A Distributed Reactive Power and Voltage Optimization Method for Coordination of Transmission and Distribution

Abstract

The invention proposes a distributed reactive voltage optimization method for transmission and distribution coordination, which belongs to the technical field of power system operation and control. This method comprehensively considers the coupling relationship between transmission network model, distribution network model and transmission and distribution, and constructs a joint reactive power optimization model of transmission and distribution composed of objective functions and constraints; The cone is relaxed to convert it into a convex constraint; the proposed model is solved by applying an improved generalized Benders decomposition method. The method proposed in the present invention only needs to exchange a small amount of information between the transmission network and the distribution network, and has a good convergence speed; ensures the independence of transmission and distribution scheduling and control, and solves the problems caused by the traditional transmission and distribution independent reactive power optimization method Overvoltage, power mismatch and other problems, to achieve the optimal global network loss.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, and in particular relates to a distributed reactive voltage optimization method for coordination of transmission and distribution. Background technique [0002] With the large-scale access of distributed renewable energy such as wind power and photovoltaics, the traditional distribution network is developing into an active distribution network. In the active distribution network, distributed renewable energy access is large, and its power generation changes rapidly with time and has strong randomness. In the traditional reactive power and voltage optimization problem, the transmission network and the distribution network are independently optimized. The distribution network is equivalent to a load node in the transmission network, and the transmission network is equivalent to a generator balance node in the distribution network. [0003] However, in the active distribu...

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Problems solved by technology

[0003] However, in the active distribution network, this method has obvious defects, which are mainly reflected in the following three points: 1. A large number of distributed energy sources lead to strong randomness in the distribution network, tight coupling between the distribution network and the transmission network, independent reactive power and voltage The control mode will lead to a large power mismatch at the transmission and distribution boundary; 2. Due to the excessive injection of distributed energy in the distribution network, overvoltage problems are likely to occur at the injection nodes, and the distribution network needs the power of the transmission network. Assist to eliminate overvoltage problems; 3. For the global power grid, independent reactive power regulation lacks coordination between transmission and distribution networks, and cannot guarantee the optimality of the global economic goals

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