Wind Farm Frequency Regulation via Reactive Compensation
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Solution Overview
Problem
Conventional wind power test and control methods fail to provide continuous and stable voltage, and ineffective frequency regulation due to the unstable nature of wind power generation and lack of synchronization among distributed wind power units in a wind farm.
Innovation Solution
A test and control apparatus and method that includes a processor card connected to communication interfaces for receiving frequency regulation instructions and operation information from a grid scheduling server, calculating the frequency regulation capability of wind power generation units without using energy storage batteries, and sending instructions directly to the units when their capability meets the requirements, thereby avoiding battery usage and enhancing reliability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If virtual synchronous generator is used to synchronize distributed wind power, then synchronization capability is improved, but voltage stability deteriorates because the virtual synchronous generator requires strict sustained and stable voltage which wind power cannot provide
Solution Approach 1:
The patent introduces a reactive compensation device as an intermediary component between the wind power generation unit and the grid. This device actively compensates for reactive power, serving as a mediator that stabilizes voltage without requiring the wind power itself to be stable. The reactive compensation device decouples the voltage stability requirement from the unstable wind power source, enabling the virtual synchronous generator to function properly.
Solution Approach 2:
The patent changes the operating parameters of the wind power generation unit by dynamically adjusting reactive power output through the reactive compensation device. Instead of requiring the wind power voltage to be stable, the system actively modifies the reactive power parameter to achieve voltage stabilization, allowing the system to meet the virtual synchronous generator's requirements despite wind variability.
2Productivity
If energy storage battery is started to provide frequency regulation, then frequency regulation capability is improved, but system complexity and energy loss increase
Solution Approach 1:
The patent enables the wind power generation unit to perform frequency regulation on its own without requiring external energy storage batteries. The wind power unit utilizes its own operational flexibility and control capabilities to provide frequency regulation services, making the system self-sufficient and eliminating the need for additional complexity from battery systems.
Solution Approach 2:
The patent extracts the frequency regulation function from the traditional energy storage battery system and transfers it to the wind power generation unit itself. By removing the battery component from the frequency regulation chain and endowing the wind power unit with direct frequency regulation capability, the system achieves the same function with reduced complexity.
3Productivity
If energy storage battery is used for frequency regulation, then frequency regulation effectiveness is improved, but energy consumption increases
Solution Approach 1:
The wind power generation unit performs frequency regulation using its own operational capacity without requiring energy from external storage batteries. This self-service approach eliminates the energy losses associated with charging and discharging battery systems, as the frequency regulation is achieved directly through control of the wind power unit's output.
Data Source
AI summary
A test and control apparatus, system and method for a wind farm, are provided. The test and control apparatus includes a first communication interface, a second communication interface, and a processor card. The processor card receives, via the first communication interface, a frequency regulation instruction issued by the grid scheduling server, receives operation information of the wind power generation unit via the second communication interface, and calculates, based on the operation information of the wind power generation unit, a first frequency regulation capability of the wind power generation unit performing a frequency regulation without using the first energy storage battery. The processor card sends the frequency regulation instruction to the wind power generation unit without using the first energy storage battery, in a case that the first frequency regulation capability of the wind power generation unit satisfies a requirement of the frequency regulation instruction.