Probabilistic power flow analysis method considering primary frequency modulation uncertainty

Abstract

The invention discloses a probabilistic power flow analysis method considering primary frequency modulation uncertainty. A dynamic power flow model considering primary frequency modulation characteristics is established, the problem of uncertainty in the model is handled by applying a point estimation method, a Newton-Raphson's method is adopted to solve the certainty power flow problem, and accordingly statistical characteristic values of the primary frequency modulation characteristics of a system and system frequency, node voltage and other state variables during coefficient uncertainty are considered under the situation of disturbance uncertainty. Due to the fact that the necessarily existing uncertainty of a power generator and load unit regulation power is considered in the dynamic power flow model design considering primary frequency modulation characteristics, the state variables closer to the actual conditions can be obtained, and more accurate data can be provided for relevant analytical calculation. By means of the probabilistic power flow analysis method, the operating state of the system can be more effectively and accurately described, and a foundation is laid for further analytical calculation of the power system. In addition, the point estimation method has the advantages of being high in speed and low-order accuracy rate and the like, and an effective way is provided for achievement of the method.

Description

technical field [0001] The invention relates to the technical field of power system steady-state power flow calculation, in particular to a probabilistic power flow analysis method considering the uncertainty of primary frequency modulation. Background technique [0002] In recent years, with the depletion of fossil energy, the increasingly serious problem of environmental pollution and the continuous development of new energy power generation technology, the scale of clean, environmentally friendly and renewable new energy represented by wind power is gradually expanding. The proportion of power generation to the total power generation of the system is also increasing. But at the same time, the inherent randomness and intermittent characteristics of these new energy sources also make the uncertainty and volatility of the grid operation more and more obvious. Therefore, how to effectively consider these uncertainties and disturbances in the power flow calculation to obtain ...

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Problems solved by technology

This is caused by the fact that the dead zone and the adjustment parameter R of the unit are not set according to the requirements.

It can be seen that there is randomness in whether the generator participates in primary frequency regulation. On the other hand, the unit regulated power of the load is directly related to the type of load. Different load compositions have great differences in primary frequency regulation performance.

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