CN214674361U

CN214674361U - Dynamic voltage regulation compensation circuit

Info

Publication number: CN214674361U
Application number: CN202022478557.XU
Authority: CN
Inventors: 李晓明
Original assignee: Guangxi Luogui Energy Conservation And Environmental Protection Research Institute Co ltd
Current assignee: Guangxi Luogui Energy Conservation And Environmental Protection Research Institute Co ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-11-09
Anticipated expiration: 2030-10-30

Abstract

The utility model relates to a dynamic pressure regulating compensating circuit, including controller (406) and regulating transformer (401), voltage tap (402), power electronic switch (403), data acquisition unit (404) and prevent short circuit protection circuit (405) that are connected with the controller simultaneously. Compared with the prior art, the utility model discloses it is high, the loss is little to have alternating current power supply reliability, and dynamic voltage regulation scope is wide, and oil engine electricity generation utilization rate is high, and electric energy utilization rate is high, and the fault rate is low, the load characteristic influences little superiority to the safe operation.

Description

Dynamic voltage regulation compensation circuit

Technical Field

The utility model relates to an energy-concerving and environment-protective field of power supply and consumption system, in particular to dynamic voltage regulation compensating circuit.

Background

The reliability of power supply equipment of a communication base station (iron tower) directly influences the communication service quality, and is related to the data transmission of a wide area network, remote voice and video communication, accident rescue, disaster prevention and resistance and other works, vast mountainous rural areas, multiple and wide iron tower sites, severe construction and maintenance environment and huge workload. Due to the phenomena of power failure of a power grid, lightning strike failure of a transformer special for the iron tower, high loss of a storage battery of a base station, difficult power generation and the like, the power supply reliability of the base station is low, the operation quality cannot meet the customer requirements, and the iron tower company urgently needs to improve the power supply quality of the base station so as to fundamentally solve three problems which puzzle the operation of telecommunication enterprises for a long time.

Frequent influence of power failure on customer service index

The total network power failure frequency of a certain city in the mountain area in 2018 is 158036 times, and according to data provided by a power grid company, 40% of the large network fault power failure reasons are caused by line faults of special transformers for iron towers, so that the iron tower base stations are out of service in batches, and the deterioration of operation indexes is further aggravated.

The failure rate and maintenance cost of the special transformer are high

Due to the reasons of insufficient coverage of most rural power grids, low transformer capacity and the like, special transformers are mostly used for supplying power to the base station during building the station, but a plurality of adverse factors such as high failure rate, high operation cost and the like are brought. In 2018, the total number of fault maintenance of the special transformer in a certain city is 4929.

(III) the difficulty in power generation guarantee is a main factor influencing indexes

After the power grid has a power failure, an iron tower company can ensure the normal operation of an operator base station through oil engine power generation, mountainous areas have more stations and high power generation difficulty, and the power generation demand satisfaction rate of customers is always in a lower level.

In the face of rapid development of mobile internet and arrival of the 5G era, large-flow data demand and mobile data flow are increased explosively, a large number of 5G macro stations and micro stations need to be built, about 600 ten thousand communication base stations are needed for national 5G network coverage in nearly 6-7 years, and meanwhile, energy-saving, environment-friendly, high-reliability and intelligent efficient power supply equipment for the communication base stations is urgently needed for the existing 3G/4G base stations and newly-built 5G base stations.

Disclosure of Invention

The utility model provides a developments pressure regulating compensation arrangement, its principle is the comprehensive technologies such as adoption developments pressure regulating compensation technique, and the voltage quality that effectively solves the different degrees of rural communication basic station ubiquitous in mountain area is unqualified, load unbalanced three phase, electric wire netting special transformer fault rate is high, the basic station lacks looks fault rate height, when the electric wire netting has a power failure oil machine electricity generation utilization ratio is low, three-phase air conditioner can not normal use scheduling problem.

The purpose of the utility model is realized like this:

the dynamic voltage regulation compensation device is characterized by comprising a controller, a voltage regulating transformer, a voltage tap, a power electronic switch, a data acquisition unit and a short-circuit prevention protection circuit, wherein the voltage regulating transformer, the voltage tap, the power electronic switch and the data acquisition unit are simultaneously connected with the controller.

In the above dynamic voltage regulation compensation apparatus, the voltage taps are drawn out from the primary and secondary windings of the regulating transformer according to the voltage regulation level N and the voltage regulation level difference Δ U required by the application.

