Power supply coordinated operation control method and system

Abstract

The invention discloses a power supply coordinated operation control method and system. The power supply coordinated operation control method comprises the following steps: acquiring the voltage of a high-voltage bus, the reactive current of a synchronous power supply and the reactive current of a non-synchronous reactive power supply; establishing a first control loop based on the circulation coefficient of the synchronous power supply and the voltage of the high-voltage bus, and establishing a second control loop based on the circulation coefficient of the asynchronous reactive power supply and the voltage of the high-voltage bus; the reactive current of the synchronous power supply and the reactive current of the asynchronous reactive power supply are input to the first control loop to correct the reactive current of the synchronous power supply, and the reactive current of the asynchronous reactive power supply and the reactive current of the asynchronous reactive power supply are input to the second control loop to correct the reactive current of the asynchronous reactive power supply. And the reactive current of the synchronous power supply is equal to the reactive current of the asynchronous reactive power supply. According to the invention, parallel operation of the synchronous power supply and the asynchronous reactive power supply can be realized, and the problem of reactive circulation during parallel operation is solved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of power generation and operation, and in particular to a method and system for controlling coordinated operation of a power supply. Background Art

[0002] At present, asynchronous reactive power supply is one of the research hotspots and focuses of power system. Due to its low-carbon and environmentally friendly characteristics, its inertia, reactive power and voltage support capabilities are insufficient, and its active output is significantly affected by the external environment. In addition, the operating principles of asynchronous reactive power supply are significantly different from those of current synchronous reactive power supply.

[0003] Non-synchronous reactive power sources mostly operate in current source mode. This model lacks support for system power and frequency, and primarily focuses on internal active power output, severely inadequately supporting voltage under external short-duration transient faults. Traditional synchronous power sources operate as voltage sources, offering mature support mechanisms for system voltage and frequency, rapid response to transient voltages, and short-term overcurrent support. Current research has primarily focused on the two independently, without integrating them, thus failing to fully explore their complementary mechanisms. In recent years, the increasing use of "photovoltaic + solar thermal" (PV + CSP), phase-shifting systems with renewable energy, and photovoltaics for thermal power plant power generation has led to a surge in the number of scenarios. These scenarios rely on the parallel operation of synchronous and non-synchronous reactive power sources. While practical projects primarily focus on active power conversion and allocation, limited research has been conducted on their reactive power and voltage coordination capabilities. Currently, the single-reactive-source two-stage control structure based on thermal power and the single-stage control structure with dual reactive sources at renewable energy stations are not applicable to the parallel operation of synchronous and non-synchronous reactive power sources. Summary of the Invention

[0004] The present invention provides a power supply coordinated operation control method and system to realize the parallel operation of a synchronous power supply and an asynchronous reactive power supply, and solve the reactive circulating current problem during the parallel operation of the synchronous power supply and the asynchronous reactive power supply.

[0005] In a first aspect, an embodiment of the present invention provides a method for controlling coordinated operation of power supplies, the method for controlling coordinated operation of power supplies being used to control a dual power supply system, the dual power supply system comprising a synchronous power supply and an asynchronous reactive power supply, both of which are connected to a high-voltage bus, the method comprising:

[0006] Obtaining the voltage of the high-voltage bus, the reactive current of the synchronous power supply, and the reactive current of the asynchronous reactive power supply;

[0007] Establishing a first control loop based on the circulating current coefficient of the synchronous power supply and the voltage of the high-voltage bus, and establishing a second control loop based on the circulating current coefficient of the non-synchronous reactive power supply and the voltage of the high-voltage bus;

[0008] The reactive current of the synchronous power supply and the reactive current of the asynchronous reactive power supply are input into the first control loop to correct the reactive current of the synchronous power supply, and the reactive current of the asynchronous reactive power supply and the reactive current of the asynchronous reactive power supply are input into the second control loop to correct the reactive current of the asynchronous reactive power supply until the reactive current of the synchronous power supply and the reactive current of the asynchronous reactive power supply are equal.

[0009] In a second aspect, an embodiment of the present invention further provides a power supply coordinated operation control system, which is configured to execute the power supply coordinated operation control method described in any embodiment of the present invention, and the power supply coordinated operation control system includes:

[0010] An acquisition module, configured to acquire the voltage of the high-voltage bus, the reactive current of the synchronous power supply, and the reactive current of the asynchronous reactive power supply;

[0011] A control establishment module, configured to establish a first control loop based on the circulating current coefficient of the synchronous power supply and the voltage of the high-voltage bus, and to establish a second control loop based on the circulating current coefficient of the asynchronous reactive power supply and the voltage of the high-voltage bus;

[0012] A control module is configured to input the reactive current of the synchronous power supply and the reactive current of the asynchronous reactive power supply into the first control loop to correct the reactive current of the synchronous power supply, and input the reactive current of the asynchronous reactive power supply and the reactive current of the asynchronous reactive power supply into the second control loop to correct the reactive current of the asynchronous reactive power supply until the reactive current of the synchronous power supply and the reactive current of the asynchronous reactive power supply are equal.

[0013] The present invention provides a power supply coordinated operation control method and system. The power supply coordinated operation control method is used to control a dual power supply system. The dual power supply system includes a synchronous power supply and a non-synchronous reactive power supply. The synchronous power supply and the non-synchronous reactive power supply are both connected to a high-voltage bus. The power supply coordinated operation control method includes: obtaining the voltage of the high-voltage bus, the reactive current of the synchronous power supply, and the reactive current of the non-synchronous reactive power supply; establishing a first control loop based on the circulating current coefficient of the synchronous power supply and the voltage of the high-voltage bus, and establishing a second control loop based on the circulating current coefficient of the non-synchronous reactive power supply and the voltage of the high-voltage bus; inputting the reactive current of the synchronous power supply and the reactive current of the non-synchronous reactive power supply into the first control loop to correct the reactive current of the synchronous power supply, and inputting the reactive current of the non-synchronous reactive power supply and the reactive current of the non-synchronous reactive power supply into the second control loop to correct the reactive current of the non-synchronous reactive power supply, thereby forming a closed-loop control. Under the action of the closed-loop control, the reactive current of the synchronous power supply and the reactive current of the non-synchronous reactive power supply are equal, thereby realizing the process of suppressing reactive circulating current in the dual power supply system. The invention realizes the parallel operation of a synchronous power supply and an asynchronous reactive power supply, and solves the reactive circulating current problem when the synchronous power supply and the asynchronous reactive power supply are operated in parallel. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the structure of a dual power supply system provided in an embodiment of the present invention.

[0015] Figure 2 This is a flow chart of a power supply coordinated operation control method provided by an embodiment of the present invention.

[0016] Figure 3 This is a control principle diagram of the first control loop provided by an embodiment of the present invention.

