A ring carrier synchronization network and a carrier synchronization method

Abstract

The present invention provides a ring carrier synchronization network and a carrier synchronization method, wherein the ring carrier synchronization network includes a plurality of energy storage converters, the energy storage converter is used to control the corresponding battery output power supply signal based on the carrier signal, the energy storage converter has a signal output end and a signal receiving end, and the signal output end of the energy storage converter is connected to the signal receiving end of the downstream energy storage converter, the energy storage converter is used to periodically count the number of periodic cycles of the corresponding carrier signal, and send a synchronization signal to the downstream energy storage converter through the signal output end at the end of each counting cycle; and is also used to synchronize when receiving the synchronization signal of the upstream energy storage converter, so that the carrier signal corresponding to the energy storage converter is synchronized with the carrier signal corresponding to the upstream energy storage converter, send a synchronization signal to the downstream energy storage converter, and end the current counting cycle in advance. The ring carrier synchronization network provided by the present invention has low hardware cost and high stability.

Description

Technical Field

[0001] The present invention relates to the field of new energy, and in particular to a ring carrier synchronization network and a carrier synchronization method. Background Art

[0002] With the extensive application of energy storage systems, the power of single energy storage systems continues to increase, and the power of energy storage converters also increases accordingly. Due to the limitation of single energy storage converter power, modular parallel connection becomes a trend. When two or more energy storage converters are connected in parallel, high-frequency circulating currents will be generated between converters, and complex common-mode interference will also be generated. These are all unfavorable factors that affect the stable operation of the system. Carrier synchronization can effectively solve the above problems.

[0003] There are two common methods for achieving carrier synchronization in existing energy storage solutions. One is to use a master-slave-based carrier synchronization technology, that is, to synchronize the carriers of other converters at a fixed phase point through a master controller, and the other is to use a master-slave-free CAN communication method for carrier synchronization. However, in the master-slave-based carrier synchronization technology, when the master controller fails or a single-point line fails, the system will not operate normally; when the master-slave-free CAN communication method is used for carrier synchronization, the accuracy is insufficient because the CAN communication time and software response time cannot be accurately calculated.

[0004] Therefore, how to provide a carrier synchronization system for an energy storage converter that can ensure carrier synchronization stability has become a technical problem that needs to be urgently solved in this field. Summary of the invention

[0005] The present invention aims to provide a ring carrier synchronization network and a carrier synchronization method. The ring carrier synchronization network has low hardware cost and high stability.

[0006] To achieve the above-mentioned purpose, as one aspect of the present invention, a ring carrier synchronous network is provided, the ring carrier synchronous network comprising a plurality of energy storage inverters, the energy storage inverters being used to control the corresponding battery output power supply signal based on a carrier signal, the energy storage inverter having a signal output end and a signal receiving end, and the signal output end of the energy storage inverter is connected to the signal receiving end of the downstream energy storage inverter, and the signal receiving end of the energy storage inverter is connected to the signal output end of the upstream energy storage inverter, so that the plurality of energy storage inverters are interconnected to form the ring carrier synchronous network;

[0007] The energy storage inverter is used to periodically count the number of periodic cycles of the corresponding carrier signal, and send a synchronization signal to the downstream energy storage inverter through the signal output end at the end of each counting cycle; it is also used to synchronize based on the synchronization signal when the synchronization signal of the upstream energy storage inverter is received at the signal receiving end, so that the carrier signal corresponding to the energy storage inverter is synchronized with the carrier signal corresponding to the upstream energy storage inverter, send the synchronization signal to the downstream energy storage inverter, and end the current counting cycle in advance.

[0008] Optionally, the energy storage converter includes a digital signal processing module and a signal transceiver module, wherein the digital signal processing module is used to control the corresponding battery output power supply signal based on the carrier signal, and is also used to synchronize based on the synchronization signal when receiving the synchronization signal;

[0009] The signal transceiver module is used to periodically count the number of periodic cycles of the corresponding carrier signal, and send a synchronization signal to the signal transceiver module of the downstream energy storage inverter through the signal output end at the end of each counting cycle; it is also used to send the synchronization signal to the corresponding digital signal processing module when the synchronization signal sent by the upstream signal transceiver module is received through the signal receiving end, and end the current counting cycle in advance.

