CN111737875B - Active power unbalance rate analysis and diagnosis method, system and computer equipment - Google Patents

Abstract

The application discloses an active power unbalance analysis and diagnosis method, a system and computer equipment, wherein the method comprises the following steps: s10: establishing a primary equipment element model, and configuring element model parameters according to voltage levels; s20: importing and identifying measurement and control device information in the SCD file; s30: matching the measurement and control device information with a primary equipment element model to generate a primary main wiring system; s40: sampling data information of the measurement and control device is extracted, and a corresponding primary equipment element model in a primary main wiring system is displayed to form active power flow information; s50: calculating the total active power unbalance rate of the total station; s60: dividing voltage class areas to calculate active power unbalance rate; s70: and (5) carrying out regional diagnosis analysis on the grade voltage. According to the application, through carrying out voltage class area calculation and analysis and diagnosis on the active power, the analysis and diagnosis range is reduced, the active power unbalance reason is rapidly found out, and the intelligent transformer station is prevented from operating in an unbalance alarm state for a long time.

Description

Active power imbalance rate analysis and diagnosis method, system and computer equipment

Technical field

The invention relates to the technical field of power system protection and debugging, and in particular to an active power imbalance rate analysis and diagnosis method, system and computer equipment.

Background technique

With the rapid development of smart grids, the construction scale of smart substations has continued to expand. However, in recent years, smart substations have often experienced a long-term high unbalanced rate of active power in the substations. When substations are dispatched and assessed, they also have a great impact on the safe and stable operation of the power grid. Threat, and the active power imbalance rate of smart substations meeting the dispatching and operation requirements is a prerequisite for the safe and stable operation of smart substations and large power grids. At the same time, when the active power imbalance rate is large in smart substations, the cause cannot be quickly found out and cannot be solved. , causing the smart substation to run in an unbalanced alarm state for a long time.

Contents of the invention

In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that when the active power imbalance rate in the existing smart substation is too large, the cause cannot be quickly found, causing the smart substation to run in an imbalance alarm state for a long time. Therefore, an active power imbalance rate analysis and diagnosis method, system and computer equipment are provided.

The present invention is realized through the following technical solutions:

S10: Establish a smart substation primary equipment component model, and configure the component model parameters according to the voltage level;

S20: Import the SCD file of the smart substation, and identify the measurement and control device information in the SCD file;

S30: Match the measurement and control device information with the primary equipment component model to generate a primary main wiring system;

S40: Extract the sampling data information of the measurement and control device, and display the corresponding primary equipment component model in the primary main wiring system to form active power flow information;

S50: Calculation of the total active power imbalance rate of the entire station: Calculate the total active power imbalance rate of the smart substation based on the active power flow information and the sampling data information;

S60: Calculation of active power imbalance rate in voltage level regions: If the total active power imbalance rate exceeds the threshold range, divide the regions according to the voltage level to calculate the active power imbalance rate in each region;

S70: Voltage level area diagnostic analysis: perform imbalance diagnosis analysis on the voltage level area where the calculated active power imbalance rate is not equal to 0 and obtain a diagnosis result.

Optionally, the primary equipment of the smart substation includes busbars, lines, bus ties, transformers, CT transformers, PT transformers and circuit breakers.

Further, the step S10 includes configuring parameters of the component model according to four voltage levels of 220kv, 110kv, 35kv and 10kv, specifically including:

Configure CT transformers and PT transformers with variable ratio;

Configure parameters for the line length, inductive reactance, impedance, capacitive reactance and compensation coefficient;

Configure parameters for main transformer impedance, transformer ratio characteristics, load loss, and no-load loss.

Optionally, the sampling data information includes voltage sampling information, current sampling information, active power information, power factor information, circuit breaker position information and knife switch position information.

Optionally, the measurement and control device information includes line measurement and control device information, busbar measurement and control device information, transformer measurement and control device information and bus tie measurement and control device information.

Further, step S30 specifically includes the following steps:

S31: Match the line measurement and control device information of 220kv, 110kv, 35kv and 10kv with the line element model of the corresponding voltage level;

S32: Match the bus measurement and control device information of 220kv, 110kv, 35kv and 10kv with the bus component model of the corresponding voltage level;

S33: Match the transformer measurement and control device information of 220kv, 110kv, 35kv and 10kv with the transformer component model of the corresponding voltage level;

S34: Match the bus link measurement and control device information of 220kv, 110kv, 35kv and 10kv with the bus link component model of the corresponding voltage level;

S35: After all the measurement and control device information is matched to the primary equipment component model, a primary main wiring system is generated.

