CN111049127A - Simulation method and system for active automatic control of flexible load participating power grid - Google Patents
Simulation method and system for active automatic control of flexible load participating power grid Download PDFInfo
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Abstract
The invention discloses a simulation method and a system for active automatic control of a flexible load participating in a power grid, wherein the method comprises the following steps: aggregating the flexible loads with active control capacity of the power grid based on a flexible load simulation model which is constructed in advance to obtain a flexible load equivalent generator set; simulating the disturbance of a power grid system, adjusting the power by AGC, and distributing the power to all the units of the power grid; and the flexible load equivalent generator set respectively controls the power of each flexible load based on the distributed power. The method effectively analyzes the influence of the power grid flexible load participating in the power grid active control on the power grid operation.
Description
Technical Field
The invention relates to the field of power system analysis, in particular to a simulation method and a simulation system for active automatic control of a power grid by participation of a flexible load.
Background
With the advance of smart grid construction and electric power marketization, the flexible load ratio with active response capability in the power grid is gradually increased, and the difficulty of power grid operation control is increased. Active control of a traditional power system is generally to the power generation side, active automatic control is carried out on a thermal power generating unit, and changes of operating characteristics of a power grid after flexible loads of the power grid participate in the active control cannot be simulated. In order to effectively analyze the influence of the active control of the power grid, which is participated by the flexible load of the power grid, on the operation of the power grid, the problem that the flexible load actively participates in the simulation needs to be solved.
Disclosure of Invention
In order to solve the above-mentioned deficiencies in the prior art, the invention provides a simulation method for a flexible load to participate in active automatic control of a power grid, comprising the following steps: expanding a load model of the current power grid simulation system, and establishing a detailed flexible load simulation model; aggregating flexible loads with active control capacity in the whole network, and establishing an equivalent generator set to participate in AGC control; the power grid simulation system simulates system disturbance, automatic power adjustment is carried out by AGC, and a control instruction is sent to the power grid simulation system; and respectively carrying out power control on the flexible loads to which the flexible load equivalent generators belong, and returning the control results to the power grid simulation system. The invention breaks through the limitation that the traditional power grid simulation system can not automatically control the flexible load, expands and establishes the flexible load model with automatic response capability, uniformly participates in AGC control after characteristic aggregation, and effectively analyzes and evaluates the influence of the flexible load in the power grid on the operation control of the power grid.
The invention provides a simulation method for active automatic control of a power grid by participation of a flexible load, which specifically comprises the following steps:
aggregating the flexible loads with active control capacity of the power grid based on a flexible load simulation model which is constructed in advance to obtain a flexible load equivalent generator set;
simulating the disturbance of a power grid system, adjusting the power by AGC, and distributing the power to all the units of the power grid;
and the flexible load equivalent generator set respectively controls the power of each flexible load based on the distributed power.
Preferably, the construction of the flexible load simulation model includes:
decomposing a physical load model in the power grid system to obtain a flexible load with active control capability;
constructing a flexible load simulation model corresponding to each flexible load based on each flexible load and the flexible load attribute;
establishing a corresponding relation between a physical load model and a flexible load simulation model based on equipment keywords of the physical load model to which each flexible load belongs;
wherein the compliant load attribute comprises: capacity can be adjusted up, capacity can be adjusted down, and response speed.
Preferably, the aggregating the flexible load with active control capability of the power grid based on the flexible load simulation model constructed in advance to obtain the flexible load equivalent generator set includes:
counting the attributes of all flexible loads with power control capacity to obtain the counted total load capacity, total adjustable capacity and response speed;
adding a flexible load equivalent generator set record in an AGC generator set table, wherein the type of the generator set is set as an AGC controlled generator set, and the rated capacity corresponds to the total load capacity, the upper limit capacity and the lower limit capacity respectively correspond to the total adjustable capacity and the total adjustable capacity, and the adjusting rate corresponds to the response speed;
recording the equipment keywords of the flexible load equivalent generator set in the physical load model, and establishing the corresponding relation between the physical load model and the flexible load equivalent generator set.
Preferably, the simulating the disturbance of the power grid system, performing power adjustment by an AGC, and performing power distribution on all units of the power grid includes:
simulating the power grid system to generate disturbance, and carrying out load flow and frequency calculation to obtain a calculation result;
and performing ACE real-time calculation by the AGC based on the calculation result, the planned value and the measured value of the current tie line and the system frequency deviation value, and performing power distribution on the whole network AGC unit when the ACE deviation value exceeds a threshold value.
Preferably, after the power distribution is performed on the full-network AGC set, the method further includes:
and for the thermal power generating unit, modifying the target power of the corresponding generating unit in the power grid model.
