Pitch system and method for test of a power bank and use of the pitch system for performing the method
AssigneeDeif A/S
InventorJesper Thomsen
Life of this patent
Estimating the term…
Abstract
Pitch system (1) comprising at least one pitch motor drive (3) connected an electrical network (5). Each pitch motor drive (3) is connected to a power bank, and the pitch system comprises a test module adapted to be activated in a test position. The test module comprises a brake module (8) each connected to a pitch motor drive (3), and each brake module (8) is adapted to load a pitch motor drive (3) with a certain load Rb. Hereby a voltage drop takes place over the power bank (6). The power bank (6) is separated into a number of power blocks (9) and the voltage drop ΔV of each power block (9) is adapted to be registered by the test module when the brake module (8) is activated.
Claims15
A pitch system for identifying a defective power block in a DC-power block having a plurality of power blocks utilized in a wind turbine or a marine energy installation having at least one pitch motor drive, each pitch motor drive is adapted to communicate with units comprising a motor which is connected to the pitch motor drive for positioning of a rotor blade, each pitch motor drive is connected to an electrical supply network, and each pitch motor drive is coupled to the DC-power bank, the pitch system comprising:
- a test module configured to be activated in a test position of the pitch system that disconnects the electrical supply network from the pitch motor drive, the test module comprises:
- a brake module connected to the at least one pitch motor drive, and the brake module is configured to load a pitch motor drive with a load/resistance RB by which a voltage drop ΔV is provided in each of the power blocks,
- the test module is configured to register the voltage drop ΔV for each of the power blocks starting at activation of the brake module and loading of the pitch motor drive with the load/resistance Rb until just prior to removal of the load/resistance Rb;
- the test module is configured to convert a registered voltage drop ΔV to a resistance value Rix for each power block having the number x,
- the test module is configured to convert a registered voltage drop ΔV to a capacitance value Cix for each power block having the number x,
- the test module is configured to compare the resistance value Rix and the capacitance value Cix for each power block having the number x with corresponding values for each of the power blocks,
- the test module is configured to report an error for the defective power block having the number x for Cix and Rix values of the block that deviate from predefined intervals (Ci′;
- Ci″) and (Ri′;
- Ri″), wherein end-values of the intervals comprise a capacitance value Ci and a resistance value Ri for the entire DC-power bank, and
- the test module is configured to report an error for the defective power block having Rix and the Cix values that are different from a predefined deviate value ΔAi between each of the power blocks.
A method for identifying and replacing a defective power block in a DC-power block having a plurality of power blocks connected to a pitch system for a wind turbine or a marine energy installation, said pitch system comprises at least one pitch motor drive adapted to communicate with connected units including a motor, connected to the pitch motor drive for positioning a rotor blade, said pitch motor drive(s) is/are connected to a supply network and each pitch motor drive is connected to the power bank, the method comprising:
- providing a test module comprising a brake module connected to the at least one pitch motor drive;
- activating by the test module a test position that disconnects the supply network to the pitch motor drive(s);
- loading by the test module a load/resistance Rb to each pitch motor drive;
- registering by the test module a voltage drop ΔV for each of the power blocks from activation of the brake module and loading of the pitch motor drive with the load/resistance Rb until just prior to removal of the load/resistance Rb;
- converting by the test module the registered voltage drop ΔV to a resistance value Rix for each power block having the number x;
- converting by the test module the registered voltage drop ΔV to a capacitance value Cix for each power block having the number x;
- comparing by the test module the resistance value Rix and the capacitance value Cix for each power block having the number x with corresponding values for each of the power blocks;
- reporting by the test module an error for the defective power block having the number x for Cix and Rix values of the block that deviate from predefined intervals (Ci′;
- Cr) and (Ri′;
- Ri″), wherein end-values of the intervals comprise a capacitance value Ci and a resistance value Ri for the entire DC-power bank;
- reporting by the test module an error for the defective power block having Rix and the Cix values that are different from a predefined deviate value ΔAi between each of the power blocks;
- and
- replacing the defective power block with a non-defective power block.
Dependencies are inferred from the claim text.