Generator and SVC Coordinated Control for Unity Power Factor
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Solution Overview
Problem
Existing methods for improving power plant active power throughput, such as installing variable frequency drives and reducing reactive power consumption, are limited in effectiveness due to the need for generalized coordination control of generators and Static Var Compensators (SVCs) that consider various operational factors and ensure accurate, fast response without affecting generator stability.
Innovation Solution
A coordinated control method and controller for generators and SVCs that measure input parameters, determine operation modes based on system topology and SVC control modes, and calculate control references to enable SVCs to share reactive power output, converting the generator into a unity-power-factor-generator and enhancing active power output capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SVC is installed to share reactive power output and convert generator to unity power factor operation, then active power output capability is improved, but control system complexity increases due to need for coordinated control of generator and SVC
Solution Approach 1:
The coordinated control system is segmented into distinct functional modules: a determination module that identifies operation modes based on system topology, and a calculation module that computes control references for generator and SVC. This segmentation allows each module to handle specific tasks independently, reducing overall control complexity while achieving unity power factor operation and improved active power output.
Solution Approach 2:
The control system dynamically adapts to different operation modes (generator-connected-to-busbar, SVC-connected-to-busbar, or SVC-connected-to-generator-terminal) by automatically determining the current mode and adjusting control references accordingly. This dynamic adaptability enables the system to maintain optimal performance across varying operational conditions without requiring complex fixed-structure control.
2Adaptability or versatility
If coordinated control is designed to handle multiple operation modes and system topologies, then adaptability is improved, but control accuracy deteriorates due to difficulty in ensuring generalization across different factors
Solution Approach 1:
The coordinated control system is designed with universal functionality to handle multiple operation modes and system topologies through a unified control framework. The determination module identifies the current operation mode, and the calculation module applies appropriate control strategies for each mode, enabling the system to adapt to various configurations (generator-connected-to-busbar, SVC-connected-to-busbar, SVC-connected-to-generator-terminal) while maintaining control accuracy through standardized calculation methods.
Solution Approach 2:
The control system adjusts operational parameters based on the determined operation mode. By changing control references (active power reference, reactive power reference, voltage reference) according to the specific operation mode, the system achieves accurate control adaptation without requiring completely different control algorithms for each topology, thus maintaining both adaptability and precision.
3Speed
If control references are calculated to ensure fast response speed, then response time is improved, but system stability deteriorates due to potential impact on generator stable operation
Solution Approach 1:
The coordinated control system incorporates feedback mechanisms where the determination module continuously monitors the current operation mode and system state, and the calculation module adjusts control references based on this feedback. This closed-loop approach ensures that fast response actions are taken only when appropriate for the current operational conditions, maintaining generator stability while achieving rapid adaptation to changing load demands and power factor requirements.
Data Source
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AI summary
The present invention provides coordinated control methods of generator and SVC for improving power plant active power throughput and controller thereof. The method comprises: measuring the required input parameters for the generator and SVC control Judging the system topology and the control mode of SVC to determine the operation mode; and calculating the control reference based on the operation mode to control the generator and/or SVC. The proposed methods and coordinated controllers enable the SVC to share the required reactive power output of the power plant, convert the generator into "unity-power-factor-generator", and therefore extend the active power output capability of the power plant.