Intelligent substation load automatically-distributing method based on distributed electric connection

Abstract

The invention relates to an intelligent substation load automatically-distributing method based on distributed electric connection. The method comprises the steps of establishing mathematic models of distributed generation, including the mathematic model of a wind generating set, the mathematic model of a photovoltaic cell and the mathematic model of a stable distributed power supply; conducting load flow calculation on a whole grid according to network and load data acquired by an intelligent substation of the current power grid to which the distributed power supply is connected, and establishing a reactive power optimization model and a network reconstitution model of the power grid to which the distributed power supply is connected when a constraint condition is given; conducting crossing iteration on two subproblems of the reactive power optimization model and the network reconstitution model of the power grid to which the distributed power supply is connected through an iteration computation module in an intelligent substation load automatically-distributing system to approach an optimal solution step by step till automatic distribution of the load of the intelligent substation of the power rid to which the distributed power supply is connected is accomplished. The method can be widely applied to automatic distribution of the load of the intelligent substation.

Description

technical field [0001] The invention relates to a load distribution method of a power system, in particular to an automatic load distribution method of an intelligent substation based on distributed power access. Background technique [0002] Automatic load distribution is based on the premise that the voltage of each node in the power system is qualified, and the ultimate goal is to minimize the network loss. The existing technology uses reactive power optimization and network reconfiguration technology to reduce the power loss of the distribution network. The reactive power optimization technology adopts the input of reactive power compensation device, the adjustment of the tap of the on-load tap changer, and the adjustment of the generator terminal voltage to achieve the purpose of reducing the reactive power loss. The reactive power optimization methods mainly include: nonlinear programming method, and linear programming. The network reconfiguration technology selects t...

AI Technical Summary

Problems solved by technology

[0003] Since the future distribution network contains a large number of distributed power grids, some distributed power sources have greater randomness and volatility. active network, and put forward new requirements for distribution network reconstruction and reactive power optimization rules, making the control and management of distribution network more complicated

The location of the distributed power supply connected to the distribution network, the difference in injected power and power factor will all affect the automatic load distribution method. With the increase of the active power injected by the distributed power supply, the active power loss of the power system will decrease and the node voltage will increase. , also affects the load distribution method

For non-dispatchable distributed power sources such as wind power and photovoltaic power generation without energy storage devices, their output power is determined by factors such as wind speed and light intensity. Allocation method is subject to change at any time

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