CN211296207U - Control device for parallel connection of generator set and inverter - Google Patents
Control device for parallel connection of generator set and inverter Download PDFInfo
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- CN211296207U CN211296207U CN201922474260.3U CN201922474260U CN211296207U CN 211296207 U CN211296207 U CN 211296207U CN 201922474260 U CN201922474260 U CN 201922474260U CN 211296207 U CN211296207 U CN 211296207U
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Abstract
The utility model provides a control device for parallel connection of a generator set and an inverter, which comprises a main controller, a grid-connected/off-grid switch, a communication module, a measuring module and a control module; the measuring module is connected with the control module and the output circuits of the generator set and the inverter power supply; the control module is connected with the main controller through the communication module; the main controller is used for sending a control instruction for controlling the generator set to start and a control instruction for setting the generator set to work in a constant power mode to the control module when the inverter power supply is detected to be insufficient in energy storage; and the frequency and voltage of the generator set are synchronous with the inverter power supply, and then a control instruction for controlling the grid-connected/off-grid switch to switch on the generator set, a control instruction for setting the generator set to work in an island mode and a control instruction for setting the inverter power supply to work in a current mode are sent to the control module.
Description
Technical Field
The utility model belongs to generator control field, specific theory has related to a parallelly connected controlling means of generating set and invertion power supply.
Background
When the storage battery energy storage system is used as a main power supply in an independent power system, the energy storage grid-connected inverter works in an independent operation mode to control the amplitude and the frequency of the outlet side alternating current bus voltage to be constant. The control mode is different from that of a diesel generator essentially, and an energy storage system is limited by power electronic devices in an inverter and generally does not have short-term overcurrent capacity. When the generator set and the energy storage grid-connected inverter operate in parallel, if the energy storage grid-connected inverter still works in an independent operation mode, the disturbance of net load in an independent power system is easy to cause the voltage of the ports of the generator set and the energy storage grid-connected inverter to deviate, and the equivalent impedance between the energy storage inverter and the synchronous generator is small, so that a large reactive circulation current can be generated due to the small voltage deviation, the overcurrent protection action of the energy storage inverter is easy to cause, the net power is completely transferred to a diesel engine, and further, the chain reaction and the system breakdown are easy to cause. Therefore, when the main power supply in the independent power system is converted from the energy storage system to the diesel engine or from the diesel engine to the energy storage system, the main power supply is usually turned off first, and then the diesel generator or the energy storage system is restarted, so that the system recovers power supply. In the process of switching the double main power supplies, a short-time power failure exists in the system, so that the load cannot be continuously supplied with power.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the not enough of prior art to a generating set and parallelly connected controlling means of invertion power supply are provided.
In order to realize the purpose, the utility model discloses the technical scheme who adopts is:
the utility model provides a control device for parallel connection of a generator set and an inverter, which is used for connecting the generator set and the inverter to an AC bus in parallel and comprises a main controller, an on/off-grid switch, a communication module, a measurement module and a control module;
the measuring module is connected with the control module and the output lines of the generator set and the inverter power supply and is used for detecting the voltage and the current on the output lines of the generator set and the inverter power supply, converting the current signal into a voltage signal which can be processed by the control module, converting the voltage signal from an analog quantity into a digital quantity and transmitting the digital quantity to the control module;
the control module is connected with the main controller through the communication module and is used for transmitting the acquired state information of the on-grid/off-grid switch and the digital quantity processed by the on-grid/off-grid switch to the main controller through the communication module, receiving a control instruction transmitted by the main controller through the communication module and executing the control instruction;
the main controller is used for sending a control instruction for controlling the starting of the generator set and a control instruction for setting the generator set to work in a constant power mode to the control module when the insufficient energy storage of the inverter power supply is detected and the starting condition of the generator set is met;
and the frequency and voltage of the generator set are synchronous with the inverter power supply, and then a control instruction for controlling the grid-connected/off-grid switch to switch on the generator set, a control instruction for setting the generator set to work in an island mode and a control instruction for setting the inverter power supply to work in a current mode are sent to the control module.
