid connection.

advantage

1. Photovoltaic power sources are located on the user side and generate electricity to supply local loads. They are considered as loads and can effectively reduce dependence on the power grid and minimize line losses.

2. By fully utilizing the surface of buildings, photovoltaic cells can be used as building materials simultaneously, effectively reducing the footprint of photovoltaic power plants.

3. Effective interface with smart grid and microgrid, flexible operation, and the ability to operate independently of the power grid under appropriate conditions.

shortcoming

1. The direction of power flow in the distribution network will change in a timely manner, and reverse power flow will cause additional losses. Relevant protections need to be re tuned, and transformer taps need to be constantly changed, among other issues.

2. The difficulties in voltage and reactive power regulation, as well as the technical challenges in controlling the power factor after the integration of high-capacity photovoltaics, will also increase short-circuit power.

3. It is necessary to carry out load management in the energy management system at the distribution network level, under the condition of large-scale photovoltaic access. New requirements have been placed on secondary equipment and communication, increasing the complexity of the system.

System Network Structure

Main Features

1. Platform based design, modular implementation, and strong scalability;

2. Support the integration of photovoltaic equipment from different manufacturers for centralized monitoring;

3. Comprehensive monitoring of environmental center, output parameters, and electricity indicators for photovoltaic power plants;

4. DC switch status, inlet electrical parameters of distributed generation intelligent access control equipment, outlet electrical parameters of distributed generation intelligent access control equipment, AC switch status, grid parameters of grid connection points, electricity meters, online monitoring devices for power quality, and centralized monitoring of energy storage systems;

case