Water electrolysis hydrogen production system connected to the power grid test system

Abstract

The present invention belongs to the technical field of hydrogen production by electrolysis, and specifically relates to a test system for accessing a hydrogen production system by electrolysis to a power grid, including an operation risk assessment module, an additional detection and analysis module, and a comprehensive analysis and early warning module. The present invention conducts a test on the access of the hydrogen production system by electrolysis to the power grid, analyzes whether a fault occurs during the operation, and handles the fault in a timely manner. By comprehensively evaluating a number of key operating parameters of the hydrogen production system by electrolysis after the access to the power grid, a comprehensive fault warning and risk assessment solution is provided. The design of the system not only improves the accuracy and response speed of fault detection, but also avoids the problem of frequent false alarms by reducing the reliance on single parameter monitoring, thereby optimizing the integration and operation of the hydrogen production system by electrolysis in the power grid. After the test, the system can be optimized according to the results of the test, and can be continuously used after the hydrogen production system by electrolysis is connected to the power grid.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrogen production by electrolysis of water, and in particular relates to a test system for connecting a hydrogen production system by electrolysis of water to a power grid. Background Art

[0002] The water electrolysis hydrogen production system is a technical system that produces hydrogen by electrolyzing water. The basic principle of water electrolysis hydrogen production is to use electric current to decompose water into hydrogen and oxygen. Connecting the water electrolysis hydrogen production system to the power grid can provide electricity to the hydrogen production system through the power grid. This practice can not only effectively utilize the excess renewable energy in the power grid, but also enhance the stability and economic benefits of the power grid. In order to ensure the effectiveness and reliability of this system, the water electrolysis hydrogen production system must be rigorously tested to evaluate its performance and potential integration issues under actual power grid conditions.

[0003] In the prior art, the test of the water electrolysis hydrogen production system usually focuses on monitoring specific parameters in the system operation. Although this method can provide a certain degree of fault warning, it often has the problem of frequent warnings and cannot fully reflect the overall operating status of the system. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention proposes a grid-connected test system for a water electrolysis hydrogen production system, which improves the accuracy and response speed of fault detection during grid-connected test and avoids the problem of frequent false alarms by reducing reliance on single parameter monitoring, thereby optimizing the integration and operation of the water electrolysis hydrogen production system in the grid.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The test system for connecting the water electrolysis hydrogen production system to the power grid includes:

[0007] An operation risk assessment module is used to analyze and obtain the degree of hydrogen production anomaly and the density of abnormal voltage fluctuation in the past preset time period after the hydrogen production system by electrolysis is connected to the power grid, and to determine whether there is a risk in the operation process of the hydrogen production system by electrolysis being connected to the power grid in the past preset time period based on the obtained degree of hydrogen production anomaly and the density of abnormal voltage fluctuation;

[0008] An additional detection and analysis module is used to analyze and obtain the degree of influence of the power factor of the power grid connected to the water electrolysis hydrogen production system according to a first power factor data set of the power grid before the water electrolysis hydrogen production system is connected and a second power factor data set of the power grid after the water electrolysis hydrogen production system is connected, and to analyze and obtain the degree of influence of the total harmonic distortion rate of the power grid connected to the water electrolysis hydrogen production system according to a first total harmonic distortion rate data set of the power grid before the water electrolysis hydrogen production system is connected and a second total harmonic distortion rate data set of the power grid after the water electrolysis hydrogen production system is connected;

[0009] The comprehensive analysis and early warning module is used to conduct a comprehensive analysis of the abnormal degree of hydrogen production, the density of abnormal voltage fluctuations, the degree of power factor influence, and the degree of power quality influence when there are risks in the operation process of the electrolysis water hydrogen production system connected to the power grid within the preset time period in the past, and to issue an early warning for the operation failure of the electrolysis water hydrogen production system connected to the power grid.

[0010] Furthermore, the method for obtaining the abnormal degree of hydrogen production includes:

[0011] Get the hydrogen production and electricity consumption in the past preset time period, marked as and ; Based on the hydrogen production and power consumption in the past preset time period, calculate the hydrogen production power consumption rate of the water electrolysis hydrogen production system connected to the power grid in the past time period , the calculation formula is: ;

[0012] The calculated hydrogen production electricity consumption rate is compared with the preset hydrogen production electricity consumption rate threshold; if the calculated hydrogen production electricity consumption rate is greater than the preset hydrogen production electricity consumption rate threshold, a signal indicating a high degree of hydrogen production abnormality is generated; if the calculated hydrogen production electricity consumption rate is less than or equal to the preset hydrogen production electricity consumption rate threshold, a signal indicating a low degree of hydrogen production abnormality is generated.