Preferably, the flexible load equivalent generator set respectively performs power control on each flexible load based on the distributed power, and the power control includes:
counting all flexible loads related to the flexible load equivalent generator set;
distributing the total regulating quantity corresponding to the flexible load equivalent generator set to all related flexible loads;
and performing active response simulation on each flexible load, and achieving the adjustment target value in a plurality of simulation cycles.
Preferably, the distributing the total adjustment amount corresponding to the flexible load equivalent generator set to all the associated flexible loads includes:
determining the total response of the flexible load equivalent generator set according to the corresponding relation between the equivalent generator set and the flexible load;
if the total response quantity of the flexible load equivalent generator set is less than the total adjustment quantity, adjusting each flexible load to a limit value;
otherwise, sequencing is carried out according to the response characteristic of each flexible load, the total regulating quantity is distributed to each flexible load, and the regulating target value is written into the power value domain of the corresponding real-time library;
the response characteristics include response cost and response speed of the flexible load.
Preferably, the performing the active response simulation on each flexible load and reaching the adjustment target value in a plurality of simulation cycles includes:
calculating to obtain the power quantity required to be adjusted of the current simulation step length based on the adjustment target value;
superposing the current power with the regulated quantity to obtain the output power of the current simulation cycle, simultaneously judging whether the output power reaches a regulated target value, if the target value is completely regulated, marking the regulated mark of the flexible load at a position 0, otherwise, continuing to perform active response simulation in the next simulation cycle;
after all the flexible loads complete one round of simulation, checking the load regulation flag bit of each flexible load, if all the flexible loads are 0, setting the load regulation flag bit of the equivalent generator to 0, writing the active power value of the equivalent generator, and finishing the regulation; and if the load regulation zone bit of the flexible load is 1, counting the residual regulation power amount, and continuously distributing to the flexible load with the regulation zone bit of 1.
Preferably, the establishment of the flexible load equivalent generator set comprises the following steps:
and equating the flexible load of the power grid to be one generator set, or equating the flexible load of one area to be one generator set according to the area characteristics, wherein the power grid comprises a plurality of flexible load equivalent generator sets.
Based on the same invention concept, the invention also provides a simulation system for the active automatic control of the power grid by the participation of the flexible load, which comprises the following steps:
the power grid simulation platform is used for aggregating the flexible loads with active control capacity of the power grid based on a flexible load simulation model which is constructed in advance to obtain a flexible load equivalent generator set; the system is also used for simulating the disturbance of the power grid system;
the regulation and control system is used for carrying out power regulation by the AGC and carrying out power distribution on all the units of the power grid;
and the flexible load equivalent generator set is used for respectively carrying out power control on each flexible load based on the distributed power.
Preferably, the power grid simulation platform includes: the construction module is used for constructing a flexible load simulation model;
the building module comprises:
the decomposition unit is used for decomposing a physical load model in the power grid system to obtain a flexible load with active control capacity;
the construction unit is used for constructing a flexible load simulation model corresponding to each flexible load based on each flexible load and the flexible load attribute;
the association unit is used for establishing a corresponding relation between the physical load model and the flexible load simulation model based on the equipment keywords of the physical load model to which each flexible load belongs;
wherein the compliant load attribute comprises: capacity can be adjusted up, capacity can be adjusted down, and response speed.
Preferably, the power grid simulation platform further includes:
the statistical module is used for carrying out statistics on the attributes of all flexible loads with power control capacity to obtain the total load capacity, the total adjustable capacity and the response speed after the statistics;
the system comprises an adding module, a control module and a control module, wherein the adding module is used for adding a flexible load equivalent generator set record in an AGC generator set table, the type of the generator set is set as an AGC controlled generator set, the rated capacity corresponds to the total load capacity, the upper limit capacity and the lower limit capacity respectively correspond to the total adjustable capacity and the total adjustable capacity, and the adjusting rate corresponds to the response speed;
and the association module of the flexible load equivalent generator set is used for recording the equipment keywords of the flexible load equivalent generator set in the physical load model and establishing the corresponding relation between the physical load model and the flexible load equivalent generator set.
Preferably, the power grid simulation platform further includes:
the simulation disturbance module is used for simulating disturbance of a power grid system, and carrying out load flow and frequency calculation to obtain a calculation result;
the regulation and control system comprises:
and the distribution module is used for carrying out ACE real-time calculation by the AGC based on the calculation result, the plan value and the measured value of the current connecting line and the system frequency deviation value, carrying out power distribution on the whole-network AGC unit when the ACE deviation value exceeds a threshold value, and sending a control instruction to the power grid simulation platform.