Optionally, the step S70 specifically includes:

Comparing the regional line, main transformer side, bus voltage and current information of 220kv, 110kv, 35kv and 10kv with the bus voltage information of the corresponding voltage levels, it is concluded that the active power imbalance factors are abnormal voltage acquisition and three-phase current imbalance. , CT current transformer accuracy or CT current transformer failure, PT transformer accuracy or PT transformer failure;

Combined with the configuration of the transformer load loss rate, the current, voltage, active power and reactive power information of the 220kv, 110kv, 35kv and 10kv sides of the transformer were analyzed, and it was concluded that the active power imbalance factor was the abnormal load loss of the transformer.

By analyzing the current, voltage, active power and reactive power information of the 220kv, 110kv, 35kv and 10kv sides of the transformer based on the impedance and ratio characteristics of the configured transformer, it is concluded that the active power imbalance factors are abnormal voltage of the transformer system and abnormal outlet voltage.

An active power imbalance analysis and diagnosis system, including:

The model building module is used to establish primary equipment component models for primary equipment in smart substations;

Parameter configuration module, used to configure parameters for the primary equipment component model;

Import the identification module, used to import the SCD file of the smart substation and identify the measurement and control device information in the SCD file;

Matching generation module, used to match the measurement and control device information with the primary equipment component model and generate a primary main wiring system

An extraction and formation module, used to extract the sampling data information of the measurement and control device and display and form the active power flow information on the corresponding primary equipment component model in the primary main wiring system;

A calculation module used to calculate the total active power imbalance rate of the smart substation and calculate the active power imbalance rate in each voltage level area;

A judgment module used to judge whether the total active power imbalance rate exceeds the threshold range and whether the active power imbalance rate in each voltage level area is 0;

The analysis and diagnosis module is used to analyze the voltage level area where the active power imbalance rate is not 0 and diagnose the active power imbalance factors.

Further, the analysis and diagnosis module includes:

The first diagnostic analysis unit is used to calculate the current, voltage and active power information of the 220kv, 110kv, 35kv and 10kv sides of the entire station, and comprehensively diagnose whether the active power of the entire station is balanced. When the active power of the entire station is unbalanced, the active power is determined according to the voltage level. Unbalanced area;

The second diagnostic analysis unit, when the active power of the whole station is unbalanced, is used to compare the 220kV voltage level area lines, 220kV main transformer side, bus voltage and current information with the bus voltage information of the corresponding voltage level, and comprehensively calculate the 220kV voltage level area. Is the active power balanced? If not, it can be concluded that the active power imbalance factors are 220kV voltage acquisition abnormality, three-phase current imbalance, CT current transformer accuracy or CT current transformer failure, PT transformer accuracy or PT transformer failure;

The third diagnostic analysis unit, when the active power of the whole station is unbalanced, is used to compare the 110kV voltage level area lines, 110kV main transformer side, bus voltage and current information with the bus voltage information of the corresponding voltage level, and comprehensively calculate the 110kV voltage level area. Is the active power balanced? If not, it can be concluded that the active power imbalance factors are 110kV voltage acquisition abnormality, three-phase current imbalance, CT current transformer accuracy or CT current transformer failure, PT transformer accuracy or PT transformer failure;

The fourth diagnostic analysis unit, when the active power of the whole station is unbalanced, is used to compare the 35kV voltage level area lines, 22035kV main transformer side, bus voltage and current information with the bus voltage information of the corresponding voltage level, and comprehensively calculate the 35kV voltage level area Is the active power balanced? If not, it can be concluded that the active power imbalance factors are 35kV voltage acquisition abnormality, three-phase current imbalance, CT current transformer accuracy or CT current transformer failure, PT transformer accuracy or PT transformer failure;