[0013] Furthermore, the method for obtaining the abnormal voltage fluctuation density includes:

[0014] Obtain the voltage sequence value of the power grid in the past preset time period after the water electrolysis hydrogen production system is connected to the power grid; divide the past preset time period evenly into n monitoring time intervals, and calculate the voltage fluctuation value in each monitoring time interval , the calculation formula is: ; In the formula, i represents the number of the monitoring time interval, i=1,2…n, n is the number of time intervals; and Respectively represent the maximum voltage amplitude value and the minimum voltage amplitude value in the i-th monitoring time interval, Indicates the normal voltage amplitude value;

[0015] The normal amplitude value of voltage refers to the voltage level that the power supply or electrical equipment in the water electrolysis hydrogen production system should have under normal working conditions. This value is usually specified by the manufacturer of the equipment and given in the technical specifications or user manual of the equipment. It can also be set by yourself according to needs;

[0016] Counting the number k of monitoring time intervals in which the voltage fluctuation value does not meet the preset voltage fluctuation standard range in the past preset time period;

[0017] According to the calculation formula , obtain the abnormal voltage fluctuation density of the power grid in the past preset time period after the water electrolysis hydrogen production system is connected to the power grid; where T represents the time value (time interval) of the monitoring time interval; when calculating, the unit of the time interval can be determined according to the setting of the threshold, and dimensionless processing is performed, and the rest of the calculations are similar.

[0018] The calculated voltage abnormal fluctuation density is compared with the preset voltage abnormal fluctuation density threshold. If the calculated voltage abnormal fluctuation density is less than or equal to the preset voltage abnormal fluctuation density threshold, a signal with small voltage abnormal fluctuation density is generated; if the calculated voltage abnormal fluctuation density is greater than the preset voltage abnormal fluctuation density threshold, a signal with large voltage abnormal fluctuation density is generated.

[0019] Furthermore, the analysis based on the acquired hydrogen production abnormality degree and voltage abnormal fluctuation density determines whether there is a risk in the operation process of the water electrolysis hydrogen production system connected to the power grid within the past preset time period, including: as long as one of the signals of a high degree of hydrogen production abnormality or a large density of voltage abnormal fluctuations occurs, it is determined that there is a risk in the operation process of the water electrolysis hydrogen production system connected to the power grid within the past preset time period.

[0020] Furthermore, the various values ​​contained in the first power factor data set, the second power factor data set, the first total harmonic distortion rate data set and the second total harmonic distortion rate data set are arranged in the order of load number j; and j=1,2…m; m represents the total number of different loads connected to the power grid for detection.

[0021] Further, the analysis of obtaining the degree of influence of the access to the water electrolysis hydrogen production system on the power factor of the power grid according to the first power factor data set of the power grid before the access to the water electrolysis hydrogen production system and the second power factor data set of the power grid after the access to the water electrolysis hydrogen production system includes:

[0022] Label the values ​​in the first power factor data set as , label the values ​​in the second power factor data set as ;

[0023] The power factor fluctuation coefficient CPa before connecting to the water electrolysis hydrogen production system is calculated based on the first power factor data set, and the power factor fluctuation coefficient CPb after connecting to the water electrolysis hydrogen production system is calculated based on the second power factor data set. The calculation formulas are:

[0024] ;

[0025] ;

[0026] Based on the power factor fluctuation coefficient CPa before connecting to the water electrolysis hydrogen production system and the power factor fluctuation coefficient CPb after connecting to the water electrolysis hydrogen production system, the power factor influence degree RP before and after connecting to the water electrolysis hydrogen production system is calculated; ;

[0027] Conduct numerical analysis on the power factor impact RP before and after the water electrolysis hydrogen production system is connected to determine the extent of the negative impact of the water electrolysis hydrogen production system on the power factor of the power grid;

[0028] If RP≥1, it means that the negative impact of connecting to the water electrolysis hydrogen production system on the power factor of the power grid is small; if 0<RP<1, it means that the negative impact of connecting to the water electrolysis hydrogen production system on the power factor of the power grid is large.

[0029] Further, the method of analyzing and obtaining the influence degree value of the total harmonic distortion rate of the power grid connected to the water electrolysis hydrogen production system on the power grid according to the first total harmonic distortion rate data set of the power grid before the water electrolysis hydrogen production system is connected and the second total harmonic distortion rate data set of the power grid after the water electrolysis hydrogen production system is connected includes:

[0030] The values ​​in the first harmonic total distortion rate data set are marked as , mark the values ​​in the second harmonic total distortion rate data set as ;

[0031] The total harmonic distortion rate fluctuation coefficient CTa before connecting to the water electrolysis hydrogen production system is calculated based on the first total harmonic distortion rate data set, and the total harmonic distortion rate fluctuation coefficient CTb after connecting to the water electrolysis hydrogen production system is calculated based on the second total harmonic distortion rate data set. The calculation formulas are:

[0032] ;

[0033] ;

[0034] Based on the total harmonic distortion rate fluctuation coefficient CTa before connecting to the water electrolysis hydrogen production system and the total harmonic distortion rate fluctuation coefficient CTb after connecting to the water electrolysis hydrogen production system, the influence degree RT of the total harmonic distortion rate before and after connecting to the water electrolysis hydrogen production system is calculated; ;

[0035] The influence degree of total harmonic distortion rate RT before and after connecting to the water electrolysis hydrogen production system is numerically analyzed.

[0036] If RT≥1, it means that the negative impact of connecting to the water electrolysis hydrogen production system on the total harmonic distortion rate of the power grid is small; if 0<RT<1, it means that the negative impact of connecting to the water electrolysis hydrogen production system on the total harmonic distortion rate of the power grid is large.