[0017] Figure 4 This is a control principle diagram of the second control loop provided by an embodiment of the present invention.

[0018] Figure 5 This is a flow chart of another power supply coordinated operation control method provided by an embodiment of the present invention.

[0019] Figure 6 This is a control principle diagram of the third control loop provided by an embodiment of the present invention.

[0020] Figure 7 This is a flow chart of another power supply coordinated operation control method provided by an embodiment of the present invention.

[0021] Figure 8 A control principle diagram of another power supply coordinated operation control method provided by an embodiment of the present invention.

[0022] Figure 9 Schematic diagram of the structure of a power supply coordinated operation control system in an embodiment of the present invention.

[0023] Figure 10 Schematic diagram of another power supply coordinated operation control system in an embodiment of the present invention.

[0024] Figure 11 2 is a schematic structural diagram of the third control loop in an embodiment of the present invention.

[0025] Figure 12 Schematic diagram of the structure of the first control loop in an embodiment of the present invention.

[0026] Figure 13 Schematic diagram of the structure of the second control loop in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0028] In view of the fact that there is no mature control stabilization system for a synchronous power supply and a non-synchronous reactive power supply parallel system in the prior art, a power supply coordinated operation control method is proposed. The method is capable of adapting to various working conditions such as high and low voltage ride-through, steady-state voltage control, and locked oscillation, and can cope with the effects of large and small disturbances in a synchronous power supply and a non-synchronous reactive power supply parallel system, and has the characteristics of long-term reliability. The power supply coordinated operation control method of this embodiment is applicable to a power supply system in which a synchronous power supply and a non-synchronous reactive power supply operate in parallel. The method can be executed by a power supply coordinated operation control system, which can be implemented in the form of hardware and / or software.

[0029] Figure 1 A schematic diagram of the structure of a dual power supply system provided in an embodiment of the present invention. Figure 2 This is a flow chart of a power supply coordinated operation control method provided by an embodiment of the present invention. The power supply coordinated operation control method according to the embodiment of the present invention is specifically used to control a dual power supply system, such as Figure 1 and Figure 2 As shown, the dual power supply system includes a synchronous power supply and an asynchronous reactive power supply, both of which are connected to the high-voltage bus. The dynamic feedforward control method of the coal-fired generator set includes:

[0030] S110 , obtaining the voltage of the high-voltage bus, the reactive current of the synchronous power supply, and the reactive current of the asynchronous reactive power supply.

[0031] Among them, synchronous power supply includes synchronous reactive power supply, and asynchronous passive power supply refers to a type of asynchronous system that can provide reactive power, which can provide reactive power alone or consume or generate active power at the same time. Figure 1 In the dual power supply system, both the synchronous power supply and the non-synchronous reactive power supply are connected to the high-voltage bus. A synchronous power supply step-up transformer is provided at the connection between the synchronous power supply and the high-voltage bus. In addition, the high-voltage bus is also connected to a system equivalent power supply, and the voltage of the system equivalent power supply is the same as that of the high-voltage bus. The non-synchronous reactive power supply can include many different types of non-synchronous reactive power supplies. Figure 1 The figure shows two different types of asynchronous reactive power sources connected to the high-voltage busbar. Asynchronous reactive power source step-up transformer 1 and step-up transformer 2 are also provided at the connection point between the asynchronous reactive power sources and the high-voltage busbar. These step-up transformers, respectively, perform step-up transformations for the different asynchronous reactive power sources, acting as step-up transformers for the asynchronous reactive power sources. The voltage of the high-voltage busbar serves as a reference value for the high-voltage busbar voltage.

[0032] Specifically, due to the different operating principles of the synchronous power supply and the asynchronous reactive power supply in a dual power supply system, the asynchronous reactive power supply mostly operates in current source mode, while the synchronous power supply is mostly a generator. When the synchronous and asynchronous reactive power supplies operate in parallel, due to differences in control parameters and line impedance between the synchronous and asynchronous reactive power supplies, power distribution will be uneven between the synchronous and asynchronous reactive power supplies, causing circulating current, that is, the reactive circulating current problem. To solve the reactive circulating current problem in the dual power supply system, the output of the synchronous and asynchronous reactive power supplies is controlled by obtaining the voltage of the high-voltage bus, the reactive current of the synchronous power supply, and the reactive current of the asynchronous reactive power supply.

[0033] S120 : Establish a first control loop based on the circulating current coefficient of the synchronous power supply and the voltage of the high-voltage bus, and establish a second control loop based on the circulating current coefficient of the asynchronous reactive power supply and the voltage of the high-voltage bus.

[0034] Specifically, the circulating current coefficient of the synchronous power supply can be determined based on the output power and output current of the synchronous power supply after the synchronous power supply is affected by the circulating current, or based on the actual factory parameters of the synchronous power supply; the circulating current coefficient of the asynchronous reactive power supply can be determined based on the output power and output current of the asynchronous reactive power supply after the asynchronous reactive power supply is affected by the circulating current, or based on the actual factory parameters of the asynchronous reactive power supply. A first control loop is established based on the circulating current coefficient of the synchronous power supply and the voltage of the high-voltage bus to control the reactive current of the synchronous power supply. A second control loop is established based on the circulating current coefficient of the asynchronous reactive power supply and the voltage of the high-voltage bus to control the reactive current of the asynchronous reactive power supply.

[0035] S130. Input the reactive current of the synchronous power supply and the reactive current of the asynchronous reactive power supply into the first control loop to correct the reactive current of the synchronous power supply. Input the reactive current of the asynchronous reactive power supply and the reactive current of the asynchronous reactive power supply into the second control loop to correct the reactive current of the asynchronous reactive power supply until the reactive current of the synchronous power supply and the reactive current of the asynchronous reactive power supply are equal.

[0036] Specifically, the reactive current of the synchronous power supply and the reactive current of the asynchronous reactive power supply are input into a first control loop, a reactive reference value of the synchronous power supply is obtained from the input end of the first control loop, the operation of the synchronous power supply is controlled by the reactive reference value of the synchronous power supply to correct the reactive current of the synchronous power supply, the reactive current of the asynchronous reactive power supply and the reactive current of the asynchronous reactive power supply are input into a second control loop, a first reactive reference value of the asynchronous reactive power supply is obtained from the input end of the second control loop, the operation of the asynchronous reactive power supply is controlled by the first reactive reference value of the asynchronous reactive power supply to correct the reactive current of the asynchronous reactive power supply, thereby forming a closed-loop control. Under the action of the closed-loop control, the reactive current of the synchronous power supply and the reactive current of the asynchronous reactive power supply are equal, thereby achieving a process of suppressing reactive circulating current in the dual power supply system. The present invention realizes the parallel operation of the synchronous power supply and the asynchronous reactive power supply, and solves the reactive circulating current problem when the synchronous power supply and the asynchronous reactive power supply are operated in parallel.

