Method and apparatus for direct control of the inter-area dynamics in large electric power systems

In a method for controlling the net power flow in an electrical power system which includes a plurality of areas with generators and loads, the areas being electrically connected by tie lines, the improvement comprising:

• measuring a real power output of each generator in a first area, and generating a measurement signal indicative thereof;
• deriving, in response to the measurement signal, a net power flow from the first area to the remainder of the system along the tie lines, and generating a derivation signal indicative thereof;
• and
• dynamically controlling, in response to the derivation signal, the actual net power flow from the first area to the remainder of the system along the tie lines by directly and dynamically controlling the actual net power flow on at least one tie line from the first area, and determining locations in the system at which the dynamic control is applied.

In an electrical power system which includes a plurality of areas with generators and loads, the areas being electrically connected by tie lines, and the generators and loads within a given area being electrically connected by a network, the improvement comprising:

• means for measuring a real power output of each generator in a first area, and generating a measurement signal indicative thereof;
• a computer, which receives the measurement signal, and derives a net power flow from the first area to the remainder of the system along the tie lines and which derived net power flow accounts for transmission losses within a network of the first area and determines a weighted sum of the real power outputs from the generators in the first area which are weighted with respect to the electrical distance of each generator from a location on the tie line where control is applied, the computer generating a derivation signal indicative thereof;
• and
• means, responsive to the derivation signal and connected to at least one tie line from the first area, for directly and dynamically controlling the actual net power flow from the first area to the remainder of the system along the tie lines.

In a method of controlling the net power flow in an electrical power system which includes a plurality of areas with generators and loads, the areas being electrically connected by tie lines, and the generators and loads within a given area being electrically connected by a network, the improvement comprising:

• measuring a real power output of each generator in a first area, and generating a measurement signal indicative thereof;
• deriving, in response to the measurement signal, a net power flow from the first area to the remainder of the system along the tie lines, and which derived net power flow accounts for transmission losses within a network of the first area and determines a weighted sum of the real power outputs from the generators in the first area which are weighted with respect to the electrical distance of each generator from a location on the tie line where the control is applied, and generating a derivation signal indicative thereof;
• and
• dynamically controlling, in response to the derivation signal, the actual net power flow from the first area to the remainder of the system along the tie lines by directly and dynamically controlling the actual net power flow on at least one tie line from the first area.