Reactive Power Control in Transmission Networks
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Solution Overview
Problem
Existing methods for reducing power losses and stabilizing voltage in electric networks, such as Flexible AC Transmission Systems (FACTS), primarily focus on critical network parameters like voltage stabilization and power system stability rather than energy savings, and are not effective in relieving reactive power flow, which contributes to significant energy losses.
Innovation Solution
A method involving the use of magnetically controlled shunt reactors (MCSR) to absorb excess reactive power and automatic capacitor banks (ACB) to generate additional reactive power, controlling reactive power flow across different voltage levels in the network to reduce power losses and stabilize voltage, specifically targeting high and medium voltage levels in transmission networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reactive power control techniques (FACTS) are applied to stabilize voltage and improve power system stability, then voltage stabilization and power system stability are improved, but power losses reduction is not the primary focus and energy savings are limited
Solution Approach 1:
The invention divides the transmission network into multiple segments with separate reactive power control devices at different locations. Instead of using centralized FACTS devices, the system implements distributed reactive power compensation by segmenting the network and controlling each segment independently, which directly addresses power losses in each zone while maintaining overall system stability.
Solution Approach 2:
The invention inverts the conventional approach by making power losses reduction the primary objective rather than treating it as a secondary effect. The reactive power control is specifically designed and optimized to minimize I²R losses by relieving reactive power flow, rather than focusing primarily on voltage stabilization as the main goal.
2Stress or pressure
If reactive power is injected at a specific node to raise voltage, then voltage at that node is improved, but reactive power flow is not effectively relieved and power losses are not significantly reduced
Solution Approach 1:
The invention applies local quality by implementing reactive power control devices at specific locations where they can most effectively relieve reactive power flow and reduce losses. Each control device is strategically positioned to address local reactive power imbalances, creating different control characteristics at different network locations rather than uniform voltage support throughout the system.
Solution Approach 2:
The invention adds the dimension of reactive power flow relief to the traditional voltage control approach. Instead of merely injecting reactive power to raise voltage at a node, the system coordinates multiple control devices to simultaneously achieve voltage support and reactive power flow reduction, operating in both voltage magnitude and reactive power flow dimensions.
3Stress or pressure
If reactive power flow is maintained to support voltage levels, then voltage stability is improved, but power losses increase due to heat dissipation from live current flow
Solution Approach 1:
The invention changes the operating parameters of the transmission network by dynamically adjusting reactive power injection/absorption to optimize the balance between voltage support and losses reduction. The control devices modify network parameters such as power factor and reactive power flow magnitude to achieve minimum losses while maintaining acceptable voltage levels.
Solution Approach 2:
The system implements feedback control by continuously monitoring voltage levels, reactive power flow, and power losses, then adjusting the reactive power control devices accordingly. The feedback mechanism allows the system to automatically optimize the trade-off between voltage support and losses reduction based on real-time network conditions.
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
This approach effectively reduces power losses, improves power factor, stabilizes voltage, and increases the lifespan of network elements by minimizing reactive power flow and associated heat dissipation, while also reducing greenhouse gas emissions and operational costs.
Implementation Method 1
the reactive power absorber is a magnetically controlled shunt reactor (MCSR)
Implementation Method 2
the reactive power generator is an automatic capacitor bank (ACB)
Data Source
AI summary
There is provided a method of stabilizing the voltage and reducing power losses in an electric network having a flow of live current and a flow of reactive power, the method comprising reducing the flow of live current by controlling the flow of reactive power within the network. There is also provided an electric network node having a first load point and a second load point, the second load point being at a lower load level than the first load point, the node comprising a reactive power absorber at the first load point and a reactive power generator at the lower load point. An electric network comprising a first substation comprising a first load bus-bar having a first voltage and a second load bus-bar having a second voltage lower than the first voltage; second substations in connection with the first substation, each one comprising a third load bus-bar having a third voltage equal to the second voltage and a fourth load bus-bar having a fourth voltage lower than the third voltage; a reactive power absorber connected to the second load bus-bar; and for each one of the second substations, a reactive power generator connected to the fourth bus-bar.