A new energy station emergency state, dynamic and steady state active power coordinated control method

Abstract

The application discloses a new energy station emergency state, dynamic state and steady state active power coordinated control method, which sequentially judges the steady control emergency control instruction issuing state and the grid-connected line frequency starting identification bit state f start_flag , dynamic primary frequency modulation and steady state AGC coordinated parameter setting SET mod , calculates the new energy station active power coordinated control adjustment amount △P act ; SET mod includes dynamic primary frequency modulation latching steady state AGC, steady state AGC latching dynamic primary frequency modulation, steady state AGC and dynamic primary frequency modulation positive and negative direction superposition, steady state AGC and dynamic primary frequency modulation same direction superposition reverse latching dynamic primary frequency modulation and steady state AGC and dynamic primary frequency modulation same direction superposition reverse latching steady state AGC; the application realizes new energy station emergency state, dynamic state and steady state active power coordinated control, improves the safety and stability of large-scale new energy access to the power grid, and improves the active support capability of the new energy station.

Description

Technical Field

[0001] This invention relates to an active power coordination control method, particularly an emergency, dynamic, and steady-state active power coordination control method for renewable energy power plants. Background Technology

[0002] As the proportion of conventional power sources gradually decreases, it will be difficult to support the safe and stable operation of new power systems. Therefore, new energy sources should not only become the main source of power generation but also the main source of control for improving the transient and dynamic performance of the power grid, providing support for system power angle, frequency, and dynamic stability that is close to or higher than that provided by conventional power sources.

[0003] According to existing grid connection control requirements for new energy power plants, these plants need to have functions such as AGC (Automatic Generation Control), fast frequency response, and active power emergency control. Currently, most devices or systems with these functions are deployed independently. Although they meet the grid's performance requirements for peak shaving, frequency regulation, and active power emergency control, the functions are not effectively integrated. There is a lack of effective information exchange and functional coordination, making it difficult to achieve collaborative support control. When multiple functions are coupled for control, it is difficult to meet control requirements, affecting the safe and stable operation of the power grid. Summary of the Invention

[0004] Purpose of the invention: The purpose of this invention is to provide a comprehensive method for active power coordination control of grid connection of new energy power plants.

[0005] Technical solution: The emergency, dynamic, and steady-state active power coordinated control method for new energy power plants described in this invention, in each calculation cycle, sequentially determines the status of the emergency control command issuance and the status of the grid-connected line frequency start flag. start_flag Dynamic primary frequency regulation and steady-state AGC coordination parameter setpoint SET mod Calculate the active power coordination control adjustment amount △P of the new energy power station. act ;

[0006] The dynamic primary frequency modulation and steady-state AGC coordination parameter setpoint SET mod This includes dynamic primary frequency regulation with steady-state AGC, steady-state AGC with dynamic primary frequency regulation, steady-state AGC and dynamic primary frequency regulation superimposed in both directions, steady-state AGC and dynamic primary frequency regulation superimposed in the same direction with reverse blocking dynamic primary frequency regulation, and steady-state AGC and dynamic primary frequency regulation superimposed in the same direction with reverse blocking steady-state AGC.

[0007] Furthermore, if an emergency control order needs to be issued at this time, then △P act =P WK End of this cycle calculation, P WK To stabilize the emergency control command; otherwise, continue to monitor the current grid-connected line frequency start flag status f. start_flag ;

[0008] If fstart_flag If a start indicator is present, the dynamic primary frequency regulation and steady-state AGC coordination parameter setpoint SET will be used. mod Calculate △P act ;

[0009] Otherwise, if the steady-state AGC is in the AGC state... state For input, the active power coordination control adjustment amount △P of the new energy power station is obtained. act =P agc_new -P cur End the calculation for this cycle; if AGC state If no input is made, the settlement for this period ends; P agc_new The latest steady-state AGC instruction value, P cur To contribute to the current development of new energy power plants.

[0010] Furthermore, the setpoint SET based on the dynamic primary frequency modulation and steady-state AGC coordination parameters... mod Calculate △P act Includes: If SET mod For dynamic primary frequency modulation lockout steady-state AGC, the following steps are performed:

[0011] (31) If f start_flag In the initial startup state, the active electrical quantity P at startup time is... start =P cur If the condition is met, proceed to step (32); otherwise, proceed directly to step (32).

[0012] (32) If f start_flag If the startup state is low-frequency, then the theoretical adjustment amount ΔP for low frequency is... l The first correction and verification were performed to obtain the first adjustment correction value ΔP. _1 The ΔP _1 For ΔP l and the rated value of power increase of new energy power stations P up_set The smaller of the two values ​​is used to proceed to step (33);

[0013] If f start_flag In the high-frequency start-up state, the high-frequency theoretical adjustment amount ΔP is... h The first correction and verification were performed to obtain the first adjustment correction value ΔP. _1 The ΔP _1 For ΔP h and the rated value of power reduction for new energy power plants P down_set The smaller of the two values ​​is used to proceed to step (34);

[0014] (33) Regarding ΔP _1 The second verification yields the second adjustment correction value ΔP. _2 If P start With ΔP_1 The sum of these is greater than the rated installed capacity P of the new energy power station. N Then ΔP _2 =P start +ΔP _1 -P cur Otherwise ΔP _2 =P N -P cur Proceed to step (35);

[0015] (34) For ΔP _1 The second verification yields the second adjustment correction value ΔP. _2 If P start and ΔP _1 The difference is greater than the minimum output power limit setting P. min Then ΔP _2 =P cur -(P start -ΔP _1 Otherwise ΔP _2 =P cur -P min Proceed to step (35);

[0016] (35) If ΔP _2 The absolute value is greater than the minimum action threshold setpoint P for each round of control. min_set Then △P act =ΔP _2 Otherwise, no power adjustment is performed, i.e., ΔP act =0.