In the dynamic voltage regulation compensation device, the power electronic switch is formed by combining power electronic devices with short circuit type conduction characteristics; the voltage tap of the regulating transformer and the current-limiting resistor for preventing the winding from short circuit are respectively connected, and the current-limiting resistor is connected with the voltage-regulating output end of the dynamic voltage-regulating device; the controller controls the trigger circuit to send out trigger pulses according to the requirements of application functions, so that the on-off of the power electronic switch is controlled, and the dynamic voltage regulating function is realized.

In the above dynamic voltage regulation compensation apparatus, the data acquisition unit is characterized in that: the device comprises an analog/digital conversion circuit, a sampling holding circuit, a data memory and a sampling controller, wherein the sampling speed and the sampling precision are designed according to the conditions meeting the requirements of application functions.

In the above dynamic voltage regulation compensation apparatus, the short-circuit prevention protection circuit is characterized in that: including power electronic switches, current limiting resistors, and mechanical switches. The power electronic switch and the current-limiting resistor for preventing the winding from short circuit are connected in series to form a series branch circuit, so that short-circuit accidents in the conversion process of the two voltage-regulating branch circuits are prevented. The series branch is connected with the mechanical switch in parallel to form a voltage regulating branch. The series branch is used for switching on and switching off the voltage regulating branch in the dynamic voltage regulating process; the parallel branch is used for short-circuiting the series branch after the voltage regulating branch is connected, so that the power electronic switch does not operate in a long-term electrified mode, and the power loss of the power electronic switch is reduced.

In the above dynamic voltage regulation compensation apparatus, the controller is characterized in that: the controller adopts a high-performance and high-reliability embedded system, has strong functions of data processing, scientific calculation, data communication, data storage and the like, and the model selection of the embedded system is designed according to the condition meeting the requirement of the application function.

To sum up, compare with prior art, the utility model discloses it is high, the loss is little to have alternating current power supply reliability, and dynamic voltage regulating range is wide, and oil engine electricity generation utilization rate is high, and electric energy utilization rate is high, and the fault rate is low, the load characteristic influences little superiority to the safe operation.

Drawings

Fig. 1 is a schematic diagram of a dynamic voltage regulation compensation device according to an embodiment of the present invention.

Fig. 2 is a circuit diagram of a dynamic voltage regulation compensation device according to an embodiment of the present invention.

Detailed Description

The following detailed description is made with reference to the accompanying drawings and examples:

dynamic voltage-regulating compensation device

1. General of

As shown in fig. 1, the apparatus includes a voltage regulating transformer 401, a voltage tap 402, a power electronic switch 403, a data acquisition unit 404, a data communication unit 407, a short-circuit protection circuit 405, and a controller 406.

The regulating transformer 401 is characterized in that:

A. single-phase, the double transformation ratio of primary side, the multiple transformation ratio of secondary side, wide voltage regulation scope, both can step down, can step up again, multistage dynamic voltage regulation. The primary side double transformation ratio is a normal operation transformation ratio of 1:1, and the abnormal operation transformation ratio is 0.5: 1. The voltage regulating range is not less than 50% of the secondary side rated voltage.

B. Under the normal operation condition of the regulating transformer, the transformation ratio is 1:1, and the regulating transformer is used as a step-down multistage dynamic regulating transformer; the regulating transformer is connected the single-phase output voltage that three-phase turned into single-phase transformer, under the unusual operational aspect, promptly: when three phases lack one phase, the transformation ratio is 0.5:1, and the transformer is used as a boosting multistage dynamic regulating transformer.

C. The voltage regulating level N and the voltage regulating level difference delta U of the voltage regulating transformer are determined according to the principle that when the highest voltage and the lowest voltage appear at the input end of the voltage regulating transformer, the output voltage of the voltage regulating transformer meets the national standard requirement of voltage quality in an application scene.

The voltage tap 402 is characterized by: and drawing corresponding taps from the primary winding and the secondary winding of the regulating transformer according to the regulating stage number N and the regulating stage difference delta U required by the application.

The power electronic switch 403 is characterized in that: the short circuit type conduction characteristic power electronic device is combined; the voltage tap of the regulating transformer and the current-limiting resistor for preventing the winding from short circuit are respectively connected, and the current-limiting resistor is connected with the voltage-regulating output end of the dynamic voltage-regulating device; the controller controls the trigger circuit to send out trigger pulses according to the requirements of application functions, so that the on-off of the power electronic switch is controlled, and the dynamic voltage regulating function is realized.

The data acquisition unit 404 is characterized in that: the circuit comprises a 16-channel 16-bit analog/digital conversion circuit, a sample hold circuit, a 4G large-capacity data storage DRAM and a high-performance CPU sample controller. The sampling speed is designed according to the conditions meeting the requirements of the application functions.

