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A method of calculating the slope of pv curve to obtain the operating point of pv curve

A technology of curve slope and operating point, applied to AC network circuits, electrical components, circuit devices, etc., to achieve fast calculation speed, strong robustness, and good convergence

Active Publication Date: 2021-02-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0005] Aiming at the shortcomings of the existing continuous power flow method and direct method, a new calculation method for static voltage stability analysis of power systems is proposed to overcome the shortcomings of the existing methods

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  • A method of calculating the slope of pv curve to obtain the operating point of pv curve
  • A method of calculating the slope of pv curve to obtain the operating point of pv curve
  • A method of calculating the slope of pv curve to obtain the operating point of pv curve

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Embodiment Construction

[0041] This calculation example uses the IEEE118 node system for calculation, and the implementation of this method will be further described in conjunction with the system below. The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0042] Step A: Input power grid parameters, including lines, generators, transformers and related load parameters, and perform π-shaped equivalent transformation on transformer branches to form a node admittance matrix. Sort out the node types of the 118-node system: nodes with known injection of active power and voltage are PV nodes, nodes with known injection of active power and reactive power are PQ nodes, nodes with known voltage amplitude and phase angle are balance nodes node. Consider a power system with 118 nodes, including 1 balance node and m PV nodes. Parameterize the grid load and define the unbalanced quantity equation

[0043]

[0044] where P i Q i a...

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Abstract

The invention discloses a method for calculating the PV curve slope to obtain the corresponding operating point of the PV curve in the field of power system simulation calculation. Including: inputting the grid parameters to form the node admittance matrix; classifying the nodes, setting the initial value of the state variable, and obtaining the original unbalance equation; determining the load growth mode, deriving the expression of the node PV curve slope, and using this formula to The original equation is replaced, the initial value is set for the node slope, and a new equation is obtained; the mathematical method is used to solve the equation, and the specific mathematical methods include Newton's method, Gaussian method, etc. The present invention provides a method for obtaining the corresponding operating point of the PV curve by calculating the slope of the PV curve, which can accurately solve the position of any point of the PV curve, and has the advantages of good convergence, high precision, short operation time, and is suitable for the online power system. Calculate the demand for demand.

Description

technical field [0001] The invention belongs to the field of static voltage stability analysis of power systems, and in particular relates to a method for calculating the slope of a PV curve to obtain the operating point of the PV curve. Background technique [0002] The main content of studying the static voltage stability of the power system is to obtain the node PV curve through calculation, and then calculate the node voltage stability margin to obtain the data of the voltage collapse point. The dispatcher executes corresponding dispatching instructions based on this, so as to ensure the stable operation of the power system. [0003] However, when the node voltage reaches its static voltage stability limit (voltage collapse point), the Jacobian matrix used in the ordinary Newton-Raphson method power flow calculation is singular, the power flow has no convergent solution, and the system operating point is difficult to obtain. [0004] At present, there are mainly two sol...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 姜彤万凯遥冯卓诚
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)