[0017] Furthermore, the setpoint SET based on the dynamic primary frequency modulation and steady-state AGC coordination parameters... mod Calculate △P act Includes: If SET mod For steady-state AGC lockout dynamic primary frequency regulation, then ΔP act =P agc_new -P cur .

[0018] Furthermore, the setpoint SET based on the dynamic primary frequency modulation and steady-state AGC coordination parameters... mod Calculate △P act Includes: If SET mod To ensure that steady-state AGC and dynamic primary frequency modulation are superimposed in both forward and reverse directions, the following steps are performed:

[0019] (51) If f start_flag In the initial startup state, the active electrical quantity P at startup time is... start =P agc_new If the condition is met, proceed to step (52); otherwise, proceed directly to step (52).

[0020] (52) If f start_flag If the startup state is low-frequency, then the theoretical adjustment amount ΔP for low frequency is... l The first correction and verification were performed to obtain the first adjustment correction value ΔP. _1 The ΔP _1 For ΔP l and the rated value of power increase of new energy power stations P up_set The smaller of the two values ​​is used to proceed to step (53);

[0021] If f start_flag In the high-frequency start-up state, the high-frequency theoretical adjustment amount ΔP is... h The first correction and verification were performed to obtain the first adjustment correction value ΔP. _1 The ΔP _1 For ΔP h and the rated value of power reduction for new energy power plants P down_set The smaller of the two values ​​is used to proceed to step (54);

[0022] (53) Regarding ΔP _1 The second verification yields the second adjustment correction value ΔP. _2 If P start With ΔP _1 The sum of these is greater than the rated installed capacity P of the new energy power station. N Then ΔP _2 =P start +ΔP _1 -P cur Otherwise ΔP _2 =P N -P cur Proceed to step (55);

[0023] (54) Regarding ΔP _1 The second verification yields the second adjustment correction value ΔP. _2 If P start and ΔP _1 The difference is greater than the minimum output power limit setting P. min Then ΔP _2 =P cur -(P start -ΔP _1 Otherwise ΔP _2 =P cur -P min Proceed to step (55);

[0024] (55) If ΔP _2 The absolute value is greater than the minimum action threshold setpoint P for each round of control. min_set Then △P act =ΔP _2Otherwise, no power adjustment is performed, i.e., ΔP act =0.

[0025] Furthermore, the setpoint SET based on the dynamic primary frequency modulation and steady-state AGC coordination parameters... mod Calculate △P act Includes: If SET mod To achieve steady-state AGC and dynamic primary frequency regulation in the same direction with reverse blocking, the following steps are performed for dynamic primary frequency regulation:

[0026] (61) If f start_flag In the initial startup state, the active electrical quantity P at startup time is... start =P cur The previous steady-state AGC plan value P agc_last =P start If the condition is met, proceed to step (62); otherwise, proceed directly to step (62).

[0027] (62) If f start_flag If it is in high-frequency start state, then proceed to step (65);

[0028] If f start_flag In the low-frequency start-up state, if there is a change in the steady-state AGC plan, proceed to step (63). If there is no change in the steady-state AGC plan and no blocking dynamic primary frequency regulation flag, the active power correction value P is given at the start-up time. start_1 Equal to the latest steady-state AGC command value P agc_new When the steady-state AGC plan remains unchanged and there is a lockout dynamic primary frequency regulation flag, no power regulation is performed, △P act =0;

[0029] (63) If the latest steady-state AGC plan value P agc_new Greater than the previous steady-state AGC planned value P agc_last Cancel the interlock for dynamic primary frequency regulation, and set the active power correction value P at startup. start_1 Equal to the latest steady-state AGC command value P agc_new Then proceed to step (64); otherwise, lock out dynamic primary frequency modulation, △P act =P agc_new -P cur ;

[0030] (64) The adjustment amount ΔP for low frequency theory. l The first correction and verification were performed to obtain the first adjustment correction value ΔP. _1 The ΔP _1 For ΔP l and the rated value of power increase of new energy power stations P up_set The smaller of the two; for ΔP _1The second verification yields the second adjustment correction value ΔP. _2 If there is an active power correction value P at startup start_1 With ΔP _1 The sum of these is greater than the rated installed capacity P of the new energy power station. N Then ΔP _2 =P start_1 +ΔP _1 -P cur Otherwise ΔP _2 =P N -P cur Proceed to step (68);

[0031] (65) When the steady-state AGC plan changes, proceed to step (66); when the steady-state AGC plan remains unchanged and there is no blocking dynamic primary frequency regulation flag, the active power correction value P is given at the start time. start_1 Equal to the latest steady-state AGC command value P agc_new Then proceed to step (67); when the steady-state AGC plan remains unchanged and there is a lockout dynamic primary frequency regulation flag, no power regulation is performed, i.e., ΔP. act =0;

[0032] (66) If the latest steady-state AGC command value P agc_new Less than the previous steady-state AGC planned value P agc_last Cancel the interlock for dynamic primary frequency regulation, and set the active power correction value P at startup. start_1 Equal to the latest steady-state AGC command value P agc_new Then proceed to step (67); otherwise, lock out dynamic primary frequency modulation, △P act =P agc_new -P cur ;

[0033] (67) Adjustment amount ΔP for high-frequency theory h The first correction and verification were performed to obtain the first adjustment correction value ΔP. _1 The ΔP _1 For ΔP h and the rated value of power reduction for new energy power plants P down_set The smaller of the two values, for ΔP _1 The second verification yields the second adjustment correction value ΔP. _2 ;

[0034] If P start and ΔP _1 The difference is greater than the minimum output power limit setting P. min Then ΔP _2 =P cur -(P start -ΔP _1 Otherwise ΔP _2 =Pcur -P min Proceed to step (68);

[0035] (68) If ΔP _2 The absolute value is greater than the minimum action threshold setpoint P for each round of control. min_set Then △P act =ΔP _2 Otherwise, no power adjustment is performed, i.e., ΔP act =0.

