A control system for a flexible direct current transmission converter valve

Abstract

The application provides a control system of a flexible direct current transmission converter valve, comprising: a control signal receiving module, which is used for converting a trigger angle control signal of the converter valve into a trigger angle pulse signal and delivering the trigger angle pulse signal to a valve piece in the converter valve; a control module, which is used for monitoring a highest alternating current voltage on one side of the converter valve and controlling a conduction state of the valve piece in the converter valve based on the trigger angle pulse signal when the highest alternating current voltage meets a flexible direct current transmission requirement; and a safety protection module, which is used for acquiring a back-check signal of the valve piece of the converter valve based on a control result in real time and determining a working state of the valve piece based on the back-check signal and performing trip control when a fault exists. The control accuracy of the flexible direct current transmission converter valve is ensured, the working state of the valve piece in the converter valve is analyzed in real time, and the trip control is performed in time when a fault exists, so that the safety and reliability of the flexible direct current transmission are ensured, and the effect of the flexible direct current transmission is improved.

Description

Technical Field

[0001] This invention relates to the field of equipment control technology, and in particular to a control system for a flexible DC power transmission converter valve. Background Technology

[0002] Currently, flexible DC transmission converts alternating current into flexible direct current to provide stable and reliable power to other equipment. Compared with ordinary DC transmission, the magnitude and direction of the current in flexible DC transmission can be controlled, which provides convenience for powering devices.

[0003] In flexible DC transmission, the timing and voltage of the transmission need to be switched by converter valves. Precise control of the converter valves is beneficial to improving the safety and efficiency of flexible DC transmission.

[0004] However, the current control of converter valves is all semi-intelligent, requiring manual and equipment collaboration to achieve the conversion of AC power. This greatly reduces the control effect of the converter valves. At the same time, due to human intervention, abnormalities in the converter valves during operation cannot be detected in time, which has a serious impact on flexible DC transmission and reduces the safety of flexible DC transmission.

[0005] Therefore, the present invention provides a control system for a flexible DC transmission converter valve. Summary of the Invention

[0006] This invention provides a control system for a flexible DC transmission converter valve. It converts a trigger angle control signal into a trigger angle pulse signal, and controls the conduction state of the valve plate based on the value of the highest AC voltage using the trigger angle pulse signal. This ensures the accuracy of the control of the flexible DC transmission converter valve. Simultaneously, it performs real-time analysis of the valve plate's operating state and promptly trips the valve in case of a fault, ensuring the safety and reliability of flexible DC transmission and improving its efficiency.

[0007] This invention provides a control system for a flexible DC transmission converter valve, comprising:

[0008] The control signal receiving module is used to convert the firing angle control signal of the converter valve into a firing angle pulse signal, and send the firing angle pulse signal to the valve plate in the converter valve.

[0009] The control module is used to monitor the highest AC voltage on one side of the converter valve, and when the highest AC voltage meets the requirements of flexible DC transmission, it controls the conduction state of the valve plate in the converter valve based on the trigger angle pulse signal.

[0010] The safety protection module is used to acquire the return inspection signal of the valve plate of the converter valve in real time based on the control results, determine the working status of the valve plate based on the return inspection signal, and perform trip control when a fault exists.

[0011] Preferably, a control system for a flexible DC transmission converter valve includes a control signal receiving module, comprising:

[0012] The signal receiving unit is used to obtain the target number of valve plates in the converter valve, and generate a firing angle control signal for each valve plate through the control terminal based on the target number.

[0013] The signal processing unit is used to determine the processing clock parameters of the trigger angle control signal based on the preset conversion frequency, and to process the trigger angle control signal based on the processing clock parameters to obtain the initial trigger angle pulse signal. At the same time, it extracts the fluctuation amplitude and conversion period of the initial trigger angle pulse signal.

[0014] The signal conversion unit is used to determine the zero-crossing point of the initial trigger angle pulse signal based on the fluctuation amplitude and the conversion period, and to adapt the signal waveform corresponding to the initial trigger angle pulse signal based on the zero-crossing point, and to obtain the final trigger angle pulse signal based on the adaptation result.

[0015] Preferably, a control system for a flexible DC transmission converter valve includes a control signal receiving module, comprising:

[0016] The signal acquisition unit is used to acquire the obtained trigger angle pulse signal, extract the terminal identifier of the trigger angle pulse signal, and divide the trigger angle pulse signal based on the terminal identifier to obtain sub-trigger angle pulse signals;

[0017] The link building unit is used to build fiber optic transmission links between the control terminal and each valve plate in the converter valve. At the same time, it converts the sub-triggered angle pulse signal into an optical signal based on a preset signal conversion device and buffers the optical signal in the queue to be transmitted.

[0018] The signal transmission unit is used to transmit the optical signal buffered in the transmission queue to the corresponding valve plate in the corresponding converter valve through the optical fiber transmission link based on the terminal identifier, thereby completing the transmission of the trigger angle pulse signal.

[0019] Preferably, a control system for a flexible DC transmission converter valve includes a link construction unit comprising:

[0020] The link monitoring subunit is used to acquire optical transmission link construction data in real time, determine the construction progress of optical transmission link in real time based on the construction data, and retrieve target test data from the preset test database when the optical transmission link is completed.

[0021] The link testing subunit is used to determine the testing order of the optical transmission link, mark the optical transmission link based on the testing order, and transmit the target test data to the valve plate sequentially through the optical transmission link based on the marking results.

[0022] The optimization subunit is used to monitor the feedback response of each valve based on the transmission results, and to complete the conduction verification of the optical transmission link when the feedback response meets the test requirements of the target test data.

