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| Briefly describe the difference between distributed photovoltaic power station a |
| Release time:2023-03-14 14:40:08| Viewed： |
Characteristics of distributed photovoltaic power stations and basic principles of distributed power stations: mainly based on the surface of buildings, including rooftop solar power stations for residential houses in villages and towns and rooftop photovoltaic power stations for industrial and commercial enterprises, to solve the power consumption and resource utilization problems of users nearby, and to realize the compensation and transmission of power supply differences through grid connection, as well as the self-use of power by enterprises and residents.
一、 Advantages:
1. The photovoltaic power supply is located at the user side, and the power generation supplies the local load, which is regarded as the load, which can effectively reduce the dependence on the national grid power supply and reduce the line loss.
2. By making full use of the building surface, photovoltaic cells can be used as building materials at the same time, effectively reducing the floor area of photovoltaic power stations, and creating economic benefits for users.
3. The effective interface with smart grid and microgrid is flexible in operation. Under appropriate conditions, the grid can operate independently and reduce the power consumption cost of users.
二、 Disadvantages:
1. The direction of the power flow in the distribution network will change in time, the reverse power flow will cause additional losses, the relevant protection needs to be reset, and the transformer tap needs to be constantly changed. At present, with the development and progress of technology, the probability of this situation is less and less.
2. Difficulties in voltage and reactive power regulation, technical difficulties in power factor control after the access of large-capacity PV, and the short circuit power will also increase. At present, with the development and progress of technology, the probability of this situation is less and less.
3. It is necessary to carry out unified load management in the case of large-scale photovoltaic access in the energy management system at the distribution network level. It provides new requirements for secondary equipment and communication, and increases the complexity of the system. At present, with the development and progress of technology, the management of distributed photovoltaic energy is becoming more and more perfect, and the defects are less and less obvious.
The characteristics of centralized photovoltaic power stations and the basic principles of centralized photovoltaic power stations: make full use of the rich and relatively stable solar energy resources in desert areas, barren mountains and collapsed mining areas to build large photovoltaic power stations and aquatic photovoltaic power stations, and connect to the high-voltage transmission system to supply long-distance loads.
一、 Advantages: 
Water photovoltaic power station 二、 Disadvantages:
1. Centralized photovoltaic power stations need to rely on long-distance transmission lines for power transmission and access to the grid. At the same time, they are also a major interference source of the grid. The loss of transmission lines, voltage drop, reactive power compensation and other issues will become prominent.
2. Large-capacity photovoltaic power stations are realized by the combination of multiple conversion devices. The collaborative work of these devices needs to be managed uniformly. At present, this technology is not mature. At present, the accumulation and development of domestic photovoltaic technology experience has basically overcome the problem of power station management.
3. In order to ensure the security of the power grid, large-capacity centralized photovoltaic access needs new functions such as LVRT, which puts forward higher requirements for the construction and operation of centralized power stations, and certainly plays a certain role in promoting the rational and intelligent use of electricity.
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