There are two different types of wind power generation, namely: off-grid type that operates independently and grid-connected type that operates connected to the power system. Off-grid wind power generation is small in scale and can solve the power supply problem in remote areas through energy storage devices such as batteries or in combination with other energy generation technologies (such as wind power/hydropower complementary systems, wind power-diesel unit combined power supply systems). Grid-connected wind power generation is a large-scale wind farm, with a capacity of approximately several megawatts to hundreds of megawatts, and is composed of dozens or even hundreds of wind turbines. Grid-connected wind farms can be compensated and supported by the large power grid, and more fully exploit the available wind resources, which is the main development direction of wind power generation at home and abroad. In an increasingly open electricity market environment, the cost of wind power generation will continue to decrease. If the indirect benefits brought by environmental and other factors are taken into account, wind power is also economically very attractive. The reason why grid-connected wind farms have developed rapidly around the world is not only due to their advantages in energy and environmental protection, but also because the wind farms themselves have the following advantages:
(1) Short construction period for wind turbines It and its auxiliary equipment are modular and easy to design and install. The transportation and installation time of a single wind turbine does not exceed three months. The construction period of a 10MW wind farm does not exceed one year, and it can be put into operation after one installation. tower.
(2) The actual land area is small and the requirements for land quality are low. The equipment building area in the wind farm only accounts for about 1% of the wind farm, and the rest of the site can still be used for agriculture, animal husbandry, and fishing.
(3) The operation management is highly automated and can be unattended. On the other hand, wind power generation is limited by its primary energy source - wind energy.
Concerns about the conditions for connecting wind turbines to the grid and the direction of transmission
In order to send electricity out, small wind power generation needs to be connected to the grid, and the wind turbines are connected to the grid through the grid. of electricity is sent out. If the power from the wind turbine is only for your own use, then you also need to consider getting the power sent back from the grid when there is no wind. Otherwise, how will you use the power when there is no wind? So we still need to connect to the grid and get power from the grid. Of course, if the wind power generation is only for your own use, and you use the power from the grid when there is no wind, it does not matter, and the wind power generation does not need to be connected to the grid.
I entered a wind power related company across majors I am working in an enterprise, and I would like to ask, what is the difference between the often referred to as "connecting to the grid" and "connecting to the Internet"?
The 690v alternating current generated by the wind turbine is boosted to 35KV through a single box transformer next to the wind turbine, and then transported to the booster station (wind farm) to be boosted to 220KV, and finally connected to the regional power grid, which is the municipal power grid. level grid. The regulation of power is actually the flow direction of current, similar to the working principle of a battery. Functional power provides energy and flows from high voltage to low voltage. A voltage drop is formed due to the potential difference. In fact, the phase difference is the potential difference in AC. To explain the electrical system, direct current is the potential difference, and alternating current is the phase difference. andReactive power is to supplement the loss of the power grid. Just like the positive electrode of the battery flows to the negative electrode to generate voltage, and the internal flow of the battery from the negative electrode to the positive electrode generates electromotive force. The electromotive force and voltage are equal in magnitude and opposite in polarity. The same is true for active power and reactive power, but reactive power and active power are not equal. , the polarity is opposite.
Grid-connected and connected to the Internet mean the same thing, both refer to wind power being fed into the grid.
However, wind power generation is alternating current with unstable voltage and frequency. If it is to be integrated into the power grid, a wind turbine converter device is required. To put it simply, it is a frequency stabilizing and voltage stabilizing device connected between the wind turbine and the power grid. Between the power grids, it ensures the power quality of wind power grid connection and ensures safer and more reliable operation of the power grid.