Based on the above, the main controller is further configured to send a control instruction for setting the generator set to operate in a constant power mode and a control instruction for setting the inverter power supply to operate in a voltage mode to the control module when it is detected that the energy storage condition of the inverter power supplies after being connected in parallel meets the shutdown condition of the generator set;
and the control module is also used for sending a control instruction for controlling the grid-connected/off-grid switch to open the generator set and a control instruction for controlling the generator set to stop after the generator set is unloaded.
Based on the above, the main controller is further configured to directly send a control instruction for controlling the grid-connected/disconnected switch to open or close the inverter power supply to the control module when the generator set and the inverter power supply operate in parallel.
Based on the above, the control module is a DSP control processing module; and the DSP control processing module is used for carrying out frequency measurement and active power calculation on the received digital quantity, and carrying out on-off switch switching control, generator set working mode control and inverter power supply working mode control on a grid-connected/off-grid switch.
Based on the above, the measurement module comprises a mutual inductor board and an AD sampling module connected with the mutual inductor board;
the transformer board is connected with the generator set and an output line of the inverter power supply, and the AD sampling module is connected with the control module;
the transformer board is used for detecting voltage and current on output lines of the generator set and the inverter power supply, converting a current signal into a voltage signal which can be processed by the control module and transmitting the voltage signal to the AD sampling module;
the AD sampling module is used for converting the voltage signal received from the mutual inductor plate from analog quantity to digital quantity and transmitting the digital quantity to the control module.
Based on the above, the communication module is a CAN bus communication module.
Based on the above, the DSP control processing module includes a DSPIC33FJ64GS606 chip.
Based on the above, the main controller adopts a 32-bit ARM single chip microcomputer.
The utility model discloses relative prior art has substantive characteristics and progress, specific theory, the utility model discloses a control generating set nimble conversion and inverter between isolated island mode and constant power mode nimble conversion between voltage mode and current mode for can not break off at two main power source switching in-process powers, realized the continuous power supply to the load.
Drawings
Fig. 1 is a schematic structural block diagram of the present invention.
Detailed Description
The technical solution of the present invention will be described in further detail through the following embodiments.
As shown in fig. 1, a control device for parallel connection of a generator set and an inverter power supply is used for connecting the generator set and the inverter power supply to an alternating current bus in parallel, and comprises a main controller, an on/off-grid switch, a communication module, a measurement module and a control module;
the measuring module is connected with the control module and the output lines of the generator set and the inverter power supply and is used for detecting the voltage and the current on the output lines of the generator set and the inverter power supply, converting the current signal into a voltage signal which can be processed by the control module, converting the voltage signal from an analog quantity into a digital quantity and transmitting the digital quantity to the control module;
the control module is connected with the main controller through the communication module and is used for transmitting the acquired state information of the on-grid/off-grid switch and the digital quantity processed by the on-grid/off-grid switch to the main controller through the communication module, receiving a control instruction transmitted by the main controller through the communication module and executing the control instruction. It should be noted that: how to execute the control instruction by the control module, so that the generator set works in an island mode and a constant power mode, and the inverter power supply works in a voltage mode and a current mode, is common knowledge for those skilled in the art, and is not described herein again.
The main controller is used for sending a control instruction for controlling the starting of the generator set and a control instruction for setting the generator set to work in a constant power mode to the control module when the insufficient energy storage of the inverter power supply is detected and the starting condition of the generator set is met;
and the frequency and voltage of the generator set are synchronous with the inverter power supply, and then a control instruction for controlling the grid-connected/off-grid switch to switch on the generator set, a control instruction for setting the generator set to work in an island mode and a control instruction for setting the inverter power supply to work in a current mode are sent to the control module.
