CN114498775B - Method and system for automatically controlling active power of hydraulic power plant - Google Patents
Method and system for automatically controlling active power of hydraulic power plant Download PDFInfo
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- CN114498775B CN114498775B CN202210335957.6A CN202210335957A CN114498775B CN 114498775 B CN114498775 B CN 114498775B CN 202210335957 A CN202210335957 A CN 202210335957A CN 114498775 B CN114498775 B CN 114498775B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
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Abstract
The invention provides a method and a system for automatically controlling active power of a hydraulic power plant, wherein the method comprises the following steps: acquiring real-time monitoring data of a power plant; and selecting a power plant AGC working mode according to the monitoring data, wherein the power plant AGC working mode comprises a frequency modulation working mode and a total power regulation working mode, and the total power regulation working mode comprises a primary total power regulation working mode and a secondary total power regulation working mode. Based on the total power regulation working mode, the total power is taken as a regulation object, and the target power of the unit is taken as the basic power plus the regulation power. And setting a first-stage total power regulation working mode and a second-stage total power regulation working mode on the basis of considering the regulation dead zone. Therefore, a proper control logic is set for each section of working condition, and the influence of the total regulation deviation on the active power regulation and the unit operation is effectively reduced.
Description
Technical Field
The invention relates to the technical field of power generation of hydraulic power plants, in particular to a method and a system for automatically controlling active power of a hydraulic power plant.
Background
Data acquisition and Supervisory Control (SCADA) is the basic function of a grid dispatching automation system or a plant computer monitoring system, and AGC/AVC is its advanced function. The automatic AGC/AVC of power grid dispatching and the AGC/AVC of a power plant (step dispatching only AGC) control the active power and the reactive power of the power plant through an automatic means, but the task and the starting point are different.
The power grid AGC also controls the power of the network area tie line besides requiring the system frequency to be stable, and ensures the stable operation of each network area. And the AGC autonomously adjusts the generating power of the main power frequency modulation power plant according to the system frequency deviation and the tie line power deviation, and eliminates the frequency deviation and the exchange power deviation.
The AGC of the hydroelectric power plant determines the optimal combination (the number and the number of the units) of the cascade power plant load and the operation of each hydroelectric power plant unit according to the principle of economic operation on the premise of ensuring the safe operation of the power plant and meeting the load requirement of a power grid, and realizes the economic distribution and the real-time control of the load among the units through the optimal combination. To achieve power balance of the system, the grid AGC should dominate the cascade scheduling and the plant AGC.
The Automatic Generation Control (AGC) is a technology for automatically controlling the active power of a hydropower station to meet the system requirement in a rapid and economic way according to preset conditions and requirements, and is a way for realizing the full-field automation of the hydropower station. The method mainly comprises five functions of load frequency control, economic dispatching control, reserve capacity monitoring, active power automatic control performance monitoring, tie line deviation control and the like.
The water flow inertia and the unit inertia play a degrading role in regulating the active power of the water turbine generator set, and the water turbine generator set speed regulator has certain deviation in regulating precision due to various reasons such as design, model selection, installation, overhaul, debugging, operation management, stability setting of the speed regulator and the like, namely the unit speed regulator has certain regulating dead zones. Although the plant layer AGC is provided with an adjusting dead zone according to the precision requirement and the stability requirement of active power adjustment, the total adjusting deviation of a plurality of adjusting units still can influence the active power adjustment and the unit operation.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defect that it is difficult to cope with the influence of the dead regulation zone on the active power regulation and the unit operation in the prior art, thereby providing a method and a system for automatically controlling the active power of a hydraulic power plant.
In a first aspect, an embodiment of the present invention provides an automatic control method for active power of a hydraulic power plant, including: acquiring real-time monitoring data of a power plant; and selecting a power plant AGC working mode according to the monitoring data, wherein the power plant AGC working mode comprises a frequency modulation working mode and a total power regulation working mode, and the total power regulation working mode comprises a primary total power regulation working mode and a secondary total power regulation working mode.
Optionally, when the AGC operation mode of the power plant is set to the fm operation mode, the method for automatically controlling the active power of the hydraulic power plant includes: acquiring a scheduling instruction issued by a power grid AGC; calculating the number of the startup units and the shutdown units according to the scheduling instruction and the rated power of the units, and sequentially selecting the startup units and the shutdown units of the frequency modulation units according to the calculation result; calculating a frequency control deviation value according to the real-time monitoring data; converting the frequency control deviation value into corresponding control power; and averagely distributing the control power to each set participating in frequency modulation, and controlling each set to regulate the power.
