Small-size wind generating set with power tracking analysis

The invention relates to a wind generating device, in particular to a small-size wind generating set with power tracking analysis. A grid-connected inverter of the generating set is provided with a power tracking device which averages the instantaneous power of a dynamic fluctuation and carries out voltage-stabilizing control in a way of stabilizing rectification voltage output by a draught fan; through the average calculation of power, the rectification voltage output by the draught fan is controlled by a stepped way to a draught fan generating set by sequentially adopting a PI controller and a PWM generator; sampled data return to the PI controller after power tracking calculation, wherein the calculation method is set in a way that voltage corresponds to power, and the current power value is as follows: when a sample reaches an M+1 point, P(1)=P(M+1), thus one circulation is carried out. When the wind speed is rapidly increased, power can be output as much as possible; and when the wind ...

Method and device for processing lactide refined raffinate

The invention relates to a method for processing lactide refined raffinate and a processing device adopting the same. The method comprises the following steps of: (1) heating and flashing lactide refined raffinate to remove heavy components containing oligomers in the refined raffinate, thereby obtaining flashing steam; (2) condensing the flashing steam to obtain a flashing condensate; (3) extracting the flashing condensate by using water as an extractant to make m-lactide blend in a liquid phase and separate out L-lactide as a solid phase, thereby forming a solid and liquid-phase system; and (4) separating the solid and liquid-phase system to obtain a wet filter cake and filtrate. The processing device comprises a flashing device, a condensation, an extraction device, a solid-liquid separation device and a melting device which are connected mutually. The invention has the advantages of reasonable process, simple device and flexible operation mode, effectively realizes the yield separation ...

Universal independent data acquisition method

The invention provides a universal autonomous data collection method which comprises that: (1) the configuration information of a collection base of a core database table and the detailed information of the collection base are established; (2) the management department sets a structure of the collection base; (3) a collection template is generated for the collection base; (4) a Web template is created for the collection base; (5) a Word template is created for the collection base. After the method of the invention is adopted, the management department can simply self-collect the data by autonomously setting the structures of various collection data, Excel templates and Word templates as well as the Web templates needed by the various collections through the interface of the application, and does not need to redevelop a new collection software to realize the expected functions.

Method for obtaining length variable interactivity identifying code based on Ajax

The utility model provides a Ajax-based method for obtaining the lengthened interactivity identifying code. The user needs to fill out the identifying code page, the identifying code length of the system initiation and other information; when preparing for filling in the identifying code, the system will produce two-bit identifying code; As each identifying code is inputted, the system will produce the next identifying code, so that the existing identifying code is shifted to the left for one bit. Meanwhile, the identifying code to be produced will be added. Then, the user submits the identifying code to the page. The utility model is characterized in that as filling in the identifying code page, the total length of the identifying code is random within a certain scope, so that the lengthof the identifying code is different as logging onto the page at different period of time. Each identifying code is produced according to the user's input instead of displayed on the page once a time. In ...

Lightweight individualized search engine and its searching method

The utility model provides a lightweight personalized search engine and a search method of the search engine, which comprises an information grasp module, an information retrieval module and a user personality analysis module though connection with each other; wherein, the information grasp module comprises a grasp program and an index program; the Internet information resource and the Web database can be accessed into the information grasp module; the user personality analysis module is connected with the output of the information grasp module; the record of user interest and keywords query are input into the information retrieval module which is combined with the user personality analysis module to provide personalized retrieval service. The utility model has a server without increased memory cost, making full use of the resources of the client to fulfill personalized search. The utility model provides a personalized search engine proposal to satisfy the interest of users according to ...

Individualized search engine searching method

Thrust auxiliary reamer bit

The invention relates to a thrust auxiliary reamer bit which comprises a drill rod (1), a multi-blade reamer (2) which is connected to a forcing device (4) and a cylinder (5) to form a whole, and a drill bit (3), all the parts being connected in sequence. The invention is characterized in that the forcing device (4) is a fluid piston type and formed by the cylinder (5), a piston (6) and a piston rod (1) arranged in the cylinder, the piston (6) is fixed on one end of the piston rod (7), the other end projects the cylinder (5) and fixes a taper forcing head (10); an air channel is arranged in a wall of the cylinder, an upper chamber air inlet/exhaust hole (11) at one end of the air channel is through in the piston chamber, an open at the other end is communicated with a Cornish bit wing air passage namely a drill rod air channel, a lower chamber air inlet hole (13) is arranged on the wall of the cylinder and is communicated with outside through the wall of the cylinder; and a reset spring ...

Method for obtaining length variable interactivity identifying code based on Ajax

The utility model provides a Ajax-based method for obtaining the lengthened interactivity identifying code. The user needs to fill out the identifying code page, the identifying code length of the system initiation and other information; when preparing for filling in the identifying code, the system will produce two-bit identifying code; As each identifying code is inputted, the system will produce the next identifying code, so that the existing identifying code is shifted to the left for one bit. Meanwhile, the identifying code to be produced will be added. Then, the user submits the identifying code to the page. The utility model is characterized in that as filling in the identifying code page, the total length of the identifying code is random within a certain scope, so that the length of the identifying code is different as logging onto the page at different period of time. Each identifying code is produced according to the user's input instead of displayed on the page once a time.

Pid effect suppression system

The present disclosure provides a PID (Potential Induced Degradation) effect suppression system. The PID effect suppression system includes a photovoltaic system, at least one voltage source topology module and a balanced circuit. The photovoltaic system is connected with a power grid. An output end of the voltage source topology module is connected with busbar neutral points of the photovoltaic system. A common earth end of the voltage source topology module is earthed, and then the potential to earth of a photovoltaic panel group in the photovoltaic system is improved through the suppression voltage output by the voltage source topology module, and the suppression voltage is greater than 1/2 of the output voltage of the photovoltaic panel group. Therefore, a PID effect of the photovoltaic system in operation can be effectively suppressed. When the voltage source topology module gets power from busbars, the balanced circuit can be connected between the output end of the voltage source topology module and the common earth end. If deviation occurs on the busbar voltage of the photovoltaic system, the balanced circuit is connected with the voltage source topology module, so that the deviation voltage generated by the busbars can be effectively balanced to ensure normal operation of the photovoltaic system under the suppression of the PID effect.

Energy storage system control method, device and energy storage system

The present invention provides an energy storage system control method, device, and energy storage system, which relate to the technical field of photovoltaic. The energy storage system control method according to the present invention includes: acquiring a PV voltage, a battery voltage and a grid-side voltage, determining a bus voltage reference value according to the PV voltage, the battery voltage and the grid-side voltage, and determining a phase shifting angle reference or a frequency reference according to the bus voltage reference value; acquiring a current on battery side, and determining a bridge arm phase shifting angle change amount or frequency change amount according to a low-frequency component of the current on battery side needing to be suppressed; determining a bridge arm phase shifting angle according to the phase shifting angle reference and the bridge arm phase shifting angle change amount, or determining a switching frequency according to the frequency reference and the change amount of the frequency; and suppressing low-frequency ripple according to the bridge arm phase shifting angle or the switching frequency. A phase shifting mode or a frequency modulation mode is used to suppress low-frequency ripple, and then the low-frequency ripple can be suppressed; so that the PV is at the MPPT point, the photovoltaic derating operation is effectively avoided. Acquire a PV voltage, a battery voltage, and a voltage on line side, determine a bus voltage reference value according to the PV voltage, the battery voltage, and the voltage on line side, and determine a reference phase-shifting angle or a reference frequency according to the bus voltage reference value Acquire a current on battery side, and determine a bridge arm phase-shifting angle change amount or frequency change amount according to a low-frequency component of the current on battery side needing to be suppressed Determine abridge arm phase shifting angle according to the reference phase- ...

System zur Unterdrückung des PID-Effekts

Die vorliegende Anmeldung offenbart ein System zur Unterdrückung des PID-Effekts, umfassend ein photovoltaisches System, mindestens ein Spannungsquellen-Topologiemodul und eine Ausgleichsschaltung; wobei das photovoltaische System mit dem Stromnetz verbunden ist, und wobei ein Ausgabeende des Spannungsquellen-Topologiemoduls mit einem Mittelpunkt eines Busses des photovoltaischen Systems verbunden ist, und wobei ein gemeinsames Erdungsende des Spannungsquellen-Topologiemoduls geerdet ist, um durch eine Unterdrückungsspannung, die von dem Spannungsquellen-Topologiemodul ausgegeben wird, das Erdpotential der Photovoltaikpaneelgruppe im photovoltaischen System zu erhöhen; und wobei die Unterdrückungsspannung 1/2 der Ausgangsspannung der Photovoltaikpaneelgruppe überschreitet; auf die Weise kann der PID-Effekt, der in Betrieb des photovoltaischen Systems erzeugt wird, wirksam unterdrückt werden. Wenn das Spannungsquellen-Topologiemodul Strom von dem Bus entnimmt, ist die Ausgleichsschaltung leitend zwischen dem Ausgangsende des Spannungsquellen-Topologiemoduls und dem gemeinsamen Erdungsende verbunden, wenn die Spannung des Busses des photovoltaischen Systems abweicht, ist die Ausgleichsschaltung mit dem Spannungsquellen-Topologiemodul leitend verbunden, um die von dem Bus erzeugte Abweichungsspannung wirksam auszugleichen, auf die Weise kann ein normaler Betrieb des photovoltaischen Systems bei einem unterdrückten PID-Effekt gewährleistet werden.

Leakage current suppression method for string-type photovoltaic system

The present application discloses a leakage current suppression method for a string-type photovoltaic system, comprising the following steps: S100, inputting synchronous carriers to a plurality of inverters connected in parallel and included in a photovoltaic system; S200, performing carrier modulation on the plurality of inverters; and S300, controlling the on-off states of the inverters according to a carrier modulation result, and then dislocating the common-mode components of the inverters, so that some of the common-mode components of the inverters are offset by each other, thereby reducing the potential change amount of the common-mode components outputted by the photovoltaic system. The present application has the following beneficial effects: the leakage current suppression mode of the present application is pure software optimization, so that the cost is low, and the implementation mode is simple. The potential change amount of the common-mode components outputted by the photovoltaic system is reduced by optimizing an on-off state action sequence of each inverter, so that the suppression of the leakage current is realized.

Verfahren zur Unterdrückung von Leckstrom in einem photovoltaischen Strangsystem

Die vorliegende Anmeldung offenbart ein Verfahren zur Unterdrückung von Leckstrom in einem photovoltaischen Strangsystem, umfassend die folgenden Schritte:S 100: Einspeisen eines Synchronträgers in mehrere parallel geschaltete Wechselrichter, die in dem photovoltaischen System enthalten sind;S200: Modulieren des Trägers für die mehreren Wechselrichter;S300: Steuern des Schaltzustandes jedes der Wechselrichter entsprechend dem Ergebnis der Trägermodulation, wodurch die von jedem der Wechselrichter ausgegebenen Gleichtaktkomponenten versetzt werden, um zu bewirken, dass sich einige der Gleichtaktkomponenten jedes der Wechselrichter gegenseitig aufheben, wodurch der Betrag der Potenzialänderung der von dem photovoltaischen System ausgegebenen Gleichtaktkomponenten verringert wird. Die vorliegende Anmeldung hat folgende Vorteile: das Verfahren zur Unterdrückung des Leckstroms in der vorliegenden Anmeldung ist eine reine Softwareoptimierung, die kostengünstig und einfach zu implementieren ist; durch die Optimierung der Wirkungssequenz des Schaltzustandes jedes Wechselrichters wird der Betrag der Potenzialänderung der von dem photovoltaischen System ausgegebenen Gleichtaktkomponenten reduziert, um die Unterdrückung des Leckstroms zu realisieren.

Steuerungsverfahren und -vorrichtung für Energiespeichersystem und Energiespeichersystem

Die vorliegende Erfindung stellt ein Steuerungsverfahren sowie eine Steuerungsvorrichtung für das Energiespeichersystem und ein Energiespeichersystem zur Verfügung und betrifft das technische Gebiet der Photovoltaik. Das Steuerungsverfahren der vorliegenden Erfindung umfasst: Erfassen einer PV-Spannung, einer Batteriespannung und einer netzseitigen Spannung. Bestimmen des Referenzwertes einer Busspannung auf der Grundlage der PV-Spannung, der Batteriespannung und der netzseitigen Spannung, und Bestimmen eines Referenz-Phasenverschiebungswinkels oder einer Referenzfrequenz auf der Grundlage des Referenzwertes einer Busspannung; Erfassen des batterieseitigen Stroms. Bestimmen eines Brückenarm-Phasenverschiebungswinkel-Änderungsbetrags oder eines Frequenzänderungs- betrags auf der Grundlage einer Niederfrequenzkomponente des zu unterdrückenden batterieseitigen Stroms; Bestimmen eines Brückenarm- Phasenverschiebungswinkels auf der Grundlage des Referenz-Phasenverschiebungswinkels und des Brückenarm- Phasenverschiebungswinkel-Änderungsbetrags, oder Bestimmen einer Schaltfrequenz auf der Grundlage der Referenzfrequenz und des Frequenzänderungsbetrags; Unterdrücken niederfrequenter Wellen auf der Grundlage des Brückenarm- Phasenverschiebungswinkels oder der Schaltfrequenz. Die Anwendung der Phasenverschiebungs- oder Frequenzmodulationsmethode zur Unterdrückung der niederfrequenten Wellen, die wiederum die niederfrequenten Wellen unterdrücken kann, wodurch die PV-Anlage den MPPT-Punkt erreicht und den PV-Derating-Betrieb effektiv vermieden wird.

Overload operating method for t-type 3-level converters

The present disclosure discloses a T-shaped three-level overload operating system, including a three-level topology and an overload mode switching system. The topology is connected with a first device group and a second device group which form a T shape; the first device group is designed with an overload capacity, and the second device group is designed with a rated capacity; and the overload mode switching system is configured for being connected to the topology to control the first device group to perform overload two-level operation on the topology, or to control the second device group to perform normal three-level operation on the topology, so that the number of device groups of the overload design can be effectively reduced, and then the cost of the system can be reduced. A working method of the T-shaped three-level overload operating system is further disclosed. The topology can be rapidly switched among working modes according to an output current of the topology.

可調式燈具組

Bicycle with air reservoir

Overload operating method for T-type 3-level converters

The present disclosure discloses a T-shaped three-level overload operating system, including a three-level topology and an overload mode switching system. The topology is connected with a first device group and a second device group which form a T shape; the first device group is designed with an overload capacity, and the second device group is designed with a rated capacity; and the overload mode switching system is configured for being connected to the topology to control the first device group to perform overload two-level operation on the topology, or to control the second device group to perform normal three-level operation on the topology, so that the number of device groups of the overload design can be effectively reduced, and then the cost of the system can be reduced. A working method of the T-shaped three-level overload operating system is further disclosed. The topology can be rapidly switched among working modes according to an output current of the topology.