DC grid transmitting and receiving end combined peak regulation optimization method considering source network load constraints

Abstract

The invention discloses a dc grid transmitting and receiving end combined peak regulation optimization method considering source network load constraints, and can solve the technical problems that a 'linear' or 'reverse peak regulation' transmission plan often occurs in the prior art, which causes great difficulty in peak regulation, frequency modulation and operation mode arrangement of a receiving end grid. The method comprises the steps: firstly obtaining day-ahead output prediction data of a wind power plant and a photovoltaic power station; on the basis that a grid sending end power supply meets the requirement of local load power utilization, transmitting the generated surplus electric quantity to the grid receiving end through a high-voltage DC connecting line; taking the minimum total operation cost of a power grid system as an optimization target, taking the power balance constraint, the conventional generator set constraint, the wind curtailment and light curtailment constraint, the DC tie line constraint and the excitation type demand side response constraint as constraint conditions, establishing an optimization model, and obtaining operation power plans of each energysupply device which is accessed to DC, the high-voltage DC tie line and the excitation type demand side response of the receiving end. According to the invention, the energy consumption cost of a useris reduced, and the complementation and collaboration among various energy sources are improved.

Description

technical field [0001] The invention relates to the technical field of peak regulation in electric power systems, in particular to an optimization method for combined peak regulation at sending and receiving ends of a DC power grid considering the constraint of source, network and load. Background technique [0002] With the rapid development of new energy sources such as wind power and photovoltaic power generation, my country has gradually formed a power supply pattern of reverse distribution and centralized grid connection. Incorporate the scope to realize the optimal allocation of resources across the country. New energy power generation has the characteristics of randomness, intermittency, and volatility. There is a strong coupling relationship between the power generation level of new energy bases and DC transmission power. Currently, DC transmission power planning mainly considers system constraints and transmission volume agreements, and seldom considers the receiving...

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Problems solved by technology

[0004] The present invention proposes a combined peak-shaving optimization method for the sending and receiving ends of the DC power grid that considers the constraints of the source network and the load, which can solve the problem that the prior art rarely considers the load demand of the receiving end power grid or coordinates the consideration of new energy output fluctuations and outgoing demand, which often leads to The emergence of "straight-line" or "anti-peak-shaving" transmission plans has brought more difficult technical problems to the peak-shaving frequency modulation and operation mode arrangement of the receiving-end power grid

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