Battery Control Device for Power System Frequency Stabilization
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Solution Overview
Problem
The existing power system control methods struggle to effectively manage short-term variations in renewable power sources, such as photovoltaic power generation, due to difficulties in anticipating weather-induced changes, leading to an inability to reflect these changes in the operation schedule of secondary batteries, resulting in an imbalance between power demand and supply.
Innovation Solution
A battery control system comprising a battery control device that detects battery-related information and communicates with an external device to receive operation control information, allowing it to adjust its operations based on the actual state of the power system, including system frequency and battery state, thereby enabling dynamic control of charge and discharge operations to stabilize the power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power system control device determines the operation schedule of the secondary battery based on power demand forecast and transmits it to the secondary battery control system, then the operation schedule is established in advance, but the schedule cannot reflect short-term weather-induced changes in renewable power generation
Solution Approach 1:
The power system control device determines and transmits the operation schedule of the secondary battery in advance based on power demand forecasts. This preliminary scheduling ensures reliable power demand and supply adjustment while the system prepares for potential weather-induced variations
Solution Approach 2:
The secondary battery control system detects actual power generation amounts from renewable sources and compares them with the scheduled values. When deviations exceed a threshold, the system automatically generates correction instructions and transmits them back to the secondary battery, enabling real-time adjustments based on feedback from actual system conditions
2Ease of operation
If the secondary battery control system controls charge and discharge in accordance with the operation schedule irrespective of the actual state of the power system, then the control is simple and automatic, but the control cannot respond to real-time variations in power generation
Solution Approach 1:
The secondary battery control system automatically detects actual power generation amounts, compares them with scheduled values, and independently determines whether correction is needed. The system serves itself by generating and transmitting correction instructions without requiring manual intervention, maintaining ease of operation while improving reliability
Solution Approach 2:
The system continuously monitors actual power generation and feeds this information back to the control logic. Based on this feedback, the system automatically adjusts charge and discharge operations to maintain power balance accuracy while preserving automatic control functionality
3Reliability
If thermal power generation equipment is used to adjust the balance of power demand and supply, then the balance can be adjusted, but the method is insufficient to compensate for variations caused by distributed power sources
Solution Approach 1:
The secondary battery serves multiple functions: it adjusts power demand and supply balance like thermal power generation, but also responds rapidly to short-term variations from renewable sources. The battery system is designed to handle both scheduled operations and real-time corrections, making it a universal solution that combines the advantages of different power adjustment methods
Solution Approach 2:
The patent replaces thermal power generation equipment with a secondary battery system for power balance adjustment. The battery system substitutes the slow-responding thermal generation mechanism with a faster electrochemical system that can rapidly charge and discharge to compensate for variations in renewable power generation
Data Source
AI summary
A battery control device controlling an operation of a battery connected to a power system includes detection means that detects battery-related information that shows a state of the battery, or a voltage of an interconnection point of the power system and the battery, first communication means that transmits a detection result of the detection means to an external device, and receives operation control information to control the operation of the battery from the external device, and control means that controls the operation of the battery, based on a state of the power system and the operation control information received by the first communication means.