CN112446801B - System and method for improving data quality of power system - Google Patents
System and method for improving data quality of power system Download PDFInfo
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Abstract
The invention relates to a system and a method for improving the data quality of a power system, which mainly comprise the following components: the system comprises a front verification module, a model verification module, a data verification module and a graph verification module; the pre-verification module is mainly used for link verification and pre-non-actual measurement verification; the model checking module is used for parameter checking, model checking and topology checking; the data verification module is mainly used for quality code verification, unbalance amount verification and network topology analysis verification; the graphic verification module is used for recording and verifying whether the station diagram is missing or not according to the station table, verifying whether the station diagram and the station ID are correct or not, verifying whether the ID of each device in the station diagram is missing or not, finding whether the device ID can be found or not, and judging whether the device ID belongs to the station or not. The invention can find out the data with problems in the power system, can effectively improve the data quality of the power system after rectification, and ensures that the information-based power system dispatching center can efficiently, accurately and comprehensively track and know the running condition of the power grid.
Description
Technical Field
The invention belongs to the technical field of power systems, and particularly relates to a system and a method for improving data quality of a power system.
Background
With the high-speed development of the ultra-high voltage transmission technology in China, the regional power grids are gradually interconnected in China, so that the power grid scale is continuously enlarged. The new energy power generation and the distributed power generation are connected in a large quantity, so that the complexity is increased for a large power grid, and the power grid in China has the characteristics of large and complex.
When the intelligent equipment, the protection device and the like of the transformer substation have equipment faults or communication faults, the monitoring system and the acquisition end of the transformer substation still continue to acquire measurement information, and bad data information can be generated at the moment. The information is uploaded to a master station system, the master station state estimation result is affected, the master station state estimation processes and analyzes the uploaded data to form a state estimation result, and the data abnormality is displayed to a scheduling maintainer for correct processing. But the problem of low overall data quality of the system cannot be fundamentally solved by only relying on the decision of scheduling maintenance personnel.
Therefore, an automatic method is urgently needed to improve the data quality in the power system, so that the result of power system state estimation can be improved, and the information-based power system dispatching center can efficiently, accurately and comprehensively track and know the running condition of the power grid. The measurement data obtained by the dynamic processing can truly feed back the relevant states of the operation conditions, which is the important issue of real-time analysis and real-time control of the power grid system. The accuracy and the dynamics of the data in the power system play an important role in the overall analysis, scientific management and control and decision making of the power grid system.
Disclosure of Invention
The invention aims to provide a system and a method for improving the data quality of a power system, which can find out problematic data in the power system, and can effectively improve the data quality of the power system after rectification, thereby ensuring that an informationized power system dispatching center can efficiently, accurately and comprehensively track and know the running condition of a power grid.
In order to solve the technical problems, the invention adopts the following technical scheme:
A system for improving the data quality of an electric power system, which mainly comprises the following components: the system comprises a front verification module, a model verification module, a data verification module and a graph verification module; the pre-verification module is mainly used for link verification and pre-non-actual measurement verification; the model checking module is used for parameter checking, model checking and topology checking; the data verification module is mainly used for quality code verification, unbalance amount verification and network topology analysis verification; the graphic verification module is used for recording and verifying whether the station diagram is missing or not according to the station table, verifying whether the station diagram and the station ID are correct or not, verifying whether the ID of each device in the station diagram is missing or not, finding whether the device ID can be found or not, and judging whether the device ID belongs to the station or not.
Further, the data verification module also has other verification functions.
