CN112560227B - Simulation rehearsal method for power grid dispatching day-ahead plan - Google Patents
Simulation rehearsal method for power grid dispatching day-ahead plan Download PDFInfo
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Abstract
The invention relates to a power grid dispatching day-ahead plan simulation rehearsal method, which comprises the following steps of 1) generating a power generation curve, a load curve and a maintenance operation event table for power grid simulation; generating a power grid simulation expected fault event table; generating a day-ahead plan simulation teaching plan; 2) starting a power grid training simulation system according to the day-ahead plan simulation teaching plan, setting power grid operation mode changes according to a power grid simulation overhaul operation event table, and completing simulation load flow calculation according to power grid power generation and load values set by a power grid simulation unit output table and a power grid simulation load tidal current table; triggering simulation faults according to a power grid simulation expected fault event table, simulating the power grid fault condition, and completing simulation load flow calculation after fault setting; 3) and saving the simulation power flow sections according to a set period, and calling power flow calculation and N-1 scanning functions to give the power grid operation risk of each simulation preview section. The invention improves the safety of scheduling operation.
Description
Technical Field
The invention belongs to the field of electric power system dispatching automation, and particularly relates to a power grid dispatching day-ahead plan simulation rehearsal method.
Background
The dispatching of the electric power system in China generally needs to make a day-ahead dispatching plan, including a day-ahead power generation plan, a maintenance plan and the like. When the system runs in real time, normal operation of the power grid is guaranteed by executing a day-ahead plan. The work such as power grid safety check and the like is already finished in the process of making the day-ahead plan, but the simulation preview function of the power grid dispatching day-ahead plan is lacked, the condition that the power grid sudden fault occurs in the process of executing the day-ahead dispatching plan cannot be simulated, and the possible operation risk is identified. Grid training simulation systems (DTS) have been widely used for routine training and practice of dispatch operators. How to apply a power grid training simulation system (DTS) to simulation rehearsal of a day-ahead scheduling plan and can simulate an emergency state of a power grid and prompt the operation risk of the power grid to become a problem which needs to be solved urgently in scheduling simulation of an interconnected large power grid.
Disclosure of Invention
The invention aims to provide a power grid dispatching day-ahead plan simulation rehearsal method, which improves the safety of dispatching operation.
In order to achieve the purpose, the technical scheme of the invention comprises the following steps:
which comprises the following steps of,
1) generating a power generation curve, a load curve and a maintenance operation event table for power grid simulation; generating a power grid simulation expected fault event table; generating a day-ahead plan simulation teaching plan;
2) starting a power grid training simulation system according to the day-ahead plan simulation teaching plan, setting power grid operation mode changes according to a power grid simulation overhaul operation event table, and completing simulation load flow calculation according to power grid power generation and load values set by a power grid simulation unit output table and a power grid simulation load tidal current table; triggering simulation faults according to a power grid simulation expected fault event table, simulating the power grid fault condition, and completing simulation load flow calculation after fault setting;
3) and saving the simulation power flow sections according to a set period, and calling a power grid power flow calculation and N-1 scanning function to give the power grid operation risk of each simulation power flow section.
Further, in the step 1), generating a power generation curve, a load curve and a maintenance operation event table for power grid simulation according to the power generation plan, the maintenance plan and the load prediction data before the power grid dispatching day according to the initial power grid operation section; and according to the expected accident set by the user, setting the expected fault type and time of the power grid simulation, and generating a power grid simulation expected fault event table.
Further, in step 1), the power generation plan, the overhaul plan and the load prediction data before the power grid dispatching day are obtained in the following manners: acquiring a power generation plan, a maintenance plan and load prediction data of a power grid dispatching day ahead from a power grid dispatching automation system;
the day-ahead power generation plan comprises 96 active plans of all generator sets in the power grid;
the maintenance plan comprises a time plan for switching on and off the disconnecting link;
the load prediction data comprises 96-point active prediction data of all bus loads in the power grid.
Further, in step 1), the power generation curve and the load curve are generated by generating a power grid simulation section at a certain moment.
Furthermore, the generation mode of the power grid simulation section at a certain moment is to acquire plan data with a period of 15 minutes one by one according to the initial power grid operation section and generate the power grid simulation tidal current section at the moment.
