CN219592126U - Bidirectional energy storage converter control device - Google Patents
Bidirectional energy storage converter control device Download PDFInfo
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- CN219592126U CN219592126U CN202320177599.0U CN202320177599U CN219592126U CN 219592126 U CN219592126 U CN 219592126U CN 202320177599 U CN202320177599 U CN 202320177599U CN 219592126 U CN219592126 U CN 219592126U
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Abstract
The utility model provides a control device of a bidirectional energy storage converter. The bidirectional energy storage converter comprises a first-stage IGBT driving module and a second-stage IGBT driving module which are connected through a capacitor pool, wherein the capacitor pool is used for temporarily storing electric energy; the device comprises a signal acquisition circuit, a main control chip and a PWM level conversion circuit; the signal acquisition circuit is connected with the main control chip, acquires voltage and current signals of the energy storage medium end, the power grid end and the grid connection point, and sends the voltage and current signals to the main control chip; the main control chip generates an inversion control signal or a rectification control signal according to the voltage and current signals and sends the inversion control signal or the rectification control signal to the PWM level conversion circuit; and the PWM level conversion circuit performs variable current control in the charging or grid connection process on the first-stage IGBT driving module and the second-stage IGBT driving module. The utility model can ensure the safe and stable operation of the system.
Description
Technical Field
The utility model relates to the technical field of electrical control, in particular to a bidirectional energy storage converter control device.
Background
The new energy is more and more heavy in the energy industry, the power generation of wind power and photovoltaic power generation of the new energy tap is affected by the environment, the continuous output quantity is unstable, and the power generation grid connection needs stable output of energy. In order to avoid unnecessary waste of energy, energy storage means for new energy is indispensable.
The traditional energy storage converter transmits electric energy in an energy storage medium to a power grid through a three-phase inverter in a signal waveform of the power grid; during charging, the inverter is converted into a three-phase rectifier bridge, and electric energy generated by a power grid or wind power is stored. The control device of the energy storage converter has the advantages of less input quantity, less control quantity and simple logic. But the reliability is not high, grid-connected signals are unstable, distortion is easy to generate, the operation of the converter system is influenced, the voltage of charging signals is unstable, irreversible influence can be generated on an energy storage medium, and the life cycle of an energy storage converter system product is short.
Disclosure of Invention
The embodiment of the utility model provides a bidirectional energy storage converter control device. The problem of unstable operation of the bidirectional energy storage converter system is solved.
The utility model provides a control device of a bidirectional energy storage converter, which is used for controlling the bidirectional energy storage converter, wherein the bidirectional energy storage converter comprises an IGBT driving system, the IGBT driving system comprises a first-stage IGBT driving module and a second-stage IGBT driving module which are connected through a capacitor pool, and the capacitor pool is used for temporarily storing electric energy;
the bidirectional energy storage converter control device comprises a signal acquisition circuit, a main control chip and a PWM level conversion circuit;
The signal acquisition circuit is connected with the main control chip, acquires voltage and current signals of the energy storage medium end, the power grid end and the grid connection point, and sends the voltage and current signals to the main control chip;
the main control chip generates an inversion control signal or a rectification control signal according to the voltage and current signals and sends the inversion control signal or the rectification control signal to the PWM level conversion circuit;
the PWM level conversion circuit converts the inversion control signal or the rectification control signal into a PWM control signal, and charges the first-stage IGBT driving module and the second-stage IGBT driving module through the PWM control signal or performs variable current control in the grid-connected process.
In one possible implementation, the PWM level conversion circuit includes a first stage PWM level control module and a second stage PWM level control module;
in a grid-connected state, the first-stage PWM level control module controls the first-stage IGBT driving module through a rectification control signal to perform DC-DC conversion, and transfer of electric energy from an energy storage medium to a capacitor pool is completed; the second-stage PWM level control module controls the second-stage IGBT driving module through an inversion control signal to perform inversion treatment, and the transfer of electric energy from the capacitor pool to the power grid is completed;
during a charging state, the second-stage PWM level control module controls the second-stage IGBT driving module through a rectification control signal to carry out rectification conversion, so that the transfer of electric energy from a power grid to a capacitor pool is completed; the first-stage PWM level control module controls the first-stage IGBT driving module through the inversion control signal to perform DC-DC conversion, and transfer of electric energy from the capacitor pool to the energy storage medium is completed.
In one possible implementation, the bidirectional energy storage converter control device includes a direct current side module and a grid side module;
the first-stage IGBT driving module is connected with the energy storage medium end through the direct-current side module to realize bidirectional DC-DC conversion;
the second-stage IGBT driving module is connected with a power grid end through a grid side module to realize bidirectional DC-AC conversion.
In one possible implementation, the signal acquisition circuit includes a first loop, a second loop, and a third loop;
the first loop, the second loop and the third loop are connected in parallel;
the bidirectional energy storage converter control device also comprises a rectification conditioning circuit, a threshold alarming circuit, a phase locking circuit and a signal processing circuit;
a loop sends the voltage and current of the energy storage medium end to a rectification conditioning circuit;
the rectification conditioning circuit rectifies the voltage and the current at the end of the energy storage medium to obtain the maximum value of the voltage and the current, and sends the maximum value of the voltage and the current to the threshold alarming circuit;
the threshold value alarm circuit compares the maximum value of the voltage and the current with a preset alarm threshold value, and when the maximum value of the voltage and the current is larger than or smaller than the preset alarm threshold value, an alarm signal is sent to the main control chip;
the second loop sends the voltage and current of the power grid end to the phase-locked circuit; the phase-locked circuit sends the phase information of the voltage and the current of the power grid end to the main control chip;
The three loops send the voltage and current of the grid-connected point to the signal processing circuit; the signal processing circuit converts the voltage and current of the grid-connected point into a signal which can be identified by the main control chip and sends the signal to the main control chip.
In one possible implementation manner, the bidirectional energy storage converter control device further comprises a temperature polling circuit, and the signal acquisition circuit further comprises a temperature acquisition circuit;
the temperature acquisition circuit is connected with the temperature polling circuit, acquires temperature information and sends the temperature information to the temperature polling circuit;
the temperature polling circuit is connected with the main control chip, and sends temperature information to the signal processing circuit when receiving a temperature inquiry instruction sent by the main control chip; the signal processing circuit converts the temperature information into a signal which can be identified by the main control chip and sends the signal to the main control chip.
In one possible implementation manner, the bidirectional energy storage converter control device further comprises a fault input circuit, an input isolation circuit, an output isolation circuit and a switch control circuit;
the fault input circuit is connected with the input isolation circuit, generates a switching value control signal according to a fault signal at any position of the bidirectional energy storage converter control device, and sends the switching value control signal to the input isolation circuit;
The input isolation circuit converts the switching value control signal into a first voltage value matched with the main control chip and sends the first voltage value to the main control chip;
the main control chip is connected with the output isolation circuit and sends a switching value control signal to the output isolation circuit;
the output isolation circuit converts the switching value control signal into a second voltage value matched with the switching control circuit and sends the second voltage value to the switching control circuit;
the switch control circuit controls the fault lamp or the control switch according to the second voltage value. In one possible implementation, the fault input circuit is an optocoupler isolation module;
the switch control circuit is a relay control module.
In one possible implementation manner, the bidirectional energy storage converter control device further comprises a communication circuit;
the communication circuit is connected with the main control chip and is used for realizing the communication between the bidirectional energy storage converter control device and the upper computer.
In one possible implementation manner, the bidirectional energy storage converter control device further comprises a control bottom plate and a main control plate;
the main control board comprises 2 base plate switching interfaces, wherein each base plate switching interface comprises DI and DO control connectors and an independent power supply interface;
The DI and DO control connectors are connected with the control bottom plate;
the independent power supply interface is used for independently supplying power to the main control board.
In one possible implementation manner, the main control board is provided with a power supply filtering module, a signal processing module, a communication module, an input power supply isolation module, an output power supply isolation module and a main control chip; the power supply filtering module is used for filtering the electric signal of the external power supply and supplying power to the main control chip through the filtered electric signal;
the signal processing module is connected with the main control chip; the main control chip is connected with the communication module;
the control bottom plate is provided with a power supply filtering module, a signal processing module, a PWM level conversion module, a sampling module, an optical coupling isolation module and a relay control module;
the power supply filtering module is used for filtering the electric signal of the external power supply and supplying power for the control bottom plate through the filtered electric signal;
the sampling module is connected with the signal processing module; the signal processing module is connected with a main control chip on the main control board; the master control chip is connected with the PWM level conversion module;
the optical coupling isolation module is connected with the main control chip through an input power isolation module on the main control board; the main control chip is connected with the relay control module through the output power isolation module.
The embodiment of the utility model provides a bidirectional energy storage converter control device, which is characterized in that voltage and current signals of an energy storage medium end, a power grid end and a grid connection point are acquired through a signal acquisition circuit, the acquired voltage and current signals are sent to a main control chip, the main control chip generates control signals according to the acquired voltage and current signals, and the control of an IGBT driving module is completed through a PWM level conversion circuit, wherein the IGBT driving module is divided into two stages, which comprise capacitor pools, can temporarily store electric energy, can improve the controllable voltage change range of a system, and play a role in buffering the voltage change in the conversion process of charging or grid connection, so that the stability of the system is improved, and the safe and stable operation of the system is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic circuit diagram of a bidirectional energy storage converter control device according to an embodiment of the present utility model;
fig. 2 is a topology diagram of a bidirectional energy storage converter control device according to an embodiment of the present utility model;
fig. 3 is a schematic diagram of an overall module structure of a bidirectional energy storage converter control device according to an embodiment of the present utility model;
fig. 4 is a voltage and current collection position diagram of an energy storage end of a bidirectional energy storage converter control device according to an embodiment of the present utility model;
fig. 5 is a diagram of a power grid side voltage and current acquisition position of a bidirectional energy storage converter control device according to an embodiment of the present utility model;
fig. 6 is a PCB diagram of a main control board of a bidirectional energy storage converter control device according to an embodiment of the present utility model;
fig. 7 is a PCB diagram of a control chassis of a bidirectional energy storage converter control device according to an embodiment of the present utility model;
fig. 8 is a schematic signal flow diagram of a bidirectional energy storage converter control device according to an embodiment of the present utility model.
Detailed Description
In order to make the present solution better understood by those skilled in the art, the technical solution in the present solution embodiment will be clearly described below with reference to the accompanying drawings in the present solution embodiment, and it is obvious that the described embodiment is an embodiment of a part of the present solution, but not all embodiments. All other embodiments, based on the embodiments in this solution, which a person of ordinary skill in the art would obtain without inventive faculty, shall fall within the scope of protection of this solution.
The term "comprising" in the description of the present solution and the claims and in the above-mentioned figures, as well as any other variants, means "including but not limited to", intended to cover a non-exclusive inclusion, and not limited to only the examples listed herein. Furthermore, the terms "first" and "second," etc. are used for distinguishing between different objects and not for describing a particular sequential order.
The implementation of the utility model is described in detail below with reference to the specific drawings:
fig. 1 is a schematic circuit diagram of a bidirectional energy storage converter control device according to an embodiment of the present utility model.
As shown in fig. 1: the utility model provides a control device of a bidirectional energy storage converter, which is used for controlling the bidirectional energy storage converter, and comprises an IGBT driving system, wherein the IGBT driving system comprises a first-stage IGBT driving module and a second-stage IGBT driving module which are connected through a capacitor pool, and the capacitor pool is used for temporarily storing electric energy;
the bidirectional energy storage converter control device comprises a signal acquisition circuit 1, a main control chip 2 and a PWM level conversion circuit 3;
the signal acquisition circuit 1 is connected with the main control chip 2, acquires voltage and current signals of the energy storage medium end, the power grid end and the grid connection point, and sends the acquired voltage and current signals to the main control chip 2;
The main control chip 2 generates an inversion control signal or a rectification control signal according to the collected voltage and current signals and sends the inversion control signal or the rectification control signal to the PWM level conversion circuit 3;
the PWM level conversion circuit 3 converts the inversion control signal or the rectification control signal into a PWM control signal, and charges the first-stage IGBT driving module and the second-stage IGBT driving module through the PWM control signal or performs variable current control in the grid-connected process.
In the embodiment, the signal acquisition circuit can acquire voltage and current of the energy storage medium end, the power grid end and the grid connection point, and sends the acquired voltage and current to the main control chip; the energy storage medium end is one end of the energy storage converter, which stores electric energy through a medium or equipment and releases the electric energy when needed, the power grid end is one end of the energy storage converter, which is mainly used for outputting electric power to a main network, and the grid connection point is a high-voltage side bus or node of a distributed power booster station for a distributed power supply with the booster station; for a distributed power supply without a booster station, the grid-connected point is an output summary point of the distributed power supply, and in the embodiment, the grid-connected point is each output summary point in the energy storage converter;
The main control chip can monitor the acquisition position in real time according to the received voltage and current information, and can send out an alarm signal when the current or voltage signal of the acquisition position is abnormal; on the other hand, the voltage and current information of each part of the energy storage converter system is used as input quantity, an inversion control signal or a rectification control signal is generated according to the change of the input quantity, and the inversion control signal or the rectification control signal is sent to the PWM level conversion circuit; when the PWM level conversion circuit receives an inversion control signal or a rectification control signal sent by the main control chip, the inversion control signal or the rectification control signal is converted into a PWM control signal, and the PWM control signal is used for controlling the first-stage IGBT driving module and the second-stage IGBT driving module to conduct conversion control in the charging or grid-connected process in real time, so that the energy storage converter system is coordinated and stably operated; in addition, the first-stage IGBT driving module and the second-stage IGBT driving module are connected through the capacitor pool, the capacitor pool can temporarily store electric energy, the controllable voltage change range of the system can be improved, the voltage change in the conversion process plays a role in buffering, and therefore the stability of the system is improved, and the safe and stable operation of the system is guaranteed.
In some possible embodiments, the PWM level conversion circuit in the bidirectional energy storage converter control device includes a first stage PWM level control module and a second stage PWM level control module;
in a grid-connected state, the first-stage PWM level control module controls the first-stage IGBT driving module through a rectification control signal to perform DC-DC conversion, and transfer of electric energy from an energy storage medium to a capacitor pool is completed; the second-stage PWM level control module controls the second-stage IGBT driving module through an inversion control signal to perform inversion treatment, and the transfer of electric energy from the capacitor pool to the power grid is completed;
during a charging state, the second-stage PWM level control module controls the second-stage IGBT driving module through a rectification control signal to carry out rectification conversion, so that the transfer of electric energy from a power grid to a capacitor pool is completed; the first-stage PWM level control module controls the first-stage IGBT driving module through the inversion control signal to perform DC-DC conversion, and transfer of electric energy from the capacitor pool to the energy storage medium is completed.
In the embodiment, the PWM level control circuit can perform hierarchical control on the IGBT bridge arm, and in the grid-connected state, the first PWM level control module controls the first IGBT driving module to perform conversion between direct current and direct current, so that the transfer of electric energy from the energy storage medium to the capacitor pool can be realized, and then the second PWM level control module controls the second IGBT driving module to perform inversion processing, so that the electric energy is transferred from the capacitor pool to the power grid, and the grid-connected process is realized;
During charging, the second-stage PWM level control module controls the second-stage IGBT driving module to carry out rectification conversion, and electric energy is transferred from the power grid to the capacitor pool; and then the first-stage PWM level control module controls the first-stage IGBT driving module to convert direct current into direct current, and the transfer of electric energy from the capacitor pool to the energy storage medium is completed, so that the charging process is realized.
