RU113088U1 - COMBINED POWER SUPPLY UNIT WITH DC BUS - Google Patents

Abstract

1. Combined power plant with a DC bus, characterized by the presence of the main and backup feeders for primary power supply, each of which is connected to the input device of the feeder, the presence of a diesel generator set connected to the input device of the diesel generator set, the outputs of the input devices of the feeders are connected to inputs of feeder voltage overvoltage threshold control devices, the outputs of which are connected to the feeder voltage filter inputs, the outputs of which are connected to the AC / DC inputs of voltage converters, one AC / DC voltage converter for each phase, the outputs of which are connected to the DC bus, input device output the diesel generator set is connected to the AC / DC inputs of the voltage converters, one AC / DC voltage converter per phase, the outputs of which are connected to the DC bus, the unit is characterized by the presence of an emergency shutdown switchboard for feeders, connected to the input devices of the feeders, to the input device of the diesel generator set and the DC release, threshold monitoring devices for exceeding the allowable voltage of the feeders and AC / DC voltage converters of the two input feeders are connected to the input device of the diesel generator set, the installation is also characterized by the presence of a battery, connected to the DC release, connected to the output of the automatic battery charger and through decoupling diodes connected to the DC bus, the input of the automatic charger

Description

The utility model relates to emergency or standby power supply schemes without automatic switching of power supply feeders for supplying loads with various DC voltages, single-phase or three-phase AC voltages, and can be used in systems with increased and special requirements for power stability, such as automation equipment railways, computer centers and data processing and storage centers, communication centers, equipment for managing the production process E, medical equipment, broadcast and satellite communication systems, data transmission systems, emergency lighting systems, security systems, financial systems, and other low-voltage electrical consumers from several independent single-phase / three-phase AC power feeders.

Known combined power supply uninterruptible power supply (UPS) (RF Patent No. 101280 from 01/10/2011), containing input feeders, input feeder devices with surge protection devices (one for each input) with remote control from the emergency shutdown panel, the first block control and switching of the feeder with protection of the control circuits of the state of the feeder from prolonged overvoltages, has a block for analyzing and selecting a priority feeder with control from a micro-computer, a contactor and a galvanic isolation device, a reserve uninterruptible power supply units (UPS), the second control and switching unit of the UPS (made on the basis of modern intelligent control systems of the UPS themselves with the highest technical characteristics), the external synchronization selection unit of the redundant UPS, the outputs of the first and second control and switching units of power supplies are inputs for the third block of control and switching of power supplies, power distribution unit, devices, display units of the current state of feeders, indication of statistics and the job feeder priority task switching delay feeders manual control blocks, a hardware-software system diagnostics and control of a hardware SPU measurement and control of the basic elements and install chains.

The disadvantages of this installation are:

- the use of expensive UBP, the operation of which is possible only at positive ambient temperatures;

- the use of input feeders, mainly of three-phase voltage to ensure the operation of the bulk of modern UBP;

- the inability to operate the installation from two single-phase feeders or from one three-phase feeder, and the second single-phase;

- UBP currently produced do not allow the construction of power plants of a wide range of designs with different technical characteristics, which does not allow to cover the existing needs of the energy consumption market;

- dips in the output voltage of the first stage of power supply during switching of input feeders, which, when the second stage of power supply is bypassed or when the output of the third stage of power supply is connected to the output of the first stage of power supply, causes dips in the output voltage of the installation, which may be unacceptable for a number of consumers of electricity;

- the use in the installation of electromechanical devices for switching feeders, which is accompanied by intense transients in the power circuits of the installation, the occurrence of an electric arc during switching loads, increased fire hazard of the installation;

- the use of a control and switching device in the first stage of power supply,

built according to the scheme of automatic input of a reserve (ATS) leads to rapid wear of contact groups of expensive electromechanical switching devices, since the instability of the input feeder parameters leads to frequent switching of contactors. Electromechanical switching devices have a low

maintainability and short service life, as these devices have a limited number of response cycles;

- high cost of operation of the installation, caused by the frequent replacement of electromechanical switching devices;

- the inability to connect devices to the DC bus of the UPS.

The objective of the utility model is to create a combined supply unit with a DC bus without switching feeders in the first stage of power supply

The technical result of using the developed utility model is to increase the reliability of the installation.

Reliability of work is ensured by creating an installation that, when powered by several single-phase / three-phase AC power sources, ensures uninterrupted power supply to installations with various technical characteristics.

A combined power supply unit with a DC bus is characterized in that it contains primary and backup feeders for primary power supply, each of which is connected to the input device of the feeder, a diesel generator unit connected to the input device of the diesel generator unit, the outputs of the input devices of the feeders are connected to the inputs threshold devices for monitoring the excess of the permissible voltage of the feeders, the outputs of which are connected to the inputs of the voltage filters of the feeders, the outputs of which are connected to odes of AC / DC voltage converters for one AC / DC voltage converter for each phase, the outputs of which are connected to the DC bus according to the hot standby circuit, the output of the input device of the diesel generator unit is connected to the inputs of AC / DC voltage converters for one AC / DC converter voltage for each phase, the outputs of which are connected to the DC bus according to the hot standby circuit. The feeder emergency shutdown switch is connected to the input devices of the feeders, to the input device of the diesel generator unit and the DC release, threshold devices for monitoring the excess voltage of the feeders and AC / DC voltage converters of two input feeders are connected to the input device of the diesel generator unit. The device is also characterized by the presence of a battery connected to a direct current release connected to the output of the automatic battery charging device and through decoupling diodes connected to the DC bus, while the input of the said automatic battery charging device is connected to the output of the input device of the main feeder, DC / DC voltage converters connected by inputs to the DC bus, and outputs according to the hot standby circuit to the loads m DC, DC / AC voltage converters connected by inputs to the DC bus, and outputs according to the hot standby circuit or according to the redundancy circuit by replacing the inputs of the automatic reserve input device, the output of which is connected to the surge protection device and to the switching inputs of the converters AC voltage, the outputs of which are connected to AC loads.

The installation is additionally equipped with a device for collecting, processing and displaying control and diagnostic information, which is connected with its inputs to the sensors of the state of the elements of the supply unit and sensors for monitoring the parameters of the electric power of the main circuits of the supply unit, the outputs of the device are connected to the inputs of the control device and exchange information with dispatch and remote monitoring systems, which with its outputs is connected to dispatch systems and remote monitoring.

Combined system includes feeder input devices, diesel generator set input device or feeder input device, feeder emergency shutdown switch, feeder threshold voltage excess monitoring devices, separate AC / DC voltage converters, separate battery (battery), separate battery automatic charge device batteries, direct current release, isolation diodes, direct current bus (DCB), separate non-synchronized (synchronized) DC / AC pre voltage generators generating single-phase / three-phase voltages, automatic reserve input devices (in case of unsynchronized DC / AC voltage converters), AC voltage converters, separate DC / DC voltage converters, surge protection devices and surge protective devices (SPD), collecting device, processing and displaying control and diagnostic information about the state of the installation elements, parameters of input feeders and outputs of the installation, control device and exchange and information with dispatching systems (DM), remote monitoring (UM) and management.

The inventive device is illustrated by the following graphic materials:

Figure 1 shows the structural diagram of the combined power supply unit with a DC bus SPUSHP, where the main feeder is 1, the backup feeder is 2, the diesel generator unit (DGA) or the additional feeder is 3, the input devices of the feeders (VUV) are 4, water DGA device (VUF-DGA) or VUF additional - 5, emergency shutdown switchboard (ShchAO) - 6, threshold devices for monitoring the excess voltage of feeders (PU) - 7, voltage filters for feeders (F) - 8, AC / DC feeder voltage converters 1-9, AC / DC feeder voltage converters 2. - 10, AC / DC converter voltage amplifiers DGA - 11, automatic battery charging device. - 12, DC / DC voltage converters - 13, DC / AC voltage converters - 14, automatic transfer switch AVR - 15, surge protection device and surge voltage (SPD) - 16, AC voltage converters - 17, collection, processing device and display of control and diagnostic information - 18, a control and information exchange device with dispatching systems and remote monitoring - 19, a direct current release.

Figure 2 shows the structural diagram of the device for automatic input of the reserve 15, where the power quality control device of the feeder - 21, the logic circuit of the switching control inputs - 22, the switch inputs - 23.

Feeders 1, 2 are intended for primary power supply of SPUSHP, while feeder 1 is the main, and feeder 2 is the backup.

The diesel-generator unit (DGA) or additional 3 feeder is intended for primary power supply of SPSHP from the DGA or from the additional feeder. When used as the third source of power supply of the DHA in the feed unit, VUF-DGA 5 is used.

When using an additional feeder as the third source of energy supply, instead of VUF-DGA, an additional VUF, additional PU and additional F.

The basic scheme of SUSHP is considered a scheme with two feeders of power supply and DGA according to Figure 1.

Feeder input devices 4 are designed to connect lead-in feeders, protect the installation from lightning and switching surge surges, control the insulation of electric cables, account for consumed electricity, remotely disconnect the feeder using ShchAO 6. VUV allows using the jumpers to select the input type (single-phase or three-phase) depending on the type of feeder of the primary power supply.

