Transformer-Less DCSTATCOM for Data Center Active and Reactive Power
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Solution Overview
Problem
Existing data center power systems face inefficiencies due to bulky transformers and high costs associated with UPS and STATCOM systems, which also fail to provide both active and reactive power compensation effectively.
Innovation Solution
A transformer-less multi-level DCSTATCOM system incorporating a two-stage DC-DC converter and multi-level inverter for simultaneous active and reactive power control, eliminating the need for separate UPS systems and reducing the footprint and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional UPS and STATCOM systems are used separately, then active power compensation and reactive power compensation are provided, but device complexity and cost increase
Solution Approach 1:
The patent combines UPS and STATCOM functions into a single integrated DCSTATCOM system. The power conversion unit handles both active power compensation (UPS function) and reactive power compensation (STATCOM function) simultaneously, eliminating the need for separate devices and reducing overall system complexity while maintaining both functions
Solution Approach 2:
The DCSTATCOM system is designed to perform multiple functions: active power compensation, reactive power compensation, and voltage regulation. The power conversion unit can operate in different modes to provide UPS functionality, STATCOM functionality, or both simultaneously, making the system universal and multi-functional
2Reliability
If traditional UPS and STATCOM systems are used separately, then both active and reactive power compensation are achieved, but cost increases
Solution Approach 1:
The patent merges separate UPS and STATCOM systems into one integrated DCSTATCOM. By sharing common components such as the power conversion unit, control system, and housing, the patent reduces manufacturing costs, material requirements, and installation expenses while achieving both active and reactive power compensation functions
Solution Approach 2:
The multi-functional DCSTATCOM system provides UPS, STATCOM, and voltage regulation capabilities through a single device. This universality eliminates the need to manufacture and install multiple separate systems, reducing overall CAPEX and making the system more cost-effective for data centers requiring both active and reactive power support
3Power
If transformers are included in the system, then voltage transformation is achieved, but device footprint and cost increase
Solution Approach 1:
The patent extracts and eliminates the transformer component from the traditional UPS/STATCOM system. The power conversion unit directly connects to the medium voltage grid through a coupling device, removing the need for bulky transformers while maintaining voltage transformation capabilities through power electronic conversion
Solution Approach 2:
The patent replaces the mechanical transformer system with an electronic power conversion system. The power conversion unit uses semiconductor devices to perform voltage transformation and power conversion electronically, eliminating the need for large magnetic components and reducing the overall system footprint while maintaining the required power handling capabilities
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
The DCSTATCOM system achieves high efficiency and cost savings by integrating active and reactive power compensation, reducing CAPEX and OPEX, and optimizing power density without the need for transformers.
Implementation Method 1
a two-stage DC-DC converter and a multi-level inverter coupled together. The DC-DC converter is configured for bidirectional power flow. The DC-DC converter converts a low or medium voltage from the energy storage device to a high voltage
Implementation Method 2
The multi-level inverter converts the high DC voltage into a medium AC voltage
Data Source
AI summary
Systems and methods for supplying power (both active and reactive) at a medium voltage from a DCSTATCOM to an IT load without using a transformer are disclosed. The DCSTATCOM includes an energy storage device, a two-stage DC-DC converter, and a multi-level inverter, each of which are electrically coupled to a common negative bus. The DC-DC converter may include two stages in a bidirectional configuration. One stage of the DC-DC converter uses a flying capacitor topology. The voltages across the capacitors of the flying capacitor topology are balanced and switching losses are minimized by fixed duty cycle operation. The DC-DC converter generates a high DC voltage from a low or high voltage energy storage device such as batteries and/or ultra-capacitors. The multi-level, neutral point, diode-clamped inverter converts the high DC voltage into a medium AC voltage using a space vector pulse width modulation (SVPWM) technique.