EV Charging Pile Control for Grid Frequency Stability
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Solution Overview
Problem
The integration of intermittent renewable energy sources into China's power grid increases complexity and scheduling difficulties, leading to potential frequency collapses, which can result in unnecessary low-frequency load reductions and significant economic losses. Electric vehicle charging loads are identified as controllable loads that can mitigate these issues by adjusting output power in response to grid frequency fluctuations.
Innovation Solution
An electric vehicle charging pile control system that monitors grid frequency in real-time, using a combination of hardware components like a grid single-phase power input port, voltage transformer, AD conversion chip, data processors, and GPS/Beidou signal receiver to autonomously adjust output power, switching between multi-level charging states to maintain grid frequency stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low-frequency load reduction is implemented to prevent frequency collapse, then frequency stability is improved, but power supply to users is seriously influenced and economic loss occurs
Solution Approach 1:
The charging pile control system performs preliminary action by proactively adjusting or cutting off charging loads when frequency decline is detected, before the low-frequency load reduction action is triggered. This prevents frequency collapse without causing power supply interruption to other users, as the charging pile itself is the one being controlled.
Solution Approach 2:
The charging pile control system applies self-service by autonomously monitoring grid frequency and automatically adjusting its own output power or cutting off charging loads when frequency decline is detected. This self-control mechanism prevents the need for external low-frequency load reduction actions that would affect other users.
2Reliability
If electric vehicle charging loads are cut off during frequency decline, then low-frequency load reduction is prevented, but charging service to electric vehicles is temporarily interrupted
Solution Approach 1:
The system performs preliminary action by detecting frequency decline and adjusting charging loads before the low-frequency load reduction threshold is reached. This prevents frequency collapse while minimizing charging service interruption, as the system can resume charging quickly after frequency stabilizes.
Solution Approach 2:
The charging pile control system applies dynamics by dynamically adjusting output power based on real-time frequency conditions. The system can switch between different output power levels or charging modes, providing a flexible response that balances grid support with charging service continuity rather than simple on/off control.
3Reliability
If real-time frequency monitoring and multi-level power output control are implemented, then frequency safety is improved, but system complexity increases
Solution Approach 1:
The charging pile control system applies universality by integrating multiple functions into a single control unit: real-time frequency monitoring, automatic power adjustment, and multi-level output control. This consolidated approach improves frequency safety while minimizing the increase in overall system complexity compared to separate dedicated systems.
Solution Approach 2:
The control system applies self-service by autonomously performing frequency monitoring and power adjustment without requiring external control signals or complex communication infrastructure. The system self-manages the control logic and execution, reducing the need for additional control infrastructure and simplifying the overall system architecture.
Data Source
AI summary
The invention discloses an electric vehicle charging pile control system and method considering grid frequency safety. The electric vehicle charging pile control system comprises a grid single-phase power input port, a voltage transformer, an AD conversion chip, a first data processor and a second data processor connected successively; the first data processor is further connected with a data real-time display device and a GPS/Beidou signal receiver respectively; the second data processor communicates with an electric vehicle charging pile and an electric vehicle battery pack respectively; and the second data processor is further connected with a man-machine interaction device. The invention has the beneficial effects that: the frequency of a power system can be monitored in real time; when the frequency is relatively low after a fault of the power system, part of unimportant electric vehicle charging loads are cut off to reduce the active power vacancy of the system; low-frequency load reduction is effectively prevented; and the time for restoring the frequency of the power system is shortened.