User handling process for distributed power supply installation
Grid-connected technology and application of distributed power supply

User handling process for distributed power supply installation

1. Submit a grid connection application Users go to the corresponding city or county-level customer service center to apply for distributed power, fill in the access application form, and submit relevant supporting documents and materials. The power grid company implements the “one-certificate acceptance” of the business hall for the installation business of distributed power customers. […]

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Improving power quality with distributed power sources
Grid-connected technology and application of distributed power supply

Improving power quality with distributed power sources

Although the introduction of distributed power sources will bring some power quality problems to the system, distributed power sources also have the potential to improve power quality. (1) Distributed power supply has backup and emergency functions. Distributed power supply has a small capacity of a single unit, a large number of units, and a relatively […]

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Improvement measures for power quality
Grid-connected technology and application of distributed power supply

Improvement measures for power quality

(1) Steady-state voltage control. For the steady-state or quasi-steady-state power quality problems where the voltage deviates from the ideal state, such as voltage deviation, conventional voltage control methods or the installation of reactive power compensation equipment can be used to solve the problem. For example, by adjusting the excitation current and other means, change the […]

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Power control and voltage regulation of distributed power sources
Grid-connected technology and application of distributed power supply

Power control and voltage regulation of distributed power sources

Active Power Control The distributed power supply connected to the grid through the voltage level of 10(6)~35kV shall have active power regulation capability, and can adjust the active power output of the power supply according to the power grid frequency value, power grid dispatching agency instructions and other signals, to ensure that the output power […]

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Island operating conditions
Grid-connected technology and application of distributed power supply

Island operating conditions

The general standard stipulates that the distributed grid-connected power generation system must stop outputting power within 2s when the island appears, which affects the utilization rate of the power generation system to a certain extent. With the expansion of distributed generation (DG) scale and capacity and the increase in power generation after DG is connected to […]

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Island operation mode and control method
Grid-connected technology and application of distributed power supply

Island operation mode and control method

Island operation mode Under normal operation, the main power supply system and DG jointly supply power to the surrounding loads, and when the power supply system loses pressure, the DG independently continues to supply power to a certain part of the user’s power grid. DG and local loads form a small isolated grid called an […]

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Common maximum power tracking control methods
Grid-connected technology and application of distributed power supply

Common maximum power tracking control methods

The following describes the tracking control method of the maximum power point control link: 1. Constant pressure tracking method The principle of constant voltage tracking method: when the temperature is constant, the maximum power point voltage of the solar cell is near both sides of a certain voltage point, as shown in Figure 1. When ignoring […]

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Grid-connected operation control of photovoltaic power generation
Grid-connected technology and application of distributed power supply

Grid-connected operation control of photovoltaic power generation

The commonly used grid-connected control of photovoltaic systems mainly includes two closed-loop control links: the maximum power point control link and the output waveform control link. 1. Maximum power point control link According to the output characteristics of photovoltaic cells, under certain sunshine intensity and temperature, the output power of photovoltaic cells can reach the […]

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Wind power generation grid-connected operation control
Grid-connected technology and application of distributed power supply

Wind power generation grid-connected operation control

Distributed wind power and photovoltaic power are the main components of distributed power, usually connected to medium-voltage or low-voltage power distribution systems, which can effectively make up for the lack of large-scale centralized power generation and transmission. The grid-connected distributed generation system has the advantages of effectively utilizing electric energy, but it must meet the […]

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Grid-connected equipment selection and reactive power configuration of distributed power
Grid-connected technology and application of distributed power supply

Grid-connected equipment selection and reactive power configuration of distributed power

Grid-connected equipment selection (1) General principles. The selection of engineering equipment for distributed power supply access to the user’s distribution network should follow the following principles: ① Distributed power supply access system engineering should select equipment whose parameters and performance meet the safe and reliable operation of power grid and distributed power supply. ② The […]

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