A method of enhancing a system for enhancing data quality of an electrical power system, comprising the steps of:
⑴ And (3) link verification: the front-end verification module performs front-end link state verification to find out a link with a problem, so that the front-end link can be ensured to be normally used;
⑵ Leading non-actual measurement test: the front-end verification module verifies whether the data in the acquisition point list is acquired or not, and counts the data which are provided with point numbers but are abnormally sent;
⑶ Parameter checking: the model checking module checks whether the parameter model of the line, the transformer, the winding parameters, the gear parameters and the series-parallel compensation equipment is correct;
⑷ And (3) model checking: the model checking module checks the corresponding relation between the line segment and the line segment end point of the line, and checks the corresponding relation between the transformer and the transformer winding; checking whether the winding type, double winding or three windings of the transformer are correct; checking whether the winding type of the transformer winding is correct, whether the high, medium and low voltage sides are maintained accurately, and whether the voltage class of each winding is accurate;
⑸ And (3) topology verification: the model checking module checks whether the connection point numbers of all the devices are missing or not and whether the voltage levels of the devices are correct or not;
⑹ And (3) checking a quality code: the data verification module finds all the telemetry remote signaling points which are not collected in advance, and the quality codes of the telemetry remote signaling points are set to be non-actual measurement; finding all the remote measuring points which do not change for a long time, and setting the quality codes of the remote measuring points as unchanged; finding all suspicious telemetry remote signaling points, and placing the quality codes of the suspicious telemetry remote signaling points as suspicious;
⑺ Unbalance amount verification: the data verification module judges unbalance amounts of the bus, the circuit and the transformer, and if unbalance occurs, the data verification module performs problem investigation on the related data;
⑻ And (3) network topology analysis and verification: the data verification module calculates the communication relation among the devices according to the information of the connection point number fields in the device table, calculates the topology coloring of the devices, and the devices with the same coloring value are in the same island, namely all the devices with the same island number are communicated;
⑼ And (3) graph verification: the graphic verification module records whether a station diagram is missing or not according to the station table, whether the station diagram and the station ID are correct or not is verified, whether the ID of each device in the station diagram is missing or not is verified, whether the device ID can be found or not, and whether the device ID belongs to the station or not is verified.
Further, the step ⑹ classifies its quality code as suspicious as follows:
a) Suspicious measurements corresponding to telemetry by remote signaling:
Identifying telemetry of bus, transformer windings, loads, generators and alternating current line end points and corresponding associated breaker states, and carrying out key identification when the condition that remote signaling is divided telemetry with a value or the condition that the remote signaling is combined telemetry without a value is occurred;
b) Suspicious measurement corresponding to active power, reactive power and current:
According to The principle is that problematic data are identified;
c) The balance measurement can be measured:
And determining whether related remote signaling and remote measurement are correct according to the balance state.
The bus active imbalance criterion:
Wherein: p j is the active injection of branch j connected by bus i; epsilon Pbus is the bus active imbalance threshold value;
bus reactive unbalance criterion:
wherein: q j is the active injection of branch j connected by bus i; epsilon Qbus is the bus active imbalance threshold value;
Line active imbalance criterion:
|Pi+Pj-Ploss|>εPine
Wherein: p i、Pj is the active power of the i end and the j end of the line ij flowing into the line respectively; p loss is the active loss of the line ij; epsilon Pline is the line active imbalance threshold;
line reactive unbalance criterion:
|Qi+Qj-Qloss|>εQine
Wherein: q i、Qj is the active power of the i end and the j end of the line ij flowing into the line respectively; p loss is the active loss of the line ij; epsilon Pline is the line active imbalance threshold;
Transformer active unbalance criterion:
Wherein: p j is the active power of the j-roll inflow transformer of transformer i; p loss is the active loss of volume j; epsilon Ptran is the transformer active imbalance threshold value;
reactive unbalance criterion of transformer:
Wherein: q j is the active power of the j-roll inflow transformer of transformer i; q loss is the active loss of volume j; epsilon Qtran is the transformer active imbalance threshold value;
PQI mismatch criterion:
|Ical-Iscada|>εI
Wherein: i cal is a current value calculated according to the active, reactive and connected bus voltage of the equipment; i scada is the measured current value; epsilon I is the PQI mismatch threshold.