Optionally, the method for automatically controlling active power of a hydraulic power plant further includes: acquiring the actual power of each unit participating in frequency modulation in real time; when the actual power of the unit is larger than a preset upper limit value, outputting a power down-regulation instruction to the unit; and when the actual power of the unit is smaller than a preset lower limit value, outputting a power up-regulation instruction to the unit.
Optionally, when the plant AGC operation mode is set to the total power regulation operation mode, the method for automatically controlling the active power of the hydraulic power plant includes: acquiring a scheduling instruction issued by a power grid AGC or a set power generation power of a power plant; calculating an adjusting power deviation value according to the real-time monitoring data; when the adjusting power deviation value is in a first adjusting area, setting the AGC working mode as a primary total power adjusting working mode; and when the regulating power deviation value is in a second regulating area, setting the AGC working mode into a two-stage total power regulating working mode, wherein the first regulating area is larger than a preset dead zone and smaller than the second regulating area.
Optionally, when the plant AGC operation mode is set to the primary total power regulation operation mode, the method for automatically controlling the active power of the hydraulic power plant includes: calculating the number of the starting and stopping units according to the scheduling instruction or the set generating power of the power plant and the rated power of the units, and sequentially selecting total power AGC to regulate the starting and stopping of the units according to the calculation result; distributing adjusting loads to all units participating in active power automatic control power adjustment according to the adjusting power deviation value; acquiring the actual power of each unit in real time; when the actual power of the unit is larger than a preset lower limit value, automatically putting active power automatic control into use, and issuing a regulation load to an active power automatic control power regulation unit which runs in a limited grouping unidirectional distribution mode; when the actual power of the unit is larger than a preset upper limit value, outputting a power down-regulation instruction to the unit; and when the actual power of the unit is smaller than a preset lower limit value, outputting a power up-regulation instruction to the unit.
Optionally, when the actual power of the unit is greater than the preset lower limit, automatically putting into active power automatic control, and issuing a regulation load to the active power automatic control power regulation unit in a limited grouping unidirectional distribution manner, includes: dividing the units participating in the automatic control power regulation of the active power into two groups; distributing the up-regulation instruction to a first group of active power automatic control units, and sending the down-regulation instruction to a second group of active power automatic control units; when the actual power of the first group of active power automatic control units is larger than a preset upper limit value or the actual power of the second group of active power automatic control units is smaller than a preset lower limit value, the down-regulation instruction is distributed to the first group of active power automatic control units, and the up-regulation instruction is issued to the second group of active power automatic control units.
Optionally, when the AGC operation mode of the power plant is set to the total power two-stage regulation operation mode, the method for automatically controlling the active power of the hydraulic power plant includes: calculating the number of the on/off units according to the scheduling instruction or the set generating power of the power plant and the rated power of the unit, and sequentially selecting total power AGC to adjust the on/off of the unit according to the calculation result; distributing adjusting loads to all units participating in active power automatic control power adjustment according to the adjusting power deviation value; acquiring the actual power of each unit in real time; when the actual power of the unit is larger than a preset lower limit value, automatically putting active power automatic control into operation, and averagely distributing the adjusting load to the active power automatic control unit in operation; when the actual power of the unit is larger than a preset upper limit value, outputting a power down-regulation instruction to the unit; and when the actual power of the unit is smaller than a preset lower limit value, outputting a power up-regulation instruction to the unit.
In a second aspect, an embodiment of the present invention provides an automatic active power control system for a hydraulic power plant, including: the acquisition module is used for acquiring real-time monitoring data of the power plant; and the setting module is used for selecting a power plant AGC working mode according to the monitoring data, wherein the power plant AGC working mode comprises a frequency modulation working mode and a total power regulation working mode, and the total power regulation working mode comprises a primary total power regulation working mode and a secondary total power regulation working mode.
In a third aspect, an embodiment of the present invention provides a computer-readable storage medium, where computer instructions are stored, and the computer instructions are configured to cause the computer to execute the method for automatically controlling active power of a hydraulic power plant according to the first aspect of the embodiment of the present invention.
In a fourth aspect, an embodiment of the present invention provides a computer device, including: the hydraulic power plant active power automatic control method comprises a storage and a processor, wherein the storage and the processor are connected with each other in a communication mode, the storage stores computer instructions, and the processor executes the computer instructions so as to execute the hydraulic power plant active power automatic control method according to the first aspect of the embodiment of the invention.
