CN204013276U - A kind of based on numerically controlled bidirectional energy-storage current transformer hardware system - Google Patents

Abstract

The utility model provides a bidirectional energy storage converter hardware control system based on digital control, including DSP, FPGA, peripheral circuits connected and communicating with DSP and FPGA, and an upper computer control module; the two controllers of DSP and FPGA pass through 16 The 19-bit address bus is connected to the 19-bit data bus, and all the IO ports of the DSP are connected to the FPGA; the peripheral circuit includes a voltage and current sampling circuit, a power tube drive circuit, a power tube protection circuit, and a communication circuit between the upper computer and the lower computer; The voltage and current sampling circuit measures the voltage and current signals of various channels and sends them to DSP for sampling processing; the power tube drive circuit amplifies the power tube PWM drive signal output by the FPGA and sends it to the main power circuit of the bidirectional energy storage converter; the power tube protection The circuit collects the overcurrent protection signal and overtemperature protection signal output by the IGBT module of the bidirectional energy storage converter and transmits them to the FPGA; the DSP communicates with the upper computer control module through the communication circuit between the upper computer and the lower computer. The utility model provides a digital control-based bidirectional energy storage converter hardware control system.

Description

A hardware control system of bidirectional energy storage converter based on digital control

technical field

The utility model relates to the technical field of large-scale electric energy storage and grid new energy access, in particular to a digital control-based bidirectional energy storage converter hardware control system.

Background technique

The emergence and development of large-capacity energy storage technology has subverted the concept that electric energy cannot be stored in large quantities in traditional power systems. The power supply reliability and power quality of the power system, on the other hand, play a key role in the safe and reliable connection of intermittent renewable energy such as wind and solar power to the grid. Since the large-scale energy storage system can run through all links of power system generation, transmission, distribution, and use, it not only improves and improves the traditional power, but also the development and application of energy storage technology will also bring great benefits to the planning, design, and application of smart grids. Revolutionary changes have been brought about in layout and operation management.

As the connector between the power grid and the energy storage battery, the energy storage converter shoulders the heavy responsibility of charging the battery and returning electric energy to the grid. It is one of the key equipment in the power energy storage system. , service life and stable operation of the power grid play a vital role; its operation mode, control accuracy and response speed are directly related to the performance of the entire energy storage system. With the rapid development of large-scale system integration of battery energy storage and large-scale battery energy storage power stations, the performance requirements of the power grid for energy storage converters will also rise to a higher level.

Utility model content

The utility model relates to a bidirectional energy storage converter hardware control system based on digital control. The bidirectional energy storage converter hardware control system includes DSP, FPGA, peripheral circuits connected and communicating with DSP and FPGA, and an upper computer control system. module;

The two controllers of the DSP and the FPGA are connected by a 16-bit address bus and a 19-bit data bus, and all the IO ports of the DSP are connected with the FPGA;

The peripheral circuit includes a voltage and current sampling circuit, a power tube drive circuit, a power tube protection circuit, and a communication circuit between an upper computer and a lower computer;

One end of the voltage and current sampling circuit is connected to the main power circuit of the bidirectional energy storage converter and the other end is connected to the DSP;

One end of the power tube drive circuit is connected to the FPGA and the other end is connected to the main power circuit of the bidirectional energy storage converter;

One end of the power tube protection circuit is connected to the IGBT module of the bidirectional energy storage converter and the other end is connected to the FPGA;

The DSP is connected and communicated with the control module of the upper computer through the communication circuit between the upper computer and the lower computer.

In the first preferred embodiment provided by the utility model: the main controller DSP selects C2000 series TMS320F2812PGF-176 produced by TI Company.

In the second preferred embodiment provided by the utility model: the auxiliary controller FPGA selects the Cyclone series EP1C6024017N produced by ALTERA Company.

In the third preferred embodiment provided by the utility model: the voltage and current sampling circuit includes a Hall voltage sensor, a Hall current sensor, a conditioning circuit and an optocoupler isolation circuit, and one end of the Hall voltage sensor and the Hall current sensor are respectively connected The other end of the main power circuit of the bidirectional energy storage converter is connected to the DSP through the signal conditioning circuit and the optocoupler isolation circuit 1 respectively.

In the fourth preferred embodiment provided by the utility model: the power tube drive circuit includes a power amplifier and an optocoupler isolation circuit 2, and the FPGA output is isolated from the power amplifier by the optocoupler isolation circuit 2 .

In the fifth preferred embodiment provided by the utility model: the power tube protection circuit includes an optocoupler isolation circuit 3 .

