EV Charge-Discharge Priority Control for Grid Frequency Response
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Solution Overview
Problem
In electric power systems, electric cars with lower priority degrees set a narrower charge/discharge output range, leading to insufficient frequency adjustment capacity, which can't be adequately secured due to prioritization over other cars, affecting system frequency stabilization.
Innovation Solution
A charge/discharge control method where multiple charge/discharge elements receive a request value for frequency adjustment capacity based on system frequency, with output properties corrected according to priority degrees to expand the output range, ensuring sufficient frequency adjustment capacity by adjusting the upper or lower limits of the output range based on priority.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electric cars set charge/discharge output properties according to their own priority degrees, then each electric car can control its charging/discharging preferences, but the frequency adjustment capacity calculated on the system side cannot be sufficiently secured
Solution Approach 1:
The patent applies dynamics by making the charge/discharge output property adjustable and adaptable. The system dynamically adjusts the output property based on priority degrees and system frequency requirements, allowing electric cars to flexibly modify their charging/discharging behavior rather than being fixed. This enables the system to maintain reliability while preserving operational flexibility.
Solution Approach 2:
The patent changes the parameter of output property (power output range) based on priority degrees. By adjusting the output property parameter according to the priority degree and system frequency deviation, the system ensures that frequency adjustment capacity requirements are met while allowing individual electric cars to maintain their charging/discharging preferences.
2Adaptability or versatility
If electric cars with low priority degrees set a narrow charge/discharge output range, then their own charging/discharging preferences are protected, but the overall frequency adjustment capacity of the system is insufficient
Solution Approach 1:
The patent applies local quality by assigning different output properties to different electric cars based on their priority degrees. Each electric car receives a customized output property setting that reflects its priority level, allowing low-priority cars to have narrower ranges while high-priority cars have wider ranges. This localized differentiation ensures overall system reliability while respecting individual preferences.
Solution Approach 2:
The system dynamically adjusts the output property range based on real-time priority degrees and system frequency conditions. When system frequency deviates from the reference frequency, the output properties are adjusted to ensure sufficient frequency adjustment capacity is available, while still allowing individual cars to maintain their preferred operating characteristics.
3Ease of operation
If electric cars prioritize their own battery charging/discharging over others, then individual battery management is improved, but the frequency adjustment capacity acquired by power reception amount control is reduced
Solution Approach 1:
The patent changes the output property parameter based on the priority degree and system frequency requirements. By adjusting this parameter, the system balances individual battery management needs with overall system power requirements, ensuring that frequency adjustment capacity is sufficient while allowing electric cars to prioritize their own battery charging/discharging operations.
Solution Approach 2:
The system uses feedback from the system frequency measurement to adjust the output properties of electric cars. When the system frequency deviates from the reference frequency, the feedback mechanism triggers adjustments to the output properties, ensuring that frequency adjustment capacity is maintained while respecting individual battery management priorities.
Data Source
AI summary
A charge/discharge control method for a charge/discharge element includes receiving a request value (Pfr) of a frequency adjustment capacity according to a system frequency (f) of an electric power system (10) based on a priority degree (β) and the request value (Pfr) being received, the priority degree indicating a degree at which charging or discharging of an own element (EV1) is prioritized over charging or discharging of another charge/discharge element (EV2, EV3, . . . ), correcting the output property to increase an upper limit value or a lower limit value of an output range as the priority degree (β) is higher, and performing charging or discharging with an output determined based on a deviation (Δf) between the system frequency (f) measured at a connection end to the electric power system (10) and a reference frequency (fref) of the electric power system (10) and the output property after the correction.