Power grid region oscillation suppression method based on adaptive predictive control system

Abstract

The invention belongs to the technical field of power system operation and control, and particularly relates to a power grid region oscillation suppression method based on a self-adaptive predictive control system, which is used for suppressing power oscillation among power grid regions. According to the method, a low-order linearization parameter model corresponding to a power grid side system is constructed, and model parameters are identified in combination with historical data; on the basis of the model, constructing a model prediction control system to optimize a subsequent direct current line power regulation and control instruction, and acting on a power grid rectification controller to enable a power grid side to operate in a closed loop; constructing a conditional random disturbance instruction calculation model of the direct-current power modulation quantity, and designing a power grid side open-loop operation mode based on the conditional random disturbance instruction calculation model; and setting the switching period of the open / closed loop operation mode, and regularly executing the model parameter identification and updating work. The method has the advantages that on the basis of a traditional MPC system, the conditional random disturbance module is designed, so that the power grid side is in regular open-loop operation, the model identification precision is improved through open-loop operation data, and the control effect is improved.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, and in particular relates to a power grid regional oscillation suppression method based on an adaptive predictive control system. Background technique [0002] Inter-regional power oscillations in power systems not only seriously affect the stable operation of the power grid, but also have a greater impact on the stable transmission of inter-regional power. Therefore, it is necessary to study the control measures for power oscillations in AC and DC power systems. In the existing research, Power System Stabilizer (PSS) is often used to enhance damping to suppress low-frequency oscillations, but the damping effect on inter-regional oscillation modes is poor, and the problem of a large number of installations is more complicated. In recent years, the DC modulation method has also been tried to suppress inter-regional power oscillations, but its control accuracy needs to be...

AI Technical Summary

Problems solved by technology

Unlike the open-loop identification process where there is basically no correlation between the system input and output, the correlation between the system input and the noise (process noise and environmental noise, mainly caused by the feedback path, that is, the controller) in the closed-loop identification process will cause the model There are deviations in the parameter identification results, and even in the case of low signal-to-noise ratio, the coupling of the above-mentioned input and noise will make the identification results wrong, causing the MPC to issue wrong commands, causing system instability

However, try to make the grid-side system in an open-loop operation mode, and then conduct model identification by collecting information, which will increase the risk of system instability.

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