Virtual Synchronous EV Charging Control for Grid Frequency Support
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Solution Overview
Problem
The integration of electric vehicles into the power grid leads to uncontrolled charging and discharging behaviors, which exacerbate the instability of the grid due to insufficient dynamic regulation, reduced system inertia, and damping, necessitating a solution that mimics traditional synchronous generators to provide frequency and voltage support.
Innovation Solution
A charging and discharging control method and system for electric vehicles based on virtual synchronization, utilizing a virtual synchronous charging and discharging apparatus connected via AC and DC interfaces, with a central control unit to regulate power and energy flow, simulate inertia and damping, and perform reactive power compensation, harmonic compensation, and frequency regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electric vehicles are integrated into the power grid for charging and discharging, then the flexibility and energy storage capability of the power system is improved, but the grid stability deteriorates due to uncontrolled charging and discharging behaviors
Solution Approach 1:
The virtual synchronous charging and discharging machine implements feedback control by continuously monitoring grid frequency and voltage, and adjusting charging/discharging power accordingly. The control system uses frequency deviation and voltage deviation as feedback signals to regulate the output power, ensuring grid stability while utilizing EV energy storage capabilities.
Solution Approach 2:
The virtual synchronous charging and discharging machine acts as an intermediary between the electric vehicle battery and the power grid. It provides a control layer that translates raw charging/discharging capabilities into grid-friendly operations, mediating the interaction between EV energy storage and the power system to maintain stability.
2Device complexity
If traditional power grid operation is maintained without virtual synchronization, then the system structure is simple, but the dynamic regulation ability is insufficient due to reduced system inertia and damping
Solution Approach 1:
The virtual synchronous charging and discharging machine copies the external characteristics of traditional synchronous generators without requiring physical rotating mass. It simulates the inertia and damping effects of synchronous machines through control algorithms, allowing the system to maintain dynamic regulation ability while using modern power electronic interfaces.
Solution Approach 2:
The invention replaces the mechanical inertia of traditional synchronous generators with a virtual inertia mechanism implemented through control software. Instead of relying on physical rotating mass to provide inertia and damping, the system uses algorithms that calculate and inject appropriate power adjustments to mimic the stabilizing effects of mechanical systems.
3Ease of operation
If uncontrolled charging and discharging is allowed, then the ease of operation is improved, but the harmful impact on the power grid is aggravated
Solution Approach 1:
The virtual synchronous charging and discharging machine enables the electric vehicle battery system to automatically regulate its own charging and discharging operations based on grid conditions. The system self-adjusts its power flow to provide frequency and voltage support, eliminating the need for external control while preventing harmful impacts on grid stability.
Data Source
AI summary
The present invention discloses a charging and discharging control method and system for an electric vehicle based on virtual synchronization, and relates to the technical field of virtual synchronization. The method includes: establishing connection between a power grid and the electric vehicle, and acquiring a charging and discharging operation demand; acquiring, according to the charging and discharging operation demand, a corresponding control instruction and constraint condition, and executing a charging and discharging operation; and providing a human-computer interaction interface for measuring and settling charging and discharging energy, along with authentication. The present invention achieves efficient and coordinated charging and discharging control, precise measurement and convenient authentication, and improves availability and reliability of the system.