[0036] Furthermore, the setpoint SET based on the dynamic primary frequency modulation and steady-state AGC coordination parameters... mod Calculate △P act Includes: If SET mod To achieve a steady-state AGC and a dynamic primary frequency modulation superimposed in the same direction with a reverse-blocking steady-state AGC, the following steps are performed:

[0037] (71) If f start_flag In the initial startup state, the active electrical quantity P at startup time is... start =P cur The previous steady-state AGC plan value P agc_last =P start If f start_flag If it is not the first startup state, then P agc_last =P start_1 P start_1 The active power correction value at startup is set, proceed to step (72);

[0038] (72) If f start_flag In the low-frequency start-up state, then P start_1 Take the previous steady-state AGC plan value P agc_last and the latest steady-state AGC command value P agc_new The larger of the two values ​​corresponds to the low-frequency theoretical adjustment ΔP. l The first correction and verification were performed to obtain the first adjustment correction value ΔP. _1 ΔP _1 Take ΔP l and the rated value of power increase of new energy power stations P up_set The smaller of the two; proceed to step (73);

[0039] If f start_flag In the high-frequency start-up state, then P start_1 Take P agc_last and P agc_new The smaller of the two values ​​corresponds to the high-frequency theoretical adjustment ΔP. h The first correction check yields ΔP. _1 ΔP _1 Take ΔP h The power rating of the new energy power station will be limited to the rated value P.down_set The smaller of the two; proceed to step (74);

[0040] (73) Regarding ΔP _1 The second verification yields the second adjustment correction value ΔP. _2 If P start_1 With ΔP _1 The sum of these is greater than the rated installed capacity P of the new energy power station. N Then ΔP _2 =P start_1 +ΔP _1 -P cur Otherwise ΔP _2 =P N -P cur Proceed to step (75);

[0041] (74) Regarding ΔP _1 A second verification was performed to obtain ΔP. _2 If P start_1 With ΔP _1 The difference is greater than the minimum output power limit setting P. min Then ΔP _2 =P cur -(P start_1 -ΔP _1 Otherwise ΔP _2 =P cur -P min Proceed to step (75);

[0042] (75) If ΔP _2 The absolute value is greater than the minimum action threshold setpoint P for each round of control. min_set Then △P act =ΔP _2 Otherwise, no power adjustment is performed, i.e., ΔP act =0.

[0043] Furthermore, the low-frequency theoretical adjustment ΔP is calculated using a piecewise linear function of frequency and active power. l and the aforementioned high-frequency theoretical adjustment amount ΔP h ;

[0044]

[0045]

[0046] Among them, P N For the rated installed capacity of new energy power plants, f dl f is the frequency scrambling setpoint. N δ is the system's rated frequency. l f is the frequency scrambling droop rate. dhδ is the frequency up-disturbance setpoint. h This represents the frequency upscrambling modulation rate.

[0047] The electronic device of the present invention includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor. When the computer program is loaded into the processor, it implements the emergency, dynamic, and steady-state active power coordinated control method of the new energy power station.

[0048] The computer-readable storage medium of the present invention stores a computer program, which, when executed by a processor, implements the emergency, dynamic, and steady-state active power coordinated control method for new energy power plants.

[0049] Beneficial effects: Compared with the prior art, the advantages of this invention are: based on the emergency control instructions issued by the superior stability control system in the event of a power grid emergency, the dynamic support requirements of primary frequency regulation, and the steady-state instructions of the dispatch AGC, the active power coordination control adjustment amount of the new energy power station is obtained through coordinated calculation, thereby realizing the emergency, dynamic, and steady-state active power coordination control of the new energy power station, improving the safety and stability of large-scale new energy access to the power grid, and enhancing the active support capability of the new energy power station. Attached Figure Description

[0050] Figure 1 This is a flowchart of the active power coordination control method of the present invention.

[0051] Figure 2 The flowchart of dynamic primary frequency modulation lockout steady-state AGC in this embodiment of the invention.

[0052] Figure 3 The flowchart of the steady-state AGC and dynamic primary frequency modulation in both forward and reverse directions in the embodiments of the present invention is shown.

[0053] Figure 4 The flowchart of steady-state AGC and dynamic primary frequency modulation superimposed in the same direction and reversed blocking in dynamic primary frequency modulation in this embodiment of the invention.

[0054] Figure 5 The flowchart of steady-state AGC and dynamic primary frequency modulation superimposed in the same direction with reverse blocking steady-state AGC in this embodiment of the invention. Detailed Implementation

[0055] The technical solution of the present invention will be further described below with reference to the accompanying drawings. The present invention, taking into account the performance requirements of the power grid for peak shaving, frequency regulation, and active power emergency control, first calculates the active power coordination control adjustment amount for new energy power plants based on the active power emergency control requirements. When there is no active power emergency control command, the active power coordination control adjustment amount for new energy power plants is obtained according to the following coordination relationships: dynamic primary frequency regulation blocking steady-state AGC, steady-state AGC and dynamic primary frequency regulation being superimposed in both forward and reverse directions, steady-state AGC and dynamic primary frequency regulation being superimposed in the same direction and then blocking dynamic primary frequency regulation, and steady-state AGC and dynamic primary frequency regulation being superimposed in the same direction and then blocking steady-state AGC.

