# US 10,480,488 B2 · Wind turbine with a speed regulator and a generator regulator

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- Number: US 10,480,488 B2
- Document ID: US10480488B2
- Status: Granted
- Kind: B2
- Application number: 15/294,262
- Filed: 2016-10-14
- Published: 2017-04-20
- Granted: 2019-11-19
- Earliest claimed: 2015-10-16
- Assignees: Nordex Energy GmbH
- Applicants: Nordex Energy GmbH
- Inventors: Detlef Drossel; Florian Bode
- Web page: https://patentgrep.com/patent/US10480488B2

## CPC

- F03D 7/042: {by means of an electrical or electronic controller}
- F03D 1/06: Rotors
- F03D 7/0224: {Adjusting blade pitch}
- F03D 7/0276: {controlling rotor speed, e.g. variable speed}
- F03D 7/043: {characterised by the type of control logic}
- F03D 9/25: the apparatus being an electrical generator (F03D9/22 takes precedence)
- F03D 7/045: {with model-based controls}
- F05B 2270/101: to control rotational speed (n)
- F05B 2270/309: Rate of change of parameters
- Y02E 10/72: Wind turbines with rotation axis in wind direction
- F03D: WIND MOTORS
- F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A wind turbine having a rotor, which has at least one rotor blade adjustable about its longitudinal axis via a pitch control, and a generator, driven by the rotor, having a speed regulator, which takes a control difference in the rotational speed and generates a control variable for the pitch control, and a generator regulator, which takes a power conductance and determines a rotational speed setpoint and a power setpoint, wherein a pilot control is provided that uses an inverse controlled system to determine a control variable for the pitch control, the inverse controlled system determining a power torque (MP) from the rotational speed setpoint and the power setpoint and also an acceleration torque (MB) from the change in the rotational speed setpoint over time and outputting the control variable for the pitch control as an output variable that provides pilot control for the output variable from the speed regulator.

## Claims

### Claim 1

A wind turbine comprising:
a rotor having at least one rotor blade defining a longitudinal axis;
a pitch control;
said at least one rotor blade being adjustable about said longitudinal axis via said pitch control;
a generator configured to be driven by said rotor;
a speed regulator configured to generate a control variable (dpitFF/dt) for controlling the pitch of said rotor blade from a control difference in rpm;
a ramp function (P_Ramp) and a further downstream rotational speed ramp configured to determine a rotational speed setpoint (nS) and a power setpoint (PS) from a power reference value (PL);
a feedforward controller for determining said control variable (dpitFF/dt) for said pitch control;
said feedforward controller being configured to determine a power torque (MP) from said rotational speed setpoint (nS) and said power setpoint (PS) and to determine an acceleration torque (MB) from a time dependent change of said rotational speed setpoint (nS); and,
said feedforward controller being further configured to output said control variable (dpitFF/dt) for said pitch control as an output variable which is added to a pitch speed (dpit_n/dt) and applied to an integrator (PitInt) configured to output an output signal, wherein said output signal of said integrator (PitInt) is a pitch angle to be set on the wind turbine.

### Claim 2 (depends on 1)

The wind turbine of claim 1 further comprising:
a drive train; and,
said feedforward controller being configured such that power drawn by said rotor is sufficient at least to provide said power setpoint (PS) and an acceleration of said drive train.

### Claim 3 (depends on 1)

The wind turbine of claim 1, wherein said control variable (dpitFF/dt) for said pitch control corresponds to an adjustment speed for a blade pitch angle.

### Claim 4 (depends on 3)

The wind turbine of claim 3, wherein said control variable (dpitFF/dt) for said pitch control corresponds to an adjustment angle for said blade pitch angle.

### Claim 5 (depends on 1)

The wind turbine of claim 1, wherein a time dependent change rate is determined for a sum of said power torque (MP) and said acceleration torque (MB) which is applied to an amplification to determine the control variable (dpitFF/dt) to be outputted for said pitch control.