Inverter operation refusal control method and system

Abstract

The embodiment of the invention discloses an inverter operation refusal control method and system, and belongs to the technical field of power generation, power transformation or power distribution, and the method comprises the steps: carrying out the communication interaction between a power control system and an inverter, carrying out the corresponding setting of a remote regulation state bit, an operation refusal state bit and a communication link state register, carrying out the analysis of a service interaction message, and carrying out the operation refusal of the inverter; and performing corresponding adjustment on a remote adjustment status bit of the power control system, and executing corresponding operation according to the remote adjustment selection message, the remote adjustment execution message and the confirmation frame. According to the embodiment of the invention, full-period monitoring is carried out on the operation refusing state of the inverter, when the operation refusing state is judged, the wake-up logic carries out deeper-level operation refusing state analysis in the operation refusing state, the core logic is adjusted according to different states, and the level of the full-field active power control capability of the photovoltaic power station is ensured; the problem that the whole-field active power control capability is reduced due to the problems of communication, inverter single body faults and the like is solved.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to an inverter control method and system, and belongs to the technical field of power generation, power transformation or power distribution. BACKGROUND

[0002] With the increasing proportion of photovoltaic power stations in power stations, the "double high" characteristics of high proportion of photovoltaic power stations and high proportion of power electronic equipment in regional power grids are obvious. The stability mechanism of the power system has changed significantly with the increase of the "double high" characteristics, from the previous large and concentrated power supply points to the current small and dispersed power supply points. These changes have brought many risks and challenges to the safe and stable operation of the power grid, such as active power fluctuation, voltage instability, etc.

[0003] The AGC device is used in the photovoltaic power station to accurately control the active power. In the active power regulation process, when the communication of the inverter is interrupted or the control logic of the inverter itself is imperfect, the phenomenon of single inverter control refusal will occur. When single inverter control refusal occurs, it will have a subtle impact on the active power control of the whole station. When the number of refused inverters exceeds a certain number, the active power control rate and control accuracy of the whole station will decrease significantly, thereby affecting the safe and stable operation of the power grid.

[0004] The common method used by the prior art to solve the above problem is:

[0005] When single inverter refusal occurs, the participation permission of the refused inverter is exited, and the participation instruction of the refused inverter is evenly distributed to the normally participating inverters. This method needs to perform one or two rounds of control adjustment to determine the inverter refusal. During this period, the control rate and control accuracy will be affected to a certain extent. When the proportion of refused inverters exceeds 20%, the active power control ability of the whole station will decrease significantly.

[0006] There are multiple factors that cause the inverter to refuse, such as inverter body failure, high temperature or reduced insulation impedance, the inverter will refuse to execute the active power climbing instruction; the loss of frame in the network layer of the communication level, the discontinuity of the service message sequence number, which will cause the failure of the control command, will also be manifested as inverter refusal; in the serial communication level, too many polling messages in the bus type communication will cause the control command to be delayed, which will also be considered as inverter refusal.

[0007] However, the existing defects in the prior art are that when the inverter refuses, the participation permission is directly exited without exploring the deep reasons for the inverter refusal, so that the method of triggering and awakening according to the specific reasons cannot be triggered, causing the decrease of the active power control ability of the whole station. There is no corresponding solution to solve this problem in the prior art, which cannot meet people's needs and needs to be improved. SUMMARY

[0008] The embodiment of the present application aims to provide an inverter refusal control method and system, aiming at the problem of active power control capability decline caused by inverter refusal phenomenon in the power control system of a photovoltaic power plant, and solving the defects in the prior art.

[0009] The embodiment of the present application provides the following scheme:

[0010] According to one aspect of the embodiment of the present application, an inverter refusal control method is provided, which comprises: a power control system communicates with an inverter, the power control system detects whether a remote control confirmation frame sent back by the inverter is received, and corresponding settings are made to a remote control state bit and a communication link state register according to the result of detecting the remote control confirmation frame; the power control system analyzes a remote control message fed back by the inverter in the process of communication interaction, detects the instruction feedback of the inverter according to the analysis result of the remote control message, and makes corresponding adjustment to the remote control state bit of the inverter according to the instruction feedback of the inverter; for the inverter marked with remote control refusal, the power control system sends a remote control selection message and a remote control execution message to the inverter, the inverter sends back a corresponding confirmation frame, the current state of the inverter is confirmed through communication interaction, and an operation of canceling the remote control refusal state of the inverter is performed, or: if the inverter does not send back the corresponding remote control selection message confirmation frame and remote control execution message confirmation frame, alarm information related to inverter refusal is pushed.

