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

Single machine equivalent method for new energy stations

An equivalent method, a new energy technology, applied in the field of value, which can solve problems such as the inability to balance calculation volume and accuracy

Active Publication Date: 2019-03-29
HARBIN INST OF TECH
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention aims to solve the problem that the calculation amount and accuracy of the traditional stand-alone equivalent method of the new energy station cannot be balanced

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
  • Single machine equivalent method for new energy stations
  • Single machine equivalent method for new energy stations
  • Single machine equivalent method for new energy stations

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0058] Preferred implementation mode: Step 3 also includes: arranging all new energy units in ascending order according to their steady-state active power 1 ≤P 2 ≤…≤P n , to get the sequence t of all units reaching their respective steady-state moments after the fault is cleared 1 ≤t 2 ≤…≤t n .

[0059] The effect of this embodiment is: the sorting of the steady-state moments entered by all generating units after the fault is cleared is obtained by sorting in ascending order according to the steady-state active power of the generating units.

Embodiment

[0061] The practical stand-alone equivalent method of a new energy station, taking a wind farm as an example, the method includes the following steps:

[0062] Step 1. Equivalent all wind turbines in the wind farm to one unit to obtain a single-unit equivalent system, and run the single-unit equivalent system until t 0 moment, t 0 Indicates the moment when a three-phase short-circuit fault occurs at the grid-connected point of the wind farm;

[0063] Step 2. Correction of steady-state active power during a fault: the stand-alone equivalent system starts from t 0 continue running until t c moment, t 0 time to t c The moment is the fault period, during which the active power control channel of the single-machine equivalent system should be corrected according to the steady-state active power during the detailed wind farm fault period at t 0 ~t c The reference value of the active power at the corresponding moment in the time period:

[0064] The steady-state active power d...

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 relates to a practical single-unit equivalent method for a new energy station and belongs to the power system simulation modeling technical field. The invention aims to solve the problem of the incapability of a traditional single-unit equivalent method for a new energy station to balance computational quantity and precision. According to the method of the invention, all new energy units in the new energy station are equivalent to one unit, so that a single-unit equivalent system is obtained, and the single-unit equivalent system operates until a fault occurrence time point t0; and the active power of the new energy station in the duration of a fault is adopted to replace the reference value of the active power of the active power control channel of the single-unit equivalent system at corresponding time points from t0 to tc, and the single-unit equivalent system further operates until a fault clearing time point tc; and the active power of the new energy station after the fault is cleared is adopted to replace the active power reference value of the active power control channel of the single-unit equivalent system after the fault is cleared until the single-unit equivalent system operates to a steady-state time point tn. With the method adopted, the equivalent error of the single-unit equivalent model of the new energy station during the fault and after the fault is cleared.

Description

technical field [0001] The invention relates to a practical stand-alone equivalent method for new energy stations, and belongs to the technical field of power system simulation modeling. Background technique [0002] With the continuous increase of the grid-connected scale of new energy stations represented by photovoltaic power stations and wind farms, it is increasingly important to correctly evaluate their impact on the power system. However, a large-scale wind farm and photovoltaic power station often contains dozens or even hundreds of units. If each unit is modeled separately, the complexity of the power system simulation model and the simulation calculation time will be greatly increased. Therefore, the research on practical equivalent modeling of new energy stations is becoming increasingly important and urgent. [0003] At present, the equivalent methods of new energy stations can be divided into two types: single-machine equivalent and multi-machine equivalent. M...

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): G05B23/02
CPCG05B23/0235
Inventor 李卫星晁璞璞齐金玲樊世超常学飞
Owner HARBIN INST OF TECH