CN105808889B - Frequency deviation coefficient simulation configuration method - Google Patents
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Abstract
The invention provides a frequency deviation coefficient simulation configuration method, which comprises the steps of establishing a data model based on overall process dynamic simulation and researching a small disturbance and large disturbance fault set of frequency characteristics; calculating a natural frequency characteristic coefficient of the region; initially forming a frequency deviation coefficient configuration scheme; the control capacity of the power grid frequency under the condition of small disturbance is simulated and analyzed, and the power grid frequency recovery and regional tie line power control capacity under the condition of large disturbance fault are achieved; if the corresponding conditions are met, the frequency deviation coefficient configuration scheme is considered to be good in effect; if not, adjusting the configuration scheme; and determining a final configuration scheme of the frequency deviation coefficient. The method has comprehensive consideration factors, reasonable scheme and good adaptability to different operation conditions and fault modes of the power grid; the method is favorable for guiding and configuring a reasonable frequency deviation coefficient scheme, so that the frequency recovery and the tie-line power control capability of the power system in small disturbance and large disturbance faults are improved.
Description
Technical Field
The invention relates to the field of power systems, in particular to a frequency deviation coefficient simulation configuration method.
Background
The interconnected power system requires the control frequency and the inter-area link exchange power to be maintained at a planned value, and the main technical means for realizing the function is automatic power generation control (AGC). The AGC calculates regional control deviation (ACE) in real time according to different control modes, and keeps the ACE in a specified range by adjusting the active power output of each regional AGC unit, so that the frequency and the exchange power of the connecting wire are recovered to a planned value, and the balance of the power generation and the load of the system under the planned frequency is realized. The selection of the frequency deviation coefficient (B coefficient) for each control region has a significant effect on the control stability and dynamic response characteristics of the AGC.
At present, fixed B coefficients are adopted at home and abroad, and no theory exists on how to select the B coefficients of a control area to control the control effect and the automation level of the system more reasonably. In order to compare and select the different B coefficients of each zone to the system frequency recovery and the inter-zone tie line power control effect, a whole process dynamic simulation system is adopted to analyze and verify the validity and rationality of medium-long term frequency adjustment.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a frequency deviation coefficient simulation configuration method, which is used for simulating and analyzing a long-term frequency control dynamic process in an interconnected power grid, and researching a set of scientific and reasonable frequency deviation coefficient simulation configuration method based on the basic principle of frequency deviation coefficient selection, thereby improving the frequency quality and the operation efficiency of the whole system.
The invention aims at adopting the following technical scheme:
a frequency deviation coefficient simulation configuration method, the method comprising the steps of:
step A: establishing a data model based on the whole-process dynamic simulation;
and (B) step (B): establishing a small disturbance and large disturbance fault set for researching frequency characteristics;
step C: calculating a natural frequency characteristic coefficient of the region;
step D: according to different automatic power generation control, a configuration scheme of frequency deviation coefficients is formed preliminarily;
step E: the control capacity of the power grid frequency under the condition of small disturbance is simulated and analyzed, and if the corresponding condition is met, the effect of the frequency deviation coefficient configuration scheme is considered to be good; if not, adjusting the configuration scheme;
step F: the power grid frequency recovery and regional tie line power control capability under the large disturbance fault state are simulated and analyzed, and if corresponding conditions are met, the frequency deviation coefficient configuration scheme is considered to be good in effect; if not, the configuration scheme is adjusted, and a final configuration scheme of the frequency deviation coefficient B is determined.
Preferably, in the step a, an accurate element model closely related to the dynamic response characteristic of the power grid frequency is built in a data model based on the whole-process dynamic simulation, and the element model comprises a generator set speed regulator, an AGC, a power system stabilizer PSS, a load model and a direct current frequency limiting control device FLC.
Preferably, in the step B, the small disturbance fault set includes load fluctuation, dc power planning deviation, load prediction deviation and power generation planning deviation; the large disturbance fault set comprises direct current blocking, large unit tripping and outgoing line tripping of a large power plant.
