RU148724U1 - UNINTERRUPTIBLE POWER SUPPLY WITH AUTOMATIC START-UP OF BACK-UP POWER SUPPLY - Google Patents

Abstract

1. An uninterruptible power supply device, which contains at least two inputs for connecting single-phase and / or three-phase alternating current lines, characterized in that it contains a feeder control device that controls the operation of contactors through which each of the inputs for connecting single-phase lines and / or three-phase alternating current connected to the busbar, which in turn is connected to at least two rectifiers, and the outputs of the rectifiers are connected in parallel and connected to the DC bus voltage a voltage of 48 V, which is connected to at least one battery and an inverter system comprising at least one inverter module, which consists of at least two inverters for supplying a single-phase load or at least three inverters to power a three-phase load, alternating voltage from each of which is supplied to alternating current consumers to the device outputs galvanically isolated from the input lines. 2. The uninterruptible power supply device according to claim 1, characterized in that for connecting a backup power source, a DGA input is provided, which connects directly to the busbar. The uninterruptible power supply device according to claim 1, characterized in that the output of the guaranteed loads is connected to the power supply bus through the contactor. The uninterruptible power supply device according to claim 1, characterized in that it contains an emergency recovery bypass, the power supply of which is connected directly to the power sources and to the output of the device.

Description

The proposed technical solution relates to electrical engineering, in particular to uninterruptible power supply devices (UPS) with automatic inclusion of backup power and is intended for uninterrupted power supply to various consumers.

It is known UBP (RU 79218 U1, with priority dated 05/15/2008), containing at least 2 inputs for connecting single-phase or three-phase alternating current lines, each of which is connected to its rectifier module, containing at least 2 rectifiers when connected to a single-phase line , or at least 3 rectifiers when connected to a three-phase line, and the outputs of the rectifier modules are connected in parallel and through a DC power device with at least one battery, connected to an inverter system containing at least m Here, 2 modules of inverters connected in parallel and each of which consists of at least 2 inverters for supplying a single-phase load, or at least 3 inverters for supplying a three-phase load, AC voltage from each of which is supplied to AC consumers to the outputs of the device galvanically isolated from the input lines. 5 cp f-ly, 2 ill.

The disadvantage of such a UBP is the limited use, for example, connecting only single-phase or three-phase networks to power supplies; there is no possibility of connecting a backup source of DGA (diesel generator set); increased number of rectifiers; no output for connecting guaranteed loads.

The technical result achieved by using the proposed UBP is:

- the ability to install UBP in various places, including the existing ZhAT power supply systems (Railway automation and telemechanics) with minimal installation costs, which is achieved by the modular design, compactness of the device, ease of manufacture and installation;

- there is no need to install additional devices for forming the busbar and connecting redundant power supplies;

- the ability to power loads that do not require uninterrupted power (guaranteed loads);

- the ability to easily and quickly in time to form the necessary configuration of the power system (increase the power and / or capacity of the batteries, etc.) due to the simple, convenient, quick layout and “hot swap” of all power modules without turning off the device;

- expanding the functionality of UBP due to the possibility of supplying individual loads from various AC networks with the simplicity and reliability of the device;

- reduces the need for additional electrical safety measures due to the low voltage of the DC bus (48 V), which is used alone, but with a double conversion topology;

- the ability to power three-phase devices when powered from a single-phase network through the use of double conversion topology with a single DC bus;

- the uninterruptible power supply device is designed in such a way that the output alternating voltage is stabilized in frequency and amplitude, due to the construction of the main functional elements.

These technical results are achieved by the proposed uninterruptible power supply device, which contains at least two inputs 1, 2 for connecting single-phase and / or three-phase alternating current lines. In this case, the control unit contains a feeder control device (UKF) 14, which controls the operation of the contactors KM1, KM2, KM3, through which each of the inputs for connecting single-phase and / or three-phase alternating current lines is connected to the busbar 5, which in turn is connected as at least with two rectifiers 6, and the outputs of the rectifiers are connected in parallel and connected to a DC bus 7 with a voltage of 48 V, which is connected to at least one battery 12 and a system of inverters 8 containing at least one inverter module orors, which consists of at least two inverters for supplying a single-phase load or at least three inverters for supplying a three-phase load, an alternating voltage from each of which is supplied to alternating current consumers to the outputs of the device 11 galvanically isolated from the input lines.

