CN104518520A - Control method and device of renewable energy driven generating unit - Google Patents

Control method and device of renewable energy driven generating unit Download PDF

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Publication number
CN104518520A
CN104518520A CN201310461980.0A CN201310461980A CN104518520A CN 104518520 A CN104518520 A CN 104518520A CN 201310461980 A CN201310461980 A CN 201310461980A CN 104518520 A CN104518520 A CN 104518520A
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China
Prior art keywords
value
generator unit
power
voltage
active power
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CN201310461980.0A
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Chinese (zh)
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CN104518520B (en
Inventor
廖华
李晶
张京伟
其他发明人请求不公开姓名
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Siemens AG
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Siemens AG
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • H02J3/382Dispersed generators the generators exploiting renewable energy
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • H02J3/382Dispersed generators the generators exploiting renewable energy
    • H02J3/383Solar energy, e.g. photovoltaic energy
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • H02J3/382Dispersed generators the generators exploiting renewable energy
    • H02J3/386Wind energy
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/76Power conversion electric or electronic aspects

Abstract

The invention provides a power control method of a renewable energy driven generating unit in a power grid. The method includes: according to an available capacity value, a generating efficiency curve, a current active power value and a current reactive power value of an energy storage device in the generating unit, voltage amplitude of the power grid, and frequency of the power grid, performing calculation to obtain an active power reference value and a reactive power reference value of the generating unit; according to a frequency rated value, an active power rated value of the generating unit, a current active power value of the generating unit, and an active power reference value of the generating unit, performing calculation to obtain a speed reference value or a torque reference value; meanwhile, according to a voltage rated value, the reactive power rated value of the generating unit, the current reactive power value of the generating unit and the reactive power reference value of the generating unit, performing calculation to obtain a voltage reference value. By the use of the method, the generating unit runs efficiently and outputs power stably.

Description

The control method of the generator unit that regenerative resource drives and device
Technical field
The present invention relates to electric power system, Electric Drive and automatic control technology field, the generator unit that in a kind of electrical network of specific design, regenerative resource drives and Poewr control method thereof.
Background technology
Along with the energy is more and more in short supply, in current electric grid, more and more comprise the branch road utilizing the renewable energy power generation such as wind energy, solar energy.Micro-capacitance sensor is a kind of small power generation, distribution and using electricity system of forming primarily of distributed generation unit and load.Micro-capacitance sensor can teaching display stand control, self-protection and self-management, can be incorporated into the power networks with external electrical network, also can isolated operation.The mode that generator unit in micro-capacitance sensor obtains energy has polytype, the batch (-type) such as wind energy, solar energy regenerative resource can be adopted to drive, the traditional energy such as coal, water power can also be adopted to drive.Because the intermittent energy such as wind energy and solar energy is larger by the impact of time, weather and environment, cause intermittent energy power output instability, fluctuation strong, in order to ensure that micro-capacitance sensor safely and steadily runs, need voltage and the frequency of the generator unit stable output made in micro-capacitance sensor, thus the reactive power of stable output and active power.
Chinese patent publication No. CN102244498A discloses the generator unit in a kind of micro-capacitance sensor, comprise energy capture equipment, charge controller, energy storage module, generator unit driver, alternating current motor and synchronous generator, arrive the object regulating generator unit active power of output by the rotating speed of regulating and controlling motor and synchronous generator, by the exciting voltage of regulating and controlling synchronous generator, ensure the voltage stabilization of micro-capacitance sensor.
In the micro-capacitance sensor of reality, micro-capacitance sensor generally comprises one or more generator unit branch road, therefore need this one or more generator unit branch road to be in operation and make micro-capacitance sensor while guarantee supply of electric power, its voltage and frequency can keep stable, and can take into account and make that micro-capacitance sensor overall operation efficiency is the highest or loss is minimum.
Summary of the invention
For achieving the above object, one embodiment of the present of invention propose the Poewr control method of the generator unit driven by regenerative resource in a kind of electrical network, comprise the steps:
A the current active power value of the active volume value of the energy storage device in () foundation generator unit, the generating efficiency curve of generator unit, generator unit, the current reactive power value of generator unit, the voltage magnitude of electrical network and the frequency computation part of electrical network obtain active power reference value and the reactive power reference qref of generator unit;
B () calculates speed reference or torque reference value according to frequency rated value, the active power rated value of generator unit, the current active power value of generator unit and active power reference value, and the rotating speed of synchronous generator in described generator unit is regulated according to described speed reference or torque reference value, calculate voltage reference value according to voltage rating, the reactive power rated value of generator unit, the current reactive power value of generator unit and reactive power reference qref simultaneously, and regulate the output voltage amplitude of described synchronous generator according to described voltage reference value.
The control method of generator unit of the present invention, the active power of control generator unit that can be independent exports and reactive power exports, and can make active power and the reactive power stable output of generator unit.
Preferably, in step (b), the active volume calculation of initial value also comprising the foundation magnitude of voltage of energy storage device, the current value of energy storage device and energy storage device obtains the present available capacity value of energy storage device.
Preferably, in step (b), deviation according to the active power rated value of generator unit and the current active power value of generator unit obtains an exemplary frequency deviation values, deviation according to the active power reference value received and active power rated value obtains secondary exemplary frequency deviation values, and frequency rated value and the exemplary frequency deviation values obtained and secondary exemplary frequency deviation values are obtained speed reference or torque reference value by read group total; Deviation simultaneously according to the reactive power rated value of generator unit and the current reactive power value of generator unit obtains the first voltage deviation value, deviation according to the reactive power reference qref received and reactive power rated value obtains the second voltage deviation value, and voltage rating and the first voltage deviation value obtained and the second voltage deviation value are obtained voltage reference value by read group total.
