AGC active power control method based on fire storage combined unit

Abstract

The invention discloses an AGC active control method based on a fire-storage combined unit, and the method comprises the steps: obtaining key information related to the fire-storage combined operation of a power plant based on the building of a fire-storage combined power control unit model, and carrying out the rationality inspection; based on adjustment characteristics and control strategy setting of the fire-storage combined power control unit, coordinated control over the fire-storage combined unit and the conventional unit is achieved; independent statistics and result display of unit regulation performance indexes are realized based on the performance test of the fire storage combined power control unit; on the basis of online statistics of regulation performance indexes of the fire storage combined power control unit, optimization of related performance indexes of the two methods and the frequency modulation auxiliary service market is achieved. According to fire storage combined power control, the AGC regulation performance of the generator set can be effectively improved, high-quality and efficient frequency modulation and peak regulation services are provided for a power grid, and safe and stable operation of the power grid is guaranteed.

Description

Technical Field

[0001] The invention relates to an AGC active power control method based on a thermal-storage combined unit, belonging to the technical field of power grid dispatching. Background Art

[0002] Increasing the proportion of new energy consumption, the power grid's rotational inertia continues to decrease, the regulation performance declines, the power grid has difficulty in peak and frequency regulation, and affects the safe and stable operation of the power grid. Therefore, without affecting the safe operation of the power plant system, the introduction of electric energy storage technology and units to jointly participate in frequency and peak regulation auxiliary services, and the joint thermal power units to carry out AGC frequency regulation business, effectively improve the AGC regulation performance of the generator set, provide high-quality and efficient frequency and peak regulation services for the power grid, and ensure the safe and stable operation of the power grid. Summary of the invention

[0003] The purpose of the present invention is to overcome the difficulties in the prior art and provide an AGC active power control method based on a combined thermal storage unit. According to the combined thermal storage power control, the AGC regulation performance of the generator set can be effectively improved, and high-quality and efficient frequency regulation and peak regulation services can be provided for the power grid to ensure safe and stable operation of the power grid. The AGC active power control method based on a combined thermal storage unit provided by the present invention includes online statistics of regulation performance indicators of the combined thermal storage power control unit, which can realize the optimization of the "two methods" and related performance indicators of the frequency regulation auxiliary service market.

[0004] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0005] A method for controlling active power based on AGC of a combined thermal and energy storage unit, characterized in that the control method specifically comprises the following steps:

[0006] Step S1: Establish a power control unit model based on thermal power plant combined with thermal power plant storage, obtain key information related to the thermal power plant combined with thermal power plant storage and conduct rationality inspection;

[0007] Step S2: Setting the regulation characteristics and control strategy of the power control unit based on the combination of thermal power generation and storage to achieve coordinated control of the thermal power generation and storage unit and the conventional unit;

[0008] Step S3: testing the performance index of the power control unit based on the combination of thermal power and storage power, and realizing independent statistics and result display of the unit regulation performance index;

[0009] Step S4: Online statistics of the regulation performance indicators of the power control units based on the combination of thermal power and storage are collected to optimize the performance indicators related to the frequency regulation auxiliary service market.

[0010] Preferably, the step S1 is specifically divided into the following steps:

[0011] Step S101: Establishing a power control unit model based on thermal power generation and storage combination;

[0012] Step S102: AGC supports real-time collection of the output of the thermal-storage combined unit;

[0013] Step S103: AGC monitors the information of the unit model, interacts with SCADA data at regular intervals, and obtains key information such as telemetry / telesignaling related to the combined operation of thermal power plant and power storage;

[0014] Step S104: Perform rationality check using real-time values / status.

[0015] Preferably, the unit regulation characteristics in step S2 specifically include: control parameters of the fire-storage PLC, AGC instruction update method, and power allocation strategy between units; wherein, the power allocation strategy between units includes an adjustment quantity allocation strategy and a fire-storage combined unit regulation power logic processing; the adjustment quantity allocation strategy includes a proportional sharing allocation strategy, an adjustment margin priority allocation strategy, a plan deviation priority allocation strategy and a manual priority allocation strategy; the fire-storage combined unit regulation power logic processing includes a control instruction response logic processing and a regulation power execution logic processing.

