A Method for Allocation of Power Generation Margin in Photovoltaic Power Stations Considering Grid Security Constraints

Abstract

The invention relates to a power generation margin distribution method for a photovoltaic power station based on power grid security constraints and belongs to the field of running and control technologies of new energy electric power systems. The power generation margin distribution method for the photovoltaic power station based on power grid security constraints includes that according to a fair scheduling principle, after the photovoltaic power station enters a free power generation state, the space of a power grid for performing photovoltaic power generation is uniformly distributed for each photovoltaic power station according to a minimum load rate deviation method, on the one hand, unnecessary photovoltaic power discarding due to a too small active set value of the photovoltaic power generation is avoided, and on the other hand, the problem that the power output by the photovoltaic power generation surpasses the power grid bearing capacity due to a too large active set value due to distributing the photovoltaic power generation capacity is avoided. The power generation margin distribution method for the photovoltaic power station based on power grid security constraints is integrated in a photovoltaic power generation active control master station run by a dispatching center to enable the system to implement an optimal control strategy in real time according to the photovoltaic power generation running state and the power grid running state, maintain enough backspin security space for the power grid, guarantee the active power security of the section of a connecting wire of the photovoltaic power station and the power grid and guarantee the fair scheduling among the photovoltaic power stations.

Description

technical field [0001] The invention relates to a method for allocating a power generation margin of a photovoltaic power station taking into account the safety constraints of a power grid, and belongs to the technical field of operation and control of new energy access to power systems. Background technique [0002] The characteristics of strong randomness of optical resources, difficulty in forecasting, and anti-peak regulation make it more difficult to dispatch and control the active power of the power grid. How to maximize the utilization of photovoltaic power generation resources and absorb as much photovoltaic power generation as possible under the premise of ensuring the safety of the power grid has become one of the common challenges faced by the power grids where photovoltaic power generation bases are located. At present, the industry has conducted a lot of research on active power dispatching control after photovoltaic power generation is connected, and has achiev...

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Problems solved by technology

The main problems of this method are: (1) relying on the experience of operators, it is difficult to guarantee the fairness of dispatching; (2) when the security of the power grid is not limited and there is room for photovoltaic power generation, the manual control method cannot restore the active power of photovoltaic power plants in time. (3) In the free state, if the power of the photovoltaic power station increases rapidly and the grid receiving space is limited, it is easy to cause safety problems in the grid

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