The technical scheme of the invention has the following advantages:
the invention provides a method for automatically controlling active power of a hydraulic power plant, which comprises the following steps: acquiring real-time monitoring data of a power plant; and selecting a power plant AGC working mode according to the monitoring data, wherein the power plant AGC working mode comprises a frequency modulation working mode and a total power regulation working mode, and the total power regulation working mode comprises a primary total power regulation working mode and a secondary total power regulation working mode. Based on the total power regulation working mode, the total power is taken as a regulation object, and the target power of the unit is taken as the basic power plus the regulation power. And setting a first-stage total power regulation working mode and a second-stage total power regulation working mode on the basis of considering the regulation dead zone. Therefore, appropriate control logic is set for each section of working condition, and the influence of total regulation deviation on active power regulation and unit operation is effectively reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a specific example of an automatic control method for active power of a hydraulic power plant according to an embodiment of the present invention;
FIG. 2 is a graph of the contribution of power plant frequency regulation according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an operation regulation area for automatically controlling the active power of a unit according to an embodiment of the present invention;
fig. 4 is a flow chart of the active power automatic control frequency modulation in the embodiment of the present invention;
fig. 5 is a schematic diagram of the active power automatic control total power regulation in the embodiment of the present invention;
fig. 6 is a flow chart of the primary regulation of the active power automatic control total power in the embodiment of the present invention;
fig. 7 is a flow chart of the active power automatic control total power two-stage regulation in the embodiment of the present invention;
fig. 8 is a schematic block diagram of a specific example of an automatic active power control system of a hydraulic power plant according to an embodiment of the present invention;
fig. 9 is a composition diagram of a specific example of a computer device according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be connected through the inside of the two elements, or may be connected wirelessly or through a wire. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
Furthermore, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The embodiment of the invention provides an automatic control method for active power of a hydraulic power plant, which comprises the following steps as shown in figure 1:
step S1: and acquiring real-time monitoring data of the power plant.
In a particular embodiment, real-time monitoring data of the plant is acquired from a plant SCADA (data acquisition and monitoring control System): the total power P sigma of the power generation internet, the real-time power Pg of each unit, the frequency F of the grid-connected voltage monitoring point of the power plant close to the power grid side, and the frequency deviation F; obtaining a system frequency plan deviation F0 from the power grid SCADA; and (4) giving rated power Pe of each unit.
Further, the total reserve capacity of the power plant is calculated according to the real-time monitoring data, the reserve capacity of each unit is calculated, the total active power automatic control reserve capacity is calculated, and the total active power automatic control frequency modulation unit reserve capacity is calculated. And calculating a frequency deviation coefficient B. And calculating the control deviation ACE0 when the frequency deviation is Δ F =0, and taking the control deviation ACE0 as a reference for setting the regulation constant value for constant value comparison and regulation direction. And calculating the contribution value of the active power automatic control frequency modulation unit of the power plant to the system frequency regulation. The ACE value when the frequency plan deviation Δ F0 is considered is calculated. And using the calculation result for automatic control of the active power of the subsequent unit.
Further, the total reserve capacity of the plant is calculated by the following formula: p Σ standby = Pe Σ operable — P Σ. Calculating the spare capacity of a single unit by the following formula: pi spare = Pe-Pg. The active power automatic control total reserve capacity is calculated by the following formula: PAGC total standby = Pe Σ AGC-Pg Σ AGC. The active power automatic control frequency modulation reserve capacity is calculated by the following formula: p fm standby = Pe Σ fm-Pg Σ fm. The frequency deviation coefficient B MW/0.1HZ is taken from the system load curve as shown in fig. 2. The control deviation ACE at which the system takes into account the planned deviation adjustment is calculated by the following formula: ACE =10B (Δ F- Δ F0). Calculating the contribution value of the AGC frequency modulation unit of the power plant to the system frequency adjustment by the following formula: Δ f = PG/B, wherein PG is the total adjusting power of the AGC unit of the power plant during AGC adjustment.
Step S2: and selecting a power plant AGC working mode according to the monitoring data, wherein the power plant AGC working mode comprises a frequency modulation working mode and a total power regulation working mode, and the total power regulation working mode comprises a primary total power regulation working mode and a secondary total power regulation working mode.
In a specific embodiment, the power plant AGC operating mode is selected as the frequency modulation operating mode or the total power regulation operating mode according to the directly monitored data and the data obtained by the subsequent calculation.
In the embodiment of the invention, the AGC working modes of the power plant are divided into a frequency modulation working mode, a primary total power regulation working mode and a secondary total power regulation working mode. When the AGC unit is set as a frequency modulation unit, the AGC unit works in a frequency modulation working mode; when the AGC unit is set to be in a total power regulation working mode, the AGC unit selects a primary or secondary total power regulation working mode according to the size condition of the required total regulation power, and the three working modes adopt different regulation methods.