[0016] Preferably, the control strategy in step S2 specifically includes: setting of the combined unit control mode and setting of the control instruction cycle; wherein the combined unit control mode includes offline, local, automatic adjustment, no base point adjustment, no planned adjustment, and planned emergency adjustment; the control instruction cycle includes AGC instruction issuing cycle control and the output of the thermal storage combined unit entering the dead zone processing logic.

[0017] Preferably, the step S3 is specifically divided into the following steps:

[0018] Step S301: Perform AGC performance test, support dual power measurement points of thermal power unit and thermal power storage combined output; test tool grid-connected automatic test, including common test and continuous up / down test; wherein, the continuous up / down test is divided into first up then down test, first down then up test and multi-period continuous up / down test;

[0019] Step S302: realizing independent statistics of adjustment rate, adjustment accuracy and response delay based on relevant measurement and test instructions, and realizing real-time calculation of adjustment rate, adjustment accuracy and response delay;

[0020] Step S303: Track the curves of adjustment rate, adjustment accuracy and response delay and display the results.

[0021] Preferably, the step S302 is specifically divided into the following steps:

[0022] The step S3021: calculating the response delay;

[0023] Response delay refers to the difference between the time when the power generation unit starts to respond to the command and the time when the command is issued. The calculation formula is as follows:

[0024] T dely =T2-T1

[0025] Among them, T dely Delayed response of the power generation unit;

[0026] The step S3022: calculating the adjustment rate;

[0027] The regulation rate refers to the quotient of the effective action output and the effective regulation time of the power generation unit during the command regulation process. The unit is expressed as a percentage of the unit's rated capacity per minute. The calculation formula is as follows:

[0028]

[0029] Among them, R rate regulating the rate for the power generation unit;

[0030] The step S3023: calculating the adjustment accuracy;

[0031] The accuracy assessment adopts the rate-related adjustment accuracy, and the test calculation method is as follows:

[0032] Assume that the actual output of the unit at the i-th moment is R i , AGC instruction is C i , the rated output of the unit is P N ;

[0033] First, calculate Δt i The power that the unit should adjust within the time period ΔR i :

[0034]

[0035] Adjustment accuracy = MIN (target output that the unit should adjust within this time period - actual output);

[0036] If |C i -R i |≤ΔR i , then the AGC adjustment accuracy S at the end of the calculation period i+1 for:

[0037]

[0038] The unit of adjustment accuracy is: percentage of rated capacity;

[0039] The fundamental meaning of regulation accuracy is the degree of consistency between the actual output of the unit and the required adjustment position at the end of each AGC instruction;

[0040] If |C i -R i |>ΔR i , then judge C i With R i Size between:

[0041] If C i >R i , the corresponding AGC adjustment accuracy S i+1 for:

[0042]

[0043] If C i <R i , the corresponding AGC adjustment accuracy S i+1 for:

[0044]

[0045] The generator set AGC regulation accuracy assessment is calculated in hours, and the accuracy assessment is not calculated during the period when the AGC function is exited.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] The present invention provides an AGC active power control method for a combined thermal power unit. Based on the establishment of a combined thermal power unit model, key information related to the combined thermal power unit operation of a power plant is obtained and a rationality test is performed. Based on the regulation characteristics and control strategy settings of the combined thermal power unit, coordinated control of the combined thermal power unit and conventional units is achieved. Based on the performance test of the combined thermal power unit, independent statistics and result display of the regulation performance indicators of the unit are achieved. Based on the online statistics of the regulation performance indicators of the combined thermal power unit, the optimization of the "two methods" and related performance indicators of the frequency regulation auxiliary service market is achieved. Combined thermal power units can participate in frequency regulation and peak regulation control, which can effectively improve the AGC regulation performance of generator sets, provide high-quality and efficient frequency regulation and peak regulation services for the power grid, ensure the safe and stable operation of the power grid, and improve the new energy consumption capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a data interaction flow chart of an AGC active power control method based on a thermal-storage combined unit provided by an embodiment of the present invention.

