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This new solving method is not featured in minimum variables however it is featured as a one-time simultaneous solution. Through the IEEE 5 bus system, the analyzing cases of total differential sensitivity and operation under conditions of constant line power and constant node voltage were carried out, these cases described the fact that the mixed variable solving method of power flow regulation has a simple form, small calculation volume and efficiency. | Send Orders for Reprints to reprints@benthamscience.ae The Open Electrical Electronic Engineering Journal 2015 9 91-98 91 Open Access A Modular Approach to Power Flow Regulation Solution Yang Liu-Lin1 l Hang Nai-Shan1 and Liu Bai-Jiang2 College of Electrical Engineering Guangxi University Nanning Guangxi Zhuang Autonomous Region 530004 China 2Honghu Water Resources Hydropower Science Technology Co. Ltd. of GuangXi University Nanning 530023 China Abstract The operating modes of generations and the voltage states of power system must be solved when calculating and analyzing the power flow problem with operation demands. The generation variable differential were derived as well as the complete principle of variable differential analysis was formed based on the model of expanded power flow with constraints by using the implicit function differential method the linear composing relation between the voltage variable differential and the expanded correction equations which included the equations of PQV node and branch power solutions were also proposed. This new solving method is not featured in minimum variables however it is featured as a one-time simultaneous solution. Through the IEEE 5 bus system the analyzing cases of total differential sensitivity and operation under conditions of constant line power and constant node voltage were carried out these cases described the fact that the mixed variable solving method of power flow regulation has a simple form small calculation volume and efficiency. Keywords Power flow regulation expanded power flow PQV node constrained sensitivity optimal power flow OPF . 1. INTRODUCTION This paper revolves around the question of how to solve the operation point of the system generations according to the power grid steady-state operation requirement 1-8 based on a given load. i.e. the problem of power flow regulation or control. The power system operating level analysis problem is the continued part of the unit commitment peak-load .