ABB UAD149A0001 3BHE014135R0001 excitation controller

Core functions and control advantages

1. Precise voltage regulation to ensure system stability

The excitation controller has high-precision voltage regulation function, with a voltage regulation accuracy of ± 0.2% of the rated voltage. It can quickly respond and adjust the excitation current under complex working conditions such as generator load fluctuations and grid voltage disturbances, and stabilize the generator terminal voltage within the set range. Its built-in adaptive adjustment algorithm can dynamically optimize control parameters based on changes in operating conditions, effectively suppressing voltage fluctuations and avoiding equipment damage or power interruption caused by abnormal voltage.

2. Reactive power optimization allocation

Supporting dual modes of automatic allocation and manual adjustment of reactive power, it can achieve balanced distribution of reactive power when multiple generators are running in parallel according to the operation needs of the power grid, reduce reactive power circulation, and improve the power factor of the entire power supply system. At the same time, the controller has a reactive power limitation function, which can prevent operational risks caused by over excitation or under excitation of the generator and extend the service life of the equipment.

3. Improve protection mechanisms to enhance operational security

Built in multiple fault protection functions, including overexcitation protection, underexcitation protection, overvoltage protection, overcurrent protection, excitation circuit fault protection, etc. When the system experiences abnormal operating conditions, the controller can quickly detect and trigger protective actions within milliseconds. By cutting off the excitation circuit, issuing alarm signals, and other methods, the fault can be avoided from expanding, ensuring the safety of the generator and related equipment. In addition, the device also has fault memory and query functions, making it easy for maintenance personnel to quickly locate problems.

4. Flexible operating mode and communication capability

Supporting multiple operating modes such as isolated network operation and grid connected operation, it can meet the usage needs in different scenarios. Capable of independently maintaining system voltage stability during isolated network operation; During grid connected operation, it can work in conjunction with the power grid dispatch system to achieve precise control of reactive power. In terms of communication, the controller is equipped with multiple communication interfaces such as RS485 and Ethernet, supporting mainstream communication protocols such as Modbus and IEC61850. It can seamlessly integrate with power plant monitoring information systems (SIS) and distributed control systems (DCS) to achieve remote monitoring, parameter setting, and data uploading.

Key technical parameters

input power

DC 220V/110V, allowable fluctuation range ± 15%

Adapt to commonly used DC power supply systems in power plants

Voltage regulation range

80% -110% of rated voltage

Meet the voltage control requirements under different operating conditions

Current regulation range

0-120% rated excitation current

Covering the normal operation and strong excitation conditions of the generator

response time

≤10ms

Quickly respond to power grid and load fluctuations

Working environment temperature

-10℃-55℃

Adapt to the environment of power plant control room and equipment room

relative humidity

≤ 90%, no condensation

Avoid equipment failures caused by humid environments

Protection level

IP20 (panel)

Suitable for indoor control cabinet installation

Structural design and installation characteristics

The excitation controller adopts a modular structure design, integrating the control unit, signal acquisition unit, power drive unit, communication unit, etc. into a standard rack mounted chassis, with a compact structure that is easy to install and maintain. The chassis is made of high-strength metal material and has good electromagnetic shielding performance, which can effectively resist on-site electromagnetic interference and ensure the stable operation of equipment in complex electromagnetic environments.

The installation method supports standard 19 inch cabinet installation, with moderate installation depth, suitable for the layout of control cabinets in most power plants. The front end of the device is equipped with a high-definition LCD display screen and operation buttons. Operation and maintenance personnel can intuitively view real-time operating parameters such as generator voltage, current, and power through the display screen. They can quickly complete parameter settings, mode switching, and other operations through buttons, making the operation convenient and intuitive.

Application scenarios and typical cases

Due to its outstanding performance, ABB UAD149A0001 3BHE014135R0001 excitation controller is widely used in various synchronous generator systems, including:

-Thermal power plants: equipped with steam turbine generators to achieve stable excitation control and improve unit operating efficiency;

-Hydroelectric power plant: Adapt to the load fluctuation characteristics of hydro generators, accurately adjust reactive power, and ensure the stability of the power grid;

-Industrial self owned power plants: such as the self owned generator systems of metallurgical and chemical enterprises, providing reliable power guarantee for production;

-New energy supporting facilities: such as biomass power generation, waste incineration power generation and other new energy projects, to enhance the grid adaptability of the power generation system.

A typical case includes the transformation of the excitation system of a 30MW steam turbine generator in a large steel enterprise's self owned power plant. After adopting this controller, the fluctuation amplitude of the generator terminal voltage decreased from ± 1.5% to ± 0.2%, and the reactive power regulation response speed increased by 40%, effectively reducing the risk of power failures in the production process and improving production continuity.

Key points of operation and maintenance

To ensure the long-term stable operation of ABB UAD149A0001 3BHE014135R0001 excitation controller, the following operation and maintenance points should be noted:

1. Regular cleaning: Clean the surface and ventilation openings of the equipment every quarter to avoid dust accumulation and affect heat dissipation;

2. Parameter inspection: Check the operating parameters of the controller monthly to ensure consistency with the system settings, with a focus on checking voltage regulation accuracy, protection settings, etc;

3. Communication testing: Test the communication function of the controller every six months to ensure normal data transmission with the monitoring system;

4. Power supply inspection: Regularly check the voltage stability of the input power supply to avoid equipment failure caused by power supply fluctuations;

5. Fault handling: When the equipment generates an alarm signal, the fault memory function should be used to promptly query the cause of the fault and carry out targeted repairs to avoid blind power outages or disassembly.