System and method for analyzing and evaluating AVC substation of pumped storage power station

Abstract

The invention relates to a pumped storage power station AVC substation analysis and evaluation system and method, and the method comprises the steps: calculating the AVC operation rate in the power generation direction of a unit, the AVC operation rate in the water pumping direction of the unit, and the AVC total operation rate of the unit based on the time of entering a steady state working condition of each unit of a pumped storage power station at a power plant side and the AVC input time of each unit; a power plant side pumped storage power station main transformer high-voltage side 500kV dispatching main station controlled bus voltage is taken as an object, and the proportion of total regulation qualified points, voltage increasing direction locking points and voltage reducing direction locking points in total effective points is executed based on AVC system voltage instructions. And obtaining the 500kV bus voltage regulation qualified rate of the unit power generation direction AVC regulation, the unit water pumping direction AVC regulation and the AVC total regulation when the in-station unit AVC system is put into operation. Compared with the prior art, the method is suitable for analyzing and evaluating the operation condition of the AVC substation system in two operation modes of closed-loop operation and local closed-loop operation when the AVC substation system of the pumped storage power station is connected to the AVC master station.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid dispatching operation analysis and evaluation, and in particular to an analysis and evaluation system and method for an AVC substation of a pumped storage power station. Background Art

[0002] At present, the AVC substation system of the pumped storage power station is planned to operate in the local voltage curve mode. By collecting operating data and analyzing the operating conditions, it will accumulate experience and provide big data support for the future access to the closed-loop operation of the dispatching master station. In the local voltage mode, the dispatching master station cannot count key information such as the AVC operation qualification rate. If it is reported to the dispatch in the form of manual statistical data, it will bring a huge amount of work and cannot quickly retrieve historical operation records. In order to meet the needs of the power grid and power plants, it is an inevitable trend to configure the AVC substation operation analysis system on the power plant side, especially the AVC substation operation analysis system that can be used in pumped storage power stations, to provide the dispatching with AVC substation operation big data and collect key information, which has great engineering use value.

[0003] 1. The existing AVC evaluation system does not propose an evaluation system for the AVC substation of the pumped-storage power station. At present, the AVC substation of the pumped-storage power station of the East China Power Grid is gradually in the installation and commissioning stage. The relevant technology of the evaluation system for the AVC substation of the pumped-storage power station is blank, and it is unable to solve the problem of the grid dispatching for the assessment of the AVC substation system of the pumped-storage power station.

[0004] 2. The existing AVC evaluation system only involves the calculation method of the AVC commissioning rate and qualification rate of the generator sets based on data coding in the power plant. There is no clear explanation on whether the AVC evaluation system is integrated inside the AVC substation on the power plant side or is a separate device placed outside the AVC substation, as well as the grid structure related to the AVC substation, AVC main station, and dispatching data network, which cannot meet the needs of power grid dispatching for the AVC evaluation system.

[0005] 3. The existing AVC evaluation system does not take into account the actual construction of the AVC master station and AVC substation. Especially in the construction of the AVC system of the pumped storage power station, the AVC system of the pumped storage power station has not actually been put into closed-loop operation. The communication between the master station side and the substation side is currently in the early stages of construction. The AVC master station cannot analyze and summarize the operation of the AVC substation system for the pumped storage power station AVC system under multiple operating conditions, frequent activation and deactivation, and operating in the local voltage mode. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide an analysis and evaluation system and method for an AVC substation of a pumped storage power station.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] As a first aspect of the present invention, a pumped storage power station AVC substation analysis and evaluation system is provided, the system comprising:

[0009] The grid side includes the AVC master station system and grid dispatching;

[0010] The power plant side includes the pumped storage power station AVC substation and the AVC substation analysis and evaluation system;

[0011] The AVC master station system sends remote adjustment instructions to the AVC substation of the pumped storage power station through the dispatching data network, and the AVC substation of the pumped storage power station sends telemetry and telesignaling signals to the AVC master station system through the dispatching data network;

[0012] The pumped storage power station AVC substation of each pumped storage power station on the power plant side is connected to an AVC substation analysis and evaluation system; the AVC substation analysis and evaluation system collects data from the pumped storage power station AVC substation, generates analysis results after calculation and analysis by the AVC substation analysis and evaluation system, and submits the analysis results to the power grid dispatch on the power grid side.

[0013] As a preferred technical solution, the collected data includes: voltage or reactive power target value, AVC commissioning data, unit operating conditions, local voltage or reactive power operation curve, bus voltage, and unit reactive power operation history record;

[0014] For voltage or reactive power target value: when the AVC substation of the pumped storage power station is connected to the AVC master station system for closed-loop operation, the collected voltage or reactive power target value is the remote adjustment instruction issued by the master station; when the AVC substation of the pumped storage power station is operated on-site, the collected voltage or reactive power target value is the local regulation instruction;

[0015] The analysis results include: AVC operation rate, AVC control execution qualification rate, AVC lockout duration, AVC exit due to low excitation, over excitation, strong excitation, V / Hz action and other faults required by the dispatching agency, and the number of automatic AVC operation and shutdown due to operating conditions.

[0016] As a preferred technical solution, the analysis results generated by the power plant side are submitted to the grid dispatcher on the grid side as follows:

[0017] The AVC substation analysis and evaluation system directly submits the generated analysis results to the power grid dispatch;

[0018] Alternatively, on the power plant side, the AVC substation analysis and evaluation system sends the analysis results to the pumped storage power station AVC substation in the form of telemetering and telesignaling signals; the pumped storage power station AVC substation sends the analysis results to the grid-side AVC master station system in the form of telemetering and telesignaling signals through the dispatching data network; on the grid side, the grid dispatcher sets up corresponding telemetering point tables and telesignaling point tables in the AVC master station system as needed to check the analysis results sent by the pumped storage power station AVC substation.

