Bidirectional new energy synchronous machine system and control method thereof

Abstract

The invention discloses a bidirectional new energy synchronous machine system and a control method thereof, and belongs to the technical field of new energy synchronous machine grid-connected control, and the method comprises the steps: S1, collecting the real-time operation data of a power system, and initializing a controller; s2, judging whether the bidirectional new energy synchronous machine system meets a grid connection condition or not based on the real-time operation data of the power system; s3, after the two-way new energy synchronous machine system meets the grid connection condition and executes the grid connection action, the initialized controller detects the corresponding power generation state of the two-way new energy synchronous machine system; s4, when the bidirectional new energy synchronous machine system is in a grid-connected non-power-generation state, the controller sends a support instruction according to the real-time operation data of the bidirectional new energy synchronous machine system and the real-time operation data of the power system; s5, the bidirectional new energy synchronous machine system responds to the support instruction and fully utilizes the reactive power resource of the new energy synchronous machine system to adjust the voltage of the power system; the frequency stability of the power system is effectively maintained, and the stability of the power system is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy synchronous machine grid-connected control, and in particular to a bidirectional new energy synchronous machine system and a control method thereof. Background Art

[0002] With the development of new energy technology, a large number of thermal power units in traditional power systems have been replaced by new energy power generation units. At the same time, in order to adapt to the instability of the power generation efficiency of new energy power generation units, a large number of power electronic converters have been introduced into the new power system, which makes the new power system have problems such as reduced inertia and reduced reactive power regulation ability compared with the traditional power system. In response to these problems, some scholars have proposed a grid-connected technology for bidirectional new energy synchronous machines, that is, the new energy power generation unit drives the synchronous motor through the converter, and the synchronous motor drags the synchronous generator to the grid, so that the new energy power generation unit is connected to the grid through the real synchronous machine interface instead of the power electronic grid interface, so that the new energy power generation unit can provide inertia, damping and reactive support functions to the power system. However, in actual application, especially photovoltaic power generation units, when the power generation efficiency of the photovoltaic unit fluctuates greatly due to changes in light conditions, the bidirectional new energy synchronous machine is difficult to follow the operating state of the photovoltaic unit, resulting in instability in the power system.

[0003] Chinese patent, publication number: CN115065096A, publication date: September 16, 2022, discloses a bidirectional coupling new energy synchronous machine system and operation method, including: the site-level management system determines whether the output of the new energy power generation unit is normal. If the output of the new energy power generation unit is normal, the power is normally sent out, and the bidirectional coupling new energy synchronous machine is in the power generation mode; if the output of the new energy power generation unit is insufficient, it is determined whether the energy storage power is sufficient; if the energy storage power is sufficient, the bidirectional coupling new energy synchronous machine is in the phase adjustment mode; if the energy storage power is insufficient, it is determined whether the power grid power is sufficient; if the power grid power is sufficient, the bidirectional coupling new energy synchronous machine starts the reverse mode; if the power grid power is insufficient, at this time, if the power grid operation requires voltage support and can meet the no-load loss of about 5% of the bidirectional coupling new energy synchronous machine, the bidirectional coupling new energy synchronous machine can operate in the phase adjustment mode and has a higher priority, otherwise the machine needs to be cut off to ensure the stability of the system frequency; however, the invention does not make full use of the reactive resources of the new energy synchronous machine system to adjust the frequency of the power system, resulting in poor stability of the power system. Summary of the invention

[0004] The purpose of the present invention is to address the problem that the prior art does not fully utilize the reactive resources of the new energy synchronous machine system to regulate the frequency of the power system, resulting in poor stability of the power system; a control method for a bidirectional new energy synchronous machine system is proposed, which determines whether the bidirectional new energy synchronous machine system has the conditions for grid connection through real-time operation data of the power system, and plans the reactive support action of the bidirectional new energy synchronous machine system according to the power generation status, real-time operation data and real-time operation data of the power system after grid connection, as well as the support instructions corresponding to the reactive support action. Finally, the bidirectional new energy synchronous machine system executes the corresponding reactive support action in response to the support instruction to regulate the voltage of the power system, maintain the stability of the power system frequency, and significantly improve the stability of the power system.

[0005] In a first aspect, a technical solution provided in an embodiment of the present invention is a control method for a bidirectional new energy synchronous machine system, comprising the following steps: S1, collect real-time operation data of the power system and initialize the controller; S2. Determine whether the bidirectional new energy synchronous machine system meets the grid connection conditions based on the real-time operation data of the power system; S3, when the bidirectional new energy synchronous machine system meets the grid-connected conditions and performs the grid-connected action, the initialized controller detects the corresponding power generation state of the bidirectional new energy synchronous machine system; S4. When the bidirectional new energy synchronous machine system is in a state of being connected to the grid and not generating electricity, the controller issues a support instruction according to the real-time operation data of the bidirectional new energy synchronous machine system and the real-time operation data of the power system; S5. The bidirectional new energy synchronous machine system adjusts the power system voltage in response to the support instruction.

[0006] In this scheme, whether the bidirectional new energy synchronous machine system meets the grid-connected conditions is judged based on the real-time operation data of the power system, so as to avoid the fluctuation of the power system and damage to the power equipment when the bidirectional new energy synchronous machine system is connected to the power system. After the bidirectional new energy synchronous machine system is connected to the power system, the controller is used to detect the power generation state of the bidirectional new energy synchronous machine system to determine the proportion of active resources and reactive resources. When the active resources are small and the reactive resources are large, that is, the grid-connected non-power generation state, the controller plans the reactive support action according to the real-time operation data of the bidirectional new energy synchronous machine system and the real-time operation data of the power system and issues the corresponding support instruction. Finally, the bidirectional new energy synchronous machine system executes the corresponding reactive support action in response to the support instruction to adjust the power system voltage, maintain the stability of the power system frequency, and significantly improve the stability of the power system.

[0007] Preferably, in S1, the specific process of collecting the real-time operation data of the power system and initializing the controller is as follows: S11, collecting the real-time voltage and real-time current of the grid connection point corresponding to the bidirectional new energy synchronous machine system in the power system; Synchronously, collect the real-time voltage and current of the bidirectional new energy synchronous machine system; S12. Set the proportional coefficient, integral coefficient, voltage threshold, current threshold, voltage judgment time, and current judgment time of the controller according to the real-time voltage and current of the power system and the real-time voltage and current of the bidirectional new energy synchronous machine system.

[0008] In this solution, the controller is initialized according to the real-time voltage and real-time current of the power system and the real-time voltage and real-time current of the bidirectional new energy synchronous machine system, and the relevant control parameters of the controller are set so that the operation standard of the controller is consistent with the actual working environment, effectively improving the accuracy of the current and voltage control of the controller when it is working.

[0009] Preferably, in S2, the specific process of judging whether the bidirectional new energy synchronous machine system meets the grid connection conditions based on the real-time operation data of the power system is: S21, judging whether the bidirectional new energy synchronous machine system meets the conditions for power grid connection based on the real-time voltage and real-time current of the bidirectional new energy synchronous machine system; Synchronously, the power generation capacity of the photovoltaic components in the bidirectional new energy synchronous machine system is calculated according to the real-time voltage and the real-time current of the bidirectional new energy synchronous machine system, and it is determined whether the power generation capacity meets the output grid connection conditions; S22: When the bidirectional new energy synchronous machine system meets the conditions for power grid connection, and the power generation capacity of the photovoltaic modules in the bidirectional new energy synchronous machine system meets the conditions for power grid connection, the bidirectional new energy synchronous machine system meets the conditions for power grid connection.

[0010] In this solution, the real-time voltage and real-time current of the bidirectional new energy synchronous machine system are used to determine whether the electric energy generated by the bidirectional new energy synchronous machine system will have an impact on the electric energy of the power system, thereby ensuring that the electric energy generated by the bidirectional new energy synchronous machine system can be safely and smoothly integrated into the power system. The power generation capacity of the bidirectional new energy synchronous machine system is calculated by the real-time voltage and real-time current to determine whether it meets the output grid-connected conditions, thereby ensuring the reliability of power generation of the bidirectional new energy synchronous machine system.

[0011] Preferably, in S2, when the bidirectional new energy synchronous machine system does not meet the grid connection condition, the controller determines whether the bidirectional new energy synchronous machine system meets the grid connection condition according to a preset detection cycle cycle.