Fig. 2 is a topology diagram of a bidirectional energy storage converter control device according to an embodiment of the present utility model.
In some possible embodiments, the bidirectional energy storage converter control device comprises a direct current side module and a grid side module;
the first-stage IGBT driving module is connected with the energy storage medium end through the direct-current side module to realize bidirectional DC-DC conversion;
the second-stage IGBT driving module is connected with a power grid end through a grid side module to realize bidirectional DC-AC conversion.
As shown in fig. 2: each IGBT driving module can comprise three IGBT bridge arms, and each IGBT bridge arm comprises an insulated gate field effect transistor and a bipolar transistor; the first-stage IGBT driving module comprises a first bridge arm, a second bridge arm and a third bridge arm; the second-stage IGBT driving module comprises a fourth bridge arm, a fifth bridge arm and a sixth bridge arm; the first bridge arm comprises an insulated gate field effect transistor K1A and a bipolar transistor K1B; the second bridge arm comprises an insulated gate field effect transistor K2A and a bipolar transistor K2B; the third bridge arm comprises an insulated gate field effect transistor K3A and a bipolar transistor K3B; the fourth bridge arm comprises an insulated gate field effect transistor K4A and a bipolar transistor K4B; the fifth bridge arm comprises an insulated gate field effect transistor K5A and a bipolar transistor K5B; the sixth bridge arm comprises an insulated gate field effect transistor K6A and a bipolar transistor K6B.
The direct current side module may include a direct current side EMI module and a direct current side LC filter module; the network side module may include a network side EMI module and a network side LC filter module; the EMI module can filter various interference signals and prevent high-frequency interference from a power grid formed by the power switch circuit; the LC filter module can carry out filtering and reactive compensation; the two-stage IGBT driving module is connected between the power grid and the energy storage medium, the end of the energy storage medium is connected with the first-stage IGBT driving module through the direct-current side EMI module and the direct-current side LC filter module, and when the first-stage IGBT driving module receives a control signal, the two-way DC-DC conversion is controlled; the power grid end is connected with the second-stage IGBT driving module through the grid-side EMI module and the grid-side LC filtering module, and when the second-stage IGBT driving module receives the control signal, the second-stage IGBT driving module can control bidirectional DC-AC conversion.
The capacitor pool is arranged between the first-stage IGBT driving module and the second-stage IGBT driving module, so that electric energy can be temporarily stored, the controllable voltage change range of the system is improved, the voltage change in the variable-current conversion process is buffered, and the stability of the system is improved.
Fig. 3 is a schematic diagram of an overall module structure of a bidirectional energy storage converter control device according to an embodiment of the present utility model.
In some possible embodiments, the signal acquisition circuit in the bidirectional energy storage converter control device comprises a first loop, a second loop and a third loop;
the first loop, the second loop and the third loop are connected in parallel;
the bidirectional energy storage converter control device also comprises a rectification conditioning circuit, a threshold alarming circuit, a phase locking circuit and a signal processing circuit;
a loop sends the voltage and current of the energy storage medium end to a rectification conditioning circuit;
the rectification conditioning circuit rectifies the voltage and the current of the energy storage medium end to obtain the maximum value of the rectified voltage and the rectified current, and sends the maximum value of the voltage and the maximum value of the rectified current to the threshold alarming circuit;
the threshold alarm circuit compares the maximum value of the voltage or the current with a preset alarm threshold, and when the maximum value of the voltage or the current is larger than or smaller than the preset alarm threshold, an alarm signal is sent to the main control chip;
the second loop sends the voltage and current of the power grid end to the phase-locked circuit; the phase-locked circuit sends the phase information of the voltage and the current of the power grid end to the main control chip;
the three loops send the voltage and current of the grid-connected point to the signal processing circuit; the signal processing circuit converts the voltage and current of the grid-connected point into a signal which can be identified by the main control chip and sends the signal to the main control chip.
In this embodiment, as shown in fig. 3, the signal acquisition circuit includes three loops connected in parallel; the method comprises the steps that signals collected by each loop and executed functions are different, wherein one loop is connected with a rectification conditioning circuit, the rectification conditioning circuit is connected with a threshold value alarm circuit, collected electric signals can be transmitted to the rectification conditioning circuit, the rectification conditioning circuit can rectify the electric signals collected by multiple phases and then take the maximum value, the obtained data are transmitted to the threshold value alarm circuit, the main element of the threshold value alarm circuit is a hysteresis comparator, and when the data received by the threshold value alarm circuit are higher than or lower than an alarm threshold value, an indicator lamp of the threshold value alarm circuit is turned on, and then an alarm signal is output to a main control chip;
the second loop is connected with the phase-locked circuit and can transmit the phase information of the acquired signals to the main control chip; the three loops are connected with the signal processing circuit, so that the collected signals can be processed into signals which can be identified by the main control chip, and the signals can be monitored in real time.