[0010] Optionally, the signal transceiver module is specifically used to count the number of periodic cycles of the corresponding carrier signal in each counting cycle to obtain a first counting value, and determine that the counting cycle ends when the first counting value reaches a first pre-designed value; the early termination of the current counting cycle is specifically to clear the first counting value to zero.

[0011] Optionally, the signal transceiver module is further used to count the number of period cycles of the corresponding carrier signal each time the synchronization signal is received to obtain a second count value;

[0012] The signal transceiver module is further used to compare the second count value with a second pre-designed value when receiving the synchronization signal sent by the upstream signal transceiver module; if the second count value is greater than the second pre-designed value, the synchronization signal is sent to the corresponding digital signal processing module and the current counting cycle is terminated in advance; if the second count value is not greater than the second pre-designed value, the current counting cycle is continued;

[0013] The second pre-designed value is smaller than the first pre-designed value.

[0014] Optionally, the signal transceiver module is further used to count the number of period cycles of the corresponding carrier signal after sending the synchronization signal each time, so as to obtain a third count value;

[0015] The signal transceiver module is also used to compare the second count value and the third count value with a second pre-designed value when receiving the synchronization signal sent by the upstream signal transceiver module. If the second count value and the third count value are both greater than the second pre-designed value, the synchronization signal is sent to the corresponding digital signal processing module and the current counting cycle is terminated in advance; if at least one of the second count value and the third count value is not greater than the second pre-designed value, the current counting cycle is continued.

[0016] Optionally, the second preset count value is the first pre-designed value minus 1.

[0017] Optionally, the carrier signal is a triangular signal, and the carrier signal is at a trough at the beginning of each counting cycle, and the first count value is the number of times the carrier signal reaches the trough after the beginning of the counting cycle.

[0018] Optionally, the signal transceiver module is a field programmable logic gate array circuit.

[0019] As a second aspect of the present invention, a carrier synchronization method is provided, the carrier synchronization method is applied to the energy storage converter in the aforementioned ring carrier synchronization network, the carrier synchronization method comprising:

[0020] Periodically counting the number of cycles of the corresponding carrier signal, and sending a synchronization signal to the downstream energy storage converter at the end of each counting cycle; and,

[0021] When the synchronization signal of the upstream energy storage converter is received, synchronization is performed based on the synchronization signal, so that the carrier signal is synchronized with the carrier signal corresponding to the upstream energy storage converter, the synchronization signal is sent to the downstream energy storage converter, and the current counting cycle is ended in advance.

[0022] Optionally, the carrier synchronization method further comprises counting the number of periodic cycles of the carrier signal after receiving the synchronization signal each time to obtain a second count value;

[0023] and when receiving the synchronization signal sent by the upstream signal transceiver module, comparing the second count value with a second pre-designed value, if the second count value is greater than the second pre-designed value, sending the synchronization signal to the corresponding digital signal processing module, and ending the current counting cycle in advance; if the second count value is not greater than the second pre-designed value, continuing the current counting cycle;

[0024] The second pre-designed value is smaller than the first pre-designed value.

[0025] In the ring carrier synchronous network provided by the present invention, the energy storage inverter has a single transceiver function, and the energy storage inverter can periodically count the number of periodic cycles of its carrier signal. When the carrier signals of multiple energy storage inverters are not synchronized, the energy storage inverter that first ends the counting cycle sends a synchronization signal to the downstream energy storage inverter, so that the carrier signal of the downstream energy storage inverter is synchronized with its carrier signal. The downstream energy storage inverter ends the current counting cycle in advance and sends a synchronization signal to the downstream energy storage inverter to synchronize it, finally realizing the carrier synchronization between all energy storage inverters in the ring carrier synchronous network.

[0026] The energy storage converter in the ring carrier synchronous network provided by the present invention only needs to be connected to the adjacent energy storage converters on both sides, so that the synchronization signal can be transmitted unidirectionally to each energy storage converter along the ring carrier synchronous network, completing the carrier synchronization of the entire ring carrier synchronous network, and reducing the hardware cost of the ring carrier synchronous network. In addition, when an energy storage converter in the ring carrier synchronous network fails or a single-point carrier synchronization line fails, although the ring carrier synchronous network is disconnected at the fault location, the remaining normal energy storage converters can still form a link for unidirectional transmission of synchronization signals, and the energy storage converter at the most upstream end sends the initial synchronization signal at the end of each counting cycle, and the carrier synchronization between all normal energy storage converters in the ring carrier synchronous network is continued to be maintained in the presence of a faulty device or line, thereby improving the stability of the ring carrier synchronous network. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 is a schematic diagram of the structure of a ring carrier synchronization network provided by an embodiment of the present invention;