[0037] Furthermore, the comprehensive analysis and early warning module specifically includes:

[0038] When there is a risk in the operation of the water electrolysis hydrogen production system connected to the power grid in the past preset time period, the hydrogen production power consumption rate ƞ and the voltage abnormal fluctuation density f of the water electrolysis hydrogen production system connected to the power grid in the past time period, the power factor influence degree RP and the total harmonic distortion rate influence degree RT before and after the water electrolysis hydrogen production system is connected are obtained; the obtained values ​​are normalized, and the hydrogen production power consumption rate after normalization is obtained. , voltage abnormal fluctuation density f, power factor influence degree RP and harmonic total distortion rate influence degree RT are assigned preset proportional coefficients respectively, and the operation fault index of the water electrolysis hydrogen production system connected to the power grid is calculated. The calculation formula is:

[0039] ;

[0040] Wherein, s1, s2, s3 and s4 are preset proportional coefficients of hydrogen production power consumption rate, voltage abnormal fluctuation density, power factor influence degree and total harmonic distortion rate influence degree respectively; and the values ​​of s1, s2, s3 and s4 are all greater than 0;

[0041] Compare the calculated operation fault index with the preset operation fault index warning value to analyze and determine whether it is necessary to issue a warning for the operation of the water electrolysis hydrogen production system connected to the power grid;

[0042] If the calculated operation fault index is greater than the preset operation fault index warning value, a warning signal for the operation fault of the hydrogen production system connected to the power grid is generated, and relevant technical personnel are notified to handle it in time;

[0043] If the calculated operation fault index is less than or equal to the preset operation fault index warning value, a signal indicating that the electrolysis water hydrogen production system is connected to the power grid and operating normally is generated, and no processing is required at this time.

[0044] The beneficial effects of the present invention are:

[0045] The present invention conducts a test on the access of the electrolytic water hydrogen production system to the power grid, analyzes whether a fault occurs during the operation, and handles the fault in a timely manner. By comprehensively evaluating a number of key operating parameters of the electrolytic water hydrogen production system after the access to the power grid, a comprehensive fault warning and risk assessment solution is provided. The design of the system not only improves the accuracy and response speed of fault detection, but also avoids the problem of frequent false alarms by reducing the reliance on single parameter monitoring, thereby optimizing the integration and operation of the electrolytic water hydrogen production system in the power grid. In addition, the system can timely warn of potential operational risks, provide a basis for technical personnel to take preventive measures, and significantly improve the stability and reliability of the system. After the test, the system can be optimized according to the results of the test, and it can be continuously used after the electrolytic water hydrogen production system is connected to the power grid.

[0046] The present invention can also comprehensively monitor and analyze the power quality of the power grid. By evaluating the impact of the water electrolysis hydrogen production system on the power factor and total harmonic distortion rate of the power grid, the negative impact that the power grid may suffer can be scientifically quantified and warned, thereby supporting power grid operators to make more reasonable scheduling and management decisions. This method not only improves the safety and flexibility of the water electrolysis hydrogen production system, but also helps to reduce operating costs and improve the overall performance and economic benefits of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic diagram of the system structure of the present invention. DETAILED DESCRIPTION

[0048] The technical solution of the present invention will be clearly and completely described below in conjunction with embodiments.

[0049] like Figure 1 As shown, the test system for connecting the water electrolysis hydrogen production system to the power grid includes: an operation risk assessment module, an additional detection and analysis module, and a comprehensive analysis and early warning module;

[0050] The operation risk assessment module is used to analyze and obtain the abnormal degree of hydrogen production and the abnormal voltage fluctuation density in the past preset time period after the electrolysis water hydrogen production system is connected to the power grid, and to determine whether there is a risk in the operation process of the electrolysis water hydrogen production system connected to the power grid in the past preset time period based on the obtained abnormal degree of hydrogen production and abnormal voltage fluctuation density;

[0051] The additional detection and analysis module is used to analyze and obtain the degree of influence of the power factor of the power grid connected to the water electrolysis hydrogen production system according to the first power factor data set of the power grid before the water electrolysis hydrogen production system is connected and the second power factor data set of the power grid after the water electrolysis hydrogen production system is connected, and to analyze and obtain the degree of influence of the total harmonic distortion rate of the power grid connected to the water electrolysis hydrogen production system according to the first total harmonic distortion rate data set of the power grid before the water electrolysis hydrogen production system is connected and the second total harmonic distortion rate data set of the power grid after the water electrolysis hydrogen production system is connected;

[0052] The comprehensive analysis and early warning module is used to conduct a comprehensive analysis of the abnormal degree of hydrogen production, the density of abnormal voltage fluctuations, the degree of power factor influence and the degree of power quality influence when there are risks in the operation process of the electrolysis water hydrogen production system connected to the power grid within the preset time period in the past, and to issue an early warning for the operation failure of the electrolysis water hydrogen production system connected to the power grid.