Further, the main controller is further configured to send a control instruction for setting the generator set to operate in a constant power mode and a control instruction for setting the inverter power supply to operate in a voltage mode to the control module when it is detected that the energy storage condition of the inverter power supplies after parallel connection meets a generator set shutdown condition;
and the control module is also used for sending a control instruction for controlling the grid-connected/off-grid switch to open the generator set and a control instruction for controlling the generator set to stop after the generator set is unloaded.
And the control module is also used for directly sending a control instruction for controlling the on/off-grid switch to open or close the inverter power supply when the generator set and the inverter power supply run in parallel.
Specifically, the control module is a DSP control processing module; and the DSP control processing module is used for carrying out frequency measurement and active power calculation on the received digital quantity, and carrying out on-off switch switching control, generator set working mode control and inverter power supply working mode control on a grid-connected/off-grid switch.
Specifically, the measurement module comprises a mutual inductor plate and an AD sampling module connected with the mutual inductor plate; the transformer board is connected with the generator set and an output line of the inverter power supply, and the AD sampling module is connected with the control module; the transformer board is used for detecting voltage and current on output lines of the generator set and the inverter power supply, converting a current signal into a voltage signal which can be processed by the control module and transmitting the voltage signal to the AD sampling module; the AD sampling module is used for converting the voltage signal received from the mutual inductor plate from analog quantity to digital quantity and transmitting the digital quantity to the control module.
Specifically, the communication module is a CAN bus communication module, and the main controller and the control module are connected through a CAN bus, so that distributed control or real-time control CAN be effectively supported.
Specifically, the DSP control processing module comprises a DSPIC33FJ64GS606 chip, and the control module can effectively judge the control instruction of the main controller, so that the running stability of the device is improved.
Specifically, the main controller adopts a 32-bit ARM single chip microcomputer.
The utility model discloses in the use of device, the power can not break off, can realize supplying power in succession to the load.
Use the utility model discloses the method of being connected to alternating current bus with generating set and invertion power supply parallel includes following step:
step 1, enabling an inverter to work in a voltage mode with load;
step 2, when the insufficient energy storage of the inverter power supply is detected and the starting condition of the generator set is met, controlling the generator set to start, and juxtaposing the generator set to work in a constant power mode, so that the generator set can use the inverter power supply as commercial power;
step 3, synchronizing the power generation of the generator set and the inverter power supply by controlling the frequency and the voltage of the generator set;
step 4, after the synchronous condition is met, controlling a grid-connected/off-grid switch to switch on the generator set, enabling the generator set to work in an island mode, and enabling the inverter power supply to work in a current mode at the same time to complete parallel connection;
step 5, after parallel connection, simultaneously detecting the power of the generator set and the inverter power supply, and ensuring that the load power of the generator set is not less than the minimum load power by changing the power of the inverter power supply; when the energy storage condition meets the shutdown condition of the generator set, changing the working mode of the generator set into a constant power mode, simultaneously enabling the inverter power supply to work in a voltage mode, and gradually unloading the generator set (soft unloading process); and when the generator set is unloaded, the grid-connected/off-grid switch opens the generator set and stops, and the load is completely borne by the inverter power supply. When the generator set and the inverter power supply run in parallel, the switching-off and the switching-on of the inverter power supply are controlled through direct switching-off and switching-on operations, and the power supply to a load is not influenced.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (8)
1. A control device for parallel connection of a generator set and an inverter is used for connecting the generator set and the inverter to an alternating current bus in parallel, and is characterized in that: the system comprises a main controller, an on-grid/off-grid switch, a communication module, a measurement module and a control module;
the measuring module is connected with the control module and the output lines of the generator set and the inverter power supply and is used for detecting the voltage and the current on the output lines of the generator set and the inverter power supply, converting the current signal into a voltage signal which can be processed by the control module, converting the voltage signal from an analog quantity into a digital quantity and transmitting the digital quantity to the control module;
the control module is connected with the main controller through the communication module and is used for transmitting the acquired state information of the on-grid/off-grid switch and the digital quantity processed by the on-grid/off-grid switch to the main controller through the communication module, receiving a control instruction transmitted by the main controller through the communication module and executing the control instruction;
the main controller is used for sending a control instruction for controlling the starting of the generator set and a control instruction for setting the generator set to work in a constant power mode to the control module when the insufficient energy storage of the inverter power supply is detected and the starting condition of the generator set is met;
and the frequency and voltage of the generator set are synchronous with the inverter power supply, and then a control instruction for controlling the grid-connected/off-grid switch to switch on the generator set, a control instruction for setting the generator set to work in an island mode and a control instruction for setting the inverter power supply to work in a current mode are sent to the control module.