[0019] As a preferred technical solution, the power grid side is also provided with an AVC operation analysis system master station, and the AVC substation analysis and evaluation system on the power plant side establishes a communication channel with the AVC operation analysis system master station via the dispatching data network, and sends the analysis results to the AVC operation analysis system master station on the power grid side via the dispatching data network;

[0020] The power grid dispatcher checks the analysis results sent by the AVC substation analysis and evaluation system from the AVC operation analysis system master station; and actively reads the operation data and historical records of the analysis results collected by the AVC substation analysis and evaluation system from the AVC substation of the pumped storage power station through the AVC operation analysis system master station.

[0021] Among them, the power grid dispatcher can directly view or view one or more of the analysis results at the AVC operation analysis system master station at the same time; the power grid dispatcher can actively access the operation data collected by the AVC substation analysis and evaluation system from one or more pumped storage power station AVC substations through the dispatching data network, and one or more of the analysis result historical records. As a second aspect of the present invention, a pumped storage power station AVC substation analysis and evaluation method is applied to the pumped storage power station AVC substation analysis and evaluation system as described above, and the steps include:

[0022] Based on the time that each unit of the pumped-storage power station on the power plant side enters the steady-state condition and the AVC operation time of each unit, the AVC operation rate of the unit in the power generation direction, the AVC operation rate of the unit in the pumping direction and the total AVC operation rate of the unit are calculated; wherein the steady-state condition includes power generation condition, power generation phase adjustment condition, pumping condition and pumping phase adjustment condition;

[0023] Taking the controlled bus voltage of the 500kV dispatching main station on the high-voltage side of the main transformer of the pumped-storage power station on the power plant side as the object, based on the proportion of the total regulation qualified points, the number of blocking points in the voltage increase direction and the number of blocking points in the voltage reduction direction in the total effective points of the AVC system voltage command execution, the 500kV bus voltage regulation qualified rate of the unit power generation direction AVC regulation, the unit pumping direction AVC regulation and the AVC total regulation when the AVC system of the unit in the station is put into operation is obtained.

[0024] As a preferred technical solution, the total AVC commissioning rate of the unit is expressed as:

[0025]

[0026] Among them, T all Indicates the total effective time, which is the total time for the unit to enter the steady-state condition; T avc-on-all Indicates the total AVC input time, which is the total AVC input time of each unit;

[0027] The AVC commissioning rate of the unit in the power generation direction is expressed as:

[0028]

[0029] Among them, T G-all Indicates the effective time of power generation direction, which is the total time for the unit to enter the steady state of power generation and power generation phase adjustment; T G-avc-on-all Indicates the AVC input time in the power generation direction, which is the total AVC input time of each unit during the steady-state power generation condition and power generation phase adjustment condition;

[0030] The AVC commissioning rate of the unit in the pumping direction is expressed as:

[0031]

[0032] Among them, T M-all Indicates the effective time of the pumping direction, which is the total time for the unit to enter the steady state of pumping condition and pumping phase adjustment condition; T M-avc-on-all It indicates the AVC input time in the pumping direction, which is the total AVC input time of each unit during the period when it enters the steady-state pumping condition and the pumping phase adjustment condition.

[0033] As a preferred technical solution, the 500kV bus voltage regulation qualification rate is calculated based on the voltage instruction execution interval set by the AVC system and the number of points executed by the target value per day, the regulation cycle and the regulation dead zone, where:

[0034] The total effective points are the sum of the points in which at least one unit AVC is in operation in each execution interval;

[0035] The total qualified points for regulation are the total points in the total valid points, where the absolute value of the 500kV voltage target value corresponding to each execution interval minus the 500kV voltage measured value corresponding to each regulation cycle is less than the total number of points in the regulation dead zone;

[0036] The number of locking points for the voltage increase direction is the sum of the number of points where the AVC of all the operating units is simultaneously in the magnetization increase locking state after each regulation cycle, after removing the total qualified points from the total valid points.

[0037] The number of locking points in the voltage reduction direction is the sum of the points in which the AVC of all operating units are simultaneously in demagnetization locking after each regulation cycle, after removing the total qualified points from the total valid points.

[0038] As a preferred technical solution, the AVC total adjustment pass rate is expressed as:

[0039]

[0040] Among them, λ all represents the total effective points, which is the sum of the points in which at least one unit AVC is in operation in each execution interval; λ q Indicates the total number of qualified points for regulation, which is the difference between the 500kV voltage target value corresponding to each execution interval and the 500kV voltage measured value corresponding to each regulation cycle in the total number of valid points, and the absolute value is less than the total number of points in the regulation dead zone; λ i Indicates the total number of blocking points in the direction of voltage increase, which is the sum of the points of all AVCs of the operating units in the direction of magnetization increase after each regulation cycle, after removing the total number of qualified points from the total number of valid points; λ r It indicates the total number of blocking points in the direction of total voltage reduction, which is the sum of the points in which the AVC of all operating units are simultaneously in demagnetization blocking after each regulation cycle, after removing the total qualified points for regulation from the total valid points.