[0011] According to at least one specific embodiment of the present application, the power control system communicates with the inverter, the power control system detects whether a remote control confirmation frame sent back by the inverter is received, and corresponding settings are made to a remote control state bit and a communication link state register according to the result of detecting the remote control confirmation frame, further comprising: the power control system completes instruction distribution, sends a corresponding first remote control message to the inverter, the inverter acquires the first remote control message and feeds back a corresponding remote control confirmation frame, the power control system acquires the remote control confirmation frame, and sets the remote control state bit to a remote control success state, or: if the power control system does not receive the remote control confirmation frame corresponding to the first remote control message, communication link state detection is performed, if the interaction message is interrupted, the communication link state register is set to a communication interruption state, if the interaction message is normal, a second remote control message is issued; if the power control system receives the remote control confirmation frame corresponding to the second remote control message, the remote control state bit is set to a remote control success state, or: if the power control system does not receive the remote control confirmation frame corresponding to the second remote control message, the remote control state bit is set to a remote control refusal state.

[0012] According to at least one of the embodiments of the present application, in the process that the power control system detects whether the remote control confirmation frame sent back by the inverter is received, the power control system sets the remote control state position as a remote control success state, and detects the instruction remote feedback value in the remote control message.

[0013] According to at least one of the embodiments of the present application, the power control system analyzes the remote control message fed back by the inverter in the communication interaction process, detects the instruction feedback of the inverter according to the analysis result of the remote control message, and adjusts the remote control state bit of the inverter correspondingly according to the instruction feedback of the inverter. Further, the power control system detects whether the single instruction remote feedback value in the remote control message sent back by the inverter is correct, determines whether the active power action of the inverter is correct, and if the single instruction remote feedback value is correct and the active power action is incorrect, determines that the inverter is in a refusal state, and sets the refusal state bit as an execution refusal state, or if the active power action is correct and the single action of the inverter is completed.

[0014] According to at least one of the embodiments of the present application, in the process that the power control system detects whether the single instruction remote feedback value in the remote control message sent back by the inverter is correct, if the single instruction remote feedback value is incorrect, the remote control message is sent again, and whether the active power action is correct is detected. If the single instruction remote feedback value returned again is incorrect, it is determined that the inverter is in a refusal state, and the refusal state bit is set as a remote control refusal state.

[0015] According to at least one of the embodiments of the present application, for the inverter marked as in a remote control refusal state, the power control system sends a remote control selection message and a remote control execution message to the inverter, the inverter sends back a corresponding confirmation frame, the current state of the inverter is confirmed through communication interaction, and the remote control refusal state of the inverter is cancelled, or if the inverter does not send back the remote control selection message confirmation frame and the remote control execution message confirmation frame, alarm information related to the inverter refusal is pushed. Further, the power control system sends the remote control selection message, the inverter sends back a remote control selection message confirmation frame reply success, the power control system sends the remote control execution message, the inverter sends back a remote control execution message confirmation frame reply success, and the remote control refusal state of the inverter is cancelled, or if the inverter does not send back the remote control selection message confirmation frame and the remote control execution message confirmation frame, the remote control control point state word in the power control system is set as a refusal.

[0016] According to at least one of the embodiments of the present application, the alarm information related to the inverter refusal is pushed, and specifically, alarm information of “determining that the inverter is in a refusal state due to remote control refusal” is pushed.

[0017] According to at least one of the embodiments of the present application, the method further comprises: performing a wake-up operation on the inverter marked as the refuse-to-operate state in one adjustment cycle, setting corresponding wake-up logic according to different refuse-to-operate states of the inverter, feeding back the refuse-to-operate state of the inverter to corresponding algorithms, and adjusting the parameter adjustment logic of the refuse-to-operate inverter according to the specific state of the different inverters.

[0018] According to at least one of the embodiments of the present application, the refuse-to-operate state set in the wake-up logic is specifically: up-regulation refuse-to-operate, deviation refuse-to-operate and absolute refuse-to-operate.

[0019] According to another aspect of the present application, an inverter refuse-to-operate control system is provided for implementing the inverter refuse-to-operate control method, comprising: a remote adjustment confirmation frame confirmation module, a power control system communicates with an inverter, the power control system detects whether a remote adjustment confirmation frame sent back by the inverter is received, and sets a remote adjustment state bit and a communication link state register according to the detection result of the remote adjustment confirmation frame; a remote adjustment state bit adjustment module, the power control system analyzes a remote adjustment message fed back by the inverter in the communication process, detects an instruction feedback of the inverter according to the analysis result of the remote adjustment message, and adjusts the remote adjustment state bit of the inverter correspondingly; a remote adjustment refuse-to-operate operation and alarm module, for the inverter marked as the remote adjustment refuse-to-operate, the power control system sends a remote adjustment selection message and a remote adjustment execution message to the inverter, the inverter sends back corresponding confirmation frames, the current state of the inverter is confirmed through the communication, and the remote adjustment refuse-to-operate state operation of the inverter is executed, or: the inverter does not send back the remote adjustment selection message confirmation frame and the remote adjustment execution message confirmation frame, and then the alarm information related to the refuse-to-operate of the inverter is pushed.

