KR20240085981A - Reactive power adjustment system and method in connection with retention voltage reduction - Google Patents

Abstract

For efficient power factor adjustment of low-voltage industrial loads, a reactive power adjustment device and system linked to conservation voltage reduction within the consumer is provided. A reactive power adjustment system in conjunction with conservation voltage reduction according to an embodiment of the present invention includes a plurality of loads connected to a busbar; and a first reactive power adjustment device that receives and analyzes power quality information collected from the first CT (Current Transformer) installed on the busbar and adjusts reactive power based on the analysis results. As a result, it is possible to not only adjust reactive power using only the power quality information collected from the CT (Current Transformer), but also analyze information from the upper energy management system (conservation voltage reduction operation system).

Description

Reactive power adjustment system and method in connection with retention voltage reduction}

The present invention relates to a reactive power adjustment system and method for low-voltage industrial loads, and more specifically, to a reactive power adjustment device and system linked to conservation voltage reduction within the customer for efficient power factor adjustment of low-voltage industrial loads.

One of the existing methods of adjusting reactive power is to control reactive power in an on/off form by installing capacitors in facilities according to the characteristics of industrial companies that are ground loads.

In addition, another method of controlling reactive power is to install an inverter-type reactive power adjustment device and control the reactive power by switching semiconductor devices based on information at the measurement point.

These methods have the difficulty of installing a fixed capacity capacitor tailored to each facility or adjusting reactive power based on a single measurement point, and when introducing optimal voltage control technology in real time to save energy in industry, Problems such as changes in the operating characteristics of devices that require reactive power may occur.

In addition, existing reactive power control devices include SVC with or without condensers and reactors depending on the facility configuration, and STATCOM using a voltage-type converter, but most of them are extra-high voltage facilities and occupy a large area, resulting in initial introduction cost for consumers, There are burdens such as footprint, maintenance, and difficulty in introducing a load-side distribution form suitable for low-voltage industrial loads.

The present invention was created to solve the above problems, and the purpose of the present invention is not only to adjust reactive power using only power quality information collected from CT (Current Transformer), but also to adjust the upper energy management system (conservation voltage reduction operation system). ) is to provide a reactive power adjustment system and method that can analyze information on whether the conservation voltage is reduced.

In addition, another object of the present invention is to provide a reactive power adjustment system and method that facilitates capacity expansion in a modular form by providing a distributed system configuration rather than a centralized system.

According to an embodiment of the present invention for achieving the above object, a reactive power adjustment system linked to conservation voltage reduction includes a plurality of loads connected to a busbar; and a first reactive power adjustment device that receives and analyzes power quality information collected from the first CT (Current Transformer) installed on the busbar, and adjusts reactive power based on the analysis results.

And the first reactive power adjustment device calculates the required reactive power based on the power quality of the busbar measured through the first CT, and adjusts the reactive power so that the power factor on the supply side is improved based on the point where the first CT is installed. It can be adjusted.

In addition, the first reactive power adjustment device determines the standard information used when calculating reactive power depending on whether the reserve voltage is reduced, and when the reserve voltage is not reduced, the reactive power can be calculated based on the power quality of the busbar. .

In order to adjust the reactive power, the first reactive power adjustment device may sequentially perform a reactive power calculation task and a control signal calculation task of calculating a control signal based on the reactive power calculation result.

Additionally, the first reactive power adjustment device may convert the voltage and current of the three-phase power supply into d-q coordinates when performing a reactive power calculation task.

And when the first reactive power adjustment device performs a control signal calculation, it can convert the On/Off information of the switching element into a control signal of space vector modulation (SVPWM, Space Vector Pulse Width Modulation).

In addition, the first reactive power adjustment device determines the standard information used when calculating reactive power depending on whether the reserve voltage is reduced, and when the reserve voltage is reduced, the power quality required by the bus bar and multiple loads according to voltage fluctuations is determined. Reactive power can be calculated based on the information.

And, according to an embodiment of the present invention, the reactive power adjustment system in connection with conservation voltage reduction is connected to a specific load among a plurality of loads through an expanded own ship in parallel in the bus bar, and collects data from the second CT installed on the own ship. It may further include a second reactive power adjustment device that receives and analyzes the power quality information of the own ship and adjusts the reactive power of the own ship based on the analysis results.

Additionally, when the first reactive power adjustment device and the second reactive power adjustment device operate together, they can perform a reactive power calculation task including whether to distribute reactive power between them.

