Distributed computation based voltage stability assessment method of sub-networks in interconnected power network

Abstract

The invention discloses a distributed computation based voltage stability assessment method of sub-networks in an interconnected power network. The distributed computation based voltage stability assessment method comprises the following steps: firstly establishing a simplified external network model which only reserves a regional interconnection line on sub-networks in the interconnected power network; then calculating load margin by a continuation power flow (CPF) method in the main sub-network performing voltage stability assessment calculation, and then calculating by a Newton load flow method under coordination of the other neighboring sub-networks; and by means of voltage information exchange and coordination calculation of boundary nodes in outer loop, continuously correcting equivalent injection power of the boundary nodes outside the sub-networks so as to finally and locally obtain the sub-network load margin which is consistent with the result of whole network unified computation at the main sub-network. The voltage stability assessment method has the beneficial effects that by adopting the simplified external network model of the sub-networks, the Ward equivalent process is avoided so as to reduce the participation degree and calculated quantity of a coordination layer; the calculation mode is basically consistent with that in the current EMS (energy management system), and the independent calculation precision of each sub-network is higher; and voltage stability support and impact of an external power network on an internal power network can be better considered.

Description

technical field [0001] The invention relates to a method for assessing the voltage stability of a subnet in an interconnected grid. Under a simplified external network model, the voltage stability of the subnet in the interconnected grid is evaluated in combination with a distributed computing method and a continuous power flow technology. Background technique [0002] Worldwide, the continuous improvement of grid interconnection has promoted the optimal allocation of power resources, but it has also brought some negative effects, making the security of the grid more prominent. More and higher requirements. In recent years, there have been many voltage collapse accidents in power systems at home and abroad, and the research on voltage stability has attracted widespread attention worldwide. The problem of medium and long-term voltage stability can be approximated by static models and methods, and the corresponding theories and algorithms have been matured. However, the inte...

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Problems solved by technology

This method has the disadvantages of large data communication volume and poor data confidentiality, which brings limitations to its application, especially in the context of electricity market

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