[0029] Figure 2 is a schematic diagram of the structure of a ring carrier synchronization network provided by another embodiment of the present invention;

[0030] Figure 3 It is a structural schematic diagram of an energy storage converter in a ring carrier synchronous network provided by an embodiment of the present invention;

[0031] Figure 4 It is a timing diagram of the carrier signals of multiple energy storage converters in the synchronization process in the ring carrier synchronization network provided by an embodiment of the present invention;

[0032] Figure 5 It is a timing diagram of the carrier signals of multiple energy storage converters in the synchronization process in the ring carrier synchronization network provided by an embodiment of the present invention;

[0033] Figure 6 It is a flowchart of a carrier synchronization method provided by an embodiment of the present invention;

[0034] Figure 7 is a flow chart of a carrier synchronization method provided by another embodiment of the present invention;

[0035] Figure 8 It is a flowchart of a carrier synchronization method provided by another embodiment of the present invention.

[0036] Description of reference numerals:

[0037] 10: Digital signal processing module

[0038] 20: Signal transceiver module DETAILED DESCRIPTION

[0039] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0040] To solve the above technical problems, as one aspect of the present invention, a ring carrier synchronization network is provided, such as Figure 1 , Figure 2 As shown, the annular carrier synchronous network includes a plurality of energy storage converters (Power Conversion System, PCS), the energy storage converter is used to control the corresponding battery output power supply signal based on the carrier signal, the energy storage converter has a signal output terminal TX and a signal receiving terminal RX, and the signal output terminal TX of the energy storage converter is connected to the signal receiving terminal RX of the downstream energy storage converter, and the signal receiving terminal RX of the energy storage converter is connected to the signal output terminal TX of the upstream energy storage converter, so that the plurality of energy storage converters are interconnected to form the annular carrier synchronous network;

[0041] The energy storage inverter is used to periodically count the number of periodic cycles of the corresponding carrier signal, and send a synchronization signal to the downstream energy storage inverter through the signal output terminal TX at the end of each counting cycle; it is also used to synchronize based on the synchronization signal when the signal receiving terminal RX receives the synchronization signal of the upstream energy storage inverter, so that the carrier signal corresponding to the energy storage inverter is synchronized with the carrier signal corresponding to the upstream energy storage inverter, send the synchronization signal to the downstream energy storage inverter, and end the current counting cycle in advance.

[0042] It should be noted that the carrier signal is a periodically cyclic signal, and the energy storage converter (Power Conversion System, PCS) can determine the frequency and phase of the power supply signal based on the carrier signal, and determine the pulse width of the power supply signal in combination with relevant preset parameters, and finally determine the waveform of the power supply signal. When the carrier signal of the energy storage converter is synchronized with the carrier signal of the upstream energy storage converter (that is, when the phases are consistent), the power supply signal output by the corresponding battery it controls is also synchronized with the power supply signal output by the corresponding battery of the upstream energy storage converter, thereby achieving carrier synchronization and eliminating circulating current and common mode interference between converters.

[0043] In the ring carrier synchronous network provided by the present invention, the energy storage inverter (PCS) has a single transceiver function, and the energy storage inverter can periodically count the number of periodic cycles of its carrier signal. When the carrier signals of multiple energy storage inverters are not synchronized, the energy storage inverter that first ends the counting cycle sends a synchronization signal to the downstream energy storage inverter, so that the carrier signal of the downstream energy storage inverter is synchronized with its carrier signal. The downstream energy storage inverter ends the current counting cycle in advance and sends a synchronization signal to the downstream energy storage inverter to synchronize it, finally realizing the carrier synchronization between all energy storage inverters in the ring carrier synchronous network.

[0044] The energy storage converter in the ring carrier synchronous network provided by the present invention only needs to be connected to the adjacent energy storage converters on both sides, so that the synchronization signal can be transmitted unidirectionally to each energy storage converter along the ring carrier synchronous network, completing the carrier synchronization of the entire ring carrier synchronous network, and reducing the hardware cost of the ring carrier synchronous network. In addition, when an energy storage converter in the ring carrier synchronous network fails or a single-point carrier synchronization line fails, although the ring carrier synchronous network is disconnected at the fault location, the remaining normal energy storage converters can still form a link for unidirectional transmission of synchronization signals, and the energy storage converter at the most upstream end sends the initial synchronization signal at the end of each counting cycle, and the carrier synchronization between all normal energy storage converters in the ring carrier synchronous network is continued to be maintained in the presence of a faulty device or line, thereby improving the stability of the ring carrier synchronous network.

