A Security Constrained Economic Dispatch Method with Embedded Reactive Power and Voltage

Abstract

The invention proposes a safety-constrained economic dispatching method with embedded reactive power and voltage, which belongs to the field of electric power system safety-constrained economic dispatching, so that each node and line flow in the power grid is within the safety-constrained range, and the power grid operation cost is minimized. This method first constructs the optimal power flow model of safety-constrained economic dispatch composed of objective functions and constraints; after solving the model iteratively, check the per-unit error for all branches: if there is a line that does not meet the per-unit error, then Update the constraints of the power flow equation, and proceed to the next iteration until all lines meet the per unit error, the model converges, and the iteration ends. A complete set of power system security including node voltage amplitude, voltage phase angle, unit active output, and reactive output is obtained. Constrained economic dispatch schemes. The invention can meet the requirements of economical operation of the power system to the greatest extent, reduce the operating cost of the power system, has high precision, good convergence, and has strong 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 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 network model ignores reactive power and network lo...

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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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