All-DC Building Power System with Renewable Storage
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Solution Overview
Problem
Current AC power supply systems in buildings require voltage regulators and rectifiers for DC devices, leading to increased hardware costs and power loss, and fail to fully utilize renewable energy sources like photovoltaic power due to mismatched power generation and consumption.
Innovation Solution
A system and control method for all-DC power supply and storage, incorporating renewable energy generation, DC/DC and AC/DC conversion apparatuses, voltage DC buses, and power adjustment apparatuses with energy storage, allowing direct DC power distribution and balancing of power generation, supply, and consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If AC power supply mode is used, then buildings can be supplied with standard AC power, but each electrical device requires voltage regulators and rectifier apparatus increasing hardware costs and causing power loss
Solution Approach 1:
The patent extracts the AC-DC conversion function from individual electrical devices and centralizes it in a building-level power distribution system. By taking out the rectifier and voltage regulator from each device, the system eliminates redundant hardware and reduces overall power loss through a single centralized conversion point.
Solution Approach 2:
The patent creates a universal DC power distribution infrastructure that serves multiple electrical devices simultaneously. The DC bus and distribution network provide a common platform that can power various DC devices without requiring individual AC-DC conversion units, achieving multi-functionality through a shared power delivery system.
2Productivity
If photovoltaic power generation is installed in buildings, then renewable energy can be utilized, but the power generation does not match power consumption reducing full utilization of renewable energy
Solution Approach 1:
The patent implements preliminary action by using energy storage systems to save excess photovoltaic power generation for later use. The battery storage accumulates surplus renewable energy during periods of high generation and low consumption, making it available during peak demand periods when solar generation is insufficient, thereby ensuring continuous and full utilization of renewable energy resources.
Solution Approach 2:
The patent introduces an intermediary energy storage system between the photovoltaic generation and the electrical load. This mediator decouples the mismatch between variable renewable generation and fluctuating power consumption, allowing the system to balance supply and demand by storing excess energy and releasing it when needed, thus achieving full utilization of photovoltaic power.
3Productivity
If energy storage apparatus is added to balance power generation and consumption, then renewable energy utilization improves, but system complexity increases
Solution Approach 1:
The patent merges the energy storage system with the existing DC power distribution infrastructure, integrating the battery and charge-discharge conversion apparatus into the unified DC bus system. This combination allows the energy storage to work seamlessly with the DC-DC conversion and existing power management, reducing overall system complexity compared to adding standalone storage to an AC system.
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 solution eliminates the need for voltage regulators and rectifiers, reduces power loss, and fully utilizes renewable energy by adjusting battery charging and discharging, enhancing peak-load shifting, reducing grid capacity, and improving power generation efficiency.
Implementation Method 1
a first DC/DC conversion apparatus, configured to convert DC voltage generated by the renewable energy power generation apparatus into voltage of the first voltage DC bus
Implementation Method 2
an AC/DC conversion apparatus, configured to convert AC power from the mains grid system into DC power
Implementation Method 3
the first charge-discharge conversion apparatus is configured to control charge/discharge of the first energy storage apparatus
Implementation Method 4
a renewable energy power generation apparatus
Data Source
AI summary
The present invention discloses a system and control method of all-DC power supply and storage for a building. The system includes a renewable energy power generation apparatus, a mains grid system, a first DC/DC conversion apparatus, an AC/DC conversion apparatus, a first voltage DC bus, a first energy storage apparatus, and a first charge-discharge conversion apparatus. The first DC/DC conversion apparatus is configured to convert DC voltage generated by the renewable energy power generation apparatus to voltage of the first voltage DC bus. The AC/DC conversion apparatus is configured to convert AC power from the mains grid system to DC power. The first charge-discharge conversion apparatus is configured to control charge/discharge of the first energy storage apparatus. The first voltage DC bus is connected to a first electrical device and configured to power the first electrical device.