DC Controllable Load Frequency Modulation Without Reactive Compensation
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Solution Overview
Problem
The existing frequency modulation methods for power systems, particularly in high-voltage plants, are cumbersome and less safe due to the need for reactive compensation and expanded failure ranges when using Alternating Current (AC) controllable loads, especially with the integration of wind power and energy storage into the grid.
Innovation Solution
A system and method utilizing a Direct Current (DC)-controllable load with a centralized rectifier for frequency modulation in high-voltage plants, allowing for uniform adjustment of load power in response to frequency modulation commands, improving safety and simplifying the modulation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If AC controllable load is used for frequency modulation, then frequency modulation capability is achieved, but device complexity increases due to reactive compensation requirements
Solution Approach 1:
The patent extracts the reactive compensation requirement from the frequency modulation system by switching from AC controllable load to DC controllable load. The DC load controller directly controls active power consumption without generating reactive power, thereby eliminating the need for separate reactive compensation devices and simplifying the overall system structure.
Solution Approach 2:
The patent replaces the AC power system with a DC power system for load control. By using a DC controllable load instead of an AC controllable load, the system avoids the complexities of AC reactive power management while maintaining the ability to adjust active power consumption for frequency modulation purposes.
2Adaptability or versatility
If AC controllable load is used for frequency modulation, then frequency modulation capability is achieved, but reliability decreases due to expanded failure ranges
Solution Approach 1:
The patent removes the reactive compensation subsystem from the frequency modulation system, thereby extracting the source of expanded failure ranges. The DC controllable load system has fewer subsystems and components, which directly reduces the potential failure points and improves overall system reliability.
3Power
If generator set capacity is adjusted for frequency modulation, then power balance is achieved, but device complexity and operational complexity increase
Solution Approach 1:
Instead of adjusting the generator output to achieve power balance, the patent inverts the approach by adjusting the load consumption. The DC controllable load actively modifies its power consumption to match the generator output, thereby achieving frequency modulation through load-side control rather than generation-side control.
Solution Approach 2:
The DC controllable load system performs self-adjustment of power consumption based on frequency deviation signals. The load controller automatically regulates the load to maintain power balance, eliminating the need for complex generator set capacity adjustment mechanisms and operational procedures.
4Power
If user load is cut off for frequency modulation, then power balance is achieved, but ease of operation deteriorates due to load shedding
Solution Approach 1:
The patent implements dynamic load adjustment instead of static load shedding. The DC controllable load can continuously and smoothly adjust its power consumption level according to frequency deviation magnitude, providing flexible and gradual control rather than abrupt on/off switching, thereby improving operational ease and user experience.
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 DC-controllable load system enhances the safety and simplicity of frequency modulation by enabling precise and efficient power adjustments without the need for additional reactive compensation, reducing failure risks and maintaining stable power supply quality.
Implementation Method 1
a centralized rectifier configured to adjust power of loads in the DC-controllable load for the high-voltage plant in response to a frequency modulation command
Data Source
AI summary
The system for frequency modulation based on Direct Current (DC) controllable load for a high-voltage plant includes a frequency modulator and a DC-controllable load for the high-voltage plant connected to the frequency modulator. The frequency modulator includes a centralized rectifier configured to adjust power of loads in the DC-controllable load in response to a frequency modulation command. The DC-controllable load is configured to respond to an adjustment of the power of loads performed by the centralized rectifier.