SK9657Y1 - Connection for increasing the reliability of the power supply system - Google Patents

Abstract

The connection for increasing the reliability of the power supply system consists of main power supply (1), independent power supply (2), backup system (3) as a voltage restorer, blocks (4) and (5) for current measuring, bi-directional switches (6) and (7), sensitive load (8) and control system (9). This connection is used to increase the reliability of the power supply. During of the power outage, backup power supply is connected, it acts also as a voltage restorer.

Description

The field of technology

The subject of the utility model is a connection to increase the reliability of the power supply system intended for uninterrupted power supply of sensitive electrical appliances. The technical solution falls into the field of power electronics.

Current state of the art

A large number of electronic devices are sensitive to the failure of the supply of electricity, or to its fluctuation. Among such devices are especially communication devices, airport systems, medical devices and devices where, in the event of a failure or interruption of the supply of electricity, human lives could be endangered. Another type of equipment that requires a continuous supply of electricity is also computers and data storage, where important data could be lost in the event of a power failure or interruption. Last but not least, even in many continuous production systems, such as paint shops, if the supply of electricity is interrupted, the products themselves or the production system itself could be damaged and, consequently, large financial losses.

In order to avoid the unwanted consequences of a power failure or fluctuation in the given equipment, it is necessary to use a redundant power supply system, i.e. a system that evaluates the fault condition in time and ensures its further trouble-free and safe operation. These systems usually work on the principle of backup by a reserve source of electricity, for example from a separate independent power line, or by an external source of electricity - a battery. In the case of very important systems, the backup process is multiple. The principle of operation is based on the fact that the given device is powered simultaneously from the main source of electricity, which supplies power to the device, but also from an independent backup source. Both sources work in parallel until the moment of failure, i.e. power failure of the main source. At that moment, the main source is disconnected, but energy is still supplied to the device via a backup source, which takes over the entire supplied power. In this way, the device continues to work without interruption, until the batteries run out or the power supply is restored by the main source. The operation time of the backup source is determined by many parameters (such as battery capacity, supplied power, operation limitation...).

In the case of cheap/low-quality backup sources, there is also an inharmonic voltage at the inverter output, or a 50 Hz filter (large, heavy, expensive) is used.

The use of a backup system is determined by the requirements of the powered device, while three models of the principle of operation of backup sources are available:

Off-line: power is supplied to the device from the mains, but in the event of an outage, the power is redirected via a switch to a battery-powered backup source. The backup circuit does not work continuously, therefore the restoration of the energy supply is accompanied by a short-term outage or drop in voltage. This backup method is only suitable for low-sensitivity devices with low power, but it is highly efficient, cheap and small.

Line-interactive: power is supplied to the device from the mains, but in the event of an outage, the power is redirected via a switch to a battery-powered backup source. The backup circuit already works continuously, therefore the restoration of the energy supply is ensured much faster and with only a minimal drop in voltage compared to an off-line system. This backup method is suitable for servers and communication devices with higher performance, but it has high efficiency, is cheap and small. On-line: energy is permanently supplied to the device via a backup source that is powered from the network. At the moment of a network failure, there is no power failure or voltage drop, only the charging of the backup source is interrupted. After the power is restored, the charging of the backup power is resumed again. This backup method is suitable for the most sensitive devices, but has lower efficiency, high cost and limited operation time.

The essence of the technical solution

The stated shortcomings of the state of the art, such as short-term disconnection of the load from the power supply, inharmonic voltage, a large, heavy, expensive filter and limited operating time, are solved by the presented technical connection solution to increase the reliability of the power supply system, whose principle of operation ensures the continuous supply of electrical energy to the powered device. The connection to increase the reliability of the power supply system uses a modern voltage inverter with width pulse modulation for its operation, which does not need such a bulky, heavy and expensive output filter and, in addition, ensures the correct operation of the powered device even in the event of fluctuations in the supply voltage, as it has a voltage restorer function.

The essence of the technical solution is that both systems, i.e. the network and backup source, work in parallel. In the event of a power outage, the device will continue to be powered via a backup source. With the help of fast two-way switches, the faulty part is disconnected, which significantly increases the reliability of the entire power supply system for phase- and amplitude-sensitive appliances in continuous production. In addition, a short-term outage or voltage drop in the network, which can fluctuate dynamically with the supply voltage of the powered device, is compensated by a backup source with a voltage restorer function. This is ensured by fast regulators and sensing the shape of the voltage and current of the powered device, while the backup source is able to quickly switch between sources.

Wiring to increase the reliability of the power supply system consists of three parts.

The first part - the main power part, is made up of the main power supply, which is connected to the powered load through the measuring block and the two-way switch. During normal operation, the main power supply supplies power to the load.

