Hybrid TCR and VSC Power Supply Network Voltage Fluctuation Control
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Solution Overview
Problem
Existing compensation systems, such as SVCs and STATCOMs, are inadequate in reducing voltage fluctuations, especially during rapid load changes, and are often costly, with SVCs performing poorly above 10 Hz and STATCOMs being more expensive.
Innovation Solution
A method involving a TCR and VSC, where the current measurement signal is split into frequency components below and above a predetermined limit frequency, with the TCR controlling low-frequency components and the VSC controlling high-frequency components, allowing for dynamic and coordinated reactive power compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an SVC with TCR is used for compensation, then cost is reduced, but voltage fluctuations above 10 Hz cannot be adequately reduced
Solution Approach 1:
The compensation system is segmented into two distinct parts: SVC for low-frequency compensation (0.5-10 Hz) and STATCOM for high-frequency compensation (10-100 Hz). Each device operates independently within its optimized frequency range, allowing the system to handle both slow and rapid load changes effectively without requiring a single expensive high-speed device for the entire range.
Solution Approach 2:
Instead of using a single STATCOM that would be capable of handling all frequency ranges (excessive action), the system uses partial action by deploying SVC for low-frequency and STATCOM for high-frequency components. This partial division allows cost optimization while maintaining comprehensive compensation coverage.
2Reliability
If a STATCOM is used for compensation, then voltage fluctuations are reduced more effectively, but cost increases significantly
Solution Approach 1:
The frequency spectrum is segmented into low-frequency (0.5-10 Hz) and high-frequency (10-100 Hz) ranges, with SVC handling the former and STATCOM the latter. This segmentation allows the expensive STATCOM to be used only where its high-speed response is necessary, rather than deploying it across the entire frequency range.
Solution Approach 2:
The system changes the operating parameters by assigning different frequency response characteristics to different compensation devices. SVC operates optimally at lower frequencies with slower response, while STATCOM handles higher frequencies with faster response, optimizing the overall system performance and cost structure.
3Device complexity
If a single compensation device is used, then device complexity is reduced, but the ability to handle both slow and rapid load changes is compromised
Solution Approach 1:
The compensation function is segmented across two devices with distinct frequency responsibilities. The control system is also segmented, with separate controllers for SVC and STATCOM that receive frequency-filtered versions of the load current signal, enabling each device to operate independently within its optimized range.
Solution Approach 2:
The hybrid compensation system achieves multi-functionality by combining SVC and STATCOM, allowing a single compensation infrastructure to handle both slow and rapid load changes across the entire frequency spectrum (0.5-100 Hz), rather than requiring separate systems for different frequency ranges.
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 efficiently reduces voltage fluctuations across a broader frequency range, optimizing the performance of the compensation system while minimizing costs by leveraging the strengths of both TCR and VSC.
Implementation Method 1
reducing the voltage fluctuations with the aid of a TCR (thyristor controlled reactor), which represents a thyristor-controlled reactance
Implementation Method 2
reducing the voltage fluctuations with the aid of a VSC (voltage source converter), which represents a voltage-controlled converter
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
Voltage fluctuations in a power supply network (2) are to be reduced efficiently and cost-effectively. A method is proposed for this purpose in which a current flowing into a load is measured (16), thereby obtaining a corresponding current measurement signal. The voltage fluctuations are reduced using a TCR (8), which represents a thyristor-controlled reactance, and a VSC (10), which represents a voltage-controlled converter. The current measurement signal, or a corresponding quantity, is divided into a first component and a second component depending on a predefined absolute limit. The TCR (8) is controlled based on the first component, and the VSC (10) based on the second component. Alternatively, the TCR can be controlled by the load current measurement signal, and the VSC by a sum of the load current measurement signal and a TCR current measurement signal.