[0037] An embodiment of the present invention provides a power supply coordinated operation control method, which is used to control a dual power supply system. The dual power supply system includes a synchronous power supply and a non-synchronous reactive power supply, both of which are connected to a high-voltage bus. The power supply coordinated operation control method includes: obtaining the voltage of the high-voltage bus, the reactive current of the synchronous power supply, and the reactive current of the non-synchronous reactive power supply; establishing a first control loop based on the circulating current coefficient of the synchronous power supply and the voltage of the high-voltage bus, and establishing a second control loop based on the circulating current coefficient of the non-synchronous reactive power supply and the voltage of the high-voltage bus; inputting the reactive current of the synchronous power supply and the reactive current of the non-synchronous reactive power supply into the first control loop to correct the reactive current of the synchronous power supply, and inputting the reactive current of the non-synchronous reactive power supply and the reactive current of the non-synchronous reactive power supply into the second control loop to correct the reactive current of the non-synchronous reactive power supply, thereby forming a closed-loop control. Under the action of the closed-loop control, the reactive current of the synchronous power supply and the reactive current of the non-synchronous reactive power supply are equal, thereby achieving a process of suppressing reactive circulating current in the dual power supply system. The invention realizes the parallel operation of a synchronous power supply and an asynchronous reactive power supply, and solves the reactive circulating current problem when the synchronous power supply and the asynchronous reactive power supply are operated in parallel.

[0038] Further, Figure 3 A control principle diagram of the first control loop provided in an embodiment of the present invention, Figure 4This is a control principle diagram of the second control loop provided in an embodiment of the present invention. In this embodiment of the present invention, the reactive current of the synchronous power supply and the reactive current of the non-synchronous reactive power supply are input into the first control loop to correct the reactive current of the synchronous power supply, including:

[0039] The reactive current of the synchronous power supply is input as an input value to the input end of the first control loop, and the reactive current of the asynchronous reactive power supply is input as a correction value to the first correction end of the first control loop, and the reactive reference value of the synchronous power supply is obtained from the input end of the first control loop.

[0040] The operation of the synchronous power supply is controlled by the reactive reference value of the synchronous power supply to correct the reactive current of the synchronous power supply.

[0041] Among them, such as Figure 3 and Figure 4 As shown, Iqasy is the reactive current of the non-synchronous reactive power supply, Iqsyn is the reactive current of the synchronous power supply, Uhref is the voltage of the high-voltage bus, also known as the voltage reference value on the high-voltage side, Utasy is the terminal voltage of the non-synchronous reactive power supply, Ksyn is the circulating current coefficient of the synchronous power supply, Kasy is the circulating current coefficient of the non-synchronous reactive power supply, Utsyn is the terminal voltage of the synchronous power supply, AVR is the local control loop of the synchronous power supply, KAVC is the automatic voltage control coefficient of the non-synchronous power supply, EFD is the reactive reference value of the synchronous power supply, and Qasyref is the first reactive reference value of the non-synchronous reactive power supply.

[0042] Specifically, in the first control loop, the reactive current Iqsyn of the synchronous power supply and the reactive current Iqasy of the asynchronous reactive power supply are input into the first control loop. The reactive current Iqsyn of the synchronous power supply is subtracted from the reactive current Iqasy of the asynchronous reactive power supply to obtain a first intermediate value. This first intermediate value is multiplied by the circulating current coefficient Ksyn of the synchronous power supply to obtain a first voltage control value. The first voltage control value is added to the voltage Uhref of the high-voltage bus and the terminal voltage of the synchronous power supply is subtracted to obtain a reactive control value. The reactive control value is input into the local control loop AVR of the synchronous power supply's excitation control system. Finally, the reactive reference value Efd of the synchronous power supply is obtained from the input end of the first control loop. The operation of the synchronous power supply is controlled by the reactive reference value of the synchronous power supply to correct the reactive current of the synchronous power supply. Because the circulating current coefficient Ksyn of the synchronous power supply and the circulating current coefficient Kasy of the asynchronous reactive power supply are relatively large, under the action of closed-loop control, the steady-state deviation will approach zero. Finally, the reactive current Iqasy of the asynchronous reactive power supply is made equal to the reactive current Iqsyn of the synchronous power supply, so that the reactive current Iqsyn of the synchronous power supply and the reactive current Iqasy of the asynchronous reactive power supply converge, thereby realizing the process of suppressing reactive circulating current.

[0043] Furthermore, in an embodiment of the present invention, the reactive current of the asynchronous reactive power supply and the reactive current of the asynchronous reactive power supply are input into the second control loop to correct the reactive current of the asynchronous reactive power supply, including:

[0044] The reactive current of the asynchronous reactive power supply is input as an input value to the input end of the second control loop, the reactive current of the synchronous power supply is input as a correction value to the first correction end of the second control loop, and the first reactive reference value of the asynchronous reactive power supply is obtained from the input end of the second control loop.

[0045] The operation of the asynchronous reactive power supply is controlled by using a first reactive reference value of the asynchronous reactive power supply to correct the reactive current of the asynchronous reactive power supply.

[0046] Specifically, in the second control loop, the reactive current Iqasy of the asynchronous reactive power supply is subtracted from the reactive current Iqsyn of the synchronous power supply to obtain a second intermediate value. The second intermediate value is multiplied by the circulating current coefficient Kasy of the asynchronous reactive power supply to obtain a second voltage control value. The second voltage control value is added to the voltage of the high-voltage bus and the per-unit value UH of the high-voltage bus voltage is subtracted to obtain a second reactive control value. The second reactive control value is multiplied by the automatic voltage control coefficient KAVC of the asynchronous power supply to obtain a first reactive reference value Qasyref of the asynchronous reactive power supply. The first reactive reference value Qasyref is also the reactive current reference value of the asynchronous reactive power supply. The first reactive reference value Qasyref of the asynchronous reactive power supply is used to control the operation of the asynchronous reactive power supply to correct the reactive current of the asynchronous reactive power supply. Because the circulating current coefficient Ksyn of the synchronous power supply and the circulating current coefficient Kasy of the asynchronous reactive power supply are relatively large, under the action of closed-loop control, the steady-state deviation will approach zero. Finally, the reactive current Iqasy of the asynchronous reactive power supply is made equal to the reactive current Iqsyn of the synchronous power supply, so that the reactive current Iqsyn of the synchronous power supply and the reactive current Iqasy of the asynchronous reactive power supply converge, thereby realizing the process of suppressing reactive circulating current.