The second part is made up of an independent power supply that powers the backup system with the voltage restorer function. This part is also connected in parallel to the powered load through the measuring block and the two-way switch, while supplying energy to the load only in the event of a failure or fluctuation of the voltage of the main power supply. Since both systems work in parallel, and thanks to fast two-way switches, there is no delay when switching individual power sources. The backup system with the voltage restorer function detects the shape of the voltage and current of the powered device and switches between the individual sources according to the requirements with the help of fast regulators.

The third part is the control system, which senses the voltage of the main source, the currents of the main source and the backup system with the voltage restorer function, based on which it controls the backup system with the voltage restorer function. The control system includes fast dead-beat regulators, which control the two-way switches through which the individual sources are connected to the powered device.

An essential feature of the connection is the increase in the reliability of the power supply system, which ensures a continuous supply of electricity to the powered device without possible delays or short-term outages or drops, or voltage fluctuations thanks to the function of the voltage restorer, which detects the shape of the voltage and balances any voltage and current differences from the backup source. Furthermore, it does not contain such a large, heavy and expensive 50 Hz filter thanks to the use of a modern voltage inverter with pulse width modulation, which operates at a higher switching frequency compared to thyristor or older types of sources.

Another advantageous feature is the possibility of dividing the power supply between the network and the UPS (Uninterruptible Power Supply) source in any ratio, e.g. 50: 50%. In the case of energy saving, a higher ratio is possible in terms of supply from the network, e.g. 90: 10%, when the UPS source works practically empty.

Overview of images on drawings

In fig. 1 shows a block diagram of the connection to increase the reliability of the power supply system.

Implementation examples

Connection to increase the reliability of the power supply system according to fig. 1 consists of the main power supply 1, which is connected via the current measurement block 4 to the bidirectional switch 6, by means of which it is connected to the sensitive load 8. The independent power supply 2 is connected to the backup system 3 with the voltage restorer function, which is subsequently via block 5 current measurement connected to bidirectional switch 7, by means of which it is connected to the sensitive load 8. Data on the value of the voltage of the main power supply 1, the current of the main power supply 1 from the block 4 of the current measurement and the current of the backup system 3 with the function of the voltage restorer from the block 5 the current measurements are fed to the control system 9, which, based on them, controls the backup system 3 with the voltage restorer function, and at the same time, with the help of fast dead-beat regulators, it controls the two-way switches 6 and 7, which quickly switch individual sources. In the event of a voltage fluctuation of the main power supply 1, the voltage of the sensitive load 8 is compensated from the backup system 3 with the voltage restorer function.

Industrial applicability

Connection to increase the reliability of the power supply system can be used especially in cases of powering sensitive electronic appliances, such as computers, communication devices, but also continuous 5 production systems, such as paint shops and the like, and it is particularly suitable for use, for example, when powering medical devices. The mentioned solution not only prevents the interruption of the supply of electricity to the given appliance, but also has a voltage restorer function, so it is able to cover possible voltage fluctuations in the network.

List of relationship tags

- main power supply

- independent power supply

3 - backup system with voltage restorer function

- current measurement block

- current measurement block

- two-way switch

- two-way switch

8 - sensitive load

- control system

Claims (4)

1. Connection to increase the reliability of the power supply system consisting of the main power supply (1), independent power supply (2), backup system (3) with the function of voltage restorer, blocks (4) and (5) current measurement, two-way switches (6) and (7), a sensitive load (8) and a control system (9), characterized in that the main power supply (1) is connected via the current measurement block (4) to the two-way switch (6) by means of power wires connected to a sensitive load (8), with the help of power wires, an independent power supply (2) is connected to a backup system (3) with the function of a voltage restorer, which is subsequently connected to a two-way switch (7) through a current measurement block (5) with the help of which is connected to a sensitive load (8), using signal wires the main power supply (1) is connected to the control system (9) for sensing its voltage, while blocks (4) and (5) are connected to the control system (9) using signal wires ) current measurement for current measurement in the main power supply (1) and the backup system (3) with the voltage restorer function, the control system (9) is connected by means of signal wires to the backup system (3) with the voltage restorer function for its control and also to the two-way switches (6) and (7) to control them. 2. Connection to increase the reliability of the power supply system according to claim 1, characterized in that the main power supply (1), the independent power supply (2) and the backup system (3) with the voltage restorer function are connected as working in parallel. 3. Connection to increase the reliability of the power supply system according to claim 1, characterized in that the backup system (3) with the voltage restorer function contains fast dead-beat regulators. 4. Connection to increase the reliability of the power supply system according to claim 1, characterized in that the power supply is divided between the main power supply (1) and the independent power supply (2) in a set ratio.