ABB GRID BREAKER UNIT GBU72 3BHE055094R0002 / 3BHE031197R0001 / 3BHB030310R0001

Quality certificates and applicable standards

The following certificates and conformity declarations are available with ABB:

– ISO 9001 / ISO 14001 certificates stating that ABB has implemented and maintains a management system which fulfills the requirements of the normative standards

– CE declaration of conformity

– EMC Test Certificate PCS6000 Montena_16602

– List of standards that the converter complies with (see “A01: Applicable standards & conformity”)

Tools

 ABB offers various tool sets containing all necessary tools and equipment for installation, 

commissioning and maintenance of the converter. The content of the tool sets is described 

in the “PCS6000 Service Manual”, 3BHS600000 E80

Product description

The following sections provide information on the individual units of the PCS6000 product platform.

Field of application

The PCS6000 is a medium voltage frequency converter that has been designed for large wind turbines and tidal applications. The PCS6000 belongs to a new generation of “Full Size Power Converters”.

Converter configuration

The PCS6000 is a modular type of frequency converter that is ideal for highly demanding medium voltage applications. The design allows maximum flexibility at different power ratings and also customized solutions involving a minimum prototyping and engineering effort. Two main concepts are available:– 1CL configuration: Single conversion line– 2CL configuration: Dual conversion line that allows you to operate the system in “constricted mode”, ie, with only one conversion line, if a component fails. This mode increases the availability of the wind turbine.

The PCS6000 fits in confined spaces and its modular design enables back-to-back, face-to face, and in-line configurations.

 POU Power unit (POU)

A POU contains three 3-level NPC phase legs with IGCTs. The semiconductors are clamped into one stack. A POU is controlled and supervised by the main circuit interface board that contains the control switching machine and the measurement interface.

DC-link unit (DLU)

The DC link unit (DLU) contains the following sub assemblies:

– Neutral point connection module

– Pre-charging module

– Voltage limiting module

– dv/dt filter

– DC link grounding isolator

– Generator disconnector module

Neutralpoint connection module (NCM)

PCS6000 converter's neutral point NP is connected to earth through an RC combination to limit the dv/dt of the converter against earth. This allows the converter to operate with a single earth fault for limited period of time. Normally, an earth fault is detected and the converter switched off immediately. A second function of the NCM is to discharge the DC-Link via high resistance in the case that the VLM does not work properly.

Voltage limiting module (VLM)

The VLM has an IGCT stack. If the DC-Link voltage exceeds a certain limit, the VLM closes the current path through the braking resistor to dissipate excessive energy. Another function is discharging DC-Link during shut down of converter.

dv/dt filter module (VFM)

The VFM reduces the dv/dt on the transformer or generator winding created by switching of the IGCTs and to attenuate high frequency oscillations between the IGCT power stack and the transformer.

DC-link grounding isolator

The main function of the DC-Link grounding isolator is to ground and short-circuit the converter DC-Link in case of service or maintenance work. The DC-Link grounding isolator is blocked in open position at DC-Link voltages higher than 50 V. The handle can be locked with a padlock in closed position to prevent unauthorized operation. The 2CL converter has two DC-Link grounding isolators, one per conversion line. The DC-Link ground isolator is a two position switch.– Open position:  DC-Link is not grounded – Closed position:  DC-Link is shorted and grounded

Generator disconnector module (GDM)

Typically the GDM is installed in a DLU. The GDM has a motorized 3-phase disconnector.– Closed position:  generator is connected to the converter – Open position:  generator is disconnected – Ground position:  generator is grounded In case that the motor mechanism fails (eg, due to lost auxiliary power for the GDM), an extension spin rod can be used to operate the GDM manually. This rod is stored inside the unit.

Grid breaker unit (GBU)

The GBU is a circuit breaker on the grid side of the converter. It performs not only the usual functions of making, breaking and short circuit breaking, but also contains a three position-switch for disconnecting and grounding the grid-side cables. The circuit breaker and the three position switch are located on a common mounting plate. The three-position-switch prepares - under zero current - for the connection to earth. Grounding is established by closing the circuit breaker with the three-position-switch set to ground position. The GBM is placed in a GBU. The switch can only be operated manually by a set of hand cranks.

ABB GRID BREAKER UNIT GBU72 3BHE055094R0002 / 3BHE031197R0001 / 3BHB030310R0001

Water cooling unit (WCU)

The main tasks of the WCU are:– Ensuring constant water pressure, flow and temperature– Interfacing to the external heat exchanger equipment– De-aeration of cooling water circuit– De-ionizing the cooling water A soft starter for the cooling pumps is available as option. The WCU can be specified for connection of the external heat exchanger on the top (standard) or bottom. The WCU varies depending on the converter size.