Hypersinusoidal AC Grid Power Throughput via Third Harmonic Injection
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Solution Overview
Problem
Existing AC grid technologies face limitations in increasing power throughput and reducing line losses, as they require costly full inverters and cannot efficiently transmit non-sinusoidal voltages, restricting the use of methods like HVDC and trapezoidal modulation due to high harmonic content and transformer incompatibility.
Innovation Solution
The method introduces hypersinusoidal conductor-ground voltages, derived from higher phase voltages by coupling and decoupling high-frequency differential voltages, allowing for increased phase voltages without exceeding insulation limits, thereby enhancing power transmission capacity and reducing line losses without altering the existing transmission path or adding a fourth conductor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If full inverters are used to increase power throughput (HVDC, trapezoidal modulation), then power transmission capacity increases, but device complexity and cost increase significantly
Solution Approach 1:
The patent segments the inverter function into two parts: a simple harmonic generator that creates only the third harmonic voltage, and the existing grid infrastructure that handles power transmission. This segmentation eliminates the need for complex full inverters while maintaining power transmission capability.
Solution Approach 2:
The patent changes the voltage waveform parameter from sinusoidal to include a third harmonic component, creating a hypersinusoidal waveform. This parameter change increases the time area under the voltage curve, thereby increasing power transmission capacity without requiring complex inverters.
2Power
If trapezoidal or full-block modulation is used to increase power throughput, then power transmission capacity increases, but harmful factors increase due to high harmonic content
Solution Approach 1:
The patent applies local quality by selectively adding only the beneficial third harmonic component to the voltage waveform while avoiding other harmonics. This localized modification increases power capacity without introducing the harmful high-frequency harmonics present in trapezoidal modulation.
Solution Approach 2:
The patent converts the typically harmful third harmonic into a beneficial element. By intentionally adding the third harmonic in a controlled manner, the patent increases the voltage time area and power transmission capacity while avoiding the harmful effects of uncontrolled harmonics.
3Power
If phase voltage amplitude is increased to increase power throughput, then power transmission capacity increases, but insulation requirements increase
Solution Approach 1:
The patent uses dynamic voltage control where the hypersinusoidal voltage with third harmonic is applied during normal operation to increase power capacity, while the system can dynamically switch to standard sinusoidal voltage when insulation limits are approached, providing adaptive operation.
Solution Approach 2:
The patent creates a multi-functional voltage system that can operate in two modes: hypersinusoidal mode for maximum power transmission when insulation allows, and standard sinusoidal mode when insulation limits are reached. This universality allows the system to adapt to different operational conditions.
4Power
If HVDC transmission is used to increase power throughput, then power transmission capacity increases, but device complexity and cost increase due to full inverters and sinus filters
Solution Approach 1:
The patent extracts only the essential function needed for power capacity increase (adding third harmonic voltage) while leaving out the complex components of HVDC systems (full inverters, sinus filters). This extraction achieves the power increase goal with minimal added complexity.
Solution Approach 2:
The patent replaces expensive, complex full inverters with a simple, inexpensive third harmonic voltage source. The simplified device is easier to implement and maintain, achieving the same power transmission enhancement at lower cost and complexity.
Data Source
AI summary
A method increases the power of an AC grid by means of the conductors which connect the grid coils of the grid transformer. The conductor-ground voltages and the AC phase voltage are kept lower than a voltage value. The sinusoidal phase voltages of the expanded grid are increased by up to 25% compared to the AC phase voltages, while the phase currents always remain sinusoidal. To this end, the Δ generators couple harmonic voltages between the conductors and ground and reduce the amplitude of the resulting hypersinusoidal conductor-ground voltages such that they always remain below the Uix value. In addition, the Δ generators control the transferred grid power.