The fifth diagnostic analysis unit, when the active power of the whole station is unbalanced, is used to compare the 10kV voltage level area line, 10kV main transformer side, bus voltage and current information with the bus voltage information of the corresponding voltage level, and comprehensively calculate the 10kV voltage level area Is the active power balanced? If not, it can be concluded that the active power imbalance factors are 10kV voltage acquisition abnormality, three-phase current imbalance, CT current transformer accuracy or CT current transformer failure, PT transformer accuracy or PT transformer failure;

The sixth diagnostic analysis unit is used to analyze the current, voltage, active power and reactive power information of the 220kv, 110kv, 35kv and 10kv sides of the transformer in combination with the configured transformer load loss rate, and conclude that the active power imbalance factor is the transformer load loss;

The seventh diagnostic analysis unit is used to analyze the current, voltage, active power and reactive power information of the 220kv, 110kv, 35kv and 10kv sides of the transformer in combination with the configured transformer impedance and transformation ratio characteristics, and conclude that the active power imbalance factor is the transformer system voltage Abnormality and outlet voltage abnormality.

A computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the above active power imbalance analysis and diagnosis method. .

Compared with the prior art, the present invention has the following advantages and beneficial effects:

The invention provides an active power imbalance rate analysis and diagnosis method, system and computer equipment. By establishing a primary equipment component model for the primary equipment of the smart substation, configuring parameters according to the voltage level, and then importing and identifying the measurement and control device in the SCD file information, match and generate a primary main wiring system, and determine whether it exceeds the threshold range by first calculating the total active power unbalance rate of the entire station. When the threshold range is exceeded, the active power unbalance rate is calculated by region according to the voltage level, and the active power unbalance rate is calculated accordingly. Analyze and diagnose the cause of the voltage area where the power imbalance rate is not 0. In this way, regional diagnostic analysis is performed according to the voltage level, which narrows the scope of analysis and diagnosis. It can quickly find out the cause of active power imbalance and avoid long-term operation of smart substations with imbalance warnings. state.

Description of the drawings

The drawings described here are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation to the embodiments of the present invention. In the attached picture:

Figure 1 is a schematic flow chart of an active power imbalance rate analysis and diagnosis method provided by Embodiment 1 of the present invention;

Figure 2 is a specific flow diagram of step S30 in Figure 1;

Figure 3 is a schematic diagram of the primary main wiring system provided by Embodiment 1 of the present invention;

Figure 4 is a schematic diagram of active power imbalance analysis and diagnosis of each voltage level provided by Embodiment 1 of the present invention;

Figure 5 is a schematic diagram of the functional modules of an active power imbalance rate analysis and diagnosis system provided in Embodiment 2 of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples and drawings. The schematic embodiments of the present invention and their descriptions are only used to explain the present invention and do not as a limitation of the invention.

At present, there is no research on the calculation, simulation and control regulation of large power grid active power in the country, but there is no research on the diagnosis and analysis of the causes of active power imbalance in substations. However, in recent years, smart substations often have the phenomenon that the active power imbalance rate of the power station is relatively large for a long time. It poses a great threat to the safe and stable operation of the power grid. However, it is currently not possible to quickly find out the cause of active power imbalance, causing smart substations to run in an imbalance alarm state for a long time.

Therefore, the present invention proposes an active power imbalance analysis and diagnosis method, system and computer equipment based on a smart substation, mainly to solve the problem that the existing technology often cannot quickly find the cause of the active power imbalance when the active power imbalance rate is large. question, it should be noted that the active power imbalance analysis and diagnosis method, system and computer equipment provided by the present invention are not limited to application in smart substations, but can also be applied to other large power grids.

Embodiment 1

As shown in Figure 1, the present invention provides a substation active power imbalance analysis and diagnosis method, which includes the following steps:

S10: Establish a primary equipment component model of the smart substation, and configure the primary equipment component model parameters according to the voltage level;

Among them, the primary equipment of the smart substation includes but is not limited to busbars, lines, bus ties, transformers, CT transformers, PT transformers and circuit breakers. The component model refers to establishing the corresponding busbar component model, line component model, Bus tie component model, transformer component model, etc.

Among them, the voltage levels include four voltage levels: 220kv, 110kv, 35kv and 10kv. Specifically, they include variable ratio configuration of CT transformers and PT transformers; parameterization of line length, inductive reactance, impedance, capacitive reactance and compensation coefficient of the line. Configuration; configure parameters for main transformer impedance, transformation ratio characteristics, load loss, and no-load loss.