[0023] Preferably, a control system for a flexible DC transmission converter valve includes a control module comprising:

[0024] The voltage parameter setting unit is used to obtain the flexible DC transmission requirements, analyze the flexible DC transmission requirements, determine the DC reference voltage of each valve plate in the converter valve, and determine the reference reference voltage of each valve plate in the converter valve based on the working attributes of the converter valve.

[0025] The voltage monitoring unit is used to acquire a set of real-time voltage values ​​of the AC power on one side of the converter valve based on a preset time interval, and to determine the target value point in a preset rectangular coordinate system based on the order of acquisition time of the acquired real-time voltage value set, and to determine the real-time voltage value change curve of the AC power based on the target value point.

[0026] The judgment unit is used to extract the stable curve segment in the real-time voltage value change curve, determine the target voltage value of the stable curve segment, and determine that the flexible DC transmission requirements are met when the target voltage value is greater than both the DC reference voltage and the reference voltage. Based on the trigger angle pulse signal, the working state of the valve plate in the converter valve is switched to the conducting state.

[0027] Preferably, a control system for a flexible DC transmission converter valve includes a judgment unit comprising:

[0028] The result acquisition subunit is used to determine the conduction sequence of different valve plates in the converter valve when the requirements of flexible DC transmission are met. At the same time, it feeds back control requests to the control terminal, and the control terminal sends trigger angle pulse signals carrying control commands to the valve plates in the converter valve through a preset number of optical signal transmitters based on the control requests.

[0029] The analysis subunit is used to extract key signal segments of trigger angle pulse signals carrying control commands sent by different preset optical signal transmitters received by the valve plate in the converter valve, and to determine the similarity of the key signal segments.

[0030] The execution subunit is used to switch the working state of the valve plate in the converter valve to the conducting state according to the conduction sequence based on the received trigger angle pulse signal carrying the control command when the number of similar key signal segments exceeds half of the total.

[0031] Preferably, a control system for a flexible DC transmission converter valve includes an execution subunit comprising:

[0032] The switching monitoring subunit is used to monitor the current value of the valve plate flowing through the switching valve at various times in real time after the working state of the valve plate in the switching valve is switched to the conducting state, and to record the current value at each time.

[0033] The state switching subunit is used to determine the target time when the current value is 0 based on the recorded results, and to switch the valve plate that is currently in the conducting state to the off state based on the target time.

[0034] Preferably, a control system for a flexible DC transmission converter valve includes a safety protection module, comprising:

[0035] The back-check signal acquisition unit is used to acquire the internal voltage and internal current values ​​of the valve plate in the converter valve in real time based on the control results, convert the internal voltage and internal current values ​​into back-check optical signals, and feed back the back-check optical signals to the control terminal based on the optical fiber transmission link.

[0036] The model building unit is used to extract the target operating feature parameters of the valve plate in the converter valve, and use the target operating feature parameters as training samples to build a state evaluation model. At the same time, the acquisition time of the obtained return optical signal is segmented based on the preset time segmentation step size, and the sub-return optical signal corresponding to each time segment is determined based on the segmentation result.

[0037] The state analysis unit is used to determine the weighting coefficients of the internal voltage and internal current values ​​contained in the sub-return optical signal of each time period, and to determine the correspondence between the internal voltage and internal current values ​​contained in the sub-return optical signal of each time period based on the weighting coefficients. The correspondence and the sub-return optical signal corresponding to each time period are input into the state evaluation model for analysis to obtain the working state of the valve plate in each time period.

[0038] Preferably, a control system for a flexible DC transmission converter valve includes a state analysis unit, comprising:

[0039] The status acquisition subunit is used to acquire the working status of the valve plate in each time period and obtain the performance value of the valve plate in each time period based on the working status.

[0040] The comparison subunit is used to compare the performance value with the preset performance threshold, and when the performance value of the valve plate in the converter valve is lower than the preset performance threshold, it is determined that there is an abnormality in the converter valve, and the target abnormal valve plate is determined based on the determination result.

[0041] The safety protection subunit is used to generate trip control commands based on the target abnormal valve plate, and to perform trip operations on the target abnormal valve plate based on the trip control commands. At the same time, it determines the docking interface configuration parameters of the preset backup device, and switches the working process of the target abnormal valve plate based on the docking interface configuration parameters.

[0042] Preferably, a control system for a flexible DC transmission converter valve includes a state analysis unit, comprising:

[0043] The status monitoring subunit is used to acquire the working status of the valve plate in real time for each time period after it is in the off state, and to determine the real-time voltage value of the AC power on one side of the valve plate based on the working status.

[0044] The emergency analysis subunit is used to compare the real-time voltage value with the preset protection threshold of the valve plate, and send an emergency control command to the control terminal when the real-time voltage value is greater than or equal to the preset protection threshold.

[0045] The emergency subunit is used to temporarily open the valve plate in the converter valve based on emergency control commands, and restore the valve plate to the closed state when the current value becomes 0.

[0046] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0047] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0048] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0049] Figure 1 This is a structural diagram of a control system for a flexible DC power transmission converter valve according to an embodiment of the present invention;

[0050] Figure 2 This is a structural diagram of the control signal receiving module in the control system of a flexible DC power transmission converter valve according to an embodiment of the present invention;

[0051] Figure 3 This is a structural diagram of the control module in the control system of a flexible DC power transmission converter valve according to an embodiment of the present invention. Detailed Implementation

[0052] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0053] Example 1:

[0054] This embodiment provides a control system for a flexible DC transmission converter valve, such as... Figure 1 As shown, it includes:

[0055] The control signal receiving module is used to convert the firing angle control signal of the converter valve into a firing angle pulse signal, and send the firing angle pulse signal to the valve plate in the converter valve.

[0056] The control module is used to monitor the highest AC voltage on one side of the converter valve, and when the highest AC voltage meets the requirements of flexible DC transmission, it controls the conduction state of the valve plate in the converter valve based on the trigger angle pulse signal.

[0057] The safety protection module is used to acquire the return inspection signal of the valve plate of the converter valve in real time based on the control results, determine the working status of the valve plate based on the return inspection signal, and perform trip control when a fault exists.

[0058] In this embodiment, the converter valve is an essential core device for flexible DC transmission, which aims to convert AC power into DC power with the desired DC voltage, thereby enabling power supply to the equipment.

[0059] In this embodiment, flexible DC transmission refers to powering the equipment by means of DC power, and by controlling the voltage and other parameters of the DC power.

[0060] In this embodiment, the trigger angle control signal is issued by the control terminal and is used to change the conduction state of the valve plate in the converter valve, that is, to control the opening and closing of the valve plate in the converter valve.

[0061] In this embodiment, the trigger angle pulse signal refers to the conversion of the trigger angle control signal into a pulse signal, which facilitates the control of the conduction time of the valve plate in the converter valve.

[0062] In this embodiment, sending the trigger angle pulse signal to the valve plate in the converter valve means sending the trigger angle pulse signal to the corresponding valve plate, and the valve plate in the converter valve is not unique.

[0063] In this embodiment, the highest AC voltage refers to the voltage value of the AC power connected to the converter valve. Only when the AC voltage value meets the conversion requirements can the AC power be converted into flexible DC power through the converter valve.

[0064] In this embodiment, the requirements for flexible DC transmission are set in advance, which may be the required voltage value of the flexible DC. Current conversion can only be performed when the AC power on the converter valve side meets the requirements.

[0065] In this embodiment, controlling the conduction state of the valve plate in the converter valve by the trigger angle pulse signal means that when the highest AC voltage meets the requirements of flexible DC transmission, the valve plate is changed from the off state to the on state, and vice versa.

[0066] In this embodiment, the back-check signal refers to the working data of different valve plates in the converter valve when they are turned on or off.

[0067] In this embodiment, determining the working status of the valve plate based on the feedback signal means analyzing the feedback signal to determine whether the working status of the valve plate in the converter valve is normal, so as to facilitate timely adjustment when the valve plate malfunctions.

[0068] The beneficial effects of the above technical solution are as follows: by converting the trigger angle control signal into a trigger angle pulse signal, and controlling the conduction state of the valve plate according to the value of the highest AC voltage, the control accuracy of the flexible DC transmission converter valve is guaranteed. At the same time, the working state of the valve plate in the converter valve is analyzed in real time, and tripping control is performed in time when a fault occurs, ensuring the safety and reliability of flexible DC transmission and improving the effect of flexible DC transmission.

[0069] Example 2:

[0070] Based on Embodiment 1, this embodiment provides a control system for a flexible DC transmission converter valve, including a control signal receiving module:

[0071] The signal receiving unit is used to obtain the target number of valve plates in the converter valve, and generate a firing angle control signal for each valve plate through the control terminal based on the target number.

[0072] The signal processing unit is used to determine the processing clock parameters of the trigger angle control signal based on the preset conversion frequency, and to process the trigger angle control signal based on the processing clock parameters to obtain the initial trigger angle pulse signal. At the same time, it extracts the fluctuation amplitude and conversion period of the initial trigger angle pulse signal.

[0073] The signal conversion unit is used to determine the zero-crossing point of the initial trigger angle pulse signal based on the fluctuation amplitude and the conversion period, and to adapt the signal waveform corresponding to the initial trigger angle pulse signal based on the zero-crossing point, and to obtain the final trigger angle pulse signal based on the adaptation result.

[0074] In this embodiment, the target quantity refers to the number of valve plates in the converter valve, and the number of valve plates in the converter valve is not unique.

[0075] In this embodiment, the preset conversion frequency is set in advance to limit the number of times the valve plate in the converter valve switches its working state per unit time, thereby realizing the determination based on the clock information when the trigger angle control signal is converted into a trigger angle pulse signal.

[0076] In this embodiment, the clock parameter is used to characterize the specific value of the constant modulation of the trigger angle control signal.

[0077] In this embodiment, processing the trigger angle control signal based on the processing clock parameter refers to integrating the processing clock parameter with the trigger angle control signal to convert the trigger angle control signal into a trigger angle pulse signal. The purpose is to change the period of the trigger angle control signal, thereby achieving timing control of different valve plates in the converter valve.

[0078] In this embodiment, the initial trigger angle pulse signal refers to the trigger angle pulse control signal obtained after configuring the clock information of the trigger angle control signal.

[0079] In this embodiment, the zero-crossing point refers to determining the commutation time of the trigger angle pulse signal, thereby facilitating the timing control of the valve plate in the converter valve.

[0080] In this embodiment, adapting the signal waveform corresponding to the initial firing angle pulse signal based on the zero crossing point refers to determining the signal waveform of the initial firing angle pulse signal, thereby achieving accurate and effective determination of the zero crossing point based on the waveform.

[0081] The beneficial effects of the above technical solution are: by accurately and effectively generating the firing angle control signal according to the target number of valve plates in the converter valve, and by accurately determining the clock parameters and zero-crossing point of the firing angle control signal, the firing angle control signal can be accurately and effectively converted into a firing angle pulse signal, which provides convenience and guarantee for accurate control of the converter valve.

[0082] Example 3:

[0083] Based on Example 1, this example provides a control system for a flexible DC transmission converter valve, such as... Figure 2 As shown, the control signal receiving module includes:

[0084] The signal acquisition unit is used to acquire the obtained trigger angle pulse signal, extract the terminal identifier of the trigger angle pulse signal, and divide the trigger angle pulse signal based on the terminal identifier to obtain sub-trigger angle pulse signals;

[0085] The link building unit is used to build fiber optic transmission links between the control terminal and each valve plate in the converter valve. At the same time, it converts the sub-triggered angle pulse signal into an optical signal based on a preset signal conversion device and buffers the optical signal in the queue to be transmitted.