[0012] In this scheme, the real-time operating status of the bidirectional new energy synchronous machine system is cyclically detected, and the changes in the operating status of the bidirectional new energy synchronous machine system can be obtained by following the changes in the corresponding excitation source, and the bidirectional new energy synchronous machine system can be connected to the power system to participate in controlling the power system voltage as soon as the bidirectional new energy synchronous machine system meets the grid-connected conditions.

[0013] Preferably, in S3, the specific process of the initialized controller detecting the corresponding power generation state of the bidirectional new energy synchronous machine system is: S31, judging the illumination intensity of the bidirectional new energy synchronous machine system according to the maximum power voltage of the bidirectional new energy synchronous machine system and the calculated voltage standard value; S32: When the light intensity is low, the power generation state of the bidirectional new energy synchronous machine system is determined according to the real-time current of the bidirectional new energy synchronous machine system and the current threshold of the controller.

[0014] In this solution, judging the light intensity of the bidirectional new energy synchronous machine system can determine its corresponding power generation efficiency under the current state and when other conditions remain unchanged, and on this basis, judging the power generation state of the bidirectional new energy synchronous machine system, which serves as the basis for the generation of subsequent support instructions.

[0015] Preferably, in S31, the calculation formula of the voltage standard value is as follows: Where U sta is the voltage standard value, U MPPT is the maximum power voltage of the bidirectional new energy synchronous machine system, U o It is the open circuit voltage of the photovoltaic components of the bidirectional new energy synchronous machine system under the current temperature and light conditions.

[0016] Preferably, after the power generation state of the bidirectional new energy synchronous machine system is determined, the controller cyclically detects the power generation state of the bidirectional new energy synchronous machine system according to a preset control cycle.

[0017] In this scheme, the power generation state of the bidirectional new energy synchronous machine system is cyclically detected, and the changes in the power generation state of the bidirectional new energy synchronous machine system can be continuously monitored to track the operating state of the photovoltaic components in the bidirectional new energy synchronous machine system.

[0018] Preferably, in S4, the specific process of the controller issuing a support instruction according to the real-time operation data of the bidirectional new energy synchronous machine system and the real-time operation data of the power system is: S41, the controller determines the required support strength of the corresponding node of the bidirectional new energy synchronous machine system according to the real-time operation data of the power system; synchronously, the controller determines the current support capacity of the bidirectional new energy synchronous machine system according to the real-time operation data of the bidirectional new energy synchronous machine system; S42, the controller issues a support instruction according to the required support strength of the corresponding node of the bidirectional new energy synchronous machine system and the current support capacity of the bidirectional new energy synchronous machine system.

[0019] In this solution, the required support strength of the corresponding node of the bidirectional new energy synchronous machine system in the power system and the support capacity of the bidirectional new energy synchronous machine system are determined, and at least one bidirectional new energy synchronous machine system can be mobilized according to the node to participate in controlling the voltage of the power system, so as to maximize the utilization efficiency of the reactive resources and active resources of the bidirectional new energy synchronous machine system.

[0020] Preferably, in S5, the specific process of the bidirectional new energy synchronous machine system adjusting the power system voltage in response to the support instruction is: S51, setting a voltage reference value of the bidirectional new energy synchronous machine system based on the support instruction; S52, calculating a modulation wave signal according to the voltage reference value and the real-time voltage of the bidirectional new energy synchronous machine system; S53. The bidirectional new energy synchronous machine system adjusts the power system voltage in response to the modulation wave signal.

[0021] On the other hand, a technical solution also provided in an embodiment of the present invention is a bidirectional new energy synchronous machine system, comprising: a photovoltaic module, an inverter, a bidirectional new energy synchronous machine, and a transformer; wherein the DC output end of the photovoltaic module is electrically connected to the DC input end of the inverter, the output end of the inverter is electrically connected to the input end of the bidirectional new energy synchronous machine, and the output end of the bidirectional new energy synchronous machine is electrically connected to the input end of the transformer.