The VUF-DGA 5 feeder input device (for the option of connecting to the third input of the DGA power supply) is designed to connect the DGA, control the start / stop of the DGA, depending on the state of the threshold devices 7 for monitoring the excess of the allowable voltage of the feeder and the state of the AC / DC voltage converters 9, 10 two feeders, control of insulation of electric cables, metering of consumed electricity, remote emergency shutdown of the feeder with the help of ShchAO 6.

The emergency shutdown switch ShchAO 6 is designed for manual remote shutdown of input feeders 1, 2, DGA 3 and battery at the same time when a fire hazard occurs. Feeders are turned off using VUF-4, DGA is turned off using VUF-DGA-5, and batteries are disconnected using a DC release 20.

Threshold control devices for exceeding the permissible voltage of the feeders PU 7 are designed for continuous monitoring of the voltage level of the feeder, disconnecting the feeder from AC / DC voltage converters when the voltage of the feeder is higher than the maximum voltage and connecting the feeder to AC / DC voltage converters when the voltage of the feeder is reduced to a specified acceptable level, PUs also transmit information about their condition to the VUF DGA.

The voltage filters of the input feeders F 8 are designed to filter interference, voltage spikes of the input feeders and prevent possible destructive effects on AC / DC voltage converters from the side of the power supply inputs.

AC / DC voltage converters 9, 10, 11 are designed to convert the AC voltage of the input feeders and DGA into a constant voltage of the DC bus.

At the same time, AC / DC voltage converters are connected by inputs to each of the phases of the supply feeders, all of their outputs are connected to the DC bus of the ШПТ according to the hot standby circuit without the use of ABP devices and switching elements with mechanical and electrical interlocks. The construction of the first stage of power supply without switching elements with mechanical and electrical interlocks can significantly increase the reliability of the supply system, since with unstable parameters of the input feeders, frequent switching of feeders in the first stage of power supply, leading to the rapid deterioration of expensive switching devices and the failure of the installation. The electric power of AC / DC voltage converters is selected from the condition of maintaining the specified power of the supply unit when working from any two AC / DC voltage converters. Deep redundant power supply of ШПТ provides high reliability of power supply of plant loads. The use of modern AC / DC voltage converters allows you to refuse to turn off the input feeders when their voltage deviations exceed normalized 10%, since modern AC / DC voltage converters maintain the output voltage with high accuracy even when the specified range of input voltage deviations is repeatedly exceeded, only control remains exceeding the permissible voltage of the feeder, which can lead to damage to AC / DC voltage converters. AC / DC voltage converters provide galvanic isolation of ШПТ from the voltage of the input feeders of the supply unit.

The rechargeable battery (BAT) is connected to the ШП via a direct current release and decoupling diodes and provides autonomous power supply to the ШПТ for a predetermined time in case of complete absence of the ШПТ supply from the side of AC / DC voltage converters.

The automatic battery charging device 12 is powered by the output of the VUV of the first input and provides a charge and constant recharging of the battery with electric power of the main feeder.

DC / DC voltage converters 13 are designed to convert the DC voltage of the ШПТ into the direct current voltages, which are necessary for supplying the DC voltage of the control system. DC / DC voltage converters 13 provide galvanic isolation of the DC loads of the supply system from the SHPT. DC / DC voltage converters can be included in the hot-standby circuit.

DC / AC voltage converters 14 are designed to convert the DC voltage of the ШПТ into the single-phase / three-phase AC voltage, which is necessary for supplying the DC current loads of the control system. External synchronization DC / AC voltage converters can be switched on according to the hot redundancy scheme. Controls without external synchronization can be switched on by a redundancy backup circuit using the ATS 15 device, while switching inputs in this ATS only occurs if one of the DC / AC voltage converters fails. DC / AC voltage converters also provide galvanic isolation of AC loads of the supply system from the ШПТ.

The ABP 15 device is designed to control the quality of electric power of AC inputs (DC / AC outputs of voltage converters 14) and connect one of the inputs to the load, which meets the established requirements for electric power quality.

The surge protection device UZIP 16 is designed to protect the output of the supply unit from surge and switching overvoltages from the side of AC loads.

The AC voltage converters 17 are designed to convert AC voltage from the output of the ATS device to AC voltages, which are necessary to supply AC loads.

A device for collecting, processing and displaying control and diagnostic information 18 is intended to collect diagnostic information about the state of the elements of the supply unit. The device 18 is connected to the sensors of the state of the elements of the supply unit and sensors for monitoring the parameters of electricity of the main circuits of the supply unit. The device is intended for analysis and processing of information received, displaying information for service personnel, exchanging information with a data processing device and exchanging information with SD systems (dispatch systems) and PA (remote monitoring).

The control and information exchange device 19 with dispatching and remote monitoring systems is designed to control the elements of the power plant and exchange information with the device for collecting, processing and displaying control and diagnostic information 18, converting the received information and exchanging information with SD and PA systems.

