Micro-grid probability load flow calculation method

• Main Authors: LIU XIANGQIANG, WANG CHAOSHUO, LIU MINGBO, DONG PING, ZHAO JIANNING, JIAN GANYANG, TIAN YINGFU
• Format: Patent
• Language: Chinese; English
• Published: 02.01.2013
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention provides a method for implementation of micro-grid probability load flow analysis. The method includes the steps: numbering each node in a micro-grid, and forming a node admittance matrix according to micro-grid system data; working out semi-invariants of each stage of injection power according to probability distribution of each node injection power; aiming at uncertainty node injection powers, using the statistic method to obtain a mean value of micro-grid load flow and obtain a Jacobi matrix mean value of the last iteration; obtaining semi-invariants of each stage of system state variables according to the semi-invariants of each stage of each node injection power and the Jacobi matrix mean value of the last iteration; working out each coefficient of Gram-Charlier stages corresponding to a probability distribution function according to the semi-invariants of each stage of system state variables; approximately representing state variable probability distribution by means of Gram-Charlier stage