[0022] The present invention has at least the following substantial effects: The present application determines whether the bidirectional new energy synchronous machine system meets the grid-connected conditions based on the real-time operation data of the power system, so as to avoid the fluctuation of the power system and damage to the power equipment when the bidirectional new energy synchronous machine system is connected to the power system. After the bidirectional new energy synchronous machine system is connected to the power system, the controller is used to detect the power generation state of the bidirectional new energy synchronous machine system to determine the proportion of active resources and reactive resources. When the active resources are small and the reactive resources are large, that is, the grid-connected non-power generation state, the controller plans reactive support actions according to the real-time operation data of the bidirectional new energy synchronous machine system and the real-time operation data of the power system and issues corresponding support instructions. In this process, the power generation state of the bidirectional new energy synchronous machine system is cyclically detected according to a preset period, so as to make targeted changes at the first time when the excitation source changes. Finally, the bidirectional new energy synchronous machine system responds to the support instruction to execute the corresponding reactive support action to adjust the power system voltage, maintain the stability of the power system frequency, and significantly improve the stability of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings. The drawings are only for the purpose of illustrating preferred embodiments and are not to be considered as limiting the present invention. Also, the same reference symbols are used throughout the drawings to represent the same parts.

[0024] Figure 1 This is a flow chart of a control method of a bidirectional new energy synchronous machine system of the present invention; Figure 2 The figure is a structural diagram of a bidirectional new energy synchronous machine system. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific implementation method described herein is only an optimal embodiment of the present invention, which is only used to explain the present invention and does not limit the scope of protection of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow charts describe the operations (or steps) as sequential processes, many of the operations (or steps) therein can be implemented in parallel, concurrently, or simultaneously. In addition, the order of the operations can be rearranged. The process can be terminated when its operation is completed, but can also have additional steps not included in the drawings; the process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0027] Embodiment 1: like Figure 1 As shown, this embodiment provides a control method for a bidirectional new energy synchronous machine system, comprising the following steps: S1. Collect real-time operation data of the power system and initialize the controller.

[0028] S11, collecting the real-time voltage and real-time current of the grid connection point corresponding to the bidirectional new energy synchronous machine system in the power system; Synchronously, collect the real-time voltage and current of the bidirectional new energy synchronous machine system; S12. Set the proportional coefficient, integral coefficient, voltage threshold, current threshold, voltage judgment time, and current judgment time of the controller according to the real-time voltage and current of the power system and the real-time voltage and current of the bidirectional new energy synchronous machine system.

[0029] S2. Determine whether the bidirectional new energy synchronous machine system meets the grid connection conditions based on the real-time operation data of the power system.

[0030] S21, judging whether the bidirectional new energy synchronous machine system meets the conditions for power grid connection based on the real-time voltage and real-time current of the bidirectional new energy synchronous machine system; Synchronously, the power generation capacity of the photovoltaic components in the bidirectional new energy synchronous machine system is calculated according to the real-time voltage and the real-time current of the bidirectional new energy synchronous machine system, and it is determined whether the power generation capacity meets the output grid connection conditions; S22: When the bidirectional new energy synchronous machine system meets the conditions for power grid connection, and the power generation capacity of the photovoltaic modules in the bidirectional new energy synchronous machine system meets the conditions for power grid connection, the bidirectional new energy synchronous machine system meets the conditions for power grid connection.

[0031] In one embodiment, when the bidirectional new energy synchronous machine system does not meet the grid connection condition, the controller determines whether the bidirectional new energy synchronous machine system meets the grid connection condition according to a preset detection cycle cycle.

[0032] In this embodiment, the grid connection condition judgment can be automatically or manually performed by the controller in cooperation with the dispatching module in the power system.

[0033] S3. When the bidirectional new energy synchronous machine system meets the grid-connected conditions and performs the grid-connected action, the initialized controller detects the corresponding power generation state of the bidirectional new energy synchronous machine system.

[0034] S31. Determine the illumination intensity of the bidirectional new energy synchronous machine system according to the maximum power voltage of the bidirectional new energy synchronous machine system and the calculated voltage standard value.

[0035] In one embodiment, the calculation formula of the voltage standard value is as follows: Where U sta is the voltage standard value, U MPPT is the maximum power voltage of the bidirectional new energy synchronous machine system, U o It is the open circuit voltage of the photovoltaic components of the bidirectional new energy synchronous machine system under the current temperature and light conditions.

[0036] S32: When the light intensity is low, the power generation state of the bidirectional new energy synchronous machine system is determined according to the real-time current of the bidirectional new energy synchronous machine system and the current threshold of the controller.

[0037] In one embodiment, after the power generation state of the bidirectional new energy synchronous machine system is determined, the controller cyclically detects the power generation state of the bidirectional new energy synchronous machine system according to a preset control cycle.

