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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 21. Отображено 21.
14-04-2023 дата публикации

High-power-factor bipolar pulse type power supply suitable for dielectric barrier discharge

Номер: CN115967295A
Принадлежит:

The invention discloses a high-power-factor bipolar pulse type power supply suitable for dielectric barrier discharge. The power supply is composed of a passive power factor correction part and a bipolar high-frequency high-voltage pulse excitation voltage generation part. The power supply not only can provide bipolar high-rise-rate excitation for a load, but also can enable the whole power supply to work in a high-power-factor and low-harmonic-distortion state.

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23-07-2014 дата публикации

Cooperative control method suitable for multi-subnet structure micro-grid

Номер: CN103944169A
Принадлежит:

The invention discloses a cooperative control method suitable for a multi-subnet structure micro-grid. The micro-grid is composed of a plurality of backbone subnets and common subnets, and the subnets comprise and are not limited by loads, renewable energy source power sources, energy storage devices, reactive compensation devices and the like. All the subnets are decided to be the backbone subnets or the common subnets in a self-adaptive mode according to the power generation, energy consumption and energy storage states of the subnets, the maximum output capacity of the subnets and the states of the adjacent subnets on the premise of not damaging the power supply continuity and reliability of the micro-grid, and therefore the subnets of the micro-grid can be utilized efficiently, the requirement for the stable operation of the micro-grid can be met, and the large-scale efficient utilization of the micro-grid is achieved.

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25-03-2015 дата публикации

Strategy for synthesizing output impedance of micro-grid formed by multiple micro-units

Номер: CN104467008A
Принадлежит:

The invention relates to a strategy for synthesizing the output impedance of a micro-grid formed by multiple micro-units. The micro-grid is formed by the multiple micro-units. Under the cooperation of a micro-grid controller, the synthesis impedance of the output impedance of the micro-units is reflected to be constant or short-time constant impedance for a public grid, and the output synthesis short-time constant impedance of the micro-grid can be adjusted in a time-section-divided mode according to the state of the micro-grid so that the requirement of the public grid for stable scheduling of the micro-grid can be met, and efficient use of the micro-grid can be achieved.

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25-04-2023 дата публикации

Bipolar intermittent pulse power supply suitable for DBD load

Номер: CN116015094A
Принадлежит:

The invention discloses a bipolar intermittent pulse power supply which is suitable for a dielectric barrier discharge (DBD) load. The bipolar intermittent pulse power supply is applied to the DBD load. By means of resonance of the external inductor, the transformer excitation inductor, the external capacitor and the DBD load, bipolar intermittent pulse excitation voltage is generated on the DBD load, efficient utilization of parasitic parameters of the transformer is achieved, and it is ensured that all power devices work in a soft switching state. Compared with other types of power supplies, the power supply disclosed by the invention has the advantages of capability of giving full play to DBD load characteristics, high efficiency and compact structure.

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02-06-2023 дата публикации

Bipolar pulse current source type driving circuit suitable for dielectric barrier discharge

Номер: CN116208019A
Принадлежит:

The invention discloses a bipolar pulse current source type driving circuit suitable for dielectric barrier discharge. The bipolar pulse current source type driving circuit is composed of a direct current energy storage loop and a current pulse generation loop, and pulse excitation is provided for a dielectric barrier load by controlling the conduction time sequence of three power switch tubes in the driving circuit. The driving circuit disclosed by the invention not only can generate bipolar pulse excitation waveforms on the dielectric barrier load, but also has the advantages of simple structure and simplicity and convenience in control.

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23-07-2014 дата публикации

Maximum power output control method suitable for controlling variable speed wind turbine group through concentrated variable flow

Номер: CN103939287A
Принадлежит:

The invention discloses a maximum power output control method suitable for controlling a variable speed wind turbine group through concentrated variable flow. According to n wind turbines which are controlled by the same converter in a concentrated mode and are constant in rotating speed and different in input air speeds, the concentrated converter and overall wind turbine propeller pitch variation mechanisms are controlled in a coordinated mode, and therefore maximum power output of the wind turbine group is achieved. A control objective of the concentrated converter is that the speed of the wind turbine with the higher wind speed approaches to the optimal rotating speed as much as possible and a control objective of the propeller pitch variation mechanisms is that the highest wind energy utilization rate of the wind turbine with the lower wind speed is obtained at the unified rotating speed of the wind turbine group. The optimal calculation method is adopted and the frequency conversion ...

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23-07-2014 дата публикации

Rapid n-level multi-level inverter space vector pulse width modulation algorithm

Номер: CN103944438A
Принадлежит:

The invention discloses a rapid n-level multi-level inverter space vector pulse width modulation algorithm. According to the algorithm, the non-homogeneous linear equation system, mapped between a basic vector and switching state vectors, in the SVPWM algorithm is converted into the homogeneous equation system by establishing a constraint function under the specific conditions, the unique switching state vector corresponding to the basic vector under the specific constraint conditions can be obtained by solving the new homogeneous equation system, an appropriate switching state vector corresponding to the basic vector is prevented from being found in multiple redundant switching state vectors, and the switching state vector corresponding to the basic vector can be rapidly and accurately calculated. The n-level multi-level inverter SVPWM algorithm is simplified, and therefore the SVPWM algorithm is suitable for any n-level multi-level inverters, and the SVPWM algorithm can be easily popularized ...

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23-07-2014 дата публикации

Micro-grid subnet structure and control method with constant and time-sharing output impedance

Номер: CN103944187A
Принадлежит:

The invention discloses a micro-grid subnet structure and control method with constant and time-sharing output impedance. The subnet structure comprises a continuous load, a non-continuous load, a storage battery, a bidirectional inverter of the storage battery, a photovoltaic cell, an inverter of the photovoltaic cell, a var generator, other energy, inverters of other energy, a subnet output impedance controller and an active filter. The resistive impedance output by subnets is controlled by controlling active components of charging and discharging currents of the storage battery, active components of output currents of the photovoltaic inverter and switching of the non-continuous load, the inductive impedance output by the subnets is controlled by controlling reactive components of all inverter output currents of the subnets and reactive currents of the var generator, and therefore the constant and time-sharing subnet output impedance is achieved so as to meet the dispatching requirement ...

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06-06-2023 дата публикации

High-power-factor unipolar pulse driving circuit suitable for DBD load

Номер: CN116232109A
Принадлежит:

The invention discloses a high-power-factor unipolar pulse drive circuit suitable for a DBD load. The high-power-factor unipolar pulse drive circuit comprises a power factor correction unit, a unipolar intermittent pulse excitation generation unit and a power device drive circuit. The topology disclosed by the invention not only can provide pulse excitation with high rise rate and intermittent time for the dielectric barrier discharge load, but also can realize the technical indexes of high power factor and low total harmonic distortion.

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27-08-2014 дата публикации

Dielectric barrier discharge type ozone generator power supply based on direct-current interlaced boost and alternating-current resonance network

Номер: CN104009634A
Принадлежит:

The invention provides a dielectric barrier discharge type ozone generator power supply based on a direct-current interlaced boost and alternating-current resonance network. The dielectric barrier discharge type ozone generator power supply comprises a rectifier module, two boost converters, a full bridge inversion circuit, a single-stage LC resonance circuit, a sampling conditioning circuit, a control circuit and a dielectric barrier discharge type ozone generator. According to the dielectric barrier discharge type ozone generator power supply, a direct-current power supply A and a direct-current power supply B which are controlled in a closed-loop mode respectively are obtained by means of the two boost converters, the two power supplies and the single-stage LC resonance circuit are combined through the full bridge inversion circuit, so that a voltage at the ozone generator end rapidly becomes a kilo-volt voltage. The dielectric barrier discharge type ozone generator power supply is simple ...

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23-07-2014 дата публикации

Low voltage ride through performance improvement method for doubly-fed wind turbine with Crowbar device

Номер: CN103944188A
Принадлежит:

The invention provides a low voltage ride through performance improvement method for a doubly-fed wind turbine with a Crowbar device. A device composed of a doubly-fed motor, a permanent magnet motor and a permanent magnet motor driving converter is newly added on the basis of a doubly-fed wind turbine mainstream topological structure composed of a doubly-fed wind generator, a rotor side converter, a direct-current side capacitor, a power grid side converter, the Crowbar device and a main control system,. While the Crowbar device is connected with a rotor winding of the doubly-fed wind generator in a short-circuit mode, the frequency of a stator winding of the doubly-fed wind generator is made to be actively matched with the rotation speed of the doubly-fed wind generator by regulating the rotation speed of the newly-added doubly-fed motor, and therefore reactive power absorbed by the doubly-fed wind generator from the power grid is reduced, power grid voltage secondary drop caused by the ...

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23-07-2014 дата публикации

N-stage multi-level inverter SVPWM algorithm for optimizing switching routes

Номер: CN103944432A
Принадлежит:

The invention discloses an n-stage multi-level inverter SVPWM algorithm for optimizing switching routes. According to the algorithm, on-off state vectors corresponding to basic vectors are mapped to a three-dimensional space coordinate system, each reference voltage vector corresponds to three corresponding effective on-off state vectors according to a traditional SVPWM algorithm, the three on-off state vectors form a space triangle, state space vector switching route models are set up inside the space triangles and between every two adjacent space triangles through the Hamilton directed graph Christofides algorithm, and the switching routes between the three peak vectors in each triangle and switching routes between every two adjacent triangles are optimized. According to the n-stage multi-level inverter SVPWM algorithm, a cascading multi-level inerter SVPWM algorithm is simplified, output voltage performance indexes of an inverter and performance of the inverter are easily improved, and ...

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30-07-2014 дата публикации

Grid connection method for single-phase voltage-source-type inverter power supply

Номер: CN103956776A
Принадлежит:

The invention discloses a grid connection method for a voltage-source-type single-phase inverter power supply and a public power grid. The grid connection method includes the following steps: a step of forming voltage phase orthogonal signals of the inverter power supply and a single-phase public power grid, a step of forming inverter-power-supply reference signals and a step of grid connection condition judgment. In the step of forming the voltage phase orthogonal signals, a sine value and a cosine value of the voltage phase are formed through a phaselock technique. The step of forming inverter-power-supply reference signals is mainly used for making three elements (amplitude, phase and frequency) of the inverter-power-supply reference signals change with three elements of the public power supply. The step of grid connection condition judgment is mainly used for analyzing whether the voltage-source-type inverter power supply is equipped with conditions for performing grid connection with ...

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23-07-2014 дата публикации

Power grid friendly transformation method suitable for constant-speed wind turbine generator set

Номер: CN103944189A
Принадлежит:

The invention discloses a power grid friendly transformation method suitable for a constant-speed wind turbine generator set. According to a constant-speed wind turbine generator set canonical topology structure composed of a wind turbine, a gearbox, an induction generator and a compensating capacitor, a set of power grid friendly transformation device composed of a doubly-fed motor, a permanent magnet motor and an alternating-direct-alternating current converter is newly added on the basis of the equipment. The power grid friendly transformation device is reasonably controlled, the power grid friendly degree of the constant-speed wind turbine generator set can be improved, and the functions of smoothing output power, achieving low voltage ride through and enhancing the reactive supporting capacity in the low voltage ride through period are specially achieved. The method is suitable for independently carrying out power grid friendly transformation on the single constant-speed wind turbine ...

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04-03-2015 дата публикации

Dielectric barrier discharge type ozone generator power supply with constant peak voltage and current

Номер: CN104393783A
Принадлежит:

The invention discloses a dielectric barrier discharge type ozone generator power supply with constant peak voltage and current. The power supply mainly comprises an inverter circuit, a resonant network, a boosting transformer, a dielectric barrier discharge type ozone generator body, a power control circuit and the like. According to the dielectric barrier discharge type ozone generator power supply, generator current and voltage peak can be kept basically constant within an entire power adjustment range under capacitive PFM (Power Frequency Modulation) control to guarantee that the generator is in a high-efficiency discharge state all the time. Besides, each power device in the circuit can work in a soft switching condition to guarantee high-efficiency operation of the power supply. The entire power supply has the characteristics of simple circuit structure, small loss and simple control.

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23-11-2011 дата публикации

Off-grid double-fed wind power generation system and maximum wind energy capture method thereof

Номер: CN0102255596A
Принадлежит:

The invention provides an off-grid double-fed wind power generation system and a maximum wind energy capture method thereof. The power generation system comprises a double-fed generator, a rotor side converter, a load side converter, a bidirectional DC/DC (direct current) converter, a load side variable-current controller, a rotor side variable-current controller, a DC/DC variable-current controller and the like. The load side variable-current controller adopted by the invention can calculate a stator current reference value required for realizing the maximum wind energy capture according to the wind turbine speed and a maximum power curve, input a deviation between the stator current reference value and a feedback value to a proportional integral controller, produce a control voltage of the load side converter and generate a space vector PWM (pulse width modulation) signal to drive a power switch device of the load side converter. The rotor side converter can control the stator voltage ...

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02-05-2023 дата публикации

Sliding mode control method, device and equipment suitable for DBD load power supply

Номер: CN116054625A
Принадлежит:

The invention discloses a sliding mode control method, device and equipment suitable for a DBD load power supply, and the method comprises the steps: obtaining a working current peak value of a DBD load in a current working period according to the working current of the DBD load; according to the working current peak value, the working current peak value reference value of the DBD load, the working current peak value allowable maximum error value and the calculation formula of the sliding mode function, obtaining a control variable value of the power supply; determining the working mode of the power supply in the next working period according to the control variable value; and obtaining a driving signal according to the working mode to drive a switching tube of the power supply. According to the sliding mode control method, device and equipment suitable for the DBD load power supply, the dynamic characteristics of the power supply can be effectively improved, and the robustness of the power ...

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16-05-2023 дата публикации

High-power-factor bipolar current source type dielectric barrier discharge power supply

Номер: CN116131652A
Принадлежит:

The invention discloses a high-power-factor bipolar current source type dielectric barrier discharge power supply. The power supply disclosed by the invention is mainly composed of a power factor correction circuit and a pulse excitation generation circuit. The high-power-factor bipolar current source type dielectric barrier discharge power supply not only can generate high-frequency bipolar pulse excitation on the dielectric barrier discharge load, but also can realize the functions of power factor correction and soft switching, and in addition, the high-power-factor bipolar current source type dielectric barrier discharge power supply disclosed by the invention is compact in overall structure and low in cost. And the manufacturing and the use are very convenient.

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22-04-2015 дата публикации

Active and reactive current separation method suitable for single phase low-harmonic-wave environment

Номер: CN104535826A
Принадлежит:

The invention provides an active and reactive current separation method suitable for a single phase low-harmonic-wave environment. An active power momentary value of a single phase circuit is calculated by building current components and voltage components orthorhombic with the load current and the power grid voltage respectively. According to the principle that the active current is judged by active power steady state components, on the basis that the active power steady state components are calculated, the active current of the load current is obtained through calculation. According to the condition that the load current can be separated into a sum of the active current and the reactive current in the low-harmonic-wave environment, reactive current components can be obtained. The separation method does not depend on a phase lock circuit, and the active current and the reactive current of the load current in the low-harmonic-wave environment can be rapidly and accurately separated.

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10-09-2014 дата публикации

Dielectric barrier discharge-type ozone generator power supply without intermediate-frequency or high-frequency step-up transformer

Номер: CN104038087A
Принадлежит:

The invention discloses a dielectric barrier discharge-type ozone generator power supply without an intermediate-frequency or high-frequency step-up transformer. The dielectric barrier discharge-type ozone generator power supply comprises a direct-current input power supply, a single-phase full-bridge inverter circuit, an LCLC resonant network and a dielectric barrier discharge-type ozone generator. The LCLC resonant network is used for realizing secondary resonant step-up. The dielectric barrier discharge-type ozone generator power supply has the advantages of simple circuit, high efficiency, small size and low cost. As no intermediate-frequency or high-frequency step-up transformer exists in the power supply, problems that the loss of the transformer is large, magnetic saturation is likely to happen to the transformer, the size of the power supply is large and the like as the conventional dielectric barrier discharge-type ozone generator power supply is used can be well overcome, and ...

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30-07-2014 дата публикации

Micro power source capacity configuring method based on power generation capability evaluation and load classification

Номер: CN103955765A
Принадлежит:

The invention discloses a micro power source capacity configuring method based on power generation capability evaluation and load classification. Micro power sources of the method include wind energy, solar energy, a storage battery and other types of micro power sources including a fuel machine. The micro power source capacity configuring method is characterized in that constraint conditions of micro power source output power and environmental parameters are established according to wind force and solar energy resource evaluation data of a micro power grid construction field, meanwhile, classification setting of loads is finished according to power demand features of the loads of a micro power grid, wherein the powder demand features are provided by a user, an evaluation system of load significance is established, and on the basis, micro power source capacity configuring schemes suitable for being set under a micro power grid framework and for the user to select are generated. According ...

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