Further, the generation of the power grid simulation section at a certain moment comprises the following steps,
s1: on the basis of the initial power grid operation section, setting the active power of all the units as a planned active power value at the moment, and setting the active power of all the loads as an active power predicted value at the moment; calling a power flow calculation program to complete power flow calculation of the planned section at the moment so as to obtain an output power flow active value;
s2: calculating the deviation P between the output power flow active value and the planned active value of the intranet unit in the planned sectionw-acc，Pw-accThe calculation process of (2) is shown in formula (1):
wherein, UPkA planned active value representing the kth intranet generator equipment of the planned section; UL (UL)kThe current active value of the kth intranet generator equipment of the planned section is represented; n represents the number of all intranet generator equipment in the planned section; the intranet generator equipment is a generator set directly controlled by the control center;
s3: calculating the active power correction value delta P of the output of each external network unit in the planned sectionnet-i，ΔPnet-iAs shown in formula (2):
wherein, SPiThe unit capacity value of the ith external network generator equipment of the planned section is represented; m represents the number of all external network generator devices in the planned section, SPtThe unit capacity value of the t external network generator equipment of the planned section is represented; the external network generator equipment refers to a generator set or an equivalent generator set model which is not directly controlled by the control center.
S4: the active power output increase delta P of each external network generator for setting the planned sectionnet-i(ii) a All internal network units are set to be unadjustable, and all external network units are set to be adjustable; calling a load flow calculation program again to complete the load flow calculation of the planned section at the moment; after the load flow calculation is completed, all the internal network units are set to be capableAdjusting; through the steps, the deviation correction between the power generation active plan of the power grid and the load prediction is realized, and the accurate tidal current result at the moment is obtained;
and S5, writing the unit load flow value in the current calculation result at the moment into the power grid simulation unit output table at the corresponding moment, and writing the load flow value into the power grid simulation load current table at the corresponding moment.
Further, the method for acquiring the overhaul operation event table comprises the following steps: setting a switch disconnecting link displacement event in the simulation section according to a time plan of switch disconnecting link action in the maintenance plan, and writing the displacement event into a power grid simulation maintenance operation event table; the switch disconnecting link displacement event comprises switching-on and switching-off information and displacement time.
Furthermore, the switch disconnecting link displacement event comprises opening and closing information and displacement time.
Further, in the step 1), a 96-point power grid simulation unit output table, a 96-point power grid simulation load tidal current table, a power grid simulation overhaul operation event table and a power grid simulation expected fault event table are saved as a planned power grid simulation teaching plan at the day time.
Further, the step 3) comprises the following steps:
3-1) calculating and providing overload equipment and overload equipment of each simulation load flow section through the power grid load flow; counting overload devices and heavy load devices in all simulation preview sections, and giving a sequencing result according to the device counting times; the more the statistics times, the larger the equipment overload risk;
3-2) providing N-1 overload equipment and heavy-load equipment of each simulation preview section through the power grid N-1 scanning function; counting overload devices and overload devices calculated by N-1 in all simulation power flow sections, and giving a sequencing result according to the counting times of the devices; a device with a higher number of statistics indicates a higher risk of heavy overload calculated by the device N-1.
The invention has the following positive effects:
1. according to the invention, the power grid simulation teaching plan is generated by fully utilizing the power grid dispatching day-ahead power generation plan, the maintenance plan and the load prediction data, so that the precision of the day-ahead plan simulation load flow calculation is improved.
2. According to the method, the power grid flow distribution condition under the expected fault is accurately simulated through the simulation of the day-ahead plan and the expected fault of the power grid, the weak link of the power grid plan execution is further determined, and the safety of the dispatching operation is improved.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application. Which comprises the following steps of,
1) generating a power generation curve, a load curve and a maintenance operation event table for power grid simulation; generating a power grid simulation expected fault event table; and generating a daily plan simulation teaching plan.
In the step 1), generating a power generation curve, a load curve and a maintenance operation event table for power grid simulation according to an initial power grid operation section and power grid dispatching day-ahead power generation plan, maintenance plan and load prediction data; and according to the expected accident set by the user, setting the expected fault type and time of the power grid simulation, and generating a power grid simulation expected fault event table.
In the step 1), the power generation plan, the overhaul plan and the load prediction data before the power grid dispatching day are obtained in the following modes: acquiring a power generation plan, a maintenance plan and load prediction data of a power grid dispatching day ahead from a power grid dispatching automation system;
the day-ahead power generation plan comprises 96 active plans of all generator sets in the power grid;
the maintenance plan comprises a time plan for switching on and off the disconnecting link;
the load prediction data comprises 96-point active prediction data of all bus loads in the power grid.
In the step 1), generating the power generation curve and the load curve by generating a power grid simulation section at a certain moment.
And the generation mode of the power grid simulation section at a certain moment is to acquire plan data with a period of 15 minutes one by one according to the initial power grid operation section and generate the power grid simulation tide section at the moment.