Preferably, in the step C, the natural frequency characteristic coefficient of the region represents the primary frequency modulation capability of the region, and the primary frequency modulation capability is composed of the following two parts, wherein the unit is MW/Hz:
β＝K L +K G ；
wherein: k (K) L For static frequency characteristics of the load, K G The static frequency characteristic of the generator set;
the beta value can be obtained through actual measurement and simulation calculation, and the weighting coefficient k is considered according to the actual requirements of different power grids 0 、k 1 、k 2 、…、k n The calculation formula of beta is as follows:
β＝k 0 β 0 +k 1 β 1 +k 2 β 2 …+k n β n
wherein beta is 0 、β 1 、β 2 、…、β n The calculation method of (2) is as follows:
β 0 is an actual measurement value;
β 1 by a load increase method: the whole network AGC is withdrawn, when the load of the simulation area continuously increases according to a certain rate, the area frequency change curve records the increase of the load when the frequency decreases by 0.1Hz, namely the area beta 1 A value;
β 2 、…、β n by a high-power disturbance method: exiting the full-network AGC, when high-power disturbance occurs in the simulation area, calculating an area beta according to the area frequency change curve and the ratio of the total power change quantity to the frequency difference 2 、…、β n Values.
Preferably, in the step D, a frequency deviation coefficient configuration scheme is preliminarily formed according to different automatic power generation controls:
for an asynchronously operated power system, an AGC generally adopts a constant frequency control mode FFC to maintain the system frequency constant, and the exchange power on a communication line is not controlled, wherein in the control mode, the B value of a frequency deviation coefficient is close to and slightly smaller than the beta value;
for an interconnected power system comprising a plurality of control zones, each control zone I 1 ，I 2 ，…，I k The AGC in the middle adopts a fixed tie line frequency deviation control mode TBC; in the control mode, the total B value of the whole interconnected power system is close to and slightly smaller than the beta value, and the B values of all the control partitions are configured according to the duty ratio:
wherein: p (P) i For controlling the active load of the partition i, k is the number of the control partitions, B s Is the total B value of the entire interconnected power system.
Preferably, the step E includes the steps of:
simulation analysis of the change condition of the interconnected network frequency under small disturbance faults;
judging whether a simulation result meets corresponding conditions or not when a small disturbance fault occurs, and if so, considering that the frequency deviation coefficient configuration scheme is good; if the frequency deviation coefficient is not satisfied, the frequency deviation coefficient is adjusted, and the power grid frequency is restored to be within the range of 50+/-0.1 Hz under the condition of no frequency oscillation.
Further, in the step E, the corresponding conditions that the simulation result satisfies when the small disturbance fault occurs include:
steady-state frequency f of interconnected network s Restoring to 50+/-0.1 Hz; and
the AGC action starts to have no frequency oscillation phenomenon in the frequency recovery process;
if the above condition is not satisfied, the adjustment principle of the frequency deviation coefficient is as follows: if the steady-state frequency f of the interconnected power grid s If the frequency is not restored to be within 50+/-0.1 Hz, the value B is increased appropriately; if a frequency oscillation phenomenon occurs therebetween, the B value is appropriately reduced.
Preferably, in the step F, the simulation analysis of the change condition of the interconnection network frequency and the tie line exchange power deviation between the control partitions in the large disturbance fault state specifically includes: judging whether the simulation result meets the corresponding condition when the large disturbance fault occurs, and if so, considering that the frequency deviation coefficient configuration scheme has good effect; if the power grid frequency is not satisfied, the frequency deviation coefficient is adjusted to enable the power grid frequency to be restored to be within the range of 50+/-0.1 Hz, and the exchange power deviation of the interconnection lines between the partitions is controlled to be within a reasonable range.
