CN110611332A - Offshore wind power system energy storage device and control method thereof - Google Patents
Offshore wind power system energy storage device and control method thereof Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention discloses an energy storage device of an offshore wind power system, which comprises: the system comprises a marine wind field module, a power transformation module, a land power generation and transmission module and a hybrid energy storage module; the offshore wind field module is respectively connected with the power conversion module and the hybrid energy storage module and is used for outputting power to the power conversion module and the hybrid energy storage module; the power transformation module is connected with the onshore power generation and transmission module and the hybrid energy storage module and is used for converting the power output by the offshore wind field module and outputting the converted power to the onshore power generation and transmission module and the hybrid energy storage module; the hybrid energy storage module is used for absorbing or supplying power to the offshore wind farm module. The hybrid energy storage system effectively solves the problem of distribution dispersion of large onshore wind power bases and offshore wind power fields, provides inertia response for a wind power field system through the hybrid energy storage unit, combines hybrid energy storage and offshore wind power field virtual inertia control by adopting a fuzzy PID control algorithm through the hybrid energy storage unit, and makes full use of the charging and discharging functions of the hybrid energy storage module to make a power grid more stable.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to an energy storage device of an offshore wind power system and a control method thereof.
Background
In the face of the dual crisis of energy shortage and environmental pollution, renewable energy sources are vigorously developed, and the optimization of energy source structures becomes an important direction for promoting the sustainable development of global economy, energy sources and environment. Wind energy has great development potential as a clean energy source which is pollution-free and renewable, and has been paid attention and favored by more and more countries. In recent years, with encouragement and policy privilege of governments of various countries, wind power becomes the renewable energy source which grows fastest. The continuous expansion of the wind power generation scale will have a profound impact on the improvement of energy structure and environmental problems.
With the continuous progress and maturity of the installation and manufacturing technology of the offshore wind turbine, the single machine capacity of the offshore wind turbine is continuously improved, the scale of the offshore wind turbine is enlarged, and the offshore wind turbine gradually develops to offshore and even deep sea which are far away from the land and have more intensive wind energy resources. Due to the unique geographical position of the offshore wind farm, the problems of remote transportation and grid connection of the offshore wind power become one of the key factors restricting the development of the offshore wind power.
The problems of long-distance transmission and grid connection are solved by using a High Voltage Direct Current (HVDC) technology at present, the HVDC technology is very suitable for long-distance transmission of electric energy, and has the advantages of low cost, low power consumption, relatively mature technology and the like, but the stability problem of a power grid is increased along with the increase of wind power permeability.
Disclosure of Invention
The invention provides an excitation control device of a synchronous motor and a using method thereof, which aim to solve the technical problem of poor stability of a power grid along with increase of wind power permeability in the prior art.
The invention provides an energy storage device of an offshore wind power system, which comprises: the system comprises a marine wind field module, a power transformation module, a land power generation and transmission module and a hybrid energy storage module;
the offshore wind field module is respectively connected with the variable module and the hybrid energy storage module and is used for outputting power to the variable module and the hybrid energy storage module;
the power transformation module is connected with the onshore power generation and transmission module and the hybrid energy storage module and is used for converting the power output by the offshore wind field module and outputting the power to the onshore power generation and transmission module and the hybrid energy storage module;
the hybrid energy storage module is used for absorbing or supplying power to the offshore wind field module;
the onshore power generation transmission module is used for connecting the power output by the offshore wind field module to a land power grid.
