Analysis of renewable energy primary frequency control strategy

摘要

The ability of a renewable energy to achieve inertia and primary frequency regulation depends on its control technology, and its frequency support capability is also closely related to its operating conditions. For example, for wind turbines, under different operating conditions, the rotor speed is different, and the kinetic energy stored in it is different. The change in speed will also affect the capture of wind power. Therefore, the virtual moment of inertia is not constant. At the same time, in the case of adopting the normal reserve method to achieve the frequency control capability once, it will inevitably bring a certain amount of power electricity loss. Therefore, when a large number of asynchronous power generators need to be connected to the power grid, the inertia of the system needs to be re-evaluated. The ability of asynchronous power generators to provide inertia and the frequency control needs to be fully understood. This paper studies the influence of inertia and primary frequency control on the grid-connected power system of non-synchronous power supplies, so as to put forward appropriate requirements for the virtual inertia and primary frequency control capabilities of wind turbines and photovoltaic power generation, and promote the virtualization of wind turbines and photovoltaic power generation equipment in inertia control and primary frequency control technology.