Preferably, the power grid simulation platform further includes:
the thermal power generating unit control module is used for modifying the target power of the corresponding generating unit in the power grid model based on the adjusting power of the thermal power generating unit in the control instruction;
and the flexible load equivalent generator set control module is used for carrying out optimization sequencing according to the response characteristic of the flexible load and the constraint condition based on the total adjustment amount of the flexible load equivalent generator set in the control instruction, and distributing an adjustment target value for each flexible load.
Compared with the prior art, the invention has the beneficial effects that:
according to the technical scheme provided by the invention, flexible loads with active control capacity of a power grid are aggregated based on a flexible load simulation model which is constructed in advance, so that a flexible load equivalent generator set is obtained; simulating the disturbance of a power grid system, adjusting the power by AGC, and distributing the power to all the units of the power grid; and the flexible load equivalent generator set respectively controls the power of each flexible load based on the distributed power. The flexible load equivalent generator set participates in AGC power regulation, and the flexible load simulation model and the flexible load equivalent generator set are utilized to enable the flexible load to actively participate in simulation, so that the flexible load participates in active control of a power grid, and the effect of the active control of the power grid, which participates in the active control of the power grid, on the operation of the power grid is effectively analyzed.
The technical scheme provided by the invention breaks through the limitation of the traditional power grid simulation system in the aspect of load active control simulation, expands and establishes a detailed flexible load simulation model, performs detailed simulation on the active response characteristic of the flexible load, and effectively analyzes the capability of the flexible load in participating in active control in the power grid.
According to the technical scheme provided by the invention, a method for aggregating and equating the flexible load characteristics is established, the complex and various flexible load response characteristics are subjected to statistical aggregation, the equivalent is a controllable generator set, and the controllable generator set and the conventional thermal power generating unit participate in AGC control.
The aggregation range of the equivalent unit provided by the invention can be customized, the flexible load in the power grid can be equivalent to one generator set, and one generator set can be equivalent to each region according to the region attributes, so that the requirements on different simulation granularities are realized.
Drawings
FIG. 1 is a flow chart of a simulation method for active power automatic control of a flexible load according to the present invention;
FIG. 2 is a frame diagram of a simulation system for active automatic control of a flexible load according to the present invention;
FIG. 3 is a flow chart of flexible load distribution in an embodiment of the present invention;
fig. 4 is a flow chart of an active response of a flexible load according to an embodiment of the present invention.
Detailed Description
For a better understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and examples.
Example 1
The method comprises the steps of expanding a load model on the basis of the existing power grid simulation system, establishing a detailed flexible load simulation model, decomposing a flexible load into a flexible load with control capability and a conventional load, aggregating the flexible load and the conventional load according to the response characteristics of the loads, aggregating the loads with the control capability into an equivalent unit to participate in power grid interactive control simulation, and realizing simulation analysis of the control characteristics of the flexible load.
As shown in fig. 1, the method for simulating active automatic control of a flexible load participating in a power grid provided by the invention comprises the following steps:
s1, aggregating the flexible loads with active control capacity of the power grid based on a flexible load simulation model which is constructed in advance to obtain a flexible load equivalent generator set;
s2, simulating the disturbance of the power grid system, adjusting the power by AGC, and distributing the power to all the units of the power grid;
and S3, the flexible load equivalent generator set respectively controls the power of each flexible load based on the distributed power.
The simulation method for the active automatic control of the power grid by the flexible load is specifically described based on fig. 2, and comprises the following steps:
step 1: decomposing a physical load model in the current power grid simulation platform, establishing a flexible load simulation model according to typical classification, and maintaining the corresponding relation between the flexible load simulation model and the physical load model.
Step 2: aggregating the flexible load characteristics with the master control capability in the power grid simulation platform, equating the aggregated response characteristics to a generator set to participate in AGC control, and maintaining the corresponding relation between the flexible load and the equivalent generator set;
and step 3: the power grid simulation platform sets system disturbance, the regulation and control system carries out AGC simulation calculation, and control strategies of a conventional generator and a flexible load equivalent generator set are sent to the power grid simulation platform to be executed;
and 4, step 4: the flexible load simulation receives a control instruction of the equivalent generator set, respectively controls the flexible loads to which the flexible loads belong according to the response capability of the flexible loads, and returns a control result to the power grid simulation platform;
the invention discloses three key technical problems and provides corresponding technical measures.
