A converter station valve external cooling system circulating heating temperature control device and method

Abstract

The present invention discloses a circulating heating temperature control device and method for an external cooling system of a converter station valve, which relates to the technical field of temperature control. The device and method calculate the load fluctuation index of the converter station valve within a preset time period and compare it with a preset threshold value to determine whether the load fluctuation is a short-term fluctuation. If the load fluctuation is not a short-term fluctuation, the ambient temperature and humidity, usage time, external cooling system coolant temperature and pipeline flow rate of the converter station valve are obtained, and the coolant flow adjustment coefficient is calculated in combination with the load fluctuation index. The final flow is obtained based on the currently set coolant flow and adjustment coefficient, and is used for temperature control. In this way, it is possible to accurately determine whether the load fluctuation is a short-term fluctuation or a long-term change, and reasonably adjust the coolant flow to avoid overreaction, reduce energy waste and equipment wear. In addition, the coolant flow is intelligently adjusted to ensure the best temperature control effect of the converter station valve, reduce damage to equipment, and improve system stability and efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature control, and in particular to a temperature control device and method for circulating heating of a converter station valve external cooling system. Background Art

[0002] In the high-voltage direct current (HVDC) transmission system, the converter valve of the converter station is one of the core equipment, which undertakes the key task of converting alternating current into direct current. Since the converter valve generates a large amount of heat during operation, the role of the temperature control system is particularly important. In order to ensure the normal operation of the converter valve and its related equipment and avoid equipment damage or performance degradation due to excessive temperature, the converter station is usually equipped with an external valve cooling system. The cooling system usually adopts liquid cooling, and the heat generated is removed by the coolant flowing through the cooling pipe of the converter valve assembly. In order to ensure the cooling effect, the system will be equipped with a temperature sensor to monitor the temperature of the converter valve in real time. When the temperature exceeds the preset safety threshold, the external cooling system will automatically start the adjustment mechanism, such as increasing the flow of coolant to accelerate the heat dissipation process, to ensure that the equipment always operates within an appropriate temperature range, thereby improving the safety and reliability of the converter station.

[0003] However, the above method of only taking action by setting a temperature threshold has certain defects, because this method is too dependent on a single temperature trigger condition and may not be able to respond to the temperature change of the converter station valve in a timely manner; therefore, in order to ensure that the temperature of the converter station valve can be controlled in a timely manner, the existing method will control the temperature of the converter station valve through an external cooling system according to the load fluctuation of the converter station valve. For example, if the load increases, the temperature of the converter station valve is controlled before the temperature of the converter station valve reaches the preset temperature threshold. This predictive control method based on load changes can respond quickly when the load increases, thereby improving the temperature control accuracy and response speed of the converter station;

[0004] When the temperature of the converter station valve is controlled by the external cooling system through the load fluctuation, generally, the load fluctuation of the converter station valve is detected and the temperature is controlled by the external cooling system; however, in the actual operation, the load fluctuation of the converter station valve may be only a short-term fluctuation. If it is not possible to judge whether the load fluctuation of the converter station valve is a short-term fluctuation or a long-term change, the temperature control is performed immediately by changing the coolant flow of the external cooling system, which may cause the external cooling to cause overreaction, thereby wasting energy and increasing equipment wear, causing unnecessary overreaction and waste of resources; in addition, when the temperature is controlled by changing the coolant flow of the external cooling system, if the coolant flow cannot be intelligently adjusted according to the actual state to control the temperature of the converter station valve, it may lead to poor cooling effect, damage to the converter valve, and reduce its service life. Summary of the invention

[0005] The purpose of the present invention is to solve the above-mentioned problems and to provide a circulating heating temperature control device and method for a converter station valve external cooling system.

[0006] In a first aspect of the present invention, a method for controlling the circulating heating temperature of a converter station valve external cooling system is first proposed. The method comprises:

[0007] Obtaining the power of the converter station valve within a preset time period, and calculating the load fluctuation index of the converter station valve according to the power;

[0008] Comparing the load fluctuation index with a preset load fluctuation index threshold, and judging whether the load fluctuation of the converter station valve is a short-term fluctuation according to the comparison result;

[0009] When the load fluctuation of the converter station valve is not a short-term fluctuation, the temperature and humidity of the environment where the converter station valve is located, the use time of the converter station valve, the temperature of the coolant of the external cooling system and the flow rate of the external cooling system pipeline are obtained, and the coolant flow adjustment coefficient is obtained in combination with the load fluctuation index;

[0010] The final coolant flow rate is obtained according to the coolant flow rate and the coolant flow rate adjustment coefficient currently set in the external cooling system, and the temperature of the converter station valve is controlled according to the final coolant flow rate.

[0011] Optionally, calculating the load fluctuation index of the converter station valve according to the power includes:

[0012] Acquire the power of the converter station valve based on the time sequence within a preset time period as a power sequence;

[0013] The power sequence is decomposed into several levels by Daubechies wavelet, and the numerical sequence corresponding to the low-frequency components and the numerical sequence corresponding to the high-frequency components of each level are output;

[0014] Calculate the sum of the numerical sequences corresponding to the low-frequency components at each level to obtain the low-frequency component energy at the corresponding level, and calculate the sum of the low-frequency component energies at all levels to obtain the total low-frequency component energy;

[0015] Calculate the sum of the numerical sequences corresponding to the high-frequency components of each level to obtain the high-frequency component energy of the corresponding level, and calculate the sum of the high-frequency component energies of all levels to obtain the total high-frequency component energy;

[0016] The sum of the total low-frequency component energy and the total high-frequency component energy is calculated as the total energy, and the total low-frequency component energy is divided by the total energy to obtain the load fluctuation index of the converter station valve.