In a preferred embodiment of the uninterruptible power supply device, a DGA input 3 is provided for connecting a backup power source, which is connected directly to the busbar 5.

In another preferred embodiment of the uninterruptible power supply device, a power output of guaranteed loads 10 is connected to the busbar 5 through the contactor KM3 and the guaranteed power bus 9.

In another preferred embodiment of the uninterruptible power supply device, it contains an emergency recovery bypass Q1, the power supply circuit of which is connected directly to the power sources of the inverters 8, the input of the DGA 3, and through the input circuit breakers QF1 and QF2 to the inputs 1, 2, and to the output device 11.

All the main functional elements - rectifiers and inverters are interconnected in parallel.

The uninterruptible power supply device according to the proposed technical solution is made with the possibility of connecting two independent power sources and one backup, full backup of rectifiers and inverters, due to the presence in each module of an excessive number of rectifiers or inverters N + 1.

An uninterruptible power supply device may have the function of automatic and / or manual bypasses, providing direct connection of the load to the busbar.

The uninterruptible power supply device in the preferred embodiment is made according to the principle of a modular structure with a variable composition of the main functional elements - rectifiers and inverters.

Each of the inputs is designed for the full load of the system, provided that the total power does not exceed the rated power.

The essence of the uninterruptible power supply is illustrated by the functional diagram in figure 1, where

1, 2 - inputs for connecting lines of single-phase or three-phase alternating current,

3 - input DGA,

4 is a control diagram,

5 - bus,

6 - rectifiers

7 - DC bus,

8 - system of inverters,

9 - bus guaranteed power,

10 - guaranteed power supply output,

11 - output device

12 - rechargeable batteries,

13 - introductory protective device (VZU),

14 - device control feeder (UKF),

QF1, QF2 - input circuit breakers,

KM1, KM2, KM3 - contactors,

Q1 - emergency recovery bypass,

Q2 - automatic and manual bypass,

The uninterruptible power supply device in Fig. 1 is made according to the principle of a modular design with a variable composition of the main functional (power) blocks and elements - rectifiers and inverters and the possibility of full backup of the data of the main functional (power) devices (rectifiers and inverters), due to the presence in each block an excessive number of these functional (power) devices (rectifiers and inverters) N + 1, and consists of:

- Input circuit breakers QF1 and QF2 with remote shutdown function designed to connect external sources, an input protective device (VZU) 13 designed to protect against external interference, a feeder control device (UKF) 14 which controls the operation of contactors through a control circuit 4, the outputs of which connected in parallel and form a busbar 5.

- Rectifiers 6 are connected to the busbar 5, the outputs of which are connected in parallel, and also through the KM3 contactor the power supply of guaranteed loads is 10. The total number of rectifiers is determined by the load power of the consumer. Under normal conditions (in the presence of voltage), the rectifiers convert the alternating voltage of the network into a constant voltage, which is supplied to the inverters 8 and the batteries 12.

- Inverters 8 convert the DC voltage back into a frequency and amplitude-stabilized output alternating voltage, which is then supplied to the AC consumers - to the outputs of the device 11. In the absence of an input voltage, the inverter is powered by a battery. After power is restored, the rectifier automatically takes over the power of the inverter and charges the battery.

- The control circuit is intended for general control of the operation of power supply systems. It can consist of a controller unit, a switching unit, an indication unit and a control unit, and control of input and output parameters. It carries out continuous monitoring and data transfer to the monitoring system.

The UPS has the function of automatic and manual bypasses (Q2) providing direct connection of the load to the busbar in case of inverter malfunction. The automatic bypass switches are high-speed keys located inside the inverters. Manual bypass switches are cam switches with additional low-current contacts that reflect the true position of these switches.

For emergency power recovery of uninterruptible power supply, an emergency recovery bypass Q1 is provided that provides a direct connection of the load to the input network. Manual bypass switches are cam switches with additional low-current contacts that reflect the true position of these switches.

Work UBP.