Further, when the AGC operation mode of the power plant is selected, the power generation operation interval of the generator set is required to be set. Each operation area and the power generation efficiency are related to the power generation head of the generator, so that the unit vibration area is effectively avoided, and the unit can be operated in the optimal economic operation area of the unit as much as possible.
Specifically, according to various operation parameters of a water turbine and a generator given by a manufacturer of the unit, unit vibration regions and efficiency distributions under various operation conditions, such as unit vibration regions and efficiency distributions under different power generation heads, are divided. The generating operation interval of the generating set is set on the basis of the vibration area and the efficiency distribution of the generating set, the generating operation interval is effectively kept away from the vibration area of the generating set and operates in the optimal economic operation area of the generating set as much as possible, and the generating efficiency and the operation crossing the vibration area of the generating set as little as possible are fully considered. As shown in FIG. 3, when the AGC of the power plant exceeds the upper limit and the lower limit of the AGC control, an alarm is given, and the automatic active power control is quitted. The AGC of the power plant controls the automatic control unit of the active power to operate between the upper limit and the lower limit of the unit.
Furthermore, the AGC economic operation mode of the power plant means that the amount of water consumed by the power plant is minimized by optimizing load distribution when the active total output of the power plant is given. Meanwhile, safe operation conditions that the unit cannot operate in a vibration area and the like are also met. The following mathematical model can be established:
constraint conditions are as follows:
Pi∈[Pmin（H），Pmax（H）]③
in the formula (I) and (II), N is the total number of units, Qi (H, Pi) is the water flow when the I-th unit outputs Pi under the water head H. Pmax (H) and Pmin (H) refer to the maximum output and the minimum output of the unit when the water head is H. Among the 3 constraint conditions, the formula II is balance constraint of the whole plant active given value and the real active value, the formula III is limitation constraint of the minimum load and the maximum load of the unit, and the formula IV is constraint of the unit avoiding the vibration area. Mi is the capacity of the ith unit, and Mt is the total capacity of the 1 st unit to the N units. When the water head is H, the active output interval of the j vibration region of the unit is [ Pvmin, j (H) ], Pvmax, j (H) ].
The invention provides a method for automatically controlling active power of a hydraulic power plant, which comprises the following steps: acquiring real-time monitoring data of a power plant; and selecting a power plant AGC working mode according to the monitoring data, wherein the power plant AGC working mode comprises a frequency modulation working mode and a total power regulation working mode, and the total power regulation working mode comprises a primary total power regulation working mode and a secondary total power regulation working mode. And based on the total power regulation working mode, taking the total power as a regulation object, and taking the target power of the unit as the basic power plus the regulation power. And setting a primary total power regulation working mode and a secondary total power regulation working mode on the basis of considering the regulation dead zone. Therefore, a proper control logic is set for each section of working condition, and the influence of the total regulation deviation on the active power regulation and the unit operation is effectively reduced.
In one embodiment, when the AGC operation mode of the power plant is set to the fm operation mode, the method for automatically controlling the active power of the hydraulic power plant includes the following steps:
step S211: and acquiring a dispatching instruction issued by the power grid AGC.
Step S212: and calculating the number of the startup units and the shutdown units according to the scheduling instruction and the rated power of the units, and sequentially selecting the startup units and the shutdown units of the frequency modulation units according to the calculation result.
Step S213: and calculating a frequency control deviation value according to the real-time monitoring data.
Step S214: and converting the frequency control deviation value into corresponding control power.
Step S215: and averagely distributing the control power to each set participating in frequency modulation, and controlling each set to regulate the power.
In an embodiment, the method for automatically controlling the active power of the hydraulic power plant further includes:
step S216: acquiring the actual power of each unit participating in frequency modulation in real time;
step S217: when the actual power of the unit is larger than a preset upper limit value, outputting a power down-regulation instruction to the unit;
step S218: and when the actual power of the unit is smaller than the preset lower limit value, outputting a power up-regulation instruction to the unit.
