Distributed Load Control for Distribution Voltage Support
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Solution Overview
Problem
Conventional electrical power grids face challenges in managing voltage fluctuations due to mismatches between power generation and demand, leading to overvoltage or undervoltage conditions that can degrade load operational efficiency and cause equipment failure, particularly at the distribution level where corrections are more difficult to implement.
Innovation Solution
A system comprising electricity-consuming loads connected to a distribution circuit with load controllers that execute voltage support response curves, adjusting power draw based on circuit voltage excursions, with unique trigger and release voltages for each load to collectively manage voltage fluctuations without centralized control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage is managed from the generation side by adding or reducing generation capacity, then grid voltage can be maintained, but device complexity and response time increase
Solution Approach 1:
The patent divides the voltage management function into multiple independent load controllers distributed across different loads (water heaters, air conditioners, etc.). Each controller independently monitors local voltage and adjusts its connected load, replacing the single centralized generation-side control with multiple distributed control units.
Solution Approach 2:
Each load controller autonomously monitors its local voltage conditions and automatically adjusts the connected load without requiring centralized coordination. The controllers self-organize to collectively maintain voltage within acceptable ranges, with each unit making independent decisions based on local measurements.
2Speed
If distributed loads are used to provide voltage support, then response time decreases, but device complexity increases
Solution Approach 1:
The load controllers are designed with universal functionality to handle multiple load types (water heaters, air conditioners, etc.) through a single control architecture. Each controller can manage different appliances with varying power ratings and operational characteristics using the same voltage monitoring and adjustment mechanism.
Solution Approach 2:
The system adjusts voltage by changing the operational parameters of connected loads, specifically modulating power draw levels. Controllers vary the duty cycle or power level of loads to provide voltage support, transforming load operational parameters into a control mechanism for voltage stabilization.
3Reliability
If loads are triggered to increase power draw during overvoltage, then voltage support is provided, but energy consumption increases
Solution Approach 1:
The load controllers operate in periodic cycles, alternating between normal operation and voltage support modes. During overvoltage conditions, loads are temporarily activated to provide support, then deactivated when voltage normalizes. This periodic on-off operation provides voltage support only when needed, minimizing unnecessary energy consumption.
Solution Approach 2:
The controllers detect voltage excursions and trigger counteracting load adjustments to oppose the voltage deviation. When overvoltage is detected, additional loads are activated to absorb excess voltage; when undervoltage occurs, loads are reduced to prevent further voltage drop, creating a preemptive counter-action to maintain voltage stability.
Data Source
AI summary
Loads on a distribution circuit are operated, which causes the loads to consume electricity delivered to the loads via the distribution circuit. A circuit voltage of the distribution circuit is measured. An excursion of the measured circuit voltage outside of a normal operating voltage range is responded to by triggering a sub-set of the loads on the distribution circuit to increase or decrease their power draw to counter the excursion. For an overvoltage condition, the responding comprises triggering a sub-set of the loads on the distribution circuit to operate, or increase their power draw, in order to reduce the circuit voltage. For an undervoltage condition, the responding comprises triggering a sub-set of the loads on the distribution circuit to cease operating, or reduce their power draw, in order to increase the circuit voltage.