[0086] The signal transmission unit is used to transmit the optical signal buffered in the transmission queue to the corresponding valve plate in the corresponding converter valve through the optical fiber transmission link based on the terminal identifier, thereby completing the transmission of the trigger angle pulse signal.

[0087] In this embodiment, the terminal identifier can be a tag used to characterize the terminal device corresponding to different trigger angle pulse signals. The valve plate corresponding to the trigger angle pulse signal can be quickly and accurately identified through this tag.

[0088] In this embodiment, the sub-trigger angle pulse signal refers to multiple trigger angle pulse signals obtained by dividing the trigger angle pulse signal according to the terminal identifier, with the purpose of controlling each valve plate in the converter valve.

[0089] In this embodiment, the fiber optic transmission link refers to the signal transmission link that transmits the obtained sub-firing angle pulse signal to the corresponding valve plate. The purpose of using the fiber optic transmission link is to ensure the stability and efficiency of signal transmission.

[0090] In this embodiment, the preset signal conversion device is pre-set to convert the sub-triggered angle pulse signal into an optical signal that can be transmitted in the optical fiber transmission link. The optical signal and the sub-triggered angle pulse signal have the same content, but the format is different. The purpose is to transmit them in the optical fiber transmission link.

[0091] In this embodiment, the transmission queue is a carrier in the optical fiber transmission link that buffers the signal to be transmitted. The purpose of buffering the optical signal in the transmission queue is to arrange the optical signal so that it can be sent to the corresponding valve.

[0092] The beneficial effects of the above technical solution are as follows: by determining the terminal identifier of the trigger angle pulse signal, the trigger angle pulse signal can be divided according to the terminal identifier. Secondly, by constructing an optical fiber transmission link, the sub-trigger angle pulse signals obtained after division are converted into optical signals and transmitted to the corresponding valve plates through the optical fiber transmission link, thereby facilitating the control accuracy of the valve plates in the converter valve and improving the effect of flexible DC power transmission.

[0093] Example 4:

[0094] Based on Example 3, this example provides a control system for a flexible DC transmission converter valve, including a link construction unit:

[0095] The link monitoring subunit is used to acquire optical transmission link construction data in real time, determine the construction progress of optical transmission link in real time based on the construction data, and retrieve target test data from the preset test database when the optical transmission link is completed.

[0096] The link testing subunit is used to determine the testing order of the optical transmission link, mark the optical transmission link based on the testing order, and transmit the target test data to the valve plate sequentially through the optical transmission link based on the marking results.

[0097] The optimization subunit is used to monitor the feedback response of each valve based on the transmission results, and to complete the continuity verification of the optical transmission link when the feedback response meets the test requirements of the target test data.

[0098] In this embodiment, the construction data refers to parameters such as the construction speed and construction length of the optical fiber transmission link during construction.

[0099] In this embodiment, the construction progress is used to characterize the current construction status of the optical fiber transmission link, and can specifically be a parameter such as the construction progress being half of the total length.

[0100] In this embodiment, the preset test database is pre-set and used to store different types of test data.

[0101] In this embodiment, the target test data refers to test data suitable for testing the continuity of the current optical fiber transmission link, which is one of the preset test databases.

[0102] In this embodiment, marking the optical transmission link based on the test order is intended to ensure the orderly conduct of the tests.

[0103] In this implementation, the feedback response is used to characterize the operational behavior of different valve plates after receiving the target test data.

[0104] In this embodiment, the test requirements correspond to the target test data and are known in advance.

[0105] The beneficial effects of the above technical solution are: by monitoring the construction progress of the optical fiber transmission link, the conductivity of the constructed optical fiber transmission link can be tested through target test data after the construction of the optical fiber transmission link is completed, thereby facilitating the assurance of the conductivity of each optical fiber transmission link, improving the control efficiency and accuracy of each valve in the converter valve, and thus ensuring the control effect of flexible DC transmission and the effective operation of flexible DC transmission.

[0106] Example 5:

[0107] Based on Example 1, this example provides a control system for a flexible DC transmission converter valve, such as... Figure 3 As shown, the control module includes:

[0108] The voltage parameter setting unit is used to obtain the flexible DC transmission requirements, analyze the flexible DC transmission requirements, determine the DC reference voltage of each valve plate in the converter valve, and determine the reference reference voltage of each valve plate in the converter valve based on the working attributes of the converter valve.

[0109] The voltage monitoring unit is used to acquire a set of real-time voltage values ​​of the AC power on one side of the converter valve based on a preset time interval, and to determine the target value point in a preset rectangular coordinate system based on the order of acquisition time of the acquired real-time voltage value set, and to determine the real-time voltage value change curve of the AC power based on the target value point.

[0110] The judgment unit is used to extract the stable curve segment in the real-time voltage value change curve, determine the target voltage value of the stable curve segment, and determine that the flexible DC transmission requirements are met when the target voltage value is greater than both the DC reference voltage and the reference voltage. Based on the trigger angle pulse signal, the working state of the valve plate in the converter valve is switched to the conducting state.

[0111] In this embodiment, the requirements for flexible DC transmission are known in advance, and parameters such as voltage and current requirements are used to characterize the flexible DC transmission.

[0112] In this embodiment, the DC reference voltage is used to characterize the voltage value that the AC power needs to reach when converting AC power to DC power.

[0113] In this embodiment, the operating attributes refer to the necessary operating conditions for the converter valve to convert AC power to DC power, specifically the minimum conversion voltage of the AC power.