S20: Import the SCD file of the smart substation and identify the measurement and control device information in the SCD file;

Among them, the SCD file is the whole station system configuration information file, including the system configuration information of the entire smart substation. The measurement and control device information includes but is not limited to line measurement and control device information, busbar measurement and control device information, transformer measurement and control device information and bus tie measurement and control device information.

S30: Match the measurement and control device information with the primary equipment component model to generate the primary main wiring system;

Among them, by matching the parameters of each component in the measurement and control device information with the parameters configured according to the voltage level of the primary equipment component model, a primary wiring system is generated. The primary wiring system can reflect the data information of the entire smart substation and can intuitively conduct operations on the entire smart substation. Analysis provides a basis for subsequent active power calculation and analysis and diagnosis.

S40: Extract the sampling data information of the measurement and control device and display it on the corresponding primary equipment component model in the primary main wiring system to form active power flow information;

Specifically, the IP address of the measurement and control device in the SCD file of the smart substation is automatically read, and then the sampling data information of the measurement and control device is extracted at the station control layer of the smart substation, and the sampling data information is displayed on the corresponding primary equipment of the primary main wiring system. In the component model, active power flow information is formed based on the sampled data information displayed in the primary equipment component model.

Among them, the sampling data information includes voltage sampling information, current sampling information, active power information, power factor information, circuit breaker position information and knife switch position information.

S50: The first full-station calculation: calculate the total active power imbalance rate of the smart substation based on the active power flow information and sampling data information;

S60: The second voltage level area calculation: If the total active power imbalance rate exceeds the threshold range, the area is divided according to the voltage level to calculate the active power imbalance rate in each area;

Among them, the calculation formula of the active power unbalance rate is: P _input is the active power input, and P _output is the active power output; the active power input and active power output are determined based on the active power flow information and sampling data information, which facilitates the calculation of the active power unbalance rate of the entire station and the active power in each voltage level area. Power imbalance rate.

Among them, the threshold range is ±1%. When the calculated active power imbalance rate of the whole station exceeds ±1%, the active power imbalance rate will be divided into regions according to the voltage level (i.e. 220kv, 110kv, 35kv and 10kv). For calculation, first calculate the total active power imbalance rate of the entire station and determine whether it is too large, and then further calculate and determine the voltage level area. This can narrow the scope of analysis and diagnosis and quickly find out the cause of the active power imbalance.

S70: Perform imbalance diagnosis analysis on the voltage level area where the calculated active power imbalance rate is not equal to 0 and obtain the diagnosis result.

Among them, the voltage level area where the active power imbalance rate is not equal to 0 is located, analyzed and diagnosed, and the scope of analysis and diagnosis is narrowed to quickly find out the cause of the active power imbalance.

The present invention provides an active power imbalance analysis and diagnosis method by establishing a primary equipment component model for the primary equipment of a smart substation, configuring the parameters of the primary equipment component model according to the voltage level, and then importing the SCD file of the smart substation and identifying the SCD file. The measurement and control device information in the system is used to generate a primary main wiring system; through the smart substation station control layer communication access, the sampling data information of the measurement and control device is extracted and displayed on the corresponding primary equipment model in the primary main wiring system to form active power flow information ;Calculate the total active power imbalance rate of the smart substation based on the active power flow information and sampling data information, and determine whether the active power exceeds ±1%. If it exceeds, divide the regions according to the voltage level to calculate the active power imbalance rate in each region; Finally, the imbalance diagnosis analysis is performed on the voltage level area where the calculated active power imbalance rate is not equal to 0 and the diagnosis results are obtained. Calculating the active power imbalance rate by dividing voltage level areas and narrowing the scope of analysis and diagnosis can quickly find out the cause of active power imbalance and avoid long-term operation of smart substations in an imbalance alarm state.

As shown in Figure 2, step 30 matches the measurement and control device information with the component model to generate a primary wiring system, which specifically includes the following steps:

S31: Match the line measurement and control device information of 220kv, 110kv, 35kv and 10kv with the line component model of the corresponding voltage level;

S32: Match the bus measurement and control device information of 220kv, 110kv, 35kv and 10kv with the bus component model of the corresponding voltage level;

S33: Match the 220kv, 110kv, 35kv and 10kv transformer measurement and control device information with the transformer component model of the corresponding voltage level;

S34: Match the bus link measurement and control device information of 220kv, 110kv, 35kv and 10kv with the bus link component model of the corresponding voltage level;

S35: After all the measurement and control device information is matched to the primary equipment component model, a primary main wiring system is generated.