[0041] As a preferred technical solution, the AVC regulation pass rate in the power generation direction is expressed as:

[0042]

[0043] Among them, the total number of effective points in the power generation direction λ G-all , is the sum of the points where the units in the station are in power generation condition or power generation phase adjustment condition in each execution interval, and at least one unit AVC is in operation; the total number of qualified points for power generation direction regulation λ G-q , is the difference between the 500kV voltage target value corresponding to each execution interval and the 500kV voltage measured value corresponding to each regulation cycle in the total effective points in the power generation direction, and the absolute value is less than the total number of points in the regulation dead zone; the total number of voltage direction locking points in the power generation direction λ G-i , is the sum of the points where all AVCs of all operating units are simultaneously in magnetization lockout after each regulation cycle, after removing the total qualified points in the power generation direction from the total effective points in the power generation direction; the total number of lockout points in the power generation direction for voltage reduction λ G-r , is the sum of the points in which the AVC of all operating units are simultaneously in demagnetization lockout after each regulation cycle, after removing the total qualified points for regulation in the power generation direction from the total valid points in the power generation direction.

[0044] As a preferred technical solution, the AVC regulation pass rate in the pumping direction is expressed as:

[0045]

[0046] Among them, the total number of effective points in the pumping direction λ M-all , is the sum of the points where the units in the station are in pumping condition or pumping phase adjustment condition and at least one unit AVC is in operation in each execution interval;

[0047] Total qualified points of pumping direction regulation λ M-q , is the subtraction of the 500kV voltage target value corresponding to each execution interval and the 500kV voltage measured value corresponding to each regulation cycle in the total effective points in the pumping direction, and the absolute value is less than the total number of points in the regulation dead zone;

[0048] Total increase in voltage in pumping direction λ M-i , is the sum of the points where the AVC of all the operating units are simultaneously in the magnetization lockout after each regulation cycle, after removing the total qualified points for regulation in the pumping direction from the total effective points in the pumping direction;

[0049] Total reduction voltage direction blocking points in pumping direction λ M-r , is the sum of the points in which the AVC of all the operating units are simultaneously in demagnetization lockout after each regulation cycle, after deducting the total qualified points for regulation in the pumping direction from the total valid points in the pumping direction.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] 1) The present invention is directed to an evaluation system for an AVC substation of a pumped-storage power station, which can collect information related to the AVC commissioning of the pumped-storage power station in real time, analyze and calculate the AVC input rate and the AVC qualified rate, and solve the problem of power grid dispatching for the assessment of the AVC substation system of the pumped-storage power station.

[0052] 2) The present invention is aimed at the evaluation system of the AVC substation of a pumped storage power station, points out the grid structure of the AVC substation analysis and evaluation system related to the AVC substation, AVC main station, and dispatching data network, and meets the needs of power grid dispatching for the AVC evaluation system.

[0053] 3) The system proposed in the present invention is suitable for analyzing the operation status of the AVC substation system of a pumped storage power station under two operation modes: closed-loop operation of the AVC main station and local closed-loop operation.

[0054] 4) In the system of the present invention, when the AVC master station system of the pumped storage power station does not have the analysis function, the operation analysis work of the AVC substation system can be completely completed by the substation side.

[0055] 5) The system of the present invention can communicate with the corresponding AVC analysis system master station, and the master station side can access the operation data and analysis result history records collected by the AVC substation analysis and evaluation system from any pumped storage power station AVC substation at any time. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a connection topology diagram of a first embodiment of an analysis and evaluation system for an AVC substation of a pumped storage power station provided by the present invention;

[0057] Figure 2 It is a connection topology diagram of a second embodiment of an analysis and evaluation system for an AVC substation of a pumped storage power station provided by the present invention;

[0058] Figure 3 It is a connection topology diagram of a third embodiment of an analysis and evaluation system for an AVC substation of a pumped storage power station provided by the present invention;

[0059] Figure 4 It is a schematic diagram of an analysis and evaluation system for an AVC substation of a pumped storage power station provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0060] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0061] Example 1

[0062] As one of the implementation modes of the present invention, this embodiment provides a method for evaluating the performance index of the operation commissioning rate of the AVC substation of a pumped storage power station, and analyzes and calculates the AVC commissioning rate and the AVC qualified rate to solve the problem of the power grid dispatching for the assessment of the AVC substation system of the pumped storage power station, which is as follows:

[0063] The AVC system operation rate is based on each unit of the pumped-storage power station on the power plant side. The operation rate of the AVC system is calculated when each unit enters four steady-state conditions (power generation condition, power generation phase adjustment condition, pumping condition, and pumping phase adjustment condition).

[0064] AVC commissioning rate time value and calculation method:

[0065] Total effective time: The total time that the unit enters the four steady-state conditions (generating condition, generating phase adjustment condition, pumping condition, and pumping phase adjustment condition), recorded as T all ;

[0066] Total AVC input time: Take the total AVC input time of each unit, recorded as T avc-on-all , then the total AVC commissioning rate of the unit is:

[0067]

[0068] Effective time in power generation direction: the total time for the unit to enter the steady state of power generation and power generation phase adjustment, recorded as T G-all ;

[0069] AVC input time in power generation direction: The total AVC input time of each unit during the steady-state power generation and power generation phase adjustment conditions is taken as T G-avc-on-all , then the AVC commissioning rate of the unit in the power generation direction is:

[0070]

[0071] Effective time of pumping direction: the total time of the unit entering the pumping condition and the pumping phase adjustment condition, recorded as T M-all ;

[0072] AVC input time in pumping direction: The total AVC input time of each unit during the period of entering the pumping condition and the pumping phase adjustment condition is recorded as T M-avc-on-all , then the AVC commissioning rate of the unit in the pumping direction is:

[0073]

[0074] A pumped storage power station AVC substation analysis and evaluation system and an AVC system operation regulation qualification rate performance index evaluation method of this embodiment are as follows:

[0075] The qualified rate of the AVC system is based on the controlled bus voltage of the 500kV dispatching main station on the high-voltage side of the main transformer of the pumped-storage power station on the power plant side. The qualified rate of the 500kV bus voltage regulation is calculated when the AVC system of the units in the station is put into operation.

