CN111098748A

CN111098748A - Automatic voltage stabilization charging pile based on pre-balancing system

Info

Publication number: CN111098748A
Application number: CN202010038536.8A
Authority: CN
Inventors: 张翼洲
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-01-14
Filing date: 2020-01-14
Publication date: 2020-05-05

Abstract

The invention relates to the technical field of electric automobile charging devices. The utility model discloses an automatic voltage stabilization fills electric pile based on balanced system in advance which characterized in that fills electric pile's structure for three-in two-out formula, two phase lines and a N line of three-phase AC power are connected to the input, and phase line and N line of electric automobile single-phase line are connected to the output, balanced system's automatic voltage stabilization fills electric pile in advance, contain three routes sampling module, intelligent control module, drive module, dual supply module, thing networking module. According to the invention, tracking adjustment is carried out through system analysis according to the random change of the parking and charging of the charging automobile, a charging power supply is switched, a charging circuit with a current sampling value smaller than a preset value is adjusted to be on the best phase power supply to wait for charging, and automobile charging data is sent to a cloud database for storage through an Internet of things module.

Description

Automatic voltage stabilization charging pile based on pre-balancing system

Technical Field

The invention relates to the technical field of electric automobile charging devices.

Background

With the overall improvement of the living standard of people in China, various new energy vehicles emerge endlessly, and particularly, electric vehicles using electric energy can comprehensively replace the traditional energy vehicles for sale in 2025 years, but a series of problems are caused by the popularization and application of a large number of rechargeable vehicles.

1. The single-phase power supply voltage of a residential site (including a charged car parking lot) is unstable. Electric automobile need use to fill electric pile just can charge, for satisfying daily life requirement, it needs to install in residential quarter parking area to fill electric pile, use same transformer with the residential quarter building, and resident user's air conditioner in the district, the water heater, the continuous access of high-power consumer such as motor, just make the serious unbalance loading of low voltage power supply system's three-phase load, local overload phenomenon takes place occasionally, high-power electric automobile's intervention must make originally unstable low voltage circuit system snow frost, make three-phase line voltage more and more asymmetric, this power supply capacity and the power supply quality that not only influences power supply system, the electric power system accident and the trouble that have more increased from this to cause.

2. The charging power supply voltage of the special charging automobile parking lot is unstable. According to using the relevant personnel in overcharge parking area to learn, fill the transformer that electric pile used and have the phenomenon of exerting oneself inadequately, appear abnormal voltage information such as overvoltage, undervoltage, appear intermittent type nature outage (excessive pressure, undervoltage protection) when leading to the car to charge for the charge time overlength fills electric pile and takes place tripping operation power-off protection when voltage is excessive unusual even, needs the manual switch-on. Theoretically, the load is large when the electric automobile is charged, and if a user stops at will, all the automobiles may be stopped on one phase of electricity to be charged, so that large load imbalance is brought to the transformer, and over-voltage and under-voltage faults are caused. If people are persuaded, the load unbalance can be relieved by manpower, but the expenditure is increased unintentionally, and if the drivers are not matched, the drivers have vacant positions to stop, and the drivers are required to go to fixed positions, so that disputes are easy to occur.

3. In 14 days 10 and 2019, in the requirements of 'ubiquitous power internet of things white paper' proposed by the national power grid, the power utilization equipment is required to be capable of counting and collating the power utilization data of the user when in work, and potential consumption information of the user is mined according to the power utilization data. At present, the function is in the basic construction stage, and a plurality of defects are needed to be perfected in recent years.

Disclosure of Invention

In view of the above, the present invention provides an automatic voltage stabilization charging pile based on a pre-balancing system, which comprises:

1. the phenomena of unstable single-phase power supply voltage of residential places (containing the charging automobile parking lot) and unstable charging power supply voltage of the special charging automobile parking lot are obviously improved. The specific mode is as follows: when detecting whether the load of the single-phase low-voltage line is lower than a preset value before charging the charging pile, if the load of the single-phase low-voltage line is lower than the preset value, connecting a charging loop to the most appropriate one-phase power supply in the three-phase power supply, and then connecting the power supply of the electric automobile to a specified power supply when the automobile is charged. When the automobile starts to charge, the charging pile only detects various charging information, and the action of switching phase electricity does not occur any more. If the load is higher than the preset value, the original state is kept unchanged, and the load of the line is detected in a circulating mode. When the automobile is charged successively, the load tends to change irregularly and dynamically, tracking adjustment is carried out in real time according to the change of the load through analysis of the intelligent detection module, the user line with the load sampling value smaller than the preset value is adjusted to be in the best phase power supply to wait for power utilization, the more the automobile is charged, the more balanced the three-phase load is, and the more symmetrical the three-phase power supply is. Fill electric pile and be equipped with two sense terminals, a single-pole double-throw magnetism and keep the commutation switch, through the detection to two-phase circuit, judge which looks load is more unbalanced to carry out the commutation, do not need the three-phase to judge and also can accomplish load balance. If extreme conditions occur, at most one third of the charging loops are switched to one-phase power supply, so that the impact on the power grid is avoided.

2. When the charging pile detection device works at a state that the current sampling value of a single-phase line of a user is lower than a preset value, the intelligent control module transmits power sampling information to the cloud end through the Internet of things module. When the charging pile detection device works at a state that the current sampling value of a single-phase line of a user is higher than a preset value, the intelligent control module transmits battery information sampling information to the cloud end through the Internet of things module. The method is used for collecting automobile charging data and battery charging information and providing useful data for construction of ubiquitous power Internet of things.

3. The detection of one charging pile before charging is called pre-detection, the detection of all charging piles before charging is called pre-detection system, each charging pile can generate specific behavior action (phase change) through the pre-detection system, because the intervention of the charging automobiles is sequential, if the three-phase power supply is asymmetric due to the automobile which is accessed firstly, then after passing through the pre-detection system, the automobile which is accessed backwards is connected on a proper power supply, so that the three-phase power supply develops towards absolute symmetry, the original unstable system tends to be stable, if the charging automobiles are regarded as line loads, then the system is a load balancing system, and all behaviors occur before each charging pile is charged, and the system is called pre-balancing system.

The invention adopts the following technical scheme that:

the automatic voltage-stabilizing charging pile based on the pre-balancing system is composed of a three-way sampling module, an intelligent control module, a driving module, a dual-power module and an Internet of things module.

The three-way sampling module comprises phase voltage detection and load current detection and is used for detecting a two-phase power supply of a low-voltage line and detecting the current of a phase line of a single-phase charging circuit of the automobile; the power supply detection input end is connected in parallel to two phase line loops of a three-phase alternating current circuit of the low-voltage circuit, and the output end is connected with the intelligent control module; the current detection input end is connected to the automobile single-phase charging loop in parallel, and the module output end is connected with the intelligent control module;

the intelligent control module takes a single chip microcomputer as a processor to analyze a phase voltage sampling signal and a charging current sampling signal according to a specific judgment program and send a trigger signal to a driving module, and the module is connected in series between three sampling modules and the driving module;

the driving module takes a motor driver type phase change switch or a single-pole double-throw magnetic latching phase change switch as a driving device, input interfaces of two driving modes are connected to two phase lines of a low-voltage circuit, an output interface is connected to a phase line of an automobile charging single-phase loop, and the whole driving module is connected between a low-voltage two-phase power supply and the charging single-phase loop in series; the control circuit of the driving module is connected with the signal trigger pin of the single chip microcomputer;

the dual-power module adopts a single-phase current source module and a single-phase voltage source module to supply power to the intelligent control module, the input end of the current source module is connected with a single-phase low-voltage circuit, the output end of the current source module is connected with a power pin of the single-chip microcomputer, the input end of the voltage source module is connected with the single-phase low-voltage circuit, and the output end of the.

The Internet of things module takes an Internet of things communication chip as a core, a sampling signal acquired by the intelligent control module is transmitted to the cloud end through the Internet of things module, one end of the module is connected to a pin appointed by the single chip microcomputer, and one end of the module is connected to the transmitting antenna.

Automatic steady voltage fills electric pile's job characteristics based on balanced system in advance, its characterized in that:

when the charging pile detection device works when the current sampling value of the single-phase line of the user is lower than a preset value, the intelligent control module completes the switching of line phase change according to the program setting;

when the charging pile detection device works when the current sampling value of the user single-phase line is higher than a preset value, the charging pile driving module is in a silent state, the current sampling is detected, and the three-phase power supply is stopped being switched;

automatic steady voltage fills electric pile's thing networking module work characteristics based on balanced system in advance, its characterized in that:

when the charging pile detection device works at a state that the current sampling value of a single-phase line of a user is lower than a preset value, the intelligent control module transmits power sampling information to the cloud end through the Internet of things module.