[0020] Compared with the prior art, the embodiments of the present application have the following advantages:

[0021] The embodiments of the present application monitor the refuse-to-operate state of the inverter in a whole cycle, when it is determined as the refuse-to-operate state, the wake-up logic will perform a deeper refuse-to-operate state analysis in the refuse-to-operate state, adjusts the core logic according to different states, guarantees the level of the active power control ability of the whole photovoltaic power station, and solves the problem of the decline of the active power control ability of the whole photovoltaic power station caused by the communication, inverter single fault and other problems. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0023] Figure 1 is a method flowchart of the embodiment of the present application.

[0024] Figure 2 is a system architecture diagram of the embodiment of the present application.

[0025] Figure 3 is a method flowchart of the typical specific embodiment provided by the embodiment of the present application. DETAILED DESCRIPTION

[0026] The technical solutions of the embodiments of the present application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the specific embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] As shown in Figure 1 The present application provides an inverter rejection control method, and the method steps include:

[0028] Step S1, the power control system communicates with the inverter, the power control system detects whether the remote adjustment confirmation frame sent back by the inverter is received, and the remote adjustment state bit and the communication link state register are set correspondingly according to the detection result of the remote adjustment confirmation frame. The content of step S1 involves the communication link between the power control system and the inverter, and by implementing step S1, it can be ensured that the command distribution of the power control system is correctly issued and sent back.

[0029] Step S2, the power control system analyzes the remote adjustment message fed back by the inverter in the communication interaction process, detects the command feedback of the inverter according to the analysis result of the remote adjustment message, and adjusts the remote adjustment state bit of the inverter correspondingly according to the command feedback of the inverter. In step S2, the remote adjustment state bit of the power control system is also the command state register, and the power control system monitors the output of the inverter in real time by analyzing the telemetry data, so as to ensure that the command distribution is correctly executed.

[0030] Step S3, for the inverter marked with remote adjustment rejection, the power control system sends remote adjustment selection message and remote adjustment execution message to the inverter, and the inverter returns corresponding confirmation frame, through communication interaction, the current state of the inverter is confirmed, the operation of canceling the remote adjustment rejection state of the inverter is executed, or: the inverter does not return corresponding remote adjustment selection message confirmation frame and remote adjustment execution message confirmation frame, then the alarm information related to the inverter rejection is pushed. In step S3, the power control system and the inverter interact with the message and the confirmation frame, confirm the current state of the inverter, ensure that the inverter can correctly respond to the instruction distribution, set the rejection state, or send the alarm information related to the inverter, ensure that the inverter correctly responds to the instruction distribution, and remind the operation and maintenance personnel to check the remote adjustment information address, remote adjustment data type and other technical parameters.

[0031] The technical solutions provided by steps S1 to S3 realize the determination and processing of the active power rejection state of the inverter through the communication interaction between the power control system and the inverter. In the case that the control instruction issued by the power control system cannot be correctly executed when the inverter rejects, the cause of the inverter rejection can be analyzed and the corresponding measures can be taken. Steps S1 to S3 form a closed loop control system. Step S1 ensures the reliability of the communication link, step S2 ensures that the actual output of the inverter is consistent with the target by analyzing the remote adjustment message, and step S3 ensures that the inverter can correctly respond to the control instruction by issuing and confirming the remote adjustment instruction. Through the interaction of remote adjustment selection message, remote adjustment execution message and corresponding confirmation frame, the power control system can timely discover and process the rejection state of the inverter, avoid the global control failure caused by local fault, and assist in understanding the logical factors of the inverter rejection.

[0032] As a preferred, on the basis of steps S1 to S3, step S4 is further included: performing wake-up operation on the inverter marked with rejection state in a regulation period, setting corresponding wake-up logic according to different rejection states of the inverter, feeding back the rejection state of the inverter to corresponding algorithm, and adjusting the regulation logic of the rejection inverter according to the specific state of different inverters. The rejection state set in the wake-up logic in step S4 is specifically: up-regulation rejection, deviation rejection and absolute rejection.

