PRONEGA frequency control systems

PRONEGA frequency control systems


- A complete solution in a block container;
- On the basis of high-voltage frequency converters "L-Start";
- Work with electric motors of different types;
- Frequency control from one to eight (or more) electric motors;
- Work with various mechanisms;
- A wide range of applications.

- saving energy by reducing the rotational speed of the mechanisms, with the principle of operation in the zone of the highest possible efficiency implemented in PRONGA;
- to solve the problem of automatically maintaining the necessary operating modes of the equipment;
- protection of equipment against mechanical and hydraulic shocks arising in the process of direct starts and switching;
- equipment life extension;
- elimination of restrictions on the number of starts;
- reduction of dedicated power supply. In some cases, reducing the value of the maximum energy consumption of the installation, ensuring a more efficient and uniform mode of its operation.
Preparing for launch.
At the stage of preparation for the start-up of electric motors, the operating personnel selects a drive mechanism or a group of mechanisms with electric motors, if necessary, inspects their technical condition. The process of assembling a high-voltage circuit is carried out by moving the vacuum switches and manual disconnectors to the specified position. The assembly of the high-voltage circuit can be carried out in the following ways:
- through manual disconnectors of SESAC cells;
- from push-button posts of local control of electric motors, by turning the key for selecting the type of work “NETWORK/HVFC”;
- with ORC made on the basis of a panel computer, with a mimic diagram based on SCADA by selecting the appropriate electric motor and method of its operation ("NETWORK/HVFC");
- with the operator's workstation, similar to the ORC with a panel computer;
- with the automated process control system via the commands coming to PRONEGA or directly to the equipment.
When assembling a high-voltage circuit, operational and electromagnetic blocking of SESAC cells is taken into account. Upon completion of the high-voltage circuit assembly process, information on readiness for start-up comes to the operator or to the APCS.

Starting the motor.
Start of the electric motor of the selected mechanism can be carried out:
- from the local control button post by pressing the “Start” button, while if the start was carried out from the HVFC, the engine will reach the minimum speed value, in accordance with the internal settings of the HVFC;
- from the ORC on the basis of a panel computer, via a mimic diagram by selecting the start function of the selected electric motor;
- with the operator's workstation, similar to the ORC with a panel computer;
- from the APCS via the command coming to PRONEGA.
Depending on the method of starting the electric motor, PRONEGA deploys the drive mechanisms according to the following algorithm:
- a soft start of the electric motor with a drive mechanism is carried out by means of HVFC, while the acceleration time of the electric motor depends both on the settings of the motor start parameters and on the rate of the acceleration task from ORC, AWS, APCS;
- direct start of the electric motor with a drive mechanism is carried out by the bypass circuit bypassing the HVFC and is characterized by the occurrence of large dynamic forces in the drive mechanism, overheating of the stator windings, large starting currents and a fairly fast output to the nominal mode of operation. Direct start-up for PRONEGA, as a rule, is not the main one and is used in exceptional cases, such as bringing HVFC to repair, serious malfunction in the control system, etc.
The process of start-up and its completion is indicated on the button post of local control, on ORC, AWS. During the work from industrial control system, information on completion of start-up arrives on communication channels with "PRONEGA".

Adjustments.
PRONEGA can manage the performance of actuators by:
- direct on/off of electric motors (with cascade start/stop);
- frequency control;
- mixed control (frequency control of one electric motor and cascade start/stop of other electric motors).
Direct activation/deactivation of electric motors can be carried out both by commands from the ORC, AWP, APCS entering the control system, and directly from the APCS, if the presence of a local control system is not provided. Connecting the drive motors to the network is carried out bypass circuit to bypass HVFC. By turning on/off the vacuum switches or contactors of the SESAC cells or SWG.
Frequency control of the electric motor can be carried out both by commands and a reference signal from the ORC, AWS, APCS entering the control system and directly from the APCS, if the presence of a local control system is not provided. The connection of the driving motor to the HVFC is carried out by the switching equipment of the high-voltage part “PRONEGA”. Regulation of the rotational speed of the motor is carried out by the HVFC according to the law U/f = const or on the basis of the parameters of the task and the load on the motor shaft with vector control.
Mixed control of electric motors can be carried out both by commands and a reference signal from the ORC, AWS, APCS entering the control system and directly from the APCS, if the presence of a local control system is not provided. With mixed control, one electric motor works on HVFC, which allows changing the performance of the working mechanism smoothly, in the frequency range allotted for operation, and the remaining electric motors operate from the network according to the bypass circuit, which allows stepwise regulation of the performance of the whole complex.

Stopping the electric motors.
Stop of the electric motor of the selected mechanism can be carried out:
- from the button control of local control by pressing the “Stop” button;
- from the ORC on the basis of a panel computer, via a mimic diagram by selecting the stop function of the selected electric motor;
- with the operator's workstation, similar to the ORC with a panel computer;
- from the APCS via the command coming to PRONEGA.
The stop of the electric motor with a drive mechanism is indicated on the push-button post of local control, on the ORC, AWS. During the work from industrial control system, information on stop comes through communication channels with "PRONEGA".
Emergency shutdown of the drive mechanism is possible by the operational staff from the local control button posts at any stage of its operation, from the front panel of the HVFC motor in frequency control.

Work with synchronous motors.
“PRONEGA” can work with synchronous motors both by means of HVFCS and bypass scheme directly from the network.
When the synchronous electric motor is operated from the mains, PRONEGA performs a direct start of the synchronous electric motor in asynchronous mode, with the subsequent switching on of the excitation.
In the case of frequency regulation, the synchronous motor is started and the frequency regulation is carried out with the excitation winding turned on.
PRONEGA can carry out energy-efficient control of a synchronous electric motor using an algorithm to maintain a cosφ value close to one.

Synchronous transition to the network.
High-voltage frequency-controlled electric drive "PRONEGA" can perform synchronous transitions of the drive motor to the network and back to the network for power from the HVFC. To do this, the HVFC set includes an additional reactor cabinet, which is designed to limit the amount of HVFC currents in transients when switching a drive motor between the HVFC and the network.
Synchronous transfer to the network in “PRONEGA” is carried out by working out the HVFC switching command from the ORC, AWS or APCS to the network. HVFC, if necessary, leads the frequency of the output voltage to the frequency of the network, synchronizes the output voltage with the network voltage with the necessary accuracy in phase and amplitude.
The HVFC issues a command to the local control system about readiness for a synchronous transition.
Local control system monitors readiness for synchronous transition.
In normal operation mode, the local control system issues a command for switching to the by-pass switchgear or SESAC cell or transmits this command to the upper level control system.

In general, "PRONEGA" consists of:
1. High-voltage frequency converter of the HVFC series (one or more) for controlling an asynchronous or synchronous electric motor, including:
- a transformer cabinet with a dry multiwinding transformer in accordance with the requirements of GOST 11677-85 and a ventilation system;
- power cabinet with 15th, 18th, 27th power units, ventilation system and HVFC control system.
2. SESAC cells (with the exception of the simplified scheme with the inclusion of the engine in the gap) with vacuum switches, contactors and/or manual disconnectors.
3. Control systems (CS) made on the basis of the controller SIMATIC S7-1200 or OVEN PTK (optional). CS may not be part of “PRONEGA” provided that the external automated control system (automatic control system) exercises separate control of the components of “PRONEGA”.
4. Operator's remote control panel (ORC) with SCADA technological mimic diagram or automated workstation (AWS) (optional).
5. Push-button posts of local management (are delivered optionally upon the demand of the customer).
6. Electric board of own needs (EBON) (optional).
7. Uninterruptible power supply (UPS).
8. Auxiliary voltage regulator 0.4 kV (optional).
9. Fire alarm systems (optional).
10. Set of control and power cables.
11. Heating and ventilation systems (HVS), which includes:
- ventilation control panel (VCP);
- heaters of type Tropic, TEN;
- ventilation chamber with equipment.
12. Lighting systems (optional).
13. Mobile or prefabricated building (optional).
List of single-line diagrams

PRONEGA has a number of high-voltage part versions that allow to solve the main range of tasks for the implementation of a soft start and frequency control of electric motors. Description of the high-voltage part of the "PRONEGA" are given in table 3. If the task cannot be solved using the proposed solutions, then the high-voltage part of PRONEGA can be implemented on the basis of basic solutions or technical requirements of the customer indicated in the questionnaire for a high-voltage frequency-controlled drive. Technical solutions that differ from the basic ones are developed according to the initial requirements of the customer.

1.0. The scheme of the electric motor frequency control system "PRONEGA" is implemented on the basis of HVFC connected to the gap of the power supply of the SWG cell and the drive motor. Taking the HVFC out of service for repair is carried out together with the drive engine.

1.0

1.1. The scheme of the electric motor frequency control system "PRONEGA" is implemented on the basis of HVFC with the bypass of connected to the gap of the power supply of the SWG cell and the drive motor. HVFC with bypass allows you to enter into work and remove from work HVFC and at the same time start and operating the drive motor. Taking the HVFC out of service for repair is carried out together with the drive engine.

1.1

2.0. The scheme of the electric motor frequency control system "PRONEGA" is implemented on the basis of HVFC and SESAC cells with vacuum switches. HVFC is connected to the open circuit of the power supply circuit of the driving motor and the feeding cell, while the SESAC cells make it possible to commission and release the HVFC from work or repair and at the same time start and operate the drive motor. The high-voltage circuit is assembled by means of vacuum switches.