[0047] The embodiment of the present invention provides another power supply coordinated operation control method to further solve the transient voltage support problem in a dual power supply system. Figure 5 A flowchart of another power supply coordinated operation control method provided by an embodiment of the present invention is shown in FIG. Figure 5 As shown, the power supply coordinated operation control method further includes:

[0048] S210: Obtain the terminal voltage of the asynchronous reactive power source.

[0049] Among them, the terminal voltage of the asynchronous reactive power supply is the voltage generated by the asynchronous reactive power supply. When the reactive current of the asynchronous reactive power supply and the reactive current of the asynchronous reactive power supply are input into the second control loop to correct the reactive current of the asynchronous reactive power supply, the control logic of this part is based on the high-voltage side voltage control of the asynchronous reactive source, and the inner loop is based on reactive power control. However, due to communication reasons, the reactive power instruction transmission process will produce some delays and cannot support transient voltage drops or transient overvoltages in the first time. To solve this part of the problem, a transient support strategy for asynchronous reactive sources is proposed to improve the transient voltage support capability. By obtaining the terminal voltage of the asynchronous reactive power supply, a third control loop can be established based on the terminal voltage of the asynchronous reactive power supply and the transfer function of the voltage control loop in the asynchronous reactive power supply to achieve rapid voltage support when the voltage drop or rise is quickly detected, thereby improving the transient voltage support capability.

[0050] S220: Establish a third control loop according to the terminal voltage of the asynchronous reactive power supply and the transfer function of the voltage control loop in the asynchronous reactive power supply.

[0051] Specifically, Figure 6 The control principle diagram of the third control loop provided by the embodiment of the present invention is as follows: Figure 6 As shown, Utasy is the terminal voltage of the asynchronous reactive power supply, U(PI) is the transfer function of the voltage control loop in the asynchronous reactive power supply, and Iqref is the second reactive reference value of the asynchronous reactive power supply, which is also the reactive current reference value of the asynchronous reactive power supply. In the third control loop, the voltage control value is obtained by subtracting the terminal voltage Utasy of the asynchronous reactive power supply from the voltage Utref of the high-voltage bus. The voltage control value is substituted into the transfer function U(PI) of the voltage control loop in the asynchronous reactive power supply for calculation to obtain the second reactive reference value Iqref of the asynchronous reactive power supply. The second reactive reference value Iqref of the asynchronous reactive power supply is used to control the operation of the asynchronous reactive power supply to correct the reactive current of the asynchronous reactive power supply.

[0052] S230. When the voltage of the high-voltage bus is within the first preset range, the reactive current of the asynchronous reactive power supply is corrected through the second control loop; when the voltage of the high-voltage bus is not within the first preset range, the terminal voltage of the asynchronous reactive power supply and the voltage of the high-voltage bus are input into the third control loop, and the reactive current of the asynchronous reactive power supply is corrected through the third control loop.

[0053] Optionally, when the voltage of the high-voltage bus is within a first preset range, the reactive current of the asynchronous reactive power supply is corrected through the second control loop; when the voltage of the high-voltage bus is not within the first preset range, the terminal voltage of the asynchronous reactive power supply and the voltage of the high-voltage bus are input into a third control loop, and the reactive current of the asynchronous reactive power supply is corrected through the third control loop, including:

[0054] When the per-unit value UH of the voltage of the high-voltage bus satisfies: 0.9pu≤UH≤1.1pu, the second control loop corrects the reactive current of the asynchronous reactive power supply; when the per-unit value UH of the voltage of the high-voltage bus satisfies: UH>1.1pu and UH<0.9pu, the third control loop corrects the reactive current of the asynchronous reactive power supply.

[0055] The first preset range is 0.9pu≤UH≤1.1pu.

[0056] Specifically, pu stands for per-unit value, which is the ratio of the measured value to the reference value. When the per-unit value UH of the high-voltage bus voltage satisfies: 0.9pu≤UH≤1.1pu, Figure 4 The steady-state control logic of the second control loop shown in the figure controls the asynchronous reactive power supply, and the second control loop corrects the reactive current of the asynchronous reactive power supply. When the per-unit value (UH) of the high-voltage bus voltage satisfies the following conditions: UH > 1.1 pu and UH < 0.9 pu, the third control loop corrects the reactive current of the asynchronous reactive power supply. Because the terminal voltage (Utasy) of the asynchronous reactive power supply can be directly detected through a voltage transformer, voltage drops or increases can be quickly detected, achieving rapid voltage support. The control logic of the third control loop mainly includes a voltage control loop and a reactive current control loop. Compared with the second control loop, the third control loop has fewer control layers and can more quickly sense rapid changes in the per-unit value (UH) of the high-voltage bus voltage, thereby improving the transient voltage support capability of the dual-power system.

[0057] Furthermore, in order to further solve the oscillation lockout problem in the dual power supply system, another power supply coordinated operation control method is provided. Figure 7 A flowchart of another power supply coordinated operation control method provided by an embodiment of the present invention is provided. Figure 8 A control principle diagram of another power supply coordinated operation control method provided by an embodiment of the present invention is shown as follows: Figure 7 As shown, the power supply coordinated operation control method further includes:

[0058] S310 : When subsynchronous oscillation is detected in the dual power supply system, add bandpass filter blocks to the input ends of the first control loop, the second control loop, and the third control loop.

[0059] Among them, the topological structures of the first control loop, the second control loop and the third control loop have the risk of causing subsynchronous oscillation or supersynchronous oscillation in the dual power supply system. During the subsynchronous oscillation, Figure 2 and Figure 3 The logic in the circuit does not need to participate in the oscillation to avoid the expansion of the oscillation. The way to achieve decoupling from the oscillation is to decouple the oscillating components in the reactive current, reactive power, and voltage, and maintain the voltage control function in other frequency bands.

[0060] Specifically, refer to Figure 8 , is the bandpass filter parameter in the bandpass filter block, and the cutoff frequency can be adjusted as needed to filter out subsynchronous oscillation or supersynchronous oscillation components, where s is the Laplace operator, T B and T C They are all preset time quantities related to time. The reactive measurement component, voltage measurement component, and reactive current component of the first control loop, the second control loop, and the third control loop are all preceded by corresponding band-pass filtering links to achieve decoupling from the subsynchronous oscillation component and the supersynchronous oscillation component. This control logic can be used during the occurrence of subsynchronous oscillation, does not participate in the oscillation event, and maintains the fundamental voltage and reactive power constant.

[0061] S320. Filter out subsynchronous oscillation components or supersynchronous oscillation components in the input values ​​input to the first control loop, the second control loop, and the third control loop through a bandpass filter block; wherein the bandpass filter block is provided with a bandpass filter parameter, and the input values ​​entering the first control loop, the second control loop, and the third control loop need to be multiplied by the bandpass filter parameter.

