Photovoltaic power station low-frequency oscillation suppression method based on active disturbance rejection control

Abstract

The invention belongs to the field of an electric system, and specifically relates to a method for suppressing large-scale photovoltaic power station power system low-frequency oscillation by utilizing an active-disturbance-rejection additional damping controller to adjust active output of a photovoltaic system. The method, taking a large-scale photovoltaic power station as an object of study, designs a photovoltaic power station active additional damping control strategy with active disturbance rejection control and MPPT control being combined, and designs and sets an active disturbance rejection controller through a separation principle; the angular velocity of a synchronous generator serves as the input of the active disturbance rejection controller; and the output signal of the controller is added to a constant power control outer ring after amplitude limiting, thereby achieving an effect of suppressing the power system low-frequency oscillation. The method has a good control effect for single-machine and multi-machine power system low-frequency oscillation; and the controller has high robustness.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a method for suppressing low-frequency oscillation of a power grid by a photovoltaic power station based on active disturbance rejection control. Background technique [0002] With the continuous development of my country's economy, the society will put forward higher requirements for the demand and quality of energy, which forms a sharp contradiction with the depletion of traditional energy coal, oil, and natural gas, as well as pollution problems. The development and utilization of new energy is a way out to alleviate this contradiction. Solar energy itself is inexhaustible, and photovoltaic power generation is safe and clean, which can reduce environmental pollution and improve energy structure. my country's photovoltaic power generation is developing rapidly. By the end of 2015, the cumulative installed capacity has exceeded 400,000 kilowatts, especially in Qinghai, ...

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Problems solved by technology

Zhou Lin, Yu Xirui, Guo Ke and others proposed a design method for large-scale photovoltaic power station to suppress low-frequency oscillation controller of power system (patent number: 201510303945.5), which considered the power angle and voltage factors, but did not consider the maximum power point tracking (MPPT) ) control, can not maximize the use of light energy

Zhang Haining, Wang Dongfang, Li Chunlai and others proposed a coordinated control method for the additional damping of photovoltaic storage power generation systems (patent number: 201510746928.9), which realizes the mode switching between photovoltaic grid-connected inverters and batteries during the oscillation process, and can suppress System power oscillates, but its controller is not robust

The structure and operation mode of the power system change frequently. It is a high-order, multi-variable, and strongly coupled system. The control effects of classic PID and traditional PSS are easily affected by system changes, and it is difficult to meet the control requirements.

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