In the sixth preferred embodiment provided by the present utility model: the peripheral circuit includes a power supply circuit;

The power supply circuit mainly provides power supply support for DSP, FPGA and other control circuits in the bidirectional energy storage converter, including 1.9V, 3.3V, 5V, ±15V, and different voltages are isolated from each other.

In the seventh preferred embodiment provided by the present utility model: the peripheral circuit includes a clock circuit;

The clock circuit includes a DSP clock circuit and an FPGA clock circuit, the DSP clock circuit is provided by a 30MHz active crystal oscillator, and the FPGA clock circuit is provided by a 33MHz active crystal oscillator.

In the eighth preferred embodiment provided by the utility model: the peripheral circuit includes a switch control circuit and a working state judgment circuit;

The switch control circuit controls the switch connected to the cooling fan of the converter, the indicator light and the main power circuit breaker;

The working state judging circuit is connected to detect the real-time opening and closing state of each switch of the converter system.

In the ninth preferred embodiment provided by the utility model: the peripheral circuit includes Flash memory, SRAM memory, reset circuit, CAN BUS, EEPROM, LED array, buzzer, key, and dial switch.

The beneficial effects of the digital control-based bidirectional energy storage converter hardware control system provided by the utility model include:

1. The utility model provides a bidirectional energy storage converter hardware control system based on digital control, built on the basis of dual CPUs, combining the powerful data processing capability of DSP with the high integration and reprogrammability of FPGA, in order to realize The automatic and intelligent control of the converter provides compact, reliable and high real-time hardware support.

Description of drawings

As shown in Figure 1, it is a structural schematic diagram of the connection between the hardware control system of a bidirectional energy storage converter based on digital control and the main power circuit provided by the utility model;

Figure 2 is a structural schematic diagram of an embodiment of the structure of a bidirectional energy storage converter hardware control system based on digital control provided by the present invention;

As shown in Figure 3, it is a control block diagram of the connection between the hardware control system of a bidirectional energy storage converter based on digital control and the main power circuit provided by the utility model;

FIG. 4 is a control flow chart of a digital control-based bidirectional energy storage converter hardware control system provided by the present invention.

Detailed ways

The specific embodiment of the utility model will be described in further detail below according to the accompanying drawings.

The utility model provides a bidirectional energy storage converter hardware control system based on digital control. DSP and FPGA are connected to the peripheral circuit of communication and the upper computer control module. The two controllers of DSP and FPGA are connected through a 16-bit address bus and a 19-bit data bus to realize high-speed data transmission and enhance the real-time control of the two. In addition, all IO ports of DSP are connected to FPGA, and input and output The signals are deburred and jitter-cut by FPGA, which enhances the accuracy of control.

The peripheral circuit includes a voltage and current sampling circuit, a power tube drive circuit, a power tube protection circuit, and a communication circuit between the upper computer and the lower computer. One end of the voltage and current sampling circuit is connected to the main power circuit of the bidirectional energy storage converter, and the other end is connected to the DSP; one end of the power tube drive circuit is connected to the main power circuit of the bidirectional energy storage converter; the other end of the power tube protection circuit is connected to the bidirectional energy storage converter. The other end of the IGBT module of the energy converter is connected to the FPGA; the DSP communicates with the control module of the upper computer through the communication circuit between the upper computer and the lower computer.

Further, the voltage and current sampling circuit measures the voltage and current signals of various channels and sends them to the DSP for sampling processing; the power tube drive circuit amplifies the power of the power tube PWM drive signal output by the FPGA and sends it to the main power circuit of the bidirectional energy storage converter; The power tube protection circuit collects the overcurrent protection signal and overtemperature protection signal output by the IGBT module of the bidirectional energy storage converter and transmits them to the FPGA.

As shown in Figure 2, it is a schematic structural diagram of an embodiment of the structure of a bidirectional energy storage converter hardware control system based on digital control provided by the present invention. It can be seen from Figure 2 that the voltage and current sampling circuit includes a Hall voltage sensor, Hall current sensor, conditioning circuit and optocoupler isolation circuit, one end of the Hall voltage sensor and Hall current sensor are respectively connected to the main power circuit of the bidirectional energy storage converter, and the other end is connected to the DSP through the signal conditioning circuit and the optocoupler isolation circuit 1 respectively. After the Hall voltage sensor and the Hall current sensor measure the voltage and current signals of various channels, the output voltage and current values are limited by the signal conditioning circuit and isolated by the optocoupler isolation circuit 1, and then sent to the DSP for sampling processing.

The power tube drive circuit includes a power amplifier and an optocoupler isolation circuit 2, wherein an optocoupler isolation circuit 2 is added between the FPGA output and the power amplifier to prevent the control circuit from being affected by the main power circuit, increase the anti-interference ability of the control circuit, and drive the power tube The circuit is mainly used to amplify the power of the power transistor PWM drive signal output by the FPGA to improve the drive capability of the system.