[0045] As an optional embodiment of the present invention, Figure 3 As shown, the energy storage converter includes a digital signal processing (DSP) module 10 and a signal transceiver module 20, wherein the digital signal processing module 10 is used to control the corresponding battery output power supply signal based on the carrier signal, and is also used to synchronize based on the synchronization signal when receiving the synchronization signal;

[0046] The signal transceiver module 20 is used to periodically count the number of periodic cycles of the corresponding carrier signal, and send a synchronization signal to the signal transceiver module 20 of the downstream energy storage inverter through the signal output terminal TX at the end of each counting cycle; it is also used to send the synchronization signal to the corresponding digital signal processing module 10 when the synchronization signal sent by the upstream signal transceiver module 20 is received through the signal receiving terminal RX, and end the current counting cycle in advance.

[0047] That is, in an embodiment of the present invention, the signal interaction between different energy storage converters (PCS) is handled by the signal transceiver module 20, and the digital signal processing (DSP) module 10 only needs to synchronize when receiving the synchronization signal forwarded by the signal transceiver module 20, thereby simplifying the functions that the digital signal processing module 10 needs to implement, thereby improving the operating efficiency of the energy storage converter.

[0048] As an optional embodiment of the present invention, the signal transceiver module 20 is specifically used to count the number of periodic cycles of the corresponding carrier signal in each counting cycle to obtain a first counting value, and determine that the counting cycle ends when the first counting value reaches a first pre-designed value n; the early termination of the current counting cycle is specifically to clear the first counting value to zero.

[0049] As an optional implementation of the present invention, the signal transceiver module 20 is a field programmable gate array (FPGA) circuit.

[0050] like Figure 3 As shown, the signal transceiver module 20 can be a field programmable gate array (FPGA) chip, and the signal transceiver module 20 is connected to the signal input terminal RX through the In pin on the right, and is connected to the signal output terminal TX through the Out pin on the right; connected to the SYI pin of the digital signal processing (DSP) module 10 through the Out pin on the left to send a synchronization signal to the digital signal processing module 10; connected to the SYO pin of the digital signal processing module 10 through the In pin on the left to receive the carrier signal sent by the digital signal processing module 10. The signal transceiver module 20 can also be connected to the digital signal processing module 10 through pins such as Fault to achieve other additional functions.

[0051] As an optional embodiment of the present invention, Figure 4 , Figure 5 As shown, the carrier signal is a triangular signal, and the carrier signal is at a trough at the beginning of each counting cycle. The first count value is the number of times the carrier signal reaches the trough after the beginning of the counting cycle.

[0052] The following Figure 2 The case where the ring carrier synchronization network shown includes only four energy storage converters is taken as an example to explain the specific process of achieving carrier synchronization between the energy storage converters.

[0053] like Figure 2 As shown, the ring carrier synchronization network includes four energy storage converters: energy storage converter PCS1, energy storage converter PCS2, energy storage converter PCS3 and energy storage converter PCS4, and the synchronization signal propagates unidirectionally in a clockwise direction between the energy storage converters.

[0054] For example, Figure 4 As shown, the energy storage converter PCS1 first completes the counting cycle of its own carrier signal before the signal input terminal RX receives the synchronization signal sent by the upstream energy storage converter (energy storage converter PCS4). That is, the first count value obtained by the signal transceiver module 20 of the energy storage converter PCS1 by counting the number of cycles of its carrier signal first reaches the first pre-designed value n. Therefore, the energy storage converter PCS1 sends a synchronization signal to the downstream energy storage converter PCS2 through its signal output terminal TX.

[0055] At this time, the signal transceiver module 20 of the energy storage converter PCS2 has not completed the counting cycle of its own carrier signal, so in response to the received synchronization signal, it forwards the synchronization signal to the digital signal processing module 10 of the energy storage converter PCS2, thereby synchronizing its own carrier signal so that its carrier signal starts to circulate again from the trough at this moment. In addition, the signal transceiver module 20 of the energy storage converter PCS2 resets its own first count value and continues to forward the synchronization signal downstream.

