Power Plant Frequency Control via Steam Valve and Fuel Adjustment
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Solution Overview
Problem
Energy storage systems (ESS) fail to control frequency when overcharged or over-discharged, leading to unstable power supply and potential power outages, as they cannot effectively manage power distribution when the charge amount is less than or equal to a reference charge amount.
Innovation Solution
A frequency control apparatus and method that adjusts the power supply to consumers by controlling the opening degree of a steam valve and fuel quantity in a power plant, increasing the power supply when the frequency is low and the ESS charge is insufficient, thereby stabilizing the frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ESS charge amount is less than or equal to a reference charge amount, then the ESS cannot control frequency, but increasing power plant output to compensate requires additional control mechanisms
Solution Approach 1:
The control device continuously monitors the charge amount of the ESS and the frequency of the power system. When the ESS charge amount is less than or equal to a reference charge amount, the control device activates additional control of the power plant output to compensate for the ESS's inability to perform frequency control, ensuring continuous frequency stability through feedback-based adaptive control.
Solution Approach 2:
The control device proactively detects when the ESS charge amount falls below the reference threshold before frequency control failure occurs. By提前 activating power plant output control in this preliminary state, the system prevents frequency instability rather than reacting after the problem manifests.
2Reliability
If the ESS is overcharged or over-discharged, then frequency control function is lost, but maintaining ESS within safe charge limits reduces operational flexibility
Solution Approach 1:
The control device continuously monitors the ESS charge amount and compares it against reference thresholds. When the charge amount approaches unsafe limits (overcharged or over-discharged states), the control device adjusts power plant output to compensate, allowing the ESS to operate near its full capacity range while maintaining frequency control capability through active power plant involvement.
Solution Approach 2:
The power plant acts as an intermediary system that compensates for ESS operational constraints. When the ESS charge amount is limited by overcharge or over-discharge conditions, the power plant adjusts its output to maintain frequency control, effectively mediating between the ESS's operational limits and the power system's frequency stability requirements.
3Reliability
If the ESS cannot perform frequency control due to charge amount constraints, then consumer frequency control becomes impossible, but adding backup control systems increases system complexity
Solution Approach 1:
The control device performs multiple functions: it manages normal ESS charge-discharge operations, monitors ESS charge amount against reference thresholds, detects when ESS cannot perform frequency control, and activates power plant output control to compensate. This multi-functional approach eliminates the need for separate backup control systems while maintaining consumer frequency control capability.
Solution Approach 2:
The control device merges ESS charge management and frequency control functions into a single integrated system. By combining these functions and adding adaptive power plant control, the system maintains consumer frequency control without requiring separate dedicated backup systems, reducing overall system complexity while ensuring reliability.
Data Source
AI summary
A control device for a power generation system comprising an energy storage system (ESS) and a power plant is provided. The control device includes: a controller configured to compare a supply frequency of a supply power supplied to a consumer with a reference frequency, compare a charge amount of the ESS with a reference charge amount, and control the ESS and the power plant such that the supply power is controlled according to a result of the frequency comparison and a result of the charge amount comparison, an opening degree control device configured to control an opening degree of a steam valve disposed in the power plant by the control of the controller, and a fuel quantity control device configured to control a quantity of fuel injected into the power plant for power generation by the control of the controller.