US 6,188,205 B1 · Power system control apparatus and power system control method

Abstract

A desired value of reactive power flow between a to-be-controlled power system and an adjoining power system is determined according to measured values of the reactive power flow and an effective power flow and desired voltage values of the to-be-controlled power system and of the adjoining power system. Thereafter, a required value of a reactive power of the to-be-controlled power system is calculated according to the desired value of the reactive power flow, the measured values of the reactive power flow and the effective power flow, and the desired voltage value and a measured voltage value in the to-be-controlled power system. Thereafter, a control apparatus having an electric capacity near to the required value of the reactive power is selected from control apparatus arranged in the to-be-controlled power system to make the selected control apparatus adjust a voltage of the to-be-controlled power system. Therefore, cooperation of the to-be-controlled power system with the adjoining power system can be performed by collecting locally-existing-information, and a voltage fluctuation and/or a reactive power fluctuation in the to-be-controlled power system can be immediately suppressed.

Claims15

Dependent claims

A power system control apparatus comprising:

power flow measuring means for measuring a reactive power flow and an effective power flow, which respectively flow between a to-be-controlled power system and an adjoining power system adjacent to the to-be-controlled power system, for each adjoining power system;
desired value determining means for determining a desired reactive power flow or a desired sum of the reactive power flows according to the reactive power flows and the effective power flows measured by the power flow measuring means, a desired voltage of the to-be-controlled power system, and at least one of a plurality of desired voltages of the adjoining power systems;
required value calculating means for calculating a required reactive power of the to-be-controlled power system according to the reactive power flows and the effective power flow measured by the power flow measuring means, the desired reactive power flow or the desired sum of the reactive power flows determined by the desired value determining means, the desired voltage of the to-be-controlled power system, and a measured voltage of the to-be-controlled be-controlled power system;
and
control means for selecting a control apparatus from a plurality of control apparatuses arranged in the to-be-controlled power system according to the reactive power calculated by the required value calculating means and controlling operation of the control apparatus selected to reduce the required reactive power of the to-be-controlled power system.

2 more elements

A power system control apparatus comprising:

power flow measuring means for measuring a reactive power flow and an effective power flow flowing between each of partial power systems of a to-be-controlled power system and an adjoining power system and measuring reactive power flow and effective power flow flowing between one pair of partial power systems adjacent to each other for each pair of partial power systems adjacent to each other;
desired value determining means for determining a desired value of the reactive power flowing between one partial power system and the adjoining power system adjacent to the partial power system according to the reactive power flow and the effective power flow, which flow between the partial power system and the adjoining power system, measured by the power flow measuring means, a desired voltage of the partial power system, a desired voltage of the adjoining power system for each partial power system, a desired value of the reactive power flow flowing between one pair of partial power systems adjacent to each other according to the reactive power flow and the effective power flow, which flow between the pair of partial power systems, measured by the power flow measuring means, and two desired voltages of the pair of partial power systems for each pair of partial power systems adjacent to each other;
required value calculating means for calculating a required reactive power of each partial power system according to the reactive power flow and the effective power flow which flow between the partial power system and one adjoining power system adjacent to the partial power system, measured by the power flow measuring means, the reactive power flow and the effective power flow which flow between the partial power system and another partial power system adjacent to the partial power system, measured by the power flow measuring means, the desired reactive power flow which flows between the partial power system and the adjoining power system, and the desired reactive power flow which flows between the partial power system and another partial power system adjacent to the partial power system, determined by the desired value determining means, the desired voltage of the partial power system, and a measured voltage of the partial power system;
and
control means for selecting a control apparatus from a plurality of control apparatuses arranged in one partial power system according to the required reactive power of the partial power system calculated by the required value calculating means for each partial power system and controlling the control apparatus selected, of each partial power system to make the control apparatus selected reduce the required reactive power of the partial power system.

2 more elements

A power system control apparatus comprising:

system predicting means for receiving a load prediction of a to-be-controlled power system and at least one of a plurality of adjoining power system adjacent to the to-be-controlled power system, predicting first electric information of the to-be-controlled power system and second electric information between the to-be-controlled power system and each adjoining power system by calculating a power flow between the to-be-controlled power system and each adjoining power system according to the load prediction;
operation predicting means for predicting operation of each of at least one of a plurality of control apparatuses arranged in the to-be-controlled power system according to the first electric information and the second electric information predicted by the system predicting means;
and
schedule setting means for setting an operation schedule of the control apparatuses according to the operation prediction produced by the operation predicting means to operate the control apparatuses according to the operation schedule.

1 more element

A power system control method comprising:

measuring a reactive power flow and an effective power flow flowing between each of partial power systems of a to-be-controlled power system and an adjoining power system adjacent to the partial power system;
measuring a reactive power flow and an effective power flow flowing between one pair of partial power systems adjacent to each other for each pair of partial power systems adjacent to each other;
determining a desired reactive power flow flowing between one partial power system and the adjoining power system adjacent to the partial power system according to the reactive power flow measured and the effective power flow measured flowing between the partial power system and the adjoining power system, a desired voltage of the partial power systems, and a desired voltage of the adjoining power system for each partial power system;
determining a desired reactive power flow flowing between one pair of partial power systems adjacent to each other according to the reactive power flow measured and the effective power flow measured as flowing between the pair of partial power systems, and two desired voltages of the pair of partial power systems for each pair of partial power systems adjacent to each other;
calculating a required reactive power of each partial power system according to the reactive power flow measured and the effective power flow measured as flowing between the partial power system and one adjoining power system, the reactive power flow measured and the effective power measured as flow flowing between the partial power system and another partial power system adjacent to the partial power system, the desired reactive power flow flowing between the partial power system and the adjoining power system, the desired reactive power flow flowing between the partial power system and another partial power system adjacent to the partial power system, the desired voltage of the partial power system, and a measured voltage of the partial power system;
selecting a control apparatus from a plurality of control apparatuses arranged in one partial power system according to the required reactive power of the partial power system for each partial power system;
and
controlling operation of the control apparatus of each partial power system selected to reduce the required reactive power of the partial power system.

5 more elements

Dependencies are inferred from the claim text.

Power system control apparatus and power system control method

Life of this patent

Power system control apparatus and power system control method

Life of this patent

Abstract

Claims15