×

System for regulating the active power transferred into and out of direct voltage network by multiple power stations

  • US 5,867,375 A
  • Filed: 10/15/1997
  • Issued: 02/02/1999
  • Est. Priority Date: 03/24/1997
  • Status: Expired due to Fees
First Claim
Patent Images

1. A system for transmitting power comprising:

  • a direct voltage network;

    at least two alternating voltage networks;

    a first power station connecting one of said alternating voltage networks to said direct voltage network including;

    (i) a VSC converter for bi-directionally transferring power between said direct voltage network and one of said alternating voltage networks,(ii) control means for selectively controlling said VSC converter so that either a constant value of direct voltage is maintained on said direct voltage network, or a constant current is maintained between said alternating voltage network and said direct voltage network,(iii) means for comparing the voltage on said direct voltage network with a nominal value, and for controlling said VSC converter to maintain said voltage on said direct voltage network at said nominal value, and(iv) means for switching said means for controlling into a current controlling mode if said VSC converter fails to restore said direct voltage network to said nominal value of direct voltage,a second power station connecting said direct voltage network to a remaining of said alternating voltage networks including,(i) a VSC converter for bi-directionally transferring power between said direct voltage network and said remaining alternating voltage network,(ii) means for comparing said direct voltage on said direct voltage network to a nominal voltage value,(iii) control means for selectively controlling said second power station VSC converter so that either a constant value of direct voltage is maintained on said direct voltage network, or a constant current is maintained between said direct voltage network and said remaining alternating voltage network; and

    (iv) switching means connected to said means for selectively controlling said second power station VSC converter for switching said VSC converter from a current controlling mode to a voltage controlling mode when said means for comparing indicates that said first power station has failed to maintain said direct voltage at said nominal voltage value.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×