By matching the line measurement and control device information, busbar measurement and control device information, transformer measurement and control device information and bus tie measurement and control device information with the corresponding primary component model of the corresponding level, after the matching is completed, the primary main wiring system is automatically generated and associated with the measurement and control device information. It provides a basis for subsequent calculation of active power imbalance rate and analysis and diagnosis.

As shown in Figure 3, if the entire smart substation is in an active power balance state, that is, the active power of the entire station is:

P1+P2+P9+P10+P13+P14+P15+P16=0.

220kV area: P1+P2+P4+P5=0;

220kV I mother area: P1+P3+P4=0;

220kV II mother area: P2+(-p3)+p5=0.

1# main transformer area: P4+P6+P11=0;

2# main transformer area: P5+P7+P12=0.

110kV area: P6+P7+P9+P10=0;

110kV I mother area: P6+P8+P9=0;

110kV II mother area: P7+(-p8)+p10=0.

10kV area: P11+P12+P13+P14+P15+P16=0;

10kV I mother area: P11+P13+P4+P17=0;

10kV II mother area: P12+P15+p16+P17=0.

In practical applications, the active power of the entire station is not 0, and the active power in each voltage level area is not all 0. Therefore, the present invention first calculates and determines the active power imbalance rate of the entire station, and then calculates the active power in each voltage level area. The active power imbalance rate is calculated and judged, and the voltage level area of the active power imbalance is located, so as to narrow the scope of analysis and diagnosis and quickly find out the cause of the active power imbalance.

As shown in Figure 4, step 70 is to perform imbalance diagnosis analysis on the voltage level area where the calculated active power imbalance rate is not equal to 0 and obtain the diagnosis result, which specifically includes the following steps:

Comparing the regional line, main transformer side, bus voltage and current information of 220kv, 110kv, 35kv and 10kv with the bus voltage information of the corresponding voltage levels, it is concluded that the active power imbalance factors are abnormal voltage acquisition and three-phase current imbalance. , CT current transformer accuracy or CT current transformer failure, PT transformer accuracy or PT transformer failure;

Combined with the configuration of the transformer load loss rate, the current, voltage, active power and reactive power information of the 220kv, 110kv, 35kv and 10kv sides of the transformer were analyzed, and it was concluded that the active power imbalance factor was the abnormal load loss of the transformer.

By analyzing the current, voltage, active power and reactive power information of the 220kv, 110kv, 35kv and 10kv sides of the transformer based on the impedance and ratio characteristics of the configured transformer, it is concluded that the active power imbalance factors are abnormal voltage of the transformer system and abnormal outlet voltage.

By locating and analyzing the measurement and control device in the voltage level area where the active power is unbalanced, the corresponding diagnosis results are obtained, that is, the active power unbalance factors are CT abnormality, PT abnormality, current acquisition abnormality, voltage acquisition abnormality, Collect one or more of abnormal accuracy, abnormal power factor, abnormal merging unit, abnormal main transformer voltage ratio, abnormal on-load load loss and abnormal main transformer output system voltage, so as to quickly find out the cause of active power imbalance and facilitate Corresponding measures will be taken to solve the problem and maintain the stable operation of the smart substation.

An active power imbalance analysis and diagnosis method provided by the present invention is applied to a smart substation by establishing a primary equipment component model for the primary equipment of the smart substation, configuring the parameters of the primary equipment component model according to the voltage level, and then importing it into the smart substation. SCD file and identify the measurement and control device information in the SCD file to generate a primary main wiring system; through smart substation station control layer communication access, extract the sampling data information of the measurement and control device and display it in the corresponding primary equipment model in the primary main wiring system , to form active power flow information; calculate the total active power unbalance rate of the smart substation based on the active power flow information and sampling data information, and determine whether the active power exceeds ±1%. If it exceeds, divide the regions according to the voltage level and calculate the Active power imbalance rate; finally, perform imbalance diagnosis analysis on the voltage level area where the calculated active power imbalance rate is not equal to 0 and obtain the diagnosis results. Calculate the active power imbalance rate by dividing the voltage level area, narrow the scope of analysis and diagnosis, and quickly find out the cause of the active power imbalance.