Flexible load automatic modeling and aggregation equivalent technology
In a traditional power grid simulation system, a detailed low-voltage level load model is not usually provided, and a main transformer is directly treated as an equivalent load. Taking a provincial power grid simulation system as an example, the high-voltage side equivalent of a 220kV main transformer is generally taken as a load in the power grid simulation system. According to typical flexible load types combed, the method carries out decomposition and refinement on main transformer equivalence, and the main transformer equivalence is decomposed into three flexible loads with different response attributes, the three flexible loads have characteristics shown in table 1, and the proportion and the response characteristics of the three flexible loads can be modified according to actual conditions.
TABLE 1 Flexible load types and characteristics
The invention establishes three typical flexible load types which respectively correspond to three different simulation modes of a plan tracking type, an active response type and a third-party simulation type, and can adjust the proportion of the three types to analyze the response capability of the flexible loads with different scales and different response capabilities to the power grid disturbance.
The flexible load related to the invention is mainly an active response type load, typical parameter attributes of the type of load are shown in table 2, and the parameter attributes of each flexible load can be adjusted according to actual conditions.
TABLE 2 typical parameters of active response type load
Aggregating the typical attributes of all the active response type flexible loads, and corresponding to the typical control characteristics of the AGC controlled unit, wherein the main attributes and the corresponding relation are shown in a table 3:
TABLE 3 typical control characteristic corresponding table for AGC controlled machine set
Adding a flexible load equivalent unit model information in an AGC module of a regulation and control system, and obtaining corresponding key attributes after statistics according to an aggregation principle, wherein a plant station to which an equivalent unit belongs can be set as a virtual plant station. And adding a corresponding PLC model in a PLC table of the AGC, and associating with the equivalent unit.
Meanwhile, a corresponding active control model is added in a power grid simulation platform, and the model is mainly used for receiving an equivalent generator set control instruction sent by AGC and sending the equivalent generator set control instruction to flexible load simulation for active response.
Second, power grid interactive simulation technology considering flexible load active response
The power grid interactive simulation system mainly comprises a power grid simulation platform and a regulation and control system. And the power grid simulation platform performs steady-state load flow and frequency calculation on the power grid according to the established power grid model and the operation mode, and sends the simulation result to the regulation and control system. And the regulation and control system performs AGC simulation calculation according to the received simulation data to obtain a control strategy of each generator set, and sends a control instruction to the power grid simulation platform to perform power control on the generator. The simulation result in the invention is the power grid operation data after disturbance.
The traditional power grid simulation system only performs active control on the thermal power generating unit, and after the active control of the flexible load is considered, the flexible load equivalent unit and the conventional thermal power generating unit participate in AGC closed-loop control together.
In the simulation process, the flexible load carries out power tracking according to a set load plan curve, and meanwhile, the key attributes of all the flexible loads are subjected to aggregation statistics, and the attributes of the active power, the adjustable capacity and the like of the flexible load equivalent unit are updated.
After the power grid system is simulated to be disturbed, the power grid simulation platform carries out load flow and frequency calculation, and the calculation result is sent to the regulation and control system. And an AGC module of the regulation and control system performs ACE real-time calculation according to the planned value, the measured value and the system frequency deviation value of the current tie line, and performs power distribution and closed-loop control on the whole-network AGC unit when the ACE deviation value exceeds a threshold value. For a conventional generator set, an AGC adjusting instruction is directly fed back to a power grid simulation platform in a closed loop mode to directly perform generator adjusting operation, for a flexible load equivalent generator set, optimization sequencing is performed according to response characteristics and constraint conditions of the flexible load, and a response target value of each flexible load is distributed. And each flexible load actively responds according to the respective response rate and returns the response result to the power grid simulation platform.
Active power control technology for active response power grid of flexible load
After the power grid simulation platform receives a control instruction sent by an AGC (automatic gain control) system, for a conventional thermal power generating unit, the corresponding generator set target power in a power grid model is directly modified, and for a flexible load equivalent unit, a flexible load active control technology is adopted for operation.
Firstly, all flexible load information corresponding to a flexible load equivalent unit is counted, wherein the flexible load information comprises individual and overall adjustable capacity, upper and lower load power limits and the like, and the total response power is distributed to each specific flexible sub-load by adopting an active response power distribution technology. The flexible load simulation adopts a flexible load active response simulation technology to perform active response simulation on each sub-load individual, tracks the control target power and achieves the control power target value in a plurality of simulation cycles. And meanwhile, the response result is returned to the power grid simulation platform for processing.
(1) Proactive response power allocation techniques
When an adjusting instruction is received, firstly, the total adjustable quantity of the flexible load equivalent unit is determined according to the corresponding relation between the equivalent unit and the flexible load.
