KR20210113008A - Battery charge and discharge test system with energy recycling - Google Patents

Abstract

The present invention relates to a battery charge and discharge test system capable of energy recycling and, more specifically, to a charger simulator device for battery charge and discharge performance verification and a battery charge and discharge test system capable of energy recycling using renewable energy and regenerative energy generated during charging and discharging. The present invention has an effect that a variety of batteries can be responded to through stable boost and decompression control with a power system by applying a two-way DC-DC converter to batteries of a variety of voltage or current specifications instead of a specific battery.

Description

BATTERY CHARGE AND DISCHARGE TEST SYSTEM WITH ENERGY RECYCLING}

The present invention relates to a battery charging/discharging test system capable of energy recycling, and more particularly, a device of a charger simulator for verifying battery charging/discharging performance, and energy recycling using renewable energy and regenerative energy generated during charging/discharging. It relates to a battery charge and discharge test system.

Currently, various industries at home and abroad are developing eco-friendly energy technology using batteries. In particular, the energy tested by companies developing battery charging devices for electric vehicles and ships, renewable energy, and hydrogen energy is consumed and wasted as thermal energy using a brake resistor loader.

In addition, in the process of braking the motor in the inverter for driving the induction motor, regenerative energy is generated from the motor, which increases the DC-link voltage inside the inverter, which is a major cause of failure. To solve this problem, there are a method of dissipating the regenerative energy into thermal energy through a Dynamic Braking Resistor (DBR) and a method of returning the regenerative energy to the power system using a regenerative converter. The regenerative inverter is a power converter that is disposed between an inverter that performs variable speed control of an AC motor and an AC power source and regenerates an induced electromotive force generated when the AC motor is decelerated into an AC power source.

In addition, when using a method in which regenerative energy is consumed from the resistor in the dynamic brake unit like the inverter according to the prior art, a separate dynamic brake resistor and a cooling device for cooling the heat generated from the resistor must be installed, so a lot of space is required. There were many difficulties in miniaturizing the inverter because it was required. In addition, although the braking torque of the motor is improved, there is a problem in that the efficiency is significantly lowered because the regenerative energy cannot be utilized at all.

KR10-0981438B1

The present invention was devised to solve such a problem, and a test energy reuse system using a DC-DC converter and a grid inverter for consumed and wasted energy, and a system for simulating the energy load performance used in various new and renewable energy research An object of the present invention is to provide a battery charge/discharge test system capable of energy recycling to test the battery.

Another object of the present invention is to provide a device of a charger simulator for verifying battery charging/discharging performance and a battery charging/discharging test system capable of energy recycling using renewable energy and regenerative energy generated during charging/discharging.

In addition, we provide a charger solution using various input power based on DC power grid connection using a bidirectional DC-DC converter and an inverter module and an energy-saving test system for performance verification. The purpose.

According to one aspect of the battery charge-discharge test system capable of energy recycling according to the present invention for achieving the above object, a battery provided with various voltage or current specifications for the charge-discharge test; a bidirectional DC transformer for applying to the DC power system by controlling the voltage to be applied to the DC power system according to the power specifications required for batteries of various voltage or current specifications and various charging loads; a charging device for charging a charging load by the DC converted by the bidirectional DC transformer; an inverter that regenerates energy lost during the charging/discharging test of the charging device and supplies DC power to a DC power system or receives DC power to use a propulsion motor or an AC load; a management controller for managing energy management control when the energy lost in the inverter is regenerated and a state of the battery and the load side; and a display device configured to display the charging/discharging test operation state of the battery and the charging device, the load side state, and input/output power state information under the control of the management controller.

In addition, the bi-directional DC transformer can control the voltage in the buck-boost converting method during the DC power transformation test.

In addition, the inverter may regenerate the energy lost during the charging/discharging test of the charging device to the input power system.

In addition, the management controller may monitor the battery and load side state information in real time to analyze and predict performance according to usage conditions in real time to process failures or warnings or utilize them as predictive alarms.