[0062] Specifically, a bandpass filter block is set at the front end of the first control loop, the second control loop and the third control loop. The bandpass filter block is provided with a bandpass filter parameter. The input values ​​entering the first control loop, the second control loop and the third control loop need to be multiplied by the bandpass filter parameter. The bandpass filter parameter can be adjusted as needed. The subsynchronous oscillation component or supersynchronous oscillation component in the input value input to the first control loop, the second control loop and the third control loop is filtered out by the bandpass filter block, thereby solving the oscillation lockout problem in the existing control scheme, realizing voltage steady-state support under real-time subsynchronous oscillation events, and avoiding further expansion of subsynchronous oscillation accidents.

[0063] In the embodiment of the present invention, the existing voltage control system is fully utilized to design a control method suitable for the parallel operation of synchronous power supplies and asynchronous reactive power supplies, which provides a feasible technical idea for actually solving the reactive power distribution and voltage balance of the system containing synchronous power supplies and asynchronous reactive power supplies in parallel. According to the reasonable control logic corresponding to different working conditions of steady state, transient and subsynchronous oscillation, the stable control requirements under different demands are realized, and long-term stable operation can be achieved without increasing equipment investment. The system can achieve stable operation at a relatively low cost and has enhanced transient impact resistance.

[0064] The embodiments of the present invention can solve three types of problems at the same time: first, it can solve the problem of reactive circulating current; second, it can support the transient voltage problem; third, it can solve the oscillation lockout problem. It can adapt to various working conditions such as high and low voltage ride-through, steady-state voltage control, and locked oscillation, so that the system can cope with the influence of large and small disturbances, has the characteristics of long-term reliability, and realizes the coordinated operation control of synchronous power supply and non-synchronous reactive power supply.

[0065] The embodiment of the present invention also provides a power supply coordinated operation control system, Figure 9 FIG. 1 is a schematic diagram of the structure of a power supply coordinated operation control system in an embodiment of the present invention. The power supply coordinated operation control system in an embodiment of the present invention is used to execute the power supply coordinated operation control method in any embodiment of the present invention, such as Figure 9 As shown, the power supply coordinated operation control system includes:

[0066] The acquisition module 110 is configured to acquire the voltage of the high-voltage bus, the reactive current of the synchronous power supply, and the reactive current of the asynchronous reactive power supply.

[0067] The control establishing module 120 is configured to establish a first control loop based on the circulating current coefficient of the synchronous power supply and the voltage of the high-voltage bus, and to establish a second control loop based on the circulating current coefficient of the asynchronous reactive power supply and the voltage of the high-voltage bus.

[0068] The control module 130 is configured to input the reactive current of the synchronous power supply and the reactive current of the asynchronous reactive power supply into a first control loop to correct the reactive current of the synchronous power supply, and input the reactive current of the asynchronous reactive power supply and the reactive current of the asynchronous reactive power supply into a second control loop to correct the reactive current of the asynchronous reactive power supply until the reactive current of the synchronous power supply and the reactive current of the asynchronous reactive power supply are equal.

[0069] Specifically, after acquiring the voltage of the high-voltage bus, the reactive current of the synchronous power supply, and the reactive current of the non-synchronous reactive power supply, the acquisition module 110 sends them to the control establishment module 120. The control establishment module 120 establishes a first control loop based on the circulating current coefficient of the synchronous power supply and the voltage of the high-voltage bus, and establishes a second control loop based on the circulating current coefficient of the non-synchronous reactive power supply and the voltage of the high-voltage bus. The first control loop and the second control loop are as follows: Figure 3 and Figure 4 As shown in . Based on the first control loop and the second control loop, the control module 130 inputs the reactive current of the synchronous power supply and the reactive current of the asynchronous reactive power supply into the first control loop to correct the reactive current of the synchronous power supply, and inputs the reactive current of the asynchronous reactive power supply and the reactive current of the asynchronous reactive power supply into the second control loop to correct the reactive current of the asynchronous reactive power supply, thereby forming a closed-loop control. Under the action of the closed-loop control, the reactive current of the synchronous power supply and the reactive current of the asynchronous reactive power supply are equal, thereby achieving the process of suppressing reactive circulating current in the dual power supply system. The present invention realizes the parallel operation of the synchronous power supply and the asynchronous reactive power supply, and solves the reactive circulating current problem when the synchronous power supply and the asynchronous reactive power supply are operated in parallel.

[0070] An embodiment of the present invention provides a power supply coordinated operation control system. An acquisition module of the power supply coordinated operation control system acquires the voltage of the high-voltage bus, the reactive current of the synchronous power supply, and the reactive current of the asynchronous reactive power supply. A control establishment module establishes a first control loop based on the circulating current coefficient of the synchronous power supply and the voltage of the high-voltage bus, and a second control loop based on the circulating current coefficient of the asynchronous reactive power supply and the voltage of the high-voltage bus. The control module inputs the reactive current of the synchronous power supply and the reactive current of the asynchronous reactive power supply into the first control loop to correct the reactive current of the synchronous power supply, and inputs the reactive current of the asynchronous reactive power supply and the reactive current of the asynchronous reactive power supply into the second control loop to correct the reactive current of the asynchronous reactive power supply, thereby forming a closed-loop control. Under the closed-loop control, the reactive current of the synchronous power supply and the reactive current of the asynchronous reactive power supply are equalized, thereby suppressing the reactive circulating current in the dual power supply system. This embodiment of the present invention enables parallel operation of synchronous and asynchronous reactive power supplies and solves the problem of reactive circulating current during parallel operation of synchronous and asynchronous reactive power supplies.

[0071] Optional, Figure 10 Schematic diagram of another power supply coordinated operation control system in an embodiment of the present invention, wherein the acquisition module 110 is further configured to acquire the terminal voltage of the asynchronous reactive power supply; the control establishment module 120 is further configured to establish a third control loop based on the terminal voltage of the asynchronous reactive power supply and the transfer function of the voltage control loop in the asynchronous reactive power supply; Figure 10 As shown, the power supply coordinated operation control system also includes:

[0072] The control selection module 140 is used to correct the reactive current of the asynchronous reactive power supply through the second control loop when the voltage of the high-voltage bus is within the first preset range; when the voltage of the high-voltage bus is not within the first preset range, input the terminal voltage of the asynchronous reactive power supply and the voltage of the high-voltage bus into the third control loop, and correct the reactive current of the asynchronous reactive power supply through the third control loop.

[0073] Optionally, when the per-unit value UH of the voltage of the high-voltage bus satisfies: 0.9pu≤UH≤1.1pu, the second control loop corrects the reactive current of the asynchronous reactive power supply; when the per-unit value UH of the voltage of the high-voltage bus satisfies: UH>1.1pu and UH<0.9pu, the third control loop corrects the reactive current of the asynchronous reactive power supply.