[0049] Figure 2 It is a control flow chart of an AGC active power control method based on a thermal-storage combined unit provided by an embodiment of the present invention;

[0050] Figure 3It is a schematic diagram of the process of two consecutive adjustment instructions of the power generation unit independently counted in step S302 of the present invention;

[0051] Figure 4 It is a schematic diagram of a test calculation method for adjusting accuracy in step S3023 of the present invention. DETAILED DESCRIPTION

[0052] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0053] Embodiment 1:

[0054] like Figure 1 and 2 As shown, an embodiment of the present invention provides an AGC active power control method based on a thermal-storage combined unit, comprising:

[0055] Based on the establishment of the thermal-storage combined power control unit model, key information related to the thermal-storage combined operation of the power plant is obtained and rationality is tested;

[0056] Based on the regulation characteristics and control strategy setting of the combined power control unit of thermal power storage, the coordinated control of the combined power storage unit and the conventional unit is realized;

[0057] Based on the performance test of the thermal-storage combined power control unit, the independent statistics and result display of the unit regulation performance indicators are realized;

[0058] Based on the online statistics of the regulation performance indicators of the thermal-storage combined power control units, the optimization of the "two methods" and related performance indicators of the frequency regulation auxiliary service market is achieved.

[0059] Specific:

[0060] (1) Obtain key information related to the combined operation of thermal power plants and storage and conduct rationality checks; AGC supports real-time collection of combined thermal power output, model information of monitoring functions, regular interaction with SCADA data, acquisition of key information such as telemetry / telesignaling related to the combined operation of thermal power plants and storage, and rationality checks using real-time values / statuses.

[0061] (2) Comprehensively consider the regulation characteristics of the combined thermal power generation unit and the combined thermal power generation unit, and improve the control parameters of the thermal power generation PLC, the AGC instruction update method, and the power allocation strategy between units based on the output of the thermal power unit and the combined thermal power generation unit, so as to realize the coordinated control of the combined thermal power generation unit and the conventional units.

[0062] The control strategy of the combined thermal power unit includes the setting of the combined unit control mode and the setting of the control command cycle. The control modes include offline, local, automatic adjustment, base point non-adjustment, planned non-adjustment, planned emergency adjustment and other modes; the command control cycle includes AGC command issuance cycle control and the processing logic of the combined thermal power unit output entering the dead zone, which must follow the principle of avoiding frequent issuance of AGC control commands and avoiding over-adjustment.

[0063] The power allocation strategy between units includes the regulation quantity allocation strategy and the regulation power logic processing of the thermal storage combined unit. The regulation quantity allocation strategy includes the proportional sharing allocation strategy, the regulation margin priority allocation strategy, the plan deviation priority allocation strategy and the manual priority allocation strategy; the regulation power logic processing of the thermal storage combined unit includes the control instruction response logic processing and the regulation power execution logic processing.

[0064] (3) It supports AGC performance testing of dual power measurement points of single thermal power units and thermal power storage combined output, and realizes independent statistics, tracking curves and result display of regulation rate, regulation accuracy and response time based on relevant measurement and test instructions.

[0065] The test tool is an automatic grid-connected test, which includes common test and continuous rise and fall test. The continuous rise and fall test can be divided into a test strategy of rise first and then fall, a test strategy of fall first and then rise, and a continuous rise and fall test in multiple periods.