Also, the display device may configure various charge/discharge test environments by changing at least one parameter.

According to the present invention, a bidirectional DC converter is applied to a battery of various voltage or current specifications, not a specific battery, so that various batteries can be stably boosted and reduced through the power supply system.

In addition, charging/discharging tests are possible using an inverter (DC-AC Inverter) with a regenerative function, and the energy generated during the charging/discharging test of the charging device is recycled to the power system-connected device to reduce power consumption and configure As a master management controller for the exchange of integrated information between devices, it can automate the operating system and tests, process failure warning signals automatically, and increase the reliability and convenience of information expressed through a visual information delivery device. .

In addition, the test system of the present invention requires performance improvement and performance testing of commercial electric vehicle (EV) battery chargers used in the continuously rising electric vehicle and electric ship industries, and recycling of energy lost during each test is required. ), it has the effect of establishing an energy-saving test environment.

In addition, there is an effect that can monitor intelligent control and integrated energy management by linking various energy sources to the DC power system and at the same time using communication protocols between each system configuration to increase the utilization of power.

1 is a diagram showing the configuration of a general battery charge/discharge test system.
2 is a diagram illustrating a configuration of an energy recyclable battery charge/discharge test system according to an embodiment of the present invention.
3 is a diagram illustrating an example of a main screen of an energy recyclable battery charge/discharge test system according to an embodiment of the present invention.
4 is a diagram illustrating an example of an energy recyclable battery charge/discharge test system setting screen according to an embodiment of the present invention.
5 is a diagram illustrating an example of a simulation screen of an energy recyclable battery charge/discharge test system according to an embodiment of the present invention.
6 is a diagram illustrating an example of an energy recyclable battery charge/discharge test system analysis screen according to an embodiment of the present invention.
7 is a diagram illustrating a control configuration of a bidirectional DC transformer (DC-DC transformer) in FIG. 2 .

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the inventor should properly understand the concept of the term in order to best describe his invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept consistent with the technical idea of the present invention. Therefore, the configuration shown in the embodiments and drawings described in the present specification is only the most preferred embodiment of the present invention and does not represent all the technical spirit of the present invention, so at the time of the present application, various It should be understood that there may be equivalents and variations.

1 is a view showing the configuration of a general battery charge/discharge test system, an energy storage device 10 and an electric vehicle (EV-CAR) in the charging device 60 by alternating current (AC) applied from the power system 40 ( 70) applies direct current (DC) to perform a battery charge/discharge test, and the management controller 50 controls each component to perform battery charge/discharge test control. However, the energy to be tested is consumed and wasted as thermal energy through the braking resistor 80 .

2 is a diagram showing the configuration of an energy recyclable battery charge/discharge test system according to an embodiment of the present invention, and FIG. 3 shows an example of a main screen of an energy recyclable battery charge/discharge test system according to an embodiment of the present invention 4 is a view showing an example of an energy recyclable battery charge/discharge test system setting screen according to an embodiment of the present invention, and FIG. 5 is an energy recyclable battery charge/discharge test system according to an embodiment of the present invention It is a diagram showing an example of a simulation screen, and FIG. 6 is a diagram showing an example of an energy recyclable battery charge/discharge test system analysis screen according to an embodiment of the present invention.

As shown, the energy recyclable battery charge/discharge test apparatus of the present invention includes an energy storage device 100 , a bidirectional DC transformer 200 , an inverter 300 , a power system connection device 400 , and a management controller 500 , a charging device 600 , an electric vehicle (EV-CAR) 700 , and a display device 800 may be included.

The energy storage device 100 may mean a battery for storing electrical energy. The battery may be provided with various specifications, and through this, a charge/discharge test may be performed on a battery having various voltage or current specifications rather than a specific battery.