[0056] The energy storage converter PCS3 and the energy storage converter PCS4 also synchronize their own carrier signals in response to the synchronization signal received at this moment, so that Figure 4 As shown, the carrier signals of all energy storage converters in the entire ring carrier synchronization network are synchronized with the carrier signal of the energy storage converter PCS1 that completes the counting cycle first.

[0057] like Figure 5 The figure shows the situation where the energy storage converter PCS2 completes the counting cycle first. The principle is the same as the above process and will not be repeated here.

[0058] In order to prevent the energy storage converter that has completed the counting cycle from receiving the synchronization signal forwarded by the upstream energy storage converter again in a short time, as a preferred embodiment of the present invention, the signal transceiver module 20 is also used to count the number of period cycles of the corresponding carrier signal after receiving the synchronization signal each time to obtain a second count value;

[0059] The signal transceiver module 20 is further configured to compare the second count value with a second pre-designed value when receiving the synchronization signal sent by the upstream signal transceiver module 20; if the second count value is greater than the second pre-designed value, the synchronization signal is sent to the corresponding digital signal processing module 10, and the current counting cycle is terminated in advance; if the second count value is not greater than the second pre-designed value, the current counting cycle is continued;

[0060] The second pre-designed value is smaller than the first pre-designed value n.

[0061] In an embodiment of the present invention, the signal transceiver module 20 is also used to count the number of periodic cycles of the corresponding carrier signal after each reception of the synchronization signal to obtain a second count value, and refuse to respond to a new synchronization signal before the second count value reaches a second pre-designed value, thereby avoiding repeated cyclic forwarding of the same synchronization signal in the ring carrier synchronization network.

[0062] The second pre-designed value may be an integer close to the first pre-designed value n. For example, optionally, the second preset count value is the first pre-designed value n minus 1, that is, n-1.

[0063] In order to prevent the energy storage converter that completes the counting cycle first from receiving the synchronization signal of the energy storage converter that completes the synchronization last and then continuing to forward it downstream back to the origin, as a preferred embodiment of the present invention, the signal transceiver module 20 is also used to count the number of period cycles of the corresponding carrier signal after sending the synchronization signal each time, and obtain a third count value;

[0064] The signal transceiver module 20 is also used to compare the second count value and the third count value with the second pre-designed value when receiving the synchronization signal sent by the upstream signal transceiver module 20. If the second count value and the third count value are both greater than the second pre-designed value, the synchronization signal is sent to the corresponding digital signal processing module 10 and the current counting cycle is terminated in advance; if at least one of the second count value and the third count value is not greater than the second pre-designed value, the current counting cycle is continued.

[0065] In an embodiment of the present invention, the signal transceiver module 20 is also used to count the number of periodic cycles of the corresponding carrier signal after each synchronization signal is sent out to obtain a third count value, and refuse to respond to a new synchronization signal before the second count value reaches a second pre-designed value, so that the energy storage inverter that completes the counting cycle first each time refuses to receive the synchronization signal forwarded by its upstream energy storage inverter, further avoiding the repeated cyclic forwarding of the same synchronization signal in the ring carrier synchronization network.

[0066] As a second aspect of the present invention, a carrier synchronization method is provided, and the carrier synchronization method is applied to the energy storage converter in the ring carrier synchronization network provided in an embodiment of the present invention, such as Figure 6 As shown, the carrier synchronization method includes:

[0067] Step S1, periodically counting the number of periodic cycles of the corresponding carrier signal;

[0068] Step S2, sending a synchronization signal to the downstream energy storage converter at the end of each counting cycle; and

[0069] Step S2: upon receiving the synchronization signal from the upstream energy storage converter, synchronization is performed based on the synchronization signal, so that the carrier signal is synchronized with the carrier signal corresponding to the upstream energy storage converter, the synchronization signal is sent to the downstream energy storage converter, and the current counting cycle is ended in advance.

[0070] In the carrier synchronization method provided by the present invention, the energy storage inverter (PCS) in the ring carrier synchronization network has a single transceiver function, and the energy storage inverter can periodically count the number of periodic cycles of its carrier signal. When the carrier signals of multiple energy storage inverters are not synchronized, the energy storage inverter that first ends the counting cycle sends a synchronization signal to the downstream energy storage inverter, so that the carrier signal of the downstream energy storage inverter is synchronized with its carrier signal. The downstream energy storage inverter ends the current counting cycle in advance and sends a synchronization signal to the downstream energy storage inverter to synchronize it, finally realizing the carrier synchronization between all energy storage inverters in the ring carrier synchronization network.

