Virtual power plant primary frequency control method based on distributed projection subgradient method

Abstract

The invention discloses a virtual power plant primary frequency control method based on a distributed projection subgradient method, which comprises steps: one or more relations: a power generation cost function of a distributed power generation unit, a power generation cost micro-increasing function of an ith distributed power generation unit, active power output restrictions of distributed powergeneration units and a communication coefficient matrix between the distributed power generation units is or are firstly determined; and based on the determined relations, primary frequency modulation control is carried out between the distributed power generation units in the virtual power plant. The primary frequency control method makes full use of the characteristics of the distributed projection subgradient method to realize primary frequency modulation of the virtual power plant, and while the frequency is stabilized, the power generation cost and the renewable energy utilization rate can be optimized.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, in particular to a primary frequency control method of a virtual power plant based on a distributed projection subgradient method. Background technique [0002] In recent years, distributed renewable energy generation has experienced rapid growth and changed the operation mode of traditional distribution networks, and more and more regions are facing the problem of high penetration of renewable energy generation. However, due to its own randomness, high-penetration distributed generation may cause serious disturbances in the system and bring significant challenges to the operation of the distribution network. In addition, most photovoltaic and wind power are connected to the grid through power electronic inverters or asynchronous motors. Since their frequencies are completely decoupled from external systems, the system inertia will be severely reduced, resulting in a se...

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Problems solved by technology

Due to the complexity of the communication network, the centralized strategy may encounter many technical challenges, such as communication delay and single point of failure

In addition, any change in the system structure will result in a reconfiguration of the control model in the centralized controller

Due to the lack of coordination in droop control, there are also problems such as non-optimal power distribution and poor dynamic performance.

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