2. The control device for the parallel connection of the generator set and the inverter power supply according to claim 1 is characterized in that: the main controller is further used for sending a control instruction for setting the generator set to work in a constant power mode and a control instruction for setting the inverter power supply to work in a voltage mode to the control module when the energy storage condition of the inverter power supplies after parallel connection is detected to meet the stop condition of the generator set;
and the control module is also used for sending a control instruction for controlling the grid-connected/off-grid switch to open the generator set and a control instruction for controlling the generator set to stop after the generator set is unloaded.
3. The control device for the parallel connection of the generator set and the inverter power supply according to claim 1, wherein the main controller is further configured to directly send a control instruction for controlling the on/off switch to open or close the inverter power supply to the control module when the generator set and the inverter power supply operate in parallel.
4. The control device for the parallel connection of the generator set and the inverter power supply according to claim 1 is characterized in that: the control module is a DSP control processing module; and the DSP control processing module is used for carrying out frequency measurement and active power calculation on the received digital quantity, and carrying out on-off switch switching control, generator set working mode control and inverter power supply working mode control on a grid-connected/off-grid switch.
5. The control device for the parallel connection of the generator set and the inverter power supply according to claim 1 is characterized in that: the measurement module comprises a mutual inductor plate and an AD sampling module connected with the mutual inductor plate;
the transformer board is connected with the generator set and an output line of the inverter power supply, and the AD sampling module is connected with the control module;
the transformer board is used for detecting voltage and current on output lines of the generator set and the inverter power supply, converting a current signal into a voltage signal which can be processed by the control module and transmitting the voltage signal to the AD sampling module;
the AD sampling module is used for converting the voltage signal received from the mutual inductor plate from analog quantity to digital quantity and transmitting the digital quantity to the control module.
6. The control device for the parallel connection of the generator set and the inverter power supply according to claim 1 is characterized in that: the communication module is a CAN bus communication module.
7. The control device for the parallel connection of the generator set and the inverter power supply according to claim 4 is characterized in that: the DSP control processing module comprises a DSPIC33FJ64GS606 chip.
8. The control device for the parallel connection of the generator set and the inverter power supply according to claim 1 is characterized in that: the main controller adopts a 32-bit ARM single chip microcomputer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922474260.3U CN211296207U (en) | 2019-12-31 | 2019-12-31 | Control device for parallel connection of generator set and inverter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922474260.3U CN211296207U (en) | 2019-12-31 | 2019-12-31 | Control device for parallel connection of generator set and inverter |
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| CN211296207U true CN211296207U (en) | 2020-08-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113890397A (en) * | 2021-11-05 | 2022-01-04 | 中国船舶重工集团公司第七0四研究所 | Auxiliary grid-connected device of inverter power supply under low-voltage power supply network |
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2019
- 2019-12-31 CN CN201922474260.3U patent/CN211296207U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113890397A (en) * | 2021-11-05 | 2022-01-04 | 中国船舶重工集团公司第七0四研究所 | Auxiliary grid-connected device of inverter power supply under low-voltage power supply network |
| CN113890397B (en) * | 2021-11-05 | 2023-12-01 | 中国船舶重工集团公司第七0四研究所 | Inverter power auxiliary grid-connected device under low-voltage power supply network |
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