Safety constraint economic dispatching method for embedded reactive power and voltage

Abstract

The invention provides a safety constraint economic dispatching method for embedded reactive power and voltage, and belongs to the field of electric power system safety constraint economic dispatching. According to the method, first an optimal power flow model of safety constraint economic dispatching formed by an objective function and a constraint condition is built; after the model is iteratively solved, a per unit error is checked for all branch lines; if a line exists which does not meet the per unit error, a power flow equation constraint is updated, iteration of a next time is performedtill all the lines meet the per unit error, the model converges, iteration ends, and a whole set of electric power system safety constraint economic dispatching scheme containing node voltage amplitude, a voltage phase angle, unit active power output and reactive power output is obtained. The safety constraint economic dispatching method for embedded reactive power and voltage can maximally meetelectric power system economic operation requirements, and reduce electric power system operation cost; and is high in precision, is good in convergence, and has very high practical application value.

Description

technical field [0001] The invention belongs to the field of electric power system safety-constrained economic dispatching, in particular to a safety-constrained economic dispatching method embedded with reactive power and voltage. Background technique [0002] In order to realize the safe and stable operation of the power grid, the nodes in the power grid must follow some normative systems. Safety-constrained economic dispatch is based on the control behavior of each node and line flow in the power grid within the range of safety constraints, so as to minimize the operating cost of the power grid. Security-constrained economic dispatch needs to solve the AC optimal power flow problem, and the nonlinear characteristics of the AC power flow equation involved make it a non-convex optimization problem, which is very difficult to solve. [0003] Currently, DC power flow network models that only consider active power are widely used in the power industry. The DC power flow netwo...

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Problems solved by technology

Convex relaxation includes semi-positive definite programming (Semidifinate Programming, SDP) relaxation, second-order cone programming (Second Order Cone Programming, SOCP) relaxation and quadratic programming (Quadratic Programming, QP) relaxation, but these methods bring large errors and are difficult to implement in the actual power grid. put into application; and the convergence of the interior point method cannot be guaranteed

[0005] In summary, the existing safety-constrained economic dispatch methods are difficult to ensure high calculation accuracy, high calculation efficiency and good convergence while considering reactive power and voltage

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