[0033] Step S4, in the adjustment period of the power control system, different wake-up strategies are adopted for inverters in different refusal states (upward refusal, deviation refusal, absolute refusal), the parameter logic is dynamically adjusted, and the state is fed back to the control algorithm to realize accurate processing of inverter refusal state and improve the overall collaborative optimization capability of the power control system. In step S4, the corresponding wake-up logic is matched according to the refusal type (upward refusal, deviation refusal, absolute refusal) to realize fine inverter control management and avoid active efficiency loss or secondary failure caused by rough refusal type identification. In step S4, the refusal state is fed back to the control algorithm to real-time correct the power distribution logic of the inverter (such as amplitude limiting adjustment, priority degradation), improve the ability of the power control system to handle inverter refusal, improve the collaborative capability of the power control system and the inverter, reduce the number of invalid wake-up refusal inverters, shorten the inverter refusal time period, and ensure the stable operation of the power grid.

[0034] As preferred, in step S1, the power control system communicates with the inverter, the power control system detects whether the remote adjustment confirmation frame sent back by the inverter is received, and the remote adjustment state bit and the communication link state register are set according to the detection result of the remote adjustment confirmation frame, further comprising:

[0035] Step S11, the power control system completes the instruction distribution, sends the corresponding first remote adjustment message to the inverter, the inverter acquires the first remote adjustment message and feeds back the corresponding remote adjustment confirmation frame, the power control system acquires the remote adjustment confirmation frame, and sets the remote adjustment state bit to the remote adjustment success state, or:

[0036] Step S12, if the power control system does not receive the remote adjustment confirmation frame corresponding to the first remote adjustment message, the communication link state is detected, if the interaction message is interrupted, the communication link state register is set to the communication interruption state, and the second remote adjustment message is issued.

[0037] Step S13, if the power control system receives the remote adjustment confirmation frame corresponding to the second remote adjustment message, the remote adjustment state bit is set to the remote adjustment success state, or:

[0038] Step S14, if the power control system does not receive the remote adjustment confirmation frame corresponding to the second remote adjustment message, the remote adjustment state bit is set to the remote adjustment refusal state.

[0039] In the optimization technical scheme provided in steps S11 to S14,

[0040] The first remote adjustment message starts the control process of the power control system, ensures correct transmission of the command distribution, and monitors the actual output of the inverter in real time. When the communication link is abnormal, the second remote adjustment message reissues the command distribution, and the second remote adjustment message confirms the actual output of the inverter, ensuring that the command distribution of the power control system is correctly executed. Through the issuance and confirmation of the first and second remote adjustment messages and the feedback of the corresponding remote adjustment confirmation frame, the power control system can timely discover and handle the abnormality of the communication link, monitor the state of the communication link in real time, accurately convey the target power value to the inverter, and monitor the actual output power of the inverter in real time and ensure that it adjusts according to the preset target value.

[0041] As preferred, in step S2, during the process in which the inverter acquires the remote adjustment message and returns the corresponding remote adjustment confirmation frame, the power control system sets the remote adjustment state bit to a remote adjustment success state and detects the command telemetry feedback value in the remote adjustment message. According to the above communication interaction and the setting of the remote adjustment state bit by the power control system, it can be detected whether the actual output power of the inverter really reaches the target value. During the above communication interaction, the inverter generates a remote adjustment confirmation frame by acquiring a remote adjustment message, the power control system sets the corresponding remote adjustment state bit, and detects the command telemetry feedback value. The above technical means cooperate to form a complete closed-loop control process, ensuring the consistency of the actual output power of the inverter and the target value, and improving the overall stability and reliability of the system.

[0042] As preferred, in step S2, the power control system analyzes the remote adjustment message fed back by the inverter during the communication interaction, detects the active power action of the inverter according to the analysis result of the remote adjustment message, and adjusts the remote adjustment state bit (command state register) of the power control system according to the active power action. Further comprising:

[0043] The power control system detects whether the single command telemetry return value in the remote adjustment message fed back by the inverter is correct, determines whether the active power action of the inverter is correct, and if the single command telemetry return value is correct and the active power action is incorrect, determines that the inverter refuses to act, sets the refusal state bit to an execution refusal state, or: the active power action is correct, and the single action of the inverter is completed.

[0044] In this preferred embodiment, the power control system verifies whether the active power execution result of the inverter is consistent with the instruction distribution of the power control system by analyzing the remote adjustment message returned by the inverter, so as to determine whether the inverter is in a refusal state, and accordingly updates the remote adjustment state or marks the action completion. Through comparison between the instruction and the return value, a closed-loop detection mechanism is formed to ensure the accuracy of the inverter action. If the return value is inconsistent with the instruction, it is determined that the inverter is in a refusal state, and the power control system updates the refusal state bit, thereby shortening the fault response time and realizing the collaborative management of the inverter and the power control system, that is, if the inverter action is correct, the single action is marked as completed, and the subsequent instruction distribution is waited for. If the inverter is in a refusal state, the refusal state bit is set to a refusal state, an alarm is triggered or the instruction is re-sent, and through real-time monitoring of the state synchronization of the inverter and the power control system, the error accumulation is avoided, and the stable operation of the power grid is ensured.