Embodiment 2

As shown in Figure 5, this embodiment provides an active power imbalance analysis and diagnosis system, including:

The model building module is used to establish primary equipment component models for primary equipment in smart substations;

Parameter configuration module, used to configure parameters for the primary component model;

Import identification module, used to import SCD files of smart substations and identify measurement and control device information in SCD files;

Matching generation module, used to match the measurement and control device information with the primary equipment component model and generate a primary main wiring system

The extraction and formation module is used to extract the sampling data information of the measurement and control device and display and form the active power flow information in the corresponding primary equipment component model in the primary main wiring system;

The calculation module is used to calculate the total active power imbalance rate of the smart substation and calculate the active power imbalance rate in each voltage level area;

The judgment module is used to judge the total active power imbalance rate and the active power imbalance rate in each voltage level area.

The analysis and diagnosis module is used to analyze the active power imbalance rate in each voltage level area and diagnose the active power imbalance factors.

Wherein, the analysis and diagnosis module includes a first diagnosis and analysis unit, a second diagnosis and analysis unit, a third diagnosis and analysis unit, a fourth diagnosis unit, a fifth diagnosis unit, a sixth diagnosis unit and a seventh diagnosis and analysis unit,

The first diagnostic analysis unit is used to calculate the current, voltage and active power information of the 220kv, 110kv, 35kv and 10kv sides of the entire station, and comprehensively diagnose whether the active power of the entire station is balanced. When the active power of the entire station is unbalanced, the active power is determined according to the voltage level. Imbalanced area;

The second diagnostic analysis unit, when the active power of the whole station is unbalanced, is used to compare the 220kV voltage level area lines, 220kV main transformer side, bus voltage and current information with the bus voltage information of the corresponding voltage level, and comprehensively calculate the 220kV voltage level area. Is the active power balanced? If not, it can be concluded that the active power imbalance factors are 220kV voltage acquisition abnormality, three-phase current imbalance, CT current transformer accuracy or CT current transformer failure, PT transformer accuracy or PT transformer failure;

The third diagnostic analysis unit, when the active power of the whole station is unbalanced, is used to compare the 110kV voltage level area lines, 110kV main transformer side, bus voltage and current information with the bus voltage information of the corresponding voltage level, and comprehensively calculate the 110kV voltage level area. Is the active power balanced? If not, it can be concluded that the active power imbalance factors are 110kV voltage acquisition abnormality, three-phase current imbalance, CT current transformer accuracy or CT current transformer failure, PT transformer accuracy or PT transformer failure;

The fourth diagnostic analysis unit, when the active power of the whole station is unbalanced, is used to compare the 35kV voltage level area lines, 22035kV main transformer side, bus voltage and current information with the bus voltage information of the corresponding voltage level, and comprehensively calculate the 35kV voltage level area Is the active power balanced? If not, it can be concluded that the active power imbalance factors are 35kV voltage acquisition abnormality, three-phase current imbalance, CT current transformer accuracy or CT current transformer failure, PT transformer accuracy or PT transformer failure;

The fifth diagnostic analysis unit, when the active power of the whole station is unbalanced, is used to compare the 10kV voltage level area line, 10kV main transformer side, bus voltage and current information with the bus voltage information of the corresponding voltage level, and comprehensively calculate the 10kV voltage level area Is the active power balanced? If not, it can be concluded that the active power imbalance factors are 10kV voltage acquisition abnormality, three-phase current imbalance, CT current transformer accuracy or CT current transformer failure, PT transformer accuracy or PT transformer failure;

The sixth diagnostic analysis unit is used to analyze the current, voltage, active power and reactive power information of the 220kv, 110kv, 35kv and 10kv sides of the transformer in combination with the configured transformer load loss rate, and conclude that the active power imbalance factor is the transformer load loss;

The seventh diagnostic analysis unit is used to analyze the current, voltage, active power and reactive power information of the 220kv, 110kv, 35kv and 10kv sides of the transformer in combination with the configured transformer impedance and transformation ratio characteristics, and conclude that the active power imbalance factor is the transformer system voltage Abnormality and outlet voltage abnormality.