[0056] like Figure 1 As shown, the emergency, dynamic, and steady-state active power coordinated control method for new energy power stations according to the present invention includes the following steps:

[0057] Step A: At the start of this cycle, acquire the status of the emergency control command issuance and the emergency control command P. WK Grid connection line frequency start flag status f start_flag The current output of new energy power plants is P cur Current grid connection frequency f, steady-state AGC on / off status. state The latest steady-state AGC instruction value P agc_new Dynamic primary frequency regulation and steady-state AGC coordination parameter setpoint SET mode .

[0058] Step B: If an emergency control command is required, the active power coordination and control adjustment amount △P of the new energy power station is obtained. act =Stabilization and Emergency Control Command P WK If the current cycle calculation ends, proceed to step C; otherwise, proceed to step C.

[0059] Step C: Detect the current grid-connected line frequency start flag status f start_flag If f start_flag If a start flag is present, proceed to step D; otherwise, if the steady-state AGC is in the AGC enable / disable state... state For input, the active power coordination control adjustment amount △P of the new energy power station is obtained. act =P agc_new -P cur This concludes the calculation for this cycle.

[0060] Step D: If the dynamic primary frequency regulation and steady-state AGC coordination parameter setpoint SET mod When the dynamic primary frequency regulation is locked in steady-state AGC, the active power coordination control adjustment ΔP of the renewable energy power plant is obtained through the dynamic primary frequency regulation control process. act If the current cycle calculation ends, proceed to step E; otherwise, proceed to step E.

[0061] Step E: If SET modWhen the steady-state AGC is locked and the dynamic primary frequency regulation is applied, the active power coordination control adjustment amount ΔP of the new energy power station is obtained. act =P agc_new -P cur If the current cycle calculation ends, proceed to step F; otherwise, proceed to step F.

[0062] Step F: If SET mod When steady-state AGC and dynamic primary frequency regulation are superimposed in both forward and reverse directions, the active power coordination control adjustment amount ΔP of the renewable energy power station is obtained through the process of superimposing steady-state AGC and dynamic primary frequency regulation in both forward and reverse directions. act If the current cycle calculation ends, proceed to step G; otherwise, proceed to step G.

[0063] Step G: If SET mod To achieve a dynamic primary frequency regulation system that is superimposed in the same direction and then blocked in the opposite direction, the active power coordinated control adjustment amount ΔP of the renewable energy power plant is obtained through the process of superimposing the steady-state AGC and the dynamic primary frequency regulation system in the same direction and then blocking in the opposite direction. act If the current cycle calculation ends, proceed to step H; otherwise, proceed to step H.

[0064] Step H: If the value is SET mod To obtain the active power coordinated control adjustment ΔP of the renewable energy power plant by superimposing steady-state AGC and dynamic primary frequency regulation in the same direction with reverse-blocking steady-state AGC, the following process is used: act If the current cycle calculation ends, proceed to step I; otherwise, proceed to step I.

[0065] Step I: End the calculation for this cycle and begin the next cycle by repeating steps A through H.

[0066] Figure 2 The diagram shown is a flowchart of the dynamic primary frequency modulation lockout steady-state AGC in this embodiment, which is the SET in step D above. mod When performing dynamic primary frequency regulation with lockout steady-state AGC, the dynamic primary frequency regulation control process obtains the active power coordination control adjustment ΔP of the renewable energy power plant. act The process, specifically the steps, are as follows:

[0067] D.1: Determine the status of the frequency start flag f start_flag If this is the first startup (i.e., the startup flag was absent in the previous calculation period, but has a startup flag in the current period), then the active electrical quantity P is present at the startup time. start Equal to the current output P of the new energy power station cur Proceed to step D.2; otherwise, proceed directly to step D.2.

[0068] D.2: If f start_flag In low-frequency startup state, proceed to step D.3; if f start_flag The system is in a high-frequency startup state; proceed to step D.6.

[0069] D.3: Calculate the theoretical adjustment amount for low frequency using a piecewise linear function of frequency and active power. P N For the rated installed capacity of new energy power plants, f dl f is the frequency scrambling setpoint. N δ is the system's rated frequency. l The frequency scrambling modulation rate; proceed to step D.4;

[0070] D.4: Low-frequency theoretical adjustment amount ΔP l The first correction and verification were performed to obtain the first adjustment correction value ΔP. _1 ΔP _1 Take the low-frequency theoretical adjustment amount ΔP l and the rated value of power increase of new energy power stations P up_set The smaller of the two; proceed to step D.5;

[0071] D.5: Adjust the correction value ΔP for the first time. _1 The second verification yields the second adjustment correction value ΔP. _2 If the active electrical quantity P is present at startup start Compared with the first adjustment correction value ΔP _1 The sum of these is greater than the rated installed capacity P of the new energy power station. N Then ΔP _2 =P start +ΔP _1 -P cur Otherwise ΔP _2 =P N -P cur Proceed to step D.9;

[0072] D.6: Calculate the theoretical adjustment amount for high frequency using a piecewise linear function of frequency and active power. f dh δ is the frequency up-disturbance setpoint. h Frequency upscrambling modulation rate; proceed to step D.7;

[0073] D.7: High-frequency theoretical adjustment amount ΔP h The first correction and verification were performed to obtain the first adjustment correction value ΔP. _1 ΔP _1 Take the high-frequency theoretical adjustment amount ΔP h The power rating of the new energy power station will be limited to the rated value P. down_set The smaller of the two; proceed to step D.8;

[0074] D.8: Adjust the correction value ΔP for the first time. _1 The second verification yields the second adjustment correction value ΔP. _2If the active electrical quantity P at startup start And the first adjustment of the correction value ΔP _1 The difference is greater than the minimum output power limit setting P. min Then ΔP _2 =P cur -(P start -ΔP _1 Otherwise ΔP _2 =P cur -P min Proceed to step D.9;

[0075] D.9: If the correction value ΔP is adjusted for the second time _2 The absolute value is greater than the minimum motion threshold setpoint P for each round of control. min_set The adjustment amount △P for active power coordination control of new energy power plants. act =ΔP _2 If not, then no power adjustment is performed, i.e., ΔP. act =0, step D is complete.

