Distributed Generators for On-Demand VAr Compensation
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Solution Overview
Problem
Current power grid infrastructure faces challenges in managing reactive power, as existing technologies do not effectively utilize distributed renewable generators for on-demand Volt-Ampere reactive (VAr) compensation, leading to inefficiencies and penalties for large users.
Innovation Solution
A method and apparatus that utilize distributed generators (DGs) equipped with DC/AC inverters, controlled by a network of controllers and gateways, to generate reactive power commensurate with peak requests, allowing for on-demand VAr compensation by converting DC power from renewable sources into AC power in phase with the grid voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If distributed generators are prohibited from generating reactive currents according to existing standards, then utility control over reactive power is maintained, but the ability to provide on-demand VAr compensation is lost
Solution Approach 1:
The patent enables distributed generators to dynamically switch between real power generation and reactive power compensation modes based on grid conditions and utility requests. The inverter control system can adaptively adjust the power factor and reactive current output in real-time, transforming static DG functionality into a dynamic, on-demand VAr compensation resource that responds to utility needs while maintaining grid stability.
2Reliability
If utilities deploy traditional VAr compensators at substations and large customer facilities, then reactive power compensation is provided, but infrastructure cost and complexity increase
Solution Approach 1:
The patent transforms distributed generators from single-function real power sources into multi-functional units that can simultaneously or alternately provide real power generation and reactive power compensation. This eliminates the need for separate dedicated VAr compensators at multiple locations, as existing DG infrastructure with modified inverter control can serve dual purposes, reducing overall system complexity and infrastructure requirements.
Solution Approach 2:
The patent enables distributed generators to self-adjust their reactive current output based on local grid conditions and utility requests received through communication networks. Each DG unit autonomously monitors voltage levels, power factor requirements, and utility demands, then automatically adjusts its inverter output to provide VAr compensation without requiring centralized control of traditional compensator banks, simplifying the overall control architecture.
3Productivity
If distributed generators convert DC power to AC power in phase with grid voltage, then on-demand reactive power is generated, but inverter control complexity increases
Solution Approach 1:
The patent implements feedback control loops in the inverter system that continuously monitor grid voltage, current, and power factor conditions. The controller receives utility requests and local measurements, adjusts the inverter switching patterns and DC-to-AC conversion parameters accordingly, and verifies the resulting reactive power output. This closed-loop feedback mechanism automates the complex control tasks, making the system adaptable to varying conditions without requiring overly complex manual control architecture.
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 enables efficient on-demand VAr compensation, reducing grid instability, minimizing penalties for users, and optimizing the use of existing infrastructure by allowing DGs to actively manage reactive power, thereby enhancing grid stability and utilization.
Implementation Method 1
utilizing the control signal to drive a DC/AC inverter to generate the reactive power
Data Source
AI summary
A method and apparatus for generating on-demand power. The method comprises receiving a peak reactive current request, generating a control signal based on the peak reactive current request, and utilizing the control signal to drive a DC/AC inverter to generate reactive power commensurate with the peak reactive current request.