Meanwhile, according to another embodiment of the present invention, a reactive power adjustment device linked to conservation voltage reduction includes a receiving unit that receives power quality information collected from a CT (Current Transformer) installed in a busbar; and a control unit that receives and analyzes the received power and adjusts the reactive power based on the analysis results.

And according to another embodiment of the present invention, a reactive power adjustment method in connection with conservation voltage reduction includes the steps of a reactive power adjustment device receiving power quality information collected from a CT (Current Transformer) installed on a busbar; Analyzing, by a reactive power adjustment device, received power quality information; and a step of the reactive power adjustment device adjusting the reactive power based on the analysis results.

In addition, according to another embodiment of the present invention, a reactive power adjustment system in conjunction with conservation voltage reduction includes a plurality of loads connected to a busbar; A first reactive power adjustment device that receives and analyzes power quality information collected from the first CT (Current Transformer) installed on the bus, and adjusts reactive power based on the analysis results; It is connected to a specific load among the plurality of loads through the own ship expanded in parallel from the busbar, receives and analyzes the power quality information of the own ship collected from the second CT installed on the own ship, and invalidates the own ship based on the analysis results. It includes; a second reactive power adjustment device that adjusts power.

As described above, according to the embodiments of the present invention, it is possible to not only adjust reactive power using only the power quality information collected from the CT (Current Transformer), but also analyze information from the upper energy management system (conservation voltage reduction operation system). there is.

In addition, according to embodiments of the present invention, by providing a distributed system configuration rather than a centralized system, capacity can be expanded in the form of modules.

1 is a diagram provided to explain a reactive power adjustment system according to an embodiment of the present invention;
Figure 2 is a diagram provided to explain the configuration of a reactive power adjustment device according to an embodiment of the present invention;
Figure 3 is a diagram provided in the description of the reactive power adjustment method according to an embodiment of the present invention, and
Figure 4 is a diagram provided to explain a reactive power adjustment system according to another embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

1 is a diagram provided to explain a reactive power adjustment system according to an embodiment of the present invention.

Referring to FIG. 1, the reactive power adjustment system receives and analyzes power quality information collected from a plurality of loads (load 1 to load N) connected to the busbar and the CT (11) installed on the busbar, and analyzes the power quality information based on the analysis results. It may include a reactive power adjustment device 100 that adjusts reactive power.

In addition, the reactive power adjustment device 100 can receive and analyze power quality information from the upper energy management system 20.

In other words, the reactive power adjustment device 100 collects from the CT 11 to adjust the corresponding reactive power in real time when implementing a system capable of operating load facilities at the optimal efficiency voltage for the purpose of improving the energy efficiency of industrial companies. In addition to adjusting reactive power using only available power quality information, it is possible to analyze information on whether the conservation voltage of the upper energy management system is reduced.

In addition, the reactive power adjustment device 100 reduces industrial electricity bills by improving the power factor through reactive power adjustment, reduces power loss in the customer premises system, increases facility capacity margin, reduces voltage drop, and efficiently operates load devices. We can support you to make it possible.

Through this, power companies can minimize the impact of consumer loads, enabling stable operation of the entire distribution system.

Figure 2 is a diagram provided to explain the configuration of a reactive power adjustment device according to an embodiment of the present invention.

Referring to FIG. 2, the reactive power adjustment device may include a receiving unit 110, a control unit 120, and a storage unit 130.

The receiving unit 110 may receive power quality information collected from the CT 11 installed on the busbar.

Additionally, the receiver 110 can also receive power quality information from the energy management system 20.

The storage unit 130 is a storage medium that stores programs and data necessary for the operation of the control unit 120.

For example, the storage unit 130 may store power quality information collected from the CT 11 and the energy management system 20 collected through the receiver 110, respectively.

The control unit 120 can analyze power quality information and process all matters for adjusting reactive power based on the analysis results.

For example, the control unit 120 calculates the required reactive power based on the power quality of the busbar measured through the CT 11, and adjusts the reactive power based on the calculation result to determine the point where the CT 11 is installed. Based on this, the power factor on the supply side can be improved.

In general, when operating at a lower voltage for the purpose of improving industrial energy efficiency, the required reactive power is different depending on the operation characteristics of the facility (load). If all of the reactive power that increases at a specific load is supplied from the supply side, the total Loss may occur in the line (busbar), and loss may also occur in the process of voltage adjustment due to changing reactive power.

Accordingly, the control unit 120 adjusts the reactive power using information on whether the conservation voltage of the energy management system, which is a higher level system, has decreased, thereby adjusting the voltage of the amount of reactive power required by the load and supplying it close to the load. It can be made possible.

That is, the control unit 120 may determine the reference information used when calculating reactive power depending on whether the storage voltage is reduced and calculate the reactive power using the determined reference information as a reference.

Specifically, for example, the control unit 120 determines the standard information used when calculating reactive power depending on whether the reserve voltage is reduced, and when the reserve voltage is not reduced, calculates the reactive power based on the power quality of the busbar. You can.

At this time, when performing a reactive power calculation task, the control unit 120 may convert the voltage and current of the three-phase power supply into d-q coordinates.

Conversely, when reducing the conservation voltage, the control unit 120 may calculate reactive power based on power quality information required by the bus bar and a plurality of loads (Load 1 to Load N) according to voltage fluctuations.

In addition, when the reactive power is calculated, the control unit 120 calculates a control signal to improve the power factor on the supply side based on the point where the CT 11 is installed based on the reactive power calculation result, and sends the calculated control signal. Reactive power can be adjusted by transmitting it.

Specifically, when performing a control signal calculation task, the control unit 120 can convert the On/Off information of the switching element into a control signal of a space vector modulation method (SVPWM, Space VeCT(11) or Pulse Width Modulation). there is.

Meanwhile, if power quality information of the load can be obtained from the energy management system 20, the control unit 120 can calculate the required reactive power based on this, and can calculate the number of CTs installed in duplicate to measure power quality. It can be reduced.

Figure 3 is a diagram provided to explain a method for adjusting reactive power according to an embodiment of the present invention. The reactive power adjustment method according to this embodiment can be implemented by the reactive power adjustment system described above with reference to FIGS. 1 and 2.

Referring to FIG. 3, this reactive power adjustment method uses a reactive power adjustment device to determine the standard information used when calculating reactive power depending on whether the reserve voltage is reduced, and when the reserve voltage is not reduced, the power quality of the busbar is determined. When reactive power is calculated based on and conservation voltage reduction is performed, reactive power can be calculated based on the power quality information required by the bus bar and multiple loads (Load 1 to Load N) according to voltage fluctuations ( S310).

In the reactive power adjustment method, when the reactive power is calculated, a control signal is calculated to improve the power factor on the supply side based on the point where the CT (11) is installed based on the reactive power calculation result (S320), and the calculated control signal is calculated. By transmitting, reactive power with improved power factor can be output (supplied) (S330).

Figure 4 is a diagram provided to explain a reactive power adjustment system according to another embodiment of the present invention.

The reactive power adjustment system provides a distributed system configuration rather than a centralized system, so when expanded according to required capacity, it may be possible to expand in parallel form at the existing installation point.

Referring to FIG. 4, the reactive power adjustment system according to this embodiment can be configured with two or more reactive power adjustment devices to form a distributed system rather than a centralized system.

Specifically, the reactive power adjustment system according to this embodiment receives and analyzes power quality information collected from a plurality of loads (load 1 to load N) connected to the busbar and the first CT (11) installed on the busbar, and , a first reactive power adjustment device (100-1) that adjusts reactive power based on the analysis results, and a specific load (load 2 in FIG. 2) among a plurality of loads (load 1 to load N) and expansion in parallel on the busbar. A second reactive power adjustment device is connected through the own ship, receives and analyzes the power quality information of the own ship collected from the second CT (12) installed on the own ship, and adjusts the reactive power of the own ship based on the analysis results. It can be included.

The first reactive power adjustment device may be provided with the configuration described above with reference to FIG. 2.

The second reactive power adjustment device is provided with the same configuration as the first reactive power adjustment device, but can analyze the own ship's power quality information instead of the bus power quality information and adjust the own ship's reactive power based on this.

The first reactive power adjustment device and the second reactive power adjustment device can be data linked, enabling cooperative control of reactive power, and when operating together, they can perform reactive power calculation work, including whether or not to distribute reactive power between them. You can.

That is, when the first reactive power adjustment device and the second reactive power adjustment device are operated based only on the power quality information of a single point, reactive power with an improved power factor is supplied from a place far away from the load according to the conditions of the load. Loss may occur, but in the case of cooperative control, only the second reactive power adjustment device (100-2) close to the own ship's load (load 2 in Figure 2) operates to supply reactive power with an improved power factor to the own ship. Losses can be reduced.

In summary, the reactive power adjustment system includes, in addition to the first reactive power adjustment device connected to the first CT (11) installed on the busbar, a second reactive power adjustment device connected to the second CT (12) installed on the own ship expanded in parallel from the busbar. When a device is added, in order to supply reactive power with improved power factor to the own ship's load (load 2 in Figure 2), a second reactive power source close to the own ship's load (load 2 in Figure 2) is connected through data linkage. Only the regulating device 100-2 operates, thereby supplying reactive power with an improved power factor to the own vessel, thereby minimizing power loss.

In the above, preferred embodiments of the present invention have been shown and described, but the present invention is not limited to the specific embodiments described above, and may be used in the technical field to which the invention pertains without departing from the gist of the present invention as claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be understood individually from the technical idea or perspective of the present invention.

11: 1st CT (Current Transformer)
12: 2nd CT (Current Transformer)
20: Energy management system
100: Reactive power adjustment device
110: receiving unit
120: control unit
130: storage unit

Claims (12)

Multiple loads connected to a mothership; and
A first reactive power adjustment device that receives and analyzes power quality information collected from the first CT (Current Transformer) installed on the bus, and adjusts reactive power based on the analysis results; reactive power adjustment in connection with conservation voltage reduction, including; system.
In claim 1,
The first reactive power adjustment device is,
Conservation voltage reduction characterized by calculating the required reactive power based on the power quality of the busbar measured through the first CT and adjusting the reactive power so that the power factor on the supply side is improved based on the point where the first CT is installed. Reactive power adjustment system linked with.
In claim 2,
The first reactive power adjustment device is,
Reactive power linked to conservation voltage reduction, characterized in that the standard information used when calculating reactive power is determined depending on whether conservation voltage is reduced, and when conservation voltage reduction is not performed, reactive power is calculated based on the power quality of the busbar. Coordination system.
In claim 3,
The first reactive power adjustment device is,
In order to adjust reactive power, a reactive power adjustment system linked to conservation voltage reduction, characterized in that sequentially performing a reactive power calculation operation and a control signal calculation operation that calculates a control signal based on the reactive power calculation result.
In claim 4,
The first reactive power adjustment device is,
When performing a reactive power calculation task, a reactive power adjustment system linked to conservation voltage reduction, characterized in that the voltage and current of the three-phase power supply is converted to dq coordinates.
In claim 5,
The first reactive power adjustment device is,
When performing control signal calculation work, a reactive power adjustment system linked to conservation voltage reduction, characterized by converting the On/Off information of the switching element into a control signal of the space vector modulation method (SVPWM, Space Vector Pulse Width Modulation).
In claim 2,
The first reactive power adjustment device is,
The standard information used when calculating reactive power is determined depending on whether the reserve voltage is reduced. When the reserve voltage is reduced, the reactive power is calculated based on the power quality information required by the bus bar and multiple loads according to voltage fluctuations. A reactive power adjustment system linked to conservation voltage reduction, characterized by:
In claim 1,
It is connected to a specific load among multiple loads through an expanded own ship in parallel from the busbar, receives and analyzes the power quality information of the own ship collected from the second CT installed on the own ship, and calculates the reactive power of the own ship based on the analysis results. A reactive power adjustment system linked to conservation voltage reduction, further comprising a second reactive power adjustment device that adjusts.
In claim 8,
The first reactive power adjustment device and the second reactive power adjustment device are:
When operating together, a reactive power adjustment system linked to conservation voltage reduction, characterized in that it performs a reactive power calculation task including whether or not to distribute reactive power between each other.
A receiving unit that receives power quality information collected from a CT (Current Transformer) installed on the bus; and
A reactive power adjustment device linked to conservation voltage reduction that includes a control unit that receives and analyzes the received power and adjusts the reactive power based on the analysis results.
A reactive power adjustment device receiving power quality information collected from a CT (Current Transformer) installed on the busbar;
Analyzing, by a reactive power adjustment device, received power quality information; and
A reactive power adjustment method in conjunction with conservation voltage reduction, comprising the step of the reactive power adjustment device adjusting the reactive power based on the analysis results.
Multiple loads connected to a mothership;
A first reactive power adjustment device that receives and analyzes power quality information collected from the first CT (Current Transformer) installed on the bus, and adjusts reactive power based on the analysis results; and
It is connected to a specific load among multiple loads through an expanded own ship in parallel from the busbar, receives and analyzes the power quality information of the own ship collected from the second CT installed on the own ship, and calculates the reactive power of the own ship based on the analysis results. A second reactive power adjustment device that adjusts; a reactive power adjustment system linked to conservation voltage reduction.