[0076] Figure 3 The diagram shown is a flowchart of the superposition of steady-state AGC and dynamic primary frequency modulation in both forward and reverse directions in this embodiment, which is the SET in step F above. mod When steady-state AGC and dynamic primary frequency regulation are superimposed in both forward and reverse directions, the superposition process of steady-state AGC and dynamic primary frequency regulation in both forward and reverse directions yields the active power coordinated control adjustment amount ΔP of the new energy power station. act The process, specifically the steps, are as follows:

[0077] F.1: Determine the status of the frequency start flag. start_flag If this is the first startup (i.e., the startup flag was absent in the previous calculation period, but has a startup flag in the current period), then the active electrical quantity P is present at the startup time. start The latest steady-state AGC command value P agc_new If yes, proceed to step F.2; otherwise, proceed directly to step F.2.

[0078] F.2: If f start_flag If the startup state is low frequency, proceed to step F.3; if f start_flag In high-frequency startup mode, proceed to step F.6;

[0079] F.3: Calculate the theoretical adjustment amount for low frequency using a piecewise linear function of frequency and active power. Proceed to step F.4;

[0080] F.4: Low-frequency theoretical adjustment amount ΔP l The first correction and verification were performed to obtain the first adjustment correction value ΔP. _1 ΔP _1 Take the low-frequency theoretical adjustment amount ΔP land the rated value of power increase of new energy power stations P up_set The smaller value between the two is used to proceed to step F.5;

[0081] F.5: Adjust the correction value ΔP for the first time. _1 The second verification yields the second adjustment correction value ΔP. _2 If the active electrical quantity P at startup start And the first adjustment of the correction value ΔP _1 The sum of these is greater than the rated installed capacity P of the new energy power station. N ΔP _2 =P start +ΔP _1 -P cur Otherwise ΔP _2 =P N -P cur Proceed to step F.9;

[0082] F.6: Calculate the theoretical adjustment amount for high frequency using a piecewise linear function of frequency and active power. Proceed to step F.7;

[0083] F.7: High-frequency theoretical adjustment amount ΔP h The first correction and verification were performed to obtain the first adjustment correction value ΔP. _1 ΔP _1 Take the high-frequency theoretical adjustment amount ΔP h The power rating of the new energy power station will be limited to the rated value P. down_set The smaller of the two; proceed to step F.8;

[0084] F.8: Adjust the correction value ΔP for the first time. _1 The second verification yields the second adjustment correction value ΔP. _2 If the active electrical quantity P is present at startup... start And the first adjustment of the correction value ΔP _1 The difference is greater than the minimum output power limit setting P. min Then ΔP _2 =P cur -(P start -ΔP _1 Otherwise ΔP _2 =P cur -P min Proceed to step F.9;

[0085] F.9: If the correction value ΔP is adjusted for the second time _2 The absolute value is greater than the minimum motion threshold setpoint P for each round of control. min_set The adjustment amount △P for active power coordination control of new energy power plants. act =ΔP _2 Otherwise, no power adjustment is performed, i.e., ΔP.act =0, step F is complete.

[0086] Figure 4 The diagram shown is a flowchart of the dynamic primary frequency regulation process in this embodiment, which involves the superposition of steady-state AGC and dynamic primary frequency regulation in the same direction with reverse blocking. This is the SET step in step G above. mod When steady-state AGC and dynamic primary frequency regulation are superimposed in the same direction and blocked in the opposite direction during dynamic primary frequency regulation, the dynamic primary frequency regulation process of steady-state AGC and dynamic primary frequency regulation being superimposed in the same direction and blocked in the opposite direction yields the active power coordinated control adjustment amount ΔP of the new energy power station. act The process, specifically the steps, are as follows:

[0087] G.1: Determine the status of the frequency start flag f start_flag If this is the first startup (i.e., the startup flag was absent in the previous calculation cycle, but has a startup flag in the current cycle), then the active power P is present at the startup time. start For the current active power contribution of the new energy power station P cur The previous steady-state AGC plan value P agc_last equals P start If yes, proceed to step G.2; otherwise, proceed directly to step G.2.

[0088] G.2: If f start_flag In high-frequency startup state, proceed to step G.7; if f start_flag In the low-frequency start-up state, if the steady-state AGC plan changes, proceed to step G.3. If the steady-state AGC plan remains unchanged and there is no blocking dynamic primary frequency regulation flag, the active power correction value P is set at the start-up time. start_1 Equal to the latest steady-state AGC command value P agc_new Then proceed to step G.4. If the steady-state AGC plan remains unchanged and there is a lockout dynamic primary frequency regulation flag, no power regulation will be performed, i.e., ΔP. act =0 and end process G;

[0089] G.3: If the latest steady-state AGC plan value P agc_new Greater than the previous steady-state AGC planned value P agc_last Cancel the interlock for dynamic primary frequency regulation, and set the active power correction value P at startup. start_1 Equal to the latest steady-state AGC command value P agc_new Then proceed to step G.4; otherwise, lock out dynamic primary frequency regulation and calculate the active power coordination control adjustment ΔP of the new energy power station. act =P agc_new -P cur And end process G;