In the embodiment of the invention, the frequency modulation working mode is constant frequency adjustment without difference. In the power grid, large or ultra-large hydroelectric generating sets with large regulating capacity are generally considered to undertake the frequency modulation task, require relatively rapid regulation output and undertake the regulation task in a certain frequency modulation range. During adjustment, the power grid AGC converts the frequency control deviation ACE into control power through calculation, distributes the control power to each power plant according to a certain proportion, and evenly distributes the control power to each set PLC participating in frequency modulation through the calculation control of the power plant AGC to control the set to start/stop and adjust. The AGC of the power plant sets the upper limit and the lower limit of the total regulation, the active power of the power plant automatically controls and sets the upper limit and the lower limit of the regulation of the generator set, and the limit exceeding alarm is carried out.
Further, as shown in fig. 4, a frequency modulation mode for automatic control of the active power of the power plant is selected, the automatic control of the active power of the power plant receives a scheduled frequency modulation instruction (control power PACE), the number of start-up units and the number of stop-up units are calculated according to the rated power Pe of the units by the automatic control of the active power of the power plant, an integer is taken when the power plant stops, the integer is taken when the power plant starts up and is added by 1, and the frequency modulation units are sequentially selected to start up and stop. And then the active power of the power plant is automatically controlled, calculated and regulated, the adjustable quantity PACE is regulated and averagely distributed to the running active power automatic control frequency modulation unit, and when the active power of the unit Pic is more than or equal to PH, the power regulation of the unit only accepts a down-regulation instruction. When the unit Pig is less than or equal to PL, the power regulation of the unit only receives an up regulation instruction. The active power is automatically controlled to give an instruction to the set PLC for adjustment, and when a dead zone exists in the speed regulator, the adjustment is finished when the PACE = 0. The AGC dead zone is a parameter which is set by an AGC adjusting system and is used for ensuring the minimum starting adjustment of system adjusting precision and system stability, and is an allowable deviation. This requires that the adjustment be done in place, and the adjustment cannot be randomly done within the standard.
Furthermore, in the running process of the hydroelectric generating set, the remote control priority level is higher than the site monitoring control priority level, and the site monitoring control priority level is higher than the site LCU control.
In one embodiment, when the AGC operation mode of the power plant is set to a total power regulation operation mode, the method for automatically controlling the active power of the hydraulic power plant comprises the following steps:
step S221: and acquiring a scheduling instruction issued by the power grid AGC or the set generating power of the power plant.
Step S222: and calculating an adjusting power deviation value according to the real-time monitoring data.
Step S223: and when the adjusting power deviation value is in the first adjusting area, setting the AGC working mode into a first-stage total power adjusting working mode.
Step S224: and when the regulating power deviation value is in a second regulating area, setting the AGC working mode into a two-stage total power regulating working mode, wherein the first regulating area is larger than the preset dead zone and smaller than the second regulating area.
In one embodiment, the primary total power regulation mode: the working mode takes the total power as an adjusting object, and the target power of the unit is the basic power plus the adjusting power. As shown in FIG. 5, the adjustment power is further divided into a dead zone (Δ P |. less than or equal to P1), a primary adjustment area (Δ P1 |. P |. less than or equal to P2= Pe), and a secondary adjustment area (Δ P |. P2). When the adjusting power (Δ P1 ≦ P2= Pe), the active power is automatically controlled to operate in the first-level adjusting area; the adjusting mode adopts a control method of limited grouping unidirectional adjustment, and sets a condition conversion unidirectional adjusting instruction. And (3) a two-stage total power regulation mode: when the adjusting power Δ P > Δ P2, the active power automatic control unit operates in the secondary adjusting area.
In one embodiment, when the AGC operation mode of the power plant is set to a primary total power regulation operation mode, the method for automatically controlling the active power of the hydraulic power plant comprises the following steps:
step S2231: and calculating the number of the on-off units according to a scheduling instruction or the set generating power of the power plant and the rated power of the units, and sequentially selecting total power AGC to adjust the on-off of the units according to the calculation result.
Step S2232: and distributing the adjusting load to each unit participating in the automatic control power adjustment of the active power according to the adjusting power deviation value.
Step S2233: and acquiring the actual power of each unit in real time.
Step S2234: and when the actual power of the unit is greater than the preset lower limit value, automatically controlling the active power, and issuing the regulation load to the running active power automatic control power regulation unit in a limited grouping unidirectional distribution mode.
Step S2235: and when the actual power of the unit is greater than the preset upper limit value, outputting a power down-regulation instruction to the unit.
Step S2236: and when the actual power of the unit is smaller than the preset lower limit value, outputting a power up-regulation instruction to the unit.
In one embodiment, step S2234 includes the following steps:
step S22341: dividing the units participating in the automatic control power regulation of the active power into two groups;
Step S22342: distributing the up-regulation instruction to a first group of active power automatic control units, and sending the down-regulation instruction to a second group of active power automatic control units;
step S22343: and when the actual power of the first group of active power automatic control units is greater than a preset upper limit value or the actual power of the second group of active power automatic control units is less than a preset lower limit value, distributing the down-regulation instruction to the first group of active power automatic control units, and sending the up-regulation instruction to the second group of active power automatic control units.
In the embodiment of the invention, a total power regulation mode for automatically controlling the active power of the power plant is selected, and the active power of the power plant is automatically controlled to receive a scheduled power regulation instruction or a power plant setting (PM +. PT, where PM is a planned power generation power and PT is a regulation power). When PT is less than or equal to P1, the machine set can be kept stable after high-frequency filtering without frequent action. As shown in FIG. 6, when Δ P1 ≦ PT ≦ P2, the active power is automatically controlled within the primary regulation range, the power plant active power is automatically controlled to be counted up by the total power PM +. PT according to the rated power Pe of the unit, the number of the units are shut down, the whole number is taken when the unit is started, the whole number is added with 1, the unit is controlled to be automatically started and shut down in sequence, and the total power regulation unit is automatically controlled by selecting the active power. Then the active power of the power plant is automatically controlled and calculated to adjust the adjustable quantity PTj, when Pig is larger than or equal to PL, the active power is automatically controlled, and limited groups are unidirectionally distributed to the active power automatic control power adjusting unit which runs. The limited grouping unidirectional regulation means that when the active power is automatically controlled to run in a first-level regulation area, the active power to be regulated is smaller (Δ P1 ≦ P2= Pe), all the units automatically controlled by the active power are not required to participate, only limited units (1-2 units in one direction) are arranged for grouping regulation, one group of units increases power in one direction and the other group decreases power in one direction. The up-regulation instruction is distributed to 1 group of active power automatic control units, and the down-regulation instruction is issued to 2 groups of units. And setting a condition conversion unidirectional adjustment instruction. When the unit Pic is more than or equal to PH, the power regulation of the unit only receives a down-regulation instruction. When the unit Pig is less than or equal to PL, the power regulation of the unit only receives the up regulation instruction. The active power is automatically controlled to give an instruction to the set PLC for adjustment, and the adjustment is finished when the Δ PT =0 in consideration of dead zones of the speed regulator.
In one embodiment, when the AGC operation mode of the power plant is set to a two-stage total power regulation operation mode, the method for automatically controlling the active power of the hydraulic power plant comprises the following steps:
step S2241: and calculating the number of the on-off units according to a scheduling instruction or the set generating power of the power plant and the rated power of the units, and sequentially selecting total power AGC to adjust the on-off of the units according to the calculation result.
Step S2242: and distributing the adjusting load to each unit participating in the automatic control power adjustment of the active power according to the adjusting power deviation value.
Step S2243: and acquiring the actual power of each unit in real time.
When the actual power of the unit is larger than the preset lower limit value, the active power automatic control is automatically put into operation, and the adjusting load is averagely distributed to the active power automatic control unit which operates.
Step S2244: and when the actual power of the unit is greater than the preset upper limit value, outputting a power down-regulation instruction to the unit.
Step S2245: and when the actual power of the unit is smaller than the preset lower limit value, outputting a power up-regulation instruction to the unit.
In a specific embodiment, as shown in fig. 7, the total power regulation mode of the active power automatic control of the power plant is selected, the active power automatic control of the power plant receives the scheduled power regulation instruction or the power plant setting (PM +. PT, regulating power. Δ PT), when |. PT >. P2, the active power is automatically controlled in the secondary regulation range, the active power automatic control of the power plant is calculated by the total power (PM +. PT) according to the rated power Pe of the unit, the number of the shutdown stations is counted, the integer is counted when the unit is shut down, the integer is counted when the unit is started up, the integer is added by 1, the units are controlled to automatically start and shut down in sequence, and the active power automatic control of the total power regulation unit is selected. Then the active power of the power plant is automatically controlled to calculate the adjustable amount of PTj, when Pic is larger than or equal to PL, the active power is automatically controlled and evenly distributed to the running active power automatic control unit, and when the unit Pic is larger than or equal to PH, the power adjustment of the unit only receives the down-regulation instruction. When the unit Pig is less than or equal to PL, the power regulation of the unit only receives the up regulation instruction. And the active power is automatically controlled to give an instruction to the unit PLC for regulation.
