New energy-contained interconnected power system load frequency two-dimensional cloud control method

Abstract

The invention relates to a new energy-contained interconnected power system load frequency two-dimensional cloud control method. According to the method, a control deviation (e) and a deviation changerate (ec) are used as a two-dimensional cloud front-piece generator, while PI parameter setting variables delta P and delta I are used as a one-dimensional cloud back-piece generator. In this way, adouble-condition and single-rule cloud generator suitable for load frequency control is formed. After that, a double-condition and multi-rule cloud generator is formed by a plurality of double-condition and single-rule cloud generators. The deviation and the deviation change rate of the control system are sampled through a two-dimensional cloud model controller. The setting values of PI parametersare output after the reasoning operation of the cloud model controller is carried out. A cloud model is used for achieving real-time optimization of load frequency control parameters under the condition that uncertain loads such as new energy are introduced. Therefore, the dynamic static quality and the robustness of load frequency control are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of grid frequency control of electric power systems. A two-dimensional cloud control method for load frequency of interconnected power system with new energy is proposed. This method is a two-dimensional cloud control of load frequency based on cloud theory, which is suitable for the uncertainty control of load frequency in interconnected power systems under the intervention of new energy (solar) and can effectively improve the robustness of the system. Background technique [0002] Today's large-scale interconnected power grid can enable adjacent areas to support each other, but while achieving huge operating and investment benefits, it will also bring frequency deviation in the area and power fluctuations in tie lines, and the larger the system capacity, the exchange of tie lines With greater power comes the risk of systemic accidents and widespread blackouts. In addition, in recent years, large-scale ne...

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Problems solved by technology

[0005] However, with the increase in the scale and capacity of new energy power plants, the decision variables and state variables also double continuously, and the power system becomes increasingly complex. Only using predictive control can easily cause frequency fluctuations in the system, thereby increasing the frequency regulation burden of the system.

The current control methods and algorithms are still difficult to meet the increasing scale of new energy access, so the design of LFC controllers needs further research

Therefore, solving the LFC controller quality deterioration problem caused by the uncertainty (system structure, parameter change, random load disturbance, etc.) in the actual power system operation is the focus and difficulty of the present invention's research

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