[0114] In this embodiment, the reference voltage refers to the voltage value at which each valve plate in the converter valve operates.

[0115] In this embodiment, the preset time interval is pre-set and used to monitor the voltage value of the AC power on one side of the converter valve, and it can be adjusted.

[0116] In this embodiment, the real-time voltage value set refers to the voltage values ​​of the AC current on one side of the converter valve at different times, collected at preset time intervals.

[0117] In this embodiment, the preset rectangular coordinate system is pre-set and used to determine the curve of the change in the AC voltage value on one side of the converter valve.

[0118] In this embodiment, the target value point refers to the representation point of the voltage value of the alternating current at different time points in a preset rectangular coordinate system, that is, the specific voltage value of the alternating current at a certain moment is represented by a point.

[0119] In this embodiment, the real-time voltage value change curve refers to the curve obtained by connecting the target value points at different time points.

[0120] In this embodiment, the stable curve segment refers to the line segment in the real-time voltage value change curve where the value does not change.

[0121] In this embodiment, the target voltage value refers to the voltage value of the alternating current corresponding to the steady curve segment.

[0122] The beneficial effects of the above technical solution are as follows: By acquiring and analyzing the requirements for flexible DC transmission, the DC reference voltage and the reference voltage that need to be achieved during the flexible DC transmission process can be accurately and effectively analyzed. Secondly, by monitoring the AC voltage value on one side of the converter valve in real time, and when the voltage value is greater than both the DC reference voltage and the reference voltage, the working state of each valve plate in the converter valve can be adjusted, thereby ensuring the timeliness and accuracy of the converter valve control, improving the accuracy of flexible DC transmission, and ensuring the stable operation of flexible DC transmission.

[0123] Example 6:

[0124] Based on Embodiment 5, this embodiment provides a control system for a flexible DC transmission converter valve, including a judgment unit comprising:

[0125] The result acquisition subunit is used to determine the conduction sequence of different valve plates in the converter valve when the requirements of flexible DC transmission are met. At the same time, it feeds back control requests to the control terminal, and the control terminal sends trigger angle pulse signals carrying control commands to the valve plates in the converter valve through a preset number of optical signal transmitters based on the control requests.

[0126] The analysis subunit is used to extract key signal segments of trigger angle pulse signals carrying control commands sent by different preset optical signal transmitters received by the valve plate in the converter valve, and to determine the similarity of the key signal segments.

[0127] The execution subunit is used to switch the working state of the valve plate in the converter valve to the conducting state according to the conduction sequence based on the received trigger angle pulse signal carrying the control command when the number of similar key signal segments exceeds half of the total.

[0128] In this embodiment, the conduction sequence is used to characterize and limit the order in which each valve plate is turned on. Only two valve plates can be turned on at the same time, and the two valve plates are connected in series.

[0129] In this embodiment, the purpose of sending a control request to the control terminal is to request the control terminal to adjust the conduction state of the valve plate in the converter valve.

[0130] In this embodiment, the number of targets is preset, specifically three preset optical signal transmitters, in order to ensure the accuracy of control over each valve plate in the converter valve.

[0131] In this embodiment, the preset optical signal transmitter is pre-set and is used to transmit the trigger angle pulse signal carrying the control command. The signal is transmitted to the corresponding valve plate through the optical fiber transmission link.

[0132] In this embodiment, the key signal segment refers to the signal segment extracted from the trigger angle pulse signal carrying the control command that can characterize the purpose of the control command.

[0133] In this embodiment, determining the similarity of key signal segments is to determine whether the control objectives to be performed by the trigger angle pulse signals carrying control instructions sent by different preset optical signal transmitters are consistent. Only when the key signal segments with the same control objectives account for more than half of the total number of preset optical signal transmitters will the working state of the valve plate in the converter valve be switched, thus ensuring the accuracy of the valve plate working state switching.

[0134] The beneficial effects of the above technical solution are as follows: by determining the conduction sequence of different valve plates in the converter valve, and sending the trigger angle pulse signal carrying the control command to the valve plates in the converter valve through a preset number of optical signal transmitters, the reliability of the received trigger angle pulse signal carrying the control command can be analyzed through the valve plates. When similar key signal segments exceed half of the total number, the working state of the valve plates in the converter valve is switched according to the conduction sequence, which ensures the control accuracy of the converter valve, improves the effect of flexible DC transmission, and ensures the stable operation of the flexible DC transmission process.

[0135] Example 7:

[0136] Based on Embodiment 6, this embodiment provides a control system for a flexible DC transmission converter valve, comprising an execution subunit including:

[0137] The switching monitoring subunit is used to monitor the current value of the valve plate flowing through the switching valve at various times in real time after the working state of the valve plate in the switching valve is switched to the conducting state, and to record the current value at each time.

[0138] The state switching subunit is used to determine the target time when the current value is 0 based on the recorded results, and to switch the valve plate that is currently in the conducting state to the off state based on the target time.

[0139] In this embodiment, the purpose of recording the current value at each moment is to determine the current value of each valve plate in the converter valve at different times, so as to facilitate the timely switching of the working state of the valve plate to the off state when the current value is 0.

[0140] In this embodiment, the target time refers to the time when the current flowing through the valve plate in the converter valve is 0.

[0141] The beneficial effects of the above technical solution are: by real-time monitoring of the current value flowing through each valve plate in the converter valve after it is turned on, and timely switching the working state of each valve plate in the converter valve from the on state to the off state when the current value is 0, the reliability of converting AC to DC is guaranteed, the control effect of the converter valve is further guaranteed, and the stable operation of the flexible DC transmission process is guaranteed.