[0053] The electrolysis of water to produce hydrogen system is a technical system that produces hydrogen by electrolyzing water. The basic principle of electrolysis of water to produce hydrogen is to use electric current to decompose water into hydrogen and oxygen. As a clean energy, hydrogen can be used in fuel cells, electric vehicles or other energy applications. Hydrogen can also be used in chemical industry, metal processing and ammonia synthesis. Electrolysis of water to produce hydrogen is an environmentally friendly hydrogen production method that does not produce harmful by-products. Connecting the electrolysis of water to produce hydrogen system to the power grid can provide electricity to the hydrogen production system through the power grid. This approach can not only effectively utilize the excess renewable energy in the power grid, but also enhance the stability and economic benefits of the power grid. At the same time, this integration method supports the development of the hydrogen economy and helps protect the environment. The present invention conducts experimental tests on the measure of connecting the electrolysis of water to the power grid, analyzes whether a fault occurs during this operation, and handles the fault in a timely manner.

[0054] The abnormal degree of hydrogen production can be obtained by:

[0055] Get the hydrogen production and electricity consumption in the past preset time period, marked as and ;

[0056] Based on the hydrogen production and power consumption in the past preset time period, the power consumption rate of hydrogen production by water electrolysis system connected to the power grid in the past time period is calculated. , the calculation formula is: ;

[0057] The hydrogen production electricity consumption rate reflects the electricity required to produce unit mass of hydrogen. If the hydrogen production electricity consumption rate is greater than the corresponding threshold, it means that the hydrogen production efficiency in the past preset time period is low or abnormal.

[0058] Compare the calculated hydrogen production power consumption rate with the preset hydrogen production power consumption rate threshold; the preset hydrogen production power consumption rate threshold is obtained by relevant technical personnel based on a large amount of hydrogen production power consumption rate data and actual hydrogen production effect analysis, and is generally taken as 60kWh / kg;

[0059] If the calculated hydrogen production power consumption rate is greater than a preset hydrogen production power consumption rate threshold, a signal indicating a high degree of hydrogen production abnormality is generated;

[0060] If the calculated hydrogen production power consumption rate is less than or equal to a preset hydrogen production power consumption rate threshold, a signal indicating a low degree of hydrogen production abnormality is generated.

[0061] The methods for obtaining abnormal voltage fluctuation density include:

[0062] Obtain the voltage sequence value of the power grid in the past preset time period after the water electrolysis hydrogen production system is connected to the power grid; divide the past preset time period evenly into n monitoring time intervals, and calculate the voltage fluctuation value in each monitoring time interval , the calculation formula is: ; In the formula, i represents the number of the monitoring time interval, i=1,2…n, n is the number of time intervals; and They represent the maximum voltage amplitude value and the minimum voltage amplitude value in the i-th monitoring time interval respectively, Indicates the normal voltage amplitude value;

[0063] Dividing the past preset time period into multiple monitoring time intervals to calculate the voltage fluctuation value can more accurately capture subtle changes in voltage fluctuations and help identify instantaneous fluctuations that may be ignored over a larger time period.

[0064] Count the number of monitoring time intervals k in which the voltage fluctuation value does not meet the preset voltage fluctuation standard range in the past preset time period; wherein the preset voltage fluctuation standard range may be (-0.1, 0.1), and the actual range value is set by relevant technical personnel;

[0065] According to the calculation formula , obtain the abnormal voltage fluctuation density of the power grid in the past preset time period after the water electrolysis hydrogen production system is connected to the power grid; where T represents the time value of the monitoring time interval;

[0066] The larger the f value is, the more unstable the grid voltage is during the past preset time period, and there is a risk of grid instability.

[0067] The calculated voltage abnormal fluctuation density is compared with the preset voltage abnormal fluctuation density threshold to determine whether there is an unstable risk in the operation of the power grid after the water electrolysis hydrogen production system is connected in the past preset time period; the preset voltage abnormal fluctuation density threshold is set according to the enterprise production or industry standards; in this embodiment, the preset voltage abnormal fluctuation density threshold can be 0.01 / h;

[0068] If the calculated voltage abnormal fluctuation density is less than or equal to the preset voltage abnormal fluctuation density threshold, a signal with a small voltage abnormal fluctuation density is generated, indicating that the grid voltage has been stable in the past preset time period;

[0069] If the calculated voltage abnormal fluctuation density is greater than a preset voltage abnormal fluctuation density threshold, a signal of a large voltage abnormal fluctuation density is generated, indicating that the grid voltage has been unstable in the past preset time period.

[0070] Based on the obtained abnormal degree of hydrogen production and abnormal voltage fluctuation density, it is determined whether there are risks in the operation of the water electrolysis hydrogen production system connected to the power grid in the past preset time period, including:

[0071] As long as one of the signals of high abnormality of hydrogen production or high density of abnormal voltage fluctuation appears, it is determined that there is a risk in the operation of the water electrolysis hydrogen production system connected to the power grid in the past preset time period; it is necessary to further analyze the power factor and total harmonic distortion rate of the power grid to determine whether the water electrolysis hydrogen production system has an impact on the power grid after being connected to the power grid, so as to determine whether there is an abnormality in the water electrolysis hydrogen production system, and then carry out early warning processing;

[0072] By analyzing the abnormal degree of hydrogen production and the abnormal voltage fluctuation density during the operation of the water electrolysis hydrogen production system after it is connected to the power grid, it is evaluated whether there are risks in the operation process; if any indicator shows an abnormality, it indicates that there are risks in the operation process of the water electrolysis hydrogen production system connected to the power grid; this detection and analysis method is simple and efficient, reduces the need for multiple detection parameters, and has high sensitivity; when the abnormal degree of hydrogen production or the abnormal voltage fluctuation density exceeds the normal range, the power factor and total harmonic distortion rate of the power grid are further analyzed to determine whether there is a fault and to deal with it in time; this method significantly simplifies the abnormal detection procedure after the water electrolysis hydrogen production system is connected to the power grid, and improves the efficiency of system operation monitoring.