When the charging pile detection device works at a state that the current sampling value of a single-phase line of a user is higher than a preset value, the intelligent control module transmits battery information sampling information to the cloud end through the Internet of things module.

The technical effects of the invention are as follows:

1. and (3) stability is improved: the phenomenon of unstable voltage caused by the use of charging piles in the distribution area is actively adjusted.

2. The charging quality is improved: after this electric pile that fills of installation, can accomplish the commutation operation before the car charges, can not charge to the car and cause the influence, guarantee the quality of charging.

3. Manpower is saved: fill electric pile and can change the looks automatically according to the real-time change of load, need not go to look for corresponding position through the manual work.

4. The safety is improved: by adopting two-phase detection and two-phase control, the requirement that the three-phase load approaches to balance can be theoretically met, and the risk that the three-phase is changed into one phase is avoided.

5. The reliability is improved: and the output end of the charging pile is connected with the inlet wire of the charging loop, and a current sensor is installed and used as a feedback control signal to be input. The current state of the switch is fed back, and after each phase change switch action, the current feedback end feeds back a signal to the control device to prevent power source error change.

6. Building an Internet of things data information platform: after the installation fills electric pile, can be in real time with car charging data information transmission to high in the clouds database storage, establish independent, safe, daily power consumption database for the user, establish the basis for the construction of ubiquitous electric power thing networking ecological garden.

This fill electric pile and ordinary electric pile size without the difference, simple to operate, simple structure, safe and reliable only need fix the installation of parking department, can receive obvious effect.

Drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a flow chart of the working principle of the present invention.

Fig. 3 is a schematic diagram of technical features of the invention.

Fig. 4 is an expanded example of the present invention patent fig. 1.

Fig. 5 is an expanded example of the present invention patent fig. 2.

Fig. 6 is an expanded example of the present invention patent fig. 3.

Fig. 7 is an expanded example of the present invention patent fig. 4.

Fig. 8 is an expanded example of the present invention patent fig. 5.

Fig. 9 is an expanded example of the present invention patent fig. 6.

Fig. 10 is an expanded example of the present invention patent fig. 7.

Detailed Description

The invention is described in detail with reference to the accompanying drawings and the detailed description.

As shown in fig. 1, the automatic voltage stabilization charging pile based on the pre-balancing system comprises a three-way sampling module, an intelligent control module, a driving module, a dual-power module and an internet of things module.

the driving module takes a motor driver type phase change switch or a single-pole double-throw magnetic latching phase change switch as a driving device, input interfaces of two driving modes are connected to two phase lines of a low-voltage circuit, an output interface is connected to a phase line of an automobile charging single-phase circuit, and the whole driving module is connected between a low-voltage two-phase power supply and the charging single-phase circuit in series; the control circuit of the driving module is connected with the signal trigger pin of the single chip microcomputer;

As described with reference to fig. 1 and 2: the working principle of the automatic voltage-stabilizing charging pile based on the pre-balancing system is as follows:

the three-way sampling module respectively samples two-phase power supplies in A, B, C three-phase power supplies, and if the two-phase power supplies are an A phase and a B phase, firstly, data such as voltage, current, power factor, phase and the like of A, B two phases are detected, and then, current detection is carried out on an output circuit at the output end of the charging pile; if the current detection is smaller than the preset value, A, B two-phase detection values are sent to an intelligent control module for analysis, a control signal is sent after the analysis, a phase change switch corresponding to a two-phase power supply is operated, a switch of a one-phase power supply with a lighter load is switched on, a switch of the one-phase power supply with a heavier load is switched off, if the A-phase load is heavier and the B-phase load is lighter, a switch of the B-phase power supply is switched on, a switch of the A-phase power supply is switched off, a user load circuit is connected into the B-phase power supply, and various detection signals are sent to the cloud end through an internet of; if the current sampling is larger than the preset value, the current sampling is carried out, the phase change switch maintains the original state, and the current signal is sent to the cloud end through the Internet of things module. The same applies to the case where the A phase and the C phase are sampled and the case where the B phase and the C phase are sampled.