The corresponding conditions for judging the satisfaction of the simulation result when the large disturbance fault occurs include:
1) Steady-state frequency f of interconnected network s Restoring to the range of 50+/-0.1 Hz;
2) Time t from start of AGC action to recovery of frequency to 49.9Hz α Controlling the temperature in a reasonable range;
3) Tie line power deviation ΔP A→B ，ΔP B→C … is controlled to a reasonable range and |Δp| is decreasing after AGC action.
Further, in the step F, the principle of adjusting the frequency deviation coefficient includes:
if f s If the frequency is not restored to the range of 50+/-0.1 Hz, the value B is increased appropriately; if t α If the value exceeds the reasonable range, the value B is properly increased; if the phenomenon of |DeltaP| increase after AGC operation occurs, thenThe B value is suitably reduced.
Further, if the AGC adopts the control mode of the TBC, the frequency deviation coefficient is configured according to the step D; if the AGC is in FFC mode, the content of the link switching power deviation between the control partitions in step F is not considered.
Compared with the prior art, the invention has the following beneficial effects:
1. the frequency deviation coefficient simulation configuration method provided by the invention builds a dynamic simulation system for researching the short-term and medium-long-term frequency adjustment of the interconnected power grid, and the medium-long-term frequency control dynamic process is simulated and analyzed, so that important roles of AGC in frequency adjustment under small disturbance, frequency recovery under large disturbance and regional tie line power control are fully considered.
2. The invention has comprehensive consideration factors, reasonable scheme and good adaptability to different operation conditions and fault modes of the power grid. The simulation method is favorable for guiding and configuring a reasonable frequency deviation coefficient scheme, and improves the frequency recovery and tie line power control capability of the power system in small disturbance and large disturbance faults.
Drawings
FIG. 1 is a flow chart of a frequency deviation coefficient simulation configuration method provided by the invention;
fig. 2 is a schematic diagram of an interconnected synchronous power grid after extra-high voltage direct current input provided by the invention;
fig. 3 is a schematic diagram of a frequency change curve of a main network under continuous load increase in a square enlargement mode provided by the invention;
fig. 4 is a graph of a frequency change of a main network under three B-coefficient configuration schemes provided by the present invention; in the graph, (a) a graph of a change curve of the frequency of the main network along with synchronous regulation and reduction of direct current and the output of a power plant, (b) a graph of a change curve of the frequency of the main network along with load fluctuation, (c) a graph of a change curve of the frequency of the main network under the condition of the Guangdong shortage 5000MW fault, and (d) a graph of a change curve of the power of a connecting line of Guizhou in the three schemes under the condition of the Guangdong shortage 5000MW fault.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
The frequency deviation coefficient simulation configuration method provided by the invention fully considers the important roles of AGC in frequency adjustment under small disturbance, frequency recovery under large disturbance and regional tie line power control, and is beneficial to guiding and configuring a reasonable frequency deviation coefficient scheme during long-term frequency control dynamic process in simulation analysis; as shown in fig. 1, the method comprises the following steps:
step A: establishing a data model based on the whole-process dynamic simulation; in the step A, an accurate element model closely related to the dynamic response characteristic of the power grid frequency is constructed in a data model based on the whole-process dynamic simulation, and the element model comprises a generator set speed regulator, an AGC, a Power System Stabilizer (PSS), a load model, a direct current frequency limiting control device (FLC) and the like.
And (B) step (B): establishing a small disturbance and large disturbance fault set for researching frequency characteristics; in the step B, a small disturbance fault set of frequency characteristics is researched, wherein the small disturbance fault set comprises load fluctuation, direct current power planning deviation, load prediction deviation, power generation planning deviation and the like; the large disturbance fault set comprises direct current blocking, large unit tripping, outgoing line tripping of a large power plant and the like.