[0073] The additional detection and analysis module is used to analyze and obtain the degree of influence of the power factor of the power grid connected to the water electrolysis hydrogen production system based on the first power factor data set of the power grid before connecting to the water electrolysis hydrogen production system and the second power factor data set of the power grid after connecting to the water electrolysis hydrogen production system, and to analyze and obtain the degree of influence of the total harmonic distortion rate of the power grid connected to the water electrolysis hydrogen production system based on the first total harmonic distortion rate data set of the power grid before connecting to the water electrolysis hydrogen production system and the second total harmonic distortion rate data set of the power grid after connecting to the water electrolysis hydrogen production system.

[0074] Before the hydrogen production system by water electrolysis is connected to the power grid, different loads are respectively connected to the power grid, and power factor data and total harmonic distortion rate data under different loads are detected and obtained, and the power factor data detected and obtained based on different loads before the hydrogen production system by water electrolysis is connected to the power grid are marked as a first power factor data set, and the power factor data detected and obtained based on different loads after the hydrogen production system by water electrolysis is connected to the power grid are marked as a second power factor data set, and the total harmonic distortion rate data detected and obtained based on different loads before the hydrogen production system by water electrolysis is connected to the power grid are marked as a first total harmonic distortion rate data set, and the total harmonic distortion rate data detected and obtained based on different loads after the hydrogen production system by water electrolysis is connected to the power grid are marked as a second total harmonic distortion rate data set;

[0075] The values ​​included in the first power factor data set, the second power factor data set, the first total harmonic distortion rate data set, and the second total harmonic distortion rate data set are arranged in the order of load number j; and j=1,2…m; m represents the total number of different loads detected by the access power grid; the types of loads include linear loads and nonlinear loads. In this embodiment, several different loads can be selected from the linear load type, and several different loads can be selected from the nonlinear load type;

[0076] When detecting the power factor or total harmonic distortion rate, it is best to keep the same time for the same type of load to be connected to the grid before and after the water electrolysis hydrogen production system is connected to the grid to prevent the difference in duration from affecting the subsequent warning analysis results;

[0077] The first power factor data set and the first total harmonic distortion rate data set can be obtained before the water electrolysis hydrogen production system is connected to the power grid and stored in the database as historical data. When the operation risk assessment module analyzes that there are risks in the operation process of the water electrolysis hydrogen production system connected to the power grid within the past preset time period, the first power factor data set and the first total harmonic distortion rate data set can be extracted from the database, and the different loads contained in the first power factor data set and the first total harmonic distortion rate data set are connected to the load again with the same connection time, and the second power factor data set and the second total harmonic distortion rate data set are detected and obtained.

[0078] The influence of the access to the water electrolysis hydrogen production system on the power factor of the power grid is analyzed and obtained according to the first power factor data set of the power grid before the access to the water electrolysis hydrogen production system and the second power factor data set of the power grid after the access to the water electrolysis hydrogen production system, including:

[0079] Label the values ​​in the first power factor data set as , label the values ​​in the second power factor data set as ;

[0080] The power factor fluctuation coefficient CPa before connecting to the water electrolysis hydrogen production system is calculated based on the first power factor data set, and the power factor fluctuation coefficient CPb after connecting to the water electrolysis hydrogen production system is calculated based on the second power factor data set. The calculation formulas are:

[0081] ;

[0082] ;

[0083] The fluctuation coefficient value provides the relative fluctuation degree of the data. A higher fluctuation coefficient value means that the data fluctuates more. In the present embodiment, a high fluctuation coefficient indicates that the power factor varies more under different load conditions, which means the instability of the power system. High fluctuations may affect the performance of power equipment. Large fluctuations in the power factor may cause power quality problems, such as voltage drops, increased power losses, etc. A lower fluctuation coefficient value indicates that the power factor fluctuates less, and the corresponding problems will be alleviated.

[0084] Based on the power factor fluctuation coefficient CPa before connecting to the water electrolysis hydrogen production system and the power factor fluctuation coefficient CPb after connecting to the water electrolysis hydrogen production system, the power factor influence degree RP before and after connecting to the water electrolysis hydrogen production system is calculated; ;

[0085] Conduct numerical analysis on the power factor impact RP before and after the water electrolysis hydrogen production system is connected to determine the extent of the negative impact of the water electrolysis hydrogen production system on the power factor of the power grid;

[0086] If RP≥1, it means that the negative impact of connecting to the water electrolysis hydrogen production system on the power factor of the power grid is small; if 0<RP<1, it means that the negative impact of connecting to the water electrolysis hydrogen production system on the power factor of the power grid is large.

