Reduced order models for grid connected hydropower plants

Reduced order models for grid connected hydropower plants

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This chapter aims at modeling a hydropower plant connected to a power system. A practical engineering approach based on physical models (hydraulic, mechanical and electrical) is proposed. With necessarily a low order, these models are dedicated for generation control design and more particularly for power-frequency controller design.

Chapter Contents:

  • 3.1 Introduction
  • 3.2 Hydropower plant model
  • 3.2.1 Penstock and tunnel models
  • 3.2.2 Surge tank model
  • 3.2.3 Turbine model in a water column
  • Impulse turbine
  • Reaction turbine
  • 3.2.4 Hydraulic circuit model
  • Non-linear model in per unit
  • Linearized model
  • 3.2.5 Mechanical model of the generating unit
  • Non-linear model in per unit
  • Linearized model
  • 3.2.6 Hydro-mechanical model of the power plant
  • 3.3 Synchronous power system models
  • 3.3.1 General model
  • 3.3.2 Model for an interconnected grid
  • 3.3.3 Model for an isolated grid
  • 3.4 Complete state-space model for a hydro plant connected to a grid
  • 3.4.1 General model
  • Hydro-mechanical subsystem
  • Electro-mechanical subsystem
  • Concatenation
  • 3.4.2 Interconnected operation
  • 3.4.3 Isolated operation
  • 3.5 Analysis of the dynamic behaviour
  • 3.5.1 Decomposition of slow and fast dynamics
  • Fast dynamics
  • Slow dynamics
  • 3.5.2 Performance limitation for primary frequency control: capability criteria
  • Penstock water start time criterion
  • Surge tank cross-section criterion
  • References

Inspec keywords: power grids; power control; power generation control; hydroelectric power stations; reduced order systems; frequency control; power system simulation

Other keywords: power system; grid connected hydropower plants; generation control design; physical models; power-frequency controller design; practical engineering approach; reduced order models

Subjects: Hydroelectric power stations and plants; Frequency control; Control of electric power systems; Power and energy control; Power system control

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