The bidirectional direct current transformer (DC-DC converter) 200 is a converter that converts DC (direct current) into DC (direct current) and may convert a voltage into DC (direct current). Electronic devices such as ICs have different operable voltage ranges, so it is necessary to generate an appropriate voltage for each. can That is, in the present invention, in order to cope with a wide range of battery voltage and power, a bidirectional DC converter (DC-DC Converter) 200 is applied to control stable voltage transformation (step-up and pressure reduction) of various batteries into the power system and apply to the DC power system. can do. In other words, by applying the bidirectional direct current transformer (DC-DC Converter) 200 to a battery of various voltage or current specifications rather than a specific battery, it is possible to respond to various batteries through stable voltage boosting and pressure reducing control to the power system. That is, in the present invention, by applying a bidirectional DC converter (DC-DC Converter) 20, various batteries can be applied to the DC power system by stably controlling the boosting and reducing the voltage to the power system.

The inverter (DC-AC Inverter) 300 may convert DC (direct current) transformed in the bidirectional DC transformer 200 into AC (alternating current) and supply it to a motor or an AC load. That is, a charge/discharge test can be performed using the DC-AC Inverter 300 connected to the DC power system with a regenerative function through the power system connection device 400 . That is, in the present invention, a charging/discharging test is possible through the power system connection device 400 using an inverter (DC-AC Inverter) 300 having a regenerative function, and the device configuration is relatively light and simple, so it is operated with mobility. There are advantages to doing. As described above, in the present invention, an actual charge/discharge test can be performed through the control of the power system connection device 400 using an inverter (DC-AC Inverter) 300 that can be connected to the DC power system and has a regenerative function, and energy Recycling may be possible.

The management controller 500 discharges energy to the power system during the charge/discharge test or can be used as a load, so it is possible to manage energy management control for recycling energy that is generally burned as thermal energy and the battery and load side states. In addition, data can be intuitively managed by using a visual display device (HMI) 800 for visual transmission of information and simple manipulation. That is, in the present invention, intuitive data management is easy through the controller (PLC) and the display device (HMI) 800 corresponding to the management controller 500 , and various test environments can be configured through simple parameter changes. In addition, it is possible to obtain status information in real time through the management controller 500 that manages the battery and load side status and operation, and analyze and predict the performance according to the usage conditions in real time to handle failures or warnings or to use them for predictive alarms. That is, based on the database of the management controller 500 , it is possible to intuitively control and manage data by using a visual display device for visual transmission and simple manipulation of data. That is, the management controller 500 may be configured as a PLC, and may control the battery and charger, the load side state, and the charge/discharge test operation to be performed. In addition, it is easy to check the input/output power source status and intuitive data management through the display device (HMI) 800, and it is possible to configure various test environments (condition, status) and recycled energy management screen through simple parameter changes. can

The charging device 600 performs a charging/discharging test or simulation for the battery 100 or the electric vehicle 700 by using the energy recycled through the power system by the regenerative function of the inverter (DC-AC Inverter) 300 . can

As described above, in the present invention, the device control method of the charger simulator for verifying the battery charge/discharge performance and the energy for the battery and its charging device by recycling the lost energy (consumed as thermal energy of the braking resistor) generated during the charge/discharge test A cost-effective test system can be provided. In addition, it can be used as an energy recycling system for testing systems that simulate energy load performance used in various renewable energy research.

That is, in the present invention, a bidirectional DC transformer (DC-DC transformer) 200 is applied to a battery 100 and an electric vehicle (EV-CAR) 700 of various voltage or current specifications, not a specific battery, to provide various charging loads. It is possible to provide a charge/discharge test device or simulator that can respond stably through step-up and pressure-reduction control with required power specifications. In addition, it is possible to provide an energy recycling system that regenerates lost energy generated when the charger is tested without a charging load and is regenerated into the input power system. For example, as in the main screen for the charge/discharge test illustrated in FIG. 3 , power using a bidirectional DC transformer (DC-DC transformer) 200 and an inverter with a regenerative function (DC-AC Inverter) 300 Actual charge/discharge test can be done through system control, and energy recycling can be possible. In addition, as illustrated in FIG. 4 , bidirectional current flow control, control valve selection, alarm, etc. may be set for actual charge/discharge test through power system control. In addition, as illustrated in the simulation screen illustrated in FIG. 5 , an interface for an actual charge/discharge test through power system control may be provided, and current, voltage, power, processing time and charge rate may be displayed. In addition, on the analysis screen illustrated in FIG. 6 , the maximum voltage/current value, connection and state information, and error information according to the simulation may be displayed.

