CN108808656A - The provincial control zone of interconnected network adjusts the AGC control methods of spare Real-Time Sharing - Google Patents

Abstract

The application discloses a kind of spare Real-Time Sharing AGC control methods of provincial control zone adjusting of interconnected network,Fully consumption leads to spare deficiency under power grid adjusting to new energy after being run for current electric grid new energy large-scale grid connection,Or the spare insufficient operation present situation on the provincial power network of Load in Summer peak phase part,By dividing the adjusting for adjusting side to monitor each province's tune control zone in real time spare,When provincial control zone adjusts spare insufficient, automatic or manual application is fused to adjacent spare sufficient control zone automatically to spare insufficient control zone,New control zone Xian Jiangliang control zone ACE after merging are added to obtain new control zone ACE,Control zone ACE distribution is carried out according still further to spare nargin and issues control,Realization adjusts spare Real-Time Sharing between control zone,The AGC regulating powers of the whole network are utilized to greatest extent,Promote the consumption of the whole network new energy,Ensure the operational safety of power grid.

Description

AGC control method for real-time sharing of regulation and backup in provincial control areas of interconnected power grid

technical field

The invention belongs to the field of active power control of electric power systems, and relates to a real-time control method for adjusting standby after large-scale new energy grid-connected large-scale generation or summer load peak period causes serious shortage of provincial regulation and reserve. The method proposes real-time coordination of separate regulation and provincial regulation The control strategy realizes the integrated AGC (Automatic Generation Control, automatic generation control) control of the whole network through the real-time sharing of provincial power grid regulation backup.

Background technique

In terms of large-scale coordinated control of regional power grids, the main coordinated strategies at home and abroad are as follows:

1) Unity of physical control areas: it is to combine multiple (two or more) control areas to form a new large control area, and dispatch business to a dispatching organization in a certain area, or set up another dispatching organization to be responsible For the active power balance task of the entire network, the dispatching organization still adopts conventional planning and control methods, but the scope of power is larger and more resources can be mobilized. This is equivalent to expanding the scope of the control area. Under the control mode of the sub-center (sub-division dispatching center) in my country, it is similar to the integration of sub-center-provincial dispatching control rights. The dispatching directly controls all units in the area, and the provincial dispatching does not Actual scheduling rights.

2) ACE (Area Control Error, regional control deviation) difference exchange method. This method mainly utilizes the difference of ACE symbols in each region in the interconnected grid in real-time operation. This strategy is to reduce the total adjustment amount according to the positive or negative of AGC and load tracking adjustment direction (calling positive reserve or negative reserve). This is mainly because the adjustment direction of some regional settings is not the same as that of ACE. In some control areas, in order to meet the CPS (Control Performance Standard, Control Performance Standard) standard, there may be behaviors that pursue the opposite direction of regulation.

The above two methods are currently mainly used in foreign power market environments. The first method is mainly to realize multi-regional coordinated control from the policy and mechanism of electric power active power regulation. This coordinated control method is to take back the subordinate's regulation and control power to the superior dispatching, which is not suitable for my country's existing hierarchical dispatching and sub-provincial dispatching. Balanced scheduling status. The second method is mainly used in the market environment to reduce the unnecessary adjustment and frequency fluctuation of the unit through the reverse offset of the control interval ACE. This multi-regional coordination strategy is limited to reducing the adjustment of the unit, and does not mobilize all from the perspective of reducing the backup of the entire network. resources to ensure the safety of grid operation.

Contents of the invention

The purpose of the present invention is to: in view of the insufficient backup of the grid regulation caused by the full consumption of new energy after the large-scale grid-connected operation of the new energy in the current power grid, or the insufficient backup of some provincial power grids during the peak load period in summer, the use of distributed The adjustment and planning of the provinces in the whole network are considered in the overall planning, and the adjustment and backup of the provinces in the whole network are coordinated and allocated through the automatic fusion of adjacent control areas. The control area of the regulation ability realizes the real-time sharing of the regulation reserve among the control areas, maximizes the use of the AGC regulation ability of the whole network, promotes the consumption of new energy in the whole network, and ensures the operation safety of the power grid.

