Controller design method for suppressing low-frequency oscillation through energy storage
A technology of low-frequency oscillation and design method, which is applied in the direction of design optimization/simulation, reduction/prevention of power oscillation, reduction of AC network flicker, etc. It can solve the problem that the proportional-integral controller is difficult to realize the change of the state of charge, and improve the storage capacity. Energy utilization, efficient and stable oscillation suppression, and the effect of suppressing oscillation
Active Publication Date: 2021-03-02
FOSHAN ELECTRIC POWER DESIGN INST +1
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[0003] The purpose of the present invention is to provide a controller design for energy storage to suppress low-frequency oscillations, so as to solve the problem that it is difficult for traditional proportional-integral controllers to realize energy storage and suppress low-frequency oscillations so that the change in state of charge of itself is zero
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Embodiment 1
[0053] refer to Figure 1~4 , on the hardware platform where the processor is Inter(R) Core(TM) i9-9820X CPU@3.30GHz, MATLAB / Simulink software is selected to realize the simulation experiment of the present invention. Reference attached figure 2 The simulation model is built, and the parameter values of the controller design are shown in Table 1. Synchronous generator speed error curve see image 3 , the results show that the energy storage device can effectively suppress the low-frequency oscillation under the control of the controller of the present invention. Under the control of the controller of the present invention, the state of charge change curve of the energy storage device is shown in Figure 4 , it can be seen that when the speed error of the synchronous generator is zero, the variation of the state of charge also converges to zero, which shows that the controller of the present invention can control the energy storage device to effectively suppress low-fre...
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The invention provides a controller design method for suppressing low-frequency oscillation by energy storage, which constructs a frequency domain expression of the state of charge variation of an energy storage device during suppression of low-frequency oscillation based on a transfer function model, and designs a controller capable of realizing suppression of low-frequency oscillation by energystorage through the frequency domain expression. The controller designed by the invention has the beneficial effects of simple structure, stable control effect and easiness in engineering practice. Furthermore, the controller is applied to the synchronous generator grid-connected control system, and through simulation verification, the controller has a better response effect in suppressing low-frequency oscillation of a power system. Therefore, the method has a wide application prospect.
Description
technical field [0001] The invention relates to the technical field of low-frequency oscillation suppression in electric power systems, and specifically discloses a controller design method for energy storage to suppress low-frequency oscillation. Background technique [0002] After large-scale grid-connection of renewable new energy with random output, the phenomenon of low-frequency oscillation in the power system frequently occurs. The traditional measure to suppress low-frequency oscillations is: superimpose an excitation voltage increment output by the power system stabilizer on the excitation voltage of the synchronous generator. This measure suppresses low-frequency oscillations based on the angle of voltage and reactive power control, and has achieved large-scale Engineering Applications. However, the root cause of the low-frequency oscillation of the power system is the imbalance between the supply and demand of the active power of the system, which leads to the ac...
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Login to View More IPC IPC(8): H02J3/00H02J3/24H02J3/28G06F30/20
CPCH02J3/002H02J3/24H02J3/28G06F30/20Y02E70/30
Inventor 杨勇李涛
Owner FOSHAN ELECTRIC POWER DESIGN INST