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US 2026/0259251 A1Published application
Active power metering device, adjustment power metering device, metering method, and program
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsTakaharu Hiroe, Kazunari Ide, Ryo Sase
Life of this patent
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Abstract
An active power metering device includes: a frequency estimator configure to estimate a cycle and a frequency of an alternating current based on a time series of a voltage of the alternating current transmitted to or received from a power system by a target device; and an active power meter configured to calculate a moving average value of instantaneous power in a plurality of cycles of the alternating current for each cycle of the alternating current, and meter active power exchanged by the target device in a cycle of the alternating current from a difference between the calculated moving average value and a previously calculated moving average value.
Claims13
An active power metering device comprising:
- a frequency estimator configured to estimate a cycle and a frequency of an alternating current transmitted to or received from a power system by a target device based on a time series of a voltage of the alternating current;
- and
- an active power meter configured to calculate a moving average value of instantaneous power in a plurality of cycles of the alternating current for each cycle of the alternating current, and meter active power exchanged by the target device in one cycle of the alternating current from a difference between the calculated moving average value and a previously calculated moving average value.
An active power metering device comprising:
- a frequency estimator configured to estimate a cycle and a frequency of an alternating current transmitted to or received from a power system by a target device based on a time series of a voltage of the alternating current;
- and
- an active power meter configured to meter active power exchanged by the target device from an integrated value of instantaneous power in one cycle of the alternating current.
An active power metering device comprising:
- a frequency estimator configured to estimate a cycle and a frequency of an alternating current transmitted to or received from a power system by a target device based on a time series of a voltage of the alternating current;
- and
- an active power meter including an instantaneous power calculator configured to calculate instantaneous power of the alternating current at a frequency that is an integral multiple of the frequency of the alternating current, and output a discrete time signal of the instantaneous power in one cycle of the alternating current, and a finite impulse response filter having a Hanning window whose tap length matches a calculation frequency of the instantaneous power as a coefficient, the active power meter being configured to filter a discrete signal of the instantaneous power with the finite impulse response filter and meter active power exchanged by the target device.
An active power metering device comprising:
- a frequency estimator configured to estimate a cycle and a frequency of an alternating current based on a time series of a voltage of the alternating current transmitted to or received from a power system by a target device;
- an instantaneous power calculator configured to calculate an instantaneous power of the alternating current at a frequency that is an integral multiple of the frequency of the alternating current, and output a discrete time signal of the instantaneous power in one cycle of the alternating current;
- and
- an active power meter configured to filter a discrete signal of the instantaneous power with a finite impulse response filter that cuts off a component corresponding to a vibration frequency of the alternating current, and meter active power exchanged by the target device.
1 more element
An active power metering device comprising:
- a frequency estimator configured to estimate a frequency of an alternating current of at least one phase of a three-phase alternating current transmitted to or received from a power system by a target device based on a time series of a voltage of the three-phase alternating current;
- and
- an active power meter configured to meter active power of all three phases of the target device from a moving average value of a sum of instantaneous power of each phase of the three-phase alternating current.
An active power metering device comprising:
- a synchronous motor model configured to receive, as an input, an instantaneous voltage of an alternating current transmitted to or received from a power system by a target device, calculate a rotation speed of a synchronous motor included in the target device, and output a frequency of the alternating current;
- and
- an active power meter configured to meter active power exchanged by the target device in one cycle of the alternating current based on an instantaneous current of the alternating current, the instantaneous voltage, and the frequency output from the synchronous motor model.
A metering method comprising:
- a step of estimating a cycle and a frequency of an alternating current based on a time series of a voltage of the alternating current transmitted to or received from a power system by a target device;
- a step of calculating instantaneous power of the alternating current at a frequency that is an integral multiple of the frequency of the alternating current, and outputting a discrete time signal of the instantaneous power in one cycle of the alternating current;
- and
- a step of metering active power exchanged by the target device by filtering a discrete signal of the instantaneous power with a finite impulse response filter having a Hanning window whose tap length matches a calculation frequency of the instantaneous power as a coefficient.
1 more element
A non-transitory computer readable media storing instructions causing an active power metering device to execute:
- a step of estimating a cycle and a frequency of an alternating current based on a time series of a voltage of the alternating current transmitted to or received from a power system by a target device;
- a step of calculating instantaneous power of the alternating current at a frequency that is an integral multiple of the frequency of the alternating current, and outputting a discrete time signal of the instantaneous power in one cycle of the alternating current;
- and
- a step of metering active power exchanged by the target device by filtering a discrete signal of the instantaneous power with a finite impulse response filter having a Hanning window whose tap length matches a calculation frequency of the instantaneous power as a coefficient.
1 more element
Dependencies are inferred from the claim text.