If the total adjustable quantity is insufficient, each flexible load is directly adjusted to a limit value;
if the total adjustable quantity is sufficient, sequencing is carried out according to the response characteristic of each flexible load, and the considered response characteristic mainly comprises the response cost, the response speed and the like of the flexible load. And distributing the total regulating quantity to each flexible load according to a rule of priority of response speed or priority of cost, and writing the target value into a power target value field of a corresponding real-time library.
As shown in fig. 3, the flexible load distribution process includes:
receiving a power adjustment instruction;
taking all the loads of which the simulation types are active response types from the flexible load model;
counting the total adjustable quantity of the flexible load of the current system, and needing to be adjusted up to execute:
when the up-regulation capacity is sufficient, calculating the regulation proportion of each flexible load, calculating the regulation quantity of the flexible load according to the regulation proportion, writing the power regulation quantity of the flexible load, and finishing power distribution;
otherwise, all the flexible loads are set as the upper limit value, the power regulating quantity of the flexible loads is written in, and the power distribution is finished;
the down-regulation implementation is required:
when the down-regulation capacity is sufficient, calculating the regulation proportion of each flexible load, calculating the regulation quantity of the flexible load according to the regulation proportion, writing the power regulation quantity of the flexible load, and finishing power distribution;
otherwise, all the flexible loads are set as the lower limit value, the power adjustment quantity of the flexible loads is written, and the power distribution is finished.
(2) Flexible load active response simulation technology
The active response type flexible load comprises a load adjustment flag bit, and whether the flexible load is in a planned tracking state or an active response state is judged according to the load adjustment flag bit in each simulation period. If the load adjusts the position 1 of the mark, according to the current output power and the distributed target power, considering the well-defined response capability of the load, calculating to obtain the step length which should be adjusted in the current simulation period, and obtaining the output power. And simultaneously, considering the adjustment of the upper limit and the lower limit, if the obtained output power exceeds the upper limit and the lower limit of the power of the sub-load, fixing the output power on the upper limit and the lower limit, setting the load adjustment flag position to be 0, and not performing active response simulation for the next time.
As shown in fig. 4, the power amount to be adjusted of the current simulation step length is calculated according to the above principle, the current power is superimposed with the adjustment amount to obtain the output power of the current simulation cycle, and at the same time, it is determined whether the output power has reached the adjustment target value, and if the output power has completely reached the adjustment target value, the adjustment flag of the sub-load is set to 0. And if the regulation target value is not reached, continuing the active response simulation in the next simulation period.
After all the flexible loads complete one round of simulation, whether the adjusting flag bits of all the flexible loads in the system are all 0 is judged, if all the flexible loads are all 0, the system indicates that the whole system has completed active response, the system is adjusted to the flag bit position 0, and the unbalanced power response of the next round can be carried out.
Specifically, the step 1 includes:
1-1, searching all physical load models in a power grid simulation system, automatically generating three flexible load records aiming at each physical load model, wherein the three flexible load records respectively correspond to a plan tracking type, an active response type and a third-party simulation type, and the proportions of the three flexible loads are automatically set according to a predetermined typical proportion;
and 1-2, setting key attributes including adjustable capacity, adjustable capacity and response speed for each automatically generated flexible load record, and recording equipment keywords of a physical model to which the flexible load record belongs to establish the dependency relationship between the physical load and the flexible load.
Furthermore, the flexible load model record is automatically generated according to a physical load model in the current power grid simulation system, and typical characteristics of the flexible load model can be modified according to actual conditions, including the proportion of the flexible load type in the physical load, the adjustable capacity and the response speed;
the specific step 2 comprises:
2-1, counting the active response flexible loads of the whole network, extracting the static characteristics of the loads, and carrying out statistics to obtain the counted total load capacity, total adjustable capacity, response speed and the like;
2-2, adding a flexible load equivalent unit record in an AGC unit table of the regulation and control system, setting the unit type as an AGC controlled unit, wherein the rated capacity corresponds to the total load capacity, the upper and lower limit capacities correspond to the total up-down adjustable capacity, and the adjustment rate corresponds to the response speed;
and 2-3, recording equipment keywords of the flexible load equivalent unit in a physical model in the simulation system, and establishing a corresponding relation between the physical model and the aggregated equivalent unit so as to distribute the active control target power of the equivalent unit to the belonging physical load.
The number of the equivalent sets is variable, the flexible load of the whole network can be equivalent to one generator, the flexible load of one region can be equivalent to one set according to the regional characteristics, and the whole network comprises a plurality of flexible load equivalent sets;
specifically, the step 3 includes:
3-1, the flexible load equivalent unit and a conventional thermal power unit participate in AGC active control together, and the AGC distributes target power of each unit according to power deviation and sends the target power to a power grid simulation platform;
and 3-2, respectively processing the two sets by the power grid simulation platform. For a conventional unit, directly finding a corresponding generator in a database according to the equipment keyword, and modifying the active power of the generator; and for the equivalent generator with the flexible load, searching all related flexible loads according to the equivalent generator equipment keywords, setting the load regulation flag position of the equivalent generator to be 1, and performing target power distribution and response.
The specific step 4 comprises:
setting the load regulation flag position of each flexible load to be 1, and indicating that the current flexible load is carrying out active power response; sequencing according to the response speed, and considering the upper and lower regulation limits of each load, and distributing the power regulation amount to each flexible load;
4-2, each flexible load independently carries out active power response, if the flexible load can completely respond to the adjustment quantity, the load adjustment mark position of the flexible load is 0, and the end of the response is indicated;
4-3, after all the flexible load simulations are completed, checking each flexible load regulation flag bit, if all the flexible load regulation flag bits are 0, indicating that the power regulation is completed, setting the load regulation flag bit of the equivalent generator to be 0, writing the active power value of the equivalent generator into the flag bit, and finishing the regulation; and if the load regulation flag bit of the flexible load is 1, the power is not regulated in place, the rest regulation power is counted, and the flexible load with the regulation flag of 1 is continuously distributed.
The flexible load response in the invention needs to be adjusted for multiple rounds, and gradually approaches to the target power value; each flexible load has an independent adjustment flag to indicate whether a power response is complete.
Example 2
Based on the same invention concept, the invention also provides a flexible load participating power grid active automatic control simulation system, which comprises:
the power grid simulation platform is used for aggregating the flexible loads with active control capacity of the power grid based on a flexible load simulation model which is constructed in advance to obtain a flexible load equivalent generator set; the system is also used for simulating the disturbance of the power grid system;
the regulation and control system is used for carrying out power regulation by the AGC and carrying out power distribution on all the units of the power grid;
and the flexible load equivalent generator set is used for respectively carrying out power control on each flexible load based on the distributed power.
In an embodiment, the power grid simulation platform includes: the construction module is used for constructing a flexible load simulation model;
the building module comprises:
the decomposition unit is used for decomposing a physical load model in the power grid system to obtain a flexible load with active control capacity;
the construction unit is used for constructing a flexible load simulation model corresponding to each flexible load based on each flexible load and the flexible load attribute;
the association unit is used for establishing a corresponding relation between the physical load model and the flexible load simulation model based on the equipment keywords of the physical load model to which each flexible load belongs;
wherein the compliant load attribute comprises: capacity can be adjusted up, capacity can be adjusted down and response speed can be adjusted down; and the corresponding relation between the physical load model and the flexible load simulation model is embodied by the device keywords.
In an embodiment, the power grid simulation platform further includes:
the statistical module is used for carrying out statistics on the attributes of all flexible loads with power control capacity to obtain the total load capacity, the total adjustable capacity and the response speed after the statistics;
the system comprises an adding module, a control module and a control module, wherein the adding module is used for adding a flexible load equivalent generator set record in an AGC generator set table, the type of the generator set is set as an AGC controlled generator set, the rated capacity corresponds to the total load capacity, the upper limit capacity and the lower limit capacity respectively correspond to the total adjustable capacity and the total adjustable capacity, and the adjusting rate corresponds to the response speed;
and the association module of the flexible load equivalent generator set is used for recording the equipment keywords of the flexible load equivalent generator set in the physical load model and establishing the corresponding relation between the physical load model and the flexible load equivalent generator set.
In an embodiment, the power grid simulation platform further includes:
the simulation disturbance module is used for simulating disturbance of a power grid system, and carrying out load flow and frequency calculation to obtain a calculation result;
the regulation and control system comprises:
and the distribution module is used for carrying out ACE real-time calculation by the AGC based on the calculation result, the plan value and the measured value of the current connecting line and the system frequency deviation value, carrying out power distribution on the whole-network AGC unit when the ACE deviation value exceeds a threshold value, and sending a control instruction to the power grid simulation platform.
In an embodiment, the power grid simulation platform further includes:
the thermal power generating unit control module is used for modifying the target power of the corresponding generating unit in the power grid model based on the adjusting power of the thermal power generating unit in the control instruction;
and the flexible load equivalent generator set control module is used for carrying out optimization sequencing according to the response characteristic of the flexible load and the constraint condition based on the total adjustment amount of the flexible load equivalent generator set in the control instruction, and distributing an adjustment target value for each flexible load.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (14)
1. A simulation method for active automatic control of a flexible load participating in a power grid is characterized by comprising the following steps:
aggregating the flexible loads with active control capacity of the power grid based on a flexible load simulation model which is constructed in advance to obtain a flexible load equivalent generator set;
simulating the disturbance of a power grid system, adjusting the power by AGC, and distributing the power to all the units of the power grid;
and the flexible load equivalent generator set respectively controls the power of each flexible load based on the distributed power.
