30 results about "Operating reserve" patented technology

A utility employs an active load management system (ALMS) to estimate available operating reserve for possible dispatch to the utility or another requesting entity (e.g., an independent system operator). According to one embodiment, the ALMS determines amounts of electric power stored in power storage devices, such as electric or hybrid electric vehicles, distributed throughout the utility's service area. The ALMS stores the stored power data in a repository. Responsive to receiving a request for operating reserve, the ALMS determines whether the stored power data alone or in combination with projected energy savings from a control event is sufficient to meet the operating reserve requirement. If so, the ALMS dispatches power from the power storage devices to the power grid to meet the operating reserve need. The need for operating reserve may also be communicated to mobile power storage devices to allow them to provide operating reserve as market conditions require.

A utility employs a method for estimating available operating reserve. Electric power consumption by at least one device serviced by the utility is determined during at least one period of time to produce power consumption data. The power consumption data is stored in a repository. A determination is made that a control event is to occur during which power is to be reduced to one or more devices. Prior to the control event and under an assumption that it is not to occur, power consumption behavior expected of the device(s) is estimated for a time period during which the control event is expected to occur based on the stored power consumption data. Additionally, prior to the control event, projected energy savings resulting from the control event are determined based on the devices' estimated power consumption behavior. An amount of available operating reserve is determined based on the projected energy savings.

A utility employs a method for generating available operating reserve. Electric power consumption by at least one device serviced by the utility is determined during at least one period of time to produce power consumption data, stored in a repository. A determination is made that a control event is to occur during which power is to be reduced to one or more devices. Prior to the control event and under an assumption that it is not to occur, power consumption behavior expected of the device(s) is generated for a time period during which the control event is expected to occur based on the stored power consumption data. Additionally, prior to the control event, projected energy savings resulting from the control event, and associated with a power supply value (PSV) are determined based on the devices' power consumption behavior. An amount of available operating reserve is determined based on the projected energy savings.

A utility employs a method for generating available operating reserve. Electric power consumption device(s) serviced by the utility is determined during period(s) of time to produce power consumption data, stored in a repository. A determination is made that a control event is to occur during which power is to be reduced to one or more devices. Prior to the control event and under an assumption that it is not to occur, power consumption behavior expected of the device(s) is generated for a time period during which the control event is expected to occur based on the stored power consumption data. Additionally, prior to the control event, projected energy savings resulting from the control event, and associated with a power supply value (PSV) are determined based on the devices' power consumption behavior. An amount of available operating reserve is determined based on the projected energy savings.

A utility employs a method for estimating available operating reserve. Electric power consumption by at least one device serviced by the utility is determined during at least one period of time to produce power consumption data, which is stored in a repository. A determination is made that a control event is to occur during which the supply of power is changed to one or more devices. Prior to the control event and under an assumption that it is not to occur, power consumption behavior expected of the device(s) is estimated for a time period during which the control event is expected to occur based on the stored power consumption data. Additionally, prior to the control event, projected energy savings resulting from the control event, and associated with a power supply value (PSV) are determined based on the devices' power consumption behavior. An amount of available operating reserve is determined based on the projected energy savings.

A utility employs a method for generating available operating reserve. Electric power consumption by at least one device serviced by the utility is determined during at least one period of time to produce power consumption data, stored in a repository. A determination is made that a control event is to occur during which power is to be reduced to one or more devices. Prior to the control event and under an assumption that it is not to occur, power consumption behavior expected of the device(s) is generated for a time period during which the control event is expected to occur based on the stored power consumption data. Additionally, prior to the control event, projected energy savings resulting from the control event, and associated with a power supply value (PSV) are determined based on the devices' power consumption behavior. An amount of available operating reserve is determined based on the projected energy savings.

An active load management system (ALMS) is utilized to supply operating reserve to a utility. According to one embodiment, the ALMS determines amounts of power stored in power storage devices located at service points within the utility's service area, and stores the stored power data in a repository. The ALMS also determines an amount of available operating reserve based on at least the stored power data. When the utility needs operating reserve, the ALMS receives a request for operating reserve from the utility. The ALMS then manages a flow of power from the power storage devices to a power grid accessible by the utility responsive to the utility's request, taking into account the amount of available operating reserve. Determination of stored power data may be aided by reports received from control devices located at the service points, where the reports indicate amounts of power stored by the power storage devices.

A method of controlling a power system includes monitoring a load on an electrical grid, monitoring a power generation from one or more power producers connected to the electrical grid, wherein at least one of the one or more power producers is a power plant including a carbon dioxide capture system, and utilizing the carbon dioxide capture system of the one or more power producers as a operating reserve in response to an increase in the load on the electrical grid or a reduction in the power generation from one or more power producers connected to the electrical grid.

The invention discloses a power system operating reserve optimization method taking a risk and wind power generator into consideration. According to the method, the optimal configuration problem of a power system reserve capacity is taken into consideration by combining a probability and a result in the risk. A purpose of optimizing the integrated operating benefit of a power system containing wind power generation is taken as a target function, and a distribution scheme for the power system reserve is resolved through combination of a power balance equation taking wind power contribution into consideration, a generator output power constraint, a reserve climbing rate constraint, a load reserve demand quantity constraint taking wind power contribution fluctuation into consideration, a transmission line power constraint taking the wind power contribution fluctuation into consideration and a high power tie line N-1 fault constraint taking the risk into consideration. According to the method, the wind power generation contribution uncertainty and reserve support problem after a fault are taken into full consideration, the integrated risk of the power system is minimized, the optimal configuration of resources is realized well, and certain reference value for power grid planning and operation is achieved.

In order to relieve the operator of a combing machine from having to handle the heavy comb reels (4, 7), a mechanically operated reserve reel trough (6) is provided. It can be lowered to such a level that it can easily roll comb reels, even from the lowest position into which they are delivered by the combing machine, into the reserve reel trough. On the other hand it can be raised to such a high level that the reserve reels roll by themselves into working position on the reel cylinders (2, 3). The mechanical operation is effected preferably by a fluidically (pneumatic or hydraulic) operable work element with cylinder and piston which is arranged between the frame of the combing machine and the reserve reel trough.

The application discloses a security constrained economic dispatching method, system, device and computer readable storage medium, with the goal of realizing reserve requirements for dynamic operation. After considering the operating reserve price of a power generator set and the objective function and constraint conditions of the operating reserve plan. The security constrained economic dispatching method comprises the following steps: calculating the output plan and operating reserve plan of the set through substituting the operational reserve requirement of given power grid into the objective function and the constraint conditions; obtaining the operational reserve requirement of the current power grid using the operational reserve plan; deciding whether the coefficient of convergenceis met by comparing the operational reserve requirements of current power grid to the previous operational reserve requirements of current power grid, and if the coefficient of convergence is not met,substituting the operational reserve requirements of current power grid into the objective function and the constraint conditions again to obtain the next operational reserve requirements of the power grid and performing repeated iteration until the coefficient of convergence is met; outputting the operational reserve requirement of current power grid and the output plan of the set; the securityconstrained economic dispatching method reduces operating reserve level of the system and improves electric energy availability of the power generator set and running benefit of the power grid.

The method comprises the following steps: S1. planning and designing the upper layer problem: the upper layer objective function is formula (1), and the master plan and operation cost are converted into function value according to factor gamma; S2. lower-level problems in planning and designing: the lower-level problems represent the goal of the power supply organization, that is, to maximize thereserve capacity provided by the micro-grid to support the operation of the power system. In the context of microgrid applications, the present invention proposes a two-layer model method to minimizecoupling design and operating costs. In the method, the non-collinear bi-level power and reserve planning formulas for power supply and microgrid are proposed. The power supply can request reserve capacity from the microgrid planner, which is designed to minimize the planning and operating costs of the microgrid planner. The proposed model can also better represent the possible conflicts between the micro-grid planner and the power supply.

Example implementations described herein are directed to managing the operation of a plurality of electric vehicles (EVs) for transportation service, power system operating reserve service and operation planning, which is utilized to determine whether to use each EV for transportation travel or power system operating reserve supply for a given time period and location. Such management allows for the increase of the total operation value by transportation travel and power system operation reserve supply.

The invention discloses a wind farm dispatching method and system based on a virtual power source, which can minimize the loss of wind turbines in the wind farm, effectively improve the ability to absorb wind power and reduce the operating cost of the wind farm. The method includes: dividing the wind turbines of the operation type and the dispatching type; respectively equating the wind turbines of the operation type and the dispatching type into the operation virtual power supply and the dispatching virtual power supply, respectively establishing the dispatching models of the operation virtual power supply and the dispatching virtual power supply; The operating cost of the wind farm, the operating reserve cost, the penalty cost of wind abandonment, and the damage of the wind turbines in the wind farm are used to construct the objective function of the optimal dispatching model of the wind farm; Under the constraint of reserve capacity, solve the objective function of the optimal dispatching model of the wind farm to obtain the optimal dispatching model of the wind farm; receive the grid dispatching instruction, and set the output power of the wind turbines in the wind farm according to the optimal dispatching model of the wind farm.

Disclosed is an online evaluation method of a safety margin of an operating reserve in a power system, which belongs to the technical field of power system operation and control. A post-fault steady operation state of the system is obtained by considering protection and through time-domain simulation of action of an automatic safety device, and active power sensitivity of the operating reserve for power transmission equipment and a power transmission corridor is calculated based on a direct-current (DC) power flow equation of the state. A maximum capacity of the operating reserve that is useful for actual control of a steady state frequency is obtained by solving an optimization function considering a controllable interval of the operating reserve, an overload limit of the power transmission equipment and a safety and stability limit of the power transmission corridor, and aiming at maximizing the operating reserve. A maximum controllable quantity of the steady state frequency is calculated in combination with power and frequency static characteristic coefficients, achieving online evaluation of a safety margin of the operating reserve taking faults into consideration.

The present application discloses a method, system, device and computer-readable storage medium for security-constrained economic scheduling, and establishes an objective function and constraint conditions aiming at realizing dynamic operation reserve demand and considering the operation reserve price and operation reserve plan of generating units , by substituting the given power grid operation reserve demand into the objective function and constraints, calculate the unit output plan and the operation reserve plan, and then use the operation reserve plan to obtain the current power grid operation reserve demand, and compare the current power grid operation reserve demand with the last current power grid Run the backup demand to judge whether the convergence coefficient is met. If not, resubstitute the current power grid operation backup demand into the objective function and constraint conditions to obtain the next power grid operation backup demand, repeat iterations until the convergence coefficient is satisfied, and output the current power grid operation The backup demand and unit output plan reduce the system operation backup level, improve the power availability of the generator set and the operation efficiency of the power grid.

The invention discloses a multi-state power system dispatching method considering the constraints of reliability and wind cutting rate. Establish a multi-state model of load demand, a multi-state model of wind turbine output and a multi-state model of generator failure, and build a multi-state model of the power system; according to the multi-state model of the power system, under the overall state of each power system, combine The probability of the state is processed to obtain the expected load shedding value and expected wind cutting value; the unit combination model that takes into account the constraints of expected load loss parameters and expected wind cutting parameters is used for the power system under the premise of satisfying system reliability and wind cutting rate. Carry out optimal scheduling, calculate the active power output and operating reserve allocation value of the generator set in each time period of the future, and then schedule the power system. The invention can accurately schedule the output and operation backup of each generator set in the electric power system, and ensure that the system meets the requirements of reliability and wind cutting rate.

An arrangement comprising a regenerative energy generator and a store for electrical energy to be output to a grid, the regenerative energy generator including an energy converter for converting renewable energy sources into electrical energy and a power control unit which has an input for a target power output and controls the power generation by the regenerative energy converter, with a charge controller for the store also being provided, which sets a minimum operating reserve and outputs a signal for a target state of charge (SoC) of the store. In order to achieve improved utilization of the store, a correction unit is connected to the charge controller and continuously modifies the signal for the target state of charge (SoC). A sequence control unit is actuated by the correction unit and influences the power control unit of the regenerative energy generator according to an output value of the correction unit.

Example implementations described herein are directed to managing the operation of a plurality of electric vehicles (EVs) for transportation service, power system operating reserve service (ORS) and operation planning, which is utilized to determine whether to use each EV 100 for transportation travel or power system operating reserve supply for a given time period and location. Such management allows for the increase of the total operation value by transportation travel and power system operation reserve supply.

A method for optimal planning of microgrid power and operating reserve capacity, said method comprising the following steps: S1. Planning and design upper-level issues: the upper-level objective function is formula (1), and the total plan and operating costs are converted into function values ​​by factor γ ; S2. Planning and Design Lower Level Problem: The lower level problem represents the goal of the power supply organization, which is to maximize the reserve capacity provided by the microgrid to support the operation of the power system. In the context of microgrid applications, the present invention proposes a two-tier model approach to minimize coupling design and operating costs. In the method, a non-collinear two-layer power and storage planning formula for the power supply organization and the microgrid is proposed, and the power supply organization can request backup capacity from the microgrid planner, which aims to minimize its planning and operating costs. The proposed model can also better represent potentially conflicting relationships between microgrid planners and power supply agencies.

The invention discloses a power system operating reserve optimization method taking a risk and wind power generator into consideration. According to the method, the optimal configuration problem of a power system reserve capacity is taken into consideration by combining a probability and a result in the risk. A purpose of optimizing the integrated operating benefit of a power system containing wind power generation is taken as a target function, and a distribution scheme for the power system reserve is resolved through combination of a power balance equation taking wind power contribution into consideration, a generator output power constraint, a reserve climbing rate constraint, a load reserve demand quantity constraint taking wind power contribution fluctuation into consideration, a transmission line power constraint taking the wind power contribution fluctuation into consideration and a high power tie line N-1 fault constraint taking the risk into consideration. According to the method, the wind power generation contribution uncertainty and reserve support problem after a fault are taken into full consideration, the integrated risk of the power system is minimized, the optimal configuration of resources is realized well, and certain reference value for power grid planning and operation is achieved.

Disclosed is a method for rapidly and flexibly adapting the output of a steam-turbine power station (1), preferably for adapting the output to altered network loads, more preferably for providing a positive and / or negative network operating reserve as required, and especially preferably for providing a primary operating reserve and / or a secondary operating reserve. According to the invention, heat released during the discharge of at least one electrically chargeable thermal store (6) is coupled into a feedwater heater section (3) of the power station (1).