RU187219U1 - VOLTAGE STABILIZER WITH INVERTER FOR MOBILE COMPOSITION - Google Patents

Abstract

The utility model relates to the field of energy and electrical engineering, in particular to devices for converting electromechanical energy into electrical energy, and can be used as a power source in power systems of autonomous electric power complexes.

A promising direction is the development and implementation of power plants based on an autonomous power supply system (SAE) with a generator-driven installation from the axis of the wheelset of the rolling stock carriage.

The technical result achieved is achieved by the fact that the voltage of a synchronous generator (SG) of an unstable frequency is supplied to the input of an inverter frequency converter (IF), the output of which feeds a load switching unit (BKN) (refrigerators) with a stable voltage through a higher harmonic filter (FHG). Synchronization of the generator on a common AC bus and coverage of peak power consumption is ensured by the battery (AB) connected to the auxiliary power supply unit (BPSN). When excess generated energy is accumulated through the charger (charger), the battery is recharged.

Description

The utility model relates to the field of energy and electrical engineering, in particular to devices for converting electromechanical energy into electrical energy, and can be used as a power source in power systems of autonomous electric power complexes.

The power supply system, being one of the main parts of autonomous objects, determines their reliability, efficiency, maintainability and terms of active functioning.

A promising direction is the development and implementation of power plants based on an autonomous power supply system (SAE) with a generator-driven installation from the axis of the wheelset of the rolling stock carriage.

A known system of autonomous power supply of railway freight cars and / or platforms from the axis of the wheelset (patent RU 130557 U1). Refrigerated rolling stock and platforms for transporting refrigerated containers should have an electric power source, which can be a subcar generator that provides the possibility of autonomous power supply of platforms or wagons when passing straight and curved sections of the track, as well as turning off the drive when empty runs.

Generator-driven units for three-element freight carts of fitting platforms are also known (Bulletin of the Research Institute of Railway Transport, No. 5, 2014). The composition of the SAE includes a synchronous three-phase generator and a frequency converter, ensuring the operation of two standard refrigeration modules with a total electric power of 16 kW in the entire speed range of the platform from 30 to 120 km / h.

Known MICROHES systems with a static frequency converter (Journal "Modern problems of science and education", No. 6, 2014). The main indicators of the quality of electricity in accordance with GOST 13109-97 include the parameters of the output voltage, characterized by a nominal value and frequency. Therefore, the most important element of the SAE is the stabilization system, which provides a statically stable mode of operation of the system and stabilization of the output voltage.

The objective of the presented utility model is to ensure the dynamic stability of the system during transient conditions that occur during load surges.

The technical result is to increase the installation efficiency and voltage stability on the AC bus loads.

The technical result achieved is achieved by the fact that the voltage of a synchronous generator (SG) of an unstable frequency is supplied to the input of an inverter frequency converter (IF), the output of which, through a higher harmonic filter (FHG), supplies a stable voltage to the load switching unit (BKN) (refrigerators). The synchronization of the generator on a common AC bus and the coverage of rare peak power consumption is ensured by a rechargeable battery (AB) connected to the auxiliary power supply unit (BPSN). When excess generated energy is accumulated through the charger (charger), the battery is recharged.

BRIEF DESCRIPTION OF THE DRAWING

Signs and advantages of this technical solution will become apparent from the following detailed description and the attached drawing, which shows the structural diagram of the device (Fig. 1).

LIST OF DESIGNATIONS

GF1 ... GF4 - circuit breakers;

1. Network;

2. BPSN - power supply unit;

3. SG - synchronous generator;

4. OV - excitation winding of the generator with slip rings;

5. BRV - excitation regulator block;

6. BC - switching unit;

7. BRBN - block of regulated ballast loads;

8. IF - frequency converter block;

9. FVG - filter of higher harmonics;

10. PSU - bypass circuit;

11. BKN - load switching unit;

12. KG - generator contactor;

13. AB - rechargeable battery;

14. Memory - charger;

15. K - control system controller;

16. IUSH - measuring and control bus of the controller;

17. N - heater;

18. In - a fan.

The described voltage stabilization device with a frequency converter has three operating modes:

power mode from a synchronous generator;

power mode from an external industrial three-phase network 380 V, 50 Hz;

bypass supply mode.

The power mode from the synchronous generator car driven by the axis of the wheelset is the main one and is used during the movement of the platform. In this case, the circuit breakers GF2 and GF4 are turned on, and GF1 GF3 are turned off. At the initial moment, the voltage from the network is supplied to the auxiliary power supply unit (BPSN) 2 and provides a constant voltage of +110 V to the excitation regulator block (BRV) 5. After the platform starts moving, the network 1 opens and the +110 V voltage at the BPSN output is maintained by battery power batteries (AB) 13. If the composition picks up speed and the speed does not fall within the set time, then the generator contactor (KG) 12 is turned on, connecting the generator to the input of the frequency converter (IF) 8. The filter of higher harmonics (FHG) 9 allows the lawsuit remove high-frequency harmonics of the order of 5, 7, 11 from the fundamental harmonic of 50 Hz at the output of the converter, providing a total harmonic coefficient in the output voltage of not more than 5%. In all operating modes, the voltage is supplied to the auxiliary power supply unit (BPSN) 2, which, when parked, is supplied with power from the mains and charges the battery (АБ) 13 through the charger (charger) 14 and the controller’s power supply (K) 15. auxiliary power supply unit (BPSN) 2 is supported by alternating output voltage of the generator (SG) 3 380 V through a closed circuit breaker (GF4). The block of adjustable ballast loads (BRBN) 7 (heater 17 and fan 18) is powered by BPSN 2 with a constant voltage of + 110 V. The load switching block (BKN) 11 provides alternate or joint connection of refrigerators (refrigeration modules) through its contactors. When the first contactor is switched on, the power consumed by one refrigerator is measured. Then the first refrigeration module is turned off, the second is turned on and the power consumption is also measured. If the total power consumption does not exceed the output power of the frequency converter, then both refrigerators are switched on, if it exceeds, the refrigerators turn on alternately. The excitation control unit (BRV) 5, by changing the current in the field coil (OB) 4, maintains the voltage at the generator output with a given accuracy over the entire range of the composition speed.

The power mode from an external three-phase network is used for long-term parking of the platform. This mode is activated by turning on the machines GF2 and GF3, while the machines GF1, GF4 must be turned off. The switching unit (BC) 6 connects the power supply of the network 1 to the input of the frequency converter (IF) 8 to check the operability of the converter in the parking lot.

In bypass mode, the load is connected to the external network by the GF1 machine without connecting to the frequency converter (IF) 8. At the same time, the GF3, GF4 machines must be turned off.

The controller (K) 15 of the control system of the device with its measuring and control bus (IUSh) 16 provides the necessary algorithm for the operation of the device.

Claims (1)

A voltage stabilization device with an inverter for rolling stock, made with the possibility of connecting to a subcar synchronous generator (SG) having a gearbox connection with the wheel axis of a carriage trolley, consisting of: excitation control unit (BRV), acting on the excitation winding current (OB) of a synchronous generator with slip rings; auxiliary power supply unit (BPSN) providing power supply with a constant voltage of +110 V excitation control unit (BRV) and an adjustable ballast load unit (BRBN); an inverter frequency converter (IF), the output of which is connected to the load switching unit (BKN) through a higher harmonic filter (HF); a switching unit (BC) for connecting the 380 V network in the standby mode to the input of the frequency converter (IF); generator contactor (KG), connecting the generator to the input of the frequency converter (IF) when the device exits to the specified mode of movement of the train; a rechargeable battery (AB) connected to the auxiliary power supply unit (BPSN) and providing power to the unit at the beginning of the overclocking process, as well as covering peak power consumption in transients; a charger (charger), providing recharge of the battery (AB) in the process of moving the platform with the output voltage of the generator (SG); block of adjustable ballast loads (BRBN), the power of which is provided from the auxiliary power supply unit (BPSN) with a constant voltage of +110 V; a bypass circuit connecting the mains directly to the load in the standby mode; the controller (K) of the device control system that implements the algorithm of the system the measuring and control bus of the controller (IUSH), which provides the measurement of electrical quantities and the transfer of control actions from the controller to individual units of the device.

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