30results about How to "Reduce curtailment" patented technology

The invention discloses a real-time power generation plan optimization method considering northern Shaanxi cascade section limit linkage adjustment. The method comprises the following steps: based onvarious basic data of a real-time power generation plan, constructing a network-province two-stage real-time power generation plan coordination optimization model in a generalized tie line mode, and providing a unit initial plan value and a section initial tide value for joint optimization of the real-time power generation plan and Shaanbei cascade section limit. According to the method, based onvarious basic data of a real-time power generation plan, a unit initial plan and a section initial tidal current value, a real-time power generation plan optimization model considering northern Shaanxi cascade section limit linkage adjustment is constructed; an optimization target is introduced into the Shaanbei virtual subarea, so that the new energy wind curtailment amount is minimum; constraints such as a Shaanbei subarea cascade section and a the central Shaanxi plain subarea admitting ability are introduced into constraint conditions, combined optimization of unit output and stable section limits is achieved, the Shaanbei subarea new energy consumption potential of Shaanxi province is fully excavated, the utilization rate of the Shaanbei cascade section is increased, and the lean level of northwest regional power grid new energy scheduling is improved.

The invention relates to a photovoltaic energy storage system in a DC power distribution network and an operation control method thereof, and belongs to the technical field of power electronics. The system comprises the DC power distribution network, a photovoltaic power station module, a limited energy storage module, a grid connection module and a main control module. The grid connection module enables the photovoltaic power station module and the energy storage module, which are connected to a low-voltage DC bus, to be connected to a medium-voltage DC bus in the DC power distribution network; and the grid connection module comprises a DC solid-state transformer and a third DC circuit breaker. The main control module is used for finishing general communication control, maximum power point tracking MPPT of the photovoltaic power station module, charge and discharge control of the energy storage module, control of the grid connection module and on-off control of a photovoltaic energy storage system in the DC power distribution network. Through the system and the specific method, the problem of grid connection of a small / middle-power-level photovoltaic grid-connected power generation system is solved, photovoltaic utilization rate is improved, and the phenomenon of "photovoltaic power abandonment" is reduced.

The invention relates to an energy enrichment power grid power supply planning method and system. The method comprises first-stage planning processing and second-stage planning processing. The first-stage planning processing is characterized by based on a planning grid structure, taking the maximum line or section power flow as an optimization target, satisfying the voltage and frequency operationconstraint conditions, carrying out N1 and N2 stability check on network elements, and forming a power supply planning scheme meeting the safety and stability requirements of a power system; and thesecond-stage planning processing is characterized by on the basis that the first-stage power supply planning is feasible, establishing equivalent substitution relationships of various power supplies to optimize the configuration positions and the configuration number of different types of power supplies in the power supply layout planning, and then taking the minimum operation cost as an objectivefunction for the selected power supply layout planning scheme, and taking the resource constraints, the load requirements, the unit output characteristics and the operation cost characteristics as boundary constraints to analyze the new energy consumption level of an electric power and electric quantity balancing machine to thereby form an optimal layout scheme.

The invention provides a source-network-load integrated economic dispatching method and system considering demand response, and the method comprises the steps: building a source-network-load integrated economic dispatching optimization model considering the demand response and the adjustment of a power grid topological structure, enabling the optimization model to take the minimum sum of power generation cost, demand response cost and wind curtailment cost as a target, converting the mixed integer nonlinear constraint condition in the optimization model into an equivalent mixed integer linearconstraint condition, and solving the converted mixed integer linear programming model by adopting a mixed integer linear programming method to obtain a final source-network-load integrated economic dispatching scheme. The method can be used for power system economic dispatching under large-scale wind power grid connection, the power transmission side power grid structure and the power utilizationside load power utilization demand are regarded as flexible resources capable of participating in dispatching to be integrated into a power generation dispatching plan, global optimal configuration of source network load resources is achieved, the wind power waste amount can be reduced, and the economical efficiency of system operation is improved.

The invention provides a system for generating hydrogen through a high-temperature solid electrolytic tank by means of thermal power plant peak load regulation electricity. The system for generating the hydrogen through the high-temperature solid electrolytic tank by means of the thermal power plant peak load regulation electricity comprises a power grid peak load regulation control system, a power transmission and distribution and electrolytic tank power supply system, a high-temperature solid electrolytic tank hydrogen generating system, an electrolytic tank high-temperature steam supplying system and a hydrogen collecting, purifying and outward transmission system. The power transmission and distribution and electrolytic tank power supply system is a newly added interval on an outgoing bus of a power plant. An electric switch is arranged on the interval. The electric switch is connected with a step-down transformer and an inverter on a power transmission network. The other end of the step-down transformer and the other end of the inverter are connected with the high-temperature solid electrolytic tank hydrogen generating system. In the electrolytic tank high-temperature steam supplying system, a power plant main steam bypass guides out high-temperature steam, and the high-temperature steam is supplied to the electrolytic tank. By the adoption of the system for generating the hydrogen through the high-temperature solid electrolytic tank by means of the thermal power plant peak load regulation electricity, electrolysis hydrogen generation is conducted through the thermal power plant peak load regulation electricity, the main steam of the power plant is guided out, electrically overheated and then conveyed into the electrolytic tank, the hydrogen generation efficiency of the solid electrolytic tank is improved, the peak load regulation electricity of the power plant is greatly utilized, and a valuable peak load regulation load is provided for the power plant.

The invention relates to a medium- and long-term implicit random scheduling method for a cascade hydropower station combined with a wind power photovoltaic power station, and belongs to the technical field of hybrid energy system scheduling. The method considers the uncertainty of monthly runoff, and uses the radial basis neural network to fit the scheduling model through the implicit random scheduling method. The model of the present invention reasonably considers the uncertainty of wind power and photovoltaics and the impact of the reverse peak regulation phenomenon on the power grid, and considers the short-term wind and wind uncertainty in the medium and long-term dispatching to reserve sufficient reserves, and allocates enough daily electricity to deal with reverse regulation The pressure brought by the peak phenomenon to the peak regulation of the power grid. The model results of the present invention are very different from the results when short-term backup of wind power and photovoltaic power is not considered. The present invention can effectively utilize wind power photovoltaic output and cascade hydropower station optimization scheduling information, and provide scientific decision-making for cascade hydropower stations under the condition of large-scale new energy grid connection. An operable reference basis.

The invention discloses a method for calculating the maximum transmission capacity of a transmission line of a wind farm, which includes acquiring historical data of an area to be analyzed; calculating the average temperature of the highest daily temperature in a historical month in the area to be analyzed; and calculating a temperature correction coefficient of the area to be analyzed; Obtain the maximum transmission capacity of the wind farm outgoing line in each month in the area to be analyzed. When the present invention calculates the transmission capacity of each month sent out by the wind farm, the maximum temperature of each month and the simultaneous rate of the wind farm can be considered comprehensively, and the limit value for the transmission capacity of the wind farm sent out by each month can be obtained, which can meet the actual engineering needs; and comprehensively Considering the maximum transmission capacity of the transmission line of the wind farm in different months, the maximum output power of the wind farm can be sent out, effectively reducing the power waste of the wind farm, which is conducive to the safe and stable operation of the power grid and the improvement of the power transmission efficiency of the transmission line; therefore, the method of the present invention is more efficient. It conforms to the actual operation status of the current wind farm, and has high reliability and good scientificity.

The present invention provides a source-grid-load integrated economic scheduling method and system considering demand response, constructs a source-grid-load integrated economic dispatch optimization model considering demand response and grid topology adjustment, and optimizes the model based on power generation cost and demand response cost The goal is to minimize the total cost of abandoning wind power; convert the mixed integer nonlinear constraints in the optimization model into equivalent mixed integer linear constraints, and use the mixed integer linear programming method to solve the converted mixed integer linear programming model, and get The final integrated economic dispatching scheme of source, network and load. The invention can be used for the economic dispatch of the power system under large-scale wind power grid-connected, and considers the power grid structure on the transmission side and the load demand on the power consumption side as flexible resources that can participate in the dispatch and integrates them into the power generation dispatch plan to realize the overall situation of source, network and load resources Optimal configuration can reduce wind power curtailment and improve the economy of system operation.

The invention relates to a photovoltaic energy storage system in a DC power distribution network and an operation control method thereof, and belongs to the technical field of power electronics. The system comprises the DC power distribution network, a photovoltaic power station module, a limited energy storage module, a grid connection module and a main control module. The grid connection module enables the photovoltaic power station module and the energy storage module, which are connected to a low-voltage DC bus, to be connected to a medium-voltage DC bus in the DC power distribution network; and the grid connection module comprises a DC solid-state transformer and a third DC circuit breaker. The main control module is used for finishing general communication control, maximum power point tracking MPPT of the photovoltaic power station module, charge and discharge control of the energy storage module, control of the grid connection module and on-off control of a photovoltaic energy storage system in the DC power distribution network. Through the system and the specific method, the problem of grid connection of a small / middle-power-level photovoltaic grid-connected power generation system is solved, photovoltaic utilization rate is improved, and the phenomenon of "photovoltaic power abandonment" is reduced.

The invention discloses a real-time power generation plan optimization method considering the linkage adjustment of the cascade section limit in northern Shaanxi, which includes: based on various basic data of the real-time power generation plan, constructing a two-level real-time power generation plan coordination optimization model of the grid and province under the generalized tie line mode, for The joint optimization of real-time power generation plan and northern Shaanxi cascade section quota provides unit initial plan value and section initial tidal current value; based on various basic data of real-time power generation plan, unit initial plan and section initial tidal current value, constructs the cascade section quota linkage in consideration of northern Shaanxi The adjusted real-time power generation plan optimization model, the optimization goal is introduced into the northern Shaanxi virtual zone to minimize the amount of new energy abandoned air, and the constraints are introduced into the cascading sections of the northern Shaanxi zone and the acceptance capacity of the Guanzhong zone to realize the joint optimization of unit output and stable section quotas, fully The potential of new energy consumption in the northern part of Shaanxi Province has been tapped, the utilization rate of cascade sections in northern Shaanxi has been improved, and the lean level of new energy dispatching in the northwest regional power grid has been improved.

The invention puts forward a photothermal power station with electric heating devices and a modeling and operation optimization method of the photothermal power station. A model is applicable to the independent operation photothermal power station, a multi-energy complementary system with wind power, photovoltaic and photothermal power generation functions and other scenes, and multiple operationconstraints are considered and comprise a thermal power balance constraint with hot salt tanks as nodes, a thermoelectric conversion relation constraint of the electric heating devices, a heat tank hourly heat accumulation state constraint, a constraint that stored heat is equal to released heat in a calculation cycle, a thermoelectric conversion constraint of a turbonator, a starting heat constraint and an electric power balance constraint of a steam turbine, a wind curtailment and photoelectric power constraint used for the electric heating devices, and other constraints. The mixed integer linear optimization technology is adopted to solve the optimization problem. By additionally installing an appropriate amount of electric heating devices in the photothermal power station, the electricquantity curtailment of new energy can be effectively reduced, the photothermal electric energy production is increased, and the operation economy of the photothermal power station and the multi-energy complementary system is improved.

The invention belongs to the field of power system dispatching, and provides a method for quantifying the flexibility demand of a wind-solar-water multi-energy complementary system and a coordinated optimization method. First, a method for quantifying the demand for flexibility considering the uncertainty of wind-solar output is constructed, and quantile points are used to quantify the wind-solar output interval. Divide and generate output scenario sets, and then calculate the flexibility requirements in each scenario; based on the quantitative indicators of flexibility requirements, build a water-solar hybrid optimization scheduling model that considers the lack of system flexibility with the smallest expectation, so as to realize the optimal calculation of water-solar hybrid. Relying on the actual wind-solar-water complementary system of Yunnan Power Grid, model verification is carried out for different new energy access ratios. The results show that the method of the present invention can provide multi-type power supply complementary operation scheduling schemes under different conditions, effectively meet the flexibility requirements of the system, reduce Abandon electricity and improve the consumption level of clean energy.

The invention provides a grid-connected power control strategy of an electric energy router for rail transit power distribution, and the method comprises the steps: firstly solving target smooth power under the maximum wind and light output according to a rear end point power smooth semi-compensation algorithm, and then solving an output power instruction corresponding to a wind and light distributed power supply; and finally, controlling the wind-solar distributed power supply to track the instruction power and stably outputting the instruction power, so that the grid-connected point power is smooth and fluctuation is reduced. According to the method, the back end point power smoothing semi-compensation algorithm with the sliding window length of 7 is adopted twice to smooth the grid-connected point power, after the algorithm is continuously applied twice, grid-connected point power smoothing can be well achieved, meanwhile, the distributed power supply can be fully utilized as much as possible, and the abandoned power quantity is reduced.

The invention discloses a risk control-based new energy incorporation power system standby method and device, and the method comprises the steps: carrying out the discretization of a new energy incorporation standby proportion, and screening out a group of new energy incorporation standby proportions meeting a system loss load risk; and finding out the optimal solution from the group of solutionsby taking the minimum new energy power abandoning rate of the system as the target, and therefore, the inclusion mode can meet the system loss load risk control requirement and the target of the minimum new energy power abandoning rate at the same time. According to the method, new energy is brought into reserve in a certain mode, the starting mode of a conventional thermal power generating unit can be reduced, and therefore the maximum new energy consumption space of the system is increased, new energy abandoned electricity is reduced, and the new energy generating capacity in a power grid isimproved.

The invention discloses a method for optimizing a hydropower cluster sending network structure considering the utilization rate of clean energy, calculates the degree of membership of each scheme corresponding to the evaluation set to which it belongs, and determines the ranking of alternative schemes. S17: Select the current optimal hydropower cluster sending scheme. S18: Does the system meet the security and stability constraints? S19: Can it pass the serious fault check? 20: Is the channel constraint satisfied? S21: Delete the current solution in the candidate library. S22: Are there alternatives in the alternative library? S23: Can the development scale and commissioning sequence of hydropower clusters be optimized? S24: Under constrained boundary conditions, optimize the development scale and commissioning sequence of hydropower clusters. S25: Optimize partition balance and change power flow direction. S26: Analyze and calculate the clean energy utilization rate of each planning level year; S27: Determine whether the clean energy utilization rate constraint is satisfied? S28: Form a hydropower cluster transmission scheme; S29: Obtain an optimization scheme for the hydropower cluster transmission network structure based on the existing grid channels.

The invention discloses a method for improving the energy utilization rate of a multi-energy system containing a hydrogen storage device, which belongs to the field of electric power system and multi-energy technology. The energy storage and heat source are modeled; then the energy power balance model of the multi-energy system is established through the energy coupling relationship between the multi-energy sources, and the energy utilization power optimization model of the multi-energy system is established according to the stable operation constraints of the hydrogen storage equipment; finally, the The multi-objective differential evolution algorithm solves the energy utilization power optimization model of the multi-energy system, obtains the energy utilization of the multi-energy system in a year according to the typical daily multi-energy utilization, and obtains the energy utilization ratio of the hydrogen storage device in the multi-energy system. The present invention uses the hydrogen storage device to judge the efficiency of energy utilization improvement in the operation of the multi-energy system, and highlights the criticality of the hydrogen storage device for improving the energy utilization rate of the multi-energy system.