Smart Inverter with DC Source Flexibility and Grid Adaptability
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Solution Overview
Problem
There is a need for flexible and efficient renewable power generation systems that can harness various forms of renewable energy, such as solar and wind, to provide reliable electricity in areas with limited infrastructure, like those affected by the Ebola outbreak in West Africa, where access to electricity and water is crucial for healthcare and daily life.
Innovation Solution
The development of smart renewable power generation systems with grid and DC source flexibility, which can intelligently select power from multiple DC sources, invert DC to AC, supply power to both AC and DC loads, and charge batteries, using a configurable software-based DC source selection criteria to optimize energy use and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple DC sources are integrated into a single inverter system, then system versatility and energy optimization improve, but device complexity increases
Solution Approach 1:
The patent combines multiple DC source inputs (solar panels, wind generators, batteries) into a single inverter unit with unified control circuitry. The inverter integrates multiple maximum power point tracking (MPPT) algorithms that can independently manage each DC source while sharing common inversion hardware, thereby achieving versatility without proportionally increasing overall system complexity.
Solution Approach 2:
The inverter is designed as a universal platform capable of accepting various DC sources (photovoltaic, wind, battery) and providing multiple output modes (grid-tied, off-grid, hybrid). The configurable software allows the same hardware to adapt to different application scenarios, eliminating the need for separate dedicated inverters for each DC source type.
2Productivity
If intelligent DC source selection is implemented, then energy efficiency improves, but control system complexity increases
Solution Approach 1:
The inverter incorporates real-time monitoring of voltage, current, and power output from each DC source, along with grid conditions and load requirements. The control algorithm continuously adjusts the operating point of each source based on feedback signals, implementing intelligent selection and maximum power point tracking (MPPT) to optimize energy conversion efficiency dynamically.
Solution Approach 2:
The control system dynamically adapts its operation mode based on real-time conditions. It can switch between different MPPT strategies, adjust priority levels of DC sources, and modify power distribution ratios according to changing environmental conditions, load demands, and grid status, thereby achieving high efficiency without requiring overly complex static control logic.
3Adaptability or versatility
If the system can operate in both grid-connected and off-grid modes, then system adaptability improves, but device complexity increases
Solution Approach 1:
The inverter implements dynamic mode switching capability that allows seamless transition between grid-connected and off-grid operations. The control system continuously monitors grid availability and automatically adjusts its operating parameters, synchronization mechanisms, and power flow management strategies according to the current mode, providing grid flexibility without requiring physically separate systems for each mode.
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
These systems enable the efficient conversion and storage of renewable energy, ensuring a stable power supply for both grid-connected and off-grid applications, extending battery life and providing power for essential loads like vaccines refrigeration and household use without the need for a battery in all configurations.
Implementation Method 1
invert DC power to AC power
Data Source
AI summary
A method and apparatus is disclosed relating to smart renewable power generation systems with grid and DC source flexibility that can (1) intelligently and selectively pull power from one or multiple DC sources including solar panels, wind generators, and batteries based on certain criteria; (2) invert DC power to AC power; (3) supply the AC power to the electric grid or to an off-grid electric circuit to power AC loads; (4) supply DC power through one or multiple DC output ports to power DC loads; and (5) charge batteries. Various types of on-grid, off-grid, and on/off-grid DC flexible power inverters are described to demonstrate the innovation for delivering flexible, cost-effective, and user-friendly power generation systems to harvest any form of renewable energy available and convert it to usable electricity.