Further, the step ⑺ further includes evaluating the data quality of the line and the transformer device:
① And (3) evaluating the line work load:
wherein: Δs i is the i-terminal active power measurement score change value of the line; let i end of circuit link to each other with generating line k, have:
d) If the bus k is in active balance, the i end of the connected line is qualified in active measurement, otherwise, the i end of the connected line is unqualified;
e) If the active balance of the circuit is found, the i-terminal active measurement is qualified, otherwise, the i-terminal active measurement is unqualified;
f) If the PQI of the line i end is matched, the local end has a good work and measures to be qualified, otherwise, the local end does not pass;
② And (5) evaluating the line no-load quantity:
Wherein: delta S i is the i-terminal reactive power measurement score change value of the line; let i end of circuit link to each other with generating line k, have:
g) If the bus k is in reactive balance, the reactive power measurement of the i end of the connected line is qualified, otherwise, the reactive power measurement of the i end of the connected line is unqualified;
h) If the line is in reactive balance, the reactive power measurement of the i end is qualified, otherwise, the reactive power measurement of the i end is unqualified;
i) If the PQI of the line i end is matched, the reactive power measurement of the line i end is qualified, otherwise, the line i end is unqualified.
③ And (3) evaluating the transformer work load:
wherein: Δs i is the active amount measurement score change value of transformer coil i; let transformer volume i belong to transformer j and link to each other with busbar k, have:
j) If the bus k is in active balance, the active power of the connected transformer i is qualified, otherwise, the connected transformer i is unqualified;
k) If the active balance of the transformer j is found, the active measurement of the transformer i is qualified, otherwise, the active measurement of the transformer i is unqualified;
l) if the PQIs of the transformer coil i are matched, the transformer is qualified in the active measurement, otherwise, the transformer is unqualified.
④ And (3) measuring and evaluating the reactive power of the transformer:
wherein: Δs i is the reactive power measurement score change value of transformer coil i; let transformer i belong to transformer j and link to each other with busbar k, have:
m) if the bus k is in reactive balance, the reactive power measurement of the connected transformer i is qualified, otherwise, the transformer i is unqualified;
n) if the transformer j is in reactive balance, the reactive power measurement of the transformer i is qualified, otherwise, the transformer i is unqualified;
o) if the PQI of the transformer i is matched, the transformer work amount is qualified, otherwise, the transformer work amount is unqualified.
The invention has the advantages and beneficial effects that:
The system for effectively improving the data quality of the power system comprises a front-end verification module, a model verification module, a data verification module and a graph verification module; the front data quality problem is found through the front verification module, so that the accuracy of front link and acquisition is improved; the problem in the model is found through the model checking module, so that the accuracy of the model is improved; the data quality problem in the data processing process is found through the data verification module, so that the correctness of the processed data is improved; and the data quality problem on the station diagram is found through the graphic verification module, so that the data accuracy of interface display is improved. The invention can find out the data with problems in the power system, and can effectively improve the data quality of the power system after rectification, thereby ensuring that the information-based power system dispatching center can efficiently, accurately and omnidirectionally track and know the running condition of the power grid.
Drawings
FIG. 1 is a block diagram of a system for effectively improving the data quality of an electrical power system according to the present invention;
FIG. 2 is a flow chart of a method for improving the data quality of an electric power system according to the present invention.
Detailed Description
The invention is further described in detail below with reference to the attached drawing figures:
As shown in fig. 1, the system for improving the data quality of the power system mainly comprises the following components: the system comprises a front verification module 1, a model verification module 2, a data verification module 3 and a graph verification module 4. The pre-verification module is mainly used for link verification and pre-non-actual measurement verification; the model checking module is used for parameter checking, model checking and topology checking; the data verification module is mainly used for quality code verification, unbalance amount verification and network topology analysis verification; the graphic verification module is used for recording and verifying whether the station diagram is missing or not according to the station table, verifying whether the station diagram and the station ID are correct or not, verifying whether the ID of each device in the station diagram is missing or not, finding whether the device ID can be found or not, and judging whether the device ID belongs to the station or not.