Preferably, in step (a)., according to described energy storage device present available capacity value and receive the power output predicted value of the energy acquiring device in electrical network, calculated active power higher limit and the active power lower limit of described generator unit by power output amplitude limit; The maximum target function of described operation of power networks efficiency is generated according to the active power higher limit of described generator unit and the generating efficiency curve of active power lower limit and generator unit, or when described electrical network also comprises conventional electric power generation branch road, generate the maximum target function of described operation of power networks efficiency according to the active power higher limit of described generator unit and active power lower limit, the generating efficiency curve of generator unit and the generating efficiency curve of described conventional electric power generation branch road.Preferred, according to the predicted load in the current reactive power value of the current active power value of generator unit, generator unit, the voltage magnitude of electrical network and the frequency of electrical network and electrical network, active power reference value and the reactive power reference qref of generator unit can be obtained based on the target function that described operation of power networks efficiency is maximum.Can pass through multiple existing algorithm, such as genetic algorithm, neural network algorithm and FUZZY ALGORITHMS FOR CONTROL etc., obtain active power reference value and reactive power reference qref.Thus make the operational efficiency of generator unit the highest, or loss is minimum.
One embodiment of the present of invention additionally provide the control device of the generator unit that regenerative resource drives in a kind of micro-capacitance sensor, this control device comprises central controller, and it is for obtaining active power reference value and the reactive power reference qref of generator unit according to the current reactive power value of the current active power value of the generating efficiency curve of the active volume value of the energy storage device in generator unit, generator unit, generator unit, generator unit, the voltage magnitude of electrical network and the frequency computation part of electrical network;
Described cell controller is used for calculating speed reference or torque reference value according to frequency rated value, the active power rated value of generator unit, the current active power value of generator unit and described active power reference value, and export described speed reference or torque reference value to regulate the rotating speed of the synchronous generator in described generator unit, calculate voltage reference value according to voltage rating, the reactive power rated value of generator unit, the current reactive power value of generator unit and described reactive power reference qref simultaneously.
Control device of the present invention can be independent the active power of control generator unit export and reactive power output, and active power and the reactive power stable output of generator unit can be made.
Preferably, described cell controller comprises: active volume computing module, obtains the present available capacity value of energy storage device for the active volume calculation of initial value according to the magnitude of voltage of energy storage device, the current value of energy storage device and energy storage device and exports described central controller to; Frequency droop module, for obtaining an exemplary frequency deviation values according to the deviation of the active power rated value of generator unit and the current active power value of generator unit; Secondary frequency adjustment module, for obtaining secondary exemplary frequency deviation values according to the deviation of the active power reference value received and active power rated value; Frequency summation module, for obtaining speed reference by frequency rated value and the exemplary frequency deviation values obtained and secondary exemplary frequency deviation values by read group total; The sagging module of voltage, for obtaining the first voltage deviation value according to the deviation of the reactive power rated value of generator unit and the current reactive power value of generator unit; Reactive Power Control module, for obtaining the second voltage deviation value according to the deviation of the reactive power reference qref received and reactive power rated value; And voltage summation module, for voltage rating and the first voltage deviation value obtained and the second voltage deviation value are obtained voltage reference value by read group total.
Preferably, described central controller comprises: generator unit power output amplitude limit computing module, for calculating active power higher limit and the active power lower limit of described generator unit according to the power output predicted value of energy acquiring device in the electrical network received and the present available capacity value of described energy storage device by power output amplitude limit; And target function generation module, for generating the maximum target function of described operation of power networks efficiency according to the active power higher limit of described generator unit and the generating efficiency curve of active power lower limit and generator unit, or when described electrical network also comprises conventional electric power generation branch road, for generating the maximum target function of described operation of power networks efficiency according to the active power higher limit of described generator unit and active power lower limit, the generating efficiency curve of generator unit and the generating efficiency curve of described conventional electric power generation branch road.
Preferably, described central controller also comprises generator unit operational efficiency and optimizes computing module, for the predicted load in the electrical network according to the current reactive power value of the current active power value of generator unit, generator unit, the voltage magnitude of electrical network and the frequency of electrical network and reception, obtain active power reference value and the reactive power reference qref of generator unit based on the target function that described operation of power networks efficiency is maximum.Such as can pass through genetic algorithm, neural network algorithm and FUZZY ALGORITHMS FOR CONTROL obtain active power reference value and reactive power reference qref.The highest loss in other words of the operational efficiency of generator unit can be made minimum.
Preferably, described generator unit also comprises a generator unit branch road, and described generator unit branch road comprises:
Energy input branch road, comprise one or more energy acquiring device, for obtaining intermittent energy and described intermittent energy being converted to direct current, the output of described energy acquiring device is connected to DC bus;
Energy transmission branch road, described Energy transmission branch road comprises:
Driver, one end of described driver is connected with described DC bus;
Motor, the other end of described driver is connected with one end of described motor and drives described motor running;
Synchronous generator, the other end of described motor is connected with one end of described synchronous generator and drags the generating of described synchronous generator, and the output of described synchronous generator is connected to the common connecting point of described electrical network;
Excitation system, provides exciting voltage for giving described synchronous generator;
Two-way DC/DC converter, one end of described two-way DC/DC converter is connected with described DC bus;
Energy storage device, described energy storage device is connected with the other end of described two-way DC/DC converter;
First checkout gear, for obtaining the current active power value of described synchronous generator and current reactive power value according to the output voltage of described synchronous generator and output current measurement, and export the current active power value of described synchronous generator and current reactive power value to described cell controller;
Second detection device, for obtaining the voltage magnitude of described electrical network and the frequency of electrical network according to the output voltage measurement of described electrical network, and by the rate-adaptive pacemaker of the voltage magnitude of electrical network and electrical network to described central controller.
The driver of generator unit of the present invention is according to the rotating speed of speed reference control synchronization generator, and the synchronous generator excited system in generator unit is according to the voltage of the output of voltage reference value control synchronization generator.
Preferably, described cell controller is integrated in described driver or described two-way DC/DC converter.
Preferably, described generator unit also comprises one or more generator unit branch road.The active power of synchronous generator can be regulated respectively to export for multiple generator unit branch road and reactive power exports, and under the active power and reactive power stable output of generator unit, the overall operation efficiency of generator unit can also be made high.
Preferably, described generator unit also comprises one or more energy input branch road and inputs the corresponding one or more Energy transmission branch roads of branch road with described one or more energy.
Preferably, described driver is DC/AC driver, and described motor is alternating current motor, and described synchronous generator is synchronous alternating-current generator, and described excitation system is synchronous generator excited system.
Preferably, described Energy transmission branch road also comprises DC motor excitation system, described driver is DC/DC driver, described motor is DC motor, described synchronous generator is synchronous alternating-current generator, described excitation system is synchronous generator excited system, and described DC motor excitation system is connected with described DC motor.
Preferably, described generator unit also comprises one or more generator unit branch road.
Preferably, described generator unit also comprises one or more energy input branch road and inputs the corresponding one or more Energy transmission branch roads of branch road with described one or more energy.
Accompanying drawing explanation
The following drawings is only intended to schematically illustrate the present invention and explain, not delimit the scope of the invention.Wherein,
Fig. 1 is the structural representation of the generator unit in the micro-capacitance sensor of first embodiment of the invention.
Fig. 2 is the structural representation of the central controller in Fig. 1.
Fig. 3 is the structural representation of the generator unit in the micro-capacitance sensor of second embodiment of the invention.
Fig. 4 is the structural representation of the central controller in Fig. 3.
Fig. 5 is the structural representation of the generator unit in the micro-capacitance sensor of third embodiment of the invention.
Fig. 6 is the structural representation of the generator unit in the micro-capacitance sensor of four embodiment of the invention.
Main device symbol description
1 photovoltaic cell 2 DC/DC converter
3 wind energy plant 4 AC/DC converters
5 DC bus 6 DC/AC drivers
7 alternating current motor 8 synchronous alternating-current generators
The two-way DC/DC converter of 9 synchronous generator excited system 10
11 energy-storage battery 12 ammeters
13 ammeter 14 central controllers
The sagging module of 15 cell controller 16 voltage
17 Reactive Power Control module 18 frequency droop modules
19 2 frequency adjustment module 20 state-of-charge computing modules
21 voltage summation module 22 frequency summation modules
23 energy acquiring device 24 energy acquiring devices
25 generator unit branch road 26 generator unit branch roads
27 Energy transmission branch road 28 Energy transmission branch roads
29 DC/DC driver 30 DC motor
31 synchronous alternating-current generator 32 synchronous generator excited systems
33 DC motor excitation system 34 energy acquiring devices
35 wind energy plant 36 AC/DC converters
37 photovoltaic cell 38 DC/DC converters
39 energy acquiring device 40 DC buss
41 two-way DC/DC converter 42 energy-storage batteries
43 DC/AC driver 44 alternating current motors
45 synchronous alternating-current generator 46 synchronous generator excited systems
47 table table 48 ammeters
49 cell controller 50 DC/AC drivers
51 alternating current motor 52 synchronous alternating-current generators
53 synchronous generator excited system 54 ammeters
55 ammeter 56 cell controllers
141 generator unit power output limiting technology module 142 target function generation modules
143 generator unit operational efficiency optimisation technique module 242 target function generation modules
241 first and second generator unit branch road power output limiting technology modules
243 generator unit operational efficiency optimize computing module
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and the specific embodiment of the present invention is described.
Fig. 1 is the structural representation of the generator unit in the micro-capacitance sensor of first embodiment of the invention.As shown in Figure 1, energy acquiring device 23, energy acquiring device 24, DC/AC driver 6, alternating current motor 7, synchronous alternating-current generator 8, synchronous generator excited system 9, ammeter 12, ammeter 13, two-way DC/DC converter 10, energy-storage battery 11, cell controller 15 and central controller 14 is comprised.Energy acquiring device 23 comprises photovoltaic cell 1 and DC/DC converter 2, solar energy is converted to electric energy by photovoltaic cell 1, the direct current produced is by outputting on DC bus 5 after DC/DC converter 2, energy acquiring device 24 comprises wind energy plant 3 and AC/DC converter 4, Wind resource change is electric energy by wind energy plant 3, the alternating current produced is by outputting on DC bus 5 after AC/DC converter 4, in the present embodiment, photovoltaic cell 1 and wind energy plant 3 are intermittent energy, in other examples, other forms of intermittent energy or regenerative resource can also be adopted.Energy acquiring device 23 and energy acquiring device 24 constitute an energy input branch road.One end of two-way DC/DC converter 10 is connected to DC bus 5; the other end of two-way DC/DC converter 10 is connected to energy-storage battery 11; two-way DC/DC converter 10 can utilize the electric energy on DC bus 5 to charge to energy-storage battery 11 according to the magnitude of voltage of setting; also electrical energy discharge in energy-storage battery 11 can be made on DC bus 5; two-way DC/DC converter 10 is except making voltage on DC bus 5 keep and stablizing; the electric discharge that energy-storage battery 11 can also be prevented excessive or excessive charging, protect energy-storage battery 11.One end of DC/AC driver 6 is connected on DC bus 5, the other end of DC/AC driver 6 is connected with one end of alternating current motor 7 and drags alternating current motor 7 and runs, the other end of alternating current motor 7 is connected with one end of synchronous alternating-current generator 8 and drags synchronous alternating-current generator 8 and generates electricity, synchronous generator excited system 9 is connected with synchronous alternating-current generator 8, and provide exciting voltage to synchronous alternating-current generator 8, the output of synchronous alternating-current generator 8 is electrically connected on the common connecting point PCC of micro-capacitance sensor, wherein DC/AC driver 6, alternating current motor 7, synchronous alternating-current generator 8 and synchronous generator excited system 9 constitute the Energy transmission branch road of the present embodiment.Ammeter 12 obtains the current active power value P of synchronous alternating-current generator 8 and current reactive power value Q by the voltage v on the output of collection synchronous alternating-current generator 8 and current i.Ammeter 13 calculates the voltage magnitude of micro-capacitance sensor by the voltage v gathered on the common connecting point PCC of micro-capacitance sensor | V| and frequency f.In the present embodiment, the output of a synchronous alternating-current generator 8 is only had to be connected on the common connecting point PCC of micro-capacitance sensor in micro-capacitance sensor, therefore current active power value P, current reactive power value Q, the voltage magnitude of synchronous alternating-current generator 8 | the current active power value P of V| and frequency f and micro-capacitance sensor, current reactive power value Q, voltage magnitude | V| and frequency f.
Cell controller 15 comprises the sagging module 16 of voltage, Reactive Power Control module 17, voltage summation module 21, frequency droop module 18, secondary frequency adjustment module 19, frequency summation module 22 and state-of-charge computing module 20, and wherein state-of-charge computing module 20 receives the voltage V in energy-storage battery 11 band electric current I bsignal (for improving computational accuracy, also can increase and gathering the temperature signal of energy-storage battery), and state-of-charge initial value thus calculate the current SOC SOC of energy-storage battery 11, and this current SOC SOC is outputted to central controller 14.Central controller 14 receives current active power value P that ammeter 12 exports and the micro-capacitance sensor voltage magnitude that current reactive power value Q, ammeter 13 export | and the current SOC SOC of V| and micro-capacitance sensor frequency f and energy-storage battery 11 is by calculating thus obtaining the active power reference value P of generator unit refwith reactive power reference qref Q ref, and the active power reference value P that will obtain refwith reactive power reference qref Q refexport secondary frequency adjustment module 19 and Reactive Power Control module 17 respectively to.The sagging module of voltage in cell controller 15 16 couples of reactive power rated value Q 0the first voltage deviation value Δ V is calculated with the deviation passing ratio of the current reactive power value Q of ammeter 12 output 1, Reactive Power Control module 17 couples of reactive power rated value Q 0with the reactive power reference qref Q that the central controller 14 received exports refthe deviation passing ratio of these two signals calculates the second voltage deviation value Δ V 2, the first voltage deviation signal that the sagging module 16 of voltage exports and the second voltage deviation signal that reactive power controller 17 exports output in voltage summation module 21 simultaneously, and voltage summation module 21 is according to the first voltage deviation value Δ V received 1, the second voltage deviation value Δ V 2with rated voltage V 0read group total obtains voltage reference value V ref, and by voltage reference value V refoutput to synchronous generator excited system 9, synchronous generator excited system 9 is according to voltage reference value V refthere is provided corresponding exciting voltage to synchronous alternating-current generator 8, synchronous alternating-current generator 8 and then output maintain micro-capacitance sensor and stablize required voltage, thus reach the object of the voltage regulating micro-capacitance sensor.In the present embodiment, the first voltage deviation value and the second voltage deviation value can also be obtained by computation of table lookup, namely the deviation of the sagging module of voltage 16 couples of reactive power rated value Q0 and current reactive power value Q obtains the first voltage deviation value Δ V1 by tabling look-up, and the deviation of these two signals of reactive power reference qref Qref that Reactive Power Control module 17 couples of reactive power rated value Q0 and central controller 14 export obtains the second voltage deviation value Δ V2 by tabling look-up.Synchronous generator of the present invention can adopt multiple control modes to control, in a kind of control mode of synchronous generator, the sagging module of such as voltage 16 is by the ratio design factor zero setting (or by checking result zero setting) of the deviation of reactive power rated value Q0 and current reactive power value Q thus make the first voltage deviation value Δ V1 be zero, simultaneously the ratio design factor zero setting (or by checking result zero setting) of the deviation of reactive power rated value Q0 and reactive power reference qref Qref is made the second voltage deviation value Δ V2 zero setting by Reactive Power Control module 17, now voltage reference value Vref equals rated voltage V0, thus the constant voltage achieving synchronous generator controls.In the another kind of control mode of synchronous generator, the sagging module of voltage 16 is by the ratio design factor zero setting (or by checking result zero setting) of the deviation of reactive power rated value Q0 and current reactive power value Q thus make the first voltage deviation value Δ V1 be zero, now voltage reference value Vref equals rated voltage V0 and adds the second voltage deviation value Δ V2, thus achieves synchronous generator constant power factor and control.The control mode of synchronous generator of the present invention is not limited to constant voltage and controls and constant power factor control, can also be that arbitrary non-constant voltage controls and non-constant power factor control mode.
The current active power value P of the frequency droop module 18 pairs of generator units in cell controller 15 and active power rated value P 0deviation carry out ratio and calculate an exemplary frequency deviation values Δ ω 1.Secondary frequency adjustment module 19 is according to active power rated value P simultaneously 0with the active power reference value P that central controller 14 exports refdeviation carry out ratio and calculate secondary frequency deviation ω 2, frequency summation module 22 receives an exemplary frequency deviation values Δ ω simultaneously 1, secondary exemplary frequency deviation values Δ ω 2with rated frequency ω 0these three signals, and the speed reference ω that read group total is obtained refexport the speed control (not shown) in DC/AC driver 6 to, DC/AC driver 6 is according to this frequency reference ω refregulate the rotating speed of alternating current motor 7, the final synchronous alternating-current generator 8 that regulates reaches required rotating speed, thus reaches the object of the frequency regulating micro-capacitance sensor.In other examples, frequency droop module 18 can also obtain an exemplary frequency deviation values Δ ω 1 to the current active power value P of generator unit and active power rated value P0 by tabling look-up.Secondary frequency adjustment module 19 also obtains secondary frequency deviation ω 2 according to active power rated value P0 and active power reference value Pref by tabling look-up simultaneously.
Fig. 2 is the structural representation of the central controller in Fig. 1.As shown in Figure 2, central controller 14 comprises generator unit power output amplitude limit computing module 141, target function generation module 142 and generator unit operational efficiency optimisation technique module 143.The power output predicted value of the current SOC SOC that generator unit power output amplitude limit computing module 141 receiving element controller 15 exports and energy acquiring device, by calculating active power higher limit and the active power lower limit of generator unit.Wherein the power output predicted value of energy acquiring device can be carried out prediction according to prior art and obtained, such as, obtained the power output predicted value of energy acquiring device by calculation of parameter such as the radiant energy of weather, wind-force, the sun.The generator unit efficiency curve that target function generation module 142 obtains according to manual measurement generates the maximum target function of micro-capacitance sensor operational efficiency, and wherein the active power higher limit of generator unit and active power lower limit are the boundary condition of the maximum target function of this micro-capacitance sensor operational efficiency.Generator unit operational efficiency optimisation technique module 143 is according to the predicted load received, the current active power value P of generator unit, the current reactive power value Q of generator unit, the voltage magnitude of micro-capacitance sensor | and the frequency f of V| and micro-capacitance sensor calculates the active power reference value P of generator unit based on the target function that micro-capacitance sensor operational efficiency is maximum refwith reactive power reference qref Q ref.And by this active power reference value P refwith reactive power reference qref Q refexport secondary frequency adjustment module 19 and Reactive Power Control module 17 respectively to.
When micro-capacitance sensor of the present invention comprises conventional electric power generation branch road, such as, when comprising hydroelectric power generation branch road and/or diesel generation branch road, target function generation module 142 generates the maximum target function of micro-capacitance sensor overall operation efficiency according to the generating efficiency curve of the generating efficiency curve of generator unit, the active power higher limit of generator unit and active power lower limit and conventional electric power generation branch road.
Those skilled in the art is known, on the basis of Poewr control method of the present invention, target function generation module can also generate the minimum target function of micro-capacitance sensor loss according to the active power higher limit of generator unit damage curve and generator unit and active power lower limit.
Cell controller 15 output speed reference value ω in the present embodiment refregulate alternating current motor 7 rotating speed to DC/AC driver 6 and then regulate the rotating speed of synchronous alternating-current generator 8, thus regulating the frequency of micro-capacitance sensor.Cell controller 15 is by voltage reference value V refexport synchronous generator excited system 9 to, thus regulate the output voltage of synchronous alternating-current generator 8, namely have adjusted the voltage of micro-capacitance sensor.Therefore, the frequency and voltage of the adjustment micro-capacitance sensor that generator unit of the present invention can be independent as required, thus make micro-capacitance sensor stablize active power of output and reactive power, micro-capacitance sensor operational efficiency can also be made the highest simultaneously.
In an embodiment of the present invention, just schematically list energy acquiring device 23 and energy acquiring device 24, in other embodiments, can according to the weather of locality and the one or more energy acquiring device of environmental selection, can all utilize solar energy or wind energy, solar energy and wind energy can also be utilized simultaneously.Ammeter 12 in the present embodiment and ammeter 13 can be the multifunction electric meters of same type, in other examples, ammeter 12 can be to measure arbitrarily the current active power value P of synchronous alternating-current generator 8 output and the measurement mechanism of current reactive power value Q, and same ammeter 13 can be to measure arbitrarily the voltage magnitude of micro-capacitance sensor and the measurement mechanism of frequency.Load voltage value in the present embodiment and rated frequency value are all fixed values.
Fig. 3 is the structural representation of the generator unit in the micro-capacitance sensor of second embodiment of the invention.As shown in Figure 3, generator unit and Fig. 1 are substantially identical, difference is to comprise two identical generator unit branch roads 25 and generator unit branch road 26, generator unit branch road 26 comprises energy acquiring device 34, energy acquiring device 39, two-way DC/DC converter 41, energy-storage battery 42, DC/AC driver 43, alternating current motor 44, synchronous alternating-current generator 45, synchronous generator excited system 46, ammeter 47, ammeter 48 and cell controller 49, energy acquiring device 34 comprises wind power generation 35 and AC/DC converter 36, energy acquiring device 39 comprises photovoltaic cell 37 and DC/DC converter 38, the output of energy acquiring device 34 and the output of energy acquiring device 39 are connected on DC bus 40, generator unit branch road 26 is identical with the structure of generator unit branch road 25, and it is identical with the structure of the generator unit shown in Fig. 1, do not repeat them here.In figure 3 in order to distinguish parameter in generator unit branch road 26 and generator unit branch road 25 and control signal, wherein V b1and V b2represent the voltage of energy-storage battery 11 and the voltage of energy-storage battery 42 respectively, I b1and I b2represent the electric current of energy-storage battery 11 and the electric current of energy-storage battery 42 respectively, P 1and Q 1for current active power value and the current reactive power value of generator unit branch road 25, P ref1and Q ref1for central controller 14 exports active power reference value and the reactive power reference qref of cell controller 15 to, ω ref1the speed reference that cell controller 15 exports DC/AC driver 6 to, V ref1the voltage reference value that cell controller 15 exports synchronous generator excited system 9 to, SOC 1it is the current SOC that cell controller 15 exports central controller 14 to.P 2and Q 2for current active power value and the current reactive power value of generator unit branch road 26, P ref2and Q ref2for central controller 14 exports active power reference value and the reactive power reference qref of cell controller 49 to, ω ref2the speed reference that cell controller 49 exports DC/AC driver 43 to, V ref2the voltage reference value that cell controller 49 exports synchronous generator excited system 46 to, SOC 2it is the current SOC that cell controller 49 exports central controller 14 to.
Fig. 4 is the structural representation of the central controller in Fig. 3.As shown in Figure 4, the first and second generator unit branch road power output amplitude limit computing modules 241 receive the current SOC SOC that the cell controller 15 in generator unit branch road 25 exports respectively 1, generator unit branch road 26 cell controller 49 export current SOC SOC 2with the power output predicted value of energy acquiring device 23, energy acquiring device 24 and energy acquiring device 34 and energy acquiring device 37, and by the active power higher limit of generator unit branch road 25 that calculates and active power lower limit, and the active power higher limit of generator unit branch road 26 and active power lower limit export target function generation module 242 to.Target function generation module 242 receives the efficiency curve of generator unit branch road 25 and the efficiency curve of generator unit branch road 26 simultaneously, by calculating the maximum target function of micro-capacitance sensor operational efficiency, in generation target function, can by directly the efficiency curve summation of the efficiency curve of generator unit branch road 25 and generator unit branch road 26 being obtained the maximum target function of this micro-capacitance sensor operational efficiency, be added again after the efficiency curve of the efficiency curve of generator unit branch road 25 and generator unit branch road 26 can certainly be made to be multiplied by respective weight coefficient respectively and obtain the maximum target function of micro-capacitance sensor operational efficiency.In the micro-capacitance sensor of reality runs, it is also conceivable to generator capacity and configuration, generator the parameter such as ruuning situation thus determine the weight coefficient of the weight coefficient of the efficiency curve of generator unit branch road 25 and the efficiency curve of generator unit branch road 26 respectively.Generator unit operational efficiency optimizes the current active power value P that computing module 243 receives generator unit branch road 25 1with current reactive power value Q 1, generator unit branch road 26 current active power value P 2with current reactive power value Q 2, micro-capacitance sensor voltage magnitude | the frequency f of V|, micro-capacitance sensor and predicted load, and the active power reference value P being obtained generator unit branch road 25 based on the maximum target function of micro-capacitance sensor operational efficiency by optimization algorithm (such as genetic algorithm, neural network algorithm or FUZZY ALGORITHMS FOR CONTROL etc.) respectively ref1with reactive power reference qref Q ref1, and the active power reference value P of generator unit branch road 26 ref2with reactive power reference qref Q ref2.Central controller 14 is by active power reference value P ref1with reactive power reference qref Q ref1export the cell controller 15 in generator unit 25 to, thus the active power value regulating synchronous alternating-current generator 8 to export and reactive power value, central controller 14 is by active power reference value P simultaneously ref2with reactive power reference qref Q ref2export the cell controller 49 in generator unit 26 to, thus the active power value regulating synchronous alternating-current generator 45 to export and reactive power value.The active power value P that therefore corresponding synchronous alternating-current generator can be regulated respectively to export by two cell controllers and reactive power value Q, therefore, it is possible to more flexibly and regulate the active power of micro-capacitance sensor and reactive power to export in wider scope.In other examples, the generator unit branch road of any amount can also be comprised.Energy acquiring device in generator unit branch road can be utilize wind power generation, can also be utilize solar power generation, can also be utilize wind energy and solar power generation simultaneously.
Fig. 5 is the structural representation of the generator unit in the micro-capacitance sensor of third embodiment of the invention.As shown in Figure 5, generator unit and Fig. 1 are substantially identical, difference is to comprise two identical Energy transmission branch roads, namely Energy transmission branch road 27 and Energy transmission branch road 28 is comprised, Energy transmission branch road 28 comprises DC/AC driver 50, alternating current motor 51, synchronous alternating-current generator 52, synchronous generator excited system 53, ammeter 54, ammeter 55 and cell controller 56, energy acquiring device 23 and energy acquiring device 24 are respectively as energy input branch road in addition, in the present embodiment, energy acquiring device 23 and energy acquiring device 24 can be interpreted as an energy input branch road, energy acquiring device 23 and energy acquiring device 24 can also be interpreted as two energy input branch roads.Energy transmission branch road 27 and Energy transmission branch road 28 share two-way DC/DC converter 10 and energy-storage battery 11, and the cell controller 15 in Energy transmission branch road 27 receives the voltage V of energy-storage battery 11 b, energy-storage battery 11 electric current I b, active power reference value P ref1, reactive power reference qref Q ref1, synchronous alternating-current generator 8 export current active power value P 1with current reactive power value Q 1, by calculating speed reference ω ref1export DC/AC driver 6 to, and by voltage reference value V ref1export synchronous generator excited system 9 to, thus the active power regulating synchronous alternating-current generator 8 to export and reactive power.Equally, the cell controller 56 in Energy transmission branch road 28 receives the voltage V of energy-storage battery 11 equally b, energy-storage battery 11 electric current I b, active power reference value P ref2, reactive power reference qref Q ref2, synchronous alternating-current generator 52 export current active power value P 2with current reactive power value Q 2, by calculating speed reference ω ref2export DC/AC driver 50 to, and by voltage reference value V ref2export synchronous generator excited system 53 to, thus the active power regulating synchronous alternating-current generator 52 to export and reactive power.Need it is noted that, because Energy transmission branch road 27 and Energy transmission branch road 28 share two-way DC/DC converter 10 and energy-storage battery 11, current state-of-charge (SOC) value of energy-storage battery can only calculate and export to central controller 14 in any one cell controller 15 or 56.In other control method, the speed reference ω that the cell controller 56 in Energy transmission branch road 28 exports ref2the speed reference ω that can export with the cell controller 15 in Energy transmission branch road 27 ref1identical or different, in addition, the voltage reference value V that the cell controller 56 in Energy transmission branch road 28 exports ref2the voltage reference value V that can export with the cell controller 15 in Energy transmission branch road 27 ref1identical or different.Two cell controllers in the present embodiment can both regulate corresponding synchronous alternating-current generator active power value and reactive power value respectively, thus make the adjustable range of the active power value of micro-capacitance sensor and reactive power value wider, regulate more flexible.In other examples, the Energy transmission branch road of arbitrary number can also be comprised.The parameters such as power consumption according to actual needs, time, natural environment and climate, generator unit can comprise one or more energy acquiring device.
State in the modified example of three embodiments on the invention, cell controller can be integrated in two-way DC/DC converter, cell controller can also be integrated in DC/AC driver.It is identical with above-mentioned three embodiments with the control method of reactive power to the active power of micro-capacitance sensor, does not repeat them here.
Fig. 6 is the structural representation of the generator unit in the micro-capacitance sensor of four embodiment of the invention.Itself and Fig. 1 are substantially identical, difference is, DC/DC driver 29 is adopted to substituted for DC/AC driver 6 in Fig. 1 in the present embodiment, employing DC motor 30 and the DC motor excitation system 33 be connected with DC motor 30 substituted for the alternating current motor 7 in Fig. 1, other are identical with Fig. 1, do not repeat them here.Cell controller 15 is by speed reference ω refexport DC/DC driver 29 to, and by voltage reference value V refexport the excitation system 32 of synchronous generator to, thus regulate active power and the reactive power of micro-capacitance sensor.Those skilled in the art can obtain other modified example on the basis of four embodiment of the invention, such as, generator unit can comprise multiple Energy transmission branch road, and each Energy transmission branch road comprises DC/DC driver, DC motor, DC motor excitation system, synchronous alternating-current generator, synchronous generator excited system, cell controller and two ammeters.Generator unit also can comprise multiple generator unit branch road.In four embodiment of the invention and modified example thereof, cell controller can be integrated in two-way DC/DC converter, cell controller can also be integrated in DC/DC driver.
Various improvement can be made to the micro-capacitance sensor of the above embodiment of the present invention, such as the DC/AC driver 43 in the embodiment of second shown in Fig. 3 and DC/AC driver 6 can be replaced with DC/DC driver simultaneously, alternating current motor 7 is replaced with DC motor and DC motor excitation system, alternating current motor 44 replaces with DC motor and DC motor excitation system simultaneously.Also the DC/AC driver 6 in the embodiment of the 3rd shown in Fig. 5 and DC/AC driver 50 can be replaced with DC/DC driver, alternating current motor 7 is replaced with DC motor and DC motor excitation system, alternating current motor 51 replaces with DC motor and DC motor excitation system simultaneously.
In the above-described embodiments, alternating current motor can also be provided with speed encoder, and this encoder is for detecting the rotating speed of alternating current motor, and output speed value of feedback signal is in DC/AC driver, thus the accurate rotating speed controlling alternating current motor.Equally, DC motor also can be provided with speed encoder, and this encoder is for detecting the rotating speed of DC motor, and output speed value of feedback signal is in DC/DC driver, thus the accurate rotating speed controlling DC motor.Those skilled in the art is known, the structure of encoder, and the position relationship of encoder and motor and annexation are known.In an embodiment of the present invention, state-of-charge computing module is by receiving the voltage and current of energy-storage battery, and state-of-charge initial value thus calculate current SOC.In order to improve the accuracy of calculating, the temperature that can also gather battery corrects result of calculation.Except directly reacting except the charged state of energy-storage battery with state-of-charge, depth of discharge value can also be adopted to react the discharge condition of energy-storage battery.Namely employing depth of discharge computing module replaces the state-of-charge computing module in above-described embodiment, this depth of discharge computing module is by gathering the voltage and current of energy-storage battery, and depth of discharge calculation of initial value obtains present discharge depth value, and export this current depth of discharge value to central controller.
Be to be understood that, although this specification describes according to each embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.
The foregoing is only the schematic embodiment of the present invention, and be not used to limit scope of the present invention.Any those skilled in the art, the equivalent variations done under the prerequisite not departing from design of the present invention and principle, amendment and combination, all should belong to the scope of protection of the invention.

Claims (10)

1. a Poewr control method for the generator unit driven by regenerative resource in electrical network, is characterized in that, comprises the following steps:
A () obtains active power reference value and the reactive power reference qref of generator unit according to the frequency computation part of the current active power value of the generating efficiency curve of the active volume value of energy storage device in generator unit, generator unit, generator unit, the current reactive power value of generator unit, the current voltage amplitude of electrical network and electrical network;
B () calculates speed reference or torque reference value according to frequency rated value, the active power rated value of generator unit, the current active power value of generator unit and active power reference value, and regulate the rotating speed of synchronous generator in described generator unit according to described speed reference or torque reference value; Simultaneously, calculate voltage reference value according to voltage rating, the reactive power rated value of generator unit, the current reactive power value of generator unit and reactive power reference qref, and regulate the output voltage amplitude of described synchronous generator according to described voltage reference value.
2. method according to claim 1, is characterized in that, in described step (b), also comprises the present available capacity value that the magnitude of voltage of foundation energy storage device, current value and active volume calculation of initial value obtain energy storage device.
3. method according to claim 1, is characterized in that, in described step (b),
Deviation according to the active power rated value of generator unit and the current active power value of generator unit obtains an exemplary frequency deviation values, deviation according to the active power reference value received and active power rated value obtains secondary exemplary frequency deviation values, and frequency rated value and the exemplary frequency deviation values obtained and secondary exemplary frequency deviation values are obtained speed reference or torque reference value by read group total; With
Deviation according to the reactive power rated value of generator unit and the current reactive power value of generator unit obtains the first voltage deviation value, deviation according to the reactive power reference qref received and reactive power rated value obtains the second voltage deviation value, and voltage rating and the first voltage deviation value obtained and the second voltage deviation value are obtained voltage reference value by read group total.
4. the method according to any one of claims 1 to 3, is characterized in that, in described step (a),
According to the power output predicted value obtaining the energy acquiring device of regenerative resource in the present available capacity value of described energy storage device and electrical network, calculated active power higher limit and the active power lower limit of described generator unit by power output amplitude limit;
The maximum target function of described operation of power networks efficiency is generated according to the active power higher limit of described generator unit and the generating efficiency curve of active power lower limit and generator unit, or when described electrical network also comprises conventional electric power generation branch road, generate the maximum target function of described operation of power networks efficiency according to the active power higher limit of described generator unit and active power lower limit, the generating efficiency curve of generator unit and the generating efficiency curve of described conventional electric power generation branch road.
5. method according to claim 4, it is characterized in that, according to the predicted load in the current reactive power value of the current active power value of generator unit, generator unit, the voltage magnitude of electrical network and the frequency of electrical network and electrical network, obtain active power reference value and the reactive power reference qref of generator unit based on the target function that described operation of power networks efficiency is maximum.
6. a control device for the generator unit driven by regenerative resource in electrical network, it comprises
Central controller, it is for obtaining active power reference value and the reactive power reference qref of generator unit according to the current reactive power value of the current active power value of the generating efficiency curve of the active volume value of energy storage device in generator unit, generator unit, generator unit, generator unit, the voltage magnitude of electrical network and the frequency computation part of electrical network;
Cell controller, it is for foundation frequency rated value, the active power rated value of generator unit, the current active power value of generator unit and described active power reference value calculate speed reference or torque reference value, and the rotating speed of the synchronous generator in described generator unit is regulated according to described speed reference or torque reference value, simultaneously according to voltage rating, the reactive power rated value of generator unit, current reactive power value and the described reactive power reference qref of generator unit calculate voltage reference value, and the output voltage amplitude of described synchronous generator is regulated according to described voltage reference value.
7. device according to claim 6, is characterized in that, described cell controller comprises:
Active volume computing module, for obtaining the present available capacity value of energy storage device according to the magnitude of voltage of energy storage device, current value and active volume calculation of initial value.
8. device according to claim 6, wherein said cell controller also comprises:
Frequency droop module, for obtaining an exemplary frequency deviation values according to the deviation of the active power rated value of generator unit and the current active power value of generator unit;
Secondary frequency adjustment module, for obtaining secondary exemplary frequency deviation values according to the deviation of the active power reference value received and active power rated value;
Frequency summation module, for obtaining speed reference by frequency rated value and the exemplary frequency deviation values obtained and secondary exemplary frequency deviation values;
The sagging module of voltage, for obtaining the first voltage deviation value according to the reactive power rated value of described generator unit and the deviation of current reactive power value;
Reactive Power Control module, for obtaining the second voltage deviation value according to the deviation of the reactive power reference qref received and reactive power rated value; And
Voltage summation module, for obtaining voltage reference value by voltage rating and the first voltage deviation value obtained and the second voltage deviation value by read group total.
9. the device according to any one of claim 6-8, is characterized in that, described central controller comprises:
Generator unit power output amplitude limit computing module, obtains the power output predicted value of the energy acquiring device of regenerative resource in the electrical network for foundation reception and the present available capacity value of described energy storage device calculates active power higher limit and the active power lower limit of described generator unit by power output amplitude limit; And
Target function generation module, for generating the maximum target function of described operation of power networks efficiency according to the active power higher limit of described generator unit and the generating efficiency curve of active power lower limit and generator unit, or when described electrical network also comprises conventional electric power generation branch road, for generating the maximum target function of described operation of power networks efficiency according to the active power higher limit of described generator unit and active power lower limit, the generating efficiency curve of generator unit and the generating efficiency curve of described conventional electric power generation branch road.
10. device according to claim 9, it is characterized in that, described central controller also comprises generator unit operational efficiency and optimizes computing module, for the predicted load in the electrical network according to the current reactive power value of the current active power value of generator unit, generator unit, the voltage magnitude of electrical network and the frequency of electrical network and reception, obtain active power reference value and the reactive power reference qref of generator unit based on the target function that described operation of power networks efficiency is maximum.
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