In order to achieve the above object, the present invention is achieved by taking the following technical solutions:

A method for controlling the real-time shared AGC of the province-level control area of an interconnected power grid, comprising the following steps:

1) Establish the main control area in the AGC (Automatic Generation Control, AGC) application of the sub-dispatch center (hereinafter referred to as sub-dispatch), and implement the active power control of the sub-dispatching overall area; All provincial-level control areas within the scope serve as provincial-level AGCs;

2) The model of the provincial control area includes a frequency model and a tie line model. Each provincial control area uses the same frequency measurement point (in AGC, each data point is called a measurement, and each measurement has several measuring points), the actual measurement model of the tie line and the planned measurement model of the tie line in the tie line model both adopt the modeling method with positive output;

3) The sub-dispatching AGC calculates the ACE (Area Control Error, regional control deviation) of each provincial control area according to the TBC (Tie-Line Bias Control, tie-line deviation control) mode, and transmits the ACE of the provincial control area in real time through telemetry forwarding Send to each provincial control area, and the provincial control area AGC controls ACE;

4) During the real-time control process, each provincial-level AGC counts and calculates the adjustment reserves of their respective control areas in real time. The statistical calculation method is formula (1), and sends it to the sub-dispatching AGC in real time:

In the formula: R _up is the up-regulation reserve of the control area, G _i-up-limit is the upper limit of the adjustment of unit i, G _i-gen is the actual output of unit i, R _down is the down-regulation reserve of the control area, G _{i- down_limit} is the adjustment lower limit of unit i, n is the total number of AGC units in the control area;

5) The sub-dispatcher monitors the adjustment and backup of each provincial AGC in real time, and counts the backup status of each provincial power grid according to the load/standby ratio;

6) When a provincial power grid has insufficient up-regulation reserve due to high load, or insufficient down-regulation reserve due to large new energy power generation in the grid, apply for regulation reserve sharing;

7) When the branch dispatching center monitors that the original adjustment reserve is insufficient and the control area reserve exceeds the recovery threshold, the control of the virtual control area is released, and the ACE of each control area is calculated according to the original TBC mode and sent to the control area for control;

8) In the process of merging the control areas, the branch dispatching center evaluates the control areas by using the A standard or CPS standard according to the ACE and the overall frequency of the power grid actually issued to the AGCs of each provincial control area.

The control objective of the main control area is to maintain the frequency of the power grid within the control range, or to maintain the exchange power between this control area and other adjacent control areas at a given planned value, or to meet the above two control objectives at the same time; the provincial AGC control objective is Maintain the frequency of the province's power grid within the control range, or maintain the exchange power between the province's control area and other adjacent control areas at a given planned value, or meet the above two control objectives at the same time.

The adjustment standby sharing application described in step (6) includes:

(61) Apply by the subordinate dispatching phone, and the dispatcher of the branch dispatching center will start the real-time sharing function of the adjustment backup after reviewing and passing;

(62) According to the agreed automatic start-up mechanism, the sub-dispatch AGC automatically starts the inter-provincial adjustment and backup real-time sharing strategy according to the backup situation of each province.

Alternative real-time sharing strategies for inter-provincial regulation include:

(71) Dispatch AGC first judges the position of the insufficient control area A for adjusting the reserve, preferentially selects the adjacent control area to adjust the maximum control area B for the reserve, automatically adds a virtual merged control area (A+B), and the overall adjustment reserve is controlled by A The sum of the regulation reserve of the zone and the regulation reserve of the B control zone;

(72) The calculation method of the control area ACE of the newly constructed merged control area (A+B) is shown in formula (2):

ACE _A+B = ACE _A +ACE _B (2)

In the formula: ACE _A+B is the ACE of the combined control area (A+B), ACE _A is the ACE of the control area A, and ACE _B is the ACE of the control area B;

(73) After calculating the ACE of the merged control area, control according to the predefined ACE allocation strategy.