[0017] Optionally, judging whether the load fluctuation of the converter station valve is a short-term fluctuation according to the comparison result includes:

[0018] If the load fluctuation index is less than the preset load fluctuation index threshold, the load fluctuation of the converter station valve is a short-term fluctuation. At this time, there is no need to adjust the coolant flow of the external cooling system of the converter station valve, and the temperature of the converter station valve is still controlled according to the original coolant flow of the external cooling system;

[0019] If the load fluctuation index is not less than the preset load fluctuation index threshold, the load fluctuation of the converter station valve is not a short-term fluctuation but a long-term change. In this case, it is necessary to adjust the coolant flow of the converter station valve external cooling system to cool the converter station valve.

[0020] Optionally, the temperature and humidity of the environment where the converter station valve is located, the use time of the converter station valve, the temperature of the coolant of the external cooling system and the flow rate of the external cooling system pipeline are obtained, and the coolant flow adjustment coefficient is obtained in combination with the load fluctuation index, including:

[0021] The temperature and humidity of the environment where the converter station valve is located within the preset time period are obtained, and the temperature and humidity deviation coefficient is calculated. The calculation formula is: Wherein DH represents the temperature and humidity deviation coefficient, T(t) and s(t) represent the temperature data and humidity data of the environment where the converter station valve is located in a preset time period, respectively, [t1, t2] represents the time period when the temperature data is greater than the preset maximum temperature corresponding to the coolant flow rate originally set for the external cooling system, [t3, t4] represents the time period when the temperature data is greater than the preset maximum humidity corresponding to the coolant flow rate originally set for the external cooling system, and α and β represent the preset influence weights of the temperature data and the humidity data, respectively;

[0022] The coolant flow regulation coefficient is obtained according to the temperature and humidity deviation coefficient, the use time of the converter station valve, the temperature of the coolant in the external cooling system, the flow rate of the external cooling system pipeline and the load fluctuation index.

[0023] Optionally, the coolant flow adjustment coefficient is obtained according to the temperature and humidity deviation coefficient, the use time of the converter station valve, the temperature of the coolant in the external cooling system, the flow rate of the external cooling system pipeline, and the load fluctuation index, including:

[0024] Obtain the time when the converter station valve is put into use and the average usable time of the converter station valve, and divide the time when the valve is put into use by the average usable time to obtain the service life coefficient;

[0025] Obtain the average maintenance time interval of the converter station valve and the time interval from the current time to the last maintenance, and subtract the time interval from the current time to the last maintenance from the average maintenance time interval to obtain the maintenance interval coefficient;

[0026] Obtain the current temperature of the coolant in the external cooling system, and subtract the preset maximum temperature threshold from the current temperature of the coolant to obtain a coolant temperature deviation value;

[0027] The coolant flow regulation coefficient is obtained according to the temperature and humidity deviation coefficient, service life coefficient, maintenance interval coefficient, coolant temperature deviation value, flow velocity of the external cooling system pipeline and load fluctuation index.

[0028] Optionally, the coolant flow adjustment coefficient is obtained according to the temperature and humidity deviation coefficient, the service life coefficient, the maintenance interval coefficient, the coolant temperature deviation value, the flow rate of the external cooling system pipeline, and the load fluctuation index, including:

[0029] Obtain the flow rate of the external cooling system pipeline at each moment in a preset time period to obtain a flow rate sequence, and calculate the difference between the preset minimum flow rate and each flow rate in the flow rate sequence to obtain a flow rate difference sequence; calculate the mean of the flow rate difference sequence as the flow rate deviation value;

[0030] The coolant flow adjustment coefficient is obtained according to the temperature and humidity deviation coefficient, service life coefficient, maintenance interval coefficient, coolant temperature deviation value, flow rate deviation value and load fluctuation index. The calculation formula is:

[0031]

[0032] Wherein, HJY is the coolant flow adjustment coefficient, DH, FG, KU, GT, FD, SE are respectively the temperature and humidity deviation coefficient, service life coefficient, maintenance interval coefficient, coolant temperature deviation value, flow rate deviation value and load fluctuation index, a1, a2, a3, a4, a5, a6 are respectively the preset proportional coefficients of DH, FG, KU, GT, FD, SE, and a1, a2, a3, a4, a5, a6 are all greater than 0.

[0033] Optionally, obtaining the final coolant flow rate according to the coolant flow rate and the coolant flow rate adjustment coefficient currently set for the external cooling system includes:

[0034] HGD=HK×(1+HJY)

[0035] Where HGD is the final coolant flow rate, HK is the coolant flow rate currently set for the external cooling system, and HJY is the coolant flow rate adjustment coefficient.

[0036] In a second aspect of the present invention, a temperature control device for a converter station valve external cooling system is provided, the device comprising:

[0037] Load fluctuation module: obtains the power of the converter station valve within a preset time period, and calculates the load fluctuation index of the converter station valve according to the power;

[0038] Judgment module: compares the load fluctuation index with a preset load fluctuation index threshold, and judges whether the load fluctuation of the converter station valve is a short-term fluctuation according to the comparison result;

[0039] Flow regulation module: When the load fluctuation of the converter station valve is not a short-term fluctuation, the temperature and humidity of the environment where the converter station valve is located, the use time of the converter station valve, the temperature of the coolant in the external cooling system and the flow rate of the external cooling system pipeline are obtained, and the coolant flow regulation coefficient is obtained in combination with the load fluctuation index;

[0040] Temperature control module: obtains the final coolant flow rate according to the coolant flow rate and coolant flow rate adjustment coefficient currently set in the external cooling system, and performs temperature control on the converter station valve according to the final coolant flow rate.