[0038] In this embodiment, the bidirectional new energy synchronous machine system meets the grid-connected conditions and performs the grid-connected action, that is, when the bidirectional new energy synchronous machine system is normally grid-connected, the output voltage U of the photovoltaic module in the bidirectional new energy synchronous machine system under the maximum power point tracking mode MPPT is first detected. mppt Is it less than the voltage threshold of the photovoltaic module under the DC voltage constraint condition, that is, the voltage standard value U sta ; When the output voltage U mppt Greater than or equal to the voltage standard value U sta When the output voltage U mppt Less than the voltage standard value U sta , and the duration of this state is greater than the preset voltage judgment time of the controller, it is judged that the light intensity received by the photovoltaic component is low, and the photovoltaic current constraint judgment is entered; the logic of the photovoltaic current constraint judgment is to compare the output current of the DC side of the photovoltaic component with the current threshold preset by the controller. When the DC side output current is greater than the current threshold, it is judged that the bidirectional new energy synchronous machine system is in a grid-connected power generation state. When the DC side output current is less than or equal to the current threshold, and the duration of this state is greater than the preset current judgment time of the controller, it means that the output of the photovoltaic component is insufficient, and the bidirectional new energy synchronous machine system is in a grid-connected non-power generation state. At this time, the reference voltage involved in the subsequent generation of the support instruction by the controller is calculated according to the voltage standard value calculation formula. If the duration of the state corresponding to the DC side output current being less than or equal to the current threshold is less than or equal to the preset current judgment time of the controller, it is judged that the bidirectional new energy synchronous machine system is in a normal grid-connected power generation state.

[0039] S4. When the bidirectional new energy synchronous machine system is in a state of being connected to the grid but not generating electricity, the controller issues a support instruction according to the real-time operation data of the bidirectional new energy synchronous machine system and the real-time operation data of the power system.

[0040] S41, the controller determines the required support strength of the corresponding node of the bidirectional new energy synchronous machine system according to the real-time operation data of the power system; Synchronously, the controller determines the current support capability of the bidirectional new energy synchronous machine system according to the real-time operation data of the bidirectional new energy synchronous machine system; S42, the controller issues a support instruction according to the required support strength of the corresponding node of the bidirectional new energy synchronous machine system and the current support capacity of the bidirectional new energy synchronous machine system.

[0041] In this embodiment, the required support strength of the node is essentially the voltage regulation amount required by the node relative to the average voltage of the power system, and the current support capacity is essentially the voltage adjustable amount that the corresponding bidirectional new energy synchronous machine system can use to adjust the voltage of the power system. According to the voltage regulation amount and the voltage adjustable amount, multiple bidirectional new energy synchronous machine systems corresponding to the corresponding node can be mobilized to cooperate with each other, and the active resources and reactive resources of the bidirectional new energy synchronous machine system are utilized with maximum efficiency. At the same time, the controller also uses relevant current data in the process of generating support instructions to ensure that the power of the bidirectional new energy synchronous machine system and the power of the power system promote each other in balance, and the support instruction acts on the bidirectional new energy synchronous machine system to select the reactive control mode. Secondly, in the process of generating support instructions, the controller can also judge whether the power system needs stronger dynamic reactive support according to the real-time scheduling requirements of the power system, that is, the required support strength of the node, and then determine whether the generator in the corresponding bidirectional new energy synchronous machine system adopts the strong excitation mode or the conventional excitation mode.

[0042] S5. The bidirectional new energy synchronous machine system adjusts the power system voltage in response to the support instruction.

[0043] S51, setting a voltage reference value of the bidirectional new energy synchronous machine system based on the support instruction; S52, calculating a modulation wave signal according to the voltage reference value and the real-time voltage of the bidirectional new energy synchronous machine system; S53. The bidirectional new energy synchronous machine system adjusts the power system voltage in response to the modulation wave signal.

[0044] In this embodiment, the bidirectional new energy synchronous machine system is already in a grid-connected non-power generation state at this time, and its voltage reference value is a voltage threshold preset by the controller. If the bidirectional new energy synchronous machine system is in a grid-connected power generation state, then its corresponding voltage reference value is the maximum power voltage U output by the bidirectional new energy synchronous machine system in the maximum power point tracking mode MPPT. MPPT .

