SU1763288A1 - System for controlling ac propeller drive with single power station - Google Patents

Description

one

(21) 4803674/11

(22) 03/19/90

(46) 09/23/92. Bul No. 35

(71) Leningrad Higher Marine Engineering School im. adm. S. O. Makarova

(72) C. S. Ivanov and A. S. Bykov

(56) Khaikin A. B. Modern and prospective electrodes. L .: Shipbuilding, 1969, p. 322, 340.

(54) CONTROL SYSTEM FOR THE ELECTRICAL POWER ELECTRICAL INSTALLATION OF AC VOLTAGE WITH UNIFORM POWER PLANT

(57) Use: shipbuilding, control systems for rowing electrical installations, Summary of the invention: the control system of the rowing electrical installation contains synchronous generators (1) connected through switching devices (2) to distribution buses (3) to which the rowing motors (4) are connected through switching devices (5). Through the power unit (6), general ship electric consumers (7) are supplied with power. The control device (12) of the reactive current of the propeller motor includes the exciter (8) with the control system (9) and the regulator (10) of the reactive current with the sensor (11) of the reactive current. Switching devices (2) are connected to control inputs of electronic switches (13), the outputs of which through an adder (14) and matching amplifier (15) are connected to an adder (16). Switching devices (5) are connected to control inputs of electronic switches (17), the outputs of which are connected via adder (18) to an adder (16), the output of which is connected to the input of a division unit (19). 1 il.

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The invention relates to electric power systems and can be used in autonomous, in particular, ship electric power systems of alternating current.

Control systems of a synchronous electric motor in autonomous electric power systems are known (Dmitriev V.S. Modern three-phase shaft generator sets of stable frequency. TsBNTI.MMP. Obzorna informatsia, 1973, p. 38; Bruskin D. Е. and others. Electric machines. 4.2 -14 .: Higher school, 1979, pp. 113-114; A.S. of the USSR Class B 63 N 23/34 No. 637299, published in 1979; A.S. the USSR Class B 63 N 23/34 No. 1137015, published in 1985, Japanese Patent Class H 63 H 23/34 No. 14400, published in 1979), which contain a pathogen with a control system of a synchronous motor connected to a source of a master signal ala These control systems can improve the efficiency of an electrical power installation by increasing the cosp of synchronous generators (SG). and also allow for greater stabilization of the voltage on the tires of the power plant at varying loads of electrical consumers.

The disadvantages of these control systems include the fact that they do not minimize the electrical losses of the electrical installation as a whole.

The known control system of the rowing electrical installation of alternating current with a single power plant, described in the book. Khaykina A. B. Modern and prospective electric ships. - L .; Shipbuilding, 1969, p. 332, 340; in the book. Syubaev M. A. Works of rowing electrical installations during a ship’s rolling. - L .: Shipbuilding, 1977, p. 49-52 and selected by the authors as a prototype, containing synchronous generators connected to distribution buses, to which a synchronous rowing electric motor (DM) and general ship consumers (OEP), an SD excitation system, composed of an exciter with a control system, are connected. A change in the control signal of the control system, overexcites the LED, as a result of which it operates in the synchronous compensator mode, providing the required value of cos p SG and stabilizing the voltage

distribution tires at variable load SD and OEP.

To the disadvantages of such a control system of an AC electric rowing unit with a single power plant

should include an increased value of electrical losses in the entire electrical system.

These drawbacks are eliminated in the proposed device of the control system for an AC electric propulsion unit with a single power station.

The purpose of the invention is to increase the fuel consumption of the electric power plant and the reliability of electric machines by minimizing electrical losses. This will lead to an increase in the efficiency of the electric power installation, will reduce the heating of the insulation of the windings of electrical machines, i.e. will increase their service life; for this, the excitation of the LEDs must be such as to provide a reactive (capacitive component of the total current of the LEDs equal to the following value (with the same units):

1eprg

where is the item - the number of employees, respectively, SG and DM;

1oep Ј total reactive current operating OED;

year / ep-active resistance, respectively, DM and SP

The goal is achieved by combining an alternating current with a single power plant, containing synchronous generators connected through switching devices to distribution buses, to which synchronous rowing electric motors are connected through switching devices and, for example, a transformer, general ship consumers, excitation systems of synchronous rowing electric motors comprising an exciter with a control system, equipped with reactive current regulators each synchronous propeller motor with corresponding reactive current sensors, reactive current sensor of general ship electric consumers, connected by its output through the first matching amplifier to the first input of the dividing unit, the output of which is connected to the driving inputs of the reactive current regulators; the first adder, the inputs of which through electronic switches of the respective synchronous motors are connected to the sources of the reference voltage, and the output to one of the inputs of the second adder, the output of which is connected to the second input of the division unit, while the other input of the second adder through the second matching amplifier is connected to the output The third adder, the inputs of which through electronic keys of the corresponding synchronous generators are connected to the sources of the reference voltage.

