Battery Charge-Discharge Command Control for Short-Period Power Fluctuations
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Solution Overview
Problem
Existing power system control technologies, such as those described in Patent Literature 1, are unable to respond to rapid power changes within short timeframes, leading to potential overload conditions in devices like section switchgear or rectifiers due to long transmission periods of control commands.
Innovation Solution
A command device that includes a communication unit to receive external charge-discharge commands and a short-period component extraction unit to calculate and add a local control value to the external command, allowing for rapid adjustment of power fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a long-period control command transmission method is used to ensure stable power system control, then the reliability of power system management is improved, but the system cannot respond to rapid short-term power changes, causing overload conditions in devices such as section switchgear and rectifiers
Solution Approach 1:
The patent segments the control command into two distinct components: a basic command value transmitted periodically for stable long-term control, and a supplementary command value generated in real-time based on short-period power fluctuations. This segmentation allows each component to address different time scales of power variations, resolving the contradiction between reliable periodic control and rapid response requirements
Solution Approach 2:
The patent implements preliminary action by calculating the supplementary command value in advance based on predicted short-period power fluctuations. By anticipating and preparing control adjustments before actual overload conditions occur, the system can respond rapidly to power changes while maintaining the stability provided by periodic basic commands
2Stability of the object's composition
If control commands are transmitted every five minutes to eliminate long-period fluctuations, then the stability of power system control is improved, but the system cannot respond to rapid changes occurring within one minute or less
Solution Approach 1:
The patent ensures continuity of useful action by operating two control mechanisms simultaneously: periodic basic command transmission for long-term stability and continuous supplementary command generation based on real-time power measurements. This dual-approach maintains uninterrupted control coverage across all time scales, preventing both long-period fluctuations and short-term rapid changes
3Reliability
If reserve power is calculated based on previous charge-discharge commands to ensure requested power amounts, then the reliability of meeting power demands is improved, but the system lacks adaptability to unexpected rapid power changes
Solution Approach 1:
The patent implements feedback by continuously monitoring actual power fluctuations and using this real-time information to generate supplementary command values. This feedback mechanism allows the system to adapt dynamically to unexpected power changes while the basic command value ensures reliable fulfillment of scheduled power demands, combining both reliability and adaptability
Data Source
AI summary
A command device according to the present disclosure includes a first communication unit that receives a first command value representing an externally-commanded charge-discharge amount with respect to a storage battery connected to a power system, a low-pass filter and a high-pass filter for extracting a short-period component of a measurement value with respect to electrical power at an interconnection point of a PCS that controls charging and discharging of the storage battery, and an amount-of-control calculation unit that calculates a third command value by addition of a first command value and a second command value generated based on the short-period component, and commands the PCS to use the third command value.