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control-strategy-designer skill

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This skill designs control strategies for process systems, selecting structures, configuring loops, and optimizing regulatory control for reliable operation.

npx playbooks add skill a5c-ai/babysitter --skill control-strategy-designer

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SKILL.md
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---
name: control-strategy-designer
description: Process control strategy design skill for control structure selection, loop configuration, and regulatory control
allowed-tools:
  - Read
  - Write
  - Glob
  - Grep
  - Edit
  - Bash
metadata:
  specialization: chemical-engineering
  domain: science
  category: Process Control
  skill-id: CE-SK-019
---

# Control Strategy Designer Skill

## Purpose

The Control Strategy Designer Skill develops process control strategies including control structure selection, loop configuration, and regulatory control system design.

## Capabilities

- Control objective identification
- Controlled variable selection
- Manipulated variable pairing
- Control structure synthesis
- Cascade and ratio control design
- Feedforward control design
- Split-range control configuration
- Override and selector control

## Usage Guidelines

### When to Use
- Developing control strategies
- Configuring control loops
- Designing regulatory control
- Evaluating control alternatives

### Prerequisites
- Process P&IDs available
- Control objectives defined
- Process dynamics understood
- Operating modes identified

### Best Practices
- Address controllability early
- Consider all operating modes
- Plan for disturbance rejection
- Document control philosophy

## Process Integration

This skill integrates with:
- Control Strategy Development
- PID Controller Tuning
- Model Predictive Control Implementation

## Configuration

```yaml
control-strategy-designer:
  control-types:
    - feedback
    - feedforward
    - cascade
    - ratio
    - split-range
    - override
  pairing-methods:
    - RGA
    - NI
    - SVD
```

## Output Artifacts

- Control philosophy documents
- Loop diagrams
- Control narrative
- Cause and effect matrices
- Control system specifications

Overview

This skill designs practical process control strategies, guiding selection of control structures, loop configuration, and regulatory control design. It produces control philosophies, loop diagrams, and specifications that align with process objectives and operating modes. The skill emphasizes controllability, disturbance rejection, and clear documentation for handoff to engineers and control vendors.

How this skill works

The skill inspects process objectives, P&IDs, and identified operating modes to select controlled and manipulated variables and generate control pairings. It synthesizes control structures (feedback, feedforward, cascade, ratio, split-range, override) and recommends loop configurations, cascade tuning points, and feedforward paths. Outputs include control narratives, cause-and-effect matrices, and diagram-ready loop specifications for integration with tuning or MPC workflows.

When to use it

  • Developing a new control strategy for a unit or plant
  • Configuring or reworking multiple control loops after process changes
  • Designing regulatory control for varying operating modes or transitions
  • Evaluating alternative pairing and structure options before implementation
  • Preparing deliverables for control engineers and automation vendors

Best practices

  • Assess controllability and identify key disturbances early
  • Consider all operating modes, transitions, and upset conditions
  • Use systematic pairing methods (RGA, NI, SVD) for multivariable interactions
  • Document the control philosophy and cause-and-effect logic clearly
  • Design for graceful handover to tuning and advanced control teams

Example use cases

  • Design cascade control for a heat exchanger train with flow and temperature requirements
  • Create feedforward-plus-feedback control for a level control with frequent inflow disturbances
  • Implement split-range and override logic for a compressor surge protection system
  • Develop control pairing and structure recommendations for a multivariable distillation column
  • Produce loop-by-loop specifications and a control narrative for vendor commissioning

FAQ

What inputs are required to generate a control strategy?

Provide P&IDs, defined control objectives, process dynamics or models, and identified operating modes. These allow variable selection and pairing analysis.

How does the skill handle multivariable interactions?

It recommends pairing using RGA, NI, or SVD methods, suggests decoupling or cascade arrangements, and highlights potential interaction risks for controller placement and tuning.