[0045] For example, in the process in which the power control system detects whether the single instruction telemetry return value in the remote adjustment message returned by the inverter is correct, if the single instruction telemetry return value is incorrect, the remote adjustment message is sent again to detect whether the active power action is correct. If the single instruction telemetry return value returned again is incorrect, it is determined that the inverter is in a refusal state, and the refusal state bit is set to a refusal state.

[0046] In this specific embodiment, when the power control system detects the active power action of the inverter, if the first single instruction telemetry return value is abnormal, a re-sending mechanism is triggered for secondary verification. If the secondary verification fails again, it is determined that the inverter is in a refusal state, and the refusal state bit is updated, thereby ensuring the accuracy of the inverter fault determination. Through the re-sending mechanism, the instantaneous communication interference or temporary fault is excluded, the misjudgment probability is reduced, through the retry mechanism, the misoperation caused by single communication abnormality is avoided, if the secondary verification fails, it is determined that it is a persistent fault, and the refusal state bit is updated collaboratively to reflect the real state of the inverter in a normal or refusal state. Through the secondary verification mechanism, the detection accuracy and response speed are balanced, and the power control system is prevented from being frequently occupied due to false alarms.

[0047] As preferred, in step S3, for the inverter marked with remote adjustment refusal, the power control system sends a remote adjustment selection message and a remote adjustment execution message to the inverter, and the inverter returns the corresponding confirmation frame to confirm the current state of the inverter, and the remote adjustment refusal state of the inverter is cancelled, or: the inverter does not return the corresponding remote adjustment selection message confirmation frame and remote adjustment execution message confirmation frame, and the alarm information related to the inverter refusal is pushed, further comprising:

[0048] In step S31, the power control system issues a remote adjustment selection message, the inverter returns a remote adjustment selection message confirmation frame to reply success, the power control system issues a remote adjustment execution message, the inverter returns a remote adjustment execution message confirmation frame to reply success, and the remote adjustment refusal state of the inverter is cancelled, or:

[0049] Step S32, the inverter does not send back the remote adjustment selection message confirmation frame and the remote adjustment execution message confirmation frame, and sets the remote adjustment control point state word in the power control system to refuse to act.

[0050] The optimization technical solution provided by steps S31 to S32 performs closed-loop verification through the interaction of the remote adjustment selection message and the remote adjustment execution message, ensures that the actual state of the inverter is consistent with the expectation, discovers the abnormal state of the inverter in time through the sending back of the confirmation frame, avoids the global control failure caused by local faults, ensures that the actual state of the inverter is consistent with the expectation, and discovers and processes the abnormal state of the inverter in time. In the normal response case, the power control system issues the remote adjustment selection message and the remote adjustment execution message, and if the inverter can successfully send back the confirmation frame, the power control system cancels the "remote adjustment refusal to act" state of the inverter; in the abnormal response case, if the inverter fails to send back the confirmation frame, the power control system sets the refusal to act state bit to "refusal to act", and pushes the alarm information, so as to discover and process the problem in time, remind the operation and maintenance personnel to detect parameters and eliminate faults, for example, push the alarm information "inverter refuses to act due to remote adjustment refusal to act".

[0051] For the method steps disclosed in the above embodiments, the method steps are described as a series of action combinations for the purpose of simple description, but those skilled in the art should know that the application embodiments are not limited by the action sequence described, because according to the application embodiments, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification all belong to preferred embodiments, and the actions involved are not necessarily necessary for the application embodiments.

[0052] Any process or method described by a flowchart or otherwise described herein can be understood as a representation of code, such as machine-readable instructions, including one or more steps for performing a specific logical function or procedure, and the scope of preferred embodiments of the application includes additional implementations that can not be in the order shown or discussed, including performing and implementing functions in a substantially simultaneous manner according to the functions involved or in reverse order, or executing computer instructions and implementing corresponding functions according to loop, branch, etc. program structure, which is naturally understood by those skilled in the art when implementing the application embodiments.

[0053] As shown in the inverter refusal to act control system, Figure 2 for implementing the inverter refusal to act control method of any specific embodiment of the application, comprising:

[0054] The remote adjustment confirmation frame confirmation module, the power control system and the inverter communicate and interact, the power control system detects whether the remote adjustment confirmation frame sent back by the inverter is received, and the remote adjustment state bit and the communication link state register are set correspondingly according to the detection result of the remote adjustment confirmation frame;

[0055] The remote adjustment state bit adjustment module, the power control system analyzes the remote adjustment message fed back by the inverter in the communication and interaction process, detects the instruction feedback of the inverter according to the analysis result of the remote adjustment message, and adjusts the remote adjustment state bit of the inverter correspondingly according to the instruction feedback of the inverter.