[0142] Example 8:

[0143] Based on Embodiment 1, this embodiment provides a control system for a flexible DC transmission converter valve, including a safety protection module:

[0144] The back-check signal acquisition unit is used to acquire the internal voltage and internal current values ​​of the valve plate in the converter valve in real time based on the control results, convert the internal voltage and internal current values ​​into back-check optical signals, and feed back the back-check optical signals to the control terminal based on the optical fiber transmission link.

[0145] The model building unit is used to extract the target operating feature parameters of the valve plate in the converter valve, and use the target operating feature parameters as training samples to build a state evaluation model. At the same time, the acquisition time of the obtained return optical signal is segmented based on the preset time segmentation step size, and the sub-return optical signal corresponding to each time segment is determined based on the segmentation result.

[0146] The state analysis unit is used to determine the weighting coefficients of the internal voltage and internal current values ​​contained in the sub-return optical signal of each time period, and to determine the correspondence between the internal voltage and internal current values ​​contained in the sub-return optical signal of each time period based on the weighting coefficients. The correspondence and the sub-return optical signal corresponding to each time period are input into the state evaluation model for analysis to obtain the working state of the valve plate in each time period.

[0147] In this embodiment, the internal voltage value and internal current refer to the real-time operating voltage value and real-time operating current value of each valve plate in the converter valve when it is working.

[0148] In this embodiment, the back-detection optical signal refers to converting the internal voltage and internal current values ​​into digital signals, and then converting the data signals into optical signals to realize the acquisition and transmission of the working data of each valve plate.

[0149] In this embodiment, the target operating characteristic parameters are parameters used to characterize the operating conditions of each valve plate in the converter valve, specifically parameters such as the standard operating voltage and standard current.

[0150] In this embodiment, the preset time segmentation step size is pre-set and is used to define the standard for dividing the acquisition time corresponding to the return optical signal. It can be adjusted.

[0151] In this embodiment, the sub-return optical signal refers to the return optical signal corresponding to each time period obtained after dividing the acquisition time corresponding to the return optical signal, which is a part of the initially obtained return optical signal.

[0152] In this embodiment, the weighting coefficient is used to characterize the importance of the internal voltage and current values ​​contained in the back-detection optical signal in the operation of the valve plate.

[0153] In this embodiment, the correspondence is used to characterize the influence of the internal voltage and internal current values ​​contained in the sub-review optical signal of each time period on the working state of the valve plate.

[0154] The beneficial effects of the above technical solution are as follows: First, by collecting the internal voltage and current values ​​of each valve plate in the converter valve in real time, and feeding back the internal voltage and current values ​​as feedback optical signals to the control terminal, second, by extracting the target operating characteristic parameters of the valve plates in the converter valve, an accurate and effective state assessment model can be constructed. Finally, the obtained feedback optical signals are input into the constructed state assessment model for analysis, so as to accurately and effectively grasp the working state of each valve plate in the converter valve. This facilitates timely remedial measures when there are abnormalities in the converter valve, ensuring the reliability of flexible DC transmission while improving the safety factor of the converter valve operation.

[0155] Example 9:

[0156] Based on Example 8, this example provides a control system for a flexible DC transmission converter valve, including a state analysis unit:

[0157] The status acquisition subunit is used to acquire the working status of the valve plate in each time period and obtain the performance value of the valve plate in each time period based on the working status.

[0158] The comparison subunit is used to compare the performance value with the preset performance threshold, and when the performance value of the valve plate in the converter valve is lower than the preset performance threshold, it is determined that there is an abnormality in the converter valve, and the target abnormal valve plate is determined based on the determination result.

[0159] The safety protection subunit is used to generate trip control commands based on the target abnormal valve plate, and to perform trip operations on the target abnormal valve plate based on the trip control commands. At the same time, it determines the docking interface configuration parameters of the preset backup device, and switches the working process of the target abnormal valve plate based on the docking interface configuration parameters.

[0160] In this embodiment, the performance value is used to characterize the working performance of the converter valve at different times. The larger the performance value, the better the working state of the converter valve.

[0161] In this embodiment, the preset performance threshold is pre-set and is used to characterize the minimum operating performance standard of the converter valve.

[0162] In this embodiment, the target abnormal valve plate refers to the valve plate in the converter valve whose working state or performance value is abnormal, and there is at least one.

[0163] In this embodiment, the trip control command is used to control the target abnormal valve plate to perform a trip operation, thereby ensuring the safety of the converter valve.

[0164] In this embodiment, the preset backup device is pre-set and is used to switch the converter valve in a timely manner when the converter valve malfunctions, thereby ensuring the stable operation of flexible DC transmission.

[0165] In this embodiment, the docking interface configuration parameters are used to characterize the docking standards or docking requirements of the preset backup device during docking, specifically the interface type, etc.

[0166] In this embodiment, when the performance value of the valve plate in the converter valve is lower than a preset performance threshold value, it is determined that the converter valve is abnormal, and the target abnormal valve plate is identified based on the determination result, including:

[0167] The process involves obtaining the number of abnormal events recorded for the target abnormal valve plate, calculating the failure rate of the target abnormal valve plate based on the number of abnormal events, and predicting the remaining service life of the target abnormal valve plate based on the failure rate. Specific steps include:

[0168] The failure rate of the target abnormal valve plate is calculated using the following formula:

[0169]

[0170] Where η represents the failure rate of the target abnormal valve plate, and its value ranges from (0, 1); μ represents the error factor, and its value ranges from (0.01, 0.03); m represents the number of abnormalities of the target abnormal valve plate; M represents the total number of operations of the target abnormal valve plate; i represents the number of current components contained in the target abnormal valve plate, and its value ranges from [1, n]; n represents the total number of components contained in the target abnormal valve plate; q i This represents the amount of damage to the i-th component in the target abnormal valve plate; The weight of the impact of the loss of the i-th component in the target abnormal valve plate on the failure rate of the target abnormal valve plate is represented; P represents the total mass value of the target abnormal valve plate.

