60 results about "Power-flow study" patented technology

A system and methods that enables power flow management using AGC commands to control power resources. Power regulation can be apportioned to the power resources. An AGC command requesting an apportioned amount of the power regulation may be transmitted to a power resource. The power flow manager can determine a power regulation range for a power resource, and transmit an AGC command based on the power regulation range. In addition, a power flow management system can detect a change in an intermittent power flow and implement a power flow strategy in response to the change in the intermittent power flow. The power flow strategy may be a smoothing strategy or a leveling strategy.

A wind energy installation includes a tower provided with rotor blades that are adjusted using a servomotor connected to a pitch circuit and an emergency circuit. During normal operation the rotor blades are actuated by the pitch circuit and during emergency operation are actuated by the emergency circuit. The emergency circuit has an electric energy store, a switching device, connection lines to the servomotor and a protection device which includes comprises a power flow detector module (60) designed for determining whether electric power flows into or from the servomotor and a discharge module designed to limit the voltage and / or current in the emergency circuit in the case of a power flow from the servomotor.

A power flow control system for an interconnected power system, the interconnected power system comprising a plurality of electrical subsystems; an abstract framework configured to work as a utility maximiser under constraints (that applies to the electrical subsystems by specifying their capabilities, expected behavior and a simplified view of their internal state);and a plurality of agents. Each agent is responsible of one or a plurality of the electrical subsystems, comprises means configured to express an internal state of the electrical subsystem within a common system of coordinates, and has communication means configured to communicate among agents according to a protocol. The abstract framework means enables a composition of a set of the interconnected electrical subsystems into a further subsystem for which a further internal state is expressed within the same common system of coordinates used before, the further internal state being communicated with other agents according to the protocol.

The electrical power transmission apparatus is electrically connected to an electrical main and a fee collecting device. The electrical power transmission apparatus includes a transmission unit that includes a first output port and a second output port; an electrical power flow detector is electrically connected to the electric main; a conversion unit includes a first converter and a second converter that effect conversion of electrical power, the first and second converters are respectively and electrically connected between the first and second output ports and the electrical power flow detector, and the first and second output ports respectively supply alternate-current (AC) power and direct-current (DC) power through the conversion effected by the first and second converters; and a processing unit is electrically connected between the electrical power flow detector and the fee collecting device and is further electrically connected to the conversion unit to control selection of the electrical power to be transmitted to AC power or DC power. The processing unit receives a detection result of the electrical power flow detected by the electrical power flow detector for generating a related amount of fee with which the fee collecting device carries out a fee collecting operation.

The present invention provides an industrial park microgrid electric heating integrated scheduling method based on distributed cleaning heating. The method comprises the steps of: establishing an industrial park microgrid whole frame based on distributed heating, wherein the whole frame comprises a building electric heating supply system and an industrial park cooperative power supply system; constructing an industrial park microgrid simulation model, wherein the industrial park microgrid simulation model a building heat balance model, an air source heat pump model and a heat storage device model; constructing an industrial park microgrid day-ahead economic scheduling model, wherein the industrial park microgrid day-ahead economic scheduling model comprises a target function, an electric power balance constraint condition, an indoor temperature constraint condition, an air source heat pump heat power constraint condition, an energy storage capacity constraint condition, an energy storage device power constraint condition, a photovoltaic network power constraint condition and a power flow constraint condition; and providing a microgrid scheduling solution method based on the geneticalgorithm, wherein the microgrid scheduling solution method comprises individual screening and modification and optimizing of part of the genetic algorithm. The industrial park microgrid electric heating integrated scheduling method based on distributed cleaning heating can provide a technical support for scheduling of an industrial park by taking distributed cleaning heating as a core to facilitate improvement of the energy integral utilization and the management level and prompt the reasonable development of an industrial park micro energy grid.

The invention discloses a power distribution network voltage regulation method based on an internet cloud platform and distributed energy storage. The distributed energy storage accesses to the cloudplatform through the internet, and sends an energy storage state and other data to the cloud platform; the cloud platform monitors power distribution network flow in real time, when a voltage peak ofa node in the power distribution network deviates from the normal range, the internet platform performs optimal computation on the power flow through a voltage sorting search method, determines the optimal distributed energy storage charging / discharging policy, and then sends the charging / discharging instruction to the distributed energy storage unit. The voltage is regulated to the normal range by using the charging / discharging of the distributed energy storage, and the safe and stable running of the power distribution network is maintained.

The invention discloses a GPU accelerated power flow jacobian matrix LU decomposition method. The method includes the steps that LU symbol decomposition is carried out on a jacobian matrix J in a CPU to obtain sparse structures of a lower triangle transformation matrix L and an upper triangle matrix U, and the sparse structure of J is equal to L+U after symbol decomposition; according to the sparse structure of the matrix U, all columns of the matrix J are layered in a parallelization mode, and data needed by calculation is transmitted to a GPU; a layered LU decomposition kernel function Sparse LU is calculated in the GPU in the sequence of level progressive increase. The mode of combining program process controlling and basic data processing through the CPU with dense floating-point calculation processing through the GPU is used for improving the efficiency of power flow jacobian matrix LU decomposition, and the problem that flow calculation consumes time greatly in electric system static safety analysis is solved.

A wind energy installation includes a tower provided with rotor blades that are adjusted using a servomotor connected to a pitch circuit and an emergency circuit. During normal operation the rotor blades are actuated by the pitch circuit and during emergency operation are actuated by the emergency circuit. The emergency circuit has an electric energy store, a switching device, connection lines to the servomotor and a protection device which includes comprises a power flow detector module (60) designed for determining whether electric power flows into or from the servomotor and a discharge module designed to limit the voltage and / or current in the emergency circuit in the case of a power flow from the servomotor.

The invention discloses a QR decomposition method of a power flow Jacobian matrix for GPU acceleration. The QR decomposition method comprises the steps of carrying out QR symbol decomposition on a Jacobian matrix J in a CPU so as to acquire a Household transformation matrix V and a sparse structure of an upper triangular matrix R; carrying out parallelized layering on each column of the matrix J according to the sparse structure of the matrix R; and calculating a sub-layer QR decomposition kernel function SparseQR according to a level increasing order in a GPU. According to the invention, the efficiency of QR decomposition of the power flow Jacobian matrix is improved by using a mode of combining the process of a CPU control program for processing basic data and the GPU for processing intensive floating-point calculation, and a problem great time consumption of flow calculation in power system steady-state security analysis is solved.

The invention provides a charging and discharging optimization control method for an electric automobile group. The method comprises the following steps of acquiring next-day charging and dischargingtime period data of each automobile participating in charging and discharging; discretizing next-day time into a plurality of time slots and generating a time slot set according to the next-day charging and discharging time period data of all the automobiles; acquiring electric power flow data and sensitivity data of each time slot in the time slot set; calculating the charging and discharging power of each automobile in each time slot by means of an internal point approach according to the sensitivity data. By means of the charging and discharging optimization control method, voltage fluctuation is reduced, peak-to-valley differences of loads are reduced, the losses of a power distribution network are decreased, and economic benefits of users of the electric automobiles are increased.

The invention discloses a power system fault monitoring method. The power system fault monitoring method comprises the steps of generating a power flow network structure through an electric system, calculating the operating parameters of the electric system, simulating the electric system according to the calculated operating parameters, and monitoring the fault of a microcomputer protection device in the electric system according to the simulation result. In addition, the invention discloses a power system fault monitoring system. According to the power system fault monitoring method, the real-time power flow network structure is generated through modeling of the electric system, simulating monitoring physical quantity of the actual electric system is obtained through simulation model calculation, electric monitoring quantity is directly input into a comprehensive protection device to simulate the on-site running condition of the electric system, and therefore on-line monitoring and examining of the power system fault can be achieved efficiently and accurately.

The present invention is concerned with the computation of power system sensitivities from power flow parameters and control parameters of a Power Flow Control Device (PFC). To this end, control parameter variations are applied to or generated by a PFC (20), and comprise variations in a control input u, a control effort e (injected series voltage, inserted series reactance), or a control effect q (power flow, active power transfer, phase-shift, current). A power flow response measuring unit (40) measures a variation of a power flow response such as current, active or apparent power, in a way sufficiently synchronized with the control parameter variation to allow establishing an unambiguous causal relationship or correspondence in the form of a power system sensitivity. The latter may be on-line adapted to continuously reflect an updated aspect of the power system behaviour, and thus enable an improved, fast and reliable power flow control in power systems comprising a meshed power network with two parallel flow paths or corridors connecting two areas or sub-systems.

A power supply and demand control apparatus includes a power generation planning unit that calculates one day's power outputs of multiple distributed power sources and a power flow target of a linking point to another power system, a long-cycle control unit having a long-cycle supply-demand balancing control unit that performs control every few minutes so as to ensure the supply-demand balancing of electric energy in a given amount of time at the linking point in order to perform control for making deviations between total power output calculated by the power generation planning unit and load power in the power system constant, and a short-cycle control unit having a short-cycle supply-demand balancing control unit that performs similar control every few seconds. In the power supply and demand control apparatus, the long-cycle control unit and short-cycle control unit perform the supply-demand balancing control in a hierarchical fashion to determine output assignments of the distributed power sources.

A power flow control system for an interconnected power system, the interconnected power system comprising a plurality of electrical subsystems; an abstract framework configured to work as a utility maximizer under constraints (that applies to the electrical subsystems by specifying their capabilities, expected behavior and a simplified view of their internal state); and a plurality of agents. Each agent is responsible of one or a plurality of the electrical subsystems, comprises means configured to express an internal state of the electrical subsystem within a common system of coordinates, and has communication means configured to communicate among agents according to a protocol. The abstract framework means enables a composition of a set of the interconnected electrical subsystems into a further subsystem for which a further internal state is expressed within the same common system of coordinates used before, the further internal state being communicated with other agents according to the protocol.

The invention provides a charging and discharging optimal control method of an electric car group. The method comprises the steps that charging and discharging time period data in a next day of each car participating in charging and discharging is obtained; the time in the next day is dispersed into a plurality of time slots, and a time slot set is generated according to the charging and discharging time period data in next day of all cars; power flow data and sensitivity data of each time slot in the time slot set are obtained; and the charging and discharging power of each car in each time slot is calculated by adopting an interior point method according to the sensitivity data. The charging and discharging optimal control method relieves the voltage fluctuations, lowers the load peak and off-peak difference, reduces the distribution network energy loss, and increases the economical benefits of electric car users.

A new approach in contingency analysis is presented based on a modular method for power flow calculation. The proposed method exploits reuse of power flow data for modules not affected by an outage. The method minimizes the number of necessary computations and matrix inversions in contingency analysis; this is achieved by recalculating only the modules affected by the change and reusing data from the original system for all other modules.