[0087] According to the first harmonic total distortion rate data set of the power grid before the access to the water electrolysis hydrogen production system and the second harmonic total distortion rate data set of the power grid after the access to the water electrolysis hydrogen production system, the influence degree value of the total harmonic distortion rate of the power grid accessed by the water electrolysis hydrogen production system is obtained, including:

[0088] The values ​​in the first harmonic total distortion rate data set are marked as , mark the values ​​in the second harmonic total distortion rate data set as ;

[0089] The total harmonic distortion rate fluctuation coefficient CTa before connecting to the water electrolysis hydrogen production system is calculated based on the first total harmonic distortion rate data set, and the total harmonic distortion rate fluctuation coefficient CTb after connecting to the water electrolysis hydrogen production system is calculated based on the second total harmonic distortion rate data set. The calculation formulas are:

[0090] ;

[0091] ;

[0092] The larger the total harmonic distortion rate fluctuation coefficient, the poorer the stability of the harmonic distortion, which may indicate that there is an unstable harmonic source, grid quality problems, load fluctuations or system design problems in the power grid. Monitoring and analyzing the harmonic fluctuation coefficient helps to identify and solve harmonic problems in the power system, thereby improving the stability of the power grid and the power quality.

[0093] Based on the total harmonic distortion rate fluctuation coefficient CTa before connecting to the water electrolysis hydrogen production system and the total harmonic distortion rate fluctuation coefficient CTb after connecting to the water electrolysis hydrogen production system, the influence degree RT of the total harmonic distortion rate before and after connecting to the water electrolysis hydrogen production system is calculated; ;

[0094] Conduct numerical analysis on the influence of total harmonic distortion rate before and after the water electrolysis hydrogen production system is connected, and determine the negative impact of the water electrolysis hydrogen production system on the total harmonic distortion rate of the power grid;

[0095] If RT≥1, it means that the negative impact of connecting to the water electrolysis hydrogen production system on the total harmonic distortion rate of the power grid is small; if 0<RT<1, it means that the negative impact of connecting to the water electrolysis hydrogen production system on the total harmonic distortion rate of the power grid is large.

[0096] When there is a risk in the operation of the water electrolysis hydrogen production system connected to the power grid in the past preset time period, the hydrogen production power consumption rate of the water electrolysis hydrogen production system connected to the power grid in the past time period is obtained. The voltage abnormal fluctuation density f, the power factor influence degree RP and the total harmonic distortion rate influence degree RT before and after the water electrolysis hydrogen production system is connected; the obtained values ​​are normalized, and the hydrogen production power consumption rate after normalization is , voltage abnormal fluctuation density f, power factor influence degree RP and harmonic total distortion rate influence degree RT are assigned preset proportional coefficients respectively, and the operation fault index of the water electrolysis hydrogen production system connected to the power grid is calculated. The calculation formula is:

[0097] ;

[0098] Wherein, s1, s2, s3 and s4 are respectively the preset proportional coefficients of the hydrogen production power consumption rate, abnormal voltage fluctuation density, power factor influence degree and total harmonic distortion rate influence degree; and the values ​​of s1, s2, s3 and s4 are all greater than 0; among them, the values ​​of s1, s2, s3 and s4 are set according to the influence degree of the corresponding indicators on the access of the water electrolysis hydrogen production system to the power grid.

[0099] The calculated operation fault index is compared with the preset operation fault index warning value to analyze and determine whether it is necessary to issue a warning for the operation of the water electrolysis hydrogen production system connected to the power grid; among which, the preset operation fault index warning value is obtained by relevant technical personnel based on a large number of operation fault index values ​​calculated and detected when the water electrolysis hydrogen production system is connected to the power grid and analyzed with the hydrogen production industry standards and the power grid power system maintenance industry standards.

[0100] If the calculated operation fault index is greater than the preset operation fault index warning value, a warning signal for the operation fault of the water electrolysis hydrogen production system connected to the power grid is generated, and relevant technical personnel are notified to handle it in time;

[0101] If the calculated operation fault index is less than or equal to the preset operation fault index warning value, a signal indicating that the electrolysis water hydrogen production system is connected to the power grid and operating normally is generated, and no processing is required at this time.

[0102] In the present invention, when it is analyzed that there are risks in the operation process of the water electrolysis hydrogen production system connected to the power grid within the preset time period in the past, the influence degree of the power factor of the water electrolysis hydrogen production system on the power grid is obtained according to the first power factor data set of the power grid before the water electrolysis hydrogen production system is connected and the second power factor data set of the power grid after the water electrolysis hydrogen production system is connected, and the influence degree value of the total harmonic distortion rate of the water electrolysis hydrogen production system on the power grid is obtained according to the first total harmonic distortion rate data set of the power grid before the water electrolysis hydrogen production system is connected and the second total harmonic distortion rate data set of the power grid after the water electrolysis hydrogen production system is connected. Then, a comprehensive analysis is performed in combination with the abnormal degree of hydrogen production, the abnormal voltage fluctuation density, the power factor influence degree and the power quality influence degree value, and an early warning is given for the operation failure of the water electrolysis hydrogen production system connected to the power grid, so as to provide a comprehensive fault early warning and risk assessment for the operation of the water electrolysis hydrogen production system after the connection to the power grid;

[0103] This method not only improves the accuracy and efficiency of fault detection, but also optimizes the operation and management of the power system, supports scientific decision-making, has significant safety, flexibility and cost-effectiveness, and solves the problems of frequent warnings of a single parameter and the inability of a single parameter to accurately reflect the overall operating status of the water electrolysis hydrogen production system connected to the power grid.