[0071] In the present invention, the energy storage converter only needs to be connected to the adjacent energy storage converters on both sides, so that the synchronization signal can be transmitted unidirectionally to each energy storage converter along the ring carrier synchronization network, completing the carrier synchronization of the entire ring carrier synchronization network, and reducing the hardware cost of the ring carrier synchronization network. In addition, when an energy storage converter in the ring carrier synchronization network fails or a single-point carrier synchronization line fails, although the ring carrier synchronization network is disconnected at the fault point, the remaining normal energy storage converters can still form a link for unidirectional transmission of synchronization signals, and the upstream energy storage converter sends the initial synchronization signal at the end of each counting cycle, and the carrier synchronization between all normal energy storage converters in the ring carrier synchronization network is maintained in the presence of a faulty device or line, thereby improving the stability of the ring carrier synchronization network.

[0072] In order to prevent the energy storage converter that has completed the counting cycle from receiving the synchronization signal forwarded by the upstream energy storage converter again in a short time, as a preferred embodiment of the present invention, the carrier synchronization method further includes counting the number of period cycles of the carrier signal after receiving the synchronization signal each time to obtain a second count value;

[0073] When receiving the synchronization signal sent by the upstream signal transceiver module 20, the second count value is compared with the second pre-designed value. If the second count value is greater than the second pre-designed value, the synchronization signal is sent to the corresponding digital signal processing module 10, and the current counting cycle is ended in advance (such as Figure 7 If the second count value is not greater than the second pre-set value, the current count cycle is continued;

[0074] The second pre-designed value is smaller than the first pre-designed value n.

[0075] In order to prevent the energy storage converter that completes the counting cycle first from receiving the synchronization signal of the energy storage converter that completes the synchronization last and then continuing to forward it downstream back to the origin, as a preferred embodiment of the present invention, the carrier synchronization method further includes counting the number of period cycles of the corresponding carrier signal after each synchronization signal is sent to obtain a third count value;

[0076] When receiving the synchronization signal sent by the upstream signal transceiver module 20, the second count value and the third count value are compared with the second pre-designed value. If the second count value and the third count value are both greater than the second pre-designed value, the synchronization signal is sent to the corresponding digital signal processing module 10, and the current counting cycle is terminated in advance (such as Figure 8 If at least one of the second count value and the third count value is not greater than the second pre-designed value, the current count cycle is continued.

[0077] As a third aspect of the present invention, an energy storage converter is provided, and the energy storage converter is used to implement the carrier synchronization method provided in an embodiment of the present invention.

[0078] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A ring carrier synchronization network, characterized in that: The annular carrier synchronous network includes a plurality of energy storage converters, the energy storage converters are used to control the corresponding battery output power supply signal based on the carrier signal, the energy storage converters have a signal output end and a signal receiving end, and the signal output end of the energy storage converter is connected to the signal receiving end of the downstream energy storage converter, and the signal receiving end of the energy storage converter is connected to the signal output end of the upstream energy storage converter, so that the plurality of energy storage converters are interconnected to form the annular carrier synchronous network; The energy storage converter is used to periodically count the number of cycles of the corresponding carrier signal, and send a synchronization signal to the downstream energy storage converter through the signal output end at the end of each counting cycle; the carrier signal is a triangular signal, and the carrier signal is at a trough at the beginning of each counting cycle; The energy storage inverter is also used to synchronize based on the synchronization signal when the signal receiving end receives the synchronization signal of the upstream energy storage inverter, so that its carrier signal starts to circulate again from the trough at this moment, so that the carrier signal corresponding to the energy storage inverter is synchronized with the carrier signal corresponding to the upstream energy storage inverter, and sends the synchronization signal to the downstream energy storage inverter, and ends the current counting cycle ahead of schedule.

2. The ring carrier synchronization network according to claim 1, characterized in that: The energy storage converter includes a digital signal processing module and a signal transceiver module, wherein the digital signal processing module is used to control the corresponding battery output power supply signal based on the carrier signal, and is also used to synchronize based on the synchronization signal when receiving the synchronization signal; The signal transceiver module is used to periodically count the number of periodic cycles of the corresponding carrier signal, and send a synchronization signal to the signal transceiver module of the downstream energy storage inverter through the signal output end at the end of each counting cycle; it is also used to send the synchronization signal to the corresponding digital signal processing module when the synchronization signal sent by the upstream signal transceiver module is received through the signal receiving end, and end the current counting cycle in advance.

