Home Energy Control Using Net Power and Time-Based Grid Pricing
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Solution Overview
Problem
Current home energy management systems lack comprehensive control over power supply and consumption, including public power grids and power generation devices, leading to insufficiently detailed energy system management.
Innovation Solution
A control method for a home energy system that includes a power distribution device, non-time-shifting power generation device, and energy storage device, which predicts net power and controls power supply and consumption based on electricity prices, allowing the system to be powered by energy storage, public power grids, or both to optimize electricity bills.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the smart power distribution box controls each circuit load on and off, then remote control of home loads and power management is achieved, but comprehensive control of power supply and consumption is insufficient
Solution Approach 1:
The energy management device is designed to perform multiple functions: it controls not only load switching but also power generation device operation, energy storage charging/discharging, and coordinates with public power grid. This multi-functional design resolves the contradiction by expanding the control scope from simple load switching to comprehensive energy system management.
Solution Approach 2:
The system segments the home energy system into controllable modules: loads, power generation devices, and energy storage devices. Each module can be independently controlled and monitored, allowing comprehensive management while maintaining operational simplicity through modular architecture.
2Device complexity
If the home energy system only controls switching of loads and power generation device, then system complexity is reduced, but energy system management detail is insufficient
Solution Approach 1:
The energy management device continuously monitors and obtains actual power consumption data of loads and actual power generation data of power generation devices. This feedback mechanism enables detailed energy management by providing real-time data for analysis and control decisions, resolving the contradiction between simple structure and detailed management.
Solution Approach 2:
The system automatically calculates net power by comparing power generation and power consumption data, and autonomously makes control decisions based on predetermined conditions and electricity prices. This self-service capability enables detailed energy management without requiring complex manual intervention.
3Loss of energy
If the system controls power supply and consumption based on electricity prices, then electricity bill optimization is achieved, but system complexity increases
Solution Approach 1:
The system uses electricity price as a varying parameter to dynamically adjust control strategies. By changing control parameters (power supply/source selection) based on price parameters, the system optimizes electricity costs while managing complexity through parameter-based decision-making rather than complex rule sets.
Solution Approach 2:
The system predicts net power for upcoming time periods in advance and pre-determines control strategies based on forecasted electricity prices and predicted net power. This preliminary action allows optimization of electricity bills by preparing control decisions before actual consumption occurs, reducing the need for complex real-time control logic.
Data Source
AI summary
Provided are a control method for a home energy system (100), an energy system, an energy management device, and a computer-readable storage medium. The control method includes: when the home energy system (100) is in a grid-connected state and a non-time-shifting power generation device is in a power-supply state, obtaining net power of the home energy system (100) during each power consumption time period of a current day, and when the net power is smaller than zero, controlling, based on an electricity price of the public grid (20), the home energy system (100) to be power by an energy storage device (12) or by the public grid (20); and when the net power is greater than zero, controlling the power generation device to output electric energy to the energy storage device (12) or the public power grid (20).