For specific limitations on the active power imbalance analysis and diagnosis system, please refer to the limitations on the active power imbalance analysis and diagnosis method in Embodiment 1, which will not be described again here. Each module in the above-mentioned active power imbalance analysis and diagnosis system can be realized in whole or in part by software, hardware and their combination. Each of the above modules may be embedded in or independent of the processor of the computer device in the form of hardware, or may be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

Embodiment 3

This embodiment provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. The feature is that when the processor executes the computer program, The above-mentioned active power imbalance analysis and diagnosis method, for example, steps S10 to S70 shown in Figure 1 . Alternatively, when the processor executes the computer program, the functions of each module/unit of the active power imbalance analysis and diagnosis system in the above embodiment are implemented, such as the functions of each module shown in Figure 4 . To avoid repetition, they will not be repeated here.

The above-described specific embodiments further describe the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above-mentioned are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (8)

1. An active power imbalance analysis and diagnosis method is characterized by comprising the following steps:

s10: establishing an intelligent substation primary equipment element model, and configuring parameters of the primary equipment element model according to voltage levels;

s20: importing an SCD file of the intelligent substation, and identifying measurement and control device information in the SCD file;

s30: matching the measurement and control device information with the primary equipment element model to generate a primary main wiring system;

s40: extracting sampling data information of the measurement and control device, and displaying the sampling data information in the primary equipment element model corresponding to the primary main wiring system to form active power flow information;

s50: total active power unbalance rate calculation of the total station: calculating the total active power unbalance rate of the intelligent substation according to the active power flow information and the sampling data information;

s60: calculating the active power unbalance rate of the voltage class area: if the total active power unbalance rate exceeds a threshold range, dividing the area according to the voltage grade to calculate the active power unbalance rate of each area;

s70: hierarchical voltage region diagnostic analysis: carrying out unbalance diagnosis analysis on the calculated voltage class area with the active power unbalance rate not equal to 0 and obtaining a diagnosis result;

the step S70 specifically includes:

comparing the line, main transformer side, bus voltage and current information of each voltage class area of 220kv, 110kv, 35kv and 10kv with the bus voltage information of the corresponding voltage class to obtain active power unbalance factors which are abnormal voltage acquisition, three-phase current unbalance, CT current transformer precision or CT current transformer fault, PT transformer precision or PT transformer fault;

analyzing current, voltage, active power and non-power information of the transformer at 220kv, 110kv, 35kv and 10kv sides by combining with the load loss rate of the configured transformer to obtain an active power unbalanced factor which is abnormal load loss of the transformer;

and combining the configuration transformer impedance, the variable bit characteristic analysis transformers 220kv, 110kv, 35kv and 10kv side currents, voltages and active power to obtain the active power unbalance factors which are abnormal voltage of the transformer system and abnormal voltage of an outlet.

2. The active power unbalance analysis and diagnosis method according to claim 1, wherein the primary equipment of the intelligent substation comprises a bus bar, a line, a bus bar, a transformer, a CT transformer, a PT transformer and a circuit breaker.

3. The active power unbalance analysis and diagnosis method according to claim 2, wherein the step S10 includes configuring parameters of the element model according to four voltage levels of 220kv, 110kv, 35kv and 10kv, and specifically includes:

performing transformation ratio configuration on a CT transformer and a PT transformer;

carrying out parameter configuration on the line length, the inductive reactance, the impedance, the capacitive reactance and the compensation coefficient of the line;

and carrying out parameter configuration on the main transformer impedance, the transformation ratio characteristic, the load loss and the no-load loss.

4. The active power imbalance analysis and diagnosis method of claim 1, wherein the sampling data information includes voltage sampling information, current sampling information, active power information, power factor information, breaker position information, and knife switch position information.

5. The active power unbalance analysis and diagnosis method according to claim 2, wherein the measurement and control device information includes line measurement and control device information, bus measurement and control device information, transformer measurement and control device information and bus joint measurement and control device information.