[0041] Beneficial effects of the present invention:

[0042] The present invention proposes a circulating heating temperature control device and method for an external cooling system of a converter station valve. The device calculates the load fluctuation index of the converter station valve by obtaining the power of the converter station valve within a preset time period; compares the load fluctuation index with a preset load fluctuation index threshold, and determines whether the load fluctuation of the converter station valve is a short-term fluctuation according to the comparison result; when the load fluctuation of the converter station valve is not a short-term fluctuation, obtains the temperature and humidity of the environment in which the converter station valve is located, the use time of the converter station valve, the temperature of the coolant of the external cooling system and the flow rate of the external cooling system pipeline, and obtains the coolant flow adjustment coefficient in combination with the load fluctuation index; and adjusts the coolant flow according to the coolant flow currently set in the external cooling system and the coolant flow The final coolant flow rate is obtained by adjusting the coefficient, and the temperature of the converter station valve is controlled according to the final coolant flow rate. In this way, in the actual operation process, it is possible to reasonably judge whether the load fluctuation of the converter station valve is a short-term fluctuation or a long-term change, and according to the judgment result, the coolant flow rate of the external cooling system is reasonably changed to perform temperature control, thereby reducing excessive reaction caused by external cooling, thereby reducing energy waste and reducing equipment wear. In addition, when the temperature is controlled by changing the coolant flow rate of the external cooling system, the coolant flow rate can be intelligently adjusted according to the actual state to control the temperature of the converter station valve, which can ensure better cooling effect and reduce damage to the converter valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a flow chart of the control method of the present invention;

[0044] Figure 2 It is a principle framework diagram of the control device of the present invention. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0047] The embodiment of the present invention provides a temperature control system for circulating heating of a converter station valve external cooling system. Figure 1 , Figure 1 A flow chart of a converter station valve external cooling system circulating heating temperature control provided by an embodiment of the present invention. The method comprises the following steps:

[0048] Obtaining the power of the converter station valve within a preset time period, and calculating the load fluctuation index of the converter station valve according to the power;

[0049] Comparing the load fluctuation index with a preset load fluctuation index threshold, and judging whether the load fluctuation of the converter station valve is a short-term fluctuation according to the comparison result;

[0050] When the load fluctuation of the converter station valve is not a short-term fluctuation, the temperature and humidity of the environment where the converter station valve is located, the use time of the converter station valve, the temperature of the coolant of the external cooling system and the flow rate of the external cooling system pipeline are obtained, and the coolant flow adjustment coefficient is obtained in combination with the load fluctuation index;

[0051] The final coolant flow rate is obtained according to the coolant flow rate and the coolant flow rate adjustment coefficient currently set in the external cooling system, and the temperature of the converter station valve is controlled according to the final coolant flow rate.

[0052] Based on a circulating heating temperature control of an external cooling system for a converter station valve provided in an embodiment of the present invention, through the above-mentioned method, during actual operation, it is possible to reasonably judge whether the load fluctuation of the converter station valve is a short-term fluctuation or a long-term change, and reasonably change the coolant flow of the external cooling system to perform temperature control according to the judgment result, thereby reducing excessive reaction caused by external cooling, thereby reducing energy waste and reducing equipment wear; in addition, when performing temperature control by changing the coolant flow of the external cooling system, the coolant flow can be intelligently adjusted according to the actual state to control the temperature of the converter station valve, thereby ensuring a better cooling effect and reducing damage to the converter valve.

[0053] In one embodiment, obtaining the power of the converter station valve within a preset time period, and calculating the load fluctuation index of the converter station valve according to the power includes:

[0054] Acquire the power of the converter station valve based on the time sequence within a preset time period as a power sequence;

[0055] The power sequence is decomposed into several levels by Daubechies wavelet, and the numerical sequence corresponding to the low-frequency components and the numerical sequence corresponding to the high-frequency components of each level are output;

[0056] Calculate the sum of the numerical sequences corresponding to the low-frequency components at each level to obtain the low-frequency component energy at the corresponding level, and calculate the sum of the low-frequency component energies at all levels to obtain the total low-frequency component energy;

[0057] Calculate the sum of the numerical sequences corresponding to the high-frequency components of each level to obtain the high-frequency component energy of the corresponding level, and calculate the sum of the high-frequency component energies of all levels to obtain the total high-frequency component energy;

[0058] The sum of the total low-frequency component energy and the total high-frequency component energy is calculated as the total energy, and the total low-frequency component energy is divided by the total energy to obtain the load fluctuation index of the converter station valve.

[0059] It should be noted that converter stations are usually equipped with advanced monitoring systems that can measure and record the power output of converter station valves in real time, forming time series data and providing comprehensive data support for subsequent load fluctuation analysis.

[0060] It should be noted that the preset time period is set by professionals based on actual conditions, and is usually reasonably arranged according to the working cycle of the converter station valve, load change characteristics and environmental factors. Professionals will analyze the temperature change law of the converter station valve under different load levels and working conditions, and determine the appropriate time period length based on the historical data of equipment operation. The setting of these preset time periods not only takes into account the long-term operating stability of the equipment, but also takes into account the response speed of short-term load fluctuations.

