WO2019165701A1 - 一种交直流混联微网的随机鲁棒耦合型优化调度方法 - Google Patents
一种交直流混联微网的随机鲁棒耦合型优化调度方法 Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/003—Load forecast, e.g. methods or systems for forecasting future load demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/10—The dispersed energy generation being of fossil origin, e.g. diesel generators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/10—The network having a local or delimited stationary reach
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
-
- 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
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
Definitions
- the invention relates to the technical field of microgrid energy management, in particular to a stochastic robust coupled optimization scheduling method for AC/DC hybrid microgrid.
- microgrid In order to reduce the pollution of fossil energy to the environment, more and more renewable energy replaces the traditional energy access to the power system, and the penetration rate of renewable energy in the power grid is greatly improved.
- microgrid As a small autonomous system that aggregates distributed power and load, microgrid has become an effective method to solve the problem of renewable energy access to power systems. In order to ensure the stable and efficient operation of the microgrid, it is necessary to carry out the necessary energy management to establish a reasonable operation scheduling plan.
- microgrid Due to the intermittent nature of renewable energy output and the dynamic changes of load in the system, there are many uncertain factors in the microgrid, which brings great challenges to microgrid scheduling.
- the current research is mainly on traditional AC micro-networks, and with the rapid development of power electronics technology, more and more DC-type power sources (such as photovoltaics, fuel cells, energy storage, etc.) and DC-type loads (electric vehicles, household appliances, etc.) Access to the micro network.
- DC-type power sources such as photovoltaics, fuel cells, energy storage, etc.
- DC-type loads electric vehicles, household appliances, etc.
- the AC-DC hybrid micro-grid has become one of the research hotspots of the current micro-grid.
- Stochastic optimization and robust optimization methods are applied to the micro-network optimization scheduling to cope with the uncertainty problem.
- Robust optimization can obtain the minimum daily running cost in the worst case scenario, but the worst scenario in reality is rare, so robust optimization is highly conservative; while stochastic optimization is less conservative than robust optimization, but Robustness is insufficient when dealing with uncertainties, and stochastic optimization requires a more accurate uncertainty probability distribution function, which is difficult to obtain in practice.
- the technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a stochastic robust coupled optimization scheduling method for AC/DC hybrid microgrid, which takes into account the AC and DC regions of the AC-DC hybrid microgrid.
- the source-load uncertainty is based on a stochastic uncertainty set to establish a stochastic robust coupled optimal scheduling model, which can realize stochastic robust optimal scheduling of AC-DC hybrid micro-grids, improve the robustness of traditional stochastic optimization, and reduce The conservative nature of traditional robust optimization.
- a stochastic robust coupled optimization scheduling method for an AC-DC hybrid microgrid according to the present invention includes the following steps:
- Step 20 Obtain an operating cost coefficient of each device in the AC-DC hybrid microgrid, and substitute the stochastic uncertainty set constructed in step 10) to establish an objective function of the stochastic robust coupled optimization scheduling model;
- Step 30 Obtain an operation limit of each device in the AC-DC hybrid microgrid, and establish a constraint condition of the stochastic robust coupling optimization scheduling model;
- Step 40 Solving the stochastic robust coupled optimization scheduling problem formed by the step 20) objective function and the step 30) constraint condition: solving the stochastic robust coupling type optimization problem by using the column constraint generation algorithm to obtain the AC-DC hybrid microgrid Stochastic robust coordination of operational plans.
- the source-load power prediction data of the AC-DC hybrid microgrid includes AC-DC mixing.
- the predicted nominal value of the renewable energy output and load power and the budget period of the uncertainty period in the AC and DC areas of the Lianwei network, in addition to the number of predicted deviation intervals, the occurrence probability of each deviation interval, the predicted upper deviation value and the prediction Lower deviation value, the predicted source power prediction data is substituted into the following equation to construct a random uncertainty set:
- W s1 , P s2 are random uncertainty sets for wind turbine output, photovoltaic output, DC load and AC load, respectively.
- It is the predicted nominal value of wind turbine output, photovoltaic output, DC load and AC load at t time
- ⁇ w , ⁇ p , ⁇ l, dc and ⁇ l, ac is the uncertainty of wind turbine output, photovoltaic output, DC load and AC load.
