Compensation Circuitry for Synchronous Machine Instability
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Solution Overview
Problem
Synchronous machines in power grids face instability issues due to transient angular conditions and voltage fluctuations, leading to loss of synchronism and voltage instability, which existing technologies struggle to address effectively.
Innovation Solution
A compensation system incorporating compensation circuitry and a control system that engages or disengages thyristor-controlled series compensation circuitry to stabilize power systems by adjusting reactive power demand and maintaining steady-state conditions, thereby enhancing both angular and voltage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronous machines operate in power grids subject to transient angular conditions and voltage fluctuations, then power generation and transmission continue, but angular instability and voltage instability occur leading to loss of synchronism
Solution Approach 1:
The patent introduces a compensating device as an intermediary element between the synchronous machine and the power grid. This device includes compensation winding means that generate compensating magnetic fields to counteract the effects of transient angular conditions and voltage fluctuations, thereby maintaining synchronization stability without requiring fundamental changes to the synchronous machine structure.
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting the excitation current to the compensating winding means based on detected instability conditions. The control means monitors angular position and voltage parameters, and modifies the compensation winding current parameters in real-time to counteract instability and maintain synchronism.
2Reliability
If synchronous machines operate in power grids subject to transient angular conditions and voltage fluctuations, then power generation and transmission continue, but voltage instability occurs leading to loss of synchronism
Solution Approach 1:
The compensating device serves as an intermediary that directly addresses voltage instability by generating compensating magnetic fields through the compensation winding means. This intermediary action stabilizes voltage levels during transient conditions without requiring changes to the main power generation equipment.
Solution Approach 2:
The patent implements feedback control through the control means that continuously monitors voltage parameters and angular position of the synchronous machine. Based on this feedback information, the control means adjusts the current to the compensation winding means to counteract voltage instability and maintain synchronism.
3Reliability
If existing technologies are used to address instability, then some stabilization may be achieved, but effectiveness is insufficient to prevent loss of synchronism under transient conditions
Solution Approach 1:
The patent introduces a compensating device as an intermediary element between the synchronous machine and the power grid. This device includes compensation winding means that generate compensating magnetic fields to counteract the effects of transient angular conditions and voltage fluctuations, thereby maintaining synchronization stability without requiring fundamental changes to the synchronous machine structure.
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting the excitation current to the compensating winding means based on detected instability conditions. The control means monitors angular position and voltage parameters, and modifies the compensation winding current parameters in real-time to counteract instability and maintain synchronism.
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
The solution effectively reduces angular instability during transient events and steady-state conditions, increases voltage stability, and improves generator efficiency by dynamically managing reactive power, thereby preventing 'out of step' conditions and maintaining stable operation.
Implementation Method 1
asserting or deasserting a signal at a gate of a thyristor of a thyristor-controlled series compensation circuitry
Implementation Method 2
calculating I2*(XL−XC) with I being the current through a line of the power system from the generator to the load, XL being the inductive reactance of the line, and XC being the capacitive reactance of the compensation circuitry
Data Source
AI summary
Methods and systems for stabilizing a power system include receiving a set point for a power system that includes the compensation circuitry controlled by the control system. A firing angle for the power system is set based at least in part on the set point. An angle between a generator terminal of a generator of the power system and a bus of the power system is calculated. A determination is made whether the angle is within a threshold value of the firing angle. When the angle is not within the threshold value of the firing angle, compensation circuitry is engaged to stabilize the power system.