Local Power Grid Control via Load Mediation at Grid Connection
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Solution Overview
Problem
Maintaining grid stability is challenging in local power grids with a large number of lower-capacity generators, as existing control methods often require direct external intervention on batteries, which is undesirable for both private households and industrial plants.
Innovation Solution
A control system that includes a load control device and a computing device to generate control signals for controllable electrical loads and sources within the local power grid, allowing for dynamic power transfer management without direct battery control, using a request signal to achieve desired power transfer at the grid connection point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct external control signals are sent to batteries in local power grids, then power transfer control at the grid connection point can be achieved, but this causes undesirable external intervention in private households and industrial plants
Solution Approach 1:
The patent introduces a load control device as an intermediary between the external control system and the electrical loads/sources. This mediator receives control signals and translates them into local control actions, achieving power transfer control without direct external intervention on individual components like batteries. The load control device acts as a buffer that preserves user autonomy while enabling grid-level control objectives.
2Adaptability or versatility
If a large number of lower-capacity decentralized generators are used, then renewable energy expansion is enabled, but maintaining grid stability becomes more challenging
Solution Approach 1:
The system implements feedback mechanisms where the load control device continuously monitors the actual power transfer at the grid connection point and adjusts control signals to controllable electrical loads and sources accordingly. This closed-loop control enables dynamic balancing of decentralized generation and consumption, maintaining grid stability despite the variability inherent in numerous small-scale renewable generators.
Solution Approach 2:
The control system dynamically adjusts power transfer by modulating controllable electrical loads and sources based on real-time grid conditions and request signals. This dynamic control allows the system to adapt to changing generation and demand patterns from decentralized renewable sources, maintaining stability through continuous adjustment rather than static configuration.
3Reliability
If controllable electrical loads and sources are controlled dynamically, then power transfer predictability is improved, but control system complexity increases
Solution Approach 1:
The load control device is designed as a universal controller that can manage multiple controllable electrical loads and sources through a single interface. It handles diverse control objectives (power transfer regulation, local demand response) and works with various types of controllable components (batteries, controllable loads, renewable generators) using standardized control mechanisms, thereby managing complexity through functional integration.
Data Source
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AI summary
The invention provides a method and a control system for controlling a local power grid (1) which is connected to a public power grid (3) at a grid connection point (2).The control system (100) comprises: a load control device (110) configured to control the power consumption and/or power output of controllable electrical loads and/or controllable electrical sources (140-180) of the local power grid (1); and a computing device (120) configured to receive a request signal (71) from outside the local power grid (1), wherein the request signal includes information about a power transfer in at least one period; wherein the computing device (120) is further configured to generate control signals (72) designed to instruct the load control device (110) to control the controllable electrical loads and/or electrical sources (140-180) of the local power grid (1) such that a power transfer (81) is provided at the grid connection point (2) in accordance with the request signal (71) in the at least one period.