HVDC Static Compensator Harmonic Control
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Solution Overview
Problem
Conventional HVDC systems generate harmonic waves and consume invalid power, with existing harmonic wave filters and power compensators lacking suitable association with HVDC systems and exhibiting unstable control performance.
Innovation Solution
A static compensator apparatus for HVDC systems, including a static compensator, a controller, and a diesel power generator, which calculates phase voltage and fundamental wave phase using FFT, generates Q and H command values, and controls semiconductor devices to remove harmonic waves and compensate for invalid power, ensuring high-speed harmonic wave compensation and system stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a passive filter is used to remove harmonic waves, then the filter structure is simple, but the filter parameters fluctuate due to degradation and system impedance is not known exactly, causing reduced stability
Solution Approach 1:
The patent replaces the passive mechanical filter system with an active filter system that uses electronic switching elements (IGBTs) and control circuits. This substitution allows for precise control of filter parameters through software algorithms rather than relying on fixed physical components, thereby maintaining simplicity while improving stability through active parameter adjustment based on real-time system conditions.
Solution Approach 2:
The patent implements a feedback control mechanism where the actual system impedance and harmonic wave characteristics are continuously measured, and the filter parameters are dynamically adjusted based on this feedback. The control system uses the measured impedance information to optimize the active filter's performance, ensuring stable operation even when system conditions change over time.
2Reliability
If an active filter is used to remove harmonic waves, then the control performance is improved, but the device complexity increases due to switching elements and control circuits
Solution Approach 1:
The patent designs the active filter to perform multiple functions simultaneously: harmonic wave removal, system impedance measurement, and adaptive parameter adjustment. By integrating these functions into a single unified system, the patent avoids the need for separate dedicated devices for each function, thereby reducing overall device complexity while maintaining high control performance.
Solution Approach 2:
The patent implements a self-adjusting control system that automatically measures system impedance and adjusts filter parameters without requiring external intervention or complex manual configuration. The system uses built-in sensors and control algorithms to autonomously optimize its performance, reducing the need for additional external control devices and simplifying the overall system architecture.
3Measurement precision
If a STATCOM is used to compensate invalid power, then the control precision is improved, but the association with HVDC system is not suitable and control performance is not secure
Solution Approach 1:
The patent dynamically adjusts control parameters based on the operating mode of the HVDC system. During normal operation, the system uses one set of control parameters optimized for high precision, while during startup or special conditions, it switches to a different parameter set that ensures stable and secure control performance. This adaptive parameter change allows the system to maintain both precision and security across different operating conditions.
Solution Approach 2:
The patent implements a dynamic control system that adapts its characteristics based on real-time system conditions. The control algorithm continuously monitors system state and adjusts its behavior accordingly, transitioning between different control strategies to maintain both precision and security. This dynamic adaptation ensures that the STATCOM remains appropriately associated with the HVDC system under all operating conditions.
Data Source
AI summary
A static compensator apparatus for a HVDC system may control harmonic wave compensation at high passive speed to meet operating characteristics of the HVDC system. A static compensator is turned-on in a normal mode and compensates for invalid power and removes a harmonic wave generated by the high voltage direct current system. A static compensator controller controls an operation of the static compensator. A diesel power generator operates complementarily to the static compensator and being turned-on when the high voltage direct current system starts.