Converter-Based Voltage Regulation for Harmonic and Reactive Power Control
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Solution Overview
Problem
Existing voltage regulators struggle to manage reactive power flow and harmonic current components in electrical power distribution networks, leading to equipment overheating and operational irregularities, while traditional solutions like capacitor banks cause switching transients and high maintenance costs.
Innovation Solution
A voltage regulation device with a converter that provides harmonic current compensation and reactive power management, using a control system to determine compensation signals based on harmonic frequency data and reactive power set points, reducing harmonic components and controlling reactive power without active filters or capacitor banks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional capacitor banks are used for reactive power compensation, then reactive power management is achieved, but switching transients and high maintenance costs occur
Solution Approach 1:
The patent replaces mechanical capacitor bank switching with an electronic converter system that uses power electronic switches (IGBTs, MOSFETs, or IGCTs) to generate compensation current. This electronic substitution eliminates mechanical contact wear and switching transients while providing continuous, adjustable reactive power compensation through pulse-width modulation control.
Solution Approach 2:
The converter system dynamically adjusts the amplitude and phase of the compensation current based on real-time detection of voltage and current parameters. By continuously varying these parameters according to load conditions, the system achieves smooth reactive power compensation without the discrete switching steps inherent in capacitor banks, thereby eliminating switching transients.
2Measurement precision
If traditional voltage regulators are used, then voltage monitoring and control is achieved, but harmonic current components are not managed
Solution Approach 1:
The patent integrates multiple functions into a single device: voltage regulation through the electromagnetic circuit and harmonic compensation through the converter. The converter generates compensation current that simultaneously addresses harmonic distortion and supports voltage control, making the system universal in handling both voltage regulation and power quality improvement without requiring separate devices.
Solution Approach 2:
The patent combines the voltage regulator and active filter (harmonic compensator) into a single integrated device. The converter is electrically connected to the electromagnetic circuit, allowing the system to generate compensation current that addresses both voltage regulation and harmonic mitigation in one unified operation, thereby eliminating the need for separate harmonic filtering equipment.
3Reliability
If separate devices are used for voltage regulation and harmonic compensation, then each function is performed, but device complexity and maintenance costs increase
Solution Approach 1:
The patent merges the voltage regulator and active filter into a single integrated device where the converter is electrically connected to the electromagnetic circuit. This consolidation reduces the number of separate components, simplifies system structure, and lowers maintenance requirements while maintaining both voltage regulation and harmonic compensation functions through coordinated operation of the integrated components.
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 device effectively maintains voltage within a desired range, reduces harmonic currents, and manages reactive power flow, improving equipment operation and reducing maintenance costs by eliminating the need for capacitor banks.
Implementation Method 1
a converter configured to provide a compensation current to the shunt winding
Implementation Method 2
an electromagnetic circuit that delivers current from the main winding to an electric load
Data Source
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AI summary
A voltage regulation device includes: an input node configured to receive electrical power from an electrical power source; a primary winding electrically connected to the input node; an output node configured to provide electrical power to a load; a shunt winding electrically connected to the output node; a converter configured to provide a compensation current to the shunt winding; and a control system configured to: determine a harmonic compensation signal based on harmonic frequency data; determine a reactive power compensation signal based on a reactive power set point; and control the converter based on the determined harmonic compensation signal and the determined reactive power compensation signal to produce the output compensation signal. The output compensation signal is configured to reduce the one or more harmonic frequency components in a current that flows in the output node and to control an amount of reactive power at the output node.