Further, when the patient has a P not more than 0.5P 2, the patient automatically jumps to a first-level regulation area for regulation. Because the total capacity of the primary regulation parameter regulating unit is reduced, the control precision of regulation is greatly improved, and the active power automatic regulation is easily controlled within the required precision range. When the active power automatic control operates in the secondary regulation area, the active power automatic control is not set as a unit participating in primary regulation, and when the active power is regulated into the primary regulation area, the regulation is stopped, so that the undershoot/overshoot range of the part of the unit participating in regulation is enlarged, and the improvement of the overall active power control precision is also facilitated.
An embodiment of the present invention provides an automatic active power control system for a hydraulic power plant, as shown in fig. 8, including:
and the acquisition module 1 is used for acquiring real-time monitoring data of the power plant. For details, refer to the related description of step S1 in the above method embodiment, and are not repeated herein.
And the setting module 2 is used for selecting a power plant AGC working mode according to the monitoring data, wherein the power plant AGC working mode comprises a frequency modulation working mode and a total power regulation working mode, and the total power regulation working mode comprises a primary total power regulation working mode and a secondary total power regulation working mode. For details, refer to the related description of step S2 in the above method embodiment, and are not repeated herein.
An embodiment of the present invention provides a computer device, as shown in fig. 9, the device may include a processor 81 and a memory 82, where the processor 81 and the memory 82 may be connected through a bus or in other ways, and fig. 9 takes the connection through the bus as an example.
The memory 82, which is a non-transitory computer-readable storage medium, may be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the corresponding program instructions/modules in the embodiments of the present invention. The processor 81 executes various functional applications and data processing of the processor by running non-transitory software programs, instructions and modules stored in the memory 82, so as to implement the method for automatically controlling the active power of the hydraulic power plant in the above method embodiment.
The memory 82 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor 81, and the like. Further, the memory 82 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 82 may optionally include memory located remotely from the processor 81, which may be connected to the processor 81 via a network. Examples of such networks include, but are not limited to, the internet, intranets, mobile communication networks, and combinations thereof.
One or more modules are stored in the memory 82 and, when executed by the processor 81, perform the method for automated control of active power of a hydroelectric power plant as in the embodiments shown in fig. 1-7.
The details of the computer device can be understood by referring to the corresponding descriptions and effects in the embodiments shown in fig. 1 to fig. 7, and are not described herein again.
Those skilled in the art will appreciate that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and the processes of the embodiments of the methods described above can be included when the computer program is executed. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD) or a Solid State Drive (SSD), etc.; the storage medium may also comprise a combination of memories of the kind described above.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (8)
1. An automatic control method for active power of a hydraulic power plant is characterized by comprising the following steps:
acquiring real-time monitoring data of a power plant;
selecting a power plant AGC working mode according to the monitoring data, wherein the power plant AGC working mode comprises a frequency modulation working mode and a total power regulation working mode, and the total power regulation working mode comprises a primary total power regulation working mode and a secondary total power regulation working mode;
when the AGC working mode of the power plant is set to be a total power regulation working mode, the automatic control method for the active power of the hydraulic power plant comprises the following steps:
acquiring a scheduling instruction issued by a power grid AGC or a set power generation power of a power plant;
calculating an adjusting power deviation value according to the real-time monitoring data;
when the adjusting power deviation value is in a first adjusting area, setting the AGC working mode as a primary total power adjusting working mode;
When the adjusting power deviation value is in a second adjusting area, setting the AGC working mode to a two-stage total power adjusting working mode, wherein the first adjusting area is larger than a preset dead zone and smaller than the second adjusting area;
when the AGC working mode of the power plant is set to be a primary total power regulation working mode, the automatic active power control method of the hydraulic power plant comprises the following steps:
calculating the number of the on/off units according to the scheduling instruction or the set generating power of the power plant and the rated power of the unit, and sequentially selecting total power AGC to adjust the on/off of the unit according to the calculation result;
distributing adjusting loads to all units participating in active power automatic control power adjustment according to the adjusting power deviation value;
acquiring the actual power of each unit in real time;
when the actual power of the unit is larger than a preset lower limit value, automatically putting active power automatic control into use, and issuing a regulation load to an active power automatic control power regulation unit which runs in a limited grouping unidirectional distribution mode;
when the actual power of the unit is larger than a preset upper limit value, outputting a power down-regulation instruction to the unit;
and when the actual power of the unit is smaller than a preset lower limit value, outputting a power up-regulation instruction to the unit.