The generation of the simulation section of the power grid at a certain moment comprises the following steps,
s1: on the basis of the initial power grid operation section, setting the active power of all the units as a planned active power value at the moment, and setting the active power of all the loads as an active power predicted value at the moment; calling a power flow calculation program to complete power flow calculation of the planned section at the moment so as to obtain an output power flow active value;
s2: calculating the deviation P between the output power flow active value and the planned active value of the intranet unit in the planned sectionw-acc，Pw-accThe calculation process of (2) is shown in formula (1):
wherein, UPkA planned active value representing the kth intranet generator equipment of the planned section; UL (UL)kThe current active value of the kth intranet generator equipment of the planned section is represented; n represents the number of all intranet generator equipment in the planned section; the intranet generator equipment refers to a generator set directly controlled and controlled by the control center;
s3: calculating the active power correction value delta P of the output of each external network unit in the planned sectionnet-i，ΔPnet-iAs shown in formula (2):
wherein, SPiThe unit capacity value of the ith external network generator equipment of the planned section is represented; m meterIndicating the number of all external network generator devices in the planned section, SPtThe unit capacity value of the t external network generator equipment of the planned section is represented; the external network generator equipment refers to a generator set or an equivalent generator set model which is not directly controlled by the control center.
S4: the active power output increase delta P of each external network generator for setting the planned sectionnet-i(ii) a All internal network units are set to be unadjustable, and all external network units are set to be adjustable; calling a load flow calculation program again to complete the load flow calculation of the planned section at the moment; after the load flow calculation is completed, setting all the intranet units to be adjustable; through the steps, the deviation correction between the power generation active plan of the power grid and the load prediction is realized, and the accurate tidal current result at the moment is obtained;
and S5, writing the unit load flow value in the current calculation result at the moment into the power grid simulation unit output table at the corresponding moment, and writing the load flow value into the power grid simulation load current table at the corresponding moment.
The method for acquiring the maintenance operation event list comprises the following steps: setting a switch disconnecting link displacement event in the simulation section according to a time plan of switch disconnecting link action in the maintenance plan, and writing the displacement event into a power grid simulation maintenance operation event table; the switch disconnecting link displacement event comprises switching-on and switching-off information and displacement time.
The switch disconnecting link displacement event comprises switching-on and switching-off information and displacement time.
In the step 1), a 96-point power grid simulation unit output table, a 96-point power grid simulation load tidal current table, a power grid simulation overhaul operation event table and a power grid simulation expected fault event table are stored as a planned power grid simulation teaching plan in the day-ahead.
The structure of the output meter of the power grid simulation unit is shown in the following table 1:
TABLE 1
| Name of field | Description of the field |
| Name of generator set | Device name, 64 byte string |
| Name of affiliated Power plant | Factory site name, 64 byte string |
| 96-point unit active power | Active power output of unit, 96-point floating-point number array |
| 96-point unit reactive power | Group idle output, 96-point floating-point number array |
| Terminal voltage of 96-point unit | Unit terminal voltage per unit value, 96-point floating-point number array |
The structure of the power grid simulation load tidal current table is shown in the following table 2:
TABLE 2
| Name of field | Description of field |
| Load device name | Device name, 64 byte string |
| Name of the transformer substation | Factory site name, 64 byte string |
| 96-point load active power | Load active value, 96-point floating-point number array |
| 96-point load reactive power | Load reactive value, 96-point floating-point number array |
The structure of the power grid simulation overhaul operation event table is shown in the following table 3:
TABLE 3
The structure of the grid simulation predicted fault event table is shown in the following table 4:
TABLE 4
| Name of field | Description of field |
| Device name | Device name, 64 byte string |
| Name of the station | Factory site name, 64 byte string |
| Type of failure | Integer, device operation type enumeration value |
| Faulty integer data | Fault data value, 32-point integer array |
| Faulty floating-point data | Fault data numerical value, 32-point floating point number array |
| Time of failure | Time tag, expected failure time of device |
2) Starting a power grid training simulation system according to the day-ahead plan simulation teaching plan, setting power grid operation mode changes according to a power grid simulation overhaul operation event table, and completing simulation load flow calculation according to power grid power generation and load values set by a power grid simulation unit output table and a power grid simulation load tidal current table; triggering a simulation fault according to a power grid simulation expected fault event table, simulating a power grid fault condition, and completing simulation load flow calculation after fault setting;
3) and saving the simulation power flow sections according to a set period, and calling a power grid power flow calculation and N-1 scanning function to give the power grid operation risk of each simulation power flow section.