Fig. 4 is a voltage and current collection position diagram of a bidirectional energy storage converter control device according to an embodiment of the present utility model, as shown in fig. 4: vdc represents the direct current busbar voltage of the power grid end and the energy storage medium end in a loop, ib represents the charging or discharging current of the energy storage medium, idc-1, idc-2 and Idc-3 represent the direct current branch current, in the embodiment, the energy storage medium can improve the reliability of power supply of the power grid, when a power failure fault occurs, the energy storage medium end can supply reserved energy to an end user, the interruption of electric energy in the fault repairing process is avoided, and the reliability of power supply is ensured, so that the storage capacity and reliability of the energy storage end can be judged by detecting the voltage and current information of the power grid end and the energy storage end;
Fig. 5 is a diagram of a power grid side voltage and current collection position of a bidirectional energy storage converter control device according to an embodiment of the present utility model, as shown in fig. 5:
vg-ab, vg-bc and Vg-ac represent the inter-phase voltage of the power grid end in the second loop, ig-a, ig-b and Ig-c are inter-phase current of the power grid, in the embodiment, when the inter-phase fault occurs in the power grid, the inter-phase voltage of the fault becomes large instantly and then becomes small, and at the moment, the inter-phase current of the fault suddenly increases to impact other lines to cause short circuit, so that whether the inter-phase fault occurs in the power grid can be judged by detecting the change of the voltage or the current;
in the embodiment, the voltage rise of the grid-connected point not only affects the power supply quality of the power grid load, but also increases the loss of power transmission equipment such as a line, a transformer and the like, so that the voltage of the grid-connected point can be detected to ensure that the voltage of the grid-connected point is in a normal range, and when the voltage value is abnormal, technicians can be timely notified to maintain.
In some possible embodiments, the bidirectional energy storage converter control device may further include a temperature polling circuit;
the temperature acquisition circuit is connected with the temperature polling circuit, acquires temperature information and sends the temperature information to the temperature polling circuit;
The temperature polling circuit is connected with the main control chip and sends temperature information to the signal processing circuit when receiving a temperature inquiry instruction sent by the main control chip; the signal processing circuit converts the temperature information into a signal which can be identified by the main control chip and sends the signal to the main control chip.
As shown in fig. 3, the main control chip may be DSP28335, the signal acquisition circuit may also acquire a temperature signal, after completing temperature signal acquisition, the signal acquired may be transmitted to the temperature polling circuit, when the temperature polling circuit receives a query instruction sent by the main control chip, the temperature signal queried by the main control chip is transmitted to the signal processing circuit, the signal processing circuit converts the received temperature signal into a signal that can be identified by the main control chip, and the whole temperature acquisition circuit can realize real-time monitoring of temperature acquisition information.
In some possible embodiments, the bidirectional energy storage converter control device may further include a fault input circuit, an input isolation circuit, an output isolation circuit, and a switch control circuit;
the fault input circuit is connected with the input isolation circuit, generates a switching value control signal according to a fault signal at any position of the bidirectional energy storage converter control device, and sends the switching value control signal to the input isolation circuit;
The input isolation circuit converts the switching value control signal into a first voltage value matched with the main control chip and sends the first voltage value to the main control chip;
the main control chip is connected with the output isolation circuit and sends a switching value control signal to the output isolation circuit;
the output isolation circuit converts the switching value control signal into a second voltage value matched with the switching control circuit and sends the second voltage value to the switching control circuit;
and the switch control circuit controls the fault lamp or the control switch according to the second voltage value.
As shown in fig. 3, in the present embodiment, the fault input circuit can realize level conversion while realizing unidirectional transmission of signals; specifically, the fault input circuit can be connected with a communication interface in the bidirectional energy storage converter control device to monitor each point in the control device, when the current, the voltage or the temperature of the acquisition position fails, or a certain indicator lamp in the control device fails, or any part of the bidirectional energy storage converter fails, the fault input circuit can receive fault information, generate a fault signal, generate a switching value control signal according to the fault signal, and then transmit the switching value control signal to the main control chip; in a specific embodiment, if a 24V switching value control signal is input, the fault input circuit may convert it into a 5V switching value control signal; after the fault input circuit is connected with the input isolation circuit, the 5V switching value control signal can be converted into a 3V switching value control signal; the input isolation circuit is connected with the main control chip and can transmit fault information to the main control chip;
After receiving the fault signal, the main control chip generates a control signal and sends the control signal to the output isolation circuit, the output isolation circuit can convert the control signal into a voltage value matched with the switch control circuit, and then the switch control circuit is controlled to convert the switching value so as to enable the fault lamp or control the switch to be turned off.
In some possible embodiments, the fault input circuit in the bi-directional energy storage converter control device is an optocoupler isolation module;
the switch control circuit is a relay control module.
In the embodiment, the optocoupler isolation module can play an isolation role, and because the optocoupler is in unidirectional transmission, unidirectional transmission of signals can be realized, so that electrical isolation between an input end and an output end is completely realized, the output signal has no influence on the input end, the optocoupler isolation module has strong anti-interference capability and stable operation, and the optocoupler has long service life because of photoelectricity, and can get rid of the defect that a mechanical contact has the attraction times; on the other hand, the output mode of the optical coupler isolation module can play a role in level conversion, and the output signal of the optical coupler isolation module can be TTL level signal only by using 5VDC for a circuit power supply at the output end part of the optical coupler isolation module in the design process.
