Distribution Transformer Interface Unit for Voltage Regulation
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Solution Overview
Problem
Conventional distribution transformers lack control capabilities over reactive power flow, voltage regulation, and harmonic compensation, making them inefficient in managing transient sags and spikes, and unable to effectively handle non-linear loads.
Innovation Solution
A distribution transformer interface unit equipped with a shunt converter circuit and a series converter circuit, coupled by a DC bus, which includes energy storage devices and DC/DC converter circuits, allowing for current and voltage regulation, and capable of retrofitting existing transformers to enhance their performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional distribution transformers are used, then the system is simple and cost-effective, but the transformer lacks control capabilities over reactive power flow, voltage regulation, and harmonic compensation
Solution Approach 1:
The distribution transformer interface unit integrates multiple functions including shunt converter circuit for reactive power compensation, series converter circuit for voltage regulation, and harmonic filtering capabilities into a single device that interfaces with the transformer secondary terminals, enabling one unit to perform what previously required multiple separate devices
Solution Approach 2:
The interface unit acts as an intermediary device connected between the distribution transformer secondary terminals and the load, providing control capabilities without modifying the transformer itself, thus adding functionality while maintaining simplicity of the core transformer component
2Reliability
If conventional distribution transformers are used, then the device is rugged and efficient, but it cannot regulate load voltage in real time to compensate for transient sags and spikes
Solution Approach 1:
The series converter circuit continuously monitors load voltage and automatically adjusts its output to compensate for detected deviations, creating a closed-loop control system that maintains voltage stability during transient events without manual intervention
Solution Approach 2:
The interface unit transitions the transformer system from a static device to a dynamic one by enabling real-time adjustment of voltage and reactive power output in response to changing load conditions and transient events
3Adaptability or versatility
If conventional distribution transformers are used, then the system is simple, but the transformer cannot compensate for harmonics introduced by non-linear loads
Solution Approach 1:
The shunt converter circuit serves as an intermediary that actively compensates for harmonic currents generated by non-linear loads by injecting counter-phase harmonic currents, thereby cleaning the load current without requiring modification of the transformer or load devices
4Reliability
If distribution transformer interface unit with shunt and series converter circuits is implemented, then real-time voltage regulation and reactive power management are achieved, but the device complexity increases
Solution Approach 1:
The interface unit combines shunt converter for reactive power compensation, series converter for voltage regulation, and DC bus with energy storage for system stability into a single integrated device, achieving multiple functions simultaneously rather than requiring separate devices for each function
Solution Approach 2:
The patent merges the shunt converter circuit and series converter circuit into a unified interface unit with common DC bus and control system, reducing overall system complexity compared to having completely separate systems while maintaining all required functions
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 solution enables improved performance of distribution transformers by providing real-time voltage regulation, reactive power management, and harmonic compensation, enhancing the efficiency and reliability of power distribution without the need for costly replacements.
Implementation Method 1
a shunt converter circuit having a first port coupled to the at least one external source terminal to provide parallel connection to a secondary winding of the distribution transformer. The apparatus further includes a series converter circuit having a first port coupled between the at least one external load terminal and the at least one external source terminal
Implementation Method 2
at least one energy storage device, such as at least one capacitor, coupled to the second ports of the shunt converter circuit and the series converter circuit
Data Source
AI summary
An apparatus includes at least one external source terminal configured to be connected to at least one secondary terminal of a distribution transformer and at least one external load terminal configured to be connected to a load. The apparatus further includes a converter circuit coupled to the at least one external source terminal and to the at least one external load terminal and configured to provide shunt current regulation and series voltage regulation.