Distribution Network Frequency Control Using Source-Load-Storage Regulation
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Solution Overview
Problem
Existing emergency frequency regulation methods in power distribution networks are inadequate for long-term load disturbances, as they rely solely on generator tripping or load cutback, which are ineffective beyond small disturbances, leading to potential frequency collapses and power quality issues.
Innovation Solution
An emergency control method based on source-load-storage regulation and cutback, which dynamically adjusts power output by utilizing standby energy-storage power stations and external power supplies to maintain balance between supply and demand, while limiting or cutting back power generating sources and loads as needed, to keep output power and frequency within permissible ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If generator tripping or load cutback is used to maintain frequency, then frequency can be maintained within rated range for small disturbances, but the method becomes ineffective for long-term load disturbances
Solution Approach 1:
The patent implements dynamic adjustment of power generation and load based on real-time frequency deviation. The control system continuously monitors frequency and adjusts the output of controllable power generators and the amount of load cutback dynamically, transitioning from static tripping/cutback to adaptive regulation that responds to the severity and duration of disturbances.
Solution Approach 2:
The patent changes the operational parameters of power generators and loads based on frequency deviation magnitude. When frequency deviates within a first range, partial adjustment is applied; when it deviates within a second range, full adjustment is applied. This parameter-based control enables the system to adapt its response intensity to match the disturbance level.
2Ease of operation
If pure generator tripping or load cutback is applied, then frequency control is simple to implement, but the system cannot handle long-term load disturbances effectively
Solution Approach 1:
The patent segments the frequency control process into distinct stages: frequency monitoring, deviation judgment (first range vs. second range), and corresponding control actions (partial vs. full adjustment). This segmentation maintains operational simplicity by providing clear decision logic while enabling comprehensive handling of both short-term and long-term disturbances through the multi-level control strategy.
3Adaptability or versatility
If controllable power generators and loads are dynamically adjusted, then both small and large disturbances can be handled, but the control system complexity increases
Solution Approach 1:
The patent implements a feedback control mechanism where frequency deviation serves as the feedback signal. The control system continuously monitors frequency, compares it against predefined ranges, and adjusts power generation and load accordingly. This feedback loop enables comprehensive disturbance handling while maintaining manageable complexity through clear feedback thresholds and standardized control responses.
4Reliability
If frequency deviation triggers power adjustment, then power balance can be maintained, but excessive adjustment may cause frequency instability
Solution Approach 1:
The patent applies partial adjustment when frequency deviation is within the first range, and full adjustment when within the second range. This graduated approach prevents excessive adjustment for minor deviations while ensuring adequate response for severe disturbances, thereby maintaining both power balance and frequency stability through proportionate control actions.
Data Source
AI summary
Disclosed are an emergency control method and system based on source-load-storage regulation and cutback. According to the method, output power of power generating sources is regulated according to a power regulating quantity and a frequency regulation requirement, an output power compensation and output frequency of each power generating source are maintained within permissible ranges, so that a balance between power supply and demand of a power distribution network is maintained; and standby energy-storage power stations are used to make up a power gap, and an external power supply system is used to assist in making up a power deficiency, so that large load disturbance can be handled make up the power gap.