[0076] AVC regulation pass rate selection points and calculation method:

[0077] The AVC system executes a voltage instruction every 5 minutes, that is, 288 target values ​​are executed every day, the control cycle is 3 minutes, and the control dead zone is 1kV.

[0078] Total effective points: In every 5 minutes, the sum of the points where at least one unit AVC is in operation in the station is taken, denoted as λ all ;

[0079] Total qualified points for regulation: In the total valid points, the 500kV voltage target value corresponding to each full 5 minutes is subtracted from the 500kV voltage measured value corresponding to each full 8 minutes, and the total number of points whose absolute value is less than 1kV is recorded as λ q ;

[0080] Total voltage increase direction blocking points: After removing the total qualified points from the total effective points, the sum of the points where all the AVCs of the operating units are simultaneously in the magnetization increase blocking state for every 8 minutes is recorded as λ i ;

[0081] Total voltage reduction direction blocking points: After removing the total qualified points from the total effective points, the sum of the points where all the AVCs of the operating units are simultaneously in the demagnetization blocking state for every 8 minutes is recorded as λ r , then the total AVC regulation pass rate is:

[0082]

[0083] Total effective points in the power generation direction: In every 5 minutes, the sum of the points where the units in the station are in power generation condition or power generation phase adjustment condition, and at least one unit AVC is in operation, is taken, and recorded as λ G-all ;

[0084] Total qualified points for power generation direction regulation: In the total valid points for power generation direction, the 500kV voltage target value corresponding to each full 5 minutes is subtracted from the 500kV voltage measured value corresponding to each full 8 minutes, and the total number of points whose absolute value is less than 1kV is recorded as λ G-q ;

[0085] Total voltage increase direction blocking points in the power generation direction: In the total effective points in the power generation direction, after removing the total qualified points in the power generation direction, the sum of the points where the AVC of all the operating units is simultaneously in the magnetization blocking every 8 minutes is recorded as λ G-i ;

[0086] Total number of blocking points for the total voltage reduction direction in the power generation direction: After removing the total qualified points for the power generation direction from the total valid points in the power generation direction, the sum of the points where the AVC of all the operating units is simultaneously in the demagnetization blocking state for every 8 minutes is recorded as λ G-r , then the AVC regulation qualification rate in the power generation direction is:

[0087]

[0088] Total effective points in the pumping direction: In every 5 minutes, take the sum of the points where the units in the station are in pumping condition or pumping phase adjustment condition, and at least one unit AVC is in operation, denoted as λ M-all ;

[0089] Total qualified points for pumping direction regulation: In the total valid points for pumping direction, the 500kV voltage target value corresponding to every 5 minutes is subtracted from the 500kV voltage measured value corresponding to every 8 minutes, and the total number of points whose absolute value is less than 1kV is recorded as λ M-q ;

[0090] Total increase voltage direction locking points in the pumping direction: In the total effective points in the pumping direction, after removing the total qualified points in the pumping direction, the sum of the points where the AVC of all the operating units is simultaneously in the increase magnetization locking every 8 minutes is recorded as λM-i ;

[0091] Total demagnetization direction blocking points in the pumping direction: After removing the total qualified points in the pumping direction from the total valid points in the pumping direction, the sum of the points where the AVC of all the operating units is simultaneously in demagnetization blocking every 8 minutes is recorded as λ M-r , then the AVC regulation qualification rate in the pumping direction is:

[0092]

[0093] Example 2

[0094] As attached Figure 1 This embodiment provides an analysis and evaluation system for the AVC substation of a pumped storage power station that implements the evaluation method described in the above embodiment, including three parts: a power grid side, a dispatching data network, and a power plant side;

[0095] The grid side includes: AVC master station system and grid dispatching;

[0096] The power plant side includes: pumped storage power station AVC substation and AVC substation analysis and evaluation system;

[0097] The AVC master station system on the grid side is connected to the AVC substations of each pumped storage power station on the power plant side through the dispatching data network;

[0098] Among them, each pumped storage power station on the power plant side is equipped with a pumped storage power station AVC substation; the pumped storage power station AVC substation is connected to the AVC substation analysis and evaluation system in a one-to-one correspondence, that is, the pumped storage power station AVC substation of each pumped storage power station on the power plant side is connected to an AVC substation analysis and evaluation system;

[0099] In the whole system, the AVC master station system on the power grid side establishes a two-way communication channel with the dispatching data network; the dispatching data network establishes a two-way communication channel with the pumped storage power station AVC substation on the power plant side; the pumped storage power station AVC substation establishes a one-way communication channel with the AVC substation analysis and evaluation system;

[0100] (1) From the AVC master station system on the power grid side to the AVC substation on the power plant side, the direction of the analysis and evaluation system:

[0101] ①AVC master station system to AVC substation of pumped storage power station

[0102] The AVC master station system sends remote control instructions to the AVC substation of the pumped storage power station through the dispatching data network, and the AVC substation of the pumped storage power station sends telemetry and telesignaling signals to the AVC master station system through the dispatching data network;

[0103] ②Analysis and evaluation system from AVC substation to AVC substation of pumped storage power station

[0104] The AVC substation analysis and evaluation system collects data from the AVC substation of the pumped storage power station, and generates analysis results after calculation and analysis by the AVC substation analysis and evaluation system;

[0105] The collected data include: voltage or reactive power target value, AVC commissioning data, unit operating conditions, local voltage or reactive power operation curve, bus voltage, unit reactive power operation history record, etc.