The data verification module also has the following other verification functions.
As shown in fig. 2, the method for improving the data quality of the power system according to the present invention comprises the following steps:
⑴ And (3) link verification: the front-end verification module performs front-end link state verification to find out a link with a problem, so that the front-end link can be ensured to be normally used;
⑵ Leading non-actual measurement test: the front-end verification module verifies whether the data in the acquisition point list is acquired or not, and counts the data which are provided with point numbers but are abnormally sent, so that correction is facilitated;
⑶ Parameter checking: the model checking module checks whether the parameter model of the line, the transformer, the winding parameters, the gear parameters and the series-parallel compensation equipment is correct;
⑷ And (3) model checking: the model checking module checks the corresponding relation between the line segment and the line segment end point of the line, and checks the corresponding relation between the transformer and the transformer winding; checking whether the winding type, double winding or three windings of the transformer are correct; checking whether the winding type of the transformer winding is correct, whether the high, medium and low voltage sides are maintained accurately, and whether the voltage class of each winding is accurate;
⑸ And (3) topology verification: the model checking module checks whether the connection point numbers of all the devices are missing or not and whether the voltage levels of the devices are correct or not;
⑹ And (3) checking a quality code: the data verification module finds all the telemetry remote signaling points which are not collected in advance, and the quality codes of the telemetry remote signaling points are set to be non-actual measurement; finding all the remote measuring points which do not change for a long time, and setting the quality codes of the remote measuring points as unchanged; finding all suspicious telemetry remote signaling points, and placing the quality codes of the suspicious telemetry remote signaling points as suspicious;
⑺ Unbalance amount verification: the data verification module judges unbalance amounts of the bus, the circuit and the transformer, and if unbalance occurs, the data verification module performs problem investigation on the related data;
⑻ And (3) network topology analysis and verification: the data verification module mainly relates to all equipment tables in a model library, and mainly completes the work of calculating the communication relation among the equipment according to the information of the connection point number fields in the equipment tables, calculating the topology coloring of the equipment, wherein the equipment with the same coloring value is in the same island, namely all the equipment with the same island number are communicated; normally, the whole power grid model should be connected together, and island phenomenon occurs in a few cases, namely, the coloring value of most of equipment should be 1; judging the topological coloring value of the full model, if a larger coloring value appears, considering that a model error or a remote signaling error appears, and searching equipment with problems at the boundary of the island;
⑼ And (3) graph verification: the graphic verification module records whether a station diagram is missing or not according to the station table, whether the station diagram and the station ID are correct or not is verified, whether the ID of each device in the station diagram is missing or not is verified, whether the device ID can be found or not, and whether the device ID belongs to the station or not is verified.
The step ⑹ is to place the quality code as suspicious in the following cases:
a) Suspicious measurements corresponding to telemetry by remote signaling:
Identifying telemetry of bus, transformer windings, loads, generators and alternating current line end points and corresponding associated breaker states, and carrying out key identification when the condition that remote signaling is divided telemetry with a value or the condition that the remote signaling is combined telemetry without a value is occurred;
b) Suspicious measurement corresponding to active power, reactive power and current:
According to The principle is that problematic data are identified;
c) The balance measurement can be measured:
And determining whether related remote signaling and remote measurement are correct according to the balance state.
