103 results about "Distributed power control" patented technology

An embodiment method for power control in a multi-hop communications system includes transmitting a power usage pattern for each relay node in a subset of relay nodes served by a communications controller, where the power usage pattern specifies transmit power levels for the relay node while the relay node is operating in a power control mode. The method also includes receiving channel measurements of access links between the relay nodes in the subset of relay nodes and subscriber equipment served by the relay nodes, determining backhaul link transmit power levels and access link transmit power levels based on the channel measurements of access links and channel measurements of backhaul links between the communications controller and the relay nodes, and transmitting the access link power levels to the subset of relay nodes.

The invention relates to a distributed energy management method and device. The distributed energy management device is composed of a ground layer, an intermediate layer and an energy management layer. The ground layer comprises a distributed power controller, an energy storage controller, a load controller, an invertor, a converter and a breaker. The intermediate layer comprises a data communication module, an operation control module, an energy storage management module and a load management module. The energy management layer comprises a data communication and monitoring module, an economic dispatch and optimal operation module, a load prediction module and a power generation prediction module. The ground layer and the intermediate layer coordinate and control short-term power in a local micro-grid system to be stable; the energy management layer coordinates and controls long-term power in the micro-grid system where the energy management layer belongs to be stable, and economization of micro-grid operation is achieved; meanwhile, the distributed energy management device is clear in structure, functions are specific, and system upgrade and function extension are facilitated.

In an example embodiment, a distributed power control system can include a datacenter and a remote master control system. The datacenter can include (i) computing systems, (ii) a behind-the-meter power input system configured to receive power from a behind-the-meter power source and deliver power to the computing systems, and (iii) a datacenter control system configured to control the computing systems and the behind-the-meter power input system. The remote master control system can be configured to issue instructions to the datacenter that affect an amount of behind-the-meter power consumed by the datacenter. The datacenter control system can receive, from a local station control system configured to at least partially control the behind-the-meter power source, a directive for the datacenter to ramp-down power consumption, and in response to receiving the directive, cause the computing systems to perform a set of predetermined operations correlated with the directive.

The invention relates to a method and a system for restoring power after fault of a power distribution network containing DGs. According to the method, the DGs integrated in the power distribution network are processed in a classified manner according to the control method of the DGs and are divided into main power supplies and ordinary power supplies, wherein the main power supplies are controllable DGs, and the ordinary power supplies are random and uncontrollable DGs; and meanwhile, a standby contact wire is used as a main power supply, then, a multi-agent system for power restoration after fault of the power distribution network containing the DGs is established, and the optimum power supply scheme of a power-losing area is planned in a master-slave control mode. Compared with the prior art, the standby contact wire and the DGs integrated in the power distribution network are fully utilized in the restoration process, the power outage load is restored to the maximum, and the isolated island operation capacity of the DGs and randomness and volatility of output power are given full consideration, so that a restoration scheme can continuously and stably operate.

A method to control power transmitted from a node in a wireless network. The method includes receiving one or more signals at the node from one or more other nodes of the wireless network, determining a signal-to-interference-plus noise ratio for each signal received from each of the one or more other nodes, transmitting the determined signal-to-interference-plus noise ratio value for each signal received from the one or more other nodes to the respective one or more other nodes, and receiving a signal-to-interference-plus noise ratio value from each of the other nodes in the wireless network. The received signal-to-interference-plus noise ratio value was determined by each of the other nodes. The method further includes determining a minimum signal-to-interference-plus noise ratio for the node, estimating a rate-of-change of the channel gain, and adjusting signals transmitted from the node to the other nodes.

A semi-physical simulation method of an aircraft electric system based on an AGENT modeling technique comprises a method for a virtual operating environment modeling method of intelligent control and test of an aircraft power system, a method for setup of a simulation model of a modern aircraft power system based on a multi-AGENT technique, a method for knowledge base modeling supporting decision assessment, a method for achievement of a semi-physical simulation platform, and a performance assessment method of the aircraft electric system. The method fully embodies a complete simulation model of distributed power control of a modern large aircraft, overcomes disadvantages that the aircraft power system is simulated mainly based on pure software at present and the effect of a load model on the aircraft power system cannot be well considered mostly; on the basis of setting up the model of the aircraft electric system based on the AGENT technique, with the adoption of a high-speed data collecting card, the method can conveniently form an effective semi-physical simulation verification platform together with a voltage regulator of an aircraft power generator and related detecting devices to verify reliability and safety of excitation control of the large aircraft electric system in real time.

