Energy storage damping control method for restraining broadband oscillation of new energy power system
A power system, damping control technology, applied in the direction of reducing/preventing power oscillation, circuit devices, AC network circuits, etc. Effect
Active Publication Date: 2018-02-27
STATE GRID CORP OF CHINA +1
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Problems solved by technology
As the complexity of the oscillation mode of the new energy power system continues to increase, this method of designing a damping controller for a certain oscillation mode may lead to the problem of "considering one thing and losing the other". Therefore, it has higher adaptability and is suitable for new energy power systems. Energy storage controllers with damping effects for both medium and high frequency oscillations and low frequency oscillations are still to be studied
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[0092] The present invention provides an energy storage damping control method for suppressing broadband oscillations of new energy power systems, such as figure 2 The verification is carried out in the calculation example of 4 machines and 2 areas including wind power grid-connected. In this calculation system, the wind turbines are connected to the bus 6 through the step-up transformer and the outgoing line, and the installed capacity of the wind farm is 600MW. The control method includes The following steps:
[0093] a. Determine the capacity of the energy storage device and the installation location of the energy storage device
[0094] a1. For the power system with new energy connected to the grid, through simulation analysis, it is obtained that the tie line L that has the risk of power oscillation in the power system i , connecting line L i The busbars at both ends are numbered M and N respectively, and the M side of the busbar has more grid-connected new energy capa...
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The invention discloses an energy storage damping control method for restraining broadband oscillation of a new energy power system, and relates to safe and stable control over new energy power systems. According to the method, firstly, the capacity and installation location of an energy storage device are determined; secondly, the law of influence on the transient energy of a power grid is analyzed after the energy storage device is installed, and a control policy for the energy storage device is designed according to the purpose of facilitating transient energy decrement of a power grid system; finally, according to the control policy of the energy storage device, an energy storage damping controller is designed; not only is a great inhabitation effect achieved on both low-frequency oscillation and high-frequency oscillation in the new energy power system, but also the method has great adaptivity to a complex oscillation pattern of the new energy power system, and meanwhile, the method has high robustness under the situation that the power output of new energy is highly random. The method not only achieves the great inhabitation effect on both low-frequency oscillation and high-frequency oscillation in the new energy power system, but also has great adaptivity and robustness.
Description
technical field [0001] The present invention relates to power systems, in particular to an energy storage damping control method for suppressing broadband oscillations in new energy power systems, which is mainly suitable for suppressing low-frequency oscillations and high-frequency oscillations in new energy power systems, and has good adaptability and robustness Stickiness. Background technique [0002] Large-scale new energy grid integration has become a development trend of energy strategies in various countries. However, with the increase of grid-connected new energy capacity, the damping of certain oscillation modes in the power system continues to decrease, which increases the risk of power oscillation in the grid. In recent years, there have been many power oscillation accidents of wind farms at home and abroad, which lead to the off-grid operation of large-scale wind turbines, which seriously threatens the security and stability of the power system. Therefore, in ...
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Login to View More IPC IPC(8): H02J3/24
CPCH02J3/24H02J2203/20
Inventor 刘巨方仍存欧阳俊杨东俊赵红生王博易柏年乔立赵雄光魏聪赵爽
Owner STATE GRID CORP OF CHINA