Unlock instant, AI-driven research and patent intelligence for your innovation.

A dynamic equivalence method for hydropower clusters with generalization ability

A dynamic equivalent, hydropower technology, applied in the field of value, can solve the problem of incalculable errors, and achieve the effect of strong interpretability

Active Publication Date: 2018-09-11
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +2
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the response curve of an unknown disturbance is to be obtained in the simulation calculation of the power system, no matter which parameter is selected for the equivalent model obtained by any known disturbance, there is no basis, and the error cannot be estimated

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A dynamic equivalence method for hydropower clusters with generalization ability
  • A dynamic equivalence method for hydropower clusters with generalization ability
  • A dynamic equivalence method for hydropower clusters with generalization ability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 1 as shown, figure 1 For the general flowchart of the method of the present invention, comprise the following steps:

[0038] 1) Establish a dynamic equivalent model of hydropower clusters;

[0039] 2) Equivalent the hydropower cluster dynamic equivalent model for the measurement data under different disturbances, and use the particle swarm optimization algorithm to identify the parameters of the equivalent model under each disturbance according to the response curve;

[0040] 3) Apply the PCA method in statistics to preprocess the parameters of the dynamic equivalent model, reduce the parameter dimension, and form the initialization data for establishing the generalized equivalent model;

[0041] 4) Using the support vector machine as a tool, establish the characteristic sample space of dynamic equivalent model parameters;

[0042] 5) Carry out multi-curve fitting parameter identification on the support vector of the feature sample space, and establis...

Embodiment 2

[0044] As a specific way of implementing step 1), the dynamic equivalent model established is to establish an equivalent generator model and an equivalent load model, including a third-order generator model and a static load model. The third-order generator model equations are as follows:

[0045]

[0046] E' q is the q-axis transient electromotive force; E f0 is the initial value of excitation voltage; K v is the voltage feedback coefficient; x’ d with x d Respectively d-axis transient reactance and synchronous reactance; x q is the q-axis synchronous reactance; T’ d0 is the d-axis transient open-circuit time constant; T J is the inertial time constant; D is the damping coefficient; δ is the q-axis potential E q Angle with the terminal voltage; ω is the rotor speed; T m is the mechanical torque; u is the generator terminal voltage; i d with i q , u dwith u q are the current and voltage components of the d-axis and q-axis respectively; E f is the stator excitat...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a hydropower cluster dynamic equivalence method with generalization. The method comprises establishing a hydropower cluster dynamic equivalence model; identifying parameters of the equivalence model under various disturbances; forming initialized data for establishing generalization equivalence model; establishing a characteristic sample space for parameters of the dynamic equivalence model; and establishing a dynamic equivalence model with generalization and parameters. According to the invention, the hydropower cluster dynamic equivalence method has good generalization, and makes up the deficiency that an equivalence model and parameters can only accurately describe a particular disturbance when a general estimate equivalence method is used for dynamic equivalence for a power system at present.

Description

technical field [0001] The invention belongs to the field of electric power system simulation, and in particular relates to a hydropower group dynamic equivalent method with generalization capability. Background technique [0002] Generally, there is only one area that is interested in the dynamic research of large-scale power systems, which is called the research system; and for the area far away from this area, only its influence on the research area is considered in the study without describing its internal structure in detail. , called the outer region. During the research, the external system is often dynamically equivalent to significantly reduce the amount of calculation and highlight the main features. At present, dynamic equivalence methods can be divided into three categories: coherent equivalence method, model equivalence method and estimated equivalence method. The basic idea of ​​the estimated equivalent method is to regard the external system as a "black box"...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/04G06Q50/06
Inventor 史华勃王晓茹李甘胡柏玮汤凡王彪丁理杰
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST