152 results about "Micro power source" patented technology

The invention relates to a park energy-network energy optimizing management system based on microgrids and an implementing method of the system. The energy optimizing management system is implemented by park energy scheduling and microgrid energy management. The micro power grid management system is in a three-layered structure including a microgrid energy scheduling layer, a microgrid centralized control layer and a microgrid, stored energy and load local control layer. Constraint conditions of the energy optimizing management method are guaranteed by the microgrid centralized control layer. The output of each microgrid or stored energy is determined by a microgrid and stored energy coordination control policy in a microgrid central controller; and an objective function includes three objective function subsets at different grades. Through computing the objective function values at various states by a multi-objective optimizing algorithm based on weight, the defect of randomness and intermittence of the distributed power source is overcome, the complementary problem among multiple microgrids and multiple micro power sources in the microgrid in the park energy network is solved, and optimized utilization of clean energy and maximization of system energy efficiency can be achieved.

The present invention relates to a micro-power source for successfully implementing a microgrid and to a control method for realizing smooth reconnection between the microgrid and an upper electric power system and smooth switching between the control modes of the micro-power source. A micro-power source sectionalizes an electric power system into an upper electric power system and a lower electric power system, and enables the lower electric power system to be independently operated in an island mode and to smoothly switch between a grid-connected mode and the island mode. As a result, a hierarchical microgrid is implemented with sectionalized sub-microgrids. One of the merits of the hierarchical microgrid is that each consumer group can be supplied with high quality power regardless of the power quality of the other consumer groups, and various types of services independently.

A micro-sized power source. A piezoelectric power generator, capable of harvesting energy from environmental vibration with lower level frequency, including a dielectric frame loosely containing a piezoelectric panel. The piezoelectric panel includes an electrode and a piezoelectric layer formed over an electrode and dielectric layer and an end mass formed on the piezoelectric layer. The end mass provides weight to cause the piezoelectric panel to move (vibrate) within the frame and causes the generation of electrical power.

The invention relates to the micro-energy field, in particular to a vibratory drive composite micro-power source based on the piezoelectric effect and the electromagnetic induction. The micro-power source adapts the requirement of the micro electro mechanical system development for the micro-energy and comprises a substrate, a peripheral base, cantilevers and a mass block, wherein the substrate is fixed with the lower surface of the peripheral base by bonding; a vertical through hole is arranged in the middle of the mass block; an induction coil is processed on the upper surface and/or the lower surface of the mass block; a micro permanent columnar magnet is fixed on the upper surface of the substrate; PZT piezoelectric thin films are arranged on the cantilevers; a plurality of external lead bonding pads are arranged on the peripheral base; and the two ends of the induction coils and the two polarized surfaces of the PZT piezoelectric thin films are respectively connected with the corresponding external lead bonding pads by leads. The power source has reasonable and concise structure, is liable to miniaturization and integration, and can provide power to the micro electro mechanical systems at high output energy density and high output efficiency, realize self power supply of the micro electro mechanical systems and meet the requirement of the micro electro mechanical system development for the micro-energy.

A floor-cleaning apparatus includes a cleaning head having a cleaning device, a control handle connected to the cleaning head for controlling the cleaning head and a micro power source in communication with the cleaning device. The micro power source is lightweight, compact, and rechargeable or replaceable for generating energy to power the cleaning device.

The invention discloses a minitype composite vibration power generator belonging to the field of minitype power technology and energy-saving technology. The minitype composite vibration power generator is a cantilever beam vibration power generator compounded by piezoelectricity and electromagnetism and mainly comprises an insulating shell, a piezoelectric cantilever beam, a permanent magnet and an inductance coil, wherein the piezoelectric cantilever beam consists of a piezoelectric sheet and a supporting substrate; the piezoelectric sheet is bonded on the supporting substrate; one end of the supporting substrate is fixed on the insulating shell; the permanent magnet is bonded with a free end of the piezoelectric cantilever beam; and an inductance coil is arranged right above the permanent magnet. Under the resonant state, the power generator synchronously outputs the piezoelectric current and the electromagnetic current; the output power is improved within the finite volume; furthermore, by adopting the structure of dispersing mass blocks, the energy collecting density is improved, and the working frequency scope is enlarged simultaneously.

The invention discloses a method for parallel operation control suitable to be used for a microgrid inverter. The method comprises: step 1, adding virtual impedance in a voltage and current loop of conventional droop control; step 2, through measuring output voltage and current values of a micro power source, obtaining average active power and average reactive power; step 3, obtaining output frequency and voltage of the micro power source; step 4, comparing the output voltage, frequency, and reactive power of the micro power source with corresponding reference values, to obtain respective difference values; step 5, obtaining required compensation values of voltage, frequency, and reactive power; step 6, obtaining compensated frequency and voltage; step 7, inputting the compensated frequency and voltage to a voltage and current double-loop controller, and finally the frequency and voltage are maintained at rated values, the reactive power is distributed rationally. The method realizes technical effects of improving electric energy quality and rationally distributing reactive power, and distribution precision of the reactive power is relatively high.

The invention discloses a photovoltaic micro power source control system for a micro grid, which comprises a photovoltaic micro power source main circuit which respectively accesses the micro grid and a load through a solid-state switch STS, and a photovoltaic micro power source controller which is connected with the photovoltaic micro power source main circuit through a drive board, wherein the photovoltaic micro power source controller comprises a highest power spot tracking control module, an active and passive power computation module, a storage battery charging and discharging control module, a power angle control module, a passive power-voltage control module and a PWM generator. The photovoltaic micro power source control system for the micro grid specially controls a photovoltaic micro power source to connect into the micro grid, and ensures the stability so as to effectively realize the high-efficient, environment-friendly and high-quality power supplying micro grid and beneficially complement a large power system.

The invention relates to a microgrid optimization method based on an improved binary system particle swarm optimization algorithm. For a microgrid containing various micro power sources, taking start-stop strategies of controllable micro power sources into account, a microgrid optimization operation mathematical model considering economic costs and environmental benefits is established. An improved binary system particle swarm optimization algorithm based on a catfish effect is provided, output of the micro power sources in the microgrid in each period of time is solved under different control strategies. A specific microgrid including wind, light, a micro gas turbine, a fuel cell and a diesel generator is used as an embodiment, and embodiment analysis is performed.

A liquid dispenser includes a reservoir for holding a liquid, and a chamber in communication with the reservoir. The chamber receives the liquid, and a micro power source generates electricity for heating the liquid disposed in the chamber. A nozzle is included for releasing the heated liquid from the chamber through an orifice in the nozzle.

The invention belongs to the field of distributed power generation and smart power grid control, relates to a neural network-based microgrid energy coordination central processor, and particularly provides a smart energy central controller which can utilize a BP (Back Propagation) neural network to control a microgrid comprising a wind power generation unit, a gas turbine generation unit, a PV (photovoltaic) generation unit, a load tap changing transformer, various loads and other units. In the implementing process, actual power of each micro-power supply, loaded actual power and system frequency are utilized as 9 input nodes of the neural network controller; and a network mapping relationship between the 9 input nodes and 11 output nodes is constructed by using a single hidden layer BP neural network containing 12 hidden layer nodes, so that energy balance management of a microgrid system is controlled, and self-adaptive connection between the microgrid and large grids is realized.

The invention discloses a control method of an AC/DC two-way power converter used for an AC/DC hybrid micro-grid, and belongs to the technical field of electronic pulse width modulation of electric power. The control method particularly comprises the steps that when the AC/DC hybrid micro-grid operates in a networking mode, constant voltage is adopted to control a DC micro power source, constant power is adopted to control an AC micro power source, and therefore the two-way power converter transmits rated power to the micro-grid; when the AC/DC hybrid micro-grid operates in an islanding mode, constant voltage and constant frequency are adopted to control the AC micro power source, constant voltage is adopted to control the DC micro power source, and therefore active power between AC/DC micro-grids is balanced. On the basis of voltage control, the control item of the active power is introduced, the power flow between the AC/DC micro-grids is effectively balanced, and the stability and controllability of system networking operation and islanding operation are improved.

The invention discloses a multi agent-based power transmission and distribution network and distributed type supply source coordinated control system. A power transmission and distribution network dispatching center is connected with a plurality of power distribution networks; the distribution networks are connected with a plurality of micro grids; the micro grids are connected with a plurality of micro grid components; each micro grid component includes a micro power source apparatus; and the coordinated control system includes a micro grid component agent layer which is used for micro power source optimal control, energy storage devices and controllable loads, a micro grid agent layer used for micro grid-level power grid dispatching operation control, a power distribution agent layer used for medium-voltage network and low-voltage network operation control, and a power transmission network agent layer used for the operation control of a whole power grid . According to the multi agent-based power transmission and distribution network and distributed type supply source coordinated control system of the invention, a power transmission and distribution system comprising distributed power sources is divided into agents with different functions; and through control on each agent and interaction between the agents, hierarchical coordinated control on the power transmission and distribution system comprising the large-scale distributed power sources can be realized.

The invention provides a zero balance node microgrid robustness scheduling method containing uncertainty budget adjustment. The method includes generating an optimal solution set through constructing a microgrid robustness optimization scheduling model by taking system safety operation as a constraint in the premise of aiming to minimizing operation cost, environment cost and renewable energy fluctuation; taking grey entropy relevance as an evaluation index of the optimization solution set and constructing a microgrid robustness scheduling method by taking the grey entropy relevance as an prioritizing index; predicating the uncertainty budget of current microgrid scheduling through a mapping rule based on the current state and the history state of an energy storage system and finally selecting an optimal solution objectively to be a power generating unit output command through the grey entropy relevance. According to the invention, resistance of the system to uncertainty factors can be enhanced effectively and good operability is achieved. Control and adjustment are integrated with each other in the uncertainty budge adjustment strategy, and control features of a micro power source is adjusted at the same time of allocating a micro power source power generation plan. Therefore, a power generation plan is made for the microgrid in an economical and environment-friendly manner and the scheduling process is good in robustness. Over charge and over discharge of the energy storage system can be avoided effectively.

The invention discloses a load demand response-based grid-connected micro power grid reliability assessment method comprising the following steps: an annual output curve of a micro power source in a micro power grid is determined; time-of-use electricity prices are made in a micro power grid island, and a response electricity price model for micro power grid users is built; a load satisfaction index MLs of new energy of the micro power grid can be determined according to output of the micro power source of the micro power grid and load power; a load demand response model is built based on four constraining factors that are electricity quantities of loads, electricity prices, power and user satisfaction over consumption habit change; an object function is min(1-MLS), a variable is a variable quantity [delta]p of electricity price at each time segment, a particle swarm algorithm is used for solving the load demand response model, a corrected load curve is obtained, and corrected load curve-based grid-connected micro power grid reliability can be determined based on a combined output mode of a micro power grid rack structure, energy storage equipment and a distributed power source. The grid-connected micro power grid reliability assessment method can help overcome defects of a conventional micro power grid reliability assessment algorithm and is suitable for micro power grid reliability assessment under load demand response strategies.

A warming dispenser includes a housing having a compartment. The compartment holds a plurality of sheets. A heating device is located adjacent the plurality of sheets. A micro power source is connected to the heating device to generate energy from a fuel source, wherein the heating device uses the energy to warm at least one of the sheets. The micropower source may be, for example, a micro fuel cell adapted to deliver electricity for resistive heating.

Provided are semiconductor elements 107A, 107B, and 107C that allow a current to flow that is at most a maximum current determined by the level of control signals VGA, VGB, and VGC and that depends on the difference between the voltage of a DC power supply BA and the charging voltage of a capacitor 102, a controller 105 that outputs a control signal to each semiconductor element, and a temperature detection circuit that detects the temperature of each semiconductor element. Until a predetermined time elapses after the electric circuit is closed, the controller 105 adjusts the level of each control signal based on the temperature detected by the temperature detection circuit so that current through the electric circuit does not exceed a current limit, and after the predetermined time period elapses, the controller 105 adjusts the level of each control signal so that current through the electric circuit is allowed to exceed the current limit.

The body temperature lowering air conditioning clothing driven with micron and nanometer fan array includes one micro fan array; and the micro fan array consists of at least one micro fan woven into clothing. The micro fan is connected to the outer micro power source through the circuit lines woven into clothing; the micro power source has voltage of 3-12V; and there is switch set in the circuit lines for controlling the on-off of the micro fan. The power source driven fan can realize the local temperature regulation of human body by means of local forced convection and evaporating heat dissipation. The present invention has compact structure and high reliability and has import application value in high temperature environment.