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

A safety-constrained and economic dispatching technology, applied in the field of safety-constrained economic dispatch with embedded reactive power and voltage, can solve problems such as difficulty in application, unguaranteed convergence of the interior point method, and large errors

Active Publication Date: 2019-08-16
TSINGHUA UNIV
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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

Method used

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

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Embodiment Construction

[0082] A safety-constrained economic scheduling method with embedded reactive power and voltage proposed by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0083] A security-constrained economic scheduling method with embedded reactive power and voltage proposed by the present invention, its core is to use the successive linear method to solve the optimal power flow model, and the first iteration can construct the power flow equation constraint by cold start or hot start, and obtain the corresponding Optimal power flow model; in each subsequent iteration, the constraints of the power flow equation are updated based on the optimal solution of the last iteration, which further improves the accuracy of the model. This method takes the error of the linear approximation power flow equation as the convergence criterion: if the optimal solution satisfies the convergence criterion, the accuracy of...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/46H02J3/16
CPCH02J3/16H02J3/46H02J2203/20H02J3/466H02J2203/10Y02E40/30Y04S40/20Y04S10/50Y02E40/70Y02E60/00G05B2219/2639
Inventor 杨知方钟海旺夏清陆春凌赖晓文汪洋
Owner TSINGHUA UNIV
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