[0171] The remaining service life of the target abnormal valve plate is calculated using the following formula:

[0172] t=T-η*T*e ω ;

[0173] Where t represents the remaining service life of the target abnormal valve plate; T represents the theoretical service life of the target abnormal valve plate; η represents the failure rate of the target abnormal valve plate, and its value ranges from (0, 1); ω represents the aging factor of the target abnormal valve plate, and its value ranges from (0.02, 0.05).

[0174] Compare the calculated remaining useful life with the preset remaining useful life threshold;

[0175] If the calculated remaining service life is greater than or equal to the preset remaining service life threshold, it is determined that the remaining service life of the target abnormal valve plate is within the expected range, and the cause of the abnormality of the target abnormal valve plate is determined.

[0176] Based on the cause of the anomaly, the target solution strategy is matched from the preset solution strategy library, and the target abnormal valve plate is maintained based on the target solution strategy;

[0177] Otherwise, determine that the remaining service life of the target malfunctioning valve is not within the expected range, and replace the target malfunctioning valve.

[0178] The theoretical service life mentioned above refers to the maximum service life of the target abnormal valve plate when it leaves the factory.

[0179] The aforementioned preset remaining service life threshold is pre-set and is used to characterize the minimum remaining service life at which the target abnormal valve plate needs to be replaced. It can be adjusted.

[0180] The beneficial effects of the above technical solution are as follows: By determining the performance values ​​of different valve plates in the converter valve at each time period, it is convenient to switch the working process of the converter valve in a timely manner when there is an abnormality. Secondly, by calculating the failure rate of the converter valve, the remaining service life of the converter valve can be accurately and effectively predicted, which facilitates the timely replacement of the converter valve when it does not meet the usage requirements, thus ensuring the safety of flexible DC transmission. At the same time, it also improves the control effect of the converter valve of flexible DC transmission, ensuring the stable operation of flexible DC transmission.

[0181] Example 10:

[0182] Based on Example 8, this example provides a control system for a flexible DC transmission converter valve, including a state analysis unit:

[0183] The status monitoring subunit is used to acquire the working status of the valve plate in real time for each time period after it is in the off state, and to determine the real-time voltage value of the AC power on one side of the valve plate based on the working status.

[0184] The emergency analysis subunit is used to compare the real-time voltage value with the preset protection threshold of the valve plate, and send an emergency control command to the control terminal when the real-time voltage value is greater than or equal to the preset protection threshold.

[0185] The emergency subunit is used to temporarily open the valve plate in the converter valve based on emergency control commands, and restore the valve plate to the closed state when the current value becomes 0.

[0186] In this embodiment, the real-time voltage value refers to the magnitude of the AC voltage on the converter valve side.

[0187] In this embodiment, the preset protection threshold is set in advance and is used to characterize the maximum voltage withstand value of the valve plate.

[0188] In this embodiment, the emergency control command refers to the control command sent to the control terminal when the real-time voltage value is greater than or equal to the preset protection threshold, which is used to request the control terminal to switch the working state of the valve plate in the converter valve to the conducting state.

[0189] In this embodiment, temporary conduction refers to switching the valve plate to the conduction state when the real-time voltage value on one side of the valve plate in the converter valve is greater than the preset protection threshold. The purpose is to protect the valve plate from being broken down by high voltage, and at the same time, it is also convenient to convert AC power to DC power.

[0190] The beneficial effects of the above technical solution are: by monitoring the real-time voltage value of the valve plate in the off state, the valve plate in the converter valve is temporarily turned on when the real-time voltage value is greater than or equal to the preset protection threshold, thereby ensuring the safety and reliability of the converter valve during operation, and at the same time improving the stable operation effect of flexible DC transmission.

[0191] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A control system for a flexible DC transmission converter valve, characterized in that, include: The control signal receiving module is used to convert the firing angle control signal of the converter valve into a firing angle pulse signal, and send the firing angle pulse signal to the valve plate in the converter valve; The control module is used to monitor the highest AC voltage on one side of the converter valve, and when the highest AC voltage meets the requirements of flexible DC transmission, it controls the conduction state of the valve plate in the converter valve based on the trigger angle pulse signal. The safety protection module is used to acquire the return inspection signal of the valve plate of the converter valve in real time based on the control results, determine the working status of the valve plate based on the return inspection signal, and perform trip control when a fault exists. The control module includes: The voltage parameter setting unit is used to obtain the flexible DC transmission requirements, analyze the flexible DC transmission requirements, determine the DC reference voltage of each valve plate in the converter valve, and determine the reference reference voltage of each valve plate in the converter valve based on the working attributes of the converter valve. The voltage monitoring unit is used to acquire a set of real-time voltage values ​​of the AC power on one side of the converter valve based on a preset time interval, and to determine the target value point in a preset rectangular coordinate system based on the order of acquisition time of the acquired real-time voltage value set, and to determine the real-time voltage value change curve of the AC power based on the target value point. The judgment unit is used to extract the stable curve segment in the real-time voltage value change curve, determine the target voltage value of the stable curve segment, and determine that the flexible DC transmission requirements are met when the target voltage value is greater than both the DC reference voltage and the reference voltage. Based on the trigger angle pulse signal, the working state of the valve plate in the converter valve is switched to the conducting state.