[0074] The first preset range is 0.9pu≤UH≤1.1pu.

[0075] Specifically, pu stands for per-unit value, which is the ratio of the measured value to the reference value. When the per-unit value UH of the high-voltage bus voltage satisfies: 0.9pu≤UH≤1.1pu, Figure 4The steady-state control logic of the second control loop shown in the figure controls the asynchronous reactive power supply, and the second control loop corrects the reactive current of the asynchronous reactive power supply. When the per-unit value (UH) of the high-voltage bus voltage satisfies the following conditions: UH > 1.1 pu and UH < 0.9 pu, the third control loop corrects the reactive current of the asynchronous reactive power supply. Because the terminal voltage (Utasy) of the asynchronous reactive power supply can be directly detected through a voltage transformer, voltage drops or increases can be quickly detected, achieving rapid voltage support. The control logic of the third control loop mainly includes a voltage control loop and a reactive current control loop. Compared with the second control loop, the third control loop has fewer control layers and can more quickly sense rapid changes in the per-unit value (UH) of the high-voltage bus voltage, thereby improving the transient voltage support capability of the dual-power system.

[0076] Optional, Figure 11 FIG. 1 is a schematic diagram of the structure of the third control loop in an embodiment of the present invention, as shown in FIG. Figure 11 As shown, the third control loop includes a voltage control loop 201 and a reactive current control loop 202; the first input end of the voltage control loop 201 is connected to the voltage Utref of the high-voltage bus, the second input end of the voltage control loop 201 is connected to the terminal voltage Utasy of the asynchronous reactive power supply, and the output end of the voltage control loop 201 is connected to the input end of the reactive current control loop 202.

[0077] The voltage control loop 201 is used to subtract the terminal voltage Utasy of the asynchronous reactive power supply from the voltage Utref of the high-voltage bus to obtain a voltage control value, and send the voltage control value to the reactive current control loop 202; the reactive current control loop 202 is used to substitute the voltage control value into the transfer function U(PI) of the voltage control loop in the asynchronous reactive power supply for calculation, and obtain the second reactive reference value Iqref of the asynchronous reactive power supply.

[0078] The second reactive reference value Iqref of the asynchronous reactive power supply is used to control the operation of the asynchronous reactive power supply to correct the reactive current of the asynchronous reactive power supply.

[0079] Specifically, Utasy is the terminal voltage of the asynchronous reactive power supply, U(PI) is the transfer function of the voltage control loop in the asynchronous reactive power supply, and Iqref is the second reactive reference value of the asynchronous power supply, which is also the reactive current reference value of the asynchronous power supply. The second reactive reference value Iqref of the asynchronous reactive power supply can be obtained through the third control loop to control the operation of the asynchronous reactive power supply and correct the reactive current of the asynchronous reactive power supply. The control logic of the third control loop mainly includes a voltage control loop and a reactive current control loop. Compared with the second control loop, the third control loop has fewer control layers and can more quickly sense the rapid changes in the per-unit value UH of the voltage of the high-voltage bus, thereby improving the transient voltage support capability of the dual power supply system.

[0080] Optional, Figure 12 is a schematic structural diagram of the first control loop in an embodiment of the present invention, Figure 13 FIG. 1 is a schematic diagram of the structure of the second control loop in an embodiment of the present invention. Figure 12 and Figure 13 As shown, the first control loop includes a first high voltage control loop 301 , a first reactive power control loop 302 and a first reactive current control loop 303 .

[0081] The first input end of the first high-voltage voltage control loop 301 is connected to the reactive current Iqsyn of the synchronous power supply, the first correction end of the first high-voltage voltage control loop 301 is connected to the reactive current Iqasy of the asynchronous reactive power supply, and the output end of the first high-voltage voltage control loop 301 is connected to the first input end of the first reactive control loop 302; the second input end of the first reactive control loop 302 is connected to the voltage Uhref of the high-voltage bus, the third input end of the first reactive control loop 302 is connected to the machine-end voltage Utsyn of the synchronous power supply, and the output end of the first reactive control loop 302 is connected to the input end of the first reactive current control loop 303.

[0082] The first high-voltage voltage control loop 301 is used to obtain a first intermediate value by subtracting the reactive current Iqsyn of the synchronous power supply from the reactive current Iqasy of the non-synchronous reactive power supply, and multiplying the first intermediate value by the circulating current coefficient Ksyn of the synchronous power supply to obtain a first voltage control value; the first reactive power control loop 302 is used to add the first voltage control value to the voltage of the high-voltage bus and subtract the terminal voltage of the synchronous power supply to obtain a reactive control value; the first reactive current control loop 303 is used to input the reactive control value into the excitation control system of the synchronous power supply to obtain the reactive reference value Efd of the synchronous power supply; wherein the reactive reference value Efd of the synchronous power supply is used to control the operation of the synchronous power supply to correct the reactive current of the synchronous power supply.

[0083] The second control loop includes a second high-voltage voltage control loop 401, a second reactive power control loop 402 and a second reactive current control loop 403; the first input end of the second high-voltage voltage control loop 401 is connected to the reactive current Iqsyn of the synchronous power supply, the first correction end of the second high-voltage voltage control loop 401 is connected to the reactive current Iqasy of the asynchronous reactive power supply, and the output end of the second high-voltage voltage control loop 401 is connected to the first input end of the second reactive power control loop 402; the second input end of the second reactive power control loop 402 is connected to the voltage Uhref of the high-voltage bus, the third input end of the second reactive power control loop 402 is connected to the per-unit value UH of the voltage of the high-voltage bus, and the output end of the second reactive power control loop 402 is connected to the input end of the second reactive current control loop 403.

[0084] The second high-voltage voltage control loop 401 is used to subtract the reactive current Iqasy of the asynchronous reactive power supply from the reactive current Iqsyn of the synchronous power supply to obtain a second intermediate value, and multiply the second intermediate value by the circulating current coefficient Kasy of the asynchronous reactive power supply to obtain a second voltage control value; the second reactive power control loop 402 is used to add the second voltage control value to the voltage of the high-voltage bus and subtract the per-unit value UH of the voltage of the high-voltage bus to obtain a second reactive control value; the second reactive current control loop 403 is used to multiply the second reactive control value by the automatic voltage control coefficient KAVC of the asynchronous reactive power supply to obtain a first reactive reference value Qasyref of the asynchronous reactive power supply; wherein, the first reactive reference value Qasyref of the asynchronous reactive power supply is used to control the operation of the asynchronous reactive power supply to correct the reactive current of the asynchronous reactive power supply.