- N t is the total period of a scheduling period; with They are the actual value of the fan output, the predicted upper deviation value, the predicted lower deviation value, the upper deviation introduction parameter and the lower deviation introduction parameter, and p s1 is the occurrence probability of the deviation interval in the s1 deviation interval of the t-time period wind turbine prediction; with The actual value of the PV output in the s2th deviation interval of the t-period PV prediction, the predicted upper deviation value, the predicted lower deviation value, the upper deviation introduction parameter and the lower deviation introduction parameter, respectively, p s2 is the occurrence probability of the deviation interval; with The actual value of the DC load power, the predicted upper deviation value, the predicted lower deviation value, the upper deviation introduction parameter and the lower deviation introduction parameter in the s3th deviation interval of the t-time period DC load prediction, respectively, p s3 is the occurrence probability of the deviation interval; with They are the actual value of the AC load power, the predicted upper deviation value, the predicted lower deviation value, the upper deviation introduction parameter
- the operating cost coefficient of each device in the AC-DC hybrid microgrid includes the diesel fuel All operating cost factors related to generator, energy storage, bidirectional converter, fan, photovoltaic and AC/DC load, substituting the operating cost coefficient into the following formula to establish a random robust coupled optimization scheduling model in the form of min-max-min Objective function:
- the value of I DE,t is 1 indicates that the diesel generator is in the t period Start, 0 means not activated; M DE, t take a value of 1 means that the diesel generator is shut down during the t period, 0 means not shut down; U DE, t is 1 means the diesel generator is in the t period It is in the power-on state, and when it is 0, it indicates that it is in the stop state; A value of 1 indicates that there is a forward commutation during the t period, and 0 indicates that there is no forward commutation. A value of 1 indicates that there is a negative commutation in the t period, and 0 indicates that there is no negative commutation.
- the running limit values of the devices in the AC-DC hybrid microgrid obtained include All operating limits related to diesel generators, energy storage, bidirectional converters, fans, photovoltaics, and AC and DC loads are substituted into the following equations to establish the constraints of the stochastic robust coupled optimal scheduling model:
- Equation (4) is the power generation constraint of the fan and photovoltaic;
- the equations (5)-(7) are the minimum continuous startup time, the minimum continuous shutdown time and the maximum continuous startup time constraint of the diesel generator. with They are the minimum continuous start-up period limit of the diesel generator, the minimum continuous shutdown period limit and the maximum continuous start-up period limit, r represents the start period of the diesel generator flag; and
- Equation (10) is the energy storage state constraint
- S min and S max are the lower and upper limits of the energy storage allowable state
- S(t) and S(t-1) is the state of charge of energy storage in the period t and t-1
- ⁇ C and ⁇ D are the charging and discharging efficiency limits of energy storage
- S(0) is the initial state of charge of energy storage.
- S(N t ) is the state of charge of the stored energy at the end of the scheduling period
- equations (11)-(12) are the commutation power and power fluctuation constraints of the bidirectional converter.
- Equations (15)-(16) are the power balance constraints for DC and AC zones. with The forward and negative commutation efficiency limits for the bidirectional converter.
- the specific content of the step 40) includes:
- Step 401) Write the stochastic robust optimization scheduling model in the form of min-max-min represented by equations (1)-(16) into the following matrix representation:
- Equation (18) represents the constraint conditions only related to x, A , b, B, and e are the constant matrices in the constraint; Equation (19) represents the constraint condition only related to y s , D, f, E, and g are the constant matrices in the constraint; Equation (20) represents The constraints associated with x and y s , F, h, and G are the constant matrices in the constraint; Equation (21) represents the constraints associated with w s1 , p s2 , and y s , both J and K are the constraints Constant matrix in; formula (22) represents The constraint associated with y s , M and N are the constant
- Step 402 Based on the model of the matrix representation in step 401), the sub-problem of the stochastic robust optimization scheduling model is formed by using the column constraint generation algorithm:
- ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ dc and ⁇ ac are the dual variables of y s in the formulas (19)-(22);
- Step 403) Based on the model of the matrix representation in step 401) and the sub-problem of step 402), the column constraint generation algorithm is used to form the main problem of the stochastic robust optimization scheduling model:
- l is the total number of iterations
- k is the current number of iterations
- n is the total number of random intervals.
- the main problem is optimized by substituting x as a known variable.
- the sub-problems are w s1 , p s2 , and Optimization result, It is the optimization result of y s in the sub-problem after the kth iteration;
- ⁇ s is the optimization variable related to the sub-question objective function value;
- the wind, photovoltaic, DC load and AC load take the s1, s2, s3 and s4 deviations respectively
- the corresponding scene in the interval is marked as the sth scene;
- Step 404) Using the integer optimization modeling toolbox YALMIP to call the solver SCIP iterative solution to the sub-problem of step 402) and the main problem of step 403) to obtain a robust coordinated operation mode of the AC-DC hybrid microgrid.
- the present invention has the following technical effects:
- the present invention establishes a stochastic robust coupled optimal scheduling model based on the constructed stochastic uncertainty set, which improves the robustness of traditional stochastic optimization and reduces the conservativeness of traditional robust optimization;
- the method constructs a random uncertainty set based on the predicted deviation interval of the source load and its occurrence probability.
- the construction of the random uncertainty set only needs the prediction bias value of multiple intervals and its occurrence probability. Both of the prediction systems are easier to obtain than the exact probability distribution function.
- Figure 1 is a flow chart of an embodiment of the present invention
- FIG. 2 is a topological structural diagram of an AC-DC hybrid microgrid according to an embodiment of the present invention.
- a stochastic robust coupled optimal scheduling model is established. This model improves the robustness of traditional stochastic optimization and reduces the traditional robust optimization. Conservative.
- the method constructs a random uncertainty set based on the prediction bias interval of the source load and its occurrence probability. In practice, the construction of the random uncertainty set only needs the prediction bias value of multiple intervals and its occurrence probability, in the engineering prediction system. Both are easier to obtain than accurate probability distribution functions.
- the topology structure of the AC-DC hybrid micro-grid is as shown in FIG. 2 .
- the method includes the following steps:
- Step 20 Obtain an operating cost coefficient of each device in the AC-DC hybrid microgrid, and substitute the stochastic uncertainty set constructed in step 10) to establish an objective function of the stochastic robust coupled optimization scheduling model;
- Step 30 Obtain an operation limit of each device in the AC-DC hybrid microgrid, and establish a constraint condition of the stochastic robust coupling optimization scheduling model;
- Step 40 Solving the stochastic robust coupled optimization scheduling problem formed by the step 20) objective function and the step 30) constraint condition: solving the stochastic robust coupling type optimization problem by using the column constraint generation algorithm to obtain the AC-DC hybrid microgrid Stochastic robust coordination of operational plans.
- the source-load power prediction data of the AC-DC hybrid microgrid includes AC-DC mixing.
- the predicted nominal value of the renewable energy output and load power and the budget period of the uncertainty period in the AC and DC areas of the Lianwei network, in addition to the number of predicted deviation intervals, the occurrence probability of each deviation interval, the predicted upper deviation value and the prediction Lower deviation value, the predicted source power prediction data is substituted into the following equation to construct a random uncertainty set:
- W s1 , P s2 are random uncertainty sets for wind turbine output, photovoltaic output, DC load and AC load, respectively.
- It is the predicted nominal value of wind turbine output, photovoltaic output, DC load and AC load at t time
- ⁇ w , ⁇ p , ⁇ l, dc and ⁇ l, ac is the uncertainty of wind turbine output, photovoltaic output, DC load and AC load.
- N t is the total period of a scheduling period; with They are the actual value of the fan output, the predicted upper deviation value, the predicted lower deviation value, the upper deviation introduction parameter and the lower deviation introduction parameter, and p s1 is the occurrence probability of the deviation interval in the s1 deviation interval of the t-time period wind turbine prediction; with The actual value of the PV output in the s2th deviation interval of the t-period PV prediction, the predicted upper deviation value, the predicted lower deviation value, the upper deviation introduction parameter and the lower deviation introduction parameter, respectively, p s2 is the occurrence probability of the deviation interval; with The actual value of the DC load power, the predicted upper deviation value, the predicted lower deviation value, the upper deviation introduction parameter and the lower deviation introduction parameter in the s3th deviation interval of the t-time period DC load prediction, respectively, p s3 is the occurrence probability of the deviation interval; with They are the actual value of the AC load power, the predicted upper deviation value, the predicted lower deviation value, the upper deviation introduction parameter
- the operating cost coefficient of each device in the AC-DC hybrid microgrid includes the diesel fuel All operating cost factors related to generator, energy storage, bidirectional converter, fan, photovoltaic and AC/DC load, substituting the operating cost coefficient into the following formula to establish a random robust coupled optimization scheduling model in the form of min-max-min Objective function:
- the value of I DE,t is 1 indicates that the diesel generator is in the t period Start, 0 means not activated; M DE, t take a value of 1 means that the diesel generator is shut down during the t period, 0 means not shut down; U DE, t is 1 means the diesel generator is in the t period It is in the power-on state, and when it is 0, it indicates that it is in the stop state; A value of 1 indicates that there is a forward commutation during the t period, and 0 indicates that there is no forward commutation. A value of 1 indicates that there is a negative commutation in the t period, and 0 indicates that there is no negative commutation.
- the running limit values of the devices in the AC-DC hybrid microgrid obtained include All operating limits related to diesel generators, energy storage, bidirectional converters, fans, photovoltaics, and AC and DC loads are substituted into the following equations to establish the constraints of the stochastic robust coupled optimal scheduling model:
- Equation (4) is the power generation constraint of the fan and photovoltaic;
- the equations (5)-(7) are the minimum continuous startup time, the minimum continuous shutdown time and the maximum continuous startup time constraint of the diesel generator. with They are the minimum continuous start-up period limit of the diesel generator, the minimum continuous shutdown period limit and the maximum continuous start-up period limit, r represents the start period of the diesel generator flag; and
- Equation (10) is the energy storage state constraint
- S min and S max are the lower and upper limits of the energy storage allowable state
- S(t) and S(t-1) is the state of charge of energy storage in the period t and t-1
- ⁇ C and ⁇ D are the charging and discharging efficiency limits of energy storage
- S(0) is the initial state of charge of energy storage.
- S(N t ) is the state of charge of the stored energy at the end of the scheduling period
- equations (11)-(12) are the commutation power and power fluctuation constraints of the bidirectional converter.
- Equations (15)-(16) are the power balance constraints for DC and AC zones. with The forward and negative commutation efficiency limits for the bidirectional converter.
- the specific content of the step 40) includes:
- Step 401) Write the stochastic robust optimization scheduling model in the form of min-max-min represented by equations (1)-(16) into the following matrix representation:
- Equation (18) represents the constraint conditions only related to x, A , b, B, and e are the constant matrices in the constraint; Equation (19) represents the constraint condition only related to y s , D, f, E, and g are the constant matrices in the constraint; Equation (20) represents The constraints associated with x and y s , F, h, and G are the constant matrices in the constraint; Equation (21) represents the constraints associated with w s1 , p s2 , and y s , both J and K are the constraints Constant matrix in; formula (22) represents The constraint associated with y s , M and N are the constant
- Step 402 Based on the model of the matrix representation in step 401), the sub-problem of the stochastic robust optimization scheduling model is formed by using the column constraint generation algorithm:
- ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ dc and ⁇ ac are the dual variables of y s in the formulas (19)-(22);
- Step 403) Based on the model of the matrix representation in step 401) and the sub-problem of step 402), the column constraint generation algorithm is used to form the main problem of the stochastic robust optimization scheduling model:
- l is the total number of iterations
- k is the current number of iterations
- n is the total number of random intervals.
- the main problem is optimized by substituting x as a known variable.
- the sub-problems are w s1 , p s2 , and Optimization result, It is the optimization result of y s in the sub-problem after the kth iteration;
- ⁇ s is the optimization variable related to the sub-question objective function value;
- the wind, photovoltaic, DC load and AC load take the s1, s2, s3 and s4 deviations respectively
- the corresponding scene in the interval is marked as the sth scene;
- Step 404) Using the integer optimization modeling toolbox YALMIP to call the solver SCIP iterative solution to the sub-problem of step 402) and the main problem of step 403) to obtain a robust coordinated operation mode of the AC-DC hybrid microgrid.
- the method of the embodiment of the present invention proposes a stochastic robust coupled optimal scheduling model for the AC-DC hybrid microgrid, taking into account the source-load uncertainty of the AC and DC regions, based on the prediction bias of the source-load output. Interval and its occurrence probability to construct a random uncertainty set.
- the first stage determines the start and stop of the diesel generator and the running state of the bidirectional converter.
- the second stage optimizes the operating power of each equipment unit and uses the column constraint generation algorithm to solve the problem quickly. The lowest operating cost and piconet operation plan in the worst case scenario can be obtained.
Abstract
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Claims (6)
- 一种交直流混联微网的随机鲁棒耦合型优化调度方法,其特征在于,包括以下步骤:步骤10)、获取交直流混联微网的源荷功率预测数据,构造随机不确定性集;步骤20)、获取交直流混联微网中各设备的运行成本系数,代入步骤10)所构造的随机不确定性集,建立随机鲁棒耦合型优化调度模型的目标函数;步骤30)、获取交直流混联微网中各设备的运行限值,建立随机鲁棒耦合型优化调度模型的约束条件;步骤40)、求解由步骤20)目标函数和步骤30)约束条件形成的随机鲁棒耦合型优化调度问题:利用列约束生成算法求解随机鲁棒耦合型优化问题,获得交直流混联微网的随机鲁棒协调运行计划。
- 根据权利要求1所述的一种交直流混联微网的随机鲁棒耦合型优化调度方法,其特征在于,所述步骤10)中,交直流混联微网的源荷功率预测数据包括交直流混联微网中交流区和直流区可再生能源出力及负荷功率的预测标称值及不确定性时段预算数,此外还有预测偏差区间数、各个偏差区间的发生概率、预测上偏差值和预测下偏差值,将所述的源荷功率预测数据代入下式中构造随机不确定性集:式中,W s1、P s2、 和 分别为风机出力、光伏出力、直流负荷和交流负荷的随机不确定性集,其中 和 是t时段风机出力、光伏出力、直流负荷和交流负荷的预测标称值,Π w、Π p、Π l,dc和Π l,ac为风机出力、光伏出力、直流负荷和交流负荷的不确定性时段预算数,N t为一个调度周期总时段; 和 分别是t时段风机预测第s1个偏差区间中风机出力的实际值、预测上偏差值、预测下偏差值、上偏差引入参数和下偏差引入参数,p s1为该偏差区间的发生概率; 和 分别是t时段光伏预测第s2个偏差区间中光伏出力的实际值、预测上偏差值、 预测下偏差值、上偏差引入参数和下偏差引入参数,p s2为该偏差区间的发生概率; 和 分别是t时段直流负荷预测第s3个偏差区间中直流负荷功率的实际值、预测上偏差值、预测下偏差值、上偏差引入参数和下偏差引入参数,p s3为该偏差区间的发生概率; 和 分别是t时段交流负荷预测第s4个偏差区间中交流负荷功率的实际值、预测上偏差值、预测下偏差值、上偏差引入参数和下偏差引入参数,p s4为该偏差区间的发生概率。
- 根据权利要求2所述的一种交直流混联微网的随机鲁棒耦合型优化调度方法,其特征在于,所述步骤20)中,交直流混联微网中各设备的运行成本系数包括与柴油发电机、储能、双向换流器、风机、光伏及交直流负荷相关的所有的运行成本系数,将运行成本系数代入下式建立min-max-min形式的随机鲁棒耦合型优化调度模型的目标函数:式(2)中相关参数根据下式计算得到:式中, 和 分别为柴油发电机的启动、关停和燃料成本; 和 分别为柴油发电机、储能、双向换流器、风机和光伏的运行维护成本; 为储能损耗成本; 为负荷切除停电惩罚成本; 和 分别为风机出力、光伏出力、直流负荷和交流负荷的预测偏差区间数; 和 分别为柴油发电 机的启动和关停成本系数;I DE,t为t时段柴油发电机的启动标志位;M DE,t为t时段柴油发电机的关停标志位;U DE,t表示t时段柴油发电机的运行状态标志位; 是t时段双向换流器正向换流运行状态标志位, 是t时段双向换流器负向换流运行状态标志位,其中功率由交流区流向直流区为正向换流,反之为负向换流; 为柴油发电机的燃料成本系数;a DE和b DE为柴油发电机的油耗特性成本系数;P DE,t为柴油发电机在t时段的运行功率; 为柴油发电机的额定功率;Δt为两时段的时间间隔; 和 分别为柴油发电机、储能、双向换流器、风机和光伏的运行维护成本系数; 为储能损耗成本系数; 为负荷切除停电惩罚成本系数; 和 分别为储能在t时段的充电功率和放电功率; 为双向换流器在t时段的正向换流功率, 为双向换流器的负向换流功率;P WT,t和P PV,t分别是风机和光伏在t时段的发电功率; 和 分别表示t时段交流区和直流区被切除的负荷功率; 和 是t时段交流和直流可调度负荷运行功率。
- 根据权利要求3所述的一种交直流混联微网的随机鲁棒耦合型优化调度方法,其特征在于,所述步骤30)中,获取的交直流混联微网中各设备的运行限值包括与柴油发电机、储能、双向换流器、风机、光伏及交直流负荷相关的所有的运行限值,将运行限值代入下式建立随机鲁棒耦合型优化调度模型的约束条件:I DE,t+M DE,t≤1,I DE,t-M DE,t=U DE,t-U DE,t-1 (7)式(4)为风机和光伏的发电功率约束;式(5)-(7)为柴油发电机的最小持续开机时间、最小持续关机时间和最大持续开机时间约束, 和 分别为柴油发电机的最小持续开机时段数限值、最小持续关机时段数限值和最大持续开机时段数限值,r表示柴油发电机标志位的开始时段;式(8)为柴油发电机运行功率上下限及爬坡速度约束, 和 为柴油发电机开机状态下运行功率的上下限值, 和 为柴油发电机单位时段内下爬坡和上爬坡的速率限值;式(9)为储能最大充放电功率约束, 和 为储能的最大充电和放电功率限值;式(10)为储能荷电状态约束,S min和S max为储能允许荷电状态的下限值和上限值,S(t)和S(t-1)为t和t-1时段储能的荷电状态,η C和η D为储能的充电和放电效率限值,S(0)为储能的初始荷电状态限值,S(N t)为储能在调度周期末的荷电状态限值;式(11)-(12)为双向换流器的换流功率及功率波动约束, 和 表示正向换流和负向换流的运行功率限值, 和 表示双向换流器在相邻时段功率波动的下限值和上限值;式(13)-(14)为各时段交直流被切除负荷和可调度负荷的运行功率、交直流可调度负荷用电量约束, 和 是t时段交流和直流最大可切除负荷功率限值, 和 是t时段交流和直流可调度负荷的最大运行功率限值,[t ac,1,t ac,end]为交流可调度负荷的运行时段区间限值,[t dc,1,t dc,end]为直流可调度负荷的运行时段区间限值, 和 是交流和直流可调度负荷的计划用电量限值;式(15)-(16)为直流区和交流区的功率平衡约束, 和 为双向换流器的正向和负向换流 效率限值。
- 根据权利要求5所述的一种交直流混联微网的随机鲁棒耦合型优化调度方法,其特征在于,所述步骤40)的具体内容包括:步骤401):将式(1)-(16)表示的min-max-min形式的随机鲁棒优化调度模型写成以下矩阵表示形式:s.t. Ax≤b,Bx=e,x∈{0,1} (18)Dy s≤f,Ey s=g, (19)Fy s≤h-Gx, (20)Jy s≤w s1,Ky s≤p s2, (21)式中,x为式(2)中第一层的0-1状态变量集合,w s1、p s2、 及 为第二层的随机不确定性集变量集合,y s为第三层的功率变量集合,c和d为该目标函数中的常数矩阵;式(18)表示仅与x相关的约束条件,A、b、B和e均为该约束中的常数矩阵;式(19)表示仅与y s相关的约束条件,D、f、E和g均为该约束中的常数矩阵;式(20)表示与x和y s相关的约束条件,F、h和G均为该约束中的常数矩阵;式(21)表示与w s1、p s2和y s相关的约束条件,J和K均为该约束中的常数矩阵;式(22)表示与 和y s相关的约束条件,M和N均为该约束中的常数矩阵,上标T为矩阵的转置;步骤402):基于步骤401)中矩阵表示形式的模型,利用列约束生成算法形成该随机鲁棒优化调度模型的子问题:式中,α、β、χ、γ、ψ、μ dc和μ ac为式(19)-(22)中y s的对偶变量;步骤403):基于步骤401)中矩阵表示形式的模型和步骤402)的子问题,利用列约束生成算法形成该随机鲁棒优化调度模型的主问题:式中,l为总迭代次数,k为当前迭代次数,n为总随机区间数, 该主问题优化出的x作为已知变量代入子问题, 和 为第k次迭代后子问题中w s1、p s2、 及 的优化结果, 为第k次迭代后子问题中y s的优化结果;η s为与子问题目标函数值相关的优化变量;风机、光伏、直流负荷和交流负荷分别取第s1、s2、s3和s4个偏差区间时对应的场景标记为第s个场景;步骤404):利用整数优化建模工具箱YALMIP调用求解器SCIP迭代求解步骤402)的子问题和步骤403)的主问题,获得交直流混联微网的鲁棒协调运行方式。
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