In the step ⑺: the bus active imbalance criterion:
Wherein: p j is the active injection of branch j connected by bus i; epsilon Pbus is the bus active imbalance threshold value;
bus reactive unbalance criterion:
wherein: q j is the active injection of branch j connected by bus i; epsilon Qbus is the bus active imbalance threshold value;
Line active imbalance criterion:
|Pi+Pj-Ploss|>εPine
Wherein: p i、Pj is the active power of the i end and the j end of the line ij flowing into the line respectively; p loss is the active loss of the line ij; epsilon Pline is the line active imbalance threshold;
line reactive unbalance criterion:
|Qi+Qj-Qloss|>εQine
Wherein: q i、Qj is the active power of the i end and the j end of the line ij flowing into the line respectively; p loss is the active loss of the line ij; epsilon Pline is the line active imbalance threshold;
Transformer active unbalance criterion:
Wherein: p j is the active power of the j-roll inflow transformer of transformer i; p loss is the active loss of volume j; epsilon Ptran is the transformer active imbalance threshold value;
reactive unbalance criterion of transformer:
Wherein: q j is the active power of the j-roll inflow transformer of transformer i; q loss is the active loss of volume j; epsilon Qtran is the transformer active imbalance threshold value;
PQI mismatch criterion:
|Ical-Iscada|>εI
Wherein: i cal is a current value calculated according to the active, reactive and connected bus voltage of the equipment; i scada is the measured current value; epsilon I is the PQI mismatch threshold.
The step ⑺ further includes evaluating the data quality of the line and the transformer device:
① And (3) evaluating the line work load:
wherein: Δs i is the i-terminal active power measurement score change value of the line; let i end of circuit link to each other with generating line k, have:
d) If the bus k is in active balance, the i end of the connected line is qualified in active measurement, otherwise, the i end of the connected line is unqualified;
e) If the active balance of the circuit is found, the i-terminal active measurement is qualified, otherwise, the i-terminal active measurement is unqualified;
f) If the PQI of the line i end is matched, the local end has a good work and measures to be qualified, otherwise, the local end does not pass;
② And (5) evaluating the line no-load quantity:
Wherein: delta S i is the i-terminal reactive power measurement score change value of the line; let i end of circuit link to each other with generating line k, have:
g) If the bus k is in reactive balance, the reactive power measurement of the i end of the connected line is qualified, otherwise, the reactive power measurement of the i end of the connected line is unqualified;
h) If the line is in reactive balance, the reactive power measurement of the i end is qualified, otherwise, the reactive power measurement of the i end is unqualified;
i) If the PQI of the line i end is matched, the reactive power measurement of the line i end is qualified, otherwise, the line i end is unqualified.
③ And (3) evaluating the transformer work load:
wherein: Δs i is the active amount measurement score change value of transformer coil i; let transformer volume i belong to transformer j and link to each other with busbar k, have:
j) If the bus k is in active balance, the active power of the connected transformer i is qualified, otherwise, the connected transformer i is unqualified;
k) If the active balance of the transformer j is found, the active measurement of the transformer i is qualified, otherwise, the active measurement of the transformer i is unqualified;
l) if the PQIs of the transformer coil i are matched, the transformer is qualified in the active measurement, otherwise, the transformer is unqualified.
④ And (3) measuring and evaluating the reactive power of the transformer:
wherein: Δs i is the reactive power measurement score change value of transformer coil i; let transformer i belong to transformer j and link to each other with busbar k, have:
m) if the bus k is in reactive balance, the reactive power measurement of the connected transformer i is qualified, otherwise, the transformer i is unqualified; n) if the transformer j is in reactive balance, the reactive power measurement of the transformer i is qualified, otherwise, the transformer i is unqualified; o) if the PQI of the transformer i is matched, the transformer work amount is qualified, otherwise, the transformer work amount is unqualified.
The step ⑺ also includes other checks:
① In order to improve the data quality, some measurement points which are not acquired or are not acquired can be solved by making a formula, wherein the formula can comprise automatic program maintenance and manual maintenance. If the measurement calculation method is regularly circulated, the measurement calculation method can be realized through a program, such as a logic relation between pqi; if there is no rule, then manual maintenance of the formula is required. ② If the data of the line end point of one line segment of the line has the data quality problem in step ⑽ and the opposite side is normal, the data value can be taken as the opposite end generation, that is, the value of the opposite side is equal to the data value of the opposite side to be inverted. ③ Searching all the blocked telemetering remote signaling points in the system, ensuring whether the points should be blocked or not, and setting reasonable telemetering remote signaling values manually while blocking. ④ When the telemetry program writes into a library, the program adds an anti-jump function to prevent the telemetry data from jumping; and adding reasonable upper and lower limit functions to prevent unreasonable larger or smaller values of data.