Step C: calculating a natural frequency characteristic coefficient of the region; the natural frequency characteristic coefficient of the region represents the primary frequency modulation capability of the region and consists of the following two parts, wherein the unit of the primary frequency modulation capability is MW/Hz;
β＝K L +K G ；
wherein: k (K) L For static frequency characteristics of the load, K G The static frequency characteristic of the generator set;
the beta value can be obtained through actual measurement and simulation calculation, and the weighting coefficient k is considered according to the actual requirements of different power grids 0 、k 1 、k 2 、…、k n The calculation formula of beta is as follows:
β＝k 0 β 0 +k 1 β 1 +k 2 β 2 …+k n β n
wherein beta is 0 、β 1 、β 2 、…、β n The calculation method of (2) is as follows:
β 0 is an actual measurement value;
β 1 by a load increase method: the whole network AGC is withdrawn, when the load of the simulation area continuously increases according to a certain rate, the area frequency change curve records the increase of the load when the frequency decreases by 0.1Hz, namely the area beta 1 A value;
β 2 、…、β n by a high-power disturbance method: when the full-network AGC is withdrawn and high-power disturbance (including direct current blocking, tripping of a large unit, tripping of an outgoing line of a large power plant, disconnection of connecting lines between the area and the outer area and the like) occurs in a simulation area, an area frequency change curve is calculated, and an area beta is calculated according to the ratio of the total power change quantity to the frequency difference 2 、…、β n Values.
Step D: according to different automatic power generation control, such as AGC control mode; initially forming a configuration scheme of a frequency deviation coefficient (B coefficient); for an asynchronously operated power system, an AGC generally adopts a constant frequency control mode FFC, the system frequency is maintained constant, the exchange power on a communication line is not controlled, and under the control mode, the B value of a frequency deviation coefficient is close to and slightly smaller than the beta value;
for an interconnected power system comprising a plurality of control zones, each control zone I 1 ，I 2 ，…，I k The AGC in the middle adopts a fixed tie line frequency deviation control mode TBC; in the control mode, the total B value of the whole interconnected power system is close to and slightly smaller than the beta value, and the B values of all the control partitions are configured according to the duty ratio:
wherein: p (P) i For controlling the active load of the partition i, k is the number of the control partitions, B s Is the total B value of the entire interconnected power system.
Step E: the control capacity of the power grid frequency under the condition of small disturbance is simulated and analyzed, and if the corresponding condition is met, the effect of the frequency deviation coefficient configuration scheme is considered to be good; if not, adjusting the configuration scheme;
the condition is that the frequency deviation coefficient B configuration scheme has good effect; if not, the configuration scheme is adjusted, and a final configuration scheme of the frequency deviation coefficient B is determined.
The step E comprises the following steps:
simulation analysis of the change condition of the interconnected network frequency under small disturbance faults;
judging whether the simulation result meets the corresponding condition when the small disturbance fault occurs or not, comprising the following steps:
steady-state frequency f of interconnected network s Restoring to 50+/-0.1 Hz;
the AGC action starts to have no frequency oscillation phenomenon in the frequency recovery process.
If yes, the configuration scheme of the frequency deviation coefficient B is considered to be good; if the frequency deviation coefficient B is not satisfied, the frequency deviation coefficient B is adjusted, and the power grid frequency is restored to be within the range of 50+/-0.1 Hz under the condition of no frequency oscillation.
The adjustment principle of the frequency deviation coefficient B is as follows: if the steady-state frequency f of the interconnected power grid s If the frequency is not restored to be within 50+/-0.1 Hz, the value B is increased appropriately; if a frequency oscillation phenomenon occurs therebetween, the B value is appropriately reduced.
If the corresponding conditions are met, the configuration scheme of the frequency deviation coefficient B is considered to be good in effect; if not, the configuration scheme is adjusted, and a final configuration scheme of the frequency deviation coefficient B is determined. The method comprises the following specific steps:
simulation analysis is carried out on the change condition of the interconnection power grid frequency and the exchange power deviation of the interconnecting lines between each control partition under the large disturbance fault state; judging whether the simulation result meets the corresponding condition when the large disturbance fault occurs, and if so, considering that the frequency deviation coefficient (B coefficient) configuration scheme has good effect; if the power grid frequency is not satisfied, the frequency deviation coefficient (B coefficient) is adjusted to enable the power grid frequency to be restored to be within the range of 50+/-0.1 Hz, and the exchange power deviation of the connecting lines between the partitions is controlled to be within a reasonable range.
In the step F, the corresponding conditions met by the simulation result when the large disturbance fault occurs include:
1) Steady-state frequency f of interconnected network s Restoring to the range of 50+/-0.1 Hz;
2) Time t from start of AGC action to recovery of frequency to 49.9Hz α Controlling the temperature in a reasonable range;
3) Tie line power deviation ΔP A→B ，ΔP B→C … is controlled to a reasonable range and |Δp| is decreasing after AGC action.
The principle of adjusting the frequency deviation coefficient B includes:
if f s If the frequency is not restored to the range of 50+/-0.1 Hz, the value B is increased appropriately; if t α The value B should be properly increased beyond the reasonable range; if the phenomenon of |Δp| increase after the AGC operation occurs, the B value is appropriately decreased.
If the AGC adopts a TBC control mode, configuring a frequency deviation coefficient B according to the step D; if the AGC is in FFC mode, the content of the link switching power deviation between the control partitions in step F is not considered.
Examples:
the early-stage Yunnan power grid and the south-network main network are asynchronously interconnected to form a transmitting-end Yunnan power grid as a synchronous power grid, and Guangxi, guizhou, guangdong and Hainan form a south-network main network, namely a receiving-end synchronous power grid. After the asynchronous networking mode is entered, the system operation stability characteristics of the Yunnan power grid and the south network main network are greatly changed as the interconnection is formed only by the direct current lines, and the original frequency deviation coefficients of all areas need to be reset. Taking a south-net main network as an example, the frequency deviation coefficient simulation configuration method provided by the invention comprises the following steps:
step A: and establishing a simulation data model of the whole south power grid in a 2016 Feng Dacron mode, wherein the Yunnan power grid and the south network main network are interconnected only through a direct current line. The schematic diagram of the interconnection relationship of the south power grid provinces is shown in fig. 3.
And (B) step (B): and establishing a small disturbance and large disturbance fault set for researching frequency characteristics. The small disturbance fault set includes: the load of Guizhou, guangdong and Guangxi fluctuates successively; the bovine direct current power is reduced by 100MW; and synchronously regulating and reducing the output of direct current and a power plant. The large disturbance fault set includes: chu Sui direct current bipolar locking, cattle from direct current bipolar locking, guangdong power off 2000MW, guizhou power off 2400MW and Guangxi power off 1000MW.
Step C: and calculating a natural frequency characteristic coefficient beta of the south network main network.
(1) Load extension method:
the main network AGC is withdrawn from simulation, the main network load is continuously increased at the rate of 1%/min, and the main network frequency curve is shown in figure 3, so that when the load is increased to 2689MW in the enlargement mode, the main network frequency is reduced from 50.00Hz to 49.90Hz, and the power-frequency factor beta of the main network in the enlargement mode can be estimated to be about 2689MW/0.1Hz.