[0106] For voltage or reactive power target value: when the AVC substation of the pumped storage power station is connected to the AVC main station system for closed-loop operation, the collected voltage or reactive power target value is the remote adjustment instruction issued by the main station; when the AVC substation of the pumped storage power station is operated on-site, the collected voltage or reactive power target value is the local voltage or reactive power control instruction.

[0107] Among them, the analysis results include: AVC commissioning rate, AVC control execution qualification rate, AVC lockout duration, AVC exit due to faults (low excitation, over excitation, strong excitation, V / Hz action, etc.), and the number of automatic AVC commissioning and withdrawal due to operating conditions.

[0108] The analysis results can be in the form of a paper report or an electronic report.

[0109] (2) From the AVC substation analysis and evaluation system on the power plant side to the grid dispatch direction on the grid side

[0110] The pumped storage power station then submits the analysis results to the grid dispatcher on the grid side.

[0111] The system operation process is as follows:

[0112] The AVC master station system on the power grid side issues remote control instructions to the AVC substations of the pumped storage power station on the power plant side through the dispatching data network;

[0113] The AVC substation of the pumped storage power station can receive remote control instructions issued by the power grid dispatcher from the AVC master station system and execute the remote control instructions; it can also receive local control instructions and execute local control instructions;

[0114] The AVC substation analysis and evaluation system collects data from the AVC substation of the pumped storage power station for calculation and analysis, and generates analysis results;

[0115] The AVC substation of the pumped storage power station submits the analysis results to the grid dispatcher on the grid side;

[0116] The grid dispatcher checks the analysis results submitted from the pumped storage power station as needed.

[0117] Example 3

[0118] As attached Figure 2As shown, this embodiment is another implementation method of the AVC substation analysis and evaluation system of a pumped storage power station, including three parts: the power grid side, the dispatching data network, and the power plant side;

[0119] The grid side includes: AVC master station system and grid dispatching;

[0120] The power plant side includes: pumped storage power station AVC substation, AVC substation analysis and evaluation system;

[0121] Among them, each pumped storage power station on the power plant side is equipped with a pumped storage power station AVC substation, and the AVC master station system on the grid side is connected to the pumped storage power station AVC substation on the power plant side through the dispatching data network;

[0122] The AVC substations of the pumped-storage power station are connected to the AVC substation analysis and evaluation system in a one-to-one correspondence, that is, each pumped-storage power station AVC substation of the pumped-storage power station on the power plant side is connected to an AVC substation analysis and evaluation system.

[0123] In the entire system, the AVC master station system on the power grid side establishes a two-way communication channel with the dispatching data network; the dispatching data network establishes a two-way communication channel with the pumped storage power station AVC substation on the power plant side; and the pumped storage power station AVC substation establishes a two-way communication channel with the AVC substation analysis and evaluation system.

[0124] (1) From the AVC master station system on the power grid side to the AVC substation on the power plant side, the direction of the analysis and evaluation system:

[0125] ①AVC master station system to AVC substation of pumped storage power station:

[0126] The AVC master station system sends remote control instructions to the AVC substation of the pumped storage power station through the dispatching data network;

[0127] ②Analysis and evaluation system from AVC substation to AVC substation of pumped storage power station:

[0128] The AVC substation analysis and evaluation system collects data from the AVC substation of the pumped storage power station, and generates analysis results after calculation and analysis by the AVC substation analysis and evaluation system;

[0129] The collected data include: voltage or reactive power target value, AVC commissioning data, unit operating conditions, local voltage or reactive power operation curve, bus voltage, unit reactive power operation history record, etc.

[0130] For voltage or reactive power target value: when the AVC substation of the pumped-storage power station is connected to the AVC main station system for closed-loop operation, the collected voltage or reactive power target value is the remote adjustment instruction issued by the main station; when the AVC substation of the pumped-storage power station is operated on-site, the collected voltage or reactive power target value is the local control instruction.

[0131] Among them, the analysis results include: AVC commissioning rate, AVC control execution qualification rate, AVC lockout duration, AVC exit due to faults (low excitation, over excitation, strong excitation, V / Hz action, etc.), and the number of automatic AVC commissioning and withdrawal due to operating conditions.

[0132] (2) From the AVC substation analysis and evaluation system on the power plant side to the AVC master station system on the grid side:

[0133] ①AVC substation analysis and evaluation system to pumped storage power station AVC substation:

[0134] The AVC substation analysis and evaluation system sends the analysis results to the AVC substation of the pumped storage power station in the form of telemetry and telesignaling signals;

[0135] ② Pumped storage power station AVC substation to AVC main station system:

[0136] The AVC substation of the pumped storage power station sends the analysis results to the AVC master station system on the grid side in the form of telemetry and telesignaling signals through the dispatching data network;

[0137] (3) On the grid side, the AVC master station system and grid dispatching:

[0138] For power grid dispatching, the corresponding telemetry point table can be set in the AVC master station system as needed to check the analysis results sent by the AVC substation of the pumped storage power station;

[0139] For power grid dispatching, the corresponding remote signal point table can be set in the AVC master station system as needed to check the analysis results sent by the AVC substation of the pumped storage power station;

[0140] Among them, the power grid dispatcher can view one or more of the analysis results at the same time.