ACE allocation strategies include:

(81) Allocation strategy 1: If the adjustment reserve in control area A is insufficient, adjust all control area A to the upper limit of adjustment (when the upper reserve is insufficient) or to the lower limit of adjustment (when the lower reserve is insufficient), the remaining adjustment responsibility of the control area A All are assumed by the B control area, the ACE of the control area A is set to 0, and the ACE of the merged control area (A+B) is the sum of the ACEs of the two control areas (control area A and controller B);

(82) Allocation strategy 2: Allocate the overall ACE (the ACE of the combined control area (A+B)) to each of the two control areas (control area A and controller B) according to the adjusted reserve ratio, and the calculation method is shown in the following formula:

In the formula: ACE' _A is the modified ACE of control area A, ACE _(A+B) is the ACE of the control area combined with control area (A+B), ACE' _B is the modified ACE of control area B, R _A is The adjustment reserve of control area A, RA _{+B is} the general adjustment reserve of the combined control area (A+B), and RB is the adjustment reserve of control area B.

Step 8) specifically includes:

Standard A is used for assessment: after the control area is merged, if the allocation strategy 1 is used for ACE allocation, the A1 index will not be assessed; the A2 index ACE average value assessment threshold Ld of the merged control area (referring to the control area A) is divided according to the spare margin Segment value, the A2 index ACE average assessment threshold of the main merged control area (control area B) is segmented according to the Ld of the merged control area;

The CPS standard is used for assessment. During the merger control period of the control area, the CPS1 index of the merged control area is not assessed, and the CPS1 assessment index calculation of the main merged control area is calculated according to the total B coefficient of the merged control area; the CPS2 index of the merged control area The assessment threshold L10 is valued in segments according to the spare margin, and the CPS2 assessment threshold L10 of the main merged control area is valued in segments corresponding to the merged control area L10.

The beneficial effects achieved by the present invention: the provincial control area of the interconnected grid proposed by the present invention adjusts and reserves the real-time shared AGC control method, which is applied to the real-time control of dispatching AGC, focusing on the sharing of the entire network's regulation and reserve, as well as the safety of frequency and power grid operation; Through the two-level coordinated control of sub-regulation and provincial regulation, the real-time sharing of backup can be realized in a wider range. Through the real-time sharing and hierarchical call of each provincial regulation and regulation backup, the consumption of new energy by the power grid can be guaranteed in a wider range. and the safe and stable operation of the power grid.

Description of drawings

FIG. 1 is a schematic diagram of a model of an AGC control method for regulating and standby real-time shared AGC in a provincial control area of an interconnected power grid according to the present invention.

Detailed ways

The technical scheme of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

As shown in Fig. 1, the present invention will be further described below in conjunction with Fig. 1 .

A kind of AGC control method that the province-level control area of interconnected power grid regulates standby real-time sharing, comprises the following steps,

1) Establish the main control area in the application of AGC (Automatic Generation Control, automatic generation control, AGC) in the branch dispatching center (hereinafter referred to as sub-dispatching), and implement the active power control of the distribution and adjustment overall area. The control goal of the main control area is to maintain the power grid The frequency is within the control range, or the exchange power between this control area and other adjacent control areas is maintained at a given planned value, or the above two control objectives are met at the same time;

In the sub-dispatching AGC application, all provincial-level control areas within the scope of sub-dispatching and regulating tubes are established as provincial AGCs. The provincial AGC control goal is to maintain the frequency of the provincial power grid within the control range, or maintain the provincial control area and other adjacent control areas. The exchange power is a given planned value, or the above two control objectives are satisfied at the same time.