The UPS is powered from a four or five-wire network of three-phase alternating current 380 V (permissible deviations + 30 / -40%) with a frequency of 50 Hz (permissible deviations + 2.5 / -2.5%) or from a single-phase alternating current network with voltage 220 V ( permissible deviations + 30 / -40%) with a frequency of 50 Hz (permissible deviations + 2.5 / -2.5%). If the network deviates beyond the specified parameters, the power is supplied from the battery, while in case of voltage dips, the transition to the load power from the battery does not impair the quality of functioning.

UBP can withstand without damage pulsed overvoltages in each phase up to 4000 V with duration up to 50 μs.

In the normal mode of operation of the UPS, the rectifiers 6 supply the inverters 8 with direct current and support the charge of the batteries 12. In the event of a complete loss of AC power, the inverters 8 are powered by the battery 12. In case of partial (one or more phases) AC power failure or undervoltage the phases of the feeders and the absence or malfunction of the DGA, the UPS by the KM3 contactor disconnects the power output circuits of the guaranteed loads 10 and connects the faulty feeder to power the rectifiers 6. The power of the rectifiers can not enough to power inverters. In this case, the missing power is taken from the battery.

Depending on the characteristics of the input voltage, the contactors KM1 and KM2 connect the feeder to the busbar 5.

When the values of the supply voltage exceed normal limits, the power switches automatically, the faulty source is disconnected from the busbar, and then a working power supply is connected, the busbar rectifiers are converted to DC voltage by the rectifiers of the UPS, which is supplied to the inverters and rechargeable batteries.

The KM3 contactor switches the guaranteed power supply circuit depending on the selected power mode (the KM3 contactor operation mode is set by jumpers depending on the phase of the feeders and the load power circuit) of the guaranteed loads, the condition of the feeders and the presence and condition of the DGA.

If the loads are connected via a three-phase power supply and both feeders are three-phase, then KM3 works as a repeater KM1 or KM2. If one of the feeders is single-phase, it is preferable to choose a single-phase power supply circuit for guaranteed loads (to supply guaranteed loads through single-phase transformers). With such a power supply circuit (single-phase load), the KM3 contactor works as a KM1 or KM2 repeater; if the load is three-phase, it is configured in such a way that when the system switches to power from a single-phase feeder, the KM3 contactor is turned off (the possibility of connecting three-phase guaranteed load circuits to a single-phase feeder is excluded ) If there is a working three-phase DGA, the KM3 contactor is connected to the busbar after starting the DGA and turning it on under load. If the DGA is single-phase, then the KM3 contactor operates depending on the selected load power mode.

Inverters convert the DC voltage back into a frequency and amplitude-stabilized output AC voltage, which is then fed to AC consumers. In the absence of input voltage, the inverters are powered by batteries. After the power is restored, the rectifier automatically takes over the power of the inverter and, in addition, charges the battery again, so that in the event of a reverse voltage failure, the power is supplied back to the batteries.

In the event of a malfunction of both power sources (feeders), a transition to power from the backup power supply of the DGA occurs.

The ability to connect in parallel allows you to configure a system with N + 1 redundancy.

Claims (4)

1. An uninterruptible power supply device, which contains at least two inputs for connecting single-phase and / or three-phase alternating current lines, characterized in that it contains a feeder control device that controls the operation of contactors through which each of the inputs for connecting single-phase lines and / or three-phase alternating current connected to the busbar, which in turn is connected to at least two rectifiers, and the outputs of the rectifiers are connected in parallel and connected to the DC bus voltage a voltage of 48 V, which is connected to at least one battery and an inverter system comprising at least one inverter module, which consists of at least two inverters for supplying a single-phase load or at least three inverters to power a three-phase load, an alternating voltage from each of which is supplied to alternating current consumers to the device outputs galvanically isolated from the input lines. 2. The uninterruptible power supply device according to claim 1, characterized in that for connecting a backup power source, a DGA input is provided, which connects directly to the busbar. 3. The uninterruptible power supply device according to claim 1, characterized in that the guaranteed power supply output is connected to the power supply bus through the contactor. 4. The uninterruptible power supply device according to claim 1, characterized in that it contains an emergency recovery bypass, the power supply of which is connected directly to the power sources and to the output of the device.

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