Therefore, the optical coupling isolation module is selected as the fault input circuit in the embodiment, so that the isolation function can be achieved, the influence of the output signal on the input signal is prevented, and the level conversion can be performed.
The relay control module is an automatic switching element with an isolation function, is provided with an induction element capable of reflecting an input variable, and can realize on or off of a controlled circuit; the input quantity can be coupled and isolated and functionally processed between the input part and the output part of the relay.
Therefore, the relay control module is selected as the switch control circuit in the embodiment, so that the input voltage can be detected, and the output quantity can be controlled.
In some possible embodiments, the bidirectional energy storage converter control device may further include a communication circuit;
the communication circuit is connected with the main control chip, and the main control chip is communicated with the upper computer through the communication circuit.
As shown in fig. 3, the communication circuit may include an RS485 communication circuit and a CAN communication circuit, where the main control chip may include an SCI function pin, and the main control chip is connected to the RS485 communication circuit through the SCI function pin to implement asynchronous serial communication; the main control chip CAN also comprise a CAN function pin, the main control chip is connected with a CAN communication circuit through the CAN function pin, serial communication is realized, the whole device CAN realize communication between the main control chip and an upper computer through an RS485 communication circuit and the CAN communication circuit, after a signal acquisition circuit sends acquired voltage or current signals to the main control chip, the main control chip CAN detect whether an acquisition position fails, and when the main control chip detects that the acquisition position fails, the main control chip CAN send the failure position to the upper computer through the communication circuit so that a worker CAN overhaul the failure position in time.
In some possible embodiments, the bidirectional energy storage converter control device may include a control backplane and a master control board;
the main control board comprises 2 base plate switching interfaces, wherein each base plate switching interface comprises DI and DO control connectors and an independent power supply interface;
the DI and DO control connectors are connected with the control bottom plate;
the independent power supply interface is used for independently supplying power to the main control board.
In the embodiment, the control device is divided into a control bottom plate and a main control board, and the control bottom plate is connected with the control main board through a DI/DO interface for connecting digital input and output cables so as to realize the interaction of input and output information; the main control board also comprises an independent power supply interface which can supply power for the main control board independently, so that the main control board is ensured to be in a working state all the time.
Fig. 6 is a diagram of a main control board PCB of a bidirectional energy storage converter control device according to an embodiment of the present utility model;
fig. 7 is a control chassis PCB distribution diagram of a bidirectional energy storage converter control device according to an embodiment of the present utility model.
In some possible embodiments, a main control board of the bidirectional energy storage converter control device may be provided with a power supply filtering module, a signal processing module, a communication module, an input power supply isolation module, an output power supply isolation module and a main control chip;
The power supply filtering module is used for filtering the electric signal of the external power supply and supplying power to the main control chip through the filtered electric signal;
the signal processing module is connected with the main control chip; the main control chip is connected with the communication module;
a power supply filtering module, a signal processing module, a PWM level conversion module, a sampling module, an optical coupler isolation module and a relay control module can be arranged on a control bottom plate of the bidirectional energy storage converter control device;
the power supply filtering module is used for filtering the electric signal of the external power supply and supplying power for the control bottom plate through the filtered electric signal;
the sampling module is connected with the signal processing module; the signal processing module is connected with a main control chip on the main control board; the master control chip is connected with the PWM level conversion module;
the optical coupling isolation module is connected with the main control chip through an input power isolation module on the main control board; the main control chip is connected with the relay control module through the output power isolation module.
As shown in fig. 6, in this embodiment, the main control board may be provided with a power filtering module, a signal processing module, a communication module, an input power isolation module, an output power isolation module and a main control chip, and may further include various interfaces, such as a JTAG download interface, a backplane interface, a communication interface and an independent power supply interface; the main control chip can be a DSP28335, the independent power supply interface can be externally connected with a 5V power supply, and the power supply filtering module can carry out filtering treatment on the externally connected 5V power supply and convert the external 5V power supply into 3.3V and 1.8V to supply power for the main control chip; the JTAG download interface can download the main control program; the base plate transfer interface can comprise a DIDO control connection port connected with a DI interface and a DO interface on the control base plate, and an ADC acquisition signal connection and power supply interface connected with a main control transfer interface on the control base plate, and can supply power through the control base plate; the signal processing module is connected with the main control chip and sends the processed signal to the main control chip; the main control chip sends the received signals to the communication module, and the communication between the main control chip and the upper computer is realized through the communication interface;
As shown in fig. 7, the control base plate is responsible for signal acquisition, signal processing and signal control, and may be provided with a power supply filtering module, a signal processing module, a PWM level conversion module, a sampling module, an optocoupler isolation module and a relay control module; the power supply filtering module on the control bottom plate can carry out filtering treatment on the power supply flowing to the control bottom plate through the power supply interface; the sampling module can collect current, voltage and temperature; correspondingly, the control bottom plate can comprise a voltage sampling interface, a current sampling interface and an NTC sampling interface, corresponding signal acquisition can be carried out through the sampling interfaces, the acquired signals are adjusted through sampling resistors, the signals are converted into signals which can be identified by a main control chip through a signal processing module and are sent to the main control chip, and after the main control chip receives the signals, a PWM level conversion module can be controlled through a PWM control port to control the bidirectional energy storage converter; the optical coupling isolation module is connected with the main control chip through an input power isolation module on the main control board; the main control chip is connected with the relay control module through the output power isolation module, so that the switching value signal control can be realized; all input signals on the main control board are processed by the control bottom board and converted into signals below 5V, except for the power supply and the bottom board conversion interface, the level signals on the main control board are below 3V, so that the interference of strong signals on the main control board can be greatly reduced, and the signal integrity is ensured.
