A Method of Suppressing Subsynchronous Oscillation in Light-Fire Bundling Based on Improved Active Disturbance Rejection
A technology of synchronous oscillation and self-disturbance rejection, which is applied in the field of power system, can solve problems such as difficulty in effective coordination, high requirements for system model accuracy, and limitations of control functions, so as to enhance adaptability, ensure rapid convergence and stability , The effect of parameter changes is obvious
Active Publication Date: 2022-04-29
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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Problems solved by technology
However, when using PID control, it is difficult to effectively coordinate between "overshoot" and "rapidity", and the accuracy of the system model is required to be high
At the same time, photovoltaic power plants are greatly affected by climate and light, and have high requirements for the adaptability of controller parameters. Traditional PID control is difficult to adapt to the complex and changeable characteristics of photovoltaic operating conditions.
Using modern control methods such as intelligent algorithms to optimize the control parameters of PID, although the suppression effect of subsynchronous oscillation can be improved, but it is highly dependent on the accuracy of the system model, resulting in limitations in its control function
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[0045] The present invention will be further described below in conjunction with specific embodiments and accompanying drawings. This embodiment is implemented on the premise of the technical method of the present invention, and a detailed implementation process is given, but the protection scope of the present invention is not limited to the following embodiments.
[0046] The main process of this embodiment is as figure 1 shown, and with figure 2 The photovoltaic and thermal power bundled and sent out system via series compensation is taken as an example for illustration.
[0047] image 3 The designed photovoltaic additional damping controller based on active disturbance rejection.
[0048]The speed deviation signal Δω of the thermal power unit is collected through the measurement link. Since there is a certain electrical transmission distance between the thermal power unit and the photovoltaic power station, the delay in the transmission process of the signal is consid...
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The invention discloses a method for suppressing subsynchronous oscillation of light-fire bundling based on improved self-disturbance rejection. This method introduces nonlinear active disturbance rejection control on the basis of traditional damping controller for photovoltaic and thermal power bundling through series compensation sending system. The designed improved active disturbance rejection additional damping controller collects the speed deviation signal of the thermal power unit through the measurement link, and obtains the speed components in each oscillation mode as the control object after filtering; through tracking differentiator, extended state observer, nonlinear error The four links of feedback and disturbance estimation and compensation enable each speed component to track its reference value without overshoot in a short period of time; and use fuzzy control to adjust the parameters of error feedback to adapt to the characteristics of large fluctuations and changeable operating states of photovoltaics ; Finally, the generated control signal is superimposed on the current control link of the photovoltaic inverter to enhance the system damping. The invention provides a new idea for suppressing subsynchronous oscillation involving new energy grid connection.
Description
technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to a method for suppressing subsynchronous oscillation of light-fire bundling based on improved self-disturbance rejection. Background technique [0002] Solar energy is a clean and renewable energy that has been vigorously developed in recent years. As the capacity of photovoltaic power plants increases, bundling them with traditional thermal power is an economically feasible power transmission method. In the AC transmission system, the series compensation technology is generally used to improve the transmission capacity of the transmission line. However, the AC series compensation may cause the interaction between the generator and the grid, resulting in the subsynchronous oscillation of the thermal power unit, which seriously affects the stable operation of the power system. [0003] Existing research has paid little attention to the subsynchronous oscillation ...
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IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/383H02J3/24H02J2203/20Y02E10/56
Inventor 高本锋姚磊
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)