2.0

2.1. The scheme of the electric motor frequency control system "PRONEGA" is implemented on the basis of HVFC and SESAC cells with manual disconnectors. HVFC is connected to the open circuit of the power supply circuit of the driving motor and the feeding cell, while the SESAC cells make it possible to commission and release the HVFC from work or repair and at the same time start and operate the drive motor. The high-voltage circuit is assembled by means of manual disconnectors. The scheme is applicable for electric motors with power up to 2000 kW inclusive.

2.1

2.2. The scheme of the electric motor frequency control system "PRONEGA" is implemented on the basis of HVFC and SESAC cells with manual disconnectors. HVFC is connected to the open circuit of the power supply circuit of the driving motor and the feeding cell, while the SESAC cells make it possible to commission and release the HVFC from work or repair and at the same time start and operate the drive motor. The high-voltage circuit is assembled by means of manual disconnectors. The scheme is applicable for electric motors with a capacity of more than 2000 kW.




2.2

3.0 The scheme of the electric motor frequency control system "PRONEGA" is implemented on the basis of HVFC and SESAC cells with vacuum switches, the number of which depends on the number of drive motors. The scheme allows you to perform start-up and frequency control of drive motors from HVFC, start-up of drive motors from the SWG supply cells through the bypass. For HVFC operation, it is necessary to have a free cell in the supply sections of the SWG (or several cells in different sections of the SWG). The presence of SESAC cells allows you to enter into work and remove from work or repair HVFC, even if the SWG supply cell powering the HVFC is not switched to the repair position, perform a selection of electric motors to be started and frequency controlled. HVFC is connected to the existing power supply system and does not require replacement of the existing power cables laid from the power supply cells of the switchgear to the drive motors. This scheme is intended for the use of HVFC with power of up to 2000 kW inclusive.

3.0

3.1 The scheme of the electric motor frequency control system "PRONEGA" is implemented on the basis of HVFC and SESAC cells with vacuum switches, the number of which depends on the number of drive motors. The scheme allows you to perform start-up and frequency control of drive motors from HVFC, start-up of drive motors from the SWG supply cells through the bypass. For HVFC operation, it is necessary to have a free cell in the supply sections of the SWG (or several cells in different sections of the SWG). The presence of SESAC cells allows you to enter into work and remove from work or repair HVFC, perform a selection of electric motors to be started and frequency controlled. HVFC is connected to the existing power supply system and does not require replacement of the existing power cables laid from the power supply cells of the switchgear to the drive motors. This scheme is intended for the use of HVFC with power of more than 2000 kW.

3.1

3.2 The scheme of the electric motor frequency control system "PRONEGA" is implemented on the basis of HVFC and SESAC cells with vacuum switches, the number of which depends on the number of drive motors. The scheme allows you to perform start-up and frequency control of drive motors from HVFC, start-up of drive motors through the bypass. The presence of SESAC cells allows you to enter into work and remove from work or repair HVFC. To power the HVFC, a power cell of one of the motors is used, to which a section is added consisting of two SESAC cells with vacuum switches. One of the SESAC cells powers the motor bypass, the other - HVFC. The remaining engines operate on the network according to the existing scheme and do not require replacement of the existing power cables laid from the power supply cells of the switchgear to the drive motors.

Однолинейная схема силовой части «ПРОНЕГА»

3.3 The scheme of the electric motor frequency control system "PRONEGA" is implemented on the basis of HVFC and SESAC cells with vacuum switches, the number of which depends on the number of drive motors. The scheme allows you to perform start-up and frequency control of drive motors from HVFC, start-up of drive motors through the bypass. The presence of SESAC cells allows you to enter into work and remove from work or repair HVFC. To power the HVFC from two sections, power cells of two engines are used in different sections, to which 2 sections of SESAC are added. Each section of SESAC consists of two SESAC cells with vacuum switches. One of them provides power to the motor, the second - to HVFC. The remaining engines operate on the network according to the existing scheme and do not require replacement of the existing power cables laid from the power supply cells of the switchgear to the drive motors.

Однолинейная схема силовой части «ПРОНЕГА»

4.0 The scheme of the electric motor frequency control system "PRONEGA" is implemented on the basis of HVFC and SESAC cells with vacuum switches, the number of which depends on the number of drive motors. The scheme allows you to start and frequency control of the drive motors from HVFC, direct start on the bypass from the corresponding SESAC. For HVFC operation, the presence of free cells in each of the supply sections of the switchgear is not required. It is not required to control the power supply cells of the SWG for switching to the bypass motor power supply circuit from the network. The presence of SESAC cells allows you to enter into work and remove from work or repair HVFC (when taking HVFC out for repair, you must release the power supply SWG cell in the repair position), perform a selection of electric motors to be started and frequency controlled. The scheme does not require modification of existing SWG cells in terms of control circuits, electromagnetic and operational locks. The scheme allows the start of the selected motor from different supply sections of the SWG.

4.0

 
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