Full-distributed secondary frequency modulation method for power system microgrid

Abstract

The invention relates to a full-distributed secondary frequency modulation method for a power system microgrid, and belongs to the technical field of power system operation and control. In the method, firstly, the power generation cost functions of a traditional energy distributed power supply and a renewable energy distributed power supply are designed, and the tiny-increasing rates of the traditional energy distributed power supply and the renewable energy distributed power supply are obtained by derivation. A distributed data acquisition and information interaction structure is provided, a subgradient-based consistency algorithm is adopted, and according to data collected by the distributed power supplies and exchanged information, an output power adjustment amount is obtained by iterative computation so as to carry out real-time control of the output power of the distributed power supplies. According to the full-distributed secondary frequency modulation method, power generation cost is guaranteed to be lowest in a secondary frequency modulation process while the frequency realizes quick recovery, and power is reasonably distributed between the distributed power supplies. According to the control method, the frequency oscillation of the microgrid can be avoided, the full-distributed secondary frequency modulation of the microgrid can be realized, and microgrid operation economy is improved.

Description

technical field [0001] The invention relates to a fully distributed secondary frequency modulation method for a power system microgrid, belonging to the technical field of power system operation and control. Background technique [0002] The development of distributed generation can optimize the energy structure, promote energy conservation and emission reduction, and achieve sustainable economic development. In recent years, the distributed grid connection of renewable energy has promoted the development of microgrid and has become an important part of the new smart grid. [0003] With the increasing penetration of wind power and photovoltaic power generation, due to the fluctuation, intermittent and uncertainty of renewable energy output, coupled with the rapid change of load and the small inertia coefficient of the system, it is guaranteed that the microgrid is in the isolated grid state. The control system required for safe and reliable operation in the environment will...

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Problems solved by technology

However, there are many problems in this method: First, the communication network required for centralized control is extremely large and complex, which not only increases the cost, but also greatly increases the possibility of communication failure, which reduces the reliability of microgrid operation

However, the current distributed control method has problems such as slow frequency modulation speed and the inability to consider the economy of secondary frequency modulation.

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