CN109904856A - AC-DC hybrid power grid security constraint Unit Combination calculation method and system - Google Patents
AC-DC hybrid power grid security constraint Unit Combination calculation method and system Download PDFInfo
- Publication number
- CN109904856A CN109904856A CN201910207882.1A CN201910207882A CN109904856A CN 109904856 A CN109904856 A CN 109904856A CN 201910207882 A CN201910207882 A CN 201910207882A CN 109904856 A CN109904856 A CN 109904856A
- Authority
- CN
- China
- Prior art keywords
- power
- transmission line
- direct current
- time period
- equivalent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004364 calculation method Methods 0.000 title claims abstract description 31
- 230000005540 biological transmission Effects 0.000 claims abstract description 124
- 238000005457 optimization Methods 0.000 claims abstract description 71
- 238000012544 monitoring process Methods 0.000 claims abstract description 42
- 238000005192 partition Methods 0.000 claims abstract description 8
- 238000010276 construction Methods 0.000 claims description 15
- 230000008859 change Effects 0.000 claims description 12
- 230000035945 sensitivity Effects 0.000 claims description 11
- 230000009194 climbing Effects 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000009987 spinning Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims 2
- 238000000034 method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 230000006870 function Effects 0.000 description 8
- 238000004590 computer program Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of AC-DC hybrid power grid security constraint Unit Combination calculation methods, participate in the DC power transmission line of Optimized Operation and the active power Equivalent Model of transmission line of alternation current including establishing in multizone AC-DC hybrid power grid；Based on active power Equivalent Model, the security constraint Unit Combination Optimized model for considering partition load balance is established；Solve security constraint Unit Combination Optimized model；According to optimum results, consider that overall network monitoring element carries out Security Checking；If not newly-increased monitoring element trend is out-of-limit, optimum results are exported.Also disclose corresponding system.The present invention realizes the combined optimization of multizone Unit Combination scheme and cross-zone ac and dc transmission line power plan, improves bulk power grid controling power and electric power resource distributes ability rationally from the wider Optimum Regulation realized to generation assets.
Description
Technical Field
The invention relates to a combined calculation method and a combined calculation system for a safety constraint unit of an alternating current-direct current hybrid power grid, in particular to a combined calculation method and a combined calculation system for a safety constraint unit of a multi-region alternating current-direct current hybrid power grid, and belongs to the technical field of power system dispatching automation.
Background
Due to the centralized large-scale development of renewable energy sources and the reverse distribution characteristic of an energy base and a load center, the trans-provincial and trans-regional extra-high voltage alternating current and direct current power transmission is rapidly developed, and an alternating current and direct current hybrid large power grid which is characterized by large-scale trans-regional power transmission is formed preliminarily. Along with the rapid expansion of the scale of a multi-region alternating current-direct current hybrid power grid, the integration characteristics of the power grid are prominent, and the technical requirement of the multi-region power generation and transmission plan joint optimization is increasingly urgent.
The multi-region alternating current-direct current hybrid power grid provides a high-efficiency physical platform for realizing large-range optimal configuration of energy resources and cross-region consumption of clean energy, and simultaneously brings great challenges to the formulation of a power grid dispatching plan. How to fully utilize cross-regional AC/DC transmission electric channels, excavate complementary benefits of a power supply structure between a transmission end power grid and a receiving end power grid and exert peak staggering benefits of inter-regional load characteristics is a new problem to be solved urgently in current scheduling plan compilation.
The traditional safety constraint unit combination calculation mainly faces a single control area, cross-region alternating current and direct current transmission lines are modeled into connecting lines as calculation boundaries, and the optimal configuration of global resources is difficult to achieve.
Disclosure of Invention
The invention provides a combined calculation method and a combined calculation system for a safety constraint unit of an alternating-current and direct-current hybrid power grid, which solve the problems of the combined calculation of the traditional safety constraint unit.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the combined calculation method of the safety constraint unit of the alternating current-direct current hybrid power grid comprises the following steps,
establishing an active power equivalent model of a direct current transmission line and an alternating current transmission line participating in optimized dispatching in a multi-region alternating current-direct current hybrid power grid;
establishing a safety constraint unit combination optimization model considering partition load balance based on an active power equivalent model;
solving a safety constraint unit combination optimization model;
according to the optimization result, considering all network monitoring elements to perform security check; and if the power flow of the monitoring element is not increased beyond the limit, outputting an optimization result.
The equivalent model of the active power of the direct-current transmission line is as follows,
modeling a sending end of each direct current transmission line as an equivalent load, modeling a receiving end as an equivalent generator, and taking the equivalent load and the active power of the equivalent generator as calculated optimization variables;
constraint conditions are as follows:
αdPd,t,n+Pd,t,p＝0
Pd,min≤Pd,t,n≤Pd,max
-Pd,r≤Pd,t,n-Pd,t-1,n≤Pd,r
wherein, αdIs the power loss coefficient, P, of the DC transmission line dd,t,nIs the equivalent load power P of the direct current transmission line d in the time period td,t-1,nIs the equivalent load power P of the direct current transmission line d in the time period t-1d,t,pFor the equivalent generator power, P, of the direct current transmission line d in the time period td,min,Pd,maxRespectively the lower and upper power limits, P, of the DC transmission line dd,rThe maximum value of the climbing speed of the direct current transmission line d.
The equivalent model of the active power of the alternating-current transmission line is as follows,
all external alternating current transmission line sets of the region are defined as region alternating current gateways, and active power of the alternating current gateways is used as an optimization variable of calculation;
constraint conditions are as follows:
Pa,min≤Pa,t≤Pa,max
wherein NA is the number of regions participating in optimization, Pa,tFor the ac gateway active value of area a during time period t, Pa,min,Pa,maxThe lower and upper ac gateway power limits for zone a.
The safety constraint unit combination optimization model is as follows,
an objective function:
constraint conditions are as follows:
Pi,minui,t≤Pi,t≤Pi,maxui,t
-Δi≤Pi,t-Pi,t-1≤Δi
wherein NT is the number of time segments contained in the system scheduling period, NI is the total number of the generator sets, CiFor the operating cost of the generator set i, Pi,tFor the active power output of the generator set i in the time period t, SiFor the starting cost of the generator set i, yi,tFor the generator set i whether there is a change from shutdown to startup state in time period t, AaSet of devices for area a, Pd,t,nIs the equivalent load power P of the direct current transmission line d in the time period td,t,pFor the equivalent generator power of the direct current transmission line d in the time period t, ND is the total number of the direct current transmission line, Pa,tAc gateway active value, L, for region a at time period ta,tLoad demand for region a at time t, Pi,max，Pi,minRespectively an upper limit and a lower limit, R, of the output power of the generator set ia,tFor the spinning reserve demand of region a at time t, ui,tIs the starting and stopping state of the generator set i in a time period t, zi,τFor generator set i in time interval tau-DTi+1 whether there is a flag for a change from start-up to shut-down state, UTi，DTiMinimum on-time and minimum off-time, Δ, respectively, for the generator set iiThe maximum value of the ramp rate of the generator set i per time period,respectively the lower limit and the upper limit of the current of the ith transmission section, N is a power grid computing node set, Pn,tCalculating the generated power l of the node n for the grid at the time tn,tCalculating the load power of the node n for the grid at time t, Sn,l,tAnd calculating the sensitivity of the injection power of the node n to the ith power transmission section for the time t.
And if the tidal current of the newly-added monitoring element exceeds the limit, adding the constraint conditions of the newly-added tidal current exceeding monitoring element into the constraint unit combination optimization model, and solving the safety constraint unit combination optimization model again.
The constraint condition of the newly added power flow out-of-limit monitoring element is,
wherein,respectively the lower limit and the upper limit of the current of the kth monitoring element, N is a power grid computing node set, Pn,tCalculating the generated power l of the node n for the grid at the time tn,tCalculating the load power of the node n for the grid at time t, Sn,k,tThe sensitivity of the injected power of node n to the kth monitoring element is calculated for the grid at time period t.
An alternating current-direct current hybrid power grid safety constraint unit combination computing system comprises,
an equivalent model construction module: establishing an active power equivalent model of a direct current transmission line and an alternating current transmission line participating in optimized dispatching in a multi-region alternating current-direct current hybrid power grid;
an optimization model construction module: establishing a safety constraint unit combination optimization model considering partition load balance based on an active power equivalent model;
a solving module: solving a combined optimization model of the safety constraint unit of the alternating-current and direct-current series-parallel power grid;
a checking module: according to the optimization result, considering all network monitoring elements to perform security check; and if the power flow of the monitoring element is not increased beyond the limit, outputting an optimization result.
The direct current transmission line active power equivalent model constructed by the equivalent model construction module is,
modeling a sending end of each direct current transmission line as an equivalent load, modeling a receiving end as an equivalent generator, and taking the equivalent load and the active power of the equivalent generator as calculated optimization variables;
constraint conditions are as follows:
αdPd,t,n+Pd,t,p＝0
Pd,min≤Pd,t,n≤Pd,max
-Pd,r≤Pd,t,n-Pd,t-1,n≤Pd,r
wherein, αdIs the power loss coefficient, P, of the DC transmission line dd,t,nIs the equivalent load power P of the direct current transmission line d in the time period td,t-1,nIs the equivalent load power P of the direct current transmission line d in the time period t-1d,t,pFor the equivalent generator power, P, of the direct current transmission line d in the time period td,min,Pd,maxRespectively the lower and upper power limits, P, of the DC transmission line dd,rThe maximum value of the climbing speed of the direct current transmission line d.
The active power equivalent model of the alternating current transmission line constructed by the equivalent model construction module is,
all external alternating current transmission line sets of the region are defined as region alternating current gateways, and active power of the alternating current gateways is used as an optimization variable of calculation;
constraint conditions are as follows:
Pa,min≤Pa,t≤Pa,max
wherein NA is the number of regions participating in optimization, Pa,tFor the ac gateway active value of area a during time period t, Pa,min,Pa,maxThe lower and upper ac gateway power limits for zone a.
The safety constraint unit combination optimization model constructed by the optimization model construction module comprises the following steps of,
an objective function:
constraint conditions are as follows:
Pi,minui,t≤Pi,t≤Pi,maxui,t
-Δi≤Pi,t-Pi,t-1≤Δi
wherein NT is the number of time segments contained in the system scheduling period, NI is the total number of the generator sets, CiFor the operating cost of the generator set i, Pi,tFor the active power output of the generator set i in the time period t, SiFor the starting cost of the generator set i, yi,tFor the generator set i whether there is a change from shutdown to startup state in time period t, AaSet of devices for area a, Pd,t,nIs the equivalent load power P of the direct current transmission line d in the time period td,t,pFor the equivalent generator power of the direct current transmission line d in the time period t, ND is the total number of the direct current transmission line, Pa,tAc gateway active value, L, for region a at time period ta,tLoad demand for region a at time t, Pi,max，Pi,minRespectively an upper limit and a lower limit, R, of the output power of the generator set ia,tFor the spinning reserve demand of region a at time t, ui,tIs the starting and stopping state of the generator set i in a time period t, zi,τFor generator set i in time interval tau-DTi+1 whether there is a flag for a change from start-up to shut-down state, UTi，DTiMinimum on-time and minimum off-time, Δ, respectively, for the generator set iiThe maximum value of the ramp rate of the generator set i per time period,respectively the lower limit and the upper limit of the current of the ith transmission section, N is a power grid computing node set, Pn,tCalculating the generated power l of the node n for the grid at the time tn,tCalculating the load power of the node n for the grid at time t, Sn,l,tFor the power grid at the time t, calculating the injection power of the node n for the ith power transmission interruptionThe sensitivity of the facet.
The device further comprises an iteration module: and if the tidal current of the newly-added monitoring element exceeds the limit, adding the constraint conditions of the newly-added tidal current exceeding monitoring element into the constraint unit combination optimization model, and turning to the solving module.
The constraint condition of the newly added power flow out-of-limit monitoring element is,
wherein,respectively the lower limit and the upper limit of the current of the kth monitoring element, N is a power grid computing node set, Pn,tCalculating the generated power l of the node n for the grid at the time tn,tCalculating the load power of the node n for the grid at time t, Sn,k,tThe sensitivity of the injected power of node n to the kth monitoring element is calculated for the grid at time period t.
The invention achieves the following beneficial effects: the invention can realize the optimal regulation and control of power generation resources in a larger range, can realize the combined optimization of a multi-zone unit combination scheme and a cross-zone alternating current and direct current transmission line power plan, and greatly improves the large power grid control capability and the power resource optimal configuration capability.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, the method for calculating the combination of the safety constraint units of the alternating current-direct current hybrid power grid includes the following steps:
step 1, determining a cross-regional direct-current transmission line range participating in optimized dispatching in a multi-region alternating-current and direct-current hybrid power grid, and establishing an active power equivalent model of the direct-current transmission line; determining the range of the cross-region alternating current transmission line participating in optimized dispatching in the multi-region alternating current-direct current hybrid power grid, and establishing an active power equivalent model of the alternating current transmission line.
The active power equivalent model of the direct-current transmission line is as follows:
modeling a sending end of each direct current transmission line as an equivalent load, modeling a receiving end as an equivalent generator, and taking the equivalent load and the active power of the equivalent generator as calculated optimization variables;
constraint conditions are as follows:
αdPd,t,n+Pd,t,p＝0
Pd,min≤Pd,t,n≤Pd,max
-Pd,r≤Pd,t,n-Pd,t-1,n≤Pd,r
wherein, αdIs the power loss coefficient, P, of the DC transmission line dd,t,nIs the equivalent load power P of the direct current transmission line d in the time period td,t-1,nIs the equivalent load power P of the direct current transmission line d in the time period t-1d,t,pFor the equivalent generator power, P, of the direct current transmission line d in the time period td,min,Pd,maxRespectively the lower and upper power limits, P, of the DC transmission line dd,rThe maximum value of the climbing speed of the direct current transmission line d.
The active power equivalent model of the alternating-current transmission line is as follows:
all external alternating current transmission line sets of the region are defined as region alternating current gateways, and active power of the alternating current gateways is used as an optimization variable of calculation;
constraint conditions are as follows:
Pa,min≤Pa,t≤Pa,max
wherein NA is the number of regions participating in optimization, Pa,tFor the ac gateway active value of area a during time period t, Pa,min,Pa,maxThe lower and upper ac gateway power limits for zone a.
And 2, establishing a safety constraint unit combination optimization model considering the partition load balance based on the active power equivalent model.
The combined optimization model of the safety constraint unit of the alternating-current and direct-current hybrid power grid is as follows:
an objective function:
constraint conditions are as follows:
Pi,minui,t≤Pi,t≤Pi,maxui,t
-Δi≤Pi,t-Pi,t-1≤Δi
wherein NT is the number of time segments contained in the system scheduling period, NI is the total number of the generator sets, CiFor the operating cost of the generator set i, Pi,tFor the active power output of the generator set i in the time period t, SiFor the starting cost of the generator set i, yi,tFor the generator set i whether there is a change from shutdown to startup state in time period t, AaSet of devices for area a, Pd,t,nIs the equivalent load power P of the direct current transmission line d in the time period td,t,pFor the equivalent generator power of the direct current transmission line d in the time period t, ND is the total number of the direct current transmission line, Pa,tAc gateway active value, L, for region a at time period ta,tLoad demand for region a at time t, Pi,max，Pi,minRespectively an upper limit and a lower limit, R, of the output power of the generator set ia,tFor the spinning reserve demand of region a at time t, ui,tIs the starting and stopping state of the generator set i in a time period t, zi,τFor generator set i in time interval tau-DTi+1 whether there is a flag for a change from start-up to shut-down state, UTi，DTiMinimum on-time and minimum off-time, Δ, respectively, for the generator set iiThe maximum value of the ramp rate of the generator set i per time period,respectively the lower limit and the upper limit of the current of the ith transmission section, N is a power grid computing node set, Pn,tCalculating the generated power l of the node n for the grid at the time tn,tCalculating the load power of the node n for the grid at time t, Sn,l,tCalculating the injection power of the node n for the grid at time tSensitivity to the l-th power transmission section.
Step 3, solving a safety constraint unit combination optimization model by adopting a mixed integer linear programming method, and calculating the start-stop state (i.e. u) of the generator seti,t) Genset output plan (i.e., P)i,t) Power results of DC transmission lines (i.e. P)d,t,nAnd Pd,t,p) And the power result (i.e., P) of the regional AC gatewaya,t)。
Step 4, according to the optimization result, considering all network monitoring elements to perform security check; if the current of the monitoring element is not increased beyond the limit, outputting an optimization result; and otherwise, adding the constraint conditions of the newly added load flow out-of-limit monitoring element into the constraint unit combination optimization model, and turning to the step 3.
The constraint conditions of the newly added power flow out-of-limit monitoring element are as follows:
wherein,lower and upper current limits, S, respectively, for the kth monitoring elementn,k,tThe sensitivity of the injected power of node n to the monitoring element k is calculated for the grid at time t.
According to the method, the active power equivalent model of the direct-current transmission line is established, various special requirements of power adjustment of the direct-current transmission channel can be considered, the characteristic that direct-current transmission can be flexibly adjusted is fully exerted, frequent conversion of direct-current transmission current conversion equipment is avoided, and the performability of a direct-current transmission plan is improved.
The method is suitable for the multi-region alternating current-direct current hybrid power grid, can also be applied to the scheduling plan optimization of the multi-region direct current interconnected power grid, and has high adaptability.
According to the method, through interactive iterative solution of two subproblems of optimization calculation and safety check, the unit combination calculation result meets the safe operation requirement of the trans-regional power transmission line and also meets the network safety boundary inside each region, and the performability of the unit combination scheme is guaranteed.
According to the method, the optimization calculation of the operation mode of the direct current transmission line can be supported by considering the safety constraint unit combination optimization calculation of the partition load balance, and the combined optimization of a multi-region unit combination scheme and a cross-region alternating current and direct current transmission line power plan is realized.
In conclusion, the method can realize the optimal regulation and control of the power generation resources in a larger range, can realize the combined optimization of a multi-zone unit combination scheme and a cross-zone alternating current and direct current transmission line power plan, and greatly improves the large power grid control capability and the power resource optimal configuration capability.
Alternating current-direct current series-parallel connection electric wire netting safety restraint unit combination computing system includes:
an equivalent model construction module: and establishing an active power equivalent model of the direct current transmission line and the alternating current transmission line participating in optimized dispatching in the multi-region alternating current-direct current hybrid power grid.
The direct current transmission line active power equivalent model constructed by the equivalent model construction module is,
modeling a sending end of each direct current transmission line as an equivalent load, modeling a receiving end as an equivalent generator, and taking the equivalent load and the active power of the equivalent generator as calculated optimization variables;
constraint conditions are as follows:
αdPd,t,n+Pd,t,p＝0
Pd,min≤Pd,t,n≤Pd,max
-Pd,r≤Pd,t,n-Pd,t-1,n≤Pd,r
wherein, αdPower loss for DC transmission line dCoefficient of consumption, Pd,t,nIs the equivalent load power P of the direct current transmission line d in the time period td,t-1,nIs the equivalent load power P of the direct current transmission line d in the time period t-1d,t,pFor the equivalent generator power, P, of the direct current transmission line d in the time period td,min,Pd,maxRespectively the lower and upper power limits, P, of the DC transmission line dd,rThe maximum value of the climbing speed of the direct current transmission line d.
The active power equivalent model of the alternating current transmission line constructed by the equivalent model construction module is,
all external alternating current transmission line sets of the region are defined as region alternating current gateways, and active power of the alternating current gateways is used as an optimization variable of calculation;
constraint conditions are as follows:
Pa,min≤Pa,t≤Pa,max
wherein NA is the number of regions participating in optimization, Pa,tFor the ac gateway active value of area a during time period t, Pa,min,Pa,maxThe lower and upper ac gateway power limits for zone a.
An optimization model construction module: and establishing a safety constraint unit combination optimization model considering the partition load balance based on the active power equivalent model.
The safety constraint unit combination optimization model of the alternating current-direct current hybrid power grid constructed by the optimization model construction module comprises the following steps,
an objective function:
constraint conditions are as follows:
Pi,minui,t≤Pi,t≤Pi,maxui,t
-Δi≤Pi,t-Pi,t-1≤Δi
wherein NT is the number of time segments contained in the system scheduling period, NI is the total number of the generator sets, CiFor the operating cost of the generator set i, Pi,tFor the active power output of the generator set i in the time period t, SiFor the starting cost of the generator set i, yi,tFor the generator set i whether there is a change from shutdown to startup state in time period t, AaSet of devices for area a, Pd,t,nIs the equivalent load power P of the direct current transmission line d in the time period td,t,pFor the equivalent generator power of the direct current transmission line d in the time period t, ND is the total number of the direct current transmission line, Pa,tAc gateway active value, L, for region a at time period ta,tLoad demand for region a at time t, Pi,max，Pi,minRespectively an upper limit and a lower limit, R, of the output power of the generator set ia,tFor the rotation of area a in time period tTo obtain ui,tIs the starting and stopping state of the generator set i in a time period t, zi,τFor generator set i in time interval tau-DTi+1 whether there is a flag for a change from start-up to shut-down state, UTi，DTiMinimum on-time and minimum off-time, Δ, respectively, for the generator set iiThe maximum value of the ramp rate of the generator set i per time period,respectively the lower limit and the upper limit of the current of the ith transmission section, N is a power grid computing node set, Pn,tCalculating the generated power l of the node n for the grid at the time tn,tCalculating the load power of the node n for the grid at time t, Sn,l,tAnd calculating the sensitivity of the injection power of the node n to the ith power transmission section for the time t.
A solving module: and solving the combined optimization model of the safety constraint unit of the alternating-current and direct-current series-parallel power grid.
A checking module: according to the optimization result, considering all network monitoring elements to perform security check; and if the power flow of the monitoring element is not increased beyond the limit, outputting an optimization result.
An iteration module: and if the tidal current of the newly-added monitoring element exceeds the limit, adding the constraint conditions of the newly-added tidal current exceeding monitoring element into the constraint unit combination optimization model, and turning to the solving module.
The constraint condition of the newly added power flow out-of-limit monitoring element is,
wherein,lower and upper current limits, S, respectively, for the kth monitoring elementn,k,tThe sensitivity of the injected power of node n to the monitoring element k is calculated for the grid at time t.
A computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform a security constraint bank combination computing method.
A computing device comprising one or more processors, memory, and one or more programs stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for performing a security constraint bank combination calculation method.
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 (12)
1. The combined calculation method of the safety constraint unit of the alternating current-direct current hybrid power grid is characterized by comprising the following steps of: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
establishing an active power equivalent model of a direct current transmission line and an alternating current transmission line participating in optimized dispatching in a multi-region alternating current-direct current hybrid power grid;
establishing a safety constraint unit combination optimization model considering partition load balance based on an active power equivalent model;
solving a safety constraint unit combination optimization model;
according to the optimization result, considering all network monitoring elements to perform security check; and if the power flow of the monitoring element is not increased beyond the limit, outputting an optimization result.
2. The combined calculation method for the safety constraint unit of the alternating current-direct current hybrid power grid according to claim 1, characterized by comprising the following steps of: the equivalent model of the active power of the direct-current transmission line is as follows,
modeling a sending end of each direct current transmission line as an equivalent load, modeling a receiving end as an equivalent generator, and taking the equivalent load and the active power of the equivalent generator as calculated optimization variables;
constraint conditions are as follows:
αdPd,t,n+Pd,t,p＝0
Pd,min≤Pd,t,n≤Pd,max
-Pd,r≤Pd,t,n-Pd,t-1,n≤Pd,r
wherein, αdIs the power loss coefficient, P, of the DC transmission line dd,t,nIs the equivalent load power P of the direct current transmission line d in the time period td,t-1,nIs the equivalent load power P of the direct current transmission line d in the time period t-1d,t,pFor the equivalent generator power, P, of the direct current transmission line d in the time period td,min,Pd,maxRespectively the lower and upper power limits, P, of the DC transmission line dd,rThe maximum value of the climbing speed of the direct current transmission line d.
3. The combined calculation method for the safety constraint unit of the alternating current-direct current hybrid power grid according to claim 1, characterized by comprising the following steps of: the equivalent model of the active power of the alternating-current transmission line is as follows,
all external alternating current transmission line sets of the region are defined as region alternating current gateways, and active power of the alternating current gateways is used as an optimization variable of calculation;
constraint conditions are as follows:
Pa,min≤Pa,t≤Pa,max
wherein NA is the number of regions participating in optimization, Pa,tFor the ac gateway active value of area a during time period t, Pa,min,Pa,maxThe lower and upper ac gateway power limits for zone a.
4. The combined calculation method for the safety constraint unit of the alternating current-direct current hybrid power grid according to claim 1, characterized by comprising the following steps of: the safety constraint unit combination optimization model is as follows,
an objective function:
constraint conditions are as follows:
Pi,minui,t≤Pi,t≤Pi,maxui,t
-Δi≤Pi,t-Pi,t-1≤Δi
wherein NT is the number of time segments contained in the system scheduling period, NI is the total number of the generator sets, CiAs a generatorRunning cost of group i, Pi,tFor the active power output of the generator set i in the time period t, SiFor the starting cost of the generator set i, yi,tFor the generator set i whether there is a change from shutdown to startup state in time period t, AaSet of devices for area a, Pd,t,nIs the equivalent load power P of the direct current transmission line d in the time period td,t,pFor the equivalent generator power of the direct current transmission line d in the time period t, ND is the total number of the direct current transmission line, Pa,tAc gateway active value, L, for region a at time period ta,tLoad demand for region a at time t, Pi,max，Pi,minRespectively an upper limit and a lower limit, R, of the output power of the generator set ia,tFor the spinning reserve demand of region a at time t, ui,tIs the starting and stopping state of the generator set i in a time period t, zi,τFor generator set i in time interval tau-DTi+1 whether there is a flag for a change from start-up to shut-down state, UTi，DTiMinimum on-time and minimum off-time, Δ, respectively, for the generator set iiThe maximum value of the ramp rate of the generator set i per time period,respectively the lower limit and the upper limit of the current of the ith transmission section, N is a power grid computing node set, Pn,tCalculating the generated power l of the node n for the grid at the time tn,tCalculating the load power of the node n for the grid at time t, Sn,l,tAnd calculating the sensitivity of the injection power of the node n to the ith power transmission section for the time t.
5. The combined calculation method for the safety constraint unit of the alternating current-direct current hybrid power grid according to claim 1, characterized by comprising the following steps of: and if the tidal current of the newly-added monitoring element exceeds the limit, adding the constraint conditions of the newly-added tidal current exceeding monitoring element into the constraint unit combination optimization model, and solving the safety constraint unit combination optimization model again.
6. The combined calculation method for the safety constraint unit of the alternating current-direct current hybrid power grid according to claim 1, characterized by comprising the following steps of: the constraint condition of the newly added power flow out-of-limit monitoring element is,
wherein,respectively the lower limit and the upper limit of the current of the kth monitoring element, N is a power grid computing node set, Pn,tCalculating the generated power l of the node n for the grid at the time tn,tCalculating the load power of the node n for the grid at time t, Sn,k,tThe sensitivity of the injected power of node n to the kth monitoring element is calculated for the grid at time period t.
7. Alternating current-direct current series-parallel connection electric wire netting safety restraint unit combination computing system, its characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
an equivalent model construction module: establishing an active power equivalent model of a direct current transmission line and an alternating current transmission line participating in optimized dispatching in a multi-region alternating current-direct current hybrid power grid;
an optimization model construction module: establishing a safety constraint unit combination optimization model considering partition load balance based on an active power equivalent model;
a solving module: solving a safety constraint unit combination optimization model;
a checking module: according to the optimization result, considering all network monitoring elements to perform security check; and if the power flow of the monitoring element is not increased beyond the limit, outputting an optimization result.
8. The combined computing system of the safety constraint unit of the AC-DC hybrid power grid according to claim 7, characterized in that: the direct current transmission line active power equivalent model constructed by the equivalent model construction module is,
modeling a sending end of each direct current transmission line as an equivalent load, modeling a receiving end as an equivalent generator, and taking the equivalent load and the active power of the equivalent generator as calculated optimization variables;
constraint conditions are as follows:
αdPd,t,n+Pd,t,p＝0
Pd,min≤Pd,t,n≤Pd,max
-Pd,r≤Pd,t,n-Pd,t-1,n≤Pd,r
wherein, αdIs the power loss coefficient, P, of the DC transmission line dd,t,nIs the equivalent load power P of the direct current transmission line d in the time period td,t-1,nIs the equivalent load power P of the direct current transmission line d in the time period t-1d,t,pFor the equivalent generator power, P, of the direct current transmission line d in the time period td,min,Pd,maxRespectively the lower and upper power limits, P, of the DC transmission line dd,rThe maximum value of the climbing speed of the direct current transmission line d.
9. The combined computing system of the safety constraint unit of the AC-DC hybrid power grid according to claim 7, characterized in that: the active power equivalent model of the alternating current transmission line constructed by the equivalent model construction module is,
all external alternating current transmission line sets of the region are defined as region alternating current gateways, and active power of the alternating current gateways is used as an optimization variable of calculation;
constraint conditions are as follows:
Pa,min≤Pa,t≤Pa,max
wherein NA is the number of regions participating in optimization, Pa,tFor the ac gateway active value of area a during time period t, Pa,min,Pa,maxThe lower and upper ac gateway power limits for zone a.
10. The combined computing system of the safety constraint unit of the AC-DC hybrid power grid according to claim 7, characterized in that: the safety constraint unit combination optimization model constructed by the optimization model construction module comprises the following steps of,
an objective function:
constraint conditions are as follows:
Pi,minui,t≤Pi,t≤Pi,maxui,t
-Δi≤Pi,t-Pi,t-1≤Δi
wherein NT is the number of time segments contained in the system scheduling period, NI is the total number of the generator sets, CiFor the operating cost of the generator set i, Pi,tFor the active power output of the generator set i in the time period t, SiFor the starting cost of the generator set i, yi,tFor the generator set i whether there is a change from shutdown to startup state in time period t, AaSet of devices for area a, Pd,t,nIs the equivalent load power P of the direct current transmission line d in the time period td,t,pFor the equivalent generator power of the direct current transmission line d in the time period t, ND is the total number of the direct current transmission line, Pa,tFor region a during time period tAc gateway active value, La,tLoad demand for region a at time t, Pi,max，Pi,minRespectively an upper limit and a lower limit, R, of the output power of the generator set ia,tFor the spinning reserve demand of region a at time t, ui,tIs the starting and stopping state of the generator set i in a time period t, zi,τFor generator set i in time interval tau-DTi+1 whether there is a flag for a change from start-up to shut-down state, UTi，DTiMinimum on-time and minimum off-time, Δ, respectively, for the generator set iiThe maximum value of the ramp rate of the generator set i per time period,respectively the lower limit and the upper limit of the current of the ith transmission section, N is a power grid computing node set, Pn,tCalculating the generated power l of the node n for the grid at the time tn,tCalculating the load power of the node n for the grid at time t, Sn,l,tAnd calculating the sensitivity of the ith transmission section of the injection power of the node n in the time period t.
11. The combined computing system of the safety constraint unit of the AC-DC hybrid power grid according to claim 7, characterized in that: the device further comprises an iteration module: and if the tidal current of the newly-added monitoring element exceeds the limit, adding the constraint conditions of the newly-added tidal current exceeding monitoring element into the constraint unit combination optimization model, and turning to the solving module.
12. The combined computing system of the safety constraint unit of the AC-DC hybrid power grid according to claim 11, characterized in that: the constraint condition of the newly added power flow out-of-limit monitoring element is,
wherein,respectively the kth supervisorAccording to the lower limit and the upper limit of the power flow of the element, N is a power grid computing node set, Pn,tCalculating the generated power l of the node n for the grid at the time tn,tCalculating the load power of the node n for the grid at time t, Sn,k,tThe sensitivity of the injected power of node n to the kth monitoring element is calculated for the grid at time period t.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910207882.1A CN109904856B (en) | 2019-03-19 | 2019-03-19 | Combined calculation method and system for safety constraint unit of alternating-current and direct-current series-parallel power grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910207882.1A CN109904856B (en) | 2019-03-19 | 2019-03-19 | Combined calculation method and system for safety constraint unit of alternating-current and direct-current series-parallel power grid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109904856A true CN109904856A (en) | 2019-06-18 |
| CN109904856B CN109904856B (en) | 2022-09-30 |
Family
ID=66952760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910207882.1A Active CN109904856B (en) | 2019-03-19 | 2019-03-19 | Combined calculation method and system for safety constraint unit of alternating-current and direct-current series-parallel power grid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109904856B (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110535121A (en) * | 2019-08-27 | 2019-12-03 | 东北大学 | A kind of two stages multiobjective Dynamic Optimization dispatching method of AC-DC hybrid power grid |
| CN110543696A (en) * | 2019-08-15 | 2019-12-06 | 国电南瑞科技股份有限公司 | Method for enabling unmodeled small unit to participate in clearing and safety check of power market |
| CN110556823A (en) * | 2019-08-15 | 2019-12-10 | 中国南方电网有限责任公司 | Rapid calculation method and system for safety constraint unit combination based on model dimension reduction |
| CN110570037A (en) * | 2019-09-05 | 2019-12-13 | 国网江苏省电力有限公司 | Power plant medium and long term limit transaction electric quantity optimization method and system based on SCUC |
| CN110854853A (en) * | 2019-12-02 | 2020-02-28 | 山东大学 | Generating method and system for starting scheme of generator set |
| CN110874692A (en) * | 2019-11-05 | 2020-03-10 | 中国南方电网有限责任公司 | Alternating current-direct current hybrid regional power grid spot market clearing calculation optimization method and device |
| CN110994587A (en) * | 2019-10-28 | 2020-04-10 | 国网新疆电力有限公司 | Safety check method for power grid day-ahead power generation plan |
| CN111181200A (en) * | 2020-02-19 | 2020-05-19 | 河海大学 | Practical analysis method, device and system for power generation feasible region |
| CN112491091A (en) * | 2020-10-23 | 2021-03-12 | 中国南方电网有限责任公司 | Method for rapidly solving day-ahead safety constraint unit combination of large-scale regional power grid |
| CN113890119A (en) * | 2021-08-18 | 2022-01-04 | 广东电网有限责任公司 | Energy storage capacity configuration method, device and system for alternating current-direct current hybrid power grid |
| CN113946981A (en) * | 2021-11-17 | 2022-01-18 | 国网四川省电力公司电力科学研究院 | Site selection and volume fixing method and system for accessing hydroelectric hydrogen production load into power grid |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108683192A (en) * | 2018-06-27 | 2018-10-19 | 广东电网有限责任公司 | A kind of power spot market goes out clearing method, system, equipment and storage medium |
| CN109390932A (en) * | 2018-09-18 | 2019-02-26 | 中国南方电网有限责任公司 | A kind of security constraint Unit Combination calculation method considering DC link power optimization |
| CN109447510A (en) * | 2018-11-13 | 2019-03-08 | 国电南瑞科技股份有限公司 | Medium-term and long-term power secure check method, apparatus and system based on SCUC |
-
2019
- 2019-03-19 CN CN201910207882.1A patent/CN109904856B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108683192A (en) * | 2018-06-27 | 2018-10-19 | 广东电网有限责任公司 | A kind of power spot market goes out clearing method, system, equipment and storage medium |
| CN109390932A (en) * | 2018-09-18 | 2019-02-26 | 中国南方电网有限责任公司 | A kind of security constraint Unit Combination calculation method considering DC link power optimization |
| CN109447510A (en) * | 2018-11-13 | 2019-03-08 | 国电南瑞科技股份有限公司 | Medium-term and long-term power secure check method, apparatus and system based on SCUC |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110543696A (en) * | 2019-08-15 | 2019-12-06 | 国电南瑞科技股份有限公司 | Method for enabling unmodeled small unit to participate in clearing and safety check of power market |
| CN110556823A (en) * | 2019-08-15 | 2019-12-10 | 中国南方电网有限责任公司 | Rapid calculation method and system for safety constraint unit combination based on model dimension reduction |
| CN110556823B (en) * | 2019-08-15 | 2023-11-14 | 中国南方电网有限责任公司 | Model dimension reduction based safety constraint unit combination rapid calculation method and system |
| CN110543696B (en) * | 2019-08-15 | 2022-09-16 | 国电南瑞科技股份有限公司 | Method for small unmodeled unit to participate in electric power market clearing and safety check |
| CN110535121A (en) * | 2019-08-27 | 2019-12-03 | 东北大学 | A kind of two stages multiobjective Dynamic Optimization dispatching method of AC-DC hybrid power grid |
| CN110570037A (en) * | 2019-09-05 | 2019-12-13 | 国网江苏省电力有限公司 | Power plant medium and long term limit transaction electric quantity optimization method and system based on SCUC |
| CN110994587A (en) * | 2019-10-28 | 2020-04-10 | 国网新疆电力有限公司 | Safety check method for power grid day-ahead power generation plan |
| CN110994587B (en) * | 2019-10-28 | 2023-02-28 | 国网新疆电力有限公司 | Safety check method for power grid day-ahead power generation plan |
| CN110874692B (en) * | 2019-11-05 | 2022-08-05 | 中国南方电网有限责任公司 | Alternating current-direct current hybrid regional power grid spot market clearing calculation optimization method and device |
| CN110874692A (en) * | 2019-11-05 | 2020-03-10 | 中国南方电网有限责任公司 | Alternating current-direct current hybrid regional power grid spot market clearing calculation optimization method and device |
| CN110854853A (en) * | 2019-12-02 | 2020-02-28 | 山东大学 | Generating method and system for starting scheme of generator set |
| CN111181200B (en) * | 2020-02-19 | 2022-09-16 | 河海大学 | Practical analysis method, device and system for power generation feasible region |
| CN111181200A (en) * | 2020-02-19 | 2020-05-19 | 河海大学 | Practical analysis method, device and system for power generation feasible region |
| CN112491091B (en) * | 2020-10-23 | 2022-11-15 | 中国南方电网有限责任公司 | Method for rapidly solving day-ahead safety constraint unit combination of large-scale regional power grid |
| CN112491091A (en) * | 2020-10-23 | 2021-03-12 | 中国南方电网有限责任公司 | Method for rapidly solving day-ahead safety constraint unit combination of large-scale regional power grid |
| CN113890119A (en) * | 2021-08-18 | 2022-01-04 | 广东电网有限责任公司 | Energy storage capacity configuration method, device and system for alternating current-direct current hybrid power grid |
| CN113890119B (en) * | 2021-08-18 | 2024-04-26 | 广东电网有限责任公司 | Energy storage capacity configuration method, device and system of alternating current-direct current hybrid power grid |
| CN113946981A (en) * | 2021-11-17 | 2022-01-18 | 国网四川省电力公司电力科学研究院 | Site selection and volume fixing method and system for accessing hydroelectric hydrogen production load into power grid |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109904856B (en) | 2022-09-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109904856B (en) | Combined calculation method and system for safety constraint unit of alternating-current and direct-current series-parallel power grid | |
| Li et al. | Cooperative dispatch of distributed energy storage in distribution network with PV generation systems | |
| Luna et al. | Online energy management systems for microgrids: Experimental validation and assessment framework | |
| Li et al. | Optimal control and management of a large-scale battery energy storage system to mitigate fluctuation and intermittence of renewable generations | |
| Huang et al. | Economic dispatch of power systems with virtual power plant based interval optimization method | |
| CN110313111A (en) | For producing and distributing the control system and its control method of the micro-capacitance sensor of the electrical power from different types of multiple production sources | |
| Egea-Alvarez et al. | Primary and secondary power control of multiterminal HVDC grids | |
| Zhang et al. | Achieving real-time economic dispatch in power networks via a saddle point design approach | |
| CN108108846B (en) | AC-DC hybrid microgrid robust optimization coordination scheduling method | |
| Pinto et al. | Optimal operation of DC networks to support power system outage management | |
| CN110400056A (en) | Cascade hydropower based on honourable space-time characterisation Optimization Scheduling and device a few days ago | |
| CN108493998B (en) | Robust power transmission network planning method considering demand response and N-1 expected faults | |
| CN110705808A (en) | Power transmission network planning scheme generation system and method considering maintenance under new energy access | |
| Abdel-Khalik et al. | A droop control design for multiterminal HVDC of offshore wind farms with three-wire bipolar transmission lines | |
| CN104104102A (en) | Voltage source converter type multiport direct current transmission system steady state working point optimization method | |
| CN111667136A (en) | Clearing method and device for regional power market and storage medium | |
| CN104659858A (en) | Distribution power supply system and method | |
| CN115528674A (en) | Offshore wind farm virtual inertia optimal distribution method and system based on load shedding operation | |
| CN113762632B (en) | Collaborative optimization operation method and system of electric comprehensive energy system | |
| Zhang et al. | Adaptive Voltage Reference Based Controls of Converter Power Sharing and Pilot Voltage in HVDC System for Large-Scale Offshore Wind | |
| CN108964151A (en) | A kind of micro-capacitance sensor grid structure design method and system | |
| CN111291939A (en) | Method and system for planning links | |
| Lin et al. | Decentralized economic dispatch for transmission and distribution networks via modified generalized benders decomposition | |
| CN109301855B (en) | Starting method and system of hybrid high-voltage flexible direct-current power grid | |
| He et al. | A Coordinated Consensus Control Strategy for Distributed Battery Energy Storages Considering Different Frequency Control Demands |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |