Synchronous Machine Field Control for Grid Voltage Stability
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Solution Overview
Problem
The increasing reliance on renewable energy sources, such as photovoltaic and wind power, leads to fluctuations in power system voltage and reactive power, compromising the overall voltage maintaining ability of the power system, as conventional power generation plants lack the necessary voltage regulation capabilities, and existing solutions like enhancing equipment capacity are costly and ineffective.
Innovation Solution
A magnetic field control device and method for synchronous machines, which adjusts the control constants of the magnetic field control system based on the magnitude of the magnetic field current or its equivalent, such as power factor and reactive power, to stabilize and regulate the voltage within the power system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If renewable energy sources (photovoltaic and wind power) are increased in the power system, then the power system's clean energy supply is improved, but the voltage maintaining ability of the power system deteriorates due to fluctuations in output
Solution Approach 1:
The patent applies dynamics by making the control constants (proportional gain and integral gain) of the magnetic field control system variable rather than fixed. The control constants are dynamically adjusted based on the magnetic field current magnitude to adapt to fluctuating power system conditions caused by renewable energy variations, thereby maintaining voltage stability while accommodating high renewable energy penetration
Solution Approach 2:
The patent changes the parameters of the magnetic field control system by varying the control constants (proportional gain and integral gain) according to the magnetic field current magnitude. This parameter adjustment allows the system to optimize its response characteristics under different operating conditions, resolving the contradiction between accommodating renewable energy fluctuations and maintaining voltage stability
2Device complexity
If the control constants of the magnetic field control system are fixed, then the system structure is simple, but the response speed and stability deteriorate under fluctuating power system conditions
Solution Approach 1:
The patent transforms the static control system into a dynamic one by introducing variable control constants that adapt to changing operating conditions. The control constants are adjusted based on magnetic field current magnitude, enabling the system to respond quickly and stably to power system fluctuations without requiring complex additional hardware
3Speed
If the control constants of the magnetic field control system are increased to improve response speed, then the response speed is improved, but the system stability deteriorates due to oscillations
Solution Approach 1:
The patent resolves this contradiction by making the control constants dynamic rather than fixed at high values. The proportional gain and integral gain are adjusted based on magnetic field current magnitude, allowing the system to achieve fast response when needed while maintaining stability by reducing gain when appropriate, thus avoiding oscillations
Solution Approach 2:
The patent changes the control parameters (proportional gain and integral gain) according to the operating conditions represented by magnetic field current magnitude. This parameter adaptation allows the system to optimize the trade-off between response speed and stability, achieving both fast response and system stability under varying conditions
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 approach provides a stable and quick magnetic field control, effectively addressing the fluctuations and maintaining voltage stability in power systems, even with high renewable energy penetration, by dynamically adjusting control gains and time constants in the magnetic field control system.
Implementation Method 1
a magnetic field control system operating electric current flowing through a magnetic field coil of the synchronous machine
Data Source
AI summary
The present invention provides a magnetic field control device and a magnetic field control method for a synchronous machine, which can fundamentally cope with the problem of the lack and fluctuation in the voltage maintaining ability from a point of view of a power generation of a power system. A magnetic field control device of the present invention is a device for a synchronous machine that controls a magnetic field of the synchronous machine connected to a power system. The magnetic field control device comprises a magnetic field control system operating electric current flowing through a magnetic field coil of the synchronous machine; a regulator of the magnetic field control system; and a compensation circuit variably regulating a control constant of the magnetic field control system according to a magnitude of magnetic field current or an equivalent of the magnetic field current.