Browse Prior Art Database

A WIND POWER PLANT CONTROLLER WITH SENSOR LOGIC FOR DETECTING GRID SENSOR FAILURES

IP.com Disclosure Number: IPCOM000234918D
Publication Date: 2014-Feb-14
Document File: 6 page(s) / 34K

Publishing Venue

The IP.com Prior Art Database

Abstract

A method for detecting failures in grid sensors is presented. The method applies particularly to grid sensors which supplies measured grid values to a power plant controller configured to control renewable power generation installations - e.g. wind turbine generators, hydro power generators or solar power generators - on basis of the measured grid values. An algorithm is presented that monitors the output from the grid sensors and determines if a sensor or/and sensor link to the controller fault is present. The fault may be due to a fault in the sensor or a fault in a communication link between the sensor and a controller, i.e. a fault that affects communication of sensor measurements from the sensor. In case of this fault, one or more actions may be invoked in order to handle the fault in a proper way.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 26% of the total text.

Page 01 of 6

1

A WIND POWER PLANT CONTROLLER WITH SENSOR LOGIC FOR DETECTING GRID SENSOR FAILURES

ABSTRACT
A method for detecting failures in grid sensors is presented. The method applies

5

particularly to grid sensors which supplies measured grid values to a power plant controller configured to control renewable power generation installations - e.g. wind turbine generators, hydro power generators or solar power generators - on basis of the measured grid values. An algorithm is presented that monitors the output from the grid sensors and determines if a sensor or/and sensor link to the

10

controller fault is present. The fault may be due to a fault in the sensor or a fault in a communication link between the sensor and a controller, i.e. a fault that affects communication of sensor measurements from the sensor. In case of this fault, one or more actions may be invoked in order to handle the fault in a proper way.

15

DETAILED DESCRIPTION
Fig. 1 illustrates a wind power plant (WPP) comprising a power plant controller (PPC) and one or more wind turbine generators (WTGs). One function for the PPC is to generate setpoints to the WTGs, e.g. setpoints for active and/or reactive

20

power to be produced by the WTGs. The setpoints may be determined dependent on the grid values measured by the grid sensors and reference values (REF). The grid sensors may be located at a point of measurement (POM) near the grid.

The electrical reference values contain reference values of electrical parameters 25 which are desired to inject into the grid, e.g. references of voltage, active power, reactive power and/or frequency that should be present at the POM. Either a grid operator, a dispatcher centre or a WPP operator may provide the electrical reference values.

30 Since the setpoints may be determined dependent on the grid values, it is important that the values provided by the grid sensors represent the actual electrical values at the point of measurement (POM).


Page 02 of 6

2

The power connections between the grid and the WTGs may be a three-phase power connection. Nevertheless, the method also applies to systems with other number of phases.

The grid sensors sensor may be in the form of voltage and current sensors/transformers (VT and CT) which supplies the measured values of voltage and current to the PPC, possibly via a power meter (PM). For example, one voltage transformer and one current transformer may be connected to each phase of the power connection.

The grid meter may process the measured values into values suitable for the PPC. For example, the PM may determine values of voltage, active and reactive power and frequency on basis of measured voltage and current signals supplied by the grid sensors.

15
The PPC supplies the setpoints to the WTGs via a connection as illustrated in Fig.


1.

In the WPP one or more electrical transformers may be located between the power output of the WTGs and the grid for the purpose of adapting the voltage of the WTG's power outpu...