The step 3) comprises the following steps:
3-1) calculating and providing overload equipment and overload equipment of each simulation load flow section through the power grid load flow; counting overload devices and heavy load devices in all simulation preview sections, and giving a sequencing result according to the device counting times; the more the statistics times, the greater the equipment represents the heavy overload risk of the equipment;
3-2) providing N-1 overload equipment and heavy-load equipment of each simulation preview section through the power grid N-1 scanning function; counting overload devices and overload devices calculated by N-1 in all simulation power flow sections, and giving a sequencing result according to the counting times of the devices; a device with a higher number of statistics indicates a higher risk of heavy overload calculated by the device N-1.
According to the method, a power generation curve, a load curve and a maintenance operation event table required by power grid simulation are generated according to an initial power grid operation section and a power generation plan, a maintenance plan and load prediction data before the power grid dispatching day; setting the expected fault type and time of power grid simulation according to the expected accident set by a user, and generating a power grid simulation expected fault event table; and saving a 96-point power grid simulation unit output table, a 96-point power grid simulation load current table, a power grid simulation overhaul operation event table and a power grid simulation expected fault event table as a planned power grid simulation teaching plan in the day-ahead. Starting a power grid training simulation system by using a daily plan simulation teaching plan, setting the operation mode change of a power grid according to a power grid simulation overhaul operation event table, and completing simulation load flow calculation according to power grid power generation and load values set by a power grid simulation unit output table and a power grid simulation load tide flow table; and triggering simulation faults according to a power grid simulation anticipated fault event table, simulating the power grid fault condition, and completing the simulation load flow calculation after fault setting. And saving the simulation power flow sections according to a set period, and calling power flow calculation and N-1 scanning functions to give the power grid operation risk of each simulation preview section. According to the method, the power grid simulation teaching plan is generated by fully utilizing the power grid dispatching day-ahead power generation plan, the maintenance plan and the load prediction data, so that the precision of the day-ahead plan simulation load flow calculation is improved; by simulating the day-ahead plan and the expected faults of the power grid, the power grid flow distribution condition under the expected faults is accurately simulated, weak links of the power grid plan execution are further determined, and the safety level of dispatching operation is improved.
The invention provides a power grid dispatching day-ahead plan simulation rehearsal method. The method realizes simulation rehearsal of the day-ahead scheduling plan of the power grid, accurately simulates the running state of the power grid executed by the day-ahead scheduling plan, improves the risk prejudgment and identification capability of the large-scale interconnected power grid, and enhances the safe and economic running level of the power grid.
Specifically, as shown in fig. 1, firstly, initial operation sections and day-ahead plan data are obtained, then a simulation teaching plan is generated according to the plan data, a simulation system is driven to operate, an event table is automatically executed, simulation sections after simulation power grid events are executed are periodically stored, and finally, N-1 scanning is performed to clearly determine simulation section operation risks.
The invention provides a power grid dispatching day-ahead plan simulation rehearsal method, which has the following advantages:
1. according to the power grid dispatching day-ahead plan simulation rehearsal method, the power grid dispatching day-ahead power generation plan, the maintenance plan and the load prediction data are fully utilized to generate the power grid simulation teaching plan, and the precision of the day-ahead plan simulation load flow calculation is improved.