Further, the offshore wind farm module comprises: a plurality of groups of wind turbine units; the wind turbine assembly comprises: the wind power generation system comprises a wind turbine, a gear box, a double-fed fan, a wind power rectifier, a wind power inverter and a first transformer;
the power transformation module includes: the system comprises a first alternating current bus, a second transformer, a second alternating current bus and a high-voltage direct current transmission unit;
the onshore power generation transmission module comprises: a land power generation transmission unit and a third alternating current bus;
the hybrid energy storage module includes: the phase-locked loop comprises a phase-locked loop, a data processing unit, a hybrid energy storage unit and a direct current bus;
the output end of the wind turbine is connected with the input shaft of the gear box; the output shaft of the gear box is connected with the input end of the double-fed fan; the output end of the double-fed fan is respectively connected with the alternating current input end of the wind power rectifier and the input end of the first transformer; the direct current output end of the wind power rectifier is connected with the direct current input end of the wind power inverter, and the direct current output end of the wind power rectifier is connected with the direct current bus; the alternating current output end of the wind power inverter is connected with the input end of the first transformer; the output end of the first transformer is connected with the first alternating current bus; the input end of the second transformer is connected with the first alternating current bus, and the output end of the second transformer is connected with the second alternating current bus; the output end of the second alternating current bus is connected with the input end of the high-voltage direct current transmission unit; the output end of the high-voltage direct-current power transmission unit is connected with the input end of the phase-locked loop; the output end of the phase-locked loop is respectively connected with the third alternating current bus and the input end of the data processing unit; the output end of the third alternating current bus is respectively connected with the input ends of the land power generation transmission unit and the data processing unit; the output end of the direct current bus is connected with the input end of the data processing unit; the output end of the data processing unit is connected with the input end of the hybrid energy storage unit, and the data processing unit outputs a voltage value and a power value which directly act on the hybrid energy storage unit based on a power angle and a frequency value obtained from the phase-locked loop, a current value and a voltage value obtained from the third alternating current bus and a current value and a voltage value obtained from the direct current bus, so as to charge the hybrid energy storage unit; and the charging and discharging end of the hybrid energy storage unit is connected with the direct current bus, and the hybrid energy storage unit charges and discharges the direct current bus based on the voltage value and the power value of the hybrid energy storage unit.
Further, the hybrid energy storage unit includes: the direct bus access end, the twenty-fourth resistor, the thirtieth resistor, the twenty-fifth reactor, the thirty-first reactor, the twenty-sixth diode, the twenty-seventh diode, the thirty-second diode, the thirty-third diode, the twenty-eighth capacitor, the thirty-fourth capacitor and the hybrid energy storage battery;
the positive electrode of the direct-current bus access end is respectively connected with one end of a twenty-fourth resistor, one end of a thirty-fourth capacitor, the positive electrode of a thirty-second diode and the first pin of the hybrid energy storage battery, and the negative electrode of the direct-current bus access end is respectively connected with the other end of the thirty-fourth capacitor, the negative electrode of a thirty-third diode, the positive electrode of a twenty-seventh diode, one end of a twenty-eighth capacitor and the first pin of the hybrid energy storage battery; the other end of the twenty-fourth resistor is connected with one end of the twenty-fifth reactor; the other end of the twenty-fifth reactor is connected with the anode of the twenty-sixth diode and the cathode of the twenty-seventh diode respectively; the cathode of the twenty-sixth diode is respectively connected with the other end of the twenty-eighth capacitor and a second pin of the hybrid energy storage battery; the anode of the thirty-third diode is connected with the anode of the thirty-second diode and one end of the thirty-first reactor respectively; the other end of the thirty-first reactance is connected with one end of the thirty-first resistor; the other end of the thirty-third resistor is connected with a second pin of the combined energy storage battery; and the input end of the hybrid energy storage battery is connected with the data processing unit.
Further, the data processing unit includes: the device comprises a virtual inertia control unit, a power frequency calculation unit, a voltage calculation unit, a power calculation unit, a first adder and a second adder;
the input end of the power frequency calculation unit is respectively connected with the output end of the third alternating current bus and the output end of the phase-locked loop, the output end of the power frequency calculation unit is respectively connected with the input end of the virtual inertia control unit and the input end of the first adder, and the power frequency calculation unit is based on the power grid voltage angle theta obtained from the phase-locked loop and the power grid voltage value U obtained from the third alternating current busabcAnd the current value I of the power gridabcAnd outputting the grid-connected power value P to the first adder through 3/2 conversion calculationgAnd based on the value of the grid-connected power PgOutputting a frequency reference value f to the virtual inertia control unitref(ii) a The input end of the virtual inertia control unit is connected with the output end of the phase-locked loop, the output end of the virtual inertia control unit is connected with the input end of the second adder, and the virtual inertia control unit is based on a frequency value f obtained from the phase-locked loopmeansFrequency reference value frefAnd calculating the output power value P to the second adder by a PID control algorithmess(ii) a The input end of the power calculation unit is connected with the output end of the direct current bus, and the voltage calculation unit is based on a voltage value U acquired from the direct current bus0And current value I0Outputting a power value P to the first adder through power calculation0(ii) a An output of the first adderThe first adder is connected with the input end of the voltage calculation unit and used for adding the grid-connected power value PgAnd a power value P0Performing addition calculation to output power value P to the voltage calculation unith(ii) a The output end of the voltage calculation unit is connected with the input end of the hybrid energy storage unit, and the voltage calculation unit is based on the power value PhOutputting a voltage input reference value U to the hybrid energy storage unit through a DC/DC converter voltage and current double closed-loop control algorithm*(ii) a The output end of the second adder is connected with the input end of the hybrid energy storage unit, and the second adder adds the power value PessAnd power offset value△PsocAfter addition, the output power of the hybrid energy storage unit is input into a reference value P*Wherein the power offset value△PsocIs a power value PhThe real-time power value P of the hybrid energy storage unit after the high-pass filtering control algorithmcAnd performing addition calculation to obtain a power deviation value.
The invention also provides a control method of the energy storage device of the offshore wind power system, which comprises the following steps: the method comprises the following steps:
step 1: obtaining a voltage value U from a DC bus0Sum current value I0(ii) a Obtaining grid voltage angle theta and frequency value f from phase-locked loopmeans(ii) a Obtaining a power grid voltage value U from a third alternating current busabcAnd the current value I of the power gridabc(ii) a Obtaining a real-time power value P from a hybrid energy storage unitc；
Step 2: the power frequency calculation unit calculates the power frequency according to the power grid voltage angle theta and the power grid voltage value UabcAnd the current value I of the power gridabcObtaining the grid-connected power value P through 3/2 conversion calculationgAnd according to the grid-connected power value PgObtaining a frequency reference value fref；
The virtual inertia control unit is used for controlling the virtual inertia according to the frequency value fmeansFrequency reference value frefThe power value P is obtained through the calculation of a PID control algorithmess；
The power calculation unit calculates the voltage value U according to0And current value I0Obtaining a power value P by power0；
And step 3: the power value P is measured0And the grid-connected power value PgPerforming addition operation to obtain power value Ph(ii) a The power value PhSequentially carrying out high-pass filtering control algorithm and addition operation and then carrying out comparison with the power value PcPerforming addition calculation to obtain power deviation value△Psoc；
And 4, step 4: the voltage calculation unit is used for calculating the power value P according to the power valuehSequentially carrying out high-pass filtering control algorithm and addition operation to obtain a voltage input reference value U*(ii) a The power value P is measuredessAnd power deviation value△PsocPerforming addition calculation to obtain power input reference value P*；
And 5: according to the power input reference value P*Setting the battery capacity of the hybrid energy storage unit; inputting a reference value U according to the voltage*Controlling the output of the hybrid energy storage unit or the output voltage and current;
step 6: obtaining the real-time power value P of the offshore wind field modulew(ii) a Obtaining expected grid-connected power Pout；
And 7: when the power value P iswGreater than the network power PoutWhen the power is consumed, the hybrid energy storage unit is switched to an energy absorption mode, and the power in the offshore wind field module is absorbed through the direct current bus;
when the power value P iswLess than said network power PoutAnd when the hybrid energy storage unit is switched to an energy supply mode, the power is transmitted to the offshore wind field module through the direct current bus.
