STATCOM Booster Converter DC Voltage Stabilization
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Solution Overview
Problem
The high cost and complexity of over-dimensioning STATCOM systems to handle varying DC voltage levels from energy storage devices, leading to increased costs and losses in reactive power support for power transmission networks.
Innovation Solution
A STATCOM system with a booster converter device connected in series with the energy storage device and in parallel with the DC capacitor, allowing for a constant DC voltage operation and reducing the need for expensive components, using a current source converter or thyristor converter to handle voltage differences and provide reactive and active power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the STATCOM is designed to handle the maximum DC voltage level from the energy storage device, then the STATCOM can operate with varying DC voltage, but the cost and complexity of the STATCOM components increase significantly
Solution Approach 1:
A DC/DC converter is introduced as an intermediary device between the energy storage device and the STATCOM. This converter acts as a mediator that transforms the varying DC voltage from the energy storage device into a stable DC voltage suitable for the STATCOM, thereby isolating the STATCOM from voltage variations and allowing it to be designed for a fixed, lower voltage level, reducing its complexity and cost
Solution Approach 2:
The system is divided into two independent functional modules: the energy storage device with its own DC/DC converter, and the STATCOM with its fixed DC voltage requirement. This segmentation allows each module to be optimized independently - the energy storage side handles voltage variation while the STATCOM side maintains fixed specifications, reducing overall system complexity
2Adaptability or versatility
If the DC/DC converter handles the full active power from the energy storage device, then voltage conversion is achieved, but the cost and losses increase
Solution Approach 1:
The DC/DC converter is designed to handle only the reactive power portion of the total power, not the full active power. By sizing the converter for partial power handling (specifically the reactive component), the system achieves voltage conversion capability while minimizing the converter's size, cost, and associated energy losses
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 solution achieves significant cost savings, reduces power handling losses, and allows for the use of less expensive and more robust components, while maintaining efficient reactive and active power support to the power network.
Implementation Method 1
A STATic COMpensator) is an electrical device, which is based on voltage source converter (VSC) technology
Implementation Method 2
A STATCOM system with a booster converter device connected in series with the energy storage device and in parallel with the DC capacitor, allowing for a constant DC voltage operation
Data Source
AI summary
A static compensator system for providing reactive and/or active power to a power network. The system includes a static compensator, which has a DC capacitor Ud and a voltage source converter. The static compensator is connected to an energy storage device. The system further includes a booster converter device connected in series with the energy storage device and in parallel with the DC capacitor Ud of the static compensator. The booster converter device and the energy storage device are further connected in parallel with the voltage source converter of the static compensator.