2. The method of claim 1, wherein the constructing of the flexible load simulation model comprises:
decomposing a physical load model in the power grid system to obtain a flexible load with active control capability;
constructing a flexible load simulation model corresponding to each flexible load based on each flexible load and the flexible load attribute;
establishing a corresponding relation between a physical load model and a flexible load simulation model based on equipment keywords of the physical load model to which each flexible load belongs;
wherein the compliant load attribute comprises: capacity can be adjusted up, capacity can be adjusted down, and response speed.
3. The method of claim 2, wherein the aggregating the flexible loads with active control capability of the power grid based on the pre-constructed flexible load simulation model to obtain a flexible load equivalent generator set comprises:
counting the attributes of all flexible loads with power control capacity to obtain the counted total load capacity, total adjustable capacity and response speed;
adding a flexible load equivalent generator set record in an AGC generator set table, wherein the type of the generator set is set as an AGC controlled generator set, and the rated capacity corresponds to the total load capacity, the upper limit capacity and the lower limit capacity respectively correspond to the total adjustable capacity and the total adjustable capacity, and the adjusting rate corresponds to the response speed;
recording the equipment keywords of the flexible load equivalent generator set in the physical load model, and establishing the corresponding relation between the physical load model and the flexible load equivalent generator set.
4. The method of claim 1, wherein simulating a grid system disturbance, performing power regulation by the AGC, and performing power distribution to all units of the grid comprises:
simulating the power grid system to generate disturbance, and carrying out load flow and frequency calculation to obtain a calculation result;
and performing ACE real-time calculation by the AGC based on the calculation result, the planned value and the measured value of the current tie line and the system frequency deviation value, and performing power distribution on the whole network AGC unit when the ACE deviation value exceeds a threshold value.
5. The method of claim 4, wherein after the power allocation to the full-network AGC group, further comprising:
and for the thermal power generating unit, modifying the target power of the corresponding generating unit in the power grid model.
6. The method of claim 1, wherein the flexible load equivalent generator set separately power controls each flexible load based on the distributed power, comprising:
counting all flexible loads related to the flexible load equivalent generator set;
distributing the total regulating quantity corresponding to the flexible load equivalent generator set to all related flexible loads;
and performing active response simulation on each flexible load, and achieving the adjustment target value in a plurality of simulation cycles.
7. The method of claim 6, wherein distributing the total adjustment for the compliant load equivalent genset to all associated compliant loads comprises:
determining the total response of the flexible load equivalent generator set according to the corresponding relation between the equivalent generator set and the flexible load;
if the total response quantity of the flexible load equivalent generator set is less than the total adjustment quantity, adjusting each flexible load to a limit value;
otherwise, sequencing is carried out according to the response characteristic of each flexible load, the total regulating quantity is distributed to each flexible load, and the regulating target value is written into the power value domain of the corresponding real-time library;
the response characteristics include response cost and response speed of the flexible load.
8. The method of claim 6, wherein the performing an active response simulation for each compliant load to achieve the adjusted target value over a plurality of simulation cycles comprises:
calculating to obtain the power quantity required to be adjusted of the current simulation step length based on the adjustment target value;
superposing the current power with the regulated quantity to obtain the output power of the current simulation cycle, simultaneously judging whether the output power reaches a regulated target value, if the target value is completely regulated, marking the regulated mark of the flexible load at a position 0, otherwise, continuing to perform active response simulation in the next simulation cycle;
after all the flexible loads complete one round of simulation, checking the load regulation flag bit of each flexible load, if all the flexible loads are 0, setting the load regulation flag bit of the equivalent generator to 0, writing the active power value of the equivalent generator, and finishing the regulation; and if the load regulation zone bit of the flexible load is 1, counting the residual regulation power amount, and continuously distributing to the flexible load with the regulation zone bit of 1.
9. The method of claim 1, wherein the establishing of the compliant-load equivalent generator set comprises:
and equating the flexible load of the power grid to be one generator set, or equating the flexible load of one area to be one generator set according to the area characteristics, wherein the power grid comprises a plurality of flexible load equivalent generator sets.