[0104] The above formulas are all calculated by removing dimensions and taking numerical values. The formula is a formula that is closest to the actual situation obtained by collecting a large amount of data and performing software simulation. The preset parameters and preset thresholds in the formula are set by technical personnel in this field according to actual conditions or obtained by simulating a large amount of data.

Claims

1. The test system for connecting the water electrolysis hydrogen production system to the power grid is characterized by: include: An operation risk assessment module is used to analyze and obtain the degree of hydrogen production anomaly and the density of abnormal voltage fluctuation in the past preset time period after the hydrogen production system by electrolysis is connected to the power grid, and to determine whether there is a risk in the operation process of the hydrogen production system by electrolysis being connected to the power grid in the past preset time period based on the obtained degree of hydrogen production anomaly and the density of abnormal voltage fluctuation; An additional detection and analysis module is used to analyze and obtain the degree of influence of the power factor of the power grid connected to the water electrolysis hydrogen production system according to a first power factor data set of the power grid before the water electrolysis hydrogen production system is connected and a second power factor data set of the power grid after the water electrolysis hydrogen production system is connected, and to analyze and obtain the degree of influence of the total harmonic distortion rate of the power grid connected to the water electrolysis hydrogen production system according to a first total harmonic distortion rate data set of the power grid before the water electrolysis hydrogen production system is connected and a second total harmonic distortion rate data set of the power grid after the water electrolysis hydrogen production system is connected; The comprehensive analysis and early warning module is used to conduct a comprehensive analysis of the abnormal degree of hydrogen production, the density of abnormal voltage fluctuations, the degree of power factor influence, and the degree of power quality influence when there are risks in the operation process of the electrolysis water hydrogen production system connected to the power grid within the preset time period in the past, and to issue an early warning for the operation failure of the electrolysis water hydrogen production system connected to the power grid.

2. The grid-connected test system for hydrogen production by electrolysis of water according to claim 1 is characterized in that: The method for obtaining the abnormal degree of hydrogen production includes: Get the hydrogen production and electricity consumption in the past preset time period, marked as and ; Based on the hydrogen production and power consumption in the past preset time period, calculate the hydrogen production power consumption rate of the water electrolysis hydrogen production system connected to the power grid in the past time period , the calculation formula is: ; The calculated hydrogen production electricity consumption rate is compared with the preset hydrogen production electricity consumption rate threshold; if the calculated hydrogen production electricity consumption rate is greater than the preset hydrogen production electricity consumption rate threshold, a signal indicating a high degree of hydrogen production abnormality is generated; if the calculated hydrogen production electricity consumption rate is less than or equal to the preset hydrogen production electricity consumption rate threshold, a signal indicating a low degree of hydrogen production abnormality is generated.

3. The grid-connected test system for hydrogen production by electrolysis of water according to claim 2 is characterized in that: The method for obtaining the abnormal voltage fluctuation density includes: Obtain the voltage sequence value of the power grid in the past preset time period after the water electrolysis hydrogen production system is connected to the power grid; divide the past preset time period evenly into n monitoring time intervals, and calculate the voltage fluctuation value in each monitoring time interval , the calculation formula is: ; In the formula, i represents the number of the monitoring time interval, i=1,2…n, n is the number of time intervals; and They represent the maximum voltage amplitude value and the minimum voltage amplitude value in the i-th monitoring time interval respectively, Indicates the normal voltage amplitude value; Counting the number k of monitoring time intervals in which the voltage fluctuation value does not meet the preset voltage fluctuation standard range in the past preset time period; According to the calculation formula , obtain the abnormal voltage fluctuation density of the power grid in the past preset time period after the water electrolysis hydrogen production system is connected to the power grid; where T represents the time value of the monitoring time interval; The calculated voltage abnormal fluctuation density is compared with the preset voltage abnormal fluctuation density threshold. If the calculated voltage abnormal fluctuation density is less than or equal to the preset voltage abnormal fluctuation density threshold, a signal with small voltage abnormal fluctuation density is generated; if the calculated voltage abnormal fluctuation density is greater than the preset voltage abnormal fluctuation density threshold, a signal with large voltage abnormal fluctuation density is generated.

4. The grid-connected test system for hydrogen production by electrolysis of water according to claim 3 is characterized by: The method of determining whether there is a risk in the operation process of the water electrolysis hydrogen production system connected to the power grid within the past preset time period based on the acquired hydrogen production abnormality degree and voltage abnormal fluctuation density analysis includes: as long as one of the signals of a high hydrogen production abnormality degree or a high voltage abnormal fluctuation density appears, it is determined that there is a risk in the operation process of the water electrolysis hydrogen production system connected to the power grid within the past preset time period.