3. The ring carrier synchronization network according to claim 2, characterized in that: The signal transceiver module is specifically used to count the number of periodic cycles of the corresponding carrier signal in each counting cycle to obtain a first counting value, and determine that the counting cycle ends when the first counting value reaches a first pre-designed value; the early termination of the current counting cycle is specifically to clear the first counting value to zero.

4. The ring carrier synchronization network according to claim 3, characterized in that: The signal transceiver module is also used to count the number of period cycles of the corresponding carrier signal each time the synchronization signal is received to obtain a second count value; The signal transceiver module is further configured to compare the second count value with a second pre-designed value when receiving the synchronization signal sent by the upstream signal transceiver module, and if the second count value is greater than the second pre-designed value, send the synchronization signal to the corresponding digital signal processing module and end the current counting cycle in advance; If the second count value is not greater than the second pre-set value, continue the current count cycle; The second pre-designed value is smaller than the first pre-designed value.

5. The ring carrier synchronization network according to claim 4, characterized in that: The signal transceiver module is also used to count the number of period cycles of the corresponding carrier signal after sending the synchronization signal each time, so as to obtain a third count value; The signal transceiver module is further configured to compare the second count value and the third count value with a second pre-designed value when receiving the synchronization signal sent by the upstream signal transceiver module; if the second count value and the third count value are both greater than the second pre-designed value, the synchronization signal is sent to the corresponding digital signal processing module, and the current counting cycle is terminated in advance; If at least one of the second count value and the third count value is not greater than the second pre-set value, the current count cycle is continued.

6. The ring carrier synchronization network according to claim 5, characterized in that: The second preset count value is the first pre-designed value minus 1.

7. The ring carrier synchronization network according to any one of claims 3 to 6, characterized in that: The first count value is the number of times the carrier signal reaches a valley after the counting cycle starts.

8. The ring carrier synchronization network according to any one of claims 2 to 6, characterized in that: The signal transceiver module is a field programmable logic gate array circuit.

9. A carrier synchronization method, characterized in that: The carrier synchronization method is applied to the energy storage converter in the ring carrier synchronization network according to any one of claims 1 to 8, and the carrier synchronization method includes: Periodically counting the number of cycles of the corresponding carrier signal, and sending a synchronization signal to the downstream energy storage converter at the end of each counting cycle; and, When the synchronization signal of the upstream energy storage converter is received, synchronization is performed based on the synchronization signal, so that the carrier signal is synchronized with the carrier signal corresponding to the upstream energy storage converter, the synchronization signal is sent to the downstream energy storage converter, and the current counting cycle is ended in advance.

10. The carrier synchronization method according to claim 9, characterized in that: The energy storage converter includes a digital signal processing module and a signal transceiver module, wherein the digital signal processing module is used to control the corresponding battery output power supply signal based on the carrier signal, and is also used to synchronize based on the synchronization signal when receiving the synchronization signal; The signal transceiver module is used to periodically count the number of periodic cycles of the corresponding carrier signal, and send a synchronization signal to the signal transceiver module of the downstream energy storage converter through the signal output end at the end of each counting cycle; and is also used to send the synchronization signal to the corresponding digital signal processing module when the synchronization signal sent by the upstream signal transceiver module is received through the signal receiving end, and end the current counting cycle in advance; The signal transceiver module is specifically used to count the number of periodic cycles of the corresponding carrier signal in each counting cycle to obtain a first counting value, and determine that the counting cycle ends when the first counting value reaches a first pre-designed value; the early termination of the current counting cycle is specifically to clear the first counting value to zero; The carrier synchronization method further comprises counting the number of periodic cycles of the carrier signal after receiving the synchronization signal each time to obtain a second count value; and when receiving the synchronization signal sent by the upstream signal transceiver module, comparing the second count value with a second pre-designed value, if the second count value is greater than the second pre-designed value, sending the synchronization signal to the corresponding digital signal processing module, and ending the current counting cycle in advance; if the second count value is not greater than the second pre-designed value, continuing the current counting cycle; The second pre-designed value is smaller than the first pre-designed value.

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