[0090] G.4: Calculate the theoretical adjustment amount for low frequency using a piecewise linear function of frequency and active power. Proceed to step G.5;

[0091] G.5: Low-frequency theoretical adjustment amount ΔP l The first correction and verification were performed to obtain the first adjustment correction value ΔP. _1 ΔP _1 Take the low-frequency theoretical adjustment amount ΔP l and the rated value of power increase of new energy power stations P up_set The smaller of the two values ​​proceeds to step G.6;

[0092] G.6: Adjust the correction value ΔP for the first time. _1 The second verification yields the second adjustment correction value ΔP. _2 If there is an active power correction value P at startup start_1 And the first adjustment of the correction value ΔP _1 The sum of these is greater than the rated installed capacity P of the new energy power station. N Then ΔP _2 =P start_1 +ΔP _1 -P cur Otherwise ΔP _2 =P N -P cur Proceed to step G.12;

[0093] G.7: During high-frequency startup, if the steady-state AGC plan changes, proceed to step G.8. If the steady-state AGC plan remains unchanged and there is no blocking dynamic primary frequency regulation flag, the active power correction value P at the startup time is set. start_1 Equal to the latest steady-state AGC command value P agc_new Then proceed to step G.9. If the steady-state AGC plan remains unchanged and there is a lockout dynamic primary frequency regulation flag, no power regulation will be performed, i.e., ΔP. act =0 and end process G;

[0094] G.8: If the latest steady-state AGC instruction value P agc_new Less than the previous steady-state AGC planned value P agc_last Cancel the interlock for dynamic primary frequency regulation, and set the active power correction value P at startup. start_1 Equal to the latest steady-state AGC command value P agc_new Then proceed to step G.9; otherwise, lock out dynamic primary frequency regulation and calculate the active power coordination control adjustment ΔP of the new energy power station. act =P agc_new -P cur And end process G;

[0095] G.9: Calculate the theoretical adjustment amount for high frequency using a piecewise linear function of frequency and active power. Proceed to step G.10;

[0096] G.10: High-frequency theoretical adjustment amount ΔP hThe first correction and verification were performed to obtain the first adjustment correction value ΔP. _1 ΔP _1 Take the high-frequency theoretical adjustment amount ΔP h The power rating of the new energy power station will be limited to the rated value P. down_set The smaller value between the two is used to proceed to step G.11;

[0097] G.11: Adjust the correction value ΔP for the first time. _1 The second verification yields the second adjustment correction value ΔP. _2 If there is an active power correction value P at startup start_1 And the first adjustment of the correction value ΔP _1 The difference is greater than the minimum output power limit setting P. min Then ΔP _2 =P cur -(P start_1 -ΔP _1 Otherwise ΔP _2 =P cur -P min Proceed to step G.12;

[0098] G.12: If the correction value ΔP is adjusted for the second time _2 The absolute value is greater than the minimum motion threshold setpoint P for each round of control. min_set The adjustment amount △P for active power coordination control of new energy power plants. act =ΔP _2 Otherwise, no power adjustment is performed, i.e., ΔP. act =0, step G is complete.

[0099] Figure 5 The diagram shown is a flowchart of steady-state AGC and dynamic primary frequency modulation superimposed in the same direction with reverse blocking steady-state AGC in this embodiment, which is the SET in step H above. mod When steady-state AGC and dynamic primary frequency regulation are superimposed in the same direction with reverse-blocking steady-state AGC, the process of superimposing steady-state AGC and dynamic primary frequency regulation in the same direction with reverse-blocking steady-state AGC yields the active power coordinated control adjustment amount ΔP of the new energy power station. act The process, specifically the steps, are as follows:

[0100] H.1: Determine the status of the frequency start flag bit f start_flag If this is the first startup (i.e., the startup flag was absent in the previous calculation cycle, but has a startup flag in the current cycle), then the active power P is present at the startup time. start For the current output of new energy power plants P cur The previous steady-state AGC plan value P agc_last equals P start Otherwise, the previous steady-state AGC planned value P agc_last Equal to the active power correction value P at startupstart_1 Proceed to step H.2;

[0101] H.2: If the startup flag is in low-frequency startup state, proceed to step H.3; if the startup flag is in high-frequency startup state, proceed to step H.6.

[0102] H.3: Calculate the active power correction value P at startup. start_1 P start_1 Take the previous steady-state AGC plan value P agc_last and the latest steady-state AGC command value P agc_new The larger of the two values; the theoretical adjustment amount for low frequency is calculated using a piecewise linear function of frequency and active power. Proceed to step H.4;

[0103] H.4: Low-frequency theoretical adjustment amount ΔP l The first correction and verification were performed to obtain the first adjustment correction value ΔP. _1 ΔP _1 Take the low-frequency theoretical adjustment amount ΔP l and the rated value of power increase of new energy power stations P up_set The smaller of the two values ​​proceeds to step H.5;

[0104] H.5: Adjusting the correction value ΔP for the first time _1 The second verification yields the second adjustment correction value ΔP. _2 If there is an active power correction value P at startup start_1 And the first adjustment of the correction value ΔP _1 The sum of these is greater than the rated installed capacity P of the new energy power station. N Then ΔP _2 =P start_1 +ΔP _1 -P cur Otherwise ΔP _2 =P N -P cur Proceed to step H.9;

[0105] H.6: Calculate the active power correction value P at startup. start_1 P start_1 Take the previous steady-state AGC plan value P agc_last And the latest steady-state AGC plan value P agc_new The smaller of the two; the theoretical adjustment amount for high frequency is calculated using a piecewise linear function of frequency and active power. Proceed to step H.7;

