Reactive Power Compensation Inverter for Harmonic-Filtered Grid Output
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Solution Overview
Problem
Existing power systems connected to wind turbines face challenges in generating sufficient reactive power and reducing harmonic currents, which are essential for compliance with utility grid requirements.
Innovation Solution
The integration of a bi-directional power converter system with a rotor-side converter and a line-side converter, along with a reactive power compensation inverter and an active harmonic filter, to enhance reactive power generation and reduce harmonic currents injected into the power grid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional power system is used without additional reactive power and harmonic components, then the device complexity is low, but the reactive power generation is insufficient and harmonic currents are not reduced
Solution Approach 1:
The patent combines the reactive power compensation inverter and active harmonic filter into a single integrated power system configuration. Both functions share common hardware resources including the bi-directional power converter, control unit, and electrical connection to the wind turbine generator, thereby achieving multiple objectives without proportionally increasing system complexity
Solution Approach 2:
The power converter system is designed to perform multiple functions simultaneously: it generates reactive power to meet utility requirements and actively filters harmonic currents to ensure compliance with agency standards. The control unit coordinates both reactive power compensation and harmonic mitigation functions through a unified control architecture
2Reliability
If a bi-directional power converter system with reactive power compensation inverter and active harmonic filter is integrated, then reactive power output increases and harmonic currents are reduced, but the device complexity increases
Solution Approach 1:
The reactive power compensation inverter and active harmonic filter are merged into a single integrated system that shares common hardware resources. The bi-directional power converter serves both functions, and the control unit manages both reactive power compensation and harmonic filtering through unified control logic, reducing overall system complexity
Solution Approach 2:
The control unit automatically regulates both reactive power output and harmonic current suppression without requiring external intervention. The system self-adjusts to maintain compliance with utility grid requirements and agency standards through closed-loop control mechanisms
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 configuration effectively increases reactive power output while minimizing harmonic currents, ensuring compliance with agency standards and improving the overall efficiency and reliability of power transmission to the grid.
Implementation Method 1
a bi-directional power converter operably connected between the rotor of the rotor-stator generator and a source of direct current
Implementation Method 2
a reactive power compensation inverter electrically connected within the electrical power system
Implementation Method 3
an active harmonic filter electrically connected within the electrical power system
Data Source
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AI summary
An electrical power system connectable to a power grid includes a cluster of electrical power subsystems, each of the electrical power subsystems including a power converter electrically coupled to a generator having a generator rotor and a generator stator. Each of the electrical power subsystems defines a stator power path and a converter power path for providing power to the power grid. Each of the electrical power subsystems further includes a transformer. The system further includes a subsystem breaker configured with each of the electrical power subsystems, and a cluster power path extending from each subsystem breaker for connecting the cluster of electrical power subsystems to the power grid. The system further includes a reactive power compensation inverter electrically coupled within the electrical power system, the reactive power compensation inverter operable to increase the reactive power level in the electrical current flowing to the power grid.