The short-circuit protection circuit 405 is characterized in that: including power electronic switches 403, current limiting resistors, and mechanical switches. The power electronic switch 403 is connected in series with a current limiting resistor for preventing the winding from short circuit to form a series branch, so as to prevent short circuit accidents in the conversion process of the two voltage regulating branches. The series branch is connected with the mechanical switch in parallel to form a voltage regulating branch. The series branch is used for switching on and switching off the voltage regulating branch in the dynamic voltage regulating process; the parallel branch is used for short-circuiting the series branch after the voltage regulating branch is connected, so that the power electronic switch does not operate in a long-term electrified mode, and the power loss of the power electronic switch is reduced.

The controller 406 is characterized by: the controller adopts a high-performance and high-reliability embedded system, has strong functions of data processing, scientific calculation, data communication, data storage and the like, and the model selection of the embedded system is designed according to the condition meeting the requirement of the application function. The controller 406 performs real-time control on the data acquisition unit 404, the data communication unit (407), the power electronic switch 403, the short-circuit protection circuit 405, the voltage regulating transformer (401), and the voltage tap 402 according to application requirements.

The data communication unit 407 is characterized by: and the local area network or the 4G/5G wireless communication network is adopted for remote data transmission and data communication.

Fig. 2 is a schematic diagram of a wiring diagram of an embodiment of the dynamic voltage regulation compensation device, wherein:

DVRT is a double winding bi-directional regulating transformer with transformation ratios of 1:1 and 0.5: 1. The voltage of the input end I1-I2 of the primary winding of the regulating transformer is 460V (output voltage of a special transformer and output voltage of a 400V public transformer) and 230V (single-phase voltage of oil engine power generation). Output voltage end O1-I3 of the dynamic voltage regulation compensation device: and the voltage regulating end outputs 230V to supply single-phase load. Output voltage end O2-I3 of the dynamic voltage regulation compensation device: and a split-phase voltage end outputs 400V, and is connected to a split-phase circuit to supply power to a three-phase load.

PT and CT are voltage transformer and current transformer, which can detect the input and output voltage and current of voltage-regulating transformer.

TH is a thyristor power electronic switch which is connected in parallel positively and negatively and is used for controlling a voltage tap of the voltage regulating transformer. And R is a current-limiting resistor and is used for preventing the short circuit or the open circuit of the transformer winding in the dynamic voltage regulation process.

KM is a contactor and is used for reducing power loss of the power electronic switch in a conducting operation state.

And C is a capacitor for reactive compensation.

DL is a circuit breaker for switching on and off the power supply.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The invention is not limited to the embodiments described herein, but is capable of other embodiments according to the invention, and may be used in various other applications, including, but not limited to, industrial, or industrial. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention all still fall within the protection scope of the technical solution of the present invention, where the technical entity does not depart from the content of the technical solution of the present invention.

Claims

1. A dynamic voltage regulation compensation circuit is characterized by comprising a controller (406), a voltage regulating transformer (401), a voltage tap (402), a power electronic switch (403), a data acquisition unit (404) and a short-circuit prevention protection circuit (405), wherein the voltage regulating transformer, the voltage tap, the power electronic switch and the data acquisition unit are simultaneously connected with the controller;

the voltage tap (402) draws corresponding taps from primary and secondary windings of the regulating transformer according to the regulating stage number N and the regulating stage difference delta U required by application;

the power electronic switch (403) is formed by combining short-circuit type conduction characteristic power electronic devices; the voltage tap of the regulating transformer and the current-limiting resistor for preventing the winding from short circuit are respectively connected, and the current-limiting resistor is connected with the voltage-regulating output end of the dynamic voltage-regulating device; the controller controls the trigger circuit to send out trigger pulses according to the requirements of application functions, so that the on-off of the power electronic switch is controlled, and the dynamic voltage regulation function is realized;

the data acquisition unit (404) comprises a 16-channel 16-bit analog/digital conversion circuit, a sample hold circuit, a 4G large-capacity data storage DRAM and a high-performance CPU sampling controller;

the short-circuit prevention protection circuit (405) comprises a power electronic switch (403), a current-limiting resistor and a mechanical switch, wherein the power electronic switch (403) is connected with the current-limiting resistor for preventing the winding from being short-circuited in series to form a series branch, so that a short-circuit accident in the conversion process of two voltage regulation branches is prevented, the series branch is connected with the mechanical switch in parallel to form a voltage regulation branch, and the series branch is used for switching on and off the voltage regulation branch in the dynamic voltage regulation process; the parallel branch is used for short-circuiting the series branch after the voltage regulating branch is connected, so that the power electronic switch does not operate in a long-term electrified mode, and the power loss of the power electronic switch is reduced; the controller (406) is an embedded system.