5. The grid-connected test system for hydrogen production by electrolysis of water according to claim 4 is characterized by: The values ​​included in the first power factor data set, the second power factor data set, the first total harmonic distortion rate data set, and the second total harmonic distortion rate data set are arranged in the order of load number j; And j=1,2…m; m represents the total number of different loads connected to the power grid for detection.

6. The grid-connected test system for hydrogen production by electrolysis of water according to claim 5 is characterized by: The step of analyzing and obtaining the influence of the access to the water electrolysis hydrogen production system on the power factor of the power grid according to a first power factor data set of the power grid before the access to the water electrolysis hydrogen production system and a second power factor data set of the power grid after the access to the water electrolysis hydrogen production system comprises: Label the values ​​in the first power factor data set as , label the values ​​in the second power factor data set as ; The power factor fluctuation coefficient CPa before connecting to the water electrolysis hydrogen production system is calculated based on the first power factor data set, and the power factor fluctuation coefficient CPb after connecting to the water electrolysis hydrogen production system is calculated based on the second power factor data set. The calculation formulas are: ； ； Based on the power factor fluctuation coefficient CPa before connecting to the water electrolysis hydrogen production system and the power factor fluctuation coefficient CPb after connecting to the water electrolysis hydrogen production system, the power factor influence degree RP before and after connecting to the water electrolysis hydrogen production system is calculated; ; Conduct numerical analysis on the power factor impact RP before and after the water electrolysis hydrogen production system is connected to determine the extent of the negative impact of the water electrolysis hydrogen production system on the power factor of the power grid; If RP≥1, it means that the negative impact of connecting to the water electrolysis hydrogen production system on the power factor of the power grid is small; if 0<RP<1, it means that the negative impact of connecting to the water electrolysis hydrogen production system on the power factor of the power grid is large.

7. The grid-connected test system for hydrogen production by electrolysis of water according to claim 6 is characterized by: The method of analyzing and obtaining the influence degree value of the total harmonic distortion rate of the power grid connected to the water electrolysis hydrogen production system on the total harmonic distortion rate of the power grid according to the first total harmonic distortion rate data set of the power grid before the power grid is connected to the water electrolysis hydrogen production system and the second total harmonic distortion rate data set of the power grid after the power grid is connected to the water electrolysis hydrogen production system includes: The values ​​in the first harmonic total distortion rate data set are marked as , mark the values ​​in the second harmonic total distortion rate data set as ; The total harmonic distortion rate fluctuation coefficient CTa before connecting to the water electrolysis hydrogen production system is calculated based on the first total harmonic distortion rate data set, and the total harmonic distortion rate fluctuation coefficient CTb after connecting to the water electrolysis hydrogen production system is calculated based on the second total harmonic distortion rate data set. The calculation formulas are: ； ； Based on the total harmonic distortion rate fluctuation coefficient CTa before connecting to the water electrolysis hydrogen production system and the total harmonic distortion rate fluctuation coefficient CTb after connecting to the water electrolysis hydrogen production system, the influence degree RT of the total harmonic distortion rate before and after connecting to the water electrolysis hydrogen production system is calculated; ; The influence degree of total harmonic distortion rate RT before and after connecting to the water electrolysis hydrogen production system is numerically analyzed. If RT≥1, it means that the negative impact of connecting to the water electrolysis hydrogen production system on the total harmonic distortion rate of the power grid is small; if 0<RT<1, it means that the negative impact of connecting to the water electrolysis hydrogen production system on the total harmonic distortion rate of the power grid is large.

8. The grid-connected test system for hydrogen production by electrolysis of water according to claim 7 is characterized by: The comprehensive analysis and early warning module specifically includes: When there is a risk in the operation of the water electrolysis hydrogen production system connected to the power grid in the past preset time period, the hydrogen production power consumption rate of the water electrolysis hydrogen production system connected to the power grid in the past time period is obtained. The voltage abnormal fluctuation density f, the power factor influence degree RP and the total harmonic distortion rate influence degree RT before and after the water electrolysis hydrogen production system is connected; the obtained values ​​are normalized, and the hydrogen production power consumption rate after normalization is , voltage abnormal fluctuation density f, power factor influence degree RP and harmonic total distortion rate influence degree RT are assigned preset proportional coefficients respectively, and the operation fault index of the water electrolysis hydrogen production system connected to the power grid is calculated. The calculation formula is: ； Wherein, s1, s2, s3 and s4 are preset proportional coefficients of hydrogen production power consumption rate, voltage abnormal fluctuation density, power factor influence degree and total harmonic distortion rate influence degree respectively; and the values ​​of s1, s2, s3 and s4 are all greater than 0; Compare the calculated operation fault index with the preset operation fault index warning value to analyze and determine whether it is necessary to issue a warning for the operation of the water electrolysis hydrogen production system connected to the power grid; If the calculated operation fault index is greater than the preset operation fault index warning value, a warning signal for the operation fault of the hydrogen production system connected to the power grid is generated, and relevant technical personnel are notified to handle it in time; If the calculated operation fault index is less than or equal to the preset operation fault index warning value, a signal indicating that the electrolysis water hydrogen production system is connected to the power grid and operating normally is generated, and no processing is required at this time.

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