MMC power operation interval optimization method based on energy flow rule

An interval-optimized, energy-flowing technology used in the power field

An interval-optimized, energy-flowing technology used in the power field

CN110994660AInactive Publication Date: 2020-04-10CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
4 Cites 2 Cited by

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • MMC power operation interval optimization method based on energy flow rule
  • MMC power operation interval optimization method based on energy flow rule
  • MMC power operation interval optimization method based on energy flow rule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] The present invention will be further described below in conjunction with the drawings and specific implementation process.

[0018] see figure 1 , to analyze the fault characteristics of the AC side of the MMC-HVDC system, it is first necessary to build the MMC-HVDC simulation model in ADPSS, including the AC system interface, DC line, converter stations at both ends, converter transformer, and data conversion interface. Through the "interface variable", the control system built by the model is associated with the built primary system for simulation research of the DC transmission system, and various faults on the AC side are simulated, such as two-phase short-circuit faults, disconnection faults, single-phase ground faults, Two-phase ground faults, three-phase short-circuit faults, and impedance imbalances are used to obtain fault equivalent circuit models. At the same time, model parameters, boundary conditions, and fault duration are adjusted to fully consider vario...

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 an MMC power operation interval optimization method based on an energy flow rule, and the method can achieve the maximum power transmission of a flexible DC power transmission(MMC-HVDC) system under an AC side fault. Firstly, fault feature analysis is carried out on an alternating current side; an energy distribution condition and an instantaneous energy fluctuation characteristic under different fault types of the alternating current side are understood, a coupling relationship between an energy dynamic process and each electrical parameter of the system is constructed, and the energy conversion rule of the flexible DC power transmission system is found, so that an MMC operation power interval is optimized based on the energy conversion rule, the analytical expression of the maximum active power transmission capability of the MMC under different fault working conditions is constructed, and the optimal energy distribution of the MMC-HVDC system is determined.

Description

technical field [0001] The invention relates to maximum power transmission under AC side failure of a flexible direct current transmission (MMC-HVDC) system, in particular to an MMC power operation interval optimization method based on energy flow rules when the system AC side fails, and belongs to the field of electric power technology. Background technique [0002] Modular Multilevel Converter (MMC) high-voltage flexible DC transmission technology is a new generation of DC transmission technology with voltage source converter as the core, and it is the commanding height of power electronics technology application in the world today. [0003] The faults of the flexible HVDC transmission system include internal faults of the converter, faults on the DC side and faults on the AC side. Among them, there are many mechanisms for AC side faults. When the AC grid is asymmetrical, the current on the AC side of the MMC converter will be unbalanced, and the sum of the three-phase ins...

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
10 Apr 2020
Publication
CN110994660A
IPC
H02J3/36
CPC
H02J3/36; Y02E60/60
Inventors
夏向阳; 石超