A power supply system according to one embodiment has a plurality of power conversion devices, an acquisition unit, and a search instruction generation unit. The power conversion devices convert power generated by a power generation device into another type of power. The acquisition unit acquires information pertaining to the power outputted by the plurality of conversion devices. The search instruction generation unit refers to the information acquired by the acquisition unit, generates an operating point search instruction, and outputs the same to a power conversion device among the plurality of power conversion devices that exhibits a ratio of output power to reference power that is lower than that of the other power conversion devices by a prescribed amount or more. The reference power is set for each power conversion device on the basis of the maximum output power or the rated power of the corresponding power generation device, or on the basis of the maximum output power or the rated power of the power conversion device itself.

Power supply system

Disclosed and described herein are embodiments of systems, methods and computer program for scheduling demand events over a time period based on differences between the estimated power availability and the estimated power consumption at various points during the time period. In one aspect, methods are described. One embodiment of a method comprises establishing a defined time period, estimating power availability over the time period, estimating power consumption over the time period, and scheduling, using a computing device, demand events over the time period based on differences between the estimated power availability and the estimated power consumption at various points during the time period.

Method, system and computer program product for scheduling demand events

A technique with which a change in power frequency can be suppressed. A power system stabilizer issues a control command to a first storage battery among a plurality of first power generators and the first storage battery that are connected to an isolated island system via a first tie-line. The power system stabilizer includes a parameter determination unit and a control block unit. The parameter determination unit obtains, on the basis of operation information, a rate-of-change limit value that indicates a limit to be imposed on a total value of changes in the overall output of first power generators in operation. The control block unit generates a command value to be given to the first storage battery on the basis of an interconnection point power flow value measured on the first tie-line and the rate-of-change limit value obtained by the parameter determination unit.

System stabilization device

The present invention relates to a system for controlling microgrid facilities. In particular, the microgrid control system provided is capable of controlling multiple facilities according to characteristics of the facilities in order to achieve economic efficiency, environmental friendliness, and continued operability. The microgrid control system for controlling the operations of the multiple power facilities is provided with: a power supply activation/suspension planning unit that has a prediction unit for predicting outputs or loads of power supply facilities or load facilities and a prediction unit for predicting prediction errors contained therein; and an economical load allocation unit that determines command values related to the distribution of loads to be borne by currently running power supply facilities.

Microgrid control system

PROBLEM TO BE SOLVED: To provide a photosensitive paste composition which is inexpensive and capable of forming a thin-film, low-resistivity, and high-definition pattern on a glass substrate. SOLUTION: In this photosensitive paste composition and the pattern forming method using this composition, the photosensitive paste composition contains (A1) flake shaped aluminum powders within a range in which a 50 wt.%-particle diameter is 2.0-20.0 μm and the average thickness is 0.1-1.0 μm, (C) an alkaline soluble resin, (D) polyfunctional (meth)acrylate, and (E) a photo-polymerization initiator. COPYRIGHT: (C)2010,JPO&INPIT

Photosensitive paste composition and pattern forming method

PROBLEM TO BE SOLVED: To provide a supply and demand technique of a micro-grid, which is capable of improving the stability in frequency of the micro-grid in a power unserved area or an isolated island. SOLUTION: The micro-grid 100 connects a recycle energy utilizing power generating facility 150, and an internal combustion power generating facility 130 for compensating the facility 150 and a power storage device 140 to a power transmission network 110 and supplies power to a load 120. The micro-grid executes power supply and demand control while maintaining a stable system frequency f by adding control using the system frequency f by a load frequency control unit 240 and an interlinking line flow ΔP T to the control of an internal combustion power generator output 231 and a storage battery output 232 by a predictive function unit 210, a supply and demand scheduling unit 220 and an economic load distribution control unit 230. COPYRIGHT: (C)2011,JPO&INPIT

Apparatus and method for controlling supply and demand of micro-grid

PROBLEM TO BE SOLVED: To optimize a power generation plan of a generator and an operation plan of a secondary battery. SOLUTION: A supply power calculation unit 13 estimates power to be supplied by the generator in an internal combustion power generation facility and the secondary battery. A supply power plan calculation unit 14 inputs the supply power estimation value and generates a power generation schedule of the generator and a charging/discharging schedule of the secondary battery. The schedules satisfy various constraints on the generator and various constraints on the secondary battery, and can take demand and supply balance of power. The schedule whose evaluation by an objective function is the highest, namely, the schedule whose power generation cost is the lowest is decided. COPYRIGHT: (C)2011,JPO&INPIT

Power supply planning system, and program of the same

PROBLEM TO BE SOLVED: To make out a specific power generation plan in view of the uncertainty of generated power and the operation cost of power generation facilities other than a power generation facility utilizing recyclable energy when the power generation facility utilizing recyclable energy is linked to a power system. SOLUTION: A power generation plan making method is provided. According to the method, an error between an estimation of load power (step S1) and an estimation of power generated by power generation utilizing recyclable energy (step S2) is calculated (step S3). Based on this estimated error, a supply power scenario is made (step S4), and a cost preferential power generation plan and a supply/demand balance preferential power generation plan are made (steps S5 and S6). Hence a final power generation plan is output (step S7). COPYRIGHT: (C)2011,JPO&INPIT

Power generation plan making method and power generation plan making system

PROBLEM TO BE SOLVED: To automatically extract past similar power load data, and estimate a power load with high accuracy. SOLUTION: A maximum/minimum power estimation processing unit 11 estimates maximum/minimum values of the power load of an objective day of estimation. A one minute value extraction processing unit 12 obtains the past day which is the most similar to the objective day of estimation by using estimation results. Then, power load data (actual result data) of the past similar day is obtained. COPYRIGHT: (C)2011,JPO&INPIT

Power demand estimation device, and program of the same

PROBLEM TO BE SOLVED: To provide an economical load distribution device capable of more economical operation, and an economical load distribution method. SOLUTION: An economical load distribution control part inputs a demand prediction value of power on and after the present time, a parameter value of fuel costs characteristic of each generator, and parameter values such as upper/lower limit values of outputs, and determines whether there occurs imbalance between supply and demand by using a practicable region operation part. When there occurs the imbalance between supply and demand, a reserve power securing part issues an alarm to an administrator, and makes the administrator input a reserve power. When there occurs no imbalance between supply and demand, an optimization part operates a distribution value of output power at which fuel costs become minimum within a range of various limit conditions, and outputs a control signal of the output power to each generator and a power storage device via a distribution value output part. COPYRIGHT: (C)2011,JPO&INPIT

秀之伊藤

Papers

Apparatus and method for controlling supply and demand of micro-grid

Power supply planning system, and program of the same

Power generation plan making method and power generation plan making system

Power demand estimation device, and program of the same

Economical load distribution control device and economical load distribution control method

秀之 伊藤

Papers

Apparatus and method for controlling supply and demand of micro-grid

Power supply planning system, and program of the same

Power generation plan making method and power generation plan making system

Power demand estimation device, and program of the same

Economical load distribution control device and economical load distribution control method

秀之伊藤