The power tube protection circuit includes an optocoupler isolation circuit 3, which is mainly used to collect the over-current protection signal and over-temperature protection signal output by the IGBT module of the bidirectional energy storage converter, and the rectification and inverter module of the bidirectional energy storage converter. Each voltage module outputs three over-current protection signals and one over-temperature protection signal. All the protection signals are sent to the FPGA for OR processing through the optocoupler isolation circuit 3. The generation of any protection signal will make the FPGA send a PWM blocking signal to the DSP. , Prohibit the action of the power tube to ensure the safety of the converter system.

The DSP connects and communicates with the control module of the upper computer through the communication circuit between the upper computer and the lower computer. The communication circuit between the upper computer and the lower computer is established based on the RS232 communication protocol, and a filter circuit is added to prevent the interference signal from entering.

The main controller DSP selects C2000 series TMS320F2812PGF-176 produced by TI Company, and the auxiliary controller FPGA selects Cyclone series EP1C6024017N produced by ALTERA Company.

Peripheral circuits also include power supply circuit, clock circuit, switch control circuit, working state judgment circuit, Flash memory, SRAM memory, reset circuit, CAN BUS (Controller Area Network Bus, controller area network bus), EEPROM, LED array, buzzer Devices, keys, DIP switches and other functional modules.

The power circuit mainly provides power support for DSP, FPGA and other control circuits in the bidirectional energy storage converter, including 1.9V, 3.3V, 5V, ±15V, etc. Different voltages are isolated from each other to improve the safety and security of the entire system. anti-interference.

The clock circuit includes a DSP clock circuit and an FPGA clock circuit. The DSP clock circuit is provided by a 30MHz active crystal oscillator, and the FPGA clock circuit is provided by a 33MHz active crystal oscillator.

The FPGA controls the work of the switch of the main power circuit of the converter through the switch control circuit. The switch control circuit is mainly connected to the cooling fan of the converter, the indicator light and the switch of the main power circuit breaker, and is mainly used to control the cooling fan of the converter, Indicator light and switch control of main power circuit breaker.

The FPGA detects the real-time opening and closing status of each switch of the converter system through the working status judgment circuit, so as to judge the operation stage of the converter, and finally realize the automatic and intelligent operation of the whole system.

As shown in Fig. 3 and Fig. 4, respectively, a control block diagram and a control flow chart of the connection between a bidirectional energy storage converter hardware control system based on digital control and the main power circuit provided by the utility model.

It can be seen from Figure 3 and Figure 4 that the DSP main controller module mainly implements sampling, calculation and processing of the real-time operating voltage and current values of the main power circuit of the converter, and receives the operating commands issued by the host computer. The DSP establishes two-way communication with the host computer through RS232, and can set the working status and parameters of the system and receive system feedback information through the host computer in real time. The DSP has 16 built-in AD conversion channels to sample the voltage and current signals of the main power circuit of the bidirectional energy storage converter. After the sampled signal is processed, it forms a feedback and compares it with the system setting. The result of the feedback and the PI operation of the given value Send it to the event manager to send out 12 channels of PWM driving waveforms with adjustable duty ratios, among which PWM1-6 are used to drive the rectifier and inverter PEBB module of the converter, and PWM7-12 are used for the step-up and step-down PEBB module of the converter drive.

The FPGA auxiliary controller module assists the main controller DSP to complete the automatic control of the entire converter. The PWM driving signal output by the DSP is first processed by the FPGA for vibration reduction processing. After processing, the PWM1-6 are directly output to the interface circuit, and the PWM7-12 are phase-shifted by the FIFO for driving the three-phase interleaved buck-boost module. The output voltage and current ripple of the DC side is small, and the PWM control signal of the AC/DC module is directly transmitted to the PEBB drive circuit after being debounced and deburred by the FPGA to control the switching action of the power tube. The PWM signal of the DC/DC module is shifted by the FPGA. After phase drive PEBB action. The AC/DC module PWM driving signal is generated by the event manager A, and the DC/DC module PWM driving signal is generated by the event manager B. FPGA also collects system working status signals in real time and controls the switching action of the main circuit; when the PEBB module generates an over-current or over-temperature protection signal, the protection signal is first sent to the FPGA, and after processing by the FPGA, a low-level trigger signal is generated and sent to the DSP, PDP interrupt is triggered, and DSP locks PWM output to protect the device.