(2) High power perturbation method:
the frequency simulation results under the large disturbance power shortage in the large mode are shown in table 1:
TABLE 1 frequency calculation results under large disturbance Power deficiency in the Makeup mode
| Fault type | Power shortage (MW) | Quasi-steady state recovery frequency (Hz) | β(MW/0.1Hz) |
| Constant-benefit power plant unit machine-dropping |
600 | 49.97 | 2000 |
| Machine unit of desert power plant drops machine | 1000 | 49.97 | 3333 |
| Bovine-slave monopole latch | 1600 | 49.95 | 3200 |
| Single pole lock for fuqiao | 2500 | 49.91 | 2778 |
| Chu Sui monopolar closure | 2500 | 49.91 | 2778 |
| Cattle slave bipolar closure | 3200 | 49.87 | 2462 |
| Chu Sui bipolar latch | 5000 | 49.81 | 2632 |
| Bovine-derived+praise two-cycle single lock | 4100 | 49.83 | 2412 |
| Chu Sui +two-cycle single-lock | 5000 | 49.81 | 2632 |
Step D: the total main power water motor adopts a fixed frequency control mode (FFC), other direct-tuning units of the total main power water motor adopt a fixed connection line and frequency deviation control mode (TBC), and the direct-tuning units in four provinces of Guangdong, guangxi, guizhou and Hainan adopt a fixed connection line and frequency deviation control mode (TBC). Based on the simulation analysis of the step C, the natural frequency characteristic coefficient beta of the main network is between 2500 and 2800MW/0.1 Hz. The B coefficient of the AGC is close to the beta value as much as possible, and meanwhile, the AGC is considered to have a certain undershoot condition, so that the AGC is not frequently and repeatedly adjusted to form a frequency deviation coefficient (B coefficient) configuration scheme B 1 ：
TABLE 2 frequency deviation coefficient (B coefficient) configuration scheme B 1
| Scheme for the production of a semiconductor device | General alignment and adjustment | Guangdong aspect | Guangxi province (China) | Guizhou (Guizhou) | Hainan of Hainan |
| B 1 | 110 | 1500 | 106 | 170 | 25 |
Step E: and the control capacity of the power grid frequency under the condition of small disturbance is simulated and analyzed. Simulation results show that under the conditions of small disturbance such as load fluctuation, direct current plan deviation and the like, the scheme B is configured 1 The control effect of the system steady-state frequency can be met, the frequency of the south main network is controlled within the range of 50+/-0.1 Hz, and the problem of frequency oscillation does not occur.
Step F: and (5) simulating and analyzing the power grid frequency recovery and regional tie line power control capability under the large disturbance fault.
TABLE 3 configuration scheme B 1 Frequency characteristics of corresponding main network system under different power shortages
As can be seen from the simulation results of Table 3, configuration scheme B 1 In the aspect of frequency recovery, the frequency of a main network cannot be recovered to 49.9Hz under the Chu spike direct current bipolar blocking fault (the power shortage of the main network is 5000 MW); in the aspect of tie line control, the tie section tide increment value is within an acceptable range. Aiming at the problem that the frequency of the Chu Sui direct-current bipolar blocking fault main network cannot be recovered to 49.9Hz, the B value is considered to be increased to form a configuration scheme B 2 。
TABLE 4 frequency deviation coefficient (B coefficient) configuration scheme B 2
| Scheme for the production of a semiconductor device | General alignment and adjustment | Guangdong aspect | Guangxi province (China) | Guizhou (Guizhou) | Hainan of Hainan |
| B 2 | 110 | 1500 | 384 | 580 | 25 |
Simulation analysis configuration scheme B 2 Grid frequency recovery and regional tie line power control capability for small and large disturbance faults. In the case of small disturbances, configuration scheme B 2 The control effect of the system steady-state frequency can be met, the frequency of the south main network is controlled within the range of 50+/-0.1 Hz, and the problem of frequency oscillation does not occur. Under the condition of large disturbance fault, configuration scheme B 2 The control effect of the system steady-state frequency can be met, but the Guangxi communication section tide in Guizhou continues to increase after the AGC participates, and the B value is considered to be reduced, so that a configuration scheme B is formed 3 。
TABLE 5 frequency deviation coefficient (B coefficient) configuration scheme B 3
| Scheme for the production of a semiconductor device | General alignment and adjustment | Guangdong aspect | Guangxi province (China) | Guizhou (Guizhou) | Hainan of Hainan |
| B 3 | 110 | 1500 | 245 | 295 | 25 |
To configuration scheme B 3 The adaptability analysis is carried out, and the simulation result shows that the scheme B is configured under the faults of small disturbance and large disturbance 3 The effect of frequency recovery value and the effect of tie line power control are considered (three configuration schemes of B coefficient are compared and shown in figure 4). Therefore, the main network AGC recommends using configuration scheme B 3 I.e., the full net 2150MW/0.1Hz, the total alignment was 110MW/0.1Hz, guangdong 1500MW/0.1Hz, guangxi 245MW/0.1Hz, guizhou 295MW/0.1Hz, hainan 25MW/0.1Hz.