[0141] The system operation process is as follows:

[0142] The grid dispatch on the grid side issues remote dispatching instructions from the AVC master station system to the AVC substations of the pumped storage power station on the power plant side through the dispatching data network;

[0143] The AVC substation of the pumped storage power station can receive remote control instructions issued by the power grid dispatcher from the AVC master station system and execute the remote control instructions; it can also receive local control instructions and execute local control instructions;

[0144] The AVC substation analysis and evaluation system calculates and analyzes the relevant data collected from the AVC substation of the pumped storage power station and generates analysis results;

[0145] The AVC substation analysis and evaluation system sends the corresponding analysis results to the corresponding pumped storage power station AVC substation in the form of telemetry and telesignaling signals;

[0146] The AVC substations of the pumped storage power station send their corresponding analysis results to the AVC master station system on the power grid side in the form of telemetry and telesignaling signals through the dispatching data network;

[0147] The grid dispatcher checks the analysis results sent from the AVC substation of the pumped storage power station from the AVC master station system as needed.

[0148] Example 4

[0149] As attached Figure 3 , This embodiment provides a pumped storage power station AVC substation analysis and evaluation system, including three parts: power grid side, dispatching data network, and power plant side;

[0150] The power grid side includes: AVC master station system, AVC operation analysis system master station, and power grid dispatching;

[0151] The power plant side includes: pumped storage power station AVC substation, AVC substation analysis and evaluation system;

[0152] Among them, each pumped storage power station on the power plant side is equipped with a pumped storage power station AVC substation, and the AVC master station system on the power grid side is connected to each pumped storage power station AVC substation on the power plant side through the dispatching data network. The pumped storage power station AVC substation is connected to the AVC substation analysis and evaluation system one by one, that is, each pumped storage power station AVC substation of the pumped storage power station on the power plant side is connected to an AVC substation analysis and evaluation system; the AVC substation analysis and evaluation system on the power plant side is connected to the AVC operation analysis system master station on the power grid side.

[0153] In the whole system, the AVC master station system on the power grid side establishes a two-way communication channel with the dispatching data network; the dispatching data network establishes a two-way communication channel with the pumped storage power station AVC substation on the power plant side; the pumped storage power station AVC substation establishes a one-way communication channel with the AVC substation analysis and evaluation system;

[0154] The AVC substation analysis and evaluation system establishes a two-way communication channel with the AVC operation analysis system master station via the dispatching data network (a new communication channel is added);

[0155] (1) From the AVC master station system on the power grid side to the AVC substation on the power plant side, the direction of the analysis and evaluation system:

[0156] ①AVC master station system to AVC substation of pumped storage power station:

[0157] The AVC master station system sends remote control instructions to the AVC substation of the pumped storage power station through the dispatching data network;

[0158] Among them, the AVC substation of the pumped storage power station on the power plant side can also transmit data to the AVC master station system on the power grid side through telemetry of the dispatching data network.

[0159] ②Analysis and evaluation system from AVC substation to AVC substation of pumped storage power station:

[0160] The AVC substation analysis and evaluation system collects data from the AVC substation of the pumped storage power station, and generates analysis results after calculation and analysis by the AVC substation analysis and evaluation system;

[0161] The relevant data include: AVC commissioning data; unit operating conditions; local voltage or reactive power operating curves; bus voltage and unit reactive power operating history records, etc.

[0162] Among them, the analysis results include: AVC commissioning rate, AVC control execution qualification rate, AVC lockout duration, AVC exit due to faults (low excitation, over excitation, strong excitation, V / Hz action, etc.), and the number of automatic AVC commissioning and withdrawal due to operating conditions.

[0163] (2) From the AVC substation analysis and evaluation system on the power plant side to the main station of the AVC operation analysis system on the grid side:

[0164] The AVC substation analysis and evaluation system sends the analysis results to the AVC operation analysis system master station on the power grid side through the dispatching data network;

[0165] The analysis result may be in the form of a telemetry signal, a telesignaling signal, or other forms supported by the AVC operation analysis system master station.

[0166] (3) On the power grid side, the AVC operation analysis system master station and the power grid dispatcher:

[0167] For power grid dispatching, the analysis results sent by the AVC substation analysis and evaluation system can be viewed at the AVC operation analysis system master station;

[0168] The power grid dispatching can also actively extract the historical records of the AVC substation analysis and evaluation system through the AVC operation analysis system master station;

[0169] Among them, the power grid dispatcher can view one or more of the analysis results at the same time, and the power grid dispatcher can obtain one or more of the analysis results.

[0170] The system operation process is as follows:

[0171] The grid dispatch on the grid side issues remote dispatching instructions from the AVC master station system to the AVC substations of the pumped storage power station on the power plant side through the dispatching data network;

[0172] The AVC substation of the pumped storage power station can receive remote control instructions issued by the power grid dispatcher from the AVC master station system and execute the remote control instructions; it can also receive local control instructions and execute local control instructions;

[0173] The AVC substation analysis and evaluation system calculates and analyzes the relevant data collected from the AVC substation of the pumped storage power station and generates analysis results;

[0174] The AVC substation analysis and evaluation system sends the corresponding analysis results to the main station of the AVC operation analysis system on the power grid side;

[0175] The power grid dispatcher can check the analysis results sent by the AVC substation analysis and evaluation system from the AVC operation and analysis system master station as needed; the power grid dispatcher can also actively check the operation data and analysis result history records collected by the AVC substation analysis and evaluation system from the AVC substation of the pumped storage power station through the AVC operation and analysis system master station.

