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1. 发明专利

JP2002027765A METHOD FOR CONTROLLING VOLTAGE AT SUBSTATION FACILITY AND CONTROL SYSTEM 失效
公开(公告)号：JP2002027765A
公开(公告)日：2002-01-25
申请号：JP2001168905
申请日：2001-06-04
申请人： ABB AB
发明人： JIANG-HAFNER YING
IPC分类号： H02J1/00 , H02J3/36 , H02M7/757 , H02M7/48
摘要： PROBLEM TO BE SOLVED: To provide a simple, satisfactory method capable of maintaining the voltage of DC links within a safety operation limit even under an abnormal state and a control system for performing the method. SOLUTION: Converting facilities (STN1, STN2) having voltage-converting devices (CON1, CON2) are provided between DC links (W1, W2) and AC networks (N1, N2) of a high voltage DC transmitting system. Control systems (CTRL1, CTRL2) of the converting facilities have means for controlling a dynamic electric power flow (P) between the DC links and the AC networks by having an effect on phase difference (γ) between the bus voltages (UL1, UL2, UL) of the AC networks and the bridge voltages (UV1, UV2, UV) of the voltage- converting devices. The control systems have a detecting means (48) that generates a phase change command signal (PCO) based on an abnormal voltage state index at the DC links, and a control means (49) that has effect on the phase of the bridge voltages based on the phase change command signal and control, in such a way that the phase difference between the bridge voltages and the bus ones becomes the electric power flow from the DC links to the AC networks.

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