Further, the virtual inertia control unit in step 2 controls the virtual inertia according to the frequency value fmeansFrequency reference value frefThe power value P is obtained by calculation through a PID control algorithm with P, I, D three regulatorsess。
Further, the reference value U is input according to the voltage in the step 5*The method for controlling the output of the hybrid energy storage unit or the output voltage and current comprises the following steps:inputting voltage into reference value U*And as input parameters of a DC/DC converter voltage and current double closed-loop control algorithm, the output quantity of the DC/DC converter voltage and current double closed-loop control algorithm is used for controlling the output or the output voltage and the current of the hybrid energy storage unit.
Further, the DC/DC converter voltage current double closed-loop control algorithm in step 5 is a DC/DC converter voltage current double closed-loop control algorithm adopting a fuzzy PID control algorithm.
The invention has the beneficial effects that:
the invention effectively solves the problem of distributed dispersion of large onshore wind power bases and offshore wind power plants by using HVDC technology, concentrates the dispersed wind power for long-distance and transregional delivery, provides inertia response for a wind power plant system by a hybrid energy storage module consisting of a storage battery and a super capacitor, combines hybrid energy storage and offshore wind power plant virtual inertia control by adopting fuzzy PID control, and makes full use of the charging and discharging functions of the hybrid energy storage module to make a power grid more stable.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
FIG. 1 is a schematic circuit diagram of an energy storage device of an offshore wind power system according to the present invention;
FIG. 2 is a schematic circuit diagram of the hybrid energy storage unit of the present invention;
FIG. 3 shows the output frequency reference f of the present inventionrefThe control algorithm structure chart of (1);
FIG. 4 is a diagram of a fuzzy PID control algorithm according to the invention;
FIG. 5 is a structural diagram of a voltage-current double closed-loop control algorithm of the DC/DC converter according to the present invention;
FIG. 6 shows the power-on value P in the present inventionhA processed algorithm structure chart;
fig. 7 is a structural diagram of a virtual inertia control algorithm based on energy storage in the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides an energy storage device for an offshore wind power system, including: the system comprises a marine wind field module, a power transformation module, a land power generation and transmission module and a hybrid energy storage module;
the offshore wind farm module comprises: the plurality of groups of wind turbines 45; the group of wind turbines 45 includes: the wind power generation system comprises a wind turbine 45, a gear box 46, a double-fed fan 47, a wind power rectifier 1, a wind power inverter 2 and a first transformer 48;
the power transformation module includes: a first alternating current bus 3, a second transformer 4, a second alternating current bus 6, a high voltage direct current transmission unit 36;
the onshore power generation transmission module comprises: a land power generation and transmission unit 19, a third ac bus 21;
the hybrid energy storage module includes: the phase-locked loop 37, the data processing unit, the hybrid energy storage unit 5 and the direct current bus 42;
the output end of the wind turbine 45 is connected with the input shaft of the gear box 46; the output shaft of the gear box 46 is connected with the input end of the double-fed fan 47; the output end of the double-fed fan 47 is respectively connected with the alternating current input end of the wind power rectifier 1 and the input end of the first transformer 48; the direct current output end of the wind power rectifier 1 is connected with the direct current input end of the wind power inverter 2, and the direct current output end of the wind power rectifier 1 is connected with the direct current bus 42; the alternating current output end of the wind power inverter 2 is connected with the input end of the first transformer 48; the output end of the first transformer 48 is connected with the first alternating current bus 3; the input end of the second transformer 4 is connected with the first alternating current bus 3, and the output end is connected with the second alternating current bus 6; the output end of the second alternating current bus 6 is connected with the input end of the high-voltage direct current transmission unit 36; the output end of the high-voltage direct-current power transmission unit 36 is connected with the input end of the phase-locked loop 37; the output end of the phase-locked loop 37 is respectively connected with the third alternating current bus 21 and the input end of the data processing unit; the output end of the third alternating