[0085] Specifically, refer to Figure 12 and Figure 13 , Iqasy is the reactive current of the non-synchronous reactive power supply, Iqsyn is the reactive current of the synchronous power supply, Uhref is the voltage of the high-voltage bus, also known as the voltage reference value on the high-voltage side, Utasy is the terminal voltage of the non-synchronous reactive power supply, Ksyn is the circulating current coefficient of the synchronous power supply, Kasy is the circulating current coefficient of the non-synchronous reactive power supply, Utsyn is the terminal voltage of the synchronous power supply, AVR is the local control loop of the synchronous power supply, KAVC is the automatic voltage control coefficient of the non-synchronous power supply, Efd is the reactive reference value of the synchronous power supply, and Qasyref is the first reactive reference value of the non-synchronous reactive power supply. In the first control loop, the reactive current Iqsyn of the synchronous power supply and the reactive current Iqasy of the non-synchronous power supply are input into the first control loop. The reactive current Iqsyn of the synchronous power supply is subtracted from the reactive current Iqasy of the non-synchronous power supply to obtain a first intermediate value. This first intermediate value is multiplied by the circulating current coefficient Ksyn of the synchronous power supply to obtain a first voltage control value. The first voltage control value is added to the voltage Uhref of the high-voltage bus and the terminal voltage of the synchronous power supply is subtracted to obtain a reactive power control value. This reactive power control value is input into the local control loop AVR of the synchronous power supply's excitation control system. Finally, the reactive power reference value Efd of the synchronous power supply is obtained from the input of the first control loop. The operation of the synchronous power supply is controlled by the reactive power reference value of the synchronous power supply to correct its reactive current. Because the circulating current coefficient Ksyn of the synchronous power supply and the circulating current coefficient Kasy of the non-synchronous power supply are relatively large, the steady-state deviation approaches zero under the closed-loop control. Finally, the reactive current Iqasy of the asynchronous reactive power supply is made equal to the reactive current Iqsyn of the synchronous power supply, so that the reactive current Iqsyn of the synchronous power supply and the reactive current Iqasy of the asynchronous reactive power supply converge, thereby realizing the process of suppressing reactive circulating current.

[0086] In addition, the power supply coordinated operation control system of the embodiment of the present invention includes but is not limited to the above modules. The power supply coordinated operation control system of the embodiment of the present invention can adaptively set relevant functional modules according to the power supply coordinated operation control method in any embodiment of the present invention to achieve the function and technical effect of the power supply coordinated operation control method in any embodiment of the present invention.

[0087] The power supply coordinated operation control system in the embodiment of the present invention makes full use of the existing voltage control system and designs a control system that is suitable for the parallel operation of synchronous power supplies and asynchronous reactive power supplies. It provides a feasible technical idea for actually solving the reactive power distribution and voltage balance of the system containing synchronous power supplies and asynchronous reactive power supplies in parallel. It designs corresponding reasonable control logic according to different working conditions such as steady state, transient and subsynchronous oscillation to achieve stable control requirements under different demands. It can achieve long-term stable operation without increasing equipment investment, realize system stable operation at a lower cost, and have enhanced transient impact resistance.

[0088] The power supply coordinated operation control system of the embodiment of the present invention can solve three types of problems at the same time. First, it can solve the reactive circulating current problem; second, it can support the transient voltage problem; third, it can solve the oscillation lockout problem. It can adapt to various working conditions such as high and low voltage crossing, steady-state voltage control, and locked oscillation, so that the system can cope with the influence of large and small disturbances, has the characteristics of long-term reliability, and realizes the coordinated operation of controlling synchronous power supply and non-synchronous reactive power supply.

[0089] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A power supply coordinated operation control method, characterized in that: The power supply coordinated operation control method is used to control a dual power supply system, wherein the dual power supply system includes a synchronous power supply and an asynchronous reactive power supply, wherein both the synchronous power supply and the asynchronous reactive power supply are connected to a high-voltage bus, and the power supply coordinated operation control method includes: Acquiring the voltage of the high-voltage bus, the reactive current of the synchronous power supply, and the reactive current of the asynchronous reactive power supply; A first control loop is established based on the circulating current coefficient of the synchronous power supply and the voltage of the high-voltage bus, and a second control loop is established based on the circulating current coefficient of the non-synchronous reactive power supply and the voltage of the high-voltage bus; The reactive current of the synchronous power supply and the reactive current of the asynchronous reactive power supply are input into the first control loop to correct the reactive current of the synchronous power supply, and the reactive current of the asynchronous reactive power supply and the reactive current of the asynchronous reactive power supply are input into the second control loop to correct the reactive current of the asynchronous reactive power supply until the reactive current of the synchronous power supply and the reactive current of the asynchronous reactive power supply are equal.

2. The power supply coordinated operation control method according to claim 1, characterized in that: Also includes: Obtaining the terminal voltage of the asynchronous reactive power source; Establishing a third control loop according to the terminal voltage of the non-synchronous reactive power source and a transfer function of a voltage control loop in the non-synchronous reactive power source; When the voltage of the high-voltage bus is within a first preset range, the reactive current of the non-synchronous reactive power supply is corrected by the second control loop; when the voltage of the high-voltage bus is not within the first preset range, the terminal voltage of the non-synchronous reactive power supply and the voltage of the high-voltage bus are input into the third control loop, and the reactive current of the non-synchronous reactive power supply is corrected by the third control loop.

3. The power supply coordinated operation control method according to claim 2, characterized in that: When the voltage of the high-voltage bus is within a first preset range, the reactive current of the non-synchronous reactive power supply is corrected by the second control loop; when the voltage of the high-voltage bus is not within the first preset range, the terminal voltage of the non-synchronous reactive power supply and the voltage of the high-voltage bus are input into the third control loop, and the reactive current of the non-synchronous reactive power supply is corrected by the third control loop, including: When the per-unit value UH of the voltage of the high-voltage bus satisfies: 0.9pu≤UH≤1.1pu, the reactive current of the non-synchronous reactive power source is corrected by the second control loop; When the per-unit value UH of the voltage of the high-voltage bus satisfies: UH>1.1pu and UH<0.9pu, the reactive current of the asynchronous reactive power source is corrected by the third control loop.

4. The power supply coordinated operation control method according to claim 2, characterized in that: Also includes: When subsynchronous oscillation occurs in the dual power supply system, a bandpass filter block is added to the input ends of the first control loop, the second control loop and the third control loop; filtering out subsynchronous oscillation components or supersynchronous oscillation components in input values ​​input to the first control loop, the second control loop, and the third control loop by the bandpass filter block; The bandpass filter block is provided with a bandpass filter parameter, and the input values ​​entering the first control loop, the second control loop and the third control loop need to be multiplied by the bandpass filter parameter.