2. According to the method, the power grid flow distribution condition under the expected fault is accurately simulated through the simulation of the day-ahead plan and the expected fault of the power grid, the weak link of the power grid plan execution is further determined, and the safety of the dispatching operation is improved.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A power grid dispatching day-ahead plan simulation rehearsal method is characterized in that: which comprises the following steps of,
1) generating a power generation curve, a load curve and a maintenance operation event table for power grid simulation; generating a power grid simulation expected fault event table; generating a day-ahead plan simulation teaching plan;
2) starting a power grid training simulation system according to the day-ahead plan simulation teaching plan, setting power grid operation mode changes according to a power grid simulation overhaul operation event table, and completing simulation load flow calculation according to power grid power generation and load values set by a power grid simulation unit output table and a power grid simulation load tidal current table; triggering a simulation fault according to a power grid simulation expected fault event table, simulating a power grid fault condition, and completing simulation load flow calculation after fault setting;
3) saving the simulation power flow sections according to a set period, and calling a power grid power flow calculation and N-1 scanning function to give a power grid operation risk of each simulation power flow section;
in the step 1), generating a power generation curve, a load curve and a maintenance operation event table for power grid simulation according to an initial power grid operation section and power grid dispatching day-ahead power generation plan, maintenance plan and load prediction data; setting the expected fault type and time of power grid simulation according to the expected accident set by a user, and generating a power grid simulation expected fault event table;
in the step 1), generating the power generation curve and the load curve by generating a power grid simulation section at a certain moment;
the generation mode of the power grid simulation section at a certain moment is to acquire plan data with a period of 15 minutes one by one according to the initial power grid operation section and generate the power grid simulation tide section at the moment;
the generation of the simulation section of the power grid at a certain moment comprises the following steps,
s1: on the basis of the initial power grid operation section, setting the active power of all the units as a planned active power value at the moment, and setting the active power of all the loads as an active power predicted value at the moment; calling a power flow calculation program to complete power flow calculation of the planned section at the moment so as to obtain an output power flow active value;
s2: calculating the deviation P between the output power flow active value and the planned active value of the intranet unit in the planned sectionw-acc，Pw-accThe calculation process of (2) is shown in formula (1):
wherein, UPkA planned active value representing the kth intranet generator equipment of the planned section; UL (UL)kThe current active value of the kth intranet generator equipment of the planned section is represented; n represents the number of all internal network generator devices in the planned section; the intranet generator equipment is a generator set directly controlled by a control center;
s3: calculating the active power correction value delta P of the output of each external network unit in the planned sectionnet-i，ΔPnet-iAs shown in formula (2):
wherein, SPiShowing the planned cross sectionThe unit capacity values of the i external network generator devices; m represents the number of all external network generator devices in the planned section, SPtThe unit capacity value of the t-th external network generator equipment of the planned section is represented; the external network generator equipment refers to a generator set or an equivalent generator set model which is not directly controlled by a control center;
s4: the active power output increase delta P of each external network generator for setting the planned sectionnet-i(ii) a All internal network units are set to be unadjustable, and all external network units are set to be adjustable; calling a load flow calculation program again to complete the load flow calculation of the planned section at the moment; after the load flow calculation is completed, setting all the intranet units to be adjustable; through the steps, the deviation correction between the power generation active plan of the power grid and the load prediction is realized, and the accurate tidal current result at the moment is obtained;
and S5, writing the unit load flow value in the current calculation result at the moment into the power grid simulation unit output table at the corresponding moment, and writing the load flow value into the power grid simulation load current table at the corresponding moment.
2. The power grid dispatching day-ahead plan simulation rehearsal method according to claim 1, characterized in that: in the step 1), the power generation plan, the overhaul plan and the load prediction data before the power grid dispatching day are obtained in the following modes: acquiring a power generation plan, a maintenance plan and load prediction data of a power grid dispatching day ahead from a power grid dispatching automation system;
the day-ahead power generation plan comprises 96 active plans of all generator sets in the power grid;
the maintenance plan comprises a time plan for switching on and off the disconnecting link;
the load prediction data comprises 96-point active prediction data of all bus loads in the power grid.
3. The power grid dispatching day-ahead plan simulation rehearsal method according to claim 1, characterized in that: the method for acquiring the maintenance operation event list comprises the following steps: setting a switch disconnecting link displacement event in the simulation section according to a time plan of switch disconnecting link action in the maintenance plan, and writing the displacement event into a power grid simulation maintenance operation event table; the switch disconnecting link displacement event comprises switching-on and switching-off information and displacement time.
4. The power grid dispatching day-ahead plan simulation rehearsal method according to claim 3, characterized in that: the switch disconnecting link displacement event comprises switching-on and switching-off information and displacement time.
5. The power grid dispatching day-ahead plan simulation rehearsal method according to claim 1, characterized in that: in the step 1), a 96-point power grid simulation unit output table, a 96-point power grid simulation load tidal current table, a power grid simulation overhaul operation event table and a power grid simulation expected fault event table are stored as a planned power grid simulation teaching plan in the day-ahead.
6. The power grid dispatching day-ahead plan simulation rehearsal method according to claim 1, characterized in that: the step 3) comprises the following steps:
3-1) calculating and providing overload equipment and overload equipment of each simulation load flow section through the power grid load flow; counting overload devices and heavy-load devices in all simulation preview sections, and giving a sequencing result according to the device counting times; the more the statistics times, the larger the equipment overload risk;
3-2) providing N-1 overload equipment and heavy-load equipment of each simulation preview section through the power grid N-1 scanning function; counting overload devices and overload devices calculated by N-1 in all simulation power flow sections, and giving a sequencing result according to the counting times of the devices; a device with a higher number of statistics indicates a higher risk of heavy overload calculated by the device N-1.
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