A method for optimal configuration of power grid spinning reserve under power-limited operation state of wind farm

Abstract

The invention discloses a method for optimally configuring a power grid's rotating reserve in a power-limited operating state of a wind farm. This method gives the calculation formula of the secondary frequency regulation static index of the wind farm power grid under the wind power limited operation state. With the goal of minimizing the operation cost of the power grid, considering the constraints of the secondary frequency regulation static index of the power grid, a wind farm limit is proposed. The spinning reserve optimization model under power operation better solves the problem of a significant increase in the secondary frequency regulation spinning reserve of the power grid caused by wind power fluctuations, and enhances the frequency stability of the power grid. The optimization model can absorb more wind power into the grid.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a method for optimally configuring a power grid's spinning reserve in a power-limited operating state of a wind farm. Background technique [0002] With the rapid growth of my country's economy, the demand for and dependence on electricity is increasing. The large amount of greenhouse gas emissions has made the world's climate problem more and more prominent. The use of new energy to gradually replace the existing fossil energy will be the development direction of the future power system power supply. As the most economical and mature renewable energy power generation technology, wind power has become the choice of almost all countries committed to the development and utilization of renewable energy. The new installed capacity of global wind power in 2015 was 63GMW, and the cumulative installed capacity reached 432GW. Compared with the same period in 20...

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Problems solved by technology

[0005] (2) The integration of wind turbines without speed regulation function into the power grid will reduce the composite frequency response characteristic coefficient of the system;

[0006] (3) The volatility of wind power increases the frequency regulation pressure of synchronous generators

[0008] (1) Modeling of wind turbines is mostly based on the maximum wind energy utilization mode, and seldom modeled in the mode of limited power operation;

[0009] (2) The impact of wind power limited power operation and participation in frequency regulation on frequency stability is less considered;

[0010] (3) The spinning reserve optimization problem under the limited power operation of wind farms is seldom mentioned

[0013] Traditional synchronous generator spinning reserve optimization configuration methods all operate the wind farm in the MPPT state, and do not consider the impact of the wind farm's power-limited operating state on the wind farm's spinning reserve capacity

With the continuous increase of wind power installed capacity, wind power needs to gradually participate in grid frequency regulation, and more wind turbines participating in frequency regulation are in a state of limited power, so the traditional spinning reserve configuration method in the MPPT state of wind farms cannot adapt to the existing operation state

[0014] 2. Does not consider grid frequency stability constraints

The conventional spinning reserve configuration method only considers the index of synchronous generator spinning reserve capacity, and pays less attention to the ability of the grid to track wind power fluctuations, which will lead to sufficient grid spinning reserve capacity, but cannot be better due to the frequency regulation speed limit of synchronous generators. Tracking wind power fluctuations of

Due to the lack of frequency stability constraints, the existing optimal configuration strategy for spinning reserve cannot quantitatively determine how much wind power can be absorbed by the existing grid, resulting in waste of wind power

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