AC Grid Frequency Stabilization via Interconnector Power Direction
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Solution Overview
Problem
Existing methods for stabilizing AC voltage grid frequency using energy storage devices are limited by their capacity, leading to incomplete charging or discharging during frequency fluctuations, making them unreliable for long-term power compensation.
Innovation Solution
A method and installation that utilize an interconnector to measure power flow between AC voltage grids, initiating active power exchange between the energy storage device and the grid based on power direction, ensuring the device is fully charged or discharged, and using modular multi-level converters with supercapacitors for efficient and rapid frequency response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the energy storage device is used to stabilize frequency by drawing or delivering active power during frequency fluctuations, then the frequency stabilization function is improved, but the device capacity is limited and it becomes completely full or empty after a few seconds, making the method unreliable for long-term operation
Solution Approach 1:
The control device initiates drawing or delivering of active power in advance based on the measured direction of power flow in the interconnector, before frequency fluctuations actually occur. This preliminary action prepares the energy storage device to be in the optimal charge state to respond to upcoming frequency changes, ensuring it has sufficient capacity when needed and avoiding complete charge or discharge states that would prevent further operation
Solution Approach 2:
The system continuously measures the direction of power flow in the interconnector and uses this feedback information to control the active power exchange with the energy storage device. This closed-loop control ensures the energy storage device is charged or discharged in response to actual grid conditions, maintaining reliable operation over extended periods by adapting to changing power flow patterns
2Speed
If the energy storage device exchanges active power with the AC voltage grid to respond to frequency changes, then the frequency response capability is improved, but the device can only operate for a few seconds before becoming completely full or empty
Solution Approach 1:
By measuring the direction of power flow in the interconnector in advance and initiating appropriate charging or discharging actions, the system prepares the energy storage device proactively. This ensures the device maintains sufficient charge capacity to provide rapid frequency response over extended periods, rather than depleting its capacity in just a few seconds
Solution Approach 2:
The control device dynamically adjusts the active power exchange based on the measured power flow direction in the interconnector. This dynamic control allows the energy storage device to adapt its charge/discharge operations in real-time, maintaining both rapid response capability and extended operational duration by responding to actual grid conditions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides reliable and efficient stabilization of AC voltage grid frequency by ensuring maximum availability of the energy storage device, allowing for effective and cost-effective active power exchange, and quick reaction to frequency fluctuations.
Implementation Method 1
active power is exchanged between the AC voltage grid and an energy storage device of a compensation installation
Implementation Method 2
modular multi-level converters with supercapacitors for efficient and rapid frequency response
Data Source
AI summary
A method for stabilizing a frequency in an AC voltage grid includes exchanging active power between the AC voltage grid and an energy storage device of a compensation installation in which the energy storage device is connected to the AC voltage grid. An electrical power is transmitted in an interconnector that connects the AC voltage grid to a further AC voltage grid. The electrical power is measured. The exchange of the active power is initiated by a control device of the compensation installation depending on a direction of the transmitted power. An installation for stabilizing an AC voltage grid can be used, in particular, to carry out the method.