Power Conversion Module Voltage Control for EMC
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Solution Overview
Problem
Existing DC to AC power conversion systems face challenges in achieving reliable and efficient AC power supply due to poor Electromagnetic Compatibility (EMC) and harmonic quality, leading to interference and undue heating in connected devices, and require stable control of modules transitioning in and out of series circuits.
Innovation Solution
A method for controlling a power conversion system by transitioning the voltage of storage devices between modules to create an AC signal, defining voltage control levels, regulating AC current, and selecting modules based on preference levels and power point differential values to optimize module operation and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If modules are transitioned in and out of series to create AC signal, then AC power conversion is achieved, but Electromagnetic Compatibility deteriorates and harmonic quality worsens
Solution Approach 1:
The patent applies dynamics by making the module configuration movable and adjustable. Modules are dynamically transitioned in and out of series connections based on real-time voltage control levels and storage device states. This dynamic reconfiguration allows the system to create AC signals while maintaining control over EMC and harmonic quality through regulated transition timing and voltage levels.
Solution Approach 2:
The patent changes physical parameters by defining specific voltage control levels for storage devices and regulating AC current over time periods. The target values for storage parameters are dynamically adjusted (decreased or increased) based on whether voltage control levels are reached. These parameter changes ensure that modules operate within optimal ranges to maintain EMC and harmonic quality during AC power conversion.
2Adaptability or versatility
If modules are transitioned in and out of series circuit, then AC signal is generated, but control stability deteriorates
Solution Approach 1:
The patent implements feedback by continuously monitoring the states of storage devices and comparing them against defined voltage control levels. The system uses this feedback to determine which modules should be transitioned in or out of series connections. Target values for storage parameters are adjusted based on feedback from whether voltage control levels are reached, ensuring stable and controlled AC signal generation.
Solution Approach 2:
The patent applies preliminary action by pre-defining voltage control levels for storage devices before transitions occur. These predetermined levels serve as reference points that guide the transition decisions. By establishing control parameters in advance, the system ensures stable and predictable module transitions while generating AC signals.
3Object-affected harmful factors
If voltage control levels are strictly maintained, then EMC and harmonic quality improve, but module transition flexibility decreases
Solution Approach 1:
The patent resolves this contradiction by making the voltage control system dynamic. While voltage control levels are defined to maintain EMC and harmonic quality, the target values for storage parameters are dynamically adjusted based on system conditions. Modules can be transitioned in or out of series connections when voltage control levels are reached, providing flexibility while maintaining quality standards through regulated transitions.
Data Source
AI summary
Described is a method for converting power including controlling operation of a plurality of series connected modules including a DC power sources and storage devices such that the total voltage across the series connected modules includes an AC signal. A storage parameter is defined based on a sum of a function of the voltages in the storage devices in the modules and one or more voltage control levels are defined for each of or a plurality of the storage devices. An average current drawn from the series connected modules over a time period is set such that the storage parameter approaches a target value. The target value is decreased for a subsequent time period in the event that none the voltage control levels are reached and increased in the event that one or more of the voltage control levels are reached.