The invention relates to a self-adaptive distributed power control method in the telecommunication technology field. The method comprises the steps: first, the initialization to parameters of a wireless customer station and a wireless access point; second, the selection of the wireless access point, and establishment of the connection; third, the calculation of the anticipated throughput of the wireless access point; fourth, the startup of a timer with one-week triggering cycle; fifth, the actual throughput of the wireless access point within one cycle; sixth, the comparison of the actual throughput with the anticipated throughput of the wireless access point one cycle later to confirm whether to increase or reduce the transmission powder of the wireless access point; seventh, the regulated transmission powder value of each wireless access point is written on a configuration file, facilitating the read of the next iteration; eighth, the new iteration. With the fast convergence speed, the invention enhances the network resource utilization efficiency and decreases the calculation complexity.

The invention belongs to the distributed power source control technology field in a micro electrical network system and relates to a micro electrical network common bus voltage imbalance inhibition method. According to the method, direct compensation for bus negative phase-sequence voltage at a PPC node in the micro electrical network system is carried out, each distributed power source in the micro electrical network can automatically respond to bus voltage imbalance degree at the PPC node in the micro electrical network system, adaptive adjustment of a negative phase-sequence voltage compensation controller (UVC) is carried out, so each distributed power source carries out negative phase-sequence wattless output according to the rated negative phase-sequence wattless capacity to maintain the voltage balance degree of the bus at the PCC node. Through the method, the parallel distributed power sources in the micro electrical network are enabled to have a function of imbalance voltage inhibition in the micro electrical network.

A method is provided for operating a distributed power repeater for a train system. The method includes: (a) monitoring all radio traffic on a wireless communications channel used by the repeater to relay distributed power commands between a plurality of transmitters and receivers disposed on a plurality of trains for distributed power control of the trains; (b) determining the level of channel loading on the communications channel; (c) comparing the channel loading to a predetermined limit; (d) if the channel loading is less than the predetermined limit, relaying messages over the wireless communications channel at a first activity level; and (e) if the channel loading exceeds the predetermined limit, relaying messages over the wireless communications channel at a second activity level less than the first activity level.

The invention discloses a pilot protection method containing multi-T-connection inverter interfaced distributed generation power distribution network. The pilot protection method includes the following steps: electrifying a relay protection device; initializing line parameters; setting the practical rated power capacity; setting a constant value Iset for pilot current differential protection; acquiring a voltage phasor and a current phasor; acquiring an active power; calculating the sum of the output power of the distributed generation; calculating an active reference power for a distributed generation control system; calculating the positive sequence voltage of a point of common coupling PCC to acquire the practical output current; according to the current phasor, calculating the sum of the practical output current, and calculating a total differential current Delta I of the line; determining whether the Delta I is greater than Iset; and determining that a fault in the area occurs and starting a protective action if so, or expressing that no fault occurs in the area if not. The pilot protection method containing multi-T-connection inverter interfaced distributed generation power distribution network is suitable for a line containing an arbitrary number of T distributed generation, and is not influenced by a fault type, a transition resistor, distributed generation capacity and other factors, thus being high in applicability and reliability and having high practicability during the engineering practice process.

A system and method for distributed power control in a communications system are provided. A method for relay node operations includes transmitting a signal at a transmit power level on a first channel from a relay node to a user equipment, receiving a message comprising a first indication of channel quality of the first channel at the transmit power level, and determining a second indication of channel quality of a second channel between a communications controller and the relay node, where the first channel and the second channel are in a same multi-hop communication path. The method also includes altering the transmit power level of the first channel based on the first indication of channel quality and the second indication of channel quality to converge the channel quality of the first channel to a convergence value.

The invention discloses a medium access control method based on a CDMA underwater acoustic network for improving the network throughput, shortening end-to-end time delay and reducing the energy consumption so as to prolong the service life of the network. The invention adopts a CDMA access mode and a distributed power control technology, and nodes participating information transmission dynamically adjust data sending power according to network conditions on the premise that the nodes do not influence the normal sending and receiving of adjacent nodes so as to overcome the near-far effect existing in a CDMA system. Meanwhile, the invention improves a handshake mechanism in a traditional medium access control method, uses a data pocket to replace an ACK as a response for successful interaction in case of satisfying special conditions and can obtain higher performance under the conditions of different network loads so as to be effectively applied to reliable data transmission in the underwater acoustic network.

The invention discloses a method for distributing a plurality of power control instructions via the virtual scheduling, which is characterized in that the invention comprises the following steps: step1: the base station collocates the service sources and continuously distributes power control instructions; step 2: the base station distributes the confirmed or disconfirmed message to the terminal.The method can make full use of the current practice of transmitting one power control instruction within a transmission time interval to realize the distribution of a plurality of power control instructions within a longer transmission time interval, which increases the power control accuracy and system throughput and is conducive to realization within the framework of the prior technology.

The invention discloses a distributed power control method for a Femtocell uplink. In the method, based on a game theory, for a Femtocell and a macrocell base station, the maximum transmission power of a Femtocell user is limited so as to ensure that a preset signal to interference plus noise ratio (SINR) of a macro user of the macrocell base station is achieved for the macro user of the macrocell base station, and accordingly, the self preset SINRs of more Femtocell users are achieved for the more Femtocell users by means of game iteration. According to the invention, on the premise of guaranteeing the system capacitive properties, the power control for the Femtocell users is preformed in a game manner by regulating the upper limit of the transmission power of the Femtocell users, different SINR requirements of different Femtocell users are taken into consideration, all the Femtocell users are ensured to achieve the self preset SINRs as much as possible, and the distributed power control method disclosed by the invention has better performances compared with the conventional method.

The invention discloses a method for analyzing a fault of a micro electrical network containing a V / f control inversion type distributed power source. The method combines control strategies of a distributed power source with output characteristics, a fault equivalence model of the distributed power source is firstly brought forward, a fault node voltage equation of the micro electrical network containing the V / f control inversion type distributed power source is then established, solution is realized, and accurate fault analysis on the micro electrical network containing the V / f control inversion type distributed power source power is realized. According to the method, the control strategies of the distributed power source and the output characteristics are combined, the new transient equivalence model of the distributed power source is established, so fault current characteristics of the distributed power source can be more truly reflected; the micro electrical network fault analysis method is provided on the basis, improves accuracy of fault analysis, provides scientific bases for equipment type selection and protection setting of the micro electrical network containing the V / f control inversion type distributed power source and has quite strong practicality in engineering practice.

The front-end device in radio frequency (RF) includes following units: distribution type control unit in use for carrying out distribution type power supply control for each unit in front-end unit (FEU) in RF in order to reduce starting up power consumption, and idle consumption; a control unit for bias of small signal amplifier in use for controlling gain of small signal amplifier in FEU in RF; a loop filter control unit of frequency synthesizer in use for controlling time for switching frequency of frequency synthesizer in FEU in RF in order to reduce waste of energy sources under switch states of FEU in RF; a control unit for bias of power amplifier in use for controlling the output power of power amplifier in FEU in RF. Comparing with prior art, the invention solves issues of switching states slowly, poor real-time capability to adjust gains of transmitting power and small signal amplifier, and single power supply management.

A brake control system for a distributed power vehicle system includes a brake system and a distributed power control system in a first vehicle, and first and second separate communication links between the brake system and the distributed power control system. In operation, upon the initiation of a penalty brake application, the brake system transmits information about the brake level of the penalty brake application to the distributed power control system, over at least the first communication link. However, if the first communication link fails, the brake system redundantly transmits the information about the level of the penalty brake application to the distributed power control system over the second communication link. The information is transmitted from the distributed power control system in the first vehicle to remote vehicles for carrying out the penalty brake application.

The invention discloses a distributed power control method based on an interference mean field in a super-dense D2D network. The distributed power control method based on interference mean field in a super-dense D2D network comprises the following steps: based on a mean field game theory framework of mean field approximation, an objective function is designed according to energy efficiency and consumed power; a relevant Hamilton-Jacobi-Bellman equation and a Fokker-Planck-Kolmogorov equation are exported on the mean field game theory framework; and the Hamilton-Jacobi-Bellman equation and the Fokker-Planck-Kolmogorov equation are solved based on a finite difference algorithm, and thus, a power control strategy oriented towards energy and interference perception is obtained. The objective function is designed according to energy efficiency and consumed power, and the power control strategy oriented towards energy and interference perception is put forward, and therefore, the spectrum efficiency and energy efficiency are improved.

The invention relates to a distribution generation control method and in particular relates to a distribution generation control method adaptive to an OLTC (On Load Trap Changer) voltage adjustment mode. The distribution generation control method comprises the following steps: measuring voltages of different nodes of a system; checking whether a DG (Distribution Generation) is accessed or not under a condition that the voltage of a node exceeds a limit; if no DG is accessed, performing voltage adjustment in an OLTC voltage adjustment mode directly, and adjusting an OLTC sub-connector to complete voltage adjustment; if the DG is accessed, calculating inactive power which needs to be absorbed by an inverter according to active power emitted from the DG, absorbing the inactive power by the inverter, further checking whether limit exceeding of voltages of different nodes is caused or not, if no limit exceeding is caused, completing voltage adjustment; if limit exceeding is caused, adjusting the OLTC sub-connector to complete voltage adjustment. The control method provided by the invention aims to single DG, fluctuation of a voltage can be reduced, the utilization rate of new energy canbe ensured, meanwhile the method can be very well adaptive to an OLTC voltage adjustment strategy, the upgrading transformation of a power distribution grid can be retarded, and the investment cost can be lowered.

The invention discloses a heterogeneous network energy saving method. The method comprises the steps as follows: a macro base station user determines whether HeNB (Home evolved NodeB) is accessed or not according to the quality of a signal; when the signal-noise ratio of the HeNB is larger than or equal to that of the macro base station, the HeNB is accessed, if not, the HeNB is not accessed; and after the HeNB is accessed into the macro base station, macro base station transmitting power and accessed HeNB transmitting power, and the minimum value of the transmitting power of the macro base station is reserved to ensure the service quality. According to the invention, firstly, pricing technology is used for exciting the HeNB to receive the user of the macro base station, thereby offering better service for users located in special positions and enlarging the throughput capacity of a system; in addition, interference between the macro base station and the HeNB, and HeNBs is lowered via distributed power control, so as to achieve the maximization of the energy efficiency of the system; and lastly, owing to the reduction of the transmitting power of the macro base station, energy conversation is realized, and the operation cost of operators is lowered.

The invention discloses a microgrid energy management method in an electricity market. According to the microgrid energy management method, a MEMS (microgrid energy management system), by combination with real-time electricity price on the market, distributed type power supplier quoted prices, unit capacity and other information, formulates a distributed type power supplier production plane through optimization degree on the basis of renewable energy output predication and a load predication technology; meanwhile, a control scheme on load sides is determined; an optimized scheme is transmitted to a partial controller, such as a distributed type power supply controller and a load controller through information; the distributed type power supply controller controls the unit output while the load controller controls controllable loads according to the optimized scheme; the minimization of the operating costs of the power suppliers and the bidding subsidy costs of the load sides is taken as the target; and all users participated in the object need to execute a control plan instruction issued by the MEMS according to decision information. By adoption of the method, user participation is stimulated through an incentive mechanism; and for the subsidy bidding method for the load sides, the users can control the quoted prices to control benefits of their own.

The invention discloses an active power distribution network voltage control method and system based on a virtual cluster, and belongs to the field of distributed power supply control. Distributed power supplies in an area are integrated and controlled, so that the control quantity can be remarkably reduced, and the "dimension disaster" brought for a centralized controller due to the fact that thedistributed power supplies are connected to a power distribution network in a high-permeability mode can be effectively avoided. A distributed power supply master station control center, a distributed power supply cluster and a distributed power supply station are used for carrying out layered optimization control on active and reactive outputs of the distributed power supplies connected to the power distribution network in a dispersed mode; the master station control center generates a cluster control instruction; and a cluster management and control device receives the cluster control instruction and distributes the cluster control instruction to the distributed power supply station, so that safe and economic operation of the power distribution network is achieved. Meanwhile, in view ofthe randomness and volatility of the outputs of the distributed power supplies, autonomous control is carried out by the distributed power supply station, and a method of PI control with dynamic optimization is adopted, so that the safety and stability of a master station cluster control interval station are guaranteed.

The invention discloses a distributed power supply cluster control system which comprises a distributed power supply cluster monitoring main station and a plurality of distributed power supply clusters. Each of the distributed power supply clusters comprises a distributed power supply cluster management device connected to the distributed power supply cluster monitoring main station and multiple distributed power supplies connected to the distributed power supply cluster management device. The invention also discloses a control method of the distributed power supply cluster control system. The method comprises the steps that the distributed power supply cluster monitoring main station monitors a grid operation state in real time, carries out area optimal flow calculation, obtains the active power control constant value, the reactive power control constant value, the power factor control constant value and the voltage control constant value of each distributed power supply cluster in an optimal flow condition, issues the control constant value of the distributed power supply cluster to the distributed power supply cluster management device, and the distributed power supply cluster management device carries out distributed power supply control. According to the system and the method, the influence on the safety stability of a power grid by a distributed power supply grid connection can be reduced.

The invention relates to the technical field of control of an inversion-type distributed power supply, in particular to a self-adaptive damping control strategy of a virtual synchronous generator technology (VSG)-based inversion-type distributed power supply. An active power transfer function is built for a control system of the VSG-based inversion-type distributed power supply, the self-adaptivedamping control strategy is made by analyzing influence of a damping coefficient on system output, and the strategy is used for changing the damping coefficient to achieve adjustment n system responserate and reduce fluctuation of the system generated by disturbance according to deviation between an active power output from the inversion-type distributed power supply in real time and a set activepower reference value. By the self-adaptive damping control strategy, control of the grid-connected inversion-type distributed power supply can be achieved, the output characteristic of the inversion-type distributed power supply is more excellent by the control strategy, the interference of the system can be handled very well, stable output is maintained, the control strategy has higher dynamiccharacteristic, and an effective strategy is provided for control of the inversion-type distributed power supply in a power distribution network.