The drawing shows a block diagram of an AC power plant with a single power plant with a control system.

It includes synchronous generators (G) 1, connected via the corresponding switching devices (SC) 2 to the distribution buses (RS) 3, to which the rowing synchronous motors (HED) are connected via the corresponding switching devices (SC) 5. From the distribution buses 3 through the unit power supply (AP) b (for example, an electric machine converter, a transformer) are fed general ship electric consumers (OE) 7. Synchronous motor 4 is equipped with an exciter (HP) 8 with a control system (SU) 9, the input of which is connected to the output of the regulator An open circuit of the reactive current of the synchronous motor (PT) 10, the second input of which is connected to the output of the reactive current sensor (CCD) 11 of the synchronous motor 4. The exciter 8 with the control system 9, the regulator of the reactive current 10 with the reactive current sensor 11 current of the synchronous propeller motor (URT) 12. Switching devices 2 generators 1 with their control outputs connected to the control inputs of the corresponding electronic switches 13, the power inputs of which are connected to the source m of the reference voltage, and the outputs through the first summation unit (BS) 14, the first matching amplifier (DC) 15 are connected to the first input of the second summation unit (BS) 16. The switching devices 5 of the rowing electric motors 4 are connected to the control inputs by their control outputs corresponding electronic switches 17, the power inputs of which are connected to the sources of the reference voltage, and the outputs through the third summation unit (BS) 18 are connected to the second input of the summation unit 16, the output of which is connected to the second input of the division unit (DB) 19, a reactive current sensor of general power consumers (DRT) 20 is connected to the input of the power supply unit, which by its output through the second matching amplifier (US) 21 is connected to the first input of the division unit 19.

Combs electrical installation with a single power plant and with the control system synchronized rowing

of electric motors works as follows. The structural scheme of the ship electric power plant (the number of operating generators 1 and rowing

electric motors 4 and ship-based electric consumers 7 is selected depending on the specific operational load mode of operation and is recruited by switching the corresponding

switching devices 2, 5, connecting to distribution buses 3 in the general case, p - generators and m - synchronous motors. The working GES circuit diagram is fixed by electronic

the keys 13, 17 whose output signals are summed in the corresponding blocks 14, 16,18. The matching amplifier 15 changes the output signal of the summing unit 14 depending on the ratio of the active resistances of the main windings of the motor and the generator.

The change in the total current of the general electrical consumers is detected by the reactive current sensor 20, the output signal

which is corrected by matching amplifier 21. The output signals of matching amplifier 21 and summation unit 16 are fed to division unit 19, the output of which produces a signal proportional to the desired reactive current of the propeller synchronous motor 4 and is fed to current regulator 10, where it is compared with the signal coming from sensor reactive current 11 synchronous motor,

proportional to the actual value of the reactive current. The signal from the output of the current regulator 10 controls, through the control system 9, the exciter of the motor 8, the excitation current of the synchronous motor 4,

those. change its reactive current value.

The control process will continue until the actual value of the reactive current of the synchronous motor

equalized with given division block 19.

Thus, optimal control of the minimum electric losses in the electric power installation of the synchronous motor excitation control is carried out. This reduces electrical losses by about 10% compared with a synchronous motor excitation control system providing cos

RSG 1. A decrease in electrical losses in addition to an increase in fuel consumption leads to an increase in the reliability of electric machines by lowering the heating temperature of the winding insulation, i.e. their service life increases

Claims (1)

Claims An AC power plant control system with a single power plant comprising synchronous generators connected via switchgear to distribution buses to which synchronous rowing motors are connected via switchgear units, through ship power consumers of a rowing motor exciter unit, different from that in order to increase the efficiency of the rowing electrical installation and the reliability of the electrical equipment yn due to minimize electrical leakage, the control system is provided with current sensors jet propulsion motors, sensors general ship electroconsumers reactive current, a reactive current regulators propeller motors matching the first and second force E, the block dividing, the first, second and third adders, electronic keys of synchronous generators and rowing motors, with sensors of jet current of rowing motors connected to the outputs of regulators of reactive current of rowing motors, the sensor of reactive current of general electric consumers is connected via the first matching amplifier to the first input of the dividing unit, the output of which is connected to the inputs of regulators of reactive current of rowing motors, the inputs of the first adder through electronic keys of the corresponding rowers electric motors are connected to the voltage sources, and the output is to one of the inputs of the second adder, the output of which is connected to the second input of the dividing unit, while the other input of the second adder is connected via the second matching amplifier to the output of the third adder generators connected to sources bearing stress