The use of devices 18, 19 can provide both remote control and monitoring of the status of the control system and remote control of individual elements of the power plant.

The structural diagram of the device ABP 15 (Figure 1) is shown in Figure 2.

In accordance with Figure 2, the ABP device may have input quality control devices for inputs 21, input switching switching logic 22, input switch 23.

The inventive combined feeding installation is characterized by:

1. The lack of switching feeders in the first stage of power supply.

2. The use of DC bus, providing the connection of the necessary individual devices of the power plant.

3. Deep redundancy of DC bus power.

4. The construction of the power plant without the use of UBP.

5. Construction of a power supply unit on separate power supply devices:

- AC / DC voltage converters;

- battery;

- automatic battery charging device;

- DC / DC voltage converters;

- DC / AC voltage converters;

- devices for collecting, processing and displaying control and diagnostic information;

- a control device, data processing and information exchange with SD and PA systems.

6. The ability to build a power plant in accordance with the given technical specifications in terms of power, battery life, resistance to mechanical and climatic influences, size and design.

7. The ability to power the unit from single-phase power supply feeders, three-phase power supply feeders, from heterogeneous (single-phase and three-phase simultaneously) AC power feeders.

8. The ability to build a power plant with single-phase or three-phase, redundant or non-redundant AC output voltage.

9. The ability to supply loads with redundant or non-redundant DC voltage from DC / DC voltage converters or directly from a DC bus.

The combined power supply unit with a DC bus allows you to provide a wide range of consumers with uninterrupted power supply of high-quality single-phase / three-phase alternating current when supplying SUSHP from single-phase / three-phase AC power sources and significantly increase the reliability of the power supply.

Thus, the inventive combined power supply unit with a DC bus, built using non-standard technical solutions without automatically switching the power feeders, can significantly increase the reliability and quality of the power supply of the loads, has a high degree of survivability in the conditions of failure of the component elements and provides high power characteristics of consumers with increased and special requirements for power stability.

Claims (7)

1. Combined power supply unit with a DC bus, characterized by the presence of the main and backup feeders for primary power supply, each of which is connected to the input device of the feeder, the presence of a diesel generator unit connected to the input device of the diesel generator unit, the outputs of the input devices of the feeders are connected to inputs of threshold devices for monitoring the excess voltage of feeders, the outputs of which are connected to the inputs of the voltage filters of feeders, the outputs of which are connected are connected to the inputs of the AC / DC voltage converters by one AC / DC voltage converter for each phase, the outputs of which are connected to the DC bus, the output of the input device of the diesel generator unit is connected to the inputs of the AC / DC voltage converters by one AC / DC voltage converter to each phase, the outputs of which are connected to the DC bus, the installation is characterized by the presence of an emergency feeder switchboard connected to the input devices of the feeders, to the input device of the diesel generator the unit and the direct current release, threshold devices for controlling the excess voltage of the feeders and AC / DC voltage converters of the two input feeders are connected to the input device of the diesel generator unit, the installation is also characterized by the presence of a battery connected to the direct current release connected to the output of the automatic charging device battery and through decoupling diodes connected to the DC bus, the input of the automatic charging device and the battery is connected to the output of the input device of the main feeder, DC / DC voltage converters connected to the DC bus inputs, and outputs of the hot standby circuit to DC loads, DC / AC voltage converters connected to the DC bus inputs, and outputs - to the inputs of the automatic reserve input device, the output of which is connected to the surge protection device and to the inputs of AC voltage converters, outputs to toryh connected to the AC loads. 2. The combined power supply unit with the DC bus according to claim 1, characterized in that it further comprises a device for collecting, processing and displaying control and diagnostic information, which is connected by its inputs to the sensors of the state of the elements of the power supply and sensors for monitoring the parameters of the electric power of the main supply circuits installation, and the outputs are connected to the inputs of a control and information exchange device with dispatching systems and remote monitoring. 3. The combined power supply unit with the DC bus according to claim 1, characterized in that the power supply feeders are connected to AC / DC voltage converters through threshold feeder excess voltage monitoring devices without the use of automatic feeder switching. 4. The combined power supply installation according to claim 1, characterized in that the outputs of the AC / DC voltage converters are connected to the DC bus according to the hot standby circuit. 5. The combined supply unit according to claim 1, characterized in that the DC / DC voltage converters are connected by outputs according to the hot standby circuit to DC loads. 6. The combined supply unit according to claim 1, characterized in that the DC / AC voltage converters are connected by outputs according to the hot standby circuit or according to the redundancy circuit by replacing the inputs of the automatic reserve input device. 7. The combined power supply unit with the DC bus according to claim 1, characterized in that the automatic reserve input device for redundancy by replacement includes an input power quality control device, input switching switching logic circuit and input switch.