[0061] It should be noted that the power of the converter station valve is chosen as the basis for load calculation, mainly because power is a direct indicator of the working state and load change of power equipment; power changes directly reflect the load fluctuation of the converter station valve, whether the load increases or decreases, it will be reflected in the power; through the analysis of the power sequence, the real-time fluctuation of the load can be accurately captured, which is crucial for temperature control; the temperature of the converter station valve is usually closely related to the power output, and the increase in power is often accompanied by an increase in heat. If the power fluctuation cannot be sensed in time and the coolant flow cannot be adjusted, it may cause the equipment to overheat and damage the normal operation life of the equipment; using power data for load fluctuation analysis can provide more direct and accurate load change information, so that the temperature control system can be dynamically adjusted based on the real-time load status to avoid overcooling or insufficient cooling caused by environmental or instantaneous fluctuations, which not only improves the response accuracy of the temperature control system, but also improves the safety, stability and service life of the converter station valve. At the same time, through long-term monitoring of power data, the long-term change trend of the load can be more accurately identified, the temperature control strategy can be adjusted in time, the use efficiency of cooling resources can be further optimized, and unnecessary energy waste can be avoided.

[0062] It should be noted that the distinction between low-frequency and high-frequency components is as follows: Daubechies wavelet decomposition can divide the signal into different frequency bands, in which the low-frequency part represents the long-term trend and the high-frequency part represents the short-term fluctuation. If the ratio of the total low-frequency component energy to the total energy is large, it means that the load fluctuation (such as power increase) of the converter station valve is not just a short-term fluctuation, but a long-term trend. At this time, it is necessary to change the coolant flow of the external cooling system for temperature control. On the contrary, if the ratio of the total low-frequency component energy to the total energy is small, it means that the load fluctuation (such as power increase) of the converter station valve is likely to be a short-term fluctuation, which will recover in a short time. At this time, there is no need to change the coolant flow of the external cooling system for temperature control. It is sufficient to control the temperature of the converter station valve according to the original coolant flow of the external cooling system.

[0063] In one implementation, this method can effectively avoid overreacting to the cooling system during short-term fluctuations, reducing unnecessary energy consumption and equipment wear; and in the event of long-term changes, timely adjust the coolant flow to ensure the safe operation of the converter station valve.

[0064] In one implementation, Daubechies wavelet is used to decompose the power sequence of the converter station valve, mainly because it has superior time-frequency localization characteristics and is particularly suitable for analyzing non-stationary signals and signals with mutation characteristics. In the power sequence of the converter station valve, the power change may have instantaneous fluctuations and long-term trends, and these fluctuations are usually nonlinear and non-stationary, and the traditional Fourier transform cannot effectively capture these characteristics. Daubechies wavelet can decompose the signal into low-frequency components and high-frequency components of different frequency bands through multi-level decomposition. The low-frequency part usually represents the long-term trend of the signal, while the high-frequency part reflects short-term fluctuations or noise. In this way, the different levels of fluctuations in the power sequence can be clearly distinguished, the nature of the load change can be more accurately identified, and whether it is a short-term fluctuation or a long-term load change. Compared with other wavelets, Daubechies wavelet has better tight support and less computational complexity, and is suitable for real-time or periodic signal analysis. In addition, Daubechies wavelet has good time resolution and can accurately capture mutation points and rapid changes in the power sequence, thereby helping the temperature control system to respond to load fluctuations in a timely manner, optimize the adjustment of coolant flow, and avoid unnecessary energy waste and equipment loss. Therefore, the use of Daubechies wavelet not only improves the accuracy of load fluctuation index calculation, but also enhances the flexibility and real-time response capability of the converter station valve temperature control system.

[0065] In one embodiment, comparing the load fluctuation index with a preset load fluctuation index threshold, and judging whether the load fluctuation of the converter station valve is a short-term fluctuation according to the comparison result includes:

[0066] If the load fluctuation index is less than the preset load fluctuation index threshold, the load fluctuation of the converter station valve is a short-term fluctuation. At this time, there is no need to adjust the coolant flow of the external cooling system of the converter station valve, and the temperature of the converter station valve is still controlled according to the original coolant flow of the external cooling system;

[0067] If the load fluctuation index is not less than the preset load fluctuation index threshold, the load fluctuation of the converter station valve is not a short-term fluctuation but a long-term change. In this case, it is necessary to adjust the coolant flow of the converter station valve external cooling system to cool the converter station valve.

[0068] It should be noted that the preset load fluctuation index threshold is set by professionals based on actual conditions and will not be limited or elaborated on in detail.

[0069] It should be noted that comparing the load fluctuation index with the preset load fluctuation index threshold is a key step in determining whether the load fluctuation of the converter station valve is a short-term fluctuation. The load fluctuation index reflects the ratio of long-term trends to short-term fluctuations in the power sequence. This ratio can effectively distinguish the nature of the load fluctuation; if the load fluctuation index is less than the preset load fluctuation index threshold, it means that the power change is mainly caused by short-term fluctuations or noise, the load fluctuation amplitude is small, and the change duration is short. In this case, the temperature control system can maintain the existing coolant flow and the original temperature control strategy, because the system believes that such fluctuations will not have a significant impact on the temperature and operating safety of the equipment, and will return to normal levels in a short period of time, so there is no need to overreact.

[0070] If the load fluctuation index is not less than the preset load fluctuation index threshold, this indicates that the power fluctuation is large, which may be caused by long-term load changes or systematic fluctuations of the equipment; at this time, the load change is not just a short-term fluctuation, which may mean that the equipment is in a higher load state, or there is a continuous load increase trend; in order to cope with this long-term change, the coolant flow of the converter station valve external cooling system must be adjusted to ensure that the cooling effect is sufficient to cope with higher load pressures and prevent equipment damage or efficiency reduction due to excessive temperature; by increasing the coolant flow, the heat dissipation can be accelerated to ensure that the equipment operates within a safe temperature range, thereby improving the stability and reliability of the converter station. Reasonable temperature control strategies can effectively avoid unnecessary energy waste, while extending the service life of equipment and improving the operating efficiency of converter station valves under different load conditions.