[0056] The remote adjustment refusal operation and alarm module, for the inverter marked with remote adjustment refusal, the power control system sends a remote adjustment selection message and a remote adjustment execution message to the inverter, the inverter sends back the corresponding confirmation frame, the current state of the inverter is confirmed through communication and interaction, the remote adjustment refusal state operation of the inverter is executed, or: the inverter does not send back the corresponding remote adjustment selection message confirmation frame and remote adjustment execution message confirmation frame, and the alarm information of the inverter refusal is pushed.

[0057] It is worth noting that, although only some basic function modules are disclosed in the embodiments of the present application, it does not mean that the composition of the system is limited to the above-mentioned basic function modules, on the contrary, the meaning expressed by the embodiments is: on the basis of the above-mentioned basic function modules, one or more function modules can be added by those skilled in the art in combination with the prior art to form infinite embodiments or technical solutions, that is, the system is open rather than closed, and the protection scope of the claims of the embodiments of the present application cannot be limited to the disclosed basic function modules. At the same time, in order to describe conveniently, the above device is described as various units and modules. Of course, the functions of the units and modules can be realized in the same software and / or hardware in the implementation of the embodiments of the present application.

[0058] As shown in Figure 3 IEC-104 network protocol and active power control system, the rated capacity of a single inverter is 500kW. There are 10 inverters in the whole station, and the initial state is normal. The global command cycle is 1 minute, the wake-up delay is 1 second after the single inverter refusal is determined, and the control accuracy is set to 0.95. Control operation description: when the inverter is determined to be in the "refusal" state, a certain delay is entered into the wake-up operation, and the delay can be manually set. Each time the single inverter command is issued, the refusal logic judgment is triggered. The active power action accuracy criterion is the ratio of the executed power to the target power, which can be manually set and defaults to 0.95.

[0059] First round of global active power adjustment (1# inverter):

[0060] 1# inverter instruction allocation is 200kW, remote message issued; 1# inverter reply remote confirmation message; 1# inverter on the command 200kW telemetry feedback message; 1# inverter active power adjustment to 199kW control accuracy 99 / 200 = 0.995, meet the value requirements, adjustment end.

[0061] Second round of global active power adjustment (2# inverter):

[0062] 2# inverter instruction allocation 220kW, remote message issued; 2# inverter reply remote confirmation message; 2# inverter did not send instruction 220kW telemetry feedback message; 2# inverter active power did not act, continue to run at 199kW power; 2# inverter 220kW instruction, issued again; 2# inverter active power did not act, continue to run at 199kW power; determine 2# inverter for "refuse to move" state; after 1 second delay, start "wake up" process; check 2# inverter SOE information, whether there is a body lock, over-temperature operation, insulation impedance reduction, module fault alarm information; detect SOE information without fault signal, check inverter telemetry information, body temperature, impedance, current, voltage, power and other important parameters, whether close to the critical value of alarm or fault value; SOE and telemetry information are normal, determine 2# inverter for "absolute refusal to move" state; feedback core algorithm, cancel all 2# inverter power control permissions.

[0063] Third round of global active power adjustment (3# inverter): 3# inverter instruction allocation 330kW, remote message issued; 3# inverter reply remote confirmation message; 3# inverter on the command 330kW telemetry feedback message; 3# inverter active power action, the final to 290kW power; control accuracy 290 / 330 = 0.87, not meet the value requirements; 3# inverter 330kW instruction, issued again; 3# inverter active power did not act, continue to run at 290kW power; determine 3# inverter for "refuse to move" state; after 1 second delay, start 3# inverter "wake up" process; check 3# inverter SOE information, whether there is a body lock, over-temperature operation, insulation impedance reduction, module fault alarm information; check SOE information without fault signal, check inverter telemetry information, body temperature, impedance, current, voltage, power and other important parameters, whether close to the critical value of alarm or fault value; SOE and telemetry information are normal, determine 3# inverter for "deviation refusal to move" state; feedback core algorithm, 3# inverter for "deviation refusal to move" state, according to the actual deviation power 40kW compensation adjustment; when detecting 3# inverter execution power / (target power-deviation)>0.95, remove 3# inverter "refuse to move" state.

