Excitation System

The excitation system is divided into three main types based on the source of magnetic field flux production:

1. Direct current stimulation systems
In this type of excitation system, direct current generators are used as a source of flow generation, which provide stimulation through brushes. The stimulus may be rotated either by an independent motor or by the generator axis or by self-stimulating or stimulating. In an independent stimulation state, the stimulation current of the excitation system is provided through an auxiliary stimulation system that has a permanent magnetic field. Of course, these kind of systems are old and nowadays static and alternating current systems are used. Some of these systems utilize amplifier voltage regulators.

2. Alternating current propulsion systems
In this type of excitation system, alternating current generators are used to create the required stimulation current in the main generator rotor coil. In this case, the oxidizer (stimulator) is usually located on the same main axis of the turbogenerator. Then the output of the diverging flow of the oxidizers is recirculated and the direct current generated is transmitted to the main generator's actuator coil. The rectifier system can either be stationary or rotary.

2.1. Systems with resident rectifier
If the rectifier system is stationary, the output of their direct current must be transmitted through brushes to the main generator's actuator coil. In the case of uncontrolled diode rectifiers, the alternating current controls the excitation excitation regulator, which, in turn, is responsible for controlling the output voltage of the oxide.

2.2. Systems with rotating rectifier
In these types of systems, due to the turning of the rectifiers, the use of brushes or charcoal is removed and the output of the direct current of the oxide directly to the generator is applied. The design of these kind of systems is known as the brushless excitation system.
Primary alternating current propulsion systems used a combination of magnetic and rotary amplifier systems as regulators, but most other systems use electronic amplifiers.

3. Static flow stimulation systems
In this method, the generator excitation current is supplied from an external source, usually an independent source of battery. For proper use and prolong battery life, after the generator is launched, the source is extracted from the circuit and the generator's own power Using electronic devices, it replaces power.

The purpose of this excitation system is to create an intelligent system with standard components in a form that offers superb reliability and perfect performance.

The actuator control control system is designed to be installed on steam generators and gas generators. The AVR control and control system, regardless of the type of stimulation, can be installed on a variety of static and dynamic propulsion systems. Due to the needs of the employer, it is also possible to customize this system for different units.

After nearly two decades of experience in the manufacture of various electronic cards, the Ahar Power Company has been able to acquire specialized knowledge and experience by producing various excitation and designing systems, such as making Tabriz, Kish, Petrochemicals, Bandar Abbas and others. In this field, for the first time in the country, it will know the design and construction of generator control and protection systems for steam and gas power plants. Designing and implementing all of the power and control systems of the system and its implementation as a DCS system are part of the company's technical capabilities in this regard. The hardware and topology of these systems are largely based on the Siemens DCS technology in Germany.

The most important features of this system include:

    Configuration of the Siemens hardware and control unit based on PLCs of class 300 and 400
    Using Siemens PCS7 software and CFC programming
    The processing speed of the control loops is less than 2 ms
    Possibility to implement the system through hot redundancy in control, power and cooling systems
    Reducing generator losses by placing its operating point at the work point and hence increasing the generator efficiency
    Possibility to communicate with the proxy bus network and industrial Ethernet network
    Possibility to change the power of the excitation system from the dynamic to static mode and the removal of the middle and middle power generators
    Full control over the generator by various control modes
    Voltage controller in automatic mode (automatic voltage regulator) AVR
    FCR (Field Current Regulator) Flow Control
    Reactive power control and generator power factor in PF (power factor), VAR
    Transition without muting between control modes
    Reactive flow heater and the ability to determine the line drupe or reactive power drill
    The soft start function of the generator's voltage to prevent sudden spurts when triggered
    UEL (under excitation limiter), OEL (over excitation limiter) limiting stator current limiter (STOR current limiter) and limiting volts per Hz (V / Hz)
    Show the generator's work point in the generator's power generation curve on the HMI
    Design of the power sector as a two-part system for increasing the speed of the De-excitation
    Monitoring the position of the rotating diodes in the dynamic stimulation system and the state of the thyristors in the static excitation system
    And....

The following table describes the features, features and hardware features of the Ahar Corporation excitation system:

And in the following table, the characteristics, features and software features of this excitation system are expressed:

Advantages of the designed system:

    Use the simple interface and touch LCD display for easy operation
    Ability to create a specific list of arbitrary parameters in the system for error detection and maintenance
    Ability to define different access levels for operator, user and repairer
    Modular design for quick repair and replacement of parts
    Use the datagram to record important events in the system

Advantages of using a shaving stimulus system:

    Enhance the flexibility of the system to achieve a specific work point
    Reduce repair time
    Enhance process reliability
    Increase system access
    Protective system for monitoring the system and responding to an error
    Uninterrupted recording of system events

The modular design of this system has made it possible to accommodate different needs of this system and, for any conditions and requirements, it is possible to install and implement a steam agitation system. This system has the ability to adapt and function alongside the old systems, which makes it possible to replace the system with parts of the old system to meet the demands of modernization and upgrading the old systems. In addition, it is possible to upgrade this excitation system at any time, without any major changes in the structure, will be updated by installing new system modules, which will also increase the flexibility of the system.

Significant performance indicators in Sanyar's system make it a system that is effective:

Short delivery time: In general, the installation and testing process of this equipment is possible over a short period of time and is ready for delivery in a short time.

Flexible settings: The high-level configuration of the system allows the preparation to be implemented in a completely customized format for each unit and adapted to the day's parameters of that unit.

Simple operation: The existence of an HMI in the system body provides easy access to stored events, accessible settings, and monitoring of the system and its components.

Optimal Dimensions: The small size of the cabin system makes it possible for the panel to be placed in small environments.

Tracking Changes: Any activity performed by the user of the system or changes made in the parameter settings will be stored in the form of recording the history of events in the system memory.

Due to the use of parallel structure (redundant) in the design of Ahar's agitation system, the reliability of this system increases significantly and in the event of a random error in active units, with an uninterrupted replacement of the part, the overall performance of the unit will not stop. Became

The parallel structure is observed in the following sections and the following modules can be easily and in the shortest possible time:

    Full throttling in the controller and processors section
    Full throttle in the power converters section
    Perfect thinning in a fiber-optic network between processors
    Perfect thinning in PROFINET network and PROFIBUS network
    Full level readout at the level of I / O modules
    Full scalding in the nutrition section
    Full throttling in transducer modules
    Reading in the reading of generator voltage feedback
    Rejection in power supply converters

Using this system will reduce the cost of operation and repairs and because of the services of a domestic company, will provide reliable and long-term after-sales service.

The executive generator team consists of eight senior engineers with advanced education in electrical engineering, electrical engineering control, electrical engineering, mechanical engineering and computer engineering, as well as a background in the field of generator control and how it works. Their performance has led to the creation of an excitation system for Alstom and Steam units, and has been stepping up the process of localization of this knowledge.
This unit is managed directly by the company's manager.
The organizational chart of this unit is as follows:

1. Design, construction and installation of Kish Power Plant's F5 Turbine Excitation System Cards

2. Design, construction and installation of Tabriz Power Plant's fiat Turbine Excitation System Cards

3. Design, construction and installation of Excitation series of cards for the Westinghouse unit of Shahid Hasheminejad gas refinery (Khangiryan)

4. Design, construction and installation of Afghanistan (Harat) Power Plant Turbine Excitation System Cards

5. Design, construction and installation of Fuji synchronous motor Excitation system cards of Bandar Abbas refinery

7.Design, construction and installation of the Alstom Generator's Excitation System at Shams Sarakhs Power Plant

8. Design and construction of the GE steam unit generator for Besat Power Plant

1.Design, construction and installation of the Skoda Generator's Excitation System at Mashhad Power Plant

Sarakhs Power Plant
Besat Power Plant
Kish Power Plant
Tabriz Power Plant
Afghanistan Herat Power Plant

Shahid Hasheminejad Refinery
Bandar Abbas refinery