[0066] It can realize independent statistics of regulation rate, regulation accuracy and response time. The process of two consecutive regulation instructions of the power generation unit is as follows: Figure 3 As shown:

[0067] At time T1, the output of the power generation unit is P1. At this time, the control command is issued, and the target output is P4. After a response delay T dely After that, at T2, the power generation unit output reaches P2, and it is considered that the power generation unit begins to effectively respond to the control command, which is the starting point of the speed measurement. At T3, the actual output of the power generation unit reaches P3, and it reaches the target output dead zone for the first time. It is considered that the power generation unit responds to the control command and is the end point of the speed measurement. Enter the precision calculation time, and directly adjust the new control command value at T4. When the new command is issued, its actual output is P5, and the rated output of the unit is P N .

[0068] The calculation of the main performance indicators of the power generation unit response control command is as follows:

[0069] 1) Calculate response delay

[0070] Response delay refers to the difference between the time when the power generation unit starts to respond to the command and the time when the command is issued. Figure 1 As shown, the calculation formula is as follows:

[0071] T dely =T2-T1

[0072] Where T dely The response delay of the power generation unit.

[0073] 2) Calculate the adjustment rate

[0074] The regulation rate refers to the quotient of the effective action output and the effective regulation time of the power generation unit during the instruction regulation process, and the unit is the percentage of the unit's rated capacity / minute. Figure 1 As shown, the calculation formula is as follows:

[0075]

[0076] Where R rate Adjust the rate for the power generation unit.

[0077] 3) Calculate the regulation accuracy (the accuracy statistical dead zone is 0.5% of the rated capacity of the unit)

[0078] The accuracy assessment adopts the rate-related adjustment accuracy, and the test calculation method is as follows:

[0079] (a) Calculation method: Figure 4 As shown, the vertical axis is active power, the horizontal axis is time (unit: second), and each time the AGC sends a command corresponds to a scale on the horizontal axis.

[0080] Assume that the actual output of the unit at the i-th moment is R i , AGC instruction is C i , the rated output of the unit is P N ;

[0081] First, calculate Δt i The power that the unit should adjust within the time period ΔR i :

[0082]

[0083] Adjustment accuracy = MIN (target output that the unit should adjust within this time period - actual output);

[0084] If |C i -R i |≤ΔR i , then the AGC adjustment accuracy S at the end of the calculation period i+1 for:

[0085]

[0086] The unit of adjustment accuracy is: percentage of rated capacity;

[0087] The fundamental meaning of regulation accuracy is the degree of consistency between the actual output of the unit and the required adjustment position at the end of each AGC instruction;

[0088] If |C i -R i |>ΔR i , then judge C i With R i Size between:

[0089] If C i >R i , the corresponding AGC adjustment accuracy S i+1 for:

[0090]

[0091] If C i <R i , the corresponding AGC adjustment accuracy S i+1 for:

[0092]

[0093] The generator set AGC regulation accuracy assessment is calculated in hours, and the accuracy assessment is not calculated during the period when the AGC function is exited.

[0094] Based on the online statistics of the regulation performance indicators of the thermal-storage combined power control units, the optimization of the "two methods" and related performance indicators of the frequency regulation auxiliary service market is achieved.

[0095] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for controlling active power based on AGC of a combined thermal and storage unit, characterized in that: The control method specifically includes the following steps: Step S1: Establish a power control unit model based on thermal-storage combined operation, obtain key information related to the thermal-storage combined operation of the power plant and perform rationality verification; Step S2: Setting the regulation characteristics and control strategy of the power control unit based on the combined thermal power generation unit to achieve coordinated control of the combined thermal power generation unit and the conventional power generation unit; Step S3: Testing the performance indicators of the power control units based on the combined thermal and storage systems, and realizing independent statistics and result display of the unit regulation performance indicators; Step S4: Online statistics are collected on the regulation performance indicators of the power control units based on the combination of thermal power and storage power, so as to optimize the performance indicators related to the frequency regulation auxiliary service market.