[0176] Example 5

[0177] like Figure 4 As shown, a pumped storage power station AVC substation analysis and evaluation system of this embodiment includes five parts: power supply system, operating system, clock system, communication system, and sampling system;

[0178] (1) Power supply system

[0179] The power supply system is equipped with dual power supply function modules; the power supply system supports positive and negative DC 110V direct current power supply; the power supply system supports AC220V alternating current power supply.

[0180] (2) Operating system

[0181] The operating system used is Linux.

[0182] (3) Clock system

[0183] The AVC substation analysis and evaluation system is configured with a clock synchronization function module: the clock system supports Beidou clock timing; the clock system supports GPS (B code) timing.

[0184] (4) Communication system

[0185] 1) Communication signal input: support IEC104 communication; support IEC61850 communication; support RS232 / 485 communication;

[0186] 2) Communication signal output adopts IEC104 communication.

[0187] (5) Sampling system

[0188] The AVC substation analysis and evaluation system is configured with a sampling function module: supports AC sampling; supports DC sampling.

[0189] The AVC substation analysis and evaluation system of a pumped storage power station of the present embodiment complies with industrial standards and does not include rotating instrument components (such as cooling fans, etc.).

[0190] A pumped storage power station AVC substation analysis and evaluation system of the present embodiment includes a storage function module for storing the above-mentioned data collected from the pumped storage power station AVC substation and the analysis results of the AVC substation analysis and evaluation system.

[0191] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A pumped storage power station AVC substation analysis and evaluation system, characterized in that: The system comprises: The grid side includes the AVC master station system and grid dispatching; The power plant side includes the pumped storage power station AVC substation and the AVC substation analysis and evaluation system; The AVC master station system sends remote adjustment instructions to the AVC substation of the pumped storage power station through the dispatching data network, and the AVC substation of the pumped storage power station sends telemetry and telesignaling signals to the AVC master station system through the dispatching data network; The pumped storage power station AVC substation of each pumped storage power station on the power plant side is connected to an AVC substation analysis and evaluation system; the AVC substation analysis and evaluation system collects data from the pumped storage power station AVC substation, generates analysis results after calculation and analysis by the AVC substation analysis and evaluation system, and submits the analysis results to the power grid dispatch on the power grid side.

2. A pumped storage power station AVC substation analysis and evaluation system according to claim 1, characterized in that: The collected data include: voltage or reactive power target value, AVC commissioning data, unit operating conditions, local voltage or reactive power operation curve, bus voltage, and unit reactive power operation history records; For voltage or reactive power target value: when the AVC substation of the pumped storage power station is connected to the AVC master station system for closed-loop operation, the collected voltage or reactive power target value is the remote adjustment instruction issued by the master station; when the AVC substation of the pumped storage power station is operated on-site, the collected voltage or reactive power target value is the local regulation instruction; The analysis results include: AVC operation rate, AVC control execution qualification rate, AVC locking time, AVC exit due to faults, and the number of automatic AVC operation and exit due to working conditions.

3. A pumped storage power station AVC substation analysis and evaluation system according to claim 1, characterized in that: Submitting the analysis results generated by the power plant side to the grid dispatcher on the grid side is specifically as follows: The AVC substation analysis and evaluation system directly submits the generated analysis results to the power grid dispatch; Alternatively, on the power plant side, the AVC substation analysis and evaluation system sends the analysis results to the pumped storage power station AVC substation in the form of telemetry and telesignaling signals; The AVC substation of the pumped-storage power station sends the analysis results in the form of telemetry and telesignaling signals to the AVC master station system on the grid side through the dispatching data network; on the grid side, the grid dispatcher sets up corresponding telemetry point tables and telesignaling point tables in the AVC master station system as needed to check the analysis results sent by the AVC substation of the pumped-storage power station.

4. A pumped storage power station AVC substation analysis and evaluation system according to claim 1, characterized in that: The power grid side is also provided with an AVC operation analysis system master station. The AVC substation analysis and evaluation system on the power plant side establishes a communication channel with the AVC operation analysis system master station via the dispatching data network, and sends the analysis results to the AVC operation analysis system master station on the power grid side via the dispatching data network. The power grid dispatcher checks the analysis results sent by the AVC substation analysis and evaluation system from the AVC operation analysis system master station; The AVC operation analysis system master station actively retrieves the operation data and historical records of analysis results collected from the AVC substation of the pumped storage power station by the AVC substation analysis and evaluation system.

5. A method for analyzing and evaluating an AVC substation of a pumped storage power station, characterized in that: The method is applied to the AVC substation analysis and evaluation system of a pumped storage power station as claimed in any one of claims 1 to 4, and the steps include: Based on the time that each unit of the pumped-storage power station on the power plant side enters the steady-state condition and the AVC operation time of each unit, the AVC operation rate of the unit in the power generation direction, the AVC operation rate of the unit in the pumping direction and the total AVC operation rate of the unit are calculated; wherein the steady-state condition includes power generation condition, power generation phase adjustment condition, pumping condition and pumping phase adjustment condition; Taking the controlled bus voltage of the 500kV dispatching main station on the high-voltage side of the main transformer of the pumped-storage power station on the power plant side as the object, based on the proportion of the total regulation qualified points, the number of blocking points in the voltage increase direction and the number of blocking points in the voltage reduction direction in the total effective points of the AVC system voltage command execution, the 500kV bus voltage regulation qualified rate of the unit power generation direction AVC regulation, the unit pumping direction AVC regulation and the AVC total regulation when the AVC system of the unit in the station is put into operation is obtained.

