Voltage Reactive Power Assisting Device for Renewable Grid Stability
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Solution Overview
Problem
In power systems with increasing renewable energy sources, fluctuations in voltage and power flow lead to challenges in maintaining balance and economic efficiency, requiring operators to expend significant labor in setting reference, target, or setting values for voltage control devices.
Innovation Solution
A voltage/reactive power operation assisting device and monitoring control system that includes databases for storing data, prediction units for forecasting individual control device operations, and display units for comparing predictions with actual data, reducing operator labor by automating the process of setting optimal values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual setting of reference values, target values, or setting values for voltage control devices is performed by operators, then flexibility and adaptability to system changes are maintained, but operator labor and time consumption increase significantly
Solution Approach 1:
The system automatically determines reference values, target values, and setting values for voltage control devices without operator intervention. The determining unit autonomously calculates optimal values based on system conditions, eliminating manual setting operations while maintaining adaptability to system changes through real-time data processing
Solution Approach 2:
The system pre-calculates and stores optimal reference values, target values, and setting values in databases before they are needed. When system conditions change, the system retrieves and applies pre-determined values immediately, avoiding time-consuming manual setting operations while ensuring optimal performance
2Speed
If individual VQC method is used with distributed control at each substation, then high-speed control and compliance with system changes are achieved, but coordination complexity and system setup difficulty increase
Solution Approach 1:
The system divides the power system into multiple substation units, each equipped with individual VQC control devices. Each substation independently determines its own reference values and control parameters, enabling high-speed local control while reducing overall coordination complexity through modular autonomous operation
Solution Approach 2:
The system dynamically adjusts control parameters such as reference values, target values, and setting values based on real-time system conditions. By automatically changing these parameters according to system state, the system maintains high-speed response capability while adapting to various operating conditions without complex manual coordination
3Stability of the object's composition
If central VQC method is used with centralized control, then coordinated control and system-wide optimization are achieved, but control speed and response time to local changes decrease
Solution Approach 1:
The system combines centralized and distributed control approaches by establishing a determining unit that coordinates reference values and target values across the entire power system while allowing individual substations to autonomously execute control actions. This merged approach achieves system-wide voltage balance through coordinated parameter setting while maintaining fast local response speeds
4Adaptability or versatility
If renewable energy sources are increased to improve sustainability, then environmental benefits are achieved, but voltage and power flow fluctuations increase making control more difficult
Solution Approach 1:
The system continuously monitors voltage and power flow conditions in real-time and uses this feedback to dynamically adjust reference values, target values, and setting values for voltage control devices. This feedback mechanism compensates for fluctuations caused by renewable energy variations, maintaining voltage stability while enabling high renewable energy integration
Solution Approach 2:
The system transitions from static to dynamic control by automatically adjusting control parameters in response to changing system conditions caused by renewable energy fluctuations. The determining unit continuously updates reference values and target values based on real-time measurements, enabling the system to adapt to variable renewable energy output while maintaining stable voltage levels
Data Source
AI summary
The setting range of the voltage and the reactive power of a power system is maintained during variations of voltage and power flow due to the output variation of renewable energy of a large number of power supplies which fluctuate due to weather. A voltage/reactive power operation assisting device is provided with a first database for storing the data to be evaluated, target value data, individual control device control method data, and individual control device data of an individual control device for adjusting the voltage/reactive power of a power system. A second database stores the device operation data of the individual control device; and the operation of the individual control device is predicted from the data stored in the first database to obtain individual control device operation prediction data. A display unit displays the individual control device operation prediction data and the device operation data in a contrastive manner.