5. The power supply coordinated operation control method according to claim 1, characterized in that: Inputting the reactive current of the synchronous power supply and the reactive current of the non-synchronous reactive power supply into the first control loop to correct the reactive current of the synchronous power supply includes: Inputting the reactive current of the synchronous power supply as an input value to the input end of the first control loop, inputting the reactive current of the non-synchronous reactive power supply as a correction value to the first correction end of the first control loop, and obtaining the reactive reference value of the synchronous power supply from the input end of the first control loop; The operation of the synchronous power supply is controlled by a reactive reference value of the synchronous power supply to correct the reactive current of the synchronous power supply.

6. The power supply coordinated operation control method according to claim 1, characterized in that: Inputting the reactive current of the asynchronous reactive power supply and the reactive current of the asynchronous reactive power supply into the second control loop to correct the reactive current of the asynchronous reactive power supply comprises: Inputting the reactive current of the non-synchronous reactive power source as an input value to the input end of the second control loop, inputting the reactive current of the synchronous power source as a correction value to the first correction end of the second control loop, and obtaining a first reactive reference value of the non-synchronous reactive power source from the input end of the second control loop; The operation of the non-synchronous reactive power source is controlled by a first reactive reference value of the non-synchronous reactive power source to correct the reactive current of the non-synchronous reactive power source.

7. A power supply coordinated operation control system, characterized in that: The power supply coordinated operation control system is used to execute the power supply coordinated operation control method according to any one of claims 1 to 6 above, and the power supply coordinated operation control system includes: An acquisition module, used for acquiring the voltage of the high-voltage bus, the reactive current of the synchronous power supply and the reactive current of the asynchronous reactive power supply; A control establishment module, configured to establish a first control loop based on the circulating current coefficient of the synchronous power supply and the voltage of the high-voltage bus, and to establish a second control loop based on the circulating current coefficient of the non-synchronous reactive power supply and the voltage of the high-voltage bus; A control module is used to input the reactive current of the synchronous power supply and the reactive current of the asynchronous reactive power supply into the first control loop to correct the reactive current of the synchronous power supply, and input the reactive current of the asynchronous reactive power supply and the reactive current of the asynchronous reactive power supply into the second control loop to correct the reactive current of the asynchronous reactive power supply until the reactive current of the synchronous power supply and the reactive current of the asynchronous reactive power supply are equal.

8. The power supply coordinated operation control system according to claim 7, characterized in that: The acquisition module is also used to acquire the terminal voltage of the asynchronous reactive power supply; the control establishment module is also used to establish a third control loop according to the terminal voltage of the asynchronous reactive power supply and the transfer function of the voltage control loop in the asynchronous reactive power supply; The power supply coordinated operation control system also includes: A control selection module is used to correct the reactive current of the non-synchronous reactive power supply through the second control loop when the voltage of the high-voltage bus is within a first preset range; when the voltage of the high-voltage bus is not within the first preset range, input the terminal voltage of the non-synchronous reactive power supply and the voltage of the high-voltage bus into the third control loop, and correct the reactive current of the non-synchronous reactive power supply through the third control loop.

9. The power supply coordinated operation control system according to claim 8, characterized in that: The third control loop includes a voltage control loop and a reactive current control loop; The first input end of the voltage control loop is connected to the voltage of the high-voltage bus, the second input end of the voltage control loop is connected to the terminal voltage of the non-synchronous reactive power supply, and the output end of the voltage control loop is connected to the input end of the reactive current control loop; The voltage control loop is used to obtain a voltage control value by subtracting the terminal voltage of the non-synchronous reactive power supply from the voltage of the high-voltage bus, and send the voltage control value to the reactive current control loop; The reactive current control loop is used to substitute the voltage control value into the transfer function of the voltage control loop in the asynchronous reactive power supply for calculation, so as to obtain a second reactive reference value of the asynchronous reactive power supply; The second reactive reference value of the asynchronous reactive power supply is used to control the operation of the asynchronous reactive power supply to correct the reactive current of the asynchronous reactive power supply.

10. The power supply coordinated operation control system according to claim 7, characterized in that: The first control loop includes a first high voltage voltage control loop, a first reactive power control loop and a first reactive current control loop; The first input end of the first high-voltage voltage control loop is connected to the reactive current of the synchronous power supply, the first correction end of the first high-voltage voltage control loop is connected to the reactive current of the non-synchronous reactive power supply, and the output end of the first high-voltage voltage control loop is connected to the first input end of the first reactive control loop; The second input end of the first reactive control loop is connected to the voltage of the high-voltage bus, the third input end of the first reactive control loop is connected to the terminal voltage of the synchronous power supply, and the output end of the first reactive control loop is connected to the input end of the first reactive current control loop; The first high-voltage voltage control loop is used to obtain a first intermediate value by subtracting the reactive current of the synchronous power supply from the reactive current of the non-synchronous reactive power supply, and to obtain a first voltage control value by multiplying the first intermediate value by the circulating current coefficient of the synchronous power supply; the first reactive control loop is used to obtain a reactive control value by adding the first voltage control value to the voltage of the high-voltage bus and subtracting the terminal voltage of the synchronous power supply; the first reactive current control loop is used to input the reactive control value into the excitation control system of the synchronous power supply to obtain a reactive reference value of the synchronous power supply; wherein the reactive reference value of the synchronous power supply is used to control the operation of the synchronous power supply to correct the reactive current of the synchronous power supply; The second control loop includes a second high-voltage voltage control loop, a second reactive control loop and a second reactive current control loop; the first input end of the second high-voltage voltage control loop is connected to the reactive current of the synchronous power supply, the first correction end of the second high-voltage voltage control loop is connected to the reactive current of the non-synchronous reactive power supply, and the output end of the second high-voltage voltage control loop is connected to the first input end of the second reactive control loop; the second input end of the second reactive control loop is connected to the voltage of the high-voltage bus, the third input end of the second reactive control loop is connected to the per-unit value of the voltage of the high-voltage bus, and the output end of the second reactive control loop is connected to the input end of the second reactive current control loop; The second high-voltage voltage control loop is used to obtain a second intermediate value by subtracting the reactive current of the asynchronous reactive power supply from the reactive current of the synchronous power supply, and multiplying the second intermediate value by the circulating current coefficient of the asynchronous reactive power supply to obtain a second voltage control value; the second reactive control loop is used to add the second voltage control value to the voltage of the high-voltage bus and subtract the per-unit value of the voltage of the high-voltage bus to obtain a second reactive control value; the second reactive current control loop is used to multiply the second reactive control value by the automatic voltage control coefficient of the asynchronous power supply to obtain a first reactive reference value of the asynchronous reactive power supply; wherein the first reactive reference value of the asynchronous reactive power supply is used to control the operation of the asynchronous reactive power supply to correct the reactive current of the asynchronous reactive power supply.

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