[0106] H.7: High-frequency theoretical adjustment amount ΔP h The first correction and verification were performed to obtain the first adjustment correction value ΔP. _1 ΔP _1Take the high-frequency theoretical adjustment amount ΔP h The power rating of the new energy power station will be limited to the rated value P. down_set The smaller of the two values ​​proceeds to step H.8;

[0107] H.8: Adjusting the correction value ΔP for the first time _1 The second verification yields the second adjustment correction value ΔP. _2 If there is an active power correction value P at startup... start_1 And the first adjustment of the correction value ΔP _1 The difference is greater than the minimum output power limit setting P. min Then ΔP _2 =P cur -(P start_1 -ΔP _1 Otherwise ΔP _2 =P cur -P min Proceed to step H.9;

[0108] H.9: If the correction value ΔP is adjusted for the second time... _2 The absolute value is greater than the minimum motion threshold setpoint P for each round of control. min_set The adjustment amount △P for active power coordination control of new energy power plants. act =ΔP _2 Otherwise, no power adjustment is performed, i.e., ΔP. act =0, step H is complete.

[0109] The electronic device of the present invention includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor. When the computer program is loaded into the processor, it implements the emergency, dynamic, and steady-state active power coordinated control method of the new energy power station.

[0110] The computer-readable storage medium of the present invention stores a computer program, which, when executed by a processor, implements the emergency, dynamic, and steady-state active power coordinated control method for new energy power plants.

[0111] The computer-readable storage medium described in this invention may include RAM, ROM, EEPROM, CD-ROM or other optical disc storage devices, magnetic disk storage devices or other magnetic storage devices, flash memory, or any other medium that can be used to store desired program code in the form of instructions or data structures and is accessible by a computer.

[0112] The processor is used to execute a computer program stored in memory to implement the various steps in the methods described in the above embodiments.

Claims

1. A method for coordinated control of emergency, dynamic, and steady-state active power in a new energy power station, characterized in that, In each calculation cycle, the status of the emergency control command for stability control and the status of the grid-connected line frequency start flag are checked sequentially. Dynamic primary frequency regulation and steady-state AGC coordination parameter setting Calculate the active power coordination control adjustment of new energy power plants. ; The dynamic primary frequency regulation and steady-state AGC coordination parameter setting This includes dynamic primary frequency modulation blocking steady-state AGC, steady-state AGC blocking dynamic primary frequency modulation, steady-state AGC and dynamic primary frequency modulation superimposed in both forward and reverse directions, steady-state AGC and dynamic primary frequency modulation superimposed in the same direction and blocking dynamic primary frequency modulation in the opposite direction, and steady-state AGC and dynamic primary frequency modulation superimposed in the same direction and blocking steady-state AGC in the opposite direction. If an emergency control order needs to be issued at this time, then End of this calculation cycle. Emergency control commands will be issued to ensure stability; otherwise, the status of the frequency activation flag of the current grid-connected line will continue to be monitored. ; like If a start indicator is present, the setpoint is determined based on the coordination parameters of dynamic primary frequency regulation and steady-state AGC. calculate ; Otherwise, if the steady-state AGC is in a state of engagement or disengagement. For input, the active power coordination control adjustment amount of the new energy power station is obtained. End the calculation for this period; if If no input is made, the settlement for this period ends. This is the latest steady-state AGC instruction value. To contribute to the current development of new energy power plants; The setting based on the dynamic primary frequency regulation and steady-state AGC coordination parameters calculate Including: If For dynamic primary frequency modulation lockout steady-state AGC, the following steps are performed: (31) If In the initial startup state, the active electrical quantities at startup time are... = If the condition is met, proceed to step (32); otherwise, proceed directly to step (32). (32) If If it is in a low-frequency start-up state, then the theoretical adjustment amount for low frequency is... The first correction and verification were performed to obtain the first adjustment value. The for Power generation limit of new energy power plants The smaller of the two values ​​is used to proceed to step (33). like In a high-frequency start-up state, the high-frequency theoretical adjustment amount is... The first correction and verification were performed to obtain the first adjustment value. The for Power reduction limit for new energy power plants The smaller of the two values ​​is used to proceed to step (34). (33) A second verification was performed to obtain the second adjustment correction value. ;like and The sum of these is greater than the rated installed capacity of the new energy power station. ,but = ,otherwise = Proceed to step (35); (34) A second verification was performed to obtain the second adjustment correction value. ;like and The difference is greater than the minimum output power limit setting. ,but = ,otherwise = Proceed to step (35); (35) If The absolute value is greater than the minimum action threshold setpoint for each round of control. ,but Otherwise, no power adjustment is performed, i.e. ; The low-frequency theoretical adjustment amount is calculated using a piecewise linear function of frequency and active power. and the aforementioned high-frequency theoretical adjustment amount ; in, For the rated installed capacity of new energy power stations, This is the frequency scrambling setpoint. The system's rated frequency, This refers to the frequency scrambling diastolic rate. This is the frequency upscrambling setpoint. This represents the frequency upscrambling modulation rate.

2. The emergency, dynamic, and steady-state active power coordinated control method for new energy power stations according to claim 1, characterized in that, The setting based on the dynamic primary frequency regulation and steady-state AGC coordination parameters calculate Including: If For steady-state AGC lockout dynamic primary frequency regulation, then .