Fig. 8 is a schematic signal flow diagram of a bidirectional energy storage converter control device according to an embodiment of the present utility model, as shown in fig. 8:
in a specific embodiment, the signal acquisition module can acquire multiphase current or voltage of the power grid end and the power source end, and the acquired information in the first aspect can transmit a phase signal to the main control chip DSP28335 through the zero-crossing phase lock; in the second aspect, the rectification conditioning circuit rectifies the electric signals collected by the multiple phases and then takes the maximum value, the obtained electric signals are transmitted to the threshold alarming circuit, namely the hysteresis comparator, and when the hysteresis comparator detects that the electric signals are abnormal, an alarming signal is sent to the main control chip DSP28335; the third aspect converts the acquired information into a signal which can be identified by a main control chip DSP28335 through a signal processing circuit so as to realize real-time monitoring of the acquired position information; the level control conversion circuit comprises a level conversion IC and PWM output, and the signal transmitted to the PWM level control conversion circuit by the main control chip is converted by the level conversion IC and then is controlled by the PWM output so as to control the IGBT bridge arm;
the fault input circuit can input fault signals such as overvoltage, overcurrent, scram and IGBT faults, the input fault signals can be converted into signals which can be identified by the main control chip through the isolation level, the main control chip can send out control instructions after receiving the fault signals, and the control instructions are converted into signals which can be identified by the fault lamp or the fault switch lamp through the isolation level so as to control the fault lamp or the fault switch to respond correspondingly;
The temperature polling circuit comprises a temperature sensor which can collect temperature information. The main control chip sends an inquiry command to the temperature polling circuit, the temperature polling circuit sends a signal to be inquired by the main control chip to the signal processing circuit, and the signal processing circuit processes the signal into a signal which can be identified by the main control chip so that the control device can monitor the temperature;
the main control chip is connected with the communication circuit, and the communication circuit comprises an RS485 communication circuit and a CAN communication circuit to jointly realize communication with the upper computer.
In summary, the embodiment of the utility model provides a bidirectional energy storage converter control device, which collects different signals through three collection loops of a signal collection circuit, wherein one loop is connected with a rectification signal and an alarm device, and can send an alarm signal to a main control chip; the second loop is connected with the phase-locked current, can transmit phase information to the main control chip, and the third loop is connected with the signal processing device, can process the collected signals into signals which can be identified by the main control chip, and can monitor the signals in real time; the main control chip transmits signals to the PWM level conversion circuit to control the IGBT driving module, wherein the IGBT driving module is divided into two stages, and the two stages comprise capacitor pools, so that electric energy can be temporarily stored, the controllable voltage change range of the system can be improved, the voltage change in the variable current conversion process can play a role in buffering, the stability of the system is improved, and the safe and stable operation of the system is ensured.
The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (10)
1. The control device for the bidirectional energy storage converter is characterized by being used for controlling the bidirectional energy storage converter, wherein the bidirectional energy storage converter comprises an IGBT driving system, the IGBT driving system comprises a first-stage IGBT driving module and a second-stage IGBT driving module which are connected through a capacitor pool, and the capacitor pool is used for temporarily storing electric energy;
the bidirectional energy storage converter control device comprises a signal acquisition circuit, a main control chip and a PWM level conversion circuit;
the signal acquisition circuit is connected with the main control chip, acquires voltage and current signals of an energy storage medium end, a power grid end and a grid connection point, and sends the voltage and current signals to the main control chip;
The main control chip generates an inversion control signal or a rectification control signal according to the voltage and current signal and sends the inversion control signal or the rectification control signal to the PWM level conversion circuit;
the PWM level conversion circuit converts the inversion control signal or the rectification control signal into a PWM control signal, and charges the first-stage IGBT driving module and the second-stage IGBT driving module through the PWM control signal or performs variable current control in a grid connection process.
2. The bi-directional energy storage converter control device of claim 1, wherein said PWM level shift circuit comprises a first stage PWM level control module and a second stage PWM level control module;
when in a grid-connected state, the first-stage PWM level control module controls the first-stage IGBT driving module through the rectification control signal to perform DC-DC conversion, and transfer of electric energy from an energy storage medium to a capacitor pool is completed; the second-stage PWM level control module controls the second-stage IGBT driving module through the inversion control signal to perform inversion treatment, and transfer of electric energy from the capacitor pool to the power grid is completed;
when in a charging state, the second-stage PWM level control module controls the second-stage IGBT driving module through the rectification control signal to carry out rectification conversion, so that the transfer of electric energy from a power grid to a capacitor pool is completed; and the first-stage PWM level control module controls the first-stage IGBT driving module through the inversion control signal to perform DC-DC conversion, so that the transfer of electric energy from the capacitor pool to the energy storage medium is completed.