Claims (4)
1. A method for improving the data quality of an electric power system, which is characterized in that the adopted system mainly comprises the following components: the system comprises a front verification module (1), a model verification module (2), a data verification module (3) and a graph verification module (4); the pre-verification module is mainly used for link verification and pre-non-actual measurement verification; the model checking module is used for parameter checking, model checking and topology checking; the data verification module is mainly used for quality code verification, unbalance amount verification and network topology analysis verification; the graphic verification module is used for recording and verifying whether a station diagram is missing or not according to a station table, verifying whether the station diagram and the station ID are correct or not, verifying whether the ID of each device in the station diagram is missing or not, finding whether the device ID belongs to the station or not, and the lifting method comprises the following steps:
⑴ And (3) link verification: the front-end verification module performs front-end link state verification to find out a link with a problem, so that the front-end link can be ensured to be normally used;
⑵ Leading non-actual measurement test: the front-end verification module verifies whether the data in the acquisition point list is acquired or not, and counts the data which are provided with point numbers but are abnormally sent;
⑶ Parameter checking: the model checking module checks whether the parameter model of the line, the transformer, the winding parameters, the gear parameters and the series-parallel compensation equipment is correct;
⑷ And (3) model checking: the model checking module checks the corresponding relation between the line segment and the line segment end point of the line, and checks the corresponding relation between the transformer and the transformer winding; checking whether the winding type, double winding or three windings of the transformer are correct; checking whether the winding type of the transformer winding is correct, whether the high, medium and low voltage sides are maintained accurately, and whether the voltage class of each winding is accurate;
⑸ And (3) topology verification: the model checking module checks whether the connection point numbers of all the devices are missing or not and whether the voltage levels of the devices are correct or not;
⑹ And (3) checking a quality code: the data verification module finds all the telemetry remote signaling points which are not collected in advance, and the quality codes of the telemetry remote signaling points are set to be non-actual measurement; finding all the remote measuring points which do not change for a long time, and setting the quality codes of the remote measuring points as unchanged; finding all suspicious telemetry remote signaling points, and placing the quality codes of the suspicious telemetry remote signaling points as suspicious;
⑺ Unbalance amount verification: the data verification module judges unbalance amounts of the bus, the circuit and the transformer, and if unbalance occurs, the data verification module performs problem investigation on the related data;
⑻ And (3) network topology analysis and verification: the data verification module calculates the communication relation among the devices according to the information of the connection point number fields in the device table, calculates the topology coloring of the devices, and the devices with the same coloring value are in the same island, namely all the devices with the same island number are communicated;
⑼ And (3) graph verification: the graphic verification module records whether a station diagram is missing or not according to the station table, whether the station diagram and the station ID are correct or not is verified, whether the ID of each device in the station diagram is missing or not is verified, whether the device ID can be found or not, and whether the device ID belongs to the station or not is verified.
2. A method of improving data quality in an electrical power system as claimed in claim 1, wherein:
The step ⑹ is to place the quality code as suspicious in the following cases:
a) Suspicious measurements corresponding to telemetry by remote signaling:
Identifying telemetry of bus, transformer windings, loads, generators and alternating current line end points and corresponding associated breaker states, and carrying out key identification when the condition that remote signaling is divided telemetry with a value or the condition that the remote signaling is combined telemetry without a value is occurred;
b) Suspicious measurement corresponding to active power, reactive power and current:
According to The principle is that problematic data are identified;
c) The balance measurement can be measured:
And determining whether related remote signaling and remote measurement are correct according to the balance state.