2) The model of the provincial control area includes a frequency model and a tie line model. Each provincial control area uses the same frequency measurement point (in AGC, each data point is called a measurement, and each measurement has several measuring points), the actual measurement model of the tie line and the planned measurement model of the tie line in the tie line model both adopt the modeling method with positive output;

3) Under normal circumstances, the sub-dispatching AGC calculates the ACE (Area Control Error, regional control deviation) of each provincial control area according to the TBC (Tie-Line Bias Control, Tie-Line Bias Control) mode, and then forwards the provincial The ACE of the provincial control area is sent to each provincial control area in real time, and the AGC of the provincial control area controls the ACE;

4) During the real-time control process, each provincial-level AGC makes real-time statistics on the adjustment reserves of their respective control areas. The statistical calculation method is formula (1), and is sent to the sub-dispatch AGC in real time:

In the formula: R _up is the up-regulation reserve of the control area, G _i-up-limit is the upper limit of the adjustment of unit i, G _i-gen is the actual output of unit i, R _down is the down-regulation reserve of the control area, G _{i- down_limit} is the adjustment lower limit of unit i, n is the total number of AGC units in the control area;

5) The sub-dispatcher monitors the adjustment and backup of each provincial AGC in real time, and counts the backup status of each provincial power grid according to the load/standby ratio;

6) When a provincial power grid has insufficient up-regulation reserve due to high load, or insufficient down-regulation reserve due to large new energy power generation in the grid, the following methods can be used to apply for regulation reserve sharing:

(61) Apply by the subordinate dispatching phone, and the dispatcher of the branch dispatching center will start the real-time sharing function of the adjustment backup after reviewing and passing;

(62) According to the agreed automatic start function, the sub-dispatch AGC automatically starts the inter-provincial adjustment and backup real-time sharing strategy according to the backup situation of each province;

7) The inter-provincial adjustment backup real-time sharing strategy is as follows:

(71) Dispatch AGC first judges the position of the insufficient control area A for adjusting the reserve, preferentially selects the adjacent control area to adjust the maximum control area B for the reserve, automatically adds a virtual merged control area (A+B), and the overall adjustment reserve is controlled by A The sum of the regulation reserve of the zone and the regulation reserve of the B control zone;

(72) The calculation method of the control area ACE of the newly constructed merged control area (A+B) is shown in formula (2):

ACE _A+B = ACE _A +ACE _B (2)

In the formula: ACE _A+B is the ACE of the combined control area, ACE _A is the ACE of the control area, and ACE _B is the ACE of the control area B;

(73) After calculating the ACE of the combined control area, control according to the predefined ACE allocation strategy:

8) ACE allocation strategy includes:

(81) One of the ACE allocation strategies is: if the adjustment reserve in the A control area is insufficient, first adjust all the A control area to the upper limit of the adjustment (when the upper reserve is insufficient) or to the lower limit of the adjustment (when the lower reserve is insufficient), and the A control area The rest of the adjustment responsibility is all assumed by the B control area, the ACE of the A control area is set to 0, and the ACE of the (A+B) control area is the sum of the ACEs of the two control areas;

(82) The second ACE allocation strategy is to allocate the overall ACE to each of the two control areas according to the adjustment reserve ratio. The calculation method is as follows:

In the formula: ACE' _A is the revised ACE of the A control area, ACE _(A+B) is the ACE of the merged control area (A+B), ACE' _B is the revised ACE of the B control area, R _A is The adjustment reserve of control area A, R _A+B is the general adjustment reserve of the combined control area (A+B), and R _B is the adjustment reserve of control area B;

After obtaining the ACEs of control area A and control area B according to different allocation strategies, the telemetry distribution channel is issued to each control area for execution by each control area;

9) When the sub-center monitors that the original adjustment reserve is insufficient and the control area reserve exceeds the recovery threshold, it will automatically cancel the control of the virtual control area, and the ACE of each control area will still be calculated according to the original TBC mode and sent to the control area for control;

10) In the process of merging the control areas, the branch dispatching center evaluates the control areas according to the ACE and the overall frequency of the power grid actually issued to the AGCs of each provincial control area using the A standard or the CPS standard.