[0045] like Figure 2 As shown, a technical solution also provided in the embodiment of the present invention is a bidirectional new energy synchronous machine system, including: a photovoltaic component, an inverter, a bidirectional new energy synchronous machine, and a transformer; wherein the DC output end of the photovoltaic component is electrically connected to the DC input end of the inverter, the output end of the inverter is electrically connected to the input end of the bidirectional new energy synchronous machine, and the output end of the bidirectional new energy synchronous machine is electrically connected to the input end of the transformer.

[0046] In this embodiment, the inverter is specifically a photovoltaic inverter dedicated to photovoltaic modules, and the bidirectional new energy synchronous machine includes a synchronous motor and a synchronous generator, wherein the input end of the synchronous motor serves as the input end of the bidirectional new energy synchronous machine, and the output end of the synchronous generator serves as the output end of the bidirectional new energy synchronous machine, and the rotating shaft of the synchronous motor is mechanically connected to the rotating shaft of the synchronous generator through a coupling; in addition, the bidirectional new energy synchronous machine system is controlled by a controller, and the controller can collect electrical quantities such as voltage and current of the corresponding nodes of the bidirectional new energy synchronous machine system incorporated into the power system, as well as electrical quantities such as current and voltage of the photovoltaic modules in the bidirectional new energy synchronous machine system.

[0047] In summary, the controller determines the working state of the bidirectional new energy synchronous machine system according to the real-time operating data of the power system and the real-time operating data of the photovoltaic components, and calculates the modulation wave signal required by the photovoltaic inverter based on the working state and the voltage reference value of the bidirectional new energy synchronous machine system. The photovoltaic inverter adjusts its output voltage according to the modulation wave signal to control the output voltage of the bidirectional new energy synchronous machine system, and the control algorithm adopted by the controller is a DC voltage or active power control algorithm.

[0048] This embodiment has at least the following substantial effects: This embodiment determines whether the bidirectional new energy synchronous machine system meets the grid-connected conditions based on the real-time operation data of the power system, so as to avoid the fluctuation of the power system and damage to the power equipment when the bidirectional new energy synchronous machine system is connected to the power system. After the bidirectional new energy synchronous machine system is connected to the power system, the controller is used to detect the power generation state of the bidirectional new energy synchronous machine system to determine the proportion of active resources and reactive resources. When the active resources are small and the reactive resources are large, that is, the grid-connected non-power generation state, the controller plans the reactive support action according to the real-time operation data of the bidirectional new energy synchronous machine system and the real-time operation data of the power system and issues the corresponding support instruction. In this process, the power generation state of the bidirectional new energy synchronous machine system is cyclically detected according to a preset period, so as to make targeted changes at the first time when the excitation source changes. Finally, the bidirectional new energy synchronous machine system executes the corresponding reactive support action in response to the support instruction to adjust the voltage of the power system, maintain the stability of the power system frequency, and significantly improve the stability of the power system.

[0049] The above specific embodiments are preferred embodiments of the present invention, and are not intended to limit the specific implementation scope of the present invention. The scope of the present invention includes but is not limited to the present specific embodiments. All equivalent changes made in accordance with the shape, structure, and method of the present invention are within the protection scope of the present invention.

Claims

1. A control method for a bidirectional new energy synchronous machine system, characterized in that: The method comprises the following steps: S1, collect real-time operation data of the power system and initialize the controller; S2. Determine whether the bidirectional new energy synchronous machine system meets the grid connection conditions based on the real-time operation data of the power system; S3, when the bidirectional new energy synchronous machine system meets the grid-connected conditions and performs the grid-connected action, the initialized controller detects the corresponding power generation state of the bidirectional new energy synchronous machine system; S4. When the bidirectional new energy synchronous machine system is in a state of being connected to the grid and not generating electricity, the controller issues a support instruction according to the real-time operation data of the bidirectional new energy synchronous machine system and the real-time operation data of the power system; S5. The bidirectional new energy synchronous machine system adjusts the power system voltage in response to the support instruction.

2. A control method for a bidirectional new energy synchronous machine system according to claim 1, characterized in that: In S1, the specific process of collecting the real-time operation data of the power system and initializing the controller is: S11, collecting the real-time voltage and real-time current of the grid connection point corresponding to the bidirectional new energy synchronous machine system in the power system; Synchronously, collect the real-time voltage and current of the bidirectional new energy synchronous machine system; S12. Set the proportional coefficient, integral coefficient, voltage threshold, current threshold, voltage judgment time, and current judgment time of the controller according to the real-time voltage and current of the power system and the real-time voltage and current of the bidirectional new energy synchronous machine system.

