Abstract: A voltage control apparatus includes: a voltage value obtainment unit configured to obtain voltage values at the one or more voltage measuring points; an impedance obtainment unit configured to obtain a system impedance from a distribution substation to each of power adjustment apparatuses; a control variable calculating unit configured to calculate a control variable including at least one of (i) a value corresponding to an allowable upper limit of a voltage value at the first voltage measuring point and (ii) a value corresponding to an allowable lower limit of the voltage value at the first voltage measuring point, based on the voltage values at the one or more voltage measuring points and the system impedances; and a notification unit configured to notify the power adjustment apparatuses of the calculated control variable.

Abstract: A voltage control apparatus includes: an obtaining unit which obtains voltage values at voltage measuring points; a detecting unit which detects a system impedance value; a control quantity calculating unit which calculates, as control quantity, a reactive power value to be output by a power regulating apparatus to prevent at least a voltage value deviating from a predetermined voltage range from deviating from a target voltage value; and a notifying unit which notifies the power regulating apparatus of the control quantity. The control quantity calculating unit calculates the control quantity such that the voltage value at a specific voltage measuring point is substantially equal to the target voltage value, and when all of the voltage values deviating from the target voltage value deviate from the target voltage value in a same direction, only positive or negative reactive power is output by power regulating apparatuses.

Abstract: A voltage control apparatus includes: a voltage value obtainment unit configured to obtain voltage values at the one or more voltage measuring points; an impedance obtainment unit configured to obtain a system impedance from a distribution substation to each of power adjustment apparatuses; a control variable calculating unit configured to calculate a control variable including at least one of (i) a value corresponding to an allowable upper limit of a voltage value at the first voltage measuring point and (ii) a value corresponding to an allowable lower limit of the voltage value at the first voltage measuring point, based on the voltage values at the one or more voltage measuring points and the system impedances; and a notification unit configured to notify the power adjustment apparatuses of the calculated control variable.

Abstract: A detergent composition for removing resinous stains including (a) an aromatic compound represented by the general formula (1); and (b) an alkylene oxide compound represented by the general formula (2); and optionally including (c) an alkali metal hydroxide; and (d) water.