3. The emergency, dynamic, and steady-state active power coordinated control method for new energy power stations according to claim 1, characterized in that, The setting based on the dynamic primary frequency regulation and steady-state AGC coordination parameters calculate Including: If To ensure that steady-state AGC and dynamic primary frequency modulation are superimposed in both forward and reverse directions, the following steps are performed: (51) If In the initial startup state, the active electrical quantities at startup time are... = If the condition is met, proceed to step (52); otherwise, proceed directly to step (52). (52) If If it is in a low-frequency start-up state, then the theoretical adjustment amount for low frequency is... The first correction and verification were performed to obtain the first adjustment value. The for Power generation limit of new energy power plants The smaller of the two values ​​is used to proceed to step (53). like In a high-frequency start-up state, the high-frequency theoretical adjustment amount is... The first correction and verification were performed to obtain the first adjustment value. The for Power reduction limit for new energy power plants The smaller of the two values ​​is used to proceed to step (54). (53) A second verification was performed to obtain the second adjustment correction value. ;like and The sum of these is greater than the rated installed capacity of the new energy power station. ,but = ,otherwise = Proceed to step (55); (54) A second verification was performed to obtain the second adjustment correction value. ;like and The difference is greater than the minimum output power limit setting. ,but = ,otherwise = Proceed to step (55); (55) If The absolute value is greater than the minimum action threshold setpoint for each round of control. ,but Otherwise, no power adjustment is performed, i.e. .

4. The emergency, dynamic, and steady-state active power coordinated control method for new energy power stations according to claim 1, characterized in that, The setting based on the dynamic primary frequency regulation and steady-state AGC coordination parameters calculate Including: If To achieve steady-state AGC and dynamic primary frequency regulation in the same direction with reverse blocking, the following steps are performed for dynamic primary frequency regulation: (61) If In the initial startup state, the active electrical quantities at startup time are... The last steady-state AGC planned value If the condition is met, proceed to step (62); otherwise, proceed directly to step (62). (62) If If it is in high-frequency start state, then proceed to step (65); like In the low-frequency start-up state, if there is a change in the steady-state AGC plan, proceed to step (63). If there is no change in the steady-state AGC plan and no blocking dynamic primary frequency regulation flag, the active power correction value is given at the start-up time. Equal to the latest steady-state AGC instruction value When the steady-state AGC plan remains unchanged and there is a lockout dynamic primary frequency regulation flag, no power regulation is performed. ; (63) If the latest steady-state AGC plan value is Greater than the previous steady-state AGC planned value Cancel the interlock for dynamic primary frequency regulation, and set the active power correction value at startup. Equal to the latest steady-state AGC instruction value Then proceed to step (64); otherwise, lock out dynamic primary frequency modulation. ; (64) then adjust the low-frequency theoretical amount The first correction and verification were performed to obtain the first adjustment value. The for Power generation limit of new energy power plants The smaller of the two; for A second verification was performed to obtain the second adjustment correction value. If there is an active power correction value at startup and The sum of these is greater than the rated installed capacity of the new energy power station. ,but = ,otherwise = Proceed to step (68); (65) When the steady-state AGC plan changes, proceed to step (66); when the steady-state AGC plan does not change and there is no blocking dynamic primary frequency regulation flag, the active power correction value at the start time is given. Equal to the latest steady-state AGC instruction value Then proceed to step (67); when the steady-state AGC plan remains unchanged and there is a lockout dynamic primary frequency regulation flag, no power regulation is performed. ; (66) If the latest steady-state AGC command value Less than the previous steady-state AGC planned value Cancel the interlock for dynamic primary frequency regulation, and set the active power correction value at startup. Equal to the latest steady-state AGC instruction value Then proceed to step (67); otherwise, lock out dynamic primary frequency modulation. ; (67) Adjustment amount for high-frequency theory The first correction and verification were performed to obtain the first adjustment value. The for Power reduction limit for new energy power plants The smaller of the two, for A second verification was performed to obtain the second adjustment correction value. ; like and The difference is greater than the minimum output power limit setting. ,but = ,otherwise = Proceed to step (68); (68) If The absolute value is greater than the minimum action threshold setpoint for each round of control. ,but Otherwise, no power adjustment will be performed, i.e. .

5. The emergency, dynamic, and steady-state active power coordinated control method for new energy power stations according to claim 1, characterized in that, The setting based on the dynamic primary frequency regulation and steady-state AGC coordination parameters calculate Including: If To achieve a steady-state AGC and a dynamic primary frequency modulation superimposed in the same direction with a reverse-blocking steady-state AGC, the following steps are performed: (71) If In the initial startup state, the active electrical quantities at startup time are... The last steady-state AGC planned value ;like If it is not the first startup state, then = , The active power correction value at startup is set, proceed to step (72); (72) If If it is in low-frequency startup state, then Take the previous steady-state AGC plan value and the latest steady-state AGC command value The larger of the two values ​​corresponds to the theoretical adjustment amount for low frequencies. The first correction and verification were performed to obtain the first adjustment value. , Pick Power generation limit of new energy power plants Find the smaller of the two values; proceed to step (73); like In high-frequency start-up mode, then Pick and The smaller of the two values ​​corresponds to the adjustment amount in high-frequency theory. The first correction and verification were performed. , Pick Power limits will be set for new energy power plants. Find the smaller of the two values; proceed to step (74). (73) A second verification was performed to obtain the second adjustment correction value. ,like and The sum of these is greater than the rated installed capacity of the new energy power station. ,but = ,otherwise = Proceed to step (75); (74) A second verification was performed. ,like and The difference is greater than the minimum output power limit setting. ,but = ,otherwise = Proceed to step (75); (75) If The absolute value is greater than the minimum action threshold setpoint for each round of control. ,but Otherwise, no power adjustment will be performed, i.e. .

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the computer program is loaded into the processor, it implements the emergency, dynamic, and steady-state active power coordinated control method for new energy power plants according to any one of claims 1-5.

7. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the emergency, dynamic, and steady-state active power coordinated control method for new energy power plants according to any one of claims 1-5.

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