[0071] In one embodiment, when the load fluctuation of the converter station valve is not a short-term fluctuation, the temperature and humidity of the environment where the converter station valve is located, the use time of the converter station valve, the temperature of the coolant of the external cooling system and the flow rate of the external cooling system pipeline are obtained, and the coolant flow adjustment coefficient is obtained in combination with the load fluctuation index, including:

[0072] The temperature and humidity of the environment where the converter station valve is located within the preset time period are obtained, and the temperature and humidity deviation coefficient is calculated. The calculation formula is: Wherein DH represents the temperature and humidity deviation coefficient, T(t) and s(t) represent the temperature data and humidity data of the environment where the converter station valve is located in a preset time period, respectively, [t1, t2] represents the time period when the temperature data is greater than the preset maximum temperature corresponding to the coolant flow rate originally set for the external cooling system, [t3, t4] represents the time period when the temperature data is greater than the preset maximum humidity corresponding to the coolant flow rate originally set for the external cooling system, and α and β represent the preset influence weights of the temperature data and the humidity data, respectively;

[0073] The coolant flow regulation coefficient is obtained according to the temperature and humidity deviation coefficient, the use time of the converter station valve, the temperature of the coolant in the external cooling system, the flow rate of the external cooling system pipeline and the load fluctuation index.

[0074] It should be noted that α and β are set by professionals according to actual conditions, and generally the sum of α and β is 1. The specific values ​​of α and β depend on actual conditions and are not limited or elaborated.

[0075] It should be noted that the preset maximum temperature and the preset maximum humidity are set by professionals based on actual conditions and are not limited or elaborated on.

[0076] It should be noted that the temperature and humidity data of the environment in which the converter station is located within the preset time period can be collected in real time through environmental monitoring equipment (such as temperature and humidity sensors) installed around the converter station. These sensors can continuously monitor and record changes in the temperature and humidity of the environment, and transmit the data to the central control system for analysis. The data obtained by these devices can accurately reflect the temperature and humidity conditions at the location of the converter station, providing a real-time basis for the adjustment of the cooling system.

[0077] It should be noted that the temperature and humidity deviation coefficient refers to the degree to which the temperature around the converter station valve is greater than the preset maximum temperature corresponding to the coolant flow originally set by the external cooling system, and the degree to which the humidity around the converter station valve is greater than the preset maximum humidity corresponding to the coolant flow originally set by the external cooling system; if the temperature and humidity deviation coefficient is larger, it means that the temperature and humidity around the converter station valve are larger, then it is necessary to increase the coolant flow of the external cooling system to control the temperature of the converter station valve, because the larger the temperature and humidity deviation coefficient, the more the ambient temperature and humidity around the converter station valve are higher than the preset value, resulting in reduced heat exchange efficiency, thereby increasing the heat dissipation burden of the converter station valve. In this case, in order to effectively maintain the normal operating temperature of the converter station valve, the coolant flow of the external cooling system must be increased to cope with the additional heat load caused by environmental changes by strengthening the cooling capacity, so as to avoid damage to the equipment or affect its stable operation due to excessive temperature or humidity.

[0078] In one implementation, the benefits of analyzing the temperature and humidity deviation coefficient for determining how much to increase the coolant flow of the external cooling system are as follows: through the temperature and humidity deviation coefficient, the gap between the current environment and the preset cooling conditions can be accurately assessed, thereby avoiding overreaction or insufficient cooling; if the temperature and humidity deviation coefficient is large, the system can appropriately increase the coolant flow based on this data to ensure that the heat dissipation requirements of the converter station valve are met, avoiding equipment overheating or performance degradation due to insufficient cooling; and if the temperature and humidity deviation coefficient is small, the system's coolant flow does not need to be increased too much, just an appropriate increase is sufficient, thereby saving energy and reducing unnecessary equipment wear; through this method, the external cooling system can be intelligently adjusted according to real-time environmental changes, optimize the cooling effect, and improve the efficiency and stability of the overall system.

[0079] In one embodiment, the coolant flow adjustment coefficient is obtained according to the temperature and humidity deviation coefficient, the use time of the converter station valve, the temperature of the coolant in the external cooling system, the flow rate of the external cooling system pipeline, and the load fluctuation index, including:

[0080] Obtain the time when the converter station valve is put into use and the average usable time of the converter station valve, and divide the time when the valve is put into use by the average usable time to obtain the service life coefficient;

[0081] Obtain the average maintenance time interval of the converter station valve and the time interval from the current time to the last maintenance, and subtract the time interval from the current time to the last maintenance from the average maintenance time interval to obtain the maintenance interval coefficient;

[0082] Obtain the current temperature of the coolant in the external cooling system, and subtract the preset maximum temperature threshold from the current temperature of the coolant to obtain a coolant temperature deviation value;

[0083] The coolant flow regulation coefficient is obtained according to the temperature and humidity deviation coefficient, service life coefficient, maintenance interval coefficient, coolant temperature deviation value, flow velocity of the external cooling system pipeline and load fluctuation index.

[0084] It should be noted that the commissioning time and average usable time of the converter station valve can be obtained through the installation records and historical maintenance records in the converter station valve management system; the average maintenance time interval and the last maintenance time of the converter station valve can be extracted through the converter station valve maintenance log or data in the automatic maintenance system; the current temperature of the coolant can be obtained through real-time monitoring data of the temperature sensor in the external cooling system; the preset maximum temperature threshold is set by professionals based on actual conditions, and no specific restrictions or elaboration are made.