2. The method according to claim 1, characterized in that when the plant AGC operation mode is set to the fm operation mode, the method comprises:
acquiring a scheduling instruction issued by a power grid AGC;
calculating the number of the on/off units according to the scheduling instruction and the rated power of the units, and sequentially selecting the frequency modulation units to be on/off according to the calculation result;
calculating a frequency control deviation value according to the real-time monitoring data;
converting the frequency control deviation value into corresponding control power;
and averagely distributing the control power to each set participating in frequency modulation, and controlling each set to carry out power regulation.
3. The method for automatic control of active power of a hydroelectric power plant of claim 2, further comprising:
acquiring the actual power of each unit participating in frequency modulation in real time;
when the actual power of the unit is larger than a preset upper limit value, outputting a power down-regulation instruction to the unit;
and when the actual power of the unit is smaller than a preset lower limit value, outputting a power up-regulation instruction to the unit.
4. The method according to claim 1, wherein the automatic active power control is automatically performed when the actual power of the unit is greater than a preset lower limit value, and the regulation load is issued to the operating automatic active power control power regulation unit in a limited grouping unidirectional distribution manner, and the method comprises:
Dividing the units participating in the automatic control power regulation of the active power into two groups;
distributing the up-regulation instruction to a first group of active power automatic control units, and sending the down-regulation instruction to a second group of active power automatic control units;
when the actual power of the first group of active power automatic control units is larger than a preset upper limit value or the actual power of the second group of active power automatic control units is smaller than a preset lower limit value, the down-regulation instruction is distributed to the first group of active power automatic control units, and the up-regulation instruction is issued to the second group of active power automatic control units.
5. The method according to claim 1, characterized in that when the plant AGC operation mode is set to the two-stage gross power regulation operation mode, the method comprises:
calculating the number of the on/off units according to the scheduling instruction or the set generating power of the power plant and the rated power of the unit, and sequentially selecting total power AGC to adjust the on/off of the unit according to the calculation result;
distributing adjusting loads to all units participating in active power automatic control power adjustment according to the adjusting power deviation value;
acquiring the actual power of each unit in real time;
When the actual power of the unit is larger than a preset lower limit value, automatically putting active power automatic control into operation, and averagely distributing the adjusting load to the active power automatic control unit in operation;
when the actual power of the unit is larger than a preset upper limit value, outputting a power down-regulation instruction to the unit;
and when the actual power of the unit is smaller than a preset lower limit value, outputting a power up-regulation instruction to the unit.
6. An automatic control system for active power of a hydraulic power plant, comprising:
the acquisition module is used for acquiring real-time monitoring data of the power plant;
the device comprises a setting module, a monitoring module and a control module, wherein the setting module is used for selecting a power plant AGC working mode according to the monitoring data, the power plant AGC working mode comprises a frequency modulation working mode and a total power regulation working mode, and the total power regulation working mode comprises a primary total power regulation working mode and a secondary total power regulation working mode;
when the AGC working mode of the power plant is set to be a total power regulation working mode, the automatic control method for the active power of the hydraulic power plant comprises the following steps:
acquiring a scheduling instruction issued by a power grid AGC or a set power generation power of a power plant;
calculating an adjusting power deviation value according to the real-time monitoring data;
when the adjusting power deviation value is in a first adjusting area, setting the AGC working mode as a primary total power adjusting working mode;
When the adjusting power deviation value is in a second adjusting area, setting the AGC working mode to a two-stage total power adjusting working mode, wherein the first adjusting area is larger than a preset dead zone and smaller than the second adjusting area;
when the AGC working mode of the power plant is set to be a primary total power regulation working mode, the automatic active power control method of the hydraulic power plant comprises the following steps:
calculating the number of the starting and stopping units according to the scheduling instruction or the set generating power of the power plant and the rated power of the units, and sequentially selecting total power AGC to regulate the starting and stopping of the units according to the calculation result;
distributing adjusting loads to all units participating in active power automatic control power adjustment according to the adjusting power deviation value;
acquiring the actual power of each unit in real time;
when the actual power of the unit is larger than a preset lower limit value, automatically putting active power automatic control into use, and issuing a regulation load to an active power automatic control power regulation unit which runs in a limited grouping unidirectional distribution mode;
when the actual power of the unit is larger than a preset upper limit value, outputting a power down-regulation instruction to the unit;
and when the actual power of the unit is smaller than a preset lower limit value, outputting a power up-regulation instruction to the unit.
7. A computer-readable storage medium, characterized in that it stores computer instructions for causing the computer to execute the method for automatic control of active power of a hydroelectric power plant according to any of claims 1 to 5.
8. A computer device, comprising: a memory and a processor, wherein the memory and the processor are communicatively connected with each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the hydraulic power plant active power automatic control method according to any one of claims 1 to 5.
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