3. The bi-directional energy storage converter control device of claim 1, wherein the bi-directional energy storage converter control device comprises a direct current side module and a grid side module;
the first-stage IGBT driving module is connected with the energy storage medium end through the direct-current side module to realize bidirectional DC-DC conversion;
and the second-stage IGBT driving module is connected with the power grid end through the network side module to realize bidirectional DC-AC conversion.
4. The bi-directional energy storage converter control device of claim 1, wherein said signal acquisition circuit comprises a first loop, a second loop and a third loop;
the first loop, the second loop and the third loop are connected in parallel;
the bidirectional energy storage converter control device also comprises a rectification conditioning circuit, a threshold alarming circuit, a phase locking circuit and a signal processing circuit;
the loop sends the voltage and current of the energy storage medium end to the rectification conditioning circuit;
the rectification conditioning circuit rectifies the voltage and current at the energy storage medium end to obtain the maximum value of the voltage and current, and sends the maximum value of the voltage and current to the threshold alarming circuit;
the threshold alarm circuit compares the maximum value of the voltage and the current with a preset alarm threshold, and sends an alarm signal to the main control chip when the maximum value of the voltage and the current is larger than or smaller than the preset alarm threshold;
The two loops send the voltage and the current of the power grid end to the phase-locked circuit; the phase-locked circuit sends the phase information of the voltage and the current of the power grid end to the main control chip;
the three loops send the voltage and current of the grid connection point to the signal processing circuit; the signal processing circuit converts the voltage and current of the point of connection into a signal which can be identified by the main control chip and sends the signal to the main control chip.
5. The bi-directional energy storage converter control device of claim 1, further comprising a temperature polling circuit, said signal acquisition circuit further comprising a temperature acquisition circuit;
the temperature acquisition circuit is connected with the temperature polling circuit, acquires temperature information and sends the temperature information to the temperature polling circuit;
the temperature polling circuit is connected with the main control chip, and when receiving a temperature inquiry instruction sent by the main control chip, the temperature polling circuit sends the temperature information to the signal processing circuit; the signal processing circuit converts the temperature information into a signal which can be identified by the main control chip and sends the signal to the main control chip.
6. The bi-directional energy storage converter control device of claim 1, further comprising a fault input circuit, an input isolation circuit, an output isolation circuit, and a switch control circuit;
the fault input circuit is connected with the input isolation circuit, generates a switching value control signal according to a fault signal at any position of the bidirectional energy storage converter control device, and sends the switching value control signal to the input isolation circuit;
the input isolation circuit converts the switching value control signal into a first voltage value matched with the main control chip and sends the first voltage value to the main control chip;
the main control chip is connected with the output isolation circuit and sends a switching value control signal to the output isolation circuit;
the output isolation circuit converts the switching value control signal into a second voltage value matched with the switching control circuit and sends the second voltage value to the switching control circuit;
the switch control circuit controls the fault lamp or the control switch according to the second voltage value.
7. A bi-directional energy storage converter control unit according to claim 6, wherein,
the fault input circuit is an optical coupling isolation module;
the switch control circuit is a relay control module.
8. The bi-directional energy storage converter control device of claim 1, further comprising a communication circuit;
the communication circuit is connected with the main control chip, and the main control chip is communicated with the upper computer through the communication circuit.
9. The bi-directional energy storage converter control device of claim 1, further comprising a control backplane and a master control board;
the main control board comprises 2 base plate transfer interfaces, wherein the base plate transfer interfaces comprise DI and DO control connectors and independent power supply interfaces;
the DI and DO control connectors are connected with the control bottom plate;
the independent power supply interface is used for independently supplying power to the main control board.
10. The control device of the bidirectional energy storage converter of claim 9, wherein the main control board is provided with a power supply filtering module, a signal processing module, a communication module, an input power supply isolation module, an output power supply isolation module and a main control chip; the power supply filtering module is used for filtering the electric signal of the external power supply and supplying power to the main control chip through the filtered electric signal;
The signal processing module is connected with the main control chip;
the main control chip is connected with the communication module;
the control bottom plate is provided with a power supply filtering module, a signal processing module, a PWM level conversion module, a sampling module, an optical coupling isolation module and a relay control module;
the power supply filtering module is used for filtering an electric signal of an external power supply and supplying power to the control bottom plate through the filtered electric signal;
the sampling module is connected with the signal processing module; the signal processing module is connected with the main control chip on the main control board; the main control chip is connected with the PWM level conversion module;
the optical coupling isolation module is connected with the main control chip through an input power isolation module on the main control board; and the main control chip is connected with the relay control module through the output power isolation module.
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| CN202320177599.0U CN219592126U (en) | 2023-02-10 | 2023-02-10 | Bidirectional energy storage converter control device |
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| CN202320177599.0U CN219592126U (en) | 2023-02-10 | 2023-02-10 | Bidirectional energy storage converter control device |
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