The upper computer control module realizes the serial port communication with the DSP through RS-232, which is mainly used to issue control instructions, operating parameters and other control information to the DSP, and receive the running status and parameter information of the converter uploaded by the DSP in real time and display them through the interface. Enhance the human-computer interaction capability of the system. Specifically, the upper computer control module realizes the serial port communication with the energy storage battery BMS system through RS-485, reads the battery voltage, charge and discharge current, temperature, SOC and other information in real time and displays them through the interface; through the TCP/IP Modbus communication protocol and The communication of the remote monitoring system realizes the remote control of the energy storage converter. It can remotely control the operating status of the converter such as startup, shutdown, and suspension, set the operating parameters of the converter in real time, and read the status of the converter system. real-time operating parameters. The user can control the system operating mode in real time through the host computer interface, write and read system operating parameters, such as output voltage and current set values, real-time voltage and current sampling values, PID parameters, etc. There are two control modes: manual control and remote automatic control. The lower computer regularly sends the real-time sampling values of the electrical parameters of the system to the upper computer, and the working status of the system can be observed through the display on the upper computer interface.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: it is still possible Any modification or equivalent replacement made to the specific implementation of the present utility model without departing from the spirit and scope of the present utility model shall be covered by the claims of the present utility model.

Claims (10)

1. A bidirectional energy storage converter hardware control system based on digital control, characterized in that, the bidirectional energy storage converter hardware control system includes DSP, FPGA, peripheral circuits connected to communicate with DSP and FPGA, and a host machine control module; The two controllers of the DSP and the FPGA are connected by a 16-bit address bus and a 19-bit data bus, and all the IO ports of the DSP are connected with the FPGA; The peripheral circuit includes a voltage and current sampling circuit, a power tube drive circuit, a power tube protection circuit, and a communication circuit between an upper computer and a lower computer; One end of the voltage and current sampling circuit is connected to the main power circuit of the bidirectional energy storage converter and the other end is connected to the DSP; One end of the power tube drive circuit is connected to the FPGA and the other end is connected to the main power circuit of the bidirectional energy storage converter; One end of the power tube protection circuit is connected to the IGBT module of the bidirectional energy storage converter and the other end is connected to the FPGA; The DSP is connected and communicated with the control module of the upper computer through the communication circuit between the upper computer and the lower computer. 2. The hardware control system of the bidirectional energy storage converter according to claim 1, wherein the main controller DSP is a C2000 series TMS320F2812PGF-176 produced by TI Company. 3. The bidirectional energy storage converter hardware control system according to claim 1, wherein the auxiliary controller FPGA is Cyclone series EP1C6024017N produced by ALTERA Company. 4. The bidirectional energy storage converter hardware control system according to claim 1, wherein the voltage and current sampling circuit comprises a Hall voltage sensor, a Hall current sensor, a conditioning circuit and an optocoupler isolation circuit, and the Hall One end of the Hall voltage sensor and the Hall current sensor are respectively connected to the main power circuit of the bidirectional energy storage converter, and the other end is respectively connected to the DSP through the signal conditioning circuit and the optocoupler isolation circuit 1 . 5. The bidirectional energy storage converter hardware control system as claimed in claim 1, wherein said power tube drive circuit comprises a power amplifier and an optocoupler isolation circuit 2, and said FPGA output is connected to said power amplifier. The space is isolated by the optocoupler isolation circuit 2. 6 . The hardware control system of bidirectional energy storage converter according to claim 1 , wherein the power tube protection circuit includes an optocoupler isolation circuit 3 . 7. The bidirectional energy storage converter hardware control system according to claim 1, wherein the peripheral circuit comprises a power supply circuit; The power supply circuit mainly provides power supply support for DSP, FPGA and other control circuits in the bidirectional energy storage converter, including 1.9V, 3.3V, 5V, ±15V, and different voltages are isolated from each other. 8. The bidirectional energy storage converter hardware control system according to claim 1, wherein the peripheral circuit comprises a clock circuit; The clock circuit includes a DSP clock circuit and an FPGA clock circuit, the DSP clock circuit is provided by a 30MHz active crystal oscillator, and the FPGA clock circuit is provided by a 33MHz active crystal oscillator. 9. The bidirectional energy storage converter hardware control system according to claim 1, wherein the peripheral circuit comprises a switch control circuit and a working state judgment circuit; The switch control circuit controls the switch connected to the cooling fan of the converter, the indicator light and the main power circuit breaker; The working state judging circuit is connected to detect the real-time opening and closing state of each switch of the converter system. 10. The bidirectional energy storage converter hardware control system according to claim 1, wherein the peripheral circuit includes Flash memory, SRAM memory, reset circuit, CAN BUS, EEPROM, LED array, buzzer, button ,DIP switch.