Power System Stabilization via Prediction Command Values

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Solution Overview

Problem

Existing power system stabilization methods face challenges in maintaining power and frequency stability due to communication delays between management devices and power supply devices, particularly when the management device needs to wait for power command values from a power control center, making front-loaded control difficult.

Innovation Solution

A power system stabilization method that involves receiving a power command value, generating a prediction command value based on past values, and transmitting it to the power supply device to initiate power supply before the next power command value is received, allowing for timely power control adjustments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If front-loaded control is implemented to compensate for communication delays, then control timing is improved, but prediction accuracy deteriorates when communication delays are highly variable

Engineering Contradiction:
Improvecontrol timingVSAvoidprediction accuracy
Core Design Contradiction:
Loss of timeVSMeasurement precision

Solution Approach 1:

The management device performs preliminary actions by generating prediction command values in advance based on past power command values. When a communication delay occurs, the power supply device can immediately execute the pre-calculated prediction command value, compensating for the delay without waiting for the actual next power command value. This preliminary action approach maintains control timing while adapting to variable communication delays.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The system incorporates feedback mechanisms where the power supply device monitors communication delays and adjusts its prediction strategy accordingly. When communication delays are detected, the device uses feedback from past power command values to generate accurate prediction command values, ensuring that prediction accuracy is maintained even when control timing needs to be adjusted.

Inventive Principle:
Principle #23Feedback

2Stability of the object's composition

If prediction command values are used to maintain control timing, then power system stability is improved, but communication delay variability worsens the reliability of prediction

Engineering Contradiction:
Improvepower system stabilityVSAvoidprediction reliability
Core Design Contradiction:
Stability of the object's compositionVSReliability

Solution Approach 1:

The system dynamically adapts to variable communication delays by continuously generating new prediction command values based on the most recent past power command values. When communication delay variability is detected, the prediction strategy is dynamically adjusted to maintain reliability. The power supply device remains in a state ready to execute prediction command values, adapting its prediction horizon and methodology based on real-time communication conditions.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The system changes parameters of the prediction algorithm based on communication delay characteristics. When communication delays are highly variable, the system modifies prediction parameters such as the time horizon, weighting factors, or model complexity to maintain prediction reliability. This parameter adaptation ensures that power system stability is maintained despite varying communication conditions.

Inventive Principle:
Principle #35Parameter changes

Data Source

PatentUS9780562B2Method and system for power system stabilization using prediction confidence based on high-frequency components of power command value
Publication Date: 2017.10.03 PANASONIC HOLDINGS CORP
  • US9780562B2 patent drawing
  • US9780562B2 patent drawing
  • US9780562B2 patent drawing

AI summary

A power system stabilization method includes: receiving a power command value from a power control center that monitors a power system; transmitting the power command value to a power supply device; causing the power supply device to supply power to the power system according to the power command value; generating a prediction command value according to past power command values received from the power control center, the prediction command value being a prediction value of a power command value to be transmitted from the power control center next after the power command value; transmitting the prediction command value to a power supply device; causing the power supply device to supply power to the power system according to the power prediction command value; receiving the next power command value from the power control center; transmitting the next power command value to the power supply device.