The frequency deviation coefficient simulation configuration method is favorable for guiding and configuring a reasonable frequency deviation coefficient scheme, has the advantages of being strong in adaptability, comprehensive in consideration factors and the like, and has high practical value and good market prospect. Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the scope of the claims.
Claims (6)
1. A frequency deviation coefficient simulation configuration method, characterized in that the method comprises the following steps:
step A: establishing a data model based on the whole-process dynamic simulation;
and (B) step (B): establishing a small disturbance and large disturbance fault set for researching frequency characteristics;
in the step B, the small disturbance fault set comprises load fluctuation, direct current power plan deviation, load prediction deviation and power generation plan deviation; the large disturbance fault set comprises direct current blocking, large unit tripping and large power plant outgoing line tripping;
step C: calculating a natural frequency characteristic coefficient of the region;
in the step C, the natural frequency characteristic coefficient beta of the region represents the primary frequency modulation capability of the region and consists of the following two parts, wherein the unit of the primary frequency modulation capability is MW/Hz;
β＝K L +K G ；
wherein: k (K) L For static frequency characteristics of the load, K G The static frequency characteristic of the generator set;
the beta value can be obtained through actual measurement and simulation calculation, and the weighting coefficient k is considered according to the actual requirements of different power grids 0 、k 1 、k 2 、...、k n The calculation formula of beta is as follows:
β＝k 0 β 0 +k 1 β 1 +k 2 β 2 ...+k n β n
wherein beta is 0 、β 1 、β 2 、...、β n The calculation method of (2) is as follows:
β 0 is an actual measurement value;
β 1 by a load increase method: the whole network AGC is withdrawn, when the load of the simulation area continuously increases according to the preset rate, the area frequency change curve records the increase of the load when the frequency decreases by 0.1Hz, namely the area beta 1 A value;
β 2 、...、β n by a high-power disturbance method: exiting the full-network AGC, when high-power disturbance occurs in the simulation area, calculating an area beta according to the area frequency change curve and the ratio of the total power change quantity to the frequency difference 2 、...、β n A value;
step D: according to different automatic power generation controls, a frequency deviation coefficient configuration scheme is formed preliminarily;
in the step D, the preliminary forming of the frequency deviation coefficient configuration scheme includes:
for an asynchronously operated power system, an AGC (automatic gain control) adopts a constant frequency control mode FFC to maintain the system frequency constant, and the exchange power on a communication line is not controlled, wherein in the control mode, the B value of a frequency deviation coefficient is close to and slightly smaller than the beta value;
for an interconnected power system comprising a plurality of control zones, each control zone I 1 ，I 2 ，...，I k The AGC in the middle adopts a fixed tie line frequency deviation control mode TBC; in the control mode, the total B value of the whole interconnected power system is close to and slightly smaller than the beta value, and the B values of all the control partitions are configured according to the duty ratio:
wherein: p (P) i For controlling the active load of the partition i, k is the number of the control partitions, B s For the totality of the whole interconnected power systemB value；
Step E: the control capacity of the power grid frequency under the condition of small disturbance is simulated and analyzed, and if the condition 1 is met, the effect of the frequency deviation coefficient configuration scheme is considered to be good; if not, adjusting the configuration scheme;
in the step E, the condition 1 satisfied by the simulation result when the small disturbance fault occurs includes:
steady-state frequency f of interconnected network s Restoring to 50+/-0.1 Hz; and
the AGC action starts to have no frequency oscillation phenomenon in the frequency recovery process;
if the above condition is not satisfied, the adjustment principle of the frequency deviation coefficient is as follows: if the steady-state frequency f of the interconnected power grid s If the frequency is not restored to be within 50+/-0.1 Hz, the value B is increased appropriately; if the frequency oscillation phenomenon occurs in the middle, the value B is properly reduced;
step F: the power grid frequency recovery and regional tie line power control capability under the large disturbance fault state are simulated and analyzed, and if the corresponding condition 2 is met, the frequency deviation coefficient configuration scheme is considered to be good in effect; if not, adjusting the configuration scheme, and determining a final configuration scheme of the frequency deviation coefficient;
the condition 2 for judging that the simulation result is satisfied when the large disturbance fault occurs includes:
1) Steady-state frequency f of interconnected network s Restoring to the range of 50+/-0.1 Hz;
2) Time t from start of AGC action to recovery of frequency to 49.9Hz α Controlling the temperature in a reasonable range;
3) Tie line power deviation ΔP A→B ，ΔP B→C ,. control is in a reasonable range and |Δp| is decreasing after AGC action.