As shown in fig. 3: on the basis of a technical characteristic schematic diagram of an automatic voltage-stabilizing charging pile of a pre-balancing system, a two-phase power supply is distributed to the charging pile equally as much as possible on A, B, C three-phase power supplies, so that an intelligent control module can uniformly control the phase change of the three-phase power supplies. It can be known from fig. 3 that two input ends of an automatic voltage stabilization charging pile based on pre-balancing system are connected with two phase lines of a low-voltage line respectively, and the output end is connected with the inlet end of a single-phase circuit of an automobile, and the technical characteristic is that the automatic voltage stabilization charging pile has three-inlet and two-outlet types, and the effect is that: three lines enter the charging pile as input ends, and two lines output the charging pile as output ends.

As shown in fig. 4: based on the expansion case figure 1 of the automatic voltage-stabilizing charging pile of the pre-balancing system, A, B, C three-phase power supplies are connected to a charging pile sampling module at the input end of a charging pile A, the three-phase sampling module is changed into a four-phase sampling module, the three-phase sampling module is distributed to an automobile single-phase charging loop through an intelligent control module, and other structures are consistent with those in figure 1. The charging post B, C is consistent with a.

As shown in fig. 5: based on the expansion case of the automatic voltage-stabilizing charging pile of the pre-balancing system, in figure 2, a double-power supply module is replaced by a single-power supply module for supplying power, and other structural diagrams are consistent with those in figure 1.

As shown in fig. 6: based on the expansion case of the automatic voltage-stabilizing charging pile of the pre-balancing system, in fig. 3, a double-power-supply module is replaced by a single-power-supply module for supplying power, and other structural diagrams are consistent with those in fig. 4.

As shown in fig. 7: based on the expansion case of the automatic voltage stabilization charging pile of the pre-balancing system, the internet of things module is removed from the dual-power charging pile, and other structures are consistent with those in the structure shown in fig. 1.

As shown in fig. 8: based on the expansion case of the automatic voltage-stabilizing charging pile of the pre-balancing system, the internet of things module is removed from the dual-power charging pile, and other structures are consistent with those in fig. 4.

As shown in fig. 9: based on the expansion case of the automatic voltage-stabilizing charging pile of the pre-balancing system, fig. 6 shows that the module of the internet of things is removed from the charging pile with the single power supply, and other structures are consistent with those in fig. 5.

As shown in fig. 10: an expansion case of the automatic voltage-stabilizing charging pile based on the pre-balancing system is shown in fig. 7, the internet of things module is removed from the single-power charging pile, and other structures are consistent with those in fig. 6.

The above embodiments are preferred embodiments of the present invention, and it will be apparent to those skilled in the art that other corresponding changes may be made according to the above technical solutions and concepts, or changes, variations, modifications, and substitutions may be made in the embodiments without departing from the principles and control methods of the present invention.

Claims

1. The automatic voltage-stabilizing charging pile based on the pre-balancing system is characterized in that the charging pile is of a three-inlet two-outlet type structure, the input end of the charging pile is connected with two phase lines and an N line of a three-phase alternating-current power supply, the output end of the charging pile is connected with the phase lines and the N line of a single-phase line of an electric automobile, and the automatic voltage-stabilizing charging pile of the pre-balancing system comprises a three-way sampling module, an intelligent control module, a driving module, a dual-power module and an Internet of.

2. The three-way sampling module comprises phase voltage detection and load current detection and is used for detecting a two-phase power supply of a low-voltage line and detecting the current of a phase line of a single-phase charging circuit of the automobile; the power supply detection input end is connected in parallel to two phase line loops of a three-phase alternating current circuit of the low-voltage circuit, and the output end is connected with the intelligent control module; the current detection input end is connected to the automobile single-phase charging loop in parallel, and the module output end is connected with the intelligent control module;

the dual-power module adopts a single-phase current source module and a single-phase voltage source module to supply power to the intelligent control module, the input end of the current source module is connected with a single-phase low-voltage circuit, the output end of the current source module is connected with a power pin of the single-chip microcomputer, the input end of the voltage source module is connected with the single-phase low-voltage circuit, and the output end of the;

3. The operating characteristics of automatic voltage stabilization stake of charging based on pre-balance system of claim 1, characterized by:

the operational characteristics of the internet of things module of the automatic voltage stabilization charging pile based on the pre-balancing system as claimed in claim 1, wherein:

when the charging pile detection device works when the current sampling value of a single-phase line of a user is lower than a preset value, the intelligent control module transmits power supply sampling information to the cloud end through the Internet of things module;