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Method for calculating transient energy function of renewable energy power system

A transient energy function, renewable energy technology, applied in complex mathematical operations, photovoltaic power generation, electrical components, etc., can solve problems such as obstacles, and achieve the effect of expanding the scope of application

Inactive Publication Date: 2020-11-13
HUAZHONG UNIV OF SCI & TECH +1
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Problems solved by technology

However, the physical meaning of renewable energy equipment based on power electronics technology is not yet clear, and there is still a gap in the construction of energy functions, which directly hinders the application of direct methods to renewable energy power systems.

Method used

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  • Method for calculating transient energy function of renewable energy power system
  • Method for calculating transient energy function of renewable energy power system
  • Method for calculating transient energy function of renewable energy power system

Examples

Experimental program
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Embodiment

[0103] The three-machine nine-node standard test system is selected to analyze the three-phase short-circuit transient stability and calculate the critical fault removal time. The data of the three-machine nine-node line is shown in Table 1.

[0104]

[0105] Table 1

[0106] system such as figure 2 As shown, among them, node 1 is connected to the infinite power grid, node 2 is connected to the synchronous generator, and node 3 is connected to the renewable energy equipment. The parameters used in this embodiment are expressed in per unit system, and the reference value of power is S base =100MVA, see Table 1 for line parameters. Synchronous generator parameters are: M=7.4p.u., D=10p.u. The phase-locked loop parameters of renewable energy equipment are: k pi = 10 p.u., k ii = 100 p.u. The power flow in stable operation is: 2 nodes are PV nodes, output power is 1.63p.u., voltage amplitude is 1.025p.u., 3 nodes are PV nodes, output power is 0.85p.u., voltage amplitude ...

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Abstract

The invention discloses a method for calculating a transient energy function of a renewable energy power system, and belongs to the field of transient stability analysis of power systems. The method comprises the steps of firstly, establishing a mathematical model of a to-be-analyzed power system, eliminating intermediate nodes, and only reserving renewable energy equipment nodes, synchronous generator nodes and power load nodes; representing the transient process of the renewable energy equipment by a second-order phase-locked loop equation, representing the transient process of the synchronous generator equipment by a second-order swing equation, respectively listing and writing energy functions of all renewable energy equipment, the synchronous generator equipment, the power network andall power loads, and adding all the energy functions to obtain a transient energy function of the power system. Compared with the prior art, the method considers the transient energy function of thepower system when the renewable energy equipment and the synchronous generator are connected to the power grid at the same time, can analyze the transient stability of the system including the synchronous generator equipment and the renewable energy equipment, and expands the application range of the energy function direct method.

Description

technical field [0001] The invention belongs to the field of power system transient stability analysis, and more specifically relates to a calculation method of a transient energy function of a renewable energy power system. Background technique [0002] With the reform of the country's energy system, the proportion of renewable energy equipment based on power electronic converter technology such as wind power generation and photovoltaic power generation in the power system is increasing. The power system is changing from a power system dependent on fossil energy to a new generation power system with a high proportion of renewable energy. While renewable energy equipment brings high efficiency to the power system, it also poses a huge challenge to the safe and stable operation of the power system due to its complexity. [0003] Common wind turbine generators can be divided into direct-drive wind turbines and doubly-fed wind turbines. The common grid-connected equipment for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38G06F17/15
CPCG06F17/15H02J3/381H02J2203/20H02J2300/24H02J2300/28Y02E10/56
Inventor 杨子千占萌马锐余佳微王衡
Owner HUAZHONG UNIV OF SCI & TECH
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