101) If A standard is used for assessment: after the merger of the control areas, if the allocation strategy (1) is used for ACE allocation, the A1 indicator will not be assessed. The A2 index ACE average value assessment threshold Ld of the merged control area (controller A, control area B) is selected according to the backup margin segmented value, and the A2 index ACE average value evaluation of the main merged control area (merged controller A+B) The threshold is valued in segments according to the merged control area Ld;

102) If the CPS standard is used for assessment, during the merger control period of the control area, the CPS1 index of the merged control area will not be assessed, and the calculation of the CPS1 assessment index of the main merged control area will be calculated according to the total B coefficient of the merged control area. The CPS2 index assessment threshold L10 of the merged control area is valued in segments according to the spare margin, and the CPS2 assessment threshold L10 of the main merged control area is valued in segments according to the L10 of the merged control area.

In step 5), the sub-dispatcher monitors the adjustment reserve of AGC in each province in real time, and counts the reserve situation of each provincial power grid according to the load/reserve ratio; When the new energy power generation is too large and the down-regulation backup is insufficient, the sub-center dispatcher can apply through the phone call, and the sub-center dispatcher will start the real-time sharing function of the regulation backup after the approval, or according to the pre-agreed automatic start function, the sub-center AGC will automatically adjust according to the provincial backup. The situation automatically starts the real-time sharing function of inter-provincial adjustment and backup;

In step 7), the sub-center AGC first judges the position of the insufficient control area for adjusting the reserve, preferentially selects the adjacent control area to adjust the maximum control area for the reserve, and then automatically adds a virtual merged control area. The overall adjustment reserve of the control area is two The control area adjusts the sum of spares. The ACE calculation method of the newly constructed combined control area (A+B) is shown in formula (2). After the ACE of the combined control area is calculated, the ACE control strategy is carried out.

The above are only preferred embodiments of the present invention, and it should be pointed out that for those of ordinary skill in the art, some improvements and modifications can also be made without departing from the principles of the present invention, and these improvements and modifications should also be considered Be the protection scope of the present invention.

Claims (6)

1. a kind of interconnected power grid provincial control area regulates standby real-time shared AGC control method, it is characterized in that, comprises the following steps: 1) Establish the main control area in the AGC application of the branch dispatching center (hereinafter referred to as sub-dispatching), and implement the active power control of the sub-dispatching overall area; in the sub-dispatching AGC, establish all provincial control areas within the sub-dispatching control area as provincial AGC; 2) The model of the provincial control area includes a frequency model and a tie line model. Each provincial control area uses the same frequency measurement point, and the actual measurement model of the tie line and the planned measurement model of the tie line in the tie line model are both Adopt a modeling approach with a positive output; 3) The dispatching AGC calculates the ACE of each provincial control area according to the TBC mode, and sends the ACE of the provincial control area to each provincial control area in real time through telemetry forwarding, and the provincial control area AGC controls the ACE; 4) During the real-time control process, each provincial-level AGC counts and calculates the adjustment reserves of their respective control areas in real time. The statistical calculation method is formula (1), and sends it to the sub-dispatching AGC in real time: In the formula: R _up is the up-regulation reserve of the control area, G _i-up-limit is the upper limit of the adjustment of unit i, G _i-gen is the actual output of unit i, R _down is the down-regulation reserve of the control area, G _{i- down_limit} is the adjustment lower limit of unit i, n is the total number of AGC units in the control area; 5) The sub-dispatcher monitors the adjustment and backup of each provincial AGC in real time, and counts the backup status of each provincial power grid according to the load/standby ratio; 6) When a provincial power grid has insufficient up-regulation reserve due to high load, or insufficient down-regulation reserve due to large new energy power generation in the grid, apply for regulation reserve sharing; 7) When the branch dispatching center monitors that the original adjustment reserve is insufficient and the control area reserve exceeds the recovery threshold, the control of the virtual control area is released, and the ACE of each control area is calculated according to the original TBC mode and sent to the control area for control; 8) In the process of merging the control areas, the branch dispatching center evaluates the control areas by using the A standard or CPS standard according to the ACE and the overall frequency of the power grid actually issued to the AGCs of each provincial control area. 2. a kind of interconnected power grid provincial control area according to claim 1 adjusts standby real-time sharing AGC control method, it is characterized in that, The control objective of the main control area is to maintain the frequency of the power grid within the control range, or to maintain the exchange power between this control area and other adjacent control areas at a given planned value, or to meet the above two control objectives at the same time; the provincial AGC control objective is Maintain the frequency of the province's power grid within the control range, or maintain the exchange power between the province's control area and other adjacent control areas at a given planned value, or meet the above two control objectives at the same time. 3. according to claim 1, a kind of interconnected power grid province-level control area regulates standby real-time sharing AGC control method, it is characterized in that, The adjustment standby sharing application described in step (6) includes: (61) Apply by the subordinate dispatching phone, and the dispatcher of the branch dispatching center will start the real-time sharing function of the adjustment backup after reviewing and passing; (62) According to the agreed automatic start-up mechanism, the sub-dispatch AGC automatically starts the inter-provincial adjustment and backup real-time sharing strategy according to the backup situation of each province. 4. according to claim 3, a kind of interconnected power grid province-level control area regulates standby real-time sharing AGC control method, it is characterized in that, Alternative real-time sharing strategies for inter-provincial regulation include: (71) Dispatch AGC first judges the position of the insufficient control area A for adjusting the reserve, preferentially selects the adjacent control area to adjust the maximum control area B for the reserve, automatically adds a virtual merged control area (A+B), and the overall adjustment reserve is controlled by A The sum of the regulation reserve of the zone and the regulation reserve of the B control zone; (72) The calculation method of the control area ACE of the newly constructed merged control area (A+B) is shown in formula (2): ACE _A+B = ACE _A +ACE _B (2) In the formula: ACE _A+B is the ACE of the combined control area (A+B), ACE _A is the ACE of the control area A, and ACE _B is the ACE of the control area B; (73) After calculating the ACE of the merged control area, control according to the predefined ACE allocation strategy. 5. according to claim 4, a kind of interconnected power grid provincial control area regulates backup real-time sharing AGC control method, it is characterized in that, ACE allocation strategies include: (81) Allocation strategy 1: If the adjustment reserve of control area A is insufficient, adjust all control area A to the upper limit of adjustment or all adjustment to the lower limit of adjustment, and the remaining adjustment responsibilities of control area A will be borne by control area B, and the ACE of control area A Set to 0, the ACE of the combined control area (A+B) is the sum of the ACEs of control area A and controller B; (82) Allocation strategy 2: Allocate the ACEs in the merged control area (A+B) to each of the two control areas (control area A and controller B) according to the adjusted reserve ratio. The calculation method is shown in the following formula: In the formula: ACE' _A is the modified ACE of control area A, ACE _(A+B) is the ACE of the control area combined with control area (A+B), ACE' _B is the modified ACE of control area B, R _A is The adjustment reserve of control area A, RA _{+B is} the general adjustment reserve of the combined control area (A+B), and RB is the adjustment reserve of control area B. 6. a kind of interconnected power grid provincial control area according to claim 5 regulates standby real-time shared AGC control method, is characterized in that, Step 8) specifically includes: Standard A is used for assessment: after the control area is merged, if the allocation strategy 1 is used for ACE allocation, the A1 index will not be assessed; the A2 index ACE average value assessment threshold Ld of the merged control area is divided according to the spare margin, and the main merger The A2 indicator ACE average value assessment threshold of the control area is divided into sections according to the Ld of the merged control area; The CPS standard is used for assessment. During the merger control period of the control area, the CPS1 index of the merged control area is not assessed, and the CPS1 assessment index calculation of the main merged control area is calculated according to the total B coefficient of the merged control area; the CPS2 index of the merged control area The assessment threshold L10 is valued in sections according to the spare margin, and the CPS2 assessment threshold L10 of the main merged control area is valued in sections according to the corresponding merged control area.