Distributed Power Control Using Local Frequency-Rate Feedback
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Solution Overview
Problem
Existing battery control systems struggle to perform high-speed control of active power from distributed power sources, leading to potential frequency decreases and increased risks of large-scale power failures.
Innovation Solution
A distributed-power-source control system that includes a central operation unit for simulating system responses and calculating f-change-rate control parameters, and a distributed-power-source control apparatus for measuring f change rates and controlling active power output based on these parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If control commands are transmitted through a communication network, then system coordination is achieved, but control speed decreases
Solution Approach 1:
The system divides control functions into two segments: f-change-rate measurement and active power control are performed locally at the distributed power source without communication network involvement, while only parameter setting and simulation are performed centrally. This segmentation eliminates communication delays in the critical control path, achieving high-speed control without requiring high-speed communication networks.
2Reliability
If active power control is delayed, then system stability is maintained, but frequency decrease cannot be prevented
Solution Approach 1:
The system implements local feedback control by measuring the f-change-rate at the distributed power source terminal and immediately adjusting active power output based on this measurement. This closed-loop feedback mechanism ensures that control actions are taken in real-time to prevent frequency decrease, achieving both fast response and frequency stability simultaneously.
Solution Approach 2:
The central operation unit performs simulation of system response beforehand to calculate appropriate f-change-rate control parameters. These pre-calculated parameters are then used by the distributed power source for immediate control action when disturbance occurs, enabling fast response without requiring real-time complex calculations.
3Quantity of substance
If renewable energy power sources are increased, then clean energy supply is improved, but system inertia decreases
Solution Approach 1:
The system changes the operational parameters of distributed power sources by enabling them to perform frequency change rate control. This parameter change allows renewable energy sources to actively participate in frequency stabilization, compensating for the loss of system inertia caused by their increased penetration without requiring synchronous generators.
Data Source
AI summary
An object of the present disclosure is to control active power of a distributed power source at high speed in a distributed-power-source control system. A central operation unit includes an f-change-rate control parameter operation unit that calculates an f-change-rate control parameter from a simulation result of a response operation unit. A distributed-power-source control apparatus includes an f-change-rate measurement unit that measures an f change rate of an own terminal, an f-change-rate controlled variable operation unit that sets, as an f-change-rate controlled variable, active power corresponding to the f change rate of the own terminal in the f-change-rate control parameter, and a power converter that controls active power output from the distributed power source to a transmission and distribution system, based on an active power controlled variable determined based on the f-change-rate controlled variable.