[0064] The fourth round of global active power adjustment (4# inverter):

[0065] 4# inverter instruction allocation 380kW, remote message issued; 4# inverter reply remote confirmation message; 4# inverter sends instruction 330kW telemetry feedback message; 4# inverter active power does not act, continue to run with 330kW power; 4# inverter 330kW instruction, issued again; 4# inverter active power does not act, continue to run with 330kW power; determine 4# inverter for "refuse to move" state; after 1 second delay, start 4# inverter "wake up" process; check 4# inverter SOE information, whether there is a body lock, over-temperature operation, insulation impedance reduction, module failure and other alarm information, found to exist "over-temperature operation" alarm; check 4# inverter telemetry information, body temperature, impedance, current, voltage, power and other important parameters, found that the 4# inverter body temperature exceeds the over-temperature operation alarm set value; determine 4# inverter for "up-regulation refuse to move" state; feedback core algorithm, 4# inverter for "up-regulation refuse to move", when the global adjustment is up-regulation action, cancel the 4# inverter participation adjustment permission. When the global adjustment is down-regulation action, 4# inverter participates in mediation; when the 4# inverter "over-temperature operation" fault is eliminated, the 4# inverter "refuse to move" state is removed.

[0066] In the above four rounds of global active power adjustment control process, the power control system accurately controls the active power of the inverter, and through real-time monitoring and dynamic adjustment of the state of the inverter, it ensures that the inverter can correctly respond to the control instruction. The power control system implements instruction issuance, telemetry feedback, refusal state determination, wake-up process and fault diagnosis through the coordinated cooperation of multiple steps, realizes the comprehensive monitoring and dynamic adjustment of the state of the inverter, and the above content can be summarized as:

[0067] 1. The power control system issues a remote control message, the inverter feedbacks a remote control message, and the power control system judges whether the control is successful by comparing the actual output with the target value.

[0068] 2. If the inverter does not correctly respond to the instruction, the power control system will mark it as "refuse to move" state and start the wake-up process.

[0069] 3. The power control system checks the SOE information and telemetry information to determine whether the inverter refuses to move due to failure, and dynamically adjusts the current state of the inverter according to the response of the inverter.

[0070] The embodiments provided by the specific embodiments accurately control the active power of the inverter, dynamically distribute instructions to the inverter, monitor and determine the inverter in real time, and determine the inverter in a state of refusal. For the inverter marked as "refusal", the power control system starts the "wake-up" process after a delay, checks the SOE information and remote adjustment information of the inverter, determines whether the inverter is in a state of refusal due to failure, can discover and handle the abnormal state of the inverter in time, and realizes the overall monitoring and dynamic control of the state of the inverter through the cooperation of the steps of instruction distribution, remote feedback, refusal state determination, wake-up process and fault diagnosis, so as to ensure that the inverter can correctly respond to the control instruction, thereby improving the overall stability and reliability of the power control system and the inverter.

[0071] The technical features of the above embodiments can be combined in any way. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the description of the embodiments of the present application.

[0072] In the description of the specification of the present application, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0073] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the present application.

[0074] All features disclosed by the present application, or steps in all methods or processes disclosed by the present application, can be combined in any way, except that mutually exclusive features and / or steps are combined. Any feature disclosed in the specification of the present application can be replaced by other equivalent or similar purpose of the alternative features, unless otherwise specified. That is, each feature is only an example of a series of equivalent or similar features, unless otherwise specified. Throughout the specification, the same reference signs indicate the same elements.

[0075] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them. Although the embodiments of the present application have been described in detail with reference to the foregoing specific embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part or all of the technical features, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the embodiments of the present application.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them. Although the embodiments of the present application have been described in detail with reference to the foregoing specific embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part or all of the technical features, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the embodiments of the present application.

Claims

1. An inverter refusal control method characterized by comprising: The power control system communicates with the inverter, detects whether the remote control confirmation frame sent back by the inverter is received, and sets the remote control state bit and the communication link state register according to the detection result of the remote control confirmation frame. The power control system analyzes the remote control message fed back by the inverter in the communication interaction process, detects the instruction feedback of the inverter according to the analysis result of the remote control message, and adjusts the remote control state bit of the inverter according to the instruction feedback of the inverter. For the inverter marked as remote control rejection, the power control system sends a remote control selection message and a remote control execution message to the inverter, the inverter sends back the corresponding confirmation frame, the current state of the inverter is confirmed through communication interaction, and the operation of canceling the remote control rejection state of the inverter is performed, or: the inverter does not send back the corresponding remote control selection message confirmation frame and remote control execution message confirmation frame, and then the alarm information related to the inverter rejection is pushed. The power control system communicates with the inverter, detects whether the remote control confirmation frame sent back by the inverter is received, and sets the remote control state bit and the communication link state register according to the detection result of the remote control confirmation frame.