[0085] It should be noted that the larger the service life coefficient of the converter station valve, the more it is necessary to increase the coolant flow of the external cooling system to control the temperature of the converter station valve, because the larger the service life coefficient, the longer the equipment has been running, and the degree of aging of the equipment may be higher relative to its expected average service life. As the equipment ages, its heat dissipation efficiency may gradually decrease, and problems such as reduced fan efficiency, dust accumulation in the cooling pipes, and component wear may occur. These factors will lead to a decrease in the overall performance of the cooling system, which in turn affects the temperature control effect. In order to ensure that the converter station valve maintains a safe operating temperature during high-load operation and avoid equipment overheating or failure, it is necessary to increase the coolant flow of the external cooling system in a timely manner to improve the heat dissipation capacity and ensure that the equipment can still get sufficient cooling support during the aging process to ensure its safe and stable operation.

[0086] It should be noted that when the maintenance interval coefficient is larger, it is more necessary to increase the coolant flow of the external cooling system to control the temperature of the converter station valve, because the larger the maintenance interval coefficient, the longer the time since the last maintenance, and the maintenance and maintenance of the equipment may have lagged behind. As the equipment has not been maintained for a long time, the performance of the cooling system may gradually decline. For example, the fan may have reduced efficiency, the radiator may be dusty, and the pipeline may be blocked, all of which will directly affect the cooling effect. Without timely repairs and maintenance, the equipment may face the risk of overheating, especially when the load fluctuates greatly. Therefore, in order to compensate for the decrease in cooling efficiency caused by lack of maintenance, it is necessary to increase the coolant flow of the external cooling system to ensure that the equipment can still maintain a suitable operating temperature under poor heat dissipation conditions, and avoid equipment damage or system failure caused by overheating.

[0087] It should be noted that when the coolant temperature deviation value is larger, it is more necessary to increase the coolant flow of the external cooling system to control the temperature of the converter station valve, because the larger the coolant temperature deviation value, it means that the current temperature of the coolant in the external cooling system is already much higher than the preset maximum temperature threshold. This usually indicates that the heat dissipation effect of the cooling system is insufficient, which may be caused by insufficient coolant flow, high ambient temperature, or performance degradation of the system itself. If the coolant flow is not adjusted in time, the temperature of the converter station valve may be too high, affecting the normal operation of the equipment, and may even cause equipment failure or damage. Therefore, in order to ensure that the converter station valve operates stably within the safe temperature range, the coolant flow must be increased to enhance the heat dissipation capacity of the cooling system, reduce the equipment temperature, prevent the risks caused by excessive temperature, and ensure the reliability and safety of the system.

[0088] In one embodiment, the coolant flow rate adjustment coefficient is obtained according to the temperature and humidity deviation coefficient, the service life coefficient, the maintenance interval coefficient, the coolant temperature deviation value, the flow rate of the external cooling system pipeline, and the load fluctuation index, including:

[0089] Obtain the flow rate of the external cooling system pipeline at each moment in a preset time period to obtain a flow rate sequence, and calculate the difference between the preset minimum flow rate and each flow rate in the flow rate sequence to obtain a flow rate difference sequence; calculate the mean of the flow rate difference sequence as the flow rate deviation value;

[0090] The coolant flow adjustment coefficient is obtained according to the temperature and humidity deviation coefficient, service life coefficient, maintenance interval coefficient, coolant temperature deviation value, flow rate deviation value and load fluctuation index. The calculation formula is:

[0091]

[0092] It should be noted that a1, a2, a3, a4, a5, and a6 are set by professionals according to actual conditions. Generally, the sum of a1, a2, a3, a4, a5, and a6 is 1, and the specific values ​​are not limited. In addition, before calculating the coolant flow adjustment coefficient, it is necessary to remove the units of the temperature and humidity deviation coefficient, the service life coefficient, the maintenance interval coefficient, the coolant temperature deviation value, the flow rate deviation value, and the load fluctuation index before calculating;

[0093] It should be noted that when the flow rate deviation value is larger, it is more necessary to increase the coolant flow rate of the external cooling system to control the temperature of the converter station valve, because the flow rate deviation value reflects the difference between the actual flow rate of the coolant and the preset minimum flow rate. When the flow rate deviation value is large, it means that the coolant flow rate fails to meet the expected minimum requirement, resulting in insufficient cooling effect and unable to effectively remove the heat generated by the converter station valve. In order to ensure that the temperature of the converter station valve can be maintained within a safe range, the cooling efficiency must be improved by increasing the coolant flow rate. This not only helps to reduce the equipment temperature and prevent overheating, but also prevents equipment damage, reduced system efficiency and energy waste caused by excessive temperature. Therefore, when the flow rate deviation is large, increasing the coolant flow rate is a necessary adjustment measure to ensure the normal operation of the converter station valve and the stability of the system.

[0094] It should be noted that the larger the coolant flow rate adjustment coefficient is, the greater the amplitude of the coolant flow rate in the external cooling system of the converter station valve needs to be increased, and the converter station valve is cooled according to the amplified coolant flow rate, that is, temperature control; because a higher adjustment coefficient indicates a stronger cooling demand. Increasing the coolant flow rate can improve the cooling efficiency of the converter station valve and accelerate the removal of heat, thereby reducing the operating temperature of the converter station valve and preventing the equipment from overheating. By adjusting the coolant flow rate, the temperature can be controlled more accurately to keep it within a safe and stable range, avoiding equipment performance degradation or damage due to excessive temperature. In addition, the increased coolant flow rate is not only a response to the current load conditions, but also takes into account multiple factors such as temperature and humidity deviation, equipment aging, and flow rate deviation, ensuring that the temperature can be effectively adjusted in various environments and equipment conditions to ensure the safe operation of the converter station valve.