2. The AGC active power control method based on a combined thermal and storage unit according to claim 1 is characterized in that: The step S1 is specifically divided into the following steps: Step S101: establishing a power control unit model based on thermal and storage combination; Step S102: AGC supports real-time collection of the output of the thermal-storage combined unit; Step S103: The AGC monitors the information of the unit model, periodically interacts with the SCADA data, and obtains key information such as telemetry / telesignaling related to the combined operation of thermal power and power storage in the power plant; Step S104: Perform rationality check using real-time values / status.

3. The AGC active power control method based on a combined thermal and storage unit according to claim 1 is characterized in that: The unit regulation characteristics in step S2 specifically include: control parameters of the thermal storage PLC, AGC instruction update method, and inter-unit power distribution strategy; wherein, the inter-unit power distribution strategy includes the regulation quantity distribution strategy and the thermal storage combined unit regulation power logic processing; the regulation quantity distribution strategy includes the proportional sharing distribution strategy, the regulation margin priority distribution strategy, the plan deviation priority distribution strategy and the manual priority distribution strategy; the thermal storage combined unit regulation power logic processing includes the control instruction response logic processing and the regulation power execution logic processing.

4. The AGC active power control method based on a combined thermal and storage unit according to claim 1 is characterized in that: The control strategy in step S2 specifically includes: setting the combined unit control mode and setting the control instruction cycle; wherein, the combined unit control mode includes offline, local, automatic adjustment, base point non-adjustment, planned non-adjustment, and planned emergency adjustment; the control instruction cycle includes AGC instruction issuance cycle control and thermal storage combined unit output entering dead zone processing logic.

5. The AGC active power control method based on a combined thermal and storage unit according to claim 1 is characterized in that: The step S3 is specifically divided into the following steps: Step S301: Perform AGC performance test, supporting dual power measurement points for single thermal power unit and combined thermal power storage output; the test tool performs automatic grid-connected testing, including normal testing and continuous up / down testing; wherein the continuous up / down testing is divided into a first up then down test, a first down then up test, and a multi-period continuous up / down test; Step S302: Implement independent statistics of the regulation rate, regulation accuracy, and response delay based on relevant measurement and test instructions, and implement real-time calculation of the regulation rate, regulation accuracy, and response delay; Step S303: Track the curves of the adjustment rate, adjustment accuracy, and response delay and display the results.

6. The AGC active power control method based on a combined thermal and storage unit according to claim 5, characterized in that: The step S302 is specifically divided into the following steps: The step S3021: calculating the response delay; Response delay refers to the difference between the time when the power generation unit starts to respond to the instruction and the time when the instruction is issued. The calculation formula is as follows: T dely =T2-T1 Among them, T dely Delayed response of the power generation unit; The step S3022: calculating the adjustment rate; The regulation rate refers to the quotient of the effective action output of the power generation unit during the instruction regulation process and the effective regulation time. The unit is expressed as a percentage of the unit's rated capacity per minute. The calculation formula is as follows: Among them, R rate regulating the rate for the power generation unit; The step S3023: calculating the adjustment accuracy; The accuracy assessment adopts rate-related regulation accuracy, and the test calculation method is as follows: Assume that the actual output of the unit at time i is R i , AGC instruction is C i , the rated output of the unit is P N ; First, calculate Δt i The power ΔR that the unit should adjust within the time period i : Adjustment accuracy = MIN (target output of the unit to be adjusted within this time period - actual output); If | C i -R i |≤ΔR i , then the AGC adjustment accuracy S at the end of the calculation period i+1 for: The unit of adjustment accuracy is: percentage of rated capacity; The fundamental meaning of regulation accuracy is the degree of consistency between the actual output of the unit and the required adjustment position at the end of each AGC instruction; If | C i -R i |>ΔR i , then judge C i With R i Size between: If C i >R i , the corresponding AGC adjustment accuracy S i+1 for: If C i <R i , the corresponding AGC adjustment accuracy S i+1 for: The AGC adjustment accuracy assessment of the generator set is calculated in hours, and the accuracy assessment is not calculated during the period when the AGC function is out of service.

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