3. The method for improving data quality of a power system according to claim 1, wherein in the step ⑺:
the bus active imbalance criterion:
Wherein: p j is the active injection of branch j connected by bus i; epsilon Pbus is the bus active imbalance threshold value;
bus reactive unbalance criterion:
wherein: q j is the active injection of branch j connected by bus i; epsilon Qbus is the bus active imbalance threshold value;
Line active imbalance criterion:
|Pi+Pj-Ploss|>εPine
Wherein: p i、Pj is the active power of the i end and the j end of the line ij flowing into the line respectively; p loss is the active loss of the line ij; epsilon Pline is the line active imbalance threshold;
line reactive unbalance criterion:
|Qi+Qj-Qloss|>εQine
Wherein: q i、Qj is the active power of the i end and the j end of the line ij flowing into the line respectively; p loss is the active loss of the line ij; epsilon Pline is the line active imbalance threshold;
Transformer active unbalance criterion:
Wherein: p j is the active power of the j-roll inflow transformer of transformer i; p loss is the active loss of volume j; epsilon Ptran is the transformer active imbalance threshold value;
reactive unbalance criterion of transformer:
Wherein: q j is the active power of the j-roll inflow transformer of transformer i; q loss is the active loss of volume j; epsilon Qtran is the transformer active imbalance threshold value;
PQI mismatch criterion:
|Ical-Iscada|>εI
Wherein: i cal is a current value calculated according to the active, reactive and connected bus voltage of the equipment; i scada is the measured current value; epsilon I is the PQI mismatch threshold.
4. The method for improving data quality of a power system according to claim 1, wherein said step ⑺ further comprises evaluating data quality of a line and transformer device:
① And (3) evaluating the line work load:
wherein: Δs i is the i-terminal active power measurement score change value of the line; let i end of circuit link to each other with generating line k, have:
d) If the bus k is in active balance, the i end of the connected line is qualified in active measurement, otherwise, the i end of the connected line is unqualified;
e) If the active balance of the circuit is found, the i-terminal active measurement is qualified, otherwise, the i-terminal active measurement is unqualified;
f) If the PQI of the line i end is matched, the local end has a good work and measures to be qualified, otherwise, the local end does not pass;
② And (5) evaluating the line no-load quantity:
Wherein: delta S i is the i-terminal reactive power measurement score change value of the line; let i end of circuit link to each other with generating line k, have:
g) If the bus k is in reactive balance, the reactive power measurement of the i end of the connected line is qualified, otherwise, the reactive power measurement of the i end of the connected line is unqualified;
h) If the line is in reactive balance, the reactive power measurement of the i end is qualified, otherwise, the reactive power measurement of the i end is unqualified;
i) If the PQI of the line i end is matched, the reactive power measurement of the line i end is qualified, otherwise, the line i end is unqualified;
③ And (3) evaluating the transformer work load:
wherein: Δs i is the active amount measurement score change value of transformer coil i; let transformer volume i belong to transformer j and link to each other with busbar k, have:
j) If the bus k is in active balance, the active power of the connected transformer i is qualified, otherwise, the connected transformer i is unqualified;
k) If the active balance of the transformer j is found, the active measurement of the transformer i is qualified, otherwise, the active measurement of the transformer i is unqualified;
l) if the PQI of the transformer coil i is matched, the transformer is qualified in the active measurement, otherwise, the transformer is unqualified;
④ And (3) measuring and evaluating the reactive power of the transformer:
wherein: Δs i is the reactive power measurement score change value of transformer coil i; let transformer i belong to transformer j and link to each other with busbar k, have:
m) if the bus k is in reactive balance, the reactive power measurement of the connected transformer i is qualified, otherwise, the transformer i is unqualified;
n) if the transformer j is in reactive balance, the reactive power measurement of the transformer i is qualified, otherwise, the transformer i is unqualified;
o) if the PQI of the transformer i is matched, the transformer work amount is qualified, otherwise, the transformer work amount is unqualified.
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