[0095] In one embodiment, obtaining the final coolant flow rate according to the coolant flow rate and the coolant flow rate adjustment coefficient currently set in the external cooling system includes:

[0096] HGD=HK×(1+HJY)

[0097] Where HGD is the final coolant flow rate, HK is the coolant flow rate currently set for the external cooling system, and HJY is the coolant flow rate adjustment coefficient.

[0098] It should be noted that the coolant flow rate currently set for the external cooling system can usually be obtained from a control system or a monitoring system of the external cooling system, or in other ways, which are not specifically limited or elaborated.

[0099] In one implementation, the final coolant flow is obtained according to the coolant flow and coolant flow adjustment coefficient currently set in the external cooling system, and the temperature of the converter station valve is controlled according to the final coolant flow. This method can dynamically adjust the coolant flow according to the real-time status of the system and various influencing factors, such as temperature and humidity deviation, equipment aging, load fluctuation, etc., to ensure that the converter station valve always operates within the optimal temperature control range; secondly, flexible adjustment of the coolant flow can not only improve the response speed of the cooling system, but also avoid over-cooling or insufficient cooling, reduce energy waste and equipment loss; at the same time, reasonable temperature control management can extend the service life of the equipment, maintain efficient operation of the system, ensure the safety, stability and cooling effect of the converter station valve, thereby improving the reliability and stability of the entire power system.

[0100] Based on the same inventive concept, the embodiment of the present invention also provides a temperature control device for the external cooling system of a converter station valve. Figure 2 , Figure 2 A framework diagram of a temperature control device for a converter station valve external cooling system provided by an embodiment of the present invention, the device comprising:

[0101] Load fluctuation module: obtains the power of the converter station valve within a preset time period, and calculates the load fluctuation index of the converter station valve according to the power;

[0102] Judgment module: compares the load fluctuation index with a preset load fluctuation index threshold, and judges whether the load fluctuation of the converter station valve is a short-term fluctuation according to the comparison result;

[0103] : When the load fluctuation of the converter station valve is not a short-term fluctuation, the temperature and humidity of the environment where the converter station valve is located, the use time of the converter station valve, the temperature of the coolant of the external cooling system and the flow rate of the external cooling system pipeline are obtained, and the coolant flow adjustment coefficient is obtained in combination with the load fluctuation index;

[0104] Temperature control module: obtains the final coolant flow rate according to the coolant flow rate and coolant flow rate adjustment coefficient currently set in the external cooling system, and performs temperature control on the converter station valve according to the final coolant flow rate.

[0105] Based on a temperature control device for an external cooling system of a converter station valve provided in an embodiment of the present invention, through the above-mentioned method, during actual operation, it is possible to reasonably judge whether the load fluctuation of the converter station valve is a short-term fluctuation or a long-term change, and reasonably change the coolant flow of the external cooling system to perform temperature control according to the judgment result, thereby reducing excessive reaction caused by external cooling, thereby reducing energy waste and reducing equipment wear; in addition, when temperature control is performed by changing the coolant flow of the external cooling system, the coolant flow can be intelligently adjusted according to the actual state to control the temperature of the converter station valve, thereby ensuring a better cooling effect and reducing damage to the converter valve.

[0106] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be used to artificially limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A circulating heating temperature control for the external cooling system of a converter station, characterized in that: The following steps are involved: Obtaining the power of the converter station valve within a preset time period, and calculating the load fluctuation index of the converter station valve according to the power; Comparing the load fluctuation index with a preset load fluctuation index threshold, and judging whether the load fluctuation of the converter station valve is a short-term fluctuation according to the comparison result; When the load fluctuation of the converter station valve is not a short-term fluctuation, the temperature and humidity of the environment where the converter station valve is located, the use time of the converter station valve, the temperature of the coolant of the external cooling system and the flow rate of the external cooling system pipeline are obtained, and the coolant flow adjustment coefficient is obtained in combination with the load fluctuation index; The final coolant flow rate is obtained according to the coolant flow rate and the coolant flow rate adjustment coefficient currently set in the external cooling system, and the temperature of the converter station valve is controlled according to the final coolant flow rate.

2. A converter station valve external cooling system circulating heating temperature control according to claim 1, characterized in that: The load fluctuation index of the converter station valve calculated based on power includes: Acquire the power of the converter station valve based on the time sequence within a preset time period as a power sequence; The power sequence is decomposed into several levels by Daubechies wavelet, and the numerical sequence corresponding to the low-frequency components and the numerical sequence corresponding to the high-frequency components of each level are output; Calculate the sum of the numerical sequences corresponding to the low-frequency components at each level to obtain the low-frequency component energy at the corresponding level, and calculate the sum of the low-frequency component energies at all levels to obtain the total low-frequency component energy; Calculate the sum of the numerical sequences corresponding to the high-frequency components of each level to obtain the high-frequency component energy of the corresponding level, and calculate the sum of the high-frequency component energies of all levels to obtain the total high-frequency component energy; The sum of the total low-frequency component energy and the total high-frequency component energy is calculated as the total energy, and the total low-frequency component energy is divided by the total energy to obtain the load fluctuation index of the converter station valve.