2. The control system for a flexible DC transmission converter valve according to claim 1, characterized in that, The control signal receiving module includes: The signal receiving unit is used to obtain the target number of valve plates in the converter valve, and generate a firing angle control signal for each valve plate through the control terminal based on the target number. The signal processing unit is used to determine the processing clock parameters of the trigger angle control signal based on the preset conversion frequency, and to process the trigger angle control signal based on the processing clock parameters to obtain the initial trigger angle pulse signal. At the same time, it extracts the fluctuation amplitude and conversion period of the initial trigger angle pulse signal. The signal conversion unit is used to determine the zero-crossing point of the initial trigger angle pulse signal based on the fluctuation amplitude and the conversion period, and to adapt the signal waveform corresponding to the initial trigger angle pulse signal based on the zero-crossing point, and to obtain the final trigger angle pulse signal based on the adaptation result.

3. The control system for a flexible DC transmission converter valve according to claim 1, characterized in that, The control signal receiving module includes: The signal acquisition unit is used to acquire the obtained trigger angle pulse signal, extract the terminal identifier of the trigger angle pulse signal, and divide the trigger angle pulse signal based on the terminal identifier to obtain sub-trigger angle pulse signals; The link building unit is used to build fiber optic transmission links between the control terminal and each valve plate in the converter valve. At the same time, it converts the sub-triggered angle pulse signal into an optical signal based on a preset signal conversion device and buffers the optical signal in the queue to be transmitted. The signal transmission unit is used to transmit the optical signal buffered in the transmission queue to the corresponding valve plate in the corresponding converter valve through the optical fiber transmission link based on the terminal identifier, thereby completing the transmission of the trigger angle pulse signal.

4. The control system for a flexible DC transmission converter valve according to claim 3, characterized in that, Link building units include: The link monitoring subunit is used to acquire optical transmission link construction data in real time, determine the construction progress of optical transmission link in real time based on the construction data, and retrieve target test data from the preset test database when the optical transmission link is completed. The link testing subunit is used to determine the testing order of the optical transmission link, mark the optical transmission link based on the testing order, and transmit the target test data to the valve plate sequentially through the optical transmission link based on the marking results. The optimization subunit is used to monitor the feedback response of each valve based on the transmission results, and to complete the continuity verification of the optical transmission link when the feedback response meets the test requirements of the target test data.

5. The control system for a flexible DC transmission converter valve according to claim 1, characterized in that, The judgment unit includes: The result acquisition subunit is used to determine the conduction sequence of different valve plates in the converter valve when the requirements of flexible DC transmission are met. At the same time, it feeds back control requests to the control terminal, and the control terminal sends trigger angle pulse signals carrying control commands to the valve plates in the converter valve through a preset number of optical signal transmitters based on the control requests. The analysis subunit is used to extract key signal segments of trigger angle pulse signals carrying control commands sent by different preset optical signal transmitters received by the valve plate in the converter valve, and to determine the similarity of the key signal segments. The execution subunit is used to switch the working state of the valve plate in the converter valve to the conducting state according to the conduction sequence based on the received trigger angle pulse signal carrying the control command when the number of similar key signal segments exceeds half of the total.

6. The control system for a flexible DC transmission converter valve according to claim 5, characterized in that, The execution subunit includes: The switching monitoring subunit is used to monitor the current value of the valve plate flowing through the switching valve at various times in real time after the working state of the valve plate in the switching valve is switched to the conducting state, and to record the current value at each time. The state switching subunit is used to determine the target time when the current value is 0 based on the recorded results, and to switch the valve plate that is currently in the conducting state to the off state based on the target time.

7. The control system for a flexible DC transmission converter valve according to claim 1, characterized in that, The security protection module includes: The back-check signal acquisition unit is used to acquire the internal voltage and internal current values ​​of the valve plate in the converter valve in real time based on the control results, convert the internal voltage and internal current values ​​into back-check optical signals, and feed back the back-check optical signals to the control terminal based on the optical fiber transmission link. The model building unit is used to extract the target operating feature parameters of the valve plate in the converter valve, and use the target operating feature parameters as training samples to build a state evaluation model. At the same time, the acquisition time of the obtained return optical signal is segmented based on the preset time segmentation step size, and the sub-return optical signal corresponding to each time segment is determined based on the segmentation result. The state analysis unit is used to determine the weighting coefficients of the internal voltage and internal current values ​​contained in the sub-return optical signal of each time period, and to determine the correspondence between the internal voltage and internal current values ​​contained in the sub-return optical signal of each time period based on the weighting coefficients. The correspondence and the sub-return optical signal corresponding to each time period are input into the state evaluation model for analysis to obtain the working state of the valve plate in each time period.

8. The control system for a flexible DC transmission converter valve according to claim 7, characterized in that, The state analysis unit includes: The status acquisition subunit is used to acquire the working status of the valve plate in each time period and obtain the performance value of the valve plate in each time period based on the working status. The comparison subunit is used to compare the performance value with the preset performance threshold, and when the performance value of the valve plate in the converter valve is lower than the preset performance threshold, it is determined that there is an abnormality in the converter valve, and the target abnormal valve plate is determined based on the determination result. The safety protection subunit is used to generate trip control commands based on the target abnormal valve plate, and to perform trip operations on the target abnormal valve plate based on the trip control commands. At the same time, it determines the docking interface configuration parameters of the preset backup device, and switches the working process of the target abnormal valve plate based on the docking interface configuration parameters.

9. The control system for a flexible DC transmission converter valve according to claim 7, characterized in that, The state analysis unit includes: The status monitoring subunit is used to acquire the working status of the valve plate in real time for each time period after it is in the off state, and to determine the real-time voltage value of the AC power on one side of the valve plate based on the working status. The emergency analysis subunit is used to compare the real-time voltage value with the preset protection threshold of the valve plate, and send an emergency control command to the control terminal when the real-time voltage value is greater than or equal to the preset protection threshold. The emergency subunit is used to temporarily open the valve plate in the converter valve based on emergency control commands, and restore the valve plate to the closed state when the current value becomes 0.

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