10. A simulation system for flexible load to participate in active automatic control of a power grid is characterized by comprising:
the power grid simulation platform is used for aggregating the flexible loads with active control capacity of the power grid based on a flexible load simulation model which is constructed in advance to obtain a flexible load equivalent generator set; the system is also used for simulating the disturbance of the power grid system;
the regulation and control system is used for carrying out power regulation by the AGC and carrying out power distribution on all the units of the power grid;
and the flexible load equivalent generator set is used for respectively carrying out power control on each flexible load based on the distributed power.
11. The system of claim 10, wherein the grid simulation platform comprises: the construction module is used for constructing a flexible load simulation model;
the building module comprises:
the decomposition unit is used for decomposing a physical load model in the power grid system to obtain a flexible load with active control capacity;
the construction unit is used for constructing a flexible load simulation model corresponding to each flexible load based on each flexible load and the flexible load attribute;
the association unit is used for establishing a corresponding relation between the physical load model and the flexible load simulation model based on the equipment keywords of the physical load model to which each flexible load belongs;
wherein the compliant load attribute comprises: capacity can be adjusted up, capacity can be adjusted down, and response speed.
12. The system of claim 10, wherein the grid simulation platform further comprises:
the statistical module is used for carrying out statistics on the attributes of all flexible loads with power control capacity to obtain the total load capacity, the total adjustable capacity and the response speed after the statistics;
the system comprises an adding module, a control module and a control module, wherein the adding module is used for adding a flexible load equivalent generator set record in an AGC generator set table, the type of the generator set is set as an AGC controlled generator set, the rated capacity corresponds to the total load capacity, the upper limit capacity and the lower limit capacity respectively correspond to the total adjustable capacity and the total adjustable capacity, and the adjusting rate corresponds to the response speed;
and the association module of the flexible load equivalent generator set is used for recording the equipment keywords of the flexible load equivalent generator set in the physical load model and establishing the corresponding relation between the physical load model and the flexible load equivalent generator set.
13. The system of claim 10, wherein the grid simulation platform further comprises:
the simulation disturbance module is used for simulating disturbance of a power grid system, and carrying out load flow and frequency calculation to obtain a calculation result;
the regulation and control system comprises:
and the distribution module is used for carrying out ACE real-time calculation by the AGC based on the calculation result, the plan value and the measured value of the current connecting line and the system frequency deviation value, carrying out power distribution on the whole-network AGC unit when the ACE deviation value exceeds a threshold value, and sending a control instruction to the power grid simulation platform.
14. The system of claim 13, wherein the grid simulation platform further comprises:
the thermal power generating unit control module is used for modifying the target power of the corresponding generating unit in the power grid model based on the adjusting power of the thermal power generating unit in the control instruction;
and the flexible load equivalent generator set control module is used for carrying out optimization sequencing according to the response characteristic of the flexible load and the constraint condition based on the total adjustment amount of the flexible load equivalent generator set in the control instruction, and distributing an adjustment target value for each flexible load.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112128945A (en) * | 2020-09-10 | 2020-12-25 | 杭州派尼澳电子科技有限公司 | Method for providing active power compensation based on battery equivalent model |
| CN112350321A (en) * | 2020-11-27 | 2021-02-09 | 广东电网有限责任公司电力调度控制中心 | Flexible load regulation and control simulation system and method based on dispatching automation master station system |
| CN112989581A (en) * | 2021-02-25 | 2021-06-18 | 国网重庆市电力公司电力科学研究院 | Frequency dynamic simulation method and device, electronic equipment and storage medium |
| CN113364011A (en) * | 2021-06-30 | 2021-09-07 | 广东电网有限责任公司 | New energy secondary frequency modulation method, device and equipment |
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2019
- 2019-12-10 CN CN201911254818.5A patent/CN111049127A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112128945A (en) * | 2020-09-10 | 2020-12-25 | 杭州派尼澳电子科技有限公司 | Method for providing active power compensation based on battery equivalent model |
| CN112350321A (en) * | 2020-11-27 | 2021-02-09 | 广东电网有限责任公司电力调度控制中心 | Flexible load regulation and control simulation system and method based on dispatching automation master station system |
| CN112989581A (en) * | 2021-02-25 | 2021-06-18 | 国网重庆市电力公司电力科学研究院 | Frequency dynamic simulation method and device, electronic equipment and storage medium |
| CN113364011A (en) * | 2021-06-30 | 2021-09-07 | 广东电网有限责任公司 | New energy secondary frequency modulation method, device and equipment |
| CN113364011B (en) * | 2021-06-30 | 2022-07-12 | 广东电网有限责任公司 | New energy secondary frequency modulation method, device and equipment |
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