3. The temperature control of the circulating heating of the external cooling system of the converter station valve according to claim 1 is characterized in that: Judging whether the load fluctuation of the converter station valve is a short-term fluctuation based on the comparison results includes: If the load fluctuation index is less than the preset load fluctuation index threshold, the load fluctuation of the converter station valve is a short-term fluctuation. At this time, there is no need to adjust the coolant flow of the external cooling system of the converter station valve, and the temperature of the converter station valve is still controlled according to the original coolant flow of the external cooling system; If the load fluctuation index is not less than the preset load fluctuation index threshold, the load fluctuation of the converter station valve is not a short-term fluctuation but a long-term change. In this case, it is necessary to adjust the coolant flow of the converter station valve external cooling system to cool the converter station valve.

4. The circulating heating temperature control of the external cooling system of a converter station valve according to claim 1 is characterized in that: The temperature and humidity of the environment where the converter station valve is located, the service life of the converter station valve, the temperature of the coolant in the external cooling system and the flow rate of the external cooling system pipeline are obtained, and the coolant flow adjustment coefficient is obtained in combination with the load fluctuation index, including: The temperature and humidity of the environment where the converter station valve is located within the preset time period are obtained, and the temperature and humidity deviation coefficient is calculated. The calculation formula is: Where DH represents the temperature and humidity deviation coefficient, T( t )、s( t ) respectively represent the temperature data and humidity data of the environment where the converter station valve is located within the preset time period, [ t 1, t 2] indicates the time period when the temperature data is greater than the preset maximum temperature corresponding to the coolant flow rate originally set for the external cooling system, [ t 3. t 4] represents the time period when the temperature data is greater than the preset maximum humidity corresponding to the coolant flow rate originally set for the external cooling system, and a and respectively represent the preset influence weights of the temperature data and the humidity data; The coolant flow regulation coefficient is obtained according to the temperature and humidity deviation coefficient, the use time of the converter station valve, the temperature of the coolant in the external cooling system, the flow rate of the external cooling system pipeline and the load fluctuation index.

5. A converter station valve external cooling system circulating heating temperature control according to claim 4, characterized in that: According to the temperature and humidity deviation coefficient, the use time of the converter station valve, the temperature of the coolant in the external cooling system, the flow rate of the external cooling system pipeline and the load fluctuation index, the coolant flow adjustment coefficient includes: Obtain the time when the converter station valve is put into use and the average usable time of the converter station valve, and divide the time when the valve is put into use by the average usable time to obtain the service life coefficient; Obtain the average maintenance time interval of the converter station valve and the time interval from the current time to the last maintenance, and subtract the time interval from the current time to the last maintenance from the average maintenance time interval to obtain the maintenance interval coefficient; Obtain the current temperature of the coolant in the external cooling system, and subtract the preset maximum temperature threshold from the current temperature of the coolant to obtain a coolant temperature deviation value; The coolant flow regulation coefficient is obtained according to the temperature and humidity deviation coefficient, service life coefficient, maintenance interval coefficient, coolant temperature deviation value, flow velocity of the external cooling system pipeline and load fluctuation index.

6. A converter station valve external cooling system circulating heating temperature control according to claim 5, characterized in that: The coolant flow adjustment coefficient is obtained based on the temperature and humidity deviation coefficient, service life coefficient, maintenance interval coefficient, coolant temperature deviation value, flow rate of the external cooling system pipeline and load fluctuation index, including: Obtain the flow rate of the external cooling system pipeline at each moment in a preset time period to obtain a flow rate sequence, and calculate the difference between the preset minimum flow rate and each flow rate in the flow rate sequence to obtain a flow rate difference sequence; calculate the mean of the flow rate difference sequence as the flow rate deviation value; The coolant flow adjustment coefficient is obtained according to the temperature and humidity deviation coefficient, service life coefficient, maintenance interval coefficient, coolant temperature deviation value, flow rate deviation value and load fluctuation index. The calculation formula is: Wherein, HJY is the coolant flow adjustment coefficient, DH, FG, KU, GT, FD, SE are respectively the temperature and humidity deviation coefficient, service life coefficient, maintenance interval coefficient, coolant temperature deviation value, flow rate deviation value and load fluctuation index, a1, a2, a3, a4, a5, a6 are respectively the preset proportional coefficients of DH, FG, KU, GT, FD, SE, and a1, a2, a3, a4, a5, a6 are all greater than 0.

7. The temperature control of circulating heating of the external cooling system of a converter station according to claim 1, characterized in that: The final coolant flow rate obtained based on the current coolant flow rate and coolant flow rate adjustment coefficient of the external cooling system includes: HGD=HK×(1+HJT) Where HGD is the final coolant flow rate, HK is the coolant flow rate currently set for the external cooling system, and HJY is the coolant flow rate adjustment coefficient.

8. A converter station valve external cooling system circulating heating temperature control device, used to implement the converter station valve external cooling system circulating heating temperature control as described in any one of claims 1 to 7, characterized in that: The device comprises: Load fluctuation module: obtains the power of the converter station valve within a preset time period, and calculates the load fluctuation index of the converter station valve according to the power; Judgment module: compares the load fluctuation index with a preset load fluctuation index threshold, and judges whether the load fluctuation of the converter station valve is a short-term fluctuation according to the comparison result; Flow regulation module: When the load fluctuation of the converter station valve is not a short-term fluctuation, the temperature and humidity of the environment where the converter station valve is located, the use time of the converter station valve, the temperature of the coolant in the external cooling system and the flow rate of the external cooling system pipeline are obtained, and the coolant flow regulation coefficient is obtained in combination with the load fluctuation index; Temperature control module: obtains the final coolant flow rate according to the coolant flow rate and coolant flow rate adjustment coefficient currently set in the external cooling system, and performs temperature control on the converter station valve according to the final coolant flow rate.

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