6. A method for analyzing and evaluating an AVC substation of a pumped storage power station according to claim 5, characterized in that: The total AVC commissioning rate of the unit is expressed as: Among them, T all Indicates the total effective time, which is the total time for the unit to enter the steady-state condition; T avc-on-all Indicates the total AVC input time, which is the total AVC input time of each unit; The AVC commissioning rate of the unit in the power generation direction is expressed as: Among them, T G-all Indicates the effective time of power generation direction, which is the total time for the unit to enter the steady state of power generation and power generation phase adjustment; T G-avc-on-all Indicates the AVC input time in the power generation direction, which is the total AVC input time of each unit during the steady-state power generation condition and power generation phase adjustment condition; The AVC commissioning rate of the unit in the pumping direction is expressed as: Among them, T M-all Indicates the effective time of the pumping direction, which is the total time for the unit to enter the steady state of pumping condition and pumping phase adjustment condition; T M-avc-on-all It indicates the AVC input time in the pumping direction, which is the total AVC input time of each unit during the period when it enters the steady-state pumping condition and the pumping phase adjustment condition.

7. A method for analyzing and evaluating an AVC substation of a pumped storage power station according to claim 5, characterized in that: The 500kV bus voltage regulation qualification rate is calculated based on the voltage instruction execution interval set by the AVC system, the number of points executed by the target value per day, the regulation cycle, and the regulation dead zone, where: The total effective points are the sum of the points in which at least one unit AVC is in operation in each execution interval; The total qualified points for regulation are the total points in the total valid points, where the absolute value of the 500kV voltage target value corresponding to each execution interval minus the 500kV voltage measured value corresponding to each regulation cycle is less than the total number of points in the regulation dead zone; The number of locking points for the voltage increase direction is the sum of the points where the AVC of all the operating units are simultaneously in the magnetization increase locking state after each regulation cycle, after removing the total qualified points from the total valid points. The number of locking points in the voltage reduction direction is the sum of the points in which the AVC of all operating units are simultaneously in demagnetization locking after each regulation cycle, after removing the total qualified points from the total valid points.

8. A method for analyzing and evaluating an AVC substation of a pumped storage power station according to claim 7, characterized in that: The AVC total adjustment pass rate is expressed as: Among them, λ all represents the total effective points, which is the sum of the points in which at least one unit AVC is in operation in each execution interval; λ q Indicates the total number of qualified points for regulation, which is the difference between the 500kV voltage target value corresponding to each execution interval and the 500kV voltage measured value corresponding to each regulation cycle in the total number of valid points, and the absolute value is less than the total number of points in the regulation dead zone; λ i Indicates the total number of blocking points in the direction of voltage increase, which is the sum of the points of all AVCs of the operating units in the direction of magnetization increase after each regulation cycle, after removing the total number of qualified points from the total number of valid points; λ r It indicates the total number of blocking points in the direction of total voltage reduction, which is the sum of the points in which the AVC of all operating units are simultaneously in demagnetization blocking after each regulation cycle, after removing the total qualified points for regulation from the total valid points.

9. A method for analyzing and evaluating an AVC substation of a pumped storage power station according to claim 7, characterized in that: The AVC regulation pass rate in the power generation direction is expressed as: Among them, the total number of effective points in the power generation direction λ G-all , is the sum of the points where the units in the station are in power generation condition or power generation phase adjustment condition in each execution interval, and at least one unit AVC is in operation; the total number of qualified points for power generation direction regulation λ G-q , is the difference between the 500kV voltage target value corresponding to each execution interval and the 500kV voltage measured value corresponding to each regulation cycle in the total effective points in the power generation direction, and the absolute value is less than the total number of points in the regulation dead zone; the total number of voltage direction locking points in the power generation direction λ G-i , is the sum of the points where all AVCs of all operating units are simultaneously in magnetization lockout after each regulation cycle, after removing the total qualified points in the power generation direction from the total effective points in the power generation direction; the total number of lockout points in the power generation direction for voltage reduction λ G-r , is the sum of the points in which the AVC of all operating units are simultaneously in demagnetization lockout after each regulation cycle, after removing the total qualified points for regulation in the power generation direction from the total valid points in the power generation direction.

10. A method for analyzing and evaluating an AVC substation of a pumped storage power station according to claim 5, characterized in that: The AVC regulation pass rate of the pumping direction is expressed as: Among them, the total number of effective points in the pumping direction λ M-all , is the sum of the points where the units in the station are in pumping condition or pumping phase adjustment condition and at least one unit AVC is in operation in each execution interval; Total qualified points of pumping direction regulation λ M-q , is the subtraction of the 500kV voltage target value corresponding to each execution interval and the 500kV voltage measured value corresponding to each regulation cycle in the total effective points in the pumping direction, and the absolute value is less than the total number of points in the regulation dead zone; Total increase in voltage in pumping direction λ M-i , is the sum of the points where the AVC of all the operating units are simultaneously in the magnetization lockout after each regulation cycle, after removing the total qualified points for regulation in the pumping direction from the total effective points in the pumping direction; Total reduction voltage direction blocking points in pumping direction λ M-r , is the sum of the points in which the AVC of all the operating units are simultaneously in demagnetization lockout after each regulation cycle, after deducting the total qualified points for regulation in the pumping direction from the total valid points in the pumping direction.

Images