E-STATCOM Power Absorption Device for AC Grid Balancing
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Solution Overview
Problem
The limited energy and power capacity of static synchronous compensators (E-STATCOMs) due to fixed energy storage, such as batteries and super-capacitors, poses challenges in stabilizing AC power transmission systems, especially with the increasing reliance on renewable energy sources like solar and wind power plants.
Innovation Solution
An arrangement comprising a static synchronous compensator device with a converter unit, energy storage unit, and a power absorption device, controlled by a control device to manage power exchange and active power absorption beyond the capacity of the energy storage unit using a resistor unit and current control unit, allowing for additional power dissipation when needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the energy storage capacity of E-STATCOM is increased to improve power absorption capability, then the active power absorption capability is improved, but the physical size and cost increase significantly
Solution Approach 1:
The power absorption function is segmented between two devices: the E-STATCOM handles reactive power and base active power absorption through its energy storage unit, while the separate power absorption device (resistive load) handles excess active power absorption. This segmentation allows each device to be optimized for its specific function, avoiding the need to oversize the energy storage unit for peak power absorption demands.
Solution Approach 2:
The power absorption device acts as an intermediary element that complements the E-STATCOM's power absorption capability. When the energy storage unit reaches its charge limit, the power absorption device provides an additional pathway for absorbing excess active power from the grid, effectively extending the overall power absorption capacity without increasing energy storage volume.
2Power
If further E-STATCOMS are added or built larger to increase power absorption capacity, then the active power absorption capability is improved, but the cost and physical size limits are reached
Solution Approach 1:
The power absorption device serves multiple functions: it absorbs excess active power when the energy storage unit is fully charged, provides backup power absorption capability, and can be integrated with the existing E-STATCOM control system. This multi-functionality maximizes the utility of the additional device while avoiding redundant capabilities.
Solution Approach 2:
The power absorption device uses resistive loads that are simpler, cheaper, and more compact than equivalent energy storage systems. While resistors dissipate energy rather than storing it, they provide an effective solution for temporary excess power absorption without the high costs and physical constraints of scaling up energy storage capacity.
3Productivity
If the energy storage unit absorbs power faster to meet high power demand, then the power absorption rate is improved, but the energy storage unit may not be capable of absorbing power fast enough
Solution Approach 1:
The control system dynamically switches between two power absorption modes: the E-STATCOM absorbs power during normal operation, and the power absorption device is activated when the energy storage unit reaches its charge limit or cannot absorb power fast enough. This dynamic configuration ensures the system can continuously meet power absorption demands at the required rate without overloading the energy storage unit.
Solution Approach 2:
The power absorption device is pre-configured and ready to be activated when needed. The control system monitors the state of charge and absorption rate of the energy storage unit, and proactively engages the power absorption device before the energy storage unit becomes overloaded or unable to meet absorption demands, ensuring continuous reliable operation.
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
Enhances power balancing in AC power transmission systems by extending active power absorption capabilities beyond the energy storage limits, providing a backup and stabilizing frequency, even during high power demand scenarios.
Implementation Method 1
active power will be dissipated by means of the power absorption device
Data Source
AI summary
An arrangement, which is connectable to an alternating current (AC) power transmission system, comprising a static synchronous compensator device having a converter unit and an energy storage unit connected with the converter unit; a power absorption device; and a control device connected with the static synchronous compensator device and with the power absorption device. The control device is configured to control the static synchronous compensator device to exchange power with the AC power transmission system, and to control the power absorption device in dependence of a state of charge of the energy storage unit and a state of the power transmission system. The control device is configured to determine whether there is a need to absorb active power from the AC power transmission system in excess of what the static synchronous compensator device is absorbing and, in case of a need, control the power absorption device to absorb active power.