3. The control method of a bidirectional new energy synchronous machine system according to claim 1, characterized in that: In S2, the specific process of judging whether the bidirectional new energy synchronous machine system meets the grid connection conditions based on the real-time operation data of the power system is as follows: S21, judging whether the bidirectional new energy synchronous machine system meets the conditions for power grid connection based on the real-time voltage and real-time current of the bidirectional new energy synchronous machine system; Synchronously, the power generation capacity of the photovoltaic components in the bidirectional new energy synchronous machine system is calculated according to the real-time voltage and the real-time current of the bidirectional new energy synchronous machine system, and it is determined whether the power generation capacity meets the output grid connection conditions; S22: When the bidirectional new energy synchronous machine system meets the conditions for power grid connection, and the power generation capacity of the photovoltaic modules in the bidirectional new energy synchronous machine system meets the conditions for power grid connection, the bidirectional new energy synchronous machine system meets the conditions for power grid connection.

4. The control method of a bidirectional new energy synchronous machine system according to claim 3 is characterized in that: In S2, when the bidirectional new energy synchronous machine system does not meet the grid connection condition, the controller determines whether the bidirectional new energy synchronous machine system meets the grid connection condition according to a preset detection cycle cycle.

5. The control method of a bidirectional new energy synchronous machine system according to claim 1, characterized in that: In S3, the specific process of the initialized controller detecting the corresponding power generation state of the bidirectional new energy synchronous machine system is: S31, judging the illumination intensity of the bidirectional new energy synchronous machine system according to the maximum power voltage of the bidirectional new energy synchronous machine system and the calculated voltage standard value; S32: When the light intensity is low, the power generation state of the bidirectional new energy synchronous machine system is determined according to the real-time current of the bidirectional new energy synchronous machine system and the current threshold of the controller.

6. A control method for a bidirectional new energy synchronous machine system according to claim 5, characterized in that: In S31, the calculation formula of the voltage standard value is as follows: Where U sta is the voltage standard value, U MPPT is the maximum power voltage of the bidirectional new energy synchronous machine system, U o It is the open circuit voltage of the photovoltaic components of the bidirectional new energy synchronous machine system under the current temperature and light conditions.

7. The control method of a bidirectional new energy synchronous machine system according to claim 5, characterized in that: After the power generation state of the bidirectional new energy synchronous machine system is determined, the controller detects the power generation state of the bidirectional new energy synchronous machine system in a cycle according to a preset control cycle.

8. The control method of a bidirectional new energy synchronous machine system according to claim 1, characterized in that: In S4, the specific process of the controller issuing a support instruction according to the real-time operation data of the bidirectional new energy synchronous machine system and the real-time operation data of the power system is: S41, the controller determines the required support strength of the corresponding node of the bidirectional new energy synchronous machine system according to the real-time operation data of the power system; synchronously, the controller determines the current support capacity of the bidirectional new energy synchronous machine system according to the real-time operation data of the bidirectional new energy synchronous machine system; S42, the controller issues a support instruction according to the required support strength of the corresponding node of the bidirectional new energy synchronous machine system and the current support capacity of the bidirectional new energy synchronous machine system.

9. The control method of a bidirectional new energy synchronous machine system according to claim 1, characterized in that: In S5, the specific process of the bidirectional new energy synchronous machine system adjusting the power system voltage in response to the support instruction is: S51, setting a voltage reference value of the bidirectional new energy synchronous machine system based on the support instruction; S52, calculating a modulation wave signal according to the voltage reference value and the real-time voltage of the bidirectional new energy synchronous machine system; S53. The bidirectional new energy synchronous machine system adjusts the power system voltage in response to the modulation wave signal.

10. A bidirectional new energy synchronous machine system, applicable to a control method of a bidirectional new energy synchronous machine system as claimed in any one of claims 1 to 9, characterized in that: It includes: a photovoltaic module, an inverter, a bidirectional new energy synchronous machine, and a transformer; wherein the DC output end of the photovoltaic module is electrically connected to the DC input end of the inverter, the output end of the inverter is electrically connected to the input end of the bidirectional new energy synchronous machine, and the output end of the bidirectional new energy synchronous machine is electrically connected to the input end of the transformer.

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