6. The active power unbalance analysis and diagnosis method according to claim 5, wherein the step S30 specifically comprises the steps of:

s31: matching the information of the line measurement and control devices with the voltage levels of 220kv, 110kv, 35kv and 10kv with line element models with corresponding voltage levels;

s32: matching the bus measurement and control device information of 220kv, 110kv, 35kv and 10kv with bus element models of corresponding voltage grades;

s33: matching the information of the transformer measurement and control devices of 220kv, 110kv, 35kv and 10kv with transformer element models of corresponding voltage grades;

s34: matching the information of the bus-tie measurement and control device with 220kv, 110kv, 35kv and 10kv with a bus-tie element model with corresponding voltage level;

s35: and after the measurement and control device information is completely matched with the primary equipment element model, a primary main wiring system is generated.

7. An active power imbalance analysis and diagnosis system, comprising:

the model building module is used for building a primary equipment element model for primary equipment of the intelligent substation;

the parameter configuration module is used for carrying out parameter configuration on the primary equipment element model;

the importing identification module is used for importing the SCD file of the intelligent substation and identifying the measurement and control device information in the SCD file;

the matching generation module is used for matching the measurement and control device information with the primary equipment element model and generating a primary main wiring system

The extraction and formation module is used for extracting sampling data information of the measurement and control device and displaying and forming active power flow information in the primary equipment element model corresponding to the primary main wiring system;

the analysis and diagnosis module is used for analyzing and diagnosing the active power of the total station and the active power of each voltage class area;

the analytical diagnostic module includes:

the first diagnosis and analysis unit is used for calculating current, voltage and active power information of 220kv, 110kv, 35kv and 10kv sides of the total station, comprehensively diagnosing whether the active power of the total station is balanced, and determining an active imbalance area according to voltage levels when the active power of the total station is unbalanced;

the second diagnosis and analysis unit is used for comparing the 220kV voltage level region line, the 220kV main transformer side, the bus voltage and current information with bus voltage information of corresponding voltage levels when the total station active power is unbalanced, comprehensively calculating whether the active power in the 220kV voltage level region is balanced or not, and obtaining that the active power unbalance factors are abnormal 220kV voltage acquisition, three-phase current unbalance, CT current transformer precision or CT current transformer fault, PT transformer precision or PT transformer fault if the active power unbalance factors are unbalanced;

the third diagnosis and analysis unit is used for comparing the 110kV voltage level area line, the 110kV main transformer side, the bus voltage and current information with the bus voltage information of the corresponding voltage level when the total station active power is unbalanced, comprehensively calculating whether the active power in the 110kV voltage level area is balanced or not, and obtaining that the active power unbalance factor is 110kV voltage acquisition abnormality, three-phase current unbalance, CT current transformer precision or CT current transformer fault, PT transformer precision or PT transformer fault if the active power unbalance factor is unbalanced;

the fourth diagnosis analysis unit is used for comparing the 35kV voltage class area line, the 22035kV main transformer side, the bus voltage and current information with bus voltage information of corresponding voltage classes when the total station active power is unbalanced, comprehensively calculating whether the active power in the 35kV voltage class area is balanced or not, and obtaining that the active power unbalance factors are abnormal 35kV voltage acquisition, three-phase current unbalance, CT current transformer precision or CT current transformer fault, PT transformer precision or PT transformer fault if the active power unbalance factors are unbalanced;

the fifth diagnosis and analysis unit is used for comparing the line, the 10kV main transformer side, the bus voltage and current information of the 10kV voltage class area with the bus voltage information of the corresponding voltage class when the total station active power is unbalanced, comprehensively calculating whether the active power of the 10kV voltage class area is balanced or not, and obtaining that the active power unbalance factors are 10kV voltage acquisition abnormality, three-phase current unbalance, CT current transformer precision or CT current transformer fault, PT transformer precision or PT transformer fault if the active power unbalance factors are unbalanced;

the sixth diagnostic analysis unit is used for analyzing current, voltage, active power and reactive power information of the 220kv, 110kv, 35kv and 10kv sides of the transformer in combination with the configured transformer load loss rate to obtain an active power unbalance factor as transformer load loss;

and a seventh diagnosis and analysis unit, which is used for analyzing the current, voltage, active power and reactive power information of the transformer 220kv, 110kv, 35kv and 10kv sides in combination with the configuration transformer impedance and the variable bit property to obtain the active power unbalance factors which are the abnormal voltage of the transformer system and the abnormal voltage of the outlet.

8. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the active power imbalance analysis diagnostic method according to any one of claims 1 to 6 when executing the computer program.