Shared Integrator Control Channels for Stable Power System Transitions
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Solution Overview
Problem
Existing control systems for power systems, such as microgrids, experience transient fluctuations and transients during transitions between multiple PID controllers, leading to equipment damage, contractual breaches, and increased time consumption due to complex initialization processes.
Innovation Solution
A control system with multiple control channels sharing a single integrator, allowing seamless transitions without initialization, maintaining independent gain sets, and avoiding significant transients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple independent PID controllers are used to control different functions (frequency control and power control), then each controller can be independently tuned with separate gain sets, but transient fluctuations occur during transitions between controllers causing equipment damage and contractual breaches
Solution Approach 1:
The patent merges multiple independent PID controllers into a single unified controller that can handle both frequency control and power control functions. This is achieved by integrating the control algorithms and sharing the integrator state, allowing seamless transitions without the transient fluctuations that occur when switching between separate controllers. The unified controller maintains independent gain sets for different functions while eliminating the harmful transients during mode transitions.
2Adaptability or versatility
If separate integrators are used in each PID controller to maintain independent control, then each controller can operate autonomously, but complex initialization logic is required to avoid transients during controller transitions
Solution Approach 1:
The patent combines multiple separate integrators into a single shared integrator that serves all PID controllers. This shared integrator maintains a unified state that is accessible to all control functions, eliminating the need for complex initialization logic during transitions. The integrator state is preserved and shared across different control modes, allowing seamless switching without requiring pre-transition initialization procedures.
3Reliability
If initialization logic is implemented to prevent transients during controller transitions, then equipment damage is avoided, but engineering time and transition time are significantly increased
Solution Approach 1:
The patent prepares the control system in advance by establishing a unified integrator state that is valid for all control modes before transitions occur. This preliminary setup ensures that when a transition between frequency control and power control is needed, the integrator state is already properly configured, eliminating the need for time-consuming initialization procedures during the actual transition moment.
4Reliability
If additional initialization logic is added to PID controllers to avoid transients, then transition stability improves, but controller complexity and communication requirements increase
Solution Approach 1:
The patent simplifies the overall controller structure by merging multiple independent PID controllers with separate integrators into a single unified controller with a shared integrator. This consolidation reduces the complexity of initialization logic and communication requirements while maintaining transition stability, as the shared integrator naturally provides consistent state information across all control functions without requiring additional synchronization mechanisms.
Data Source
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AI summary
Embodiments of the present disclosure provide a control system (100) for controlling unit of a power system (1000). The control system (100) comprises at least two control channels (102) with different control targets. Each control channel (102) of the at least two control channels (102) is arranged to perform one or more control operations for controlling the unit of the power system (1000). Further, at least one control operation is performed as a response to a respective input signal received from the power system (1000). Each of the at least two control channels (102) is connected to a merged control output to the unit of the power system (1000) through a shared integrator (104).