2. The inverter refusal control method according to claim 1, characterized by, The power control system completes the instruction distribution, sends the corresponding first remote control message to the inverter, the inverter acquires the first remote control message and feeds back the corresponding remote control confirmation frame, the power control system acquires the remote control confirmation frame, and sets the remote control state bit to the remote control success state, or: If the power control system does not receive the remote control confirmation frame corresponding to the first remote control message, the communication link state is detected, if the interaction message is interrupted, the communication link state register is set to the communication interruption state, and if the interaction message is normal, the second remote control message is sent; If the power control system receives the remote control confirmation frame corresponding to the second remote control message, the remote control state bit is set to the remote control success state, or: If the power control system does not receive the remote control confirmation frame corresponding to the second remote control message, the remote control state bit is set to the remote control rejection state. In the process of detecting whether the remote control confirmation frame sent back by the inverter is received, the power control system sets the remote control state bit to the remote control success state, and detects the instruction telemetry feedback value in the remote control message.

3. The inverter refusal control method according to claim 2, characterized by, The power control system analyzes the remote control message fed back by the inverter in the communication interaction process, detects the instruction feedback of the inverter according to the analysis result of the remote control message, and adjusts the remote control state bit of the inverter according to the instruction feedback of the inverter.

4. The inverter refusal control method of claim 1, wherein The power control system detects whether the single instruction telemetry return value in the remote control message sent back by the inverter is correct, determines whether the active power action of the inverter is correct, if the single instruction telemetry return value is correct and the active power action is incorrect, it is determined that the inverter rejects, and the rejection state bit is set to the execution rejection state, or: The active power action is correct, and the single action of the inverter is ended. ​ 5. The inverter refusal control method according to claim 4, characterized by, In the process of detecting whether the single instruction telemetry return value in the inverter echo remote control message is correct in the power control system, if the single instruction telemetry return value is incorrect, the remote control message is sent again to detect whether the active power action is correct, if the single instruction telemetry return value returned again is incorrect, it is judged that the inverter is in a refusal state, and a refusal state bit is set to a remote control refusal state.

6. The inverter refusal control method of claim 1, wherein For the inverter marked with remote control refusal, the power control system sends a remote control selection message and a remote control execution message to the inverter, the inverter echoes corresponding confirmation frames, the current state of the inverter is confirmed through communication interaction, and the remote control refusal state of the inverter is cancelled, or: the inverter does not echo the corresponding remote control selection message confirmation frame and remote control execution message confirmation frame, and alarm information related to inverter refusal is pushed, further comprising: The power control system issues a remote control selection message, the inverter echoes a remote control selection message confirmation frame to reply successfully, the power control system issues a remote control execution message, the inverter echoes a remote control execution message confirmation frame to reply successfully, and the remote control refusal state of the inverter is cancelled, or: The inverter does not echo the remote control selection message confirmation frame and the remote control execution message confirmation frame, and the remote control control point state word in the power control system is set to a refusal.

7. The inverter refusal control method according to claim 6, characterized by, The alarm information related to inverter refusal is pushed, specifically: the alarm information of "inverter refusal due to remote control refusal" is pushed.

8. The inverter refusal control method of claim 1, wherein Further comprising: In a single adjustment cycle, the inverter marked as a refusal state is woken up, corresponding wake-up logic is set according to different refusal states of the inverter, the refusal state of the inverter is fed back to the corresponding algorithm, and the parameter adjustment logic of the inverter in the refusal state is adjusted according to the specific state of the different inverters.

9. The inverter refusal control method according to claim 8, characterized by, The refusal state set in the wake-up logic is specifically: up-regulation refusal, deviation refusal and absolute refusal.

10. An inverter denial control system, characterized by comprising: The inverter refusal control method according to any one of claims 1 to 9, comprising: A remote control confirmation frame confirmation module, the power control system and the inverter communicate and interact, the power control system detects whether the remote control confirmation frame echoed by the inverter is received, and the remote control state bit and the communication link state register are set correspondingly according to the detection result of the remote control confirmation frame; A remote control state bit adjustment module, the power control system analyzes the remote control message fed back by the inverter in the communication interaction process, detects the instruction feedback of the inverter according to the analysis result of the remote control message, and adjusts the remote control state bit of the inverter correspondingly according to the instruction feedback of the inverter; A remote control refusal operation and alarm module, for the inverter marked with remote control refusal, the power control system sends a remote control selection message and a remote control execution message to the inverter, the inverter echoes corresponding confirmation frames, the current state of the inverter is confirmed through communication interaction, and the remote control refusal state of the inverter is cancelled, or: the inverter does not echo the corresponding remote control selection message confirmation frame and remote control execution message confirmation frame, and alarm information related to inverter refusal is pushed.

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