2. The method according to claim 1, wherein in the step a, an accurate element model closely related to the dynamic response characteristic of the power grid frequency is built in a data model based on the whole process dynamic simulation, including a generator set governor, an AGC, a power system stabilizer PSS, a load model and a direct current frequency limiting control device FLC.
3. The method according to claim 1, wherein said step E comprises the steps of:
simulation analysis of the change condition of the interconnected network frequency under small disturbance faults;
judging whether the simulation result meets the condition 1 or not when the small disturbance fault occurs, and if so, considering that the frequency deviation coefficient configuration scheme has good effect; if the frequency deviation coefficient is not satisfied, the frequency deviation coefficient is adjusted, and the power grid frequency is restored to be within the range of 50+/-0.1 Hz under the condition of no frequency oscillation.
4. The method according to claim 1, wherein in the step F, the simulation analysis of the variation of the interconnection network frequency and the tie-line exchange power deviation between the control partitions in the large disturbance fault state specifically includes: judging whether the simulation result when the large disturbance fault occurs meets the condition 2 or not, and if so, considering that the frequency deviation coefficient configuration scheme has good effect; if the power grid frequency is not satisfied, the frequency deviation coefficient is adjusted to enable the power grid frequency to be restored to be within the range of 50+/-0.1 Hz, and the exchange power deviation of the interconnection lines between the partitions is controlled to be within a reasonable range.
5. The method of claim 4, wherein the adjusting the frequency deviation factor in step F includes:
if f s If the frequency is not restored to the range of 50+/-0.1 Hz, the value B is increased appropriately; if t α If the value exceeds the reasonable range, the value B is properly increased; if the phenomenon of |Δp| increase after the AGC operation occurs, the B value is appropriately decreased.
6. The method of claim 1, wherein if the AGC uses a control mode of the TBC, the frequency deviation coefficient is configured according to the step D; if the AGC is in FFC mode, the content of the link switching power deviation between the control partitions in step F is not considered.
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| CN107749631B (en) * | 2017-10-25 | 2020-10-30 | 国电南瑞科技股份有限公司 | Unit primary frequency modulation capability pre-estimating method |
| CN108988359A (en) * | 2018-08-01 | 2018-12-11 | 深圳供电局有限公司 | Non-linear automatic power generation control method, device, equipment and medium |
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| CN110417031B (en) * | 2019-07-05 | 2021-06-11 | 国电南瑞科技股份有限公司 | Method for sectionally setting frequency deviation coefficient of automatic power generation control system |
| CN110854852B (en) * | 2019-11-29 | 2023-12-29 | 中国南方电网有限责任公司 | Configuration method of key parameters of AGC main station in high-proportion hydropower area |
| CN112186777B (en) * | 2020-09-03 | 2022-03-15 | 中国南方电网有限责任公司 | AGC frequency deviation coefficient adjusting method, system and device for inhibiting frequency oscillation |
| CN112821383A (en) * | 2021-01-04 | 2021-05-18 | 国网重庆市电力公司 | Power system natural frequency characteristic coefficient interval prediction method based on deep learning |
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