New energy available capability assessment method considering transient security constraints

Abstract

The invention discloses a new energy available capability assessment method considering transient security constraints, belongs to the field of new energy available capability assessment. According to the invention, on the basis of the EEAC theory, transient security constraints are added into an existing new energy available capability assessment method; and on the basis of the existing assessment method with peak and frequency modulation constraints as reference, full consideration is given to the transient security stability constraints of an outgoing channel, the transient power angle stability margin, transient voltage security margin and transient frequency drop acceptability margin are quantified, and the unit adjustment sequence is determined according to the magnitude of sensitivity of the output adjustment of a new energy unit under a buckling mode. The invention is capable of achieving optimal output adjustment of the new energy unit under a transient buckling forbidden faulty set, and meanwhile achieving the new energy grid-connected maximum availability while satisfying safe and stable operation of a power grid.

Description

technical field [0001] The invention belongs to the field of evaluation of new energy acceptance capacity, and in particular relates to an evaluation method for evaluating the ability of a power grid to accept large-scale grid-connected new energy from the perspective of power grid transient security and stability. Background technique [0002] In recent years, the grid-connected scale of wind power photovoltaic new energy installations has grown rapidly, and the large-scale development and utilization of new energy has alleviated the problems of traditional energy depletion and environmental pollution to a certain extent. However, new energy represented by wind power and photovoltaics has the characteristics of output uncertainty, randomness, and anti-peak regulation. Its grid-connected access has brought great difficulties to the planning, operation and scheduling of the power grid. In addition, due to the decoupling of wind power photovoltaic unit speed and grid frequency...

AI Technical Summary

Problems solved by technology

However, the evaluation method based on peak regulation and frequency regulation constraints only considers conventional factors such as peak-to-valley difference coefficient, forced output capacity, and regional exchange power from the peak and frequency regulation requirements of the entire network, and ignores the constraints of the grid structure of new energy grid-connected points; The economic dispatch evaluation method evaluates the optimal receiving capacity from the perspective of comprehensive economic benefits of new energy grid connection

These methods either take peak shaving and frequency modulation into account but ignore channel constraints, or simply evaluate the acceptance capacity of new energy from economic indicators. The measurement of the acceptance capacity of new energy is relatively one-sided and limited, and they do not comprehensively and systematically consider the constraints of the entire network. and local stability checks to be comprehensively evaluated, so it needs to be further improved

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