7 is a diagram illustrating a control configuration of a bidirectional DC transformer (DC-DC transformer) in FIG. 2 .

As shown, the bidirectional DC transformer (DC-DC transformer) 200 of the present invention utilizes the bidirectional DC transformer (DC-DC transformer) 200 in performing step-up / voltage reduction in response to the battery 100 . DC power transformer test can be performed. At this time, the used bidirectional DC transformer (DC-DC transformer) 200 may be voltage-controlled in a buck-boost converting method, and may be tested using a bidirectional large-capacity DC transformer (step-up/step-down). In addition, current ripple stabilization control algorithm can be applied to input/output terminals (P1, N1-P2, N2), and current control corresponding to DC voltage deviation (potential difference) and proportional (closed-loop) control can be performed. have. In addition, flexible voltage testing according to the connection of different types of batteries and DC energy sources to the DC Grid link is possible, DC Grid input/output terminal management (switching) corresponding to two or more DC power supplies is possible, and the required capacity is applied to the load power system. It is possible to carry out the load performance test of the rated DC transformer.

In addition, in the present invention, when a DC-AC inverter having a regenerative function is applied, an AC-DC converter and a DC-AC inverter 300 may be used. That is, it is possible to use a propulsion motor (M) or an AC load by supplying or receiving DC power to a DC power system (DC Grid). In particular, the system of the present invention applies a DC-AC inverter and a bidirectional DC-DC converter to use a variety of power sources (AC or DC power source) for linking the DC grid to realize stable output characteristics in the system. It is possible to provide a power input/output system for In addition, an integrated energy management and control system can be provided by additionally installing a switching device and a power monitoring device. In addition, in the present invention, intuitive data management such as a screen for performing battery and charger, load side status and charge/discharge test operation, and input/output power source status check, etc., can be easy, and a variety of test environments can be achieved through simple parameter changes. (condition, state) can be configured.

As described above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of the present invention and the following by those of ordinary skill in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

100: energy storage device
200: bidirectional DC transformer
300: inverter
400: power system connected device
500: management controller
600: charging device
700: electric vehicle
800: display device

Claims (5)

Batteries available in various voltage or current specifications for charging and discharging testing;
a bidirectional DC transformer for applying to the DC power system by controlling the voltage to be applied to the DC power system according to the power specifications required for batteries of various voltage or current specifications and various charging loads;
a charging device for charging a charging load by the DC converted by the bidirectional DC transformer;
an inverter that regenerates energy lost during the charging/discharging test of the charging device and supplies DC power to a DC power system or receives DC power to use a propulsion motor or an AC load;
a management controller for managing energy management control when the energy lost in the inverter is regenerated and a state of the battery and the load side; and
and a display device for displaying a charge/discharge test operation state of the battery and the charging device, a load side state, and input/output power state information under the control of the management controller. The method according to claim 1,
The bidirectional DC transformer is
A battery charge/discharge test system capable of energy recycling, characterized in that the voltage is controlled by a buck-boost converting method during a DC power transformer test. The method according to claim 1,
The inverter is
A battery charging/discharging test system capable of energy recycling, characterized in that it regenerates energy lost during the charging/discharging test of the charging device to the input power system. The method according to claim 1,
The management controller,
A battery charge/discharge test system capable of energy recycling, characterized in that by monitoring the state information of the battery and the load side in real time, and analyzing and predicting the performance according to the usage conditions in real time to handle a failure or warning or use it as a predictive alarm. The method according to claim 1,
The display device is
A battery charge/discharge test system capable of energy recycling, characterized in that it is possible to configure various charge/discharge test environments by changing at least one parameter.

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