Method for tuning active control parameter based on second level power disturbance of photovoltaic power station

Abstract

The present invention discloses a method for tuning active control parameters based on a second level power disturbance of a photovoltaic power station. The photovoltaic power station is connected toa power grid. The method comprises the following steps: characteristic parameters of the power grid are obtained; and the characteristic parameters include a frequency fluctuation characteristic parameter of the power grid, a primary frequency modulation characteristic parameter of a traditional generator set and a set frequency of the power grid. A frequency modulation dead zone target value, a frequency modulation limiter and a droop characteristic parameter in the active control parameters of the photovoltaic power station are determined according to the characteristic parameters so that the frequency modulation of the photovoltaic power station and the primary frequency modulation of the traditional generator set are successively operated in a time dimension and operated stage by stagein a frequency dimension. The invention tunes the active control parameters of the photovoltaic power station according to the actual situation of the photovoltaic power station access to the power grid, is conducive to giving full play to the active control performance of the photovoltaic power station, improves the immunity of the photovoltaic power station to the second level power disturbanceof the power grid, and is conducive to the rapid recovery of the power grid after a large disturbance.

Description

technical field [0001] The invention relates to the technical field of power system control, in particular to an active control parameter tuning method based on second-level power disturbance of a photovoltaic power station. Background technique [0002] The new energy represented by photovoltaics has the characteristics of non-pollution and renewable, so this new energy is more and more widely used in the field of power generation. The existing grid can adopt grid-connected photovoltaic power generation system, such as figure 1 As shown, that is, the photovoltaic power station is connected to the existing grid through the inverter, and the power generated by the photovoltaic power station is transmitted to the existing grid. Among them, since the electricity on the grid is alternating current, the electricity generated by the photovoltaic power station is direct current. , so the direct current generated by the photovoltaic power plant needs to be converted into alternatin...

AI Technical Summary

Problems solved by technology

However, the power generation of photovoltaic power plants has the characteristics of intermittent and volatility. With the increase of its penetration power, the frequency characteristics of the overall power system will gradually deteriorate, which is not conducive to the safe and stable operation of the power grid, making the power grid face greater frequency regulation. pressure

From the perspective of the power grid, when a high proportion of new energy sources are connected to the grid, it is extremely difficult for the traditional generator sets (thermal power generators, hydroelectric generators and gas generators) in the grid to adjust the frequency, resulting in a mismatch between the actual frequency adjustment capability and the grid demand. The frequent adjustment of the generating set is easy to accelerate the fatigue accumulation of the generating set. In order to reduce the adjustment frequency of the traditional generating set and improve the stable operation ability of the power grid, it is necessary to actively control the power disturbance of the existing photovoltaic power station itself in seconds

Existing photovoltaic power plants use centralized or string inverters, and use high-performance information communication technology, global operating state perception and other technologies to achieve active frequency control of second-level power disturbances in photovoltaic power plants, but the existing active control parameters are Initially set by the manufacturer, without considering the actual frequency regulation requirements of the power grid, it does not meet the requirements of the power grid where the photovoltaic power station is located on its frequency active control, and cannot give full play to the active control performance of the photovoltaic power station, so that the photovoltaic power station can control the second-level power disturbance of the power grid Poor effect, poor noise immunity

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