Wind-Thermal Power Bundling Control for Grid Stability

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Solution Overview

Problem

The integration of wind power and thermal power into the grid faces challenges due to the volatility and randomness of wind resources, leading to instability and inefficiency in power delivery, particularly in regions with rich wind resources where local load is low and power grids are weak, resulting in high transmission costs and reduced system stability.

Innovation Solution

A wind power bundling control method that regulates wind and thermal power output forward or backward, calculates transient stability margins, load level indices, and voltage out-of-limit indices, and adjusts outputs based on a paying value to ensure stable grid operation, using specific formulas to determine optimal wind-thermal power coordination.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If wind power is delivered independently over long distance, then wind power can be transmitted to areas with high demand, but transmission cost increases and system stability deteriorates due to weak power grid and high volatility

Engineering Contradiction:

Improvewind power deliveryVSAvoidsystem stability

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent combines wind power and thermal power into a bundled delivery system. The control method coordinates both power sources to deliver power together through the same transmission channel, which stabilizes the power flow and improves system reliability while utilizing the strong grid connection of thermal power plants to compensate for wind power volatility

Inventive Principle:

Principle #5Merging (Combining)

2Productivity

If wind power output is increased to fully utilize wind resources, then wind power consumption capacity improves, but transmission line fluctuations increase and stability limit is exceeded

Engineering Contradiction:

Improvewind power consumptionVSAvoidtransmission line stability

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The control method continuously monitors the transmission line power fluctuations and adjusts the wind-thermal power mix in real-time. When wind power causes excessive fluctuations, the system automatically increases thermal power output to compensate, and vice versa, thereby maintaining stable transmission line operation while maximizing wind power utilization

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system dynamically changes the output parameters of both wind and thermal power based on real-time grid conditions. By adjusting the proportion of wind and thermal power in the bundled delivery according to stability requirements, the system optimizes wind power consumption while maintaining transmission stability within safety limits

Inventive Principle:

Principle #35Parameter changes

3Productivity

If thermal power output is decreased to increase wind power consumption, then wind power utilization improves, but reserve capacity of the system reduces

Engineering Contradiction:

Improvewind power utilizationVSAvoidsystem reserve capacity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The control method implements dynamic adjustment of thermal power output rather than fixed reduction. Thermal power serves as a flexible reserve that can be quickly increased or decreased based on real-time wind conditions and grid stability requirements, maintaining system reserve capacity while maximizing wind power utilization

Inventive Principle:

Principle #15Dynamics

4Reliability

If wind power and thermal power are bundled for delivery, then transmission channel utilization improves and stability is enhanced, but control complexity increases due to coordinated regulation requirements

Engineering Contradiction:

Improvesystem stabilityVSAvoidcontrol system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The control method manages complexity by focusing on parameter adjustment (power output levels) rather than complex structural changes. Through systematic parameter optimization and coordinated regulation of wind-thermal power mix, the system achieves stable bundled delivery while keeping control mechanisms relatively simple and implementable

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9667066B2Wind power bundling control method after wind power and thermal power are connected to grid

Publication Date: 2017.05.30 STATE GRID CORPORATION OF CHINA

AI summary

The present invention has disclosed a wind power bundling control method after wind power and thermal power are connected to a power grid in the field of electric power system security technology, including regulating wind power output and thermal power output forward or backward; calculating the transient stability margin of the grid, load level index of element and voltage out-of-limit index of busbar after regulating wind power output and thermal power output respectively; calculating wind power/thermal power paying value according to the transient stability margin of the grid, load level index of element and voltage out-of-limit index of busbar after regulating wind power output and thermal power output; if wind power/thermal power paying value is larger than set threshold value, regulating wind power output and thermal power output backward/forward; if wind power/thermal power paying value is smaller than set threshold value, regulating wind power output and thermal power output forward/backward. The present invention provides a wind power bundling control method after wind power and thermal power are connected to the power grid to ensure reasonable output of wind power and thermal power, so as to guarantee the power grid operates normally.