current bus 21 is respectively connected with the input ends of the land power generation transmission unit 19 and the data processing unit; the output end of the direct current bus 42 is connected with the input end of the data processing unit; the output end of the data processing unit is connected with the input end of the hybrid energy storage unit 5, and the data processing unit outputs a voltage value and a power value which directly act on the hybrid energy storage unit 5 based on the power angle and the frequency value obtained from the phase-locked loop 37, the current value and the voltage value obtained from the third alternating current bus 21 and the current value and the voltage value obtained from the direct current bus 42, so as to charge the hybrid energy storage unit 5; the charging and discharging end of the hybrid energy storage unit 5 is connected with the direct current bus 42, and the hybrid energy storage unit 5 charges and discharges the direct current bus 42 based on the voltage value and the power value of the hybrid energy storage unit;
wherein the data processing unit includes: virtual inertia control unit 38, power frequency calculation unit 39, voltage calculation unit 40, power calculation unit 41, first adder 43, second adder 44;
the input of the power frequency calculation unit 39 is connected to the output of the third ac bus 21, the output of the phase-locked loop 37, the output of the virtual inertia control unit 38 and the input of the first adder 43, and the power frequency calculation unit 39 is based on the grid voltage angle θ obtained from the phase-locked loop 37 and the grid voltage value U obtained from the third ac bus 21abcAnd the current value I of the power gridabcThe grid-connected power value P is output to the first adder 43 through 3/2 conversion calculationgAnd based on the value of the grid-connected power PgOutputting the frequency reference value f to the virtual inertia control unit 38ref(ii) a The virtual inertia control unit 38 has an input connected to an output of the phase locked loop 37 and an output connected to an input of the second adder 44, the virtual inertia control unit 38 being based on the frequency value f obtained from the phase locked loop 37meansFrequency reference value frefThe output power value P to the second adder 44 is calculated by a PID control algorithmess(ii) a The input of the power calculating unit 41 is connected to the output of the dc bus 42, and the voltage calculating unit 40 is based on the electricity obtained from the dc bus 42Pressure value U0And current value I0The power value P is output to the first adder 43 through power calculation0(ii) a The output of the first adder 43 is connected to the input of the voltage calculation unit 40, and the first adder 43 adds the grid-connected power value PgAnd a power value P0Performs addition calculation to output power value P to voltage calculating section 40h(ii) a The output end of the voltage calculation unit 40 is connected with the input end of the hybrid energy storage unit 5, and the voltage calculation unit 40 is based on the power value PhOutputting a voltage input reference value U to the hybrid energy storage unit 5 through a DC/DC converter voltage and current double closed-loop control algorithm*(ii) a The output of the second adder 44 is connected to the input of the hybrid energy storage unit 5, and the second adder 44 adds the power value PessAnd power deviation value DeltaPsocAdding the output power input reference value P of the backward hybrid energy storage unit 5*Wherein the power deviation value Δ PsocIs a power value PhThe real-time power value P of the hybrid energy storage unit 5 after the high-pass filtering control algorithmcAnd performing addition calculation to obtain a power deviation value.
As shown in fig. 2, the hybrid energy storage unit 5 includes: the direct current bus access end 23, a twenty-fourth resistor 24, a thirty-fourth resistor 30, a twenty-fifth reactor 25, a thirty-first reactor 31, a twenty-sixth diode 26, a twenty-seventh diode 27, a thirty-second diode 32, a thirty-third diode 33, a twenty-eighth capacitor 28, a thirty-fourth capacitor 34 and a hybrid energy storage battery 29;
the positive electrode of the direct-current bus access end 23 is connected with one end of a twenty-fourth resistor 24, one end of a thirty-fourth capacitor 34, the positive electrode of a thirty-second diode 32 and the first pin of the hybrid energy storage battery 29, and the negative electrode of the direct-current bus access end 23 is connected with the other end of the thirty-fourth capacitor 34, the negative electrode of a thirty-third diode 33, the positive electrode of a twenty-seventh diode 27, one end of a twenty-eighth capacitor 28 and the first pin of the hybrid energy storage battery 29; the other end of the twenty-fourth resistor 24 is connected with one end of a twenty-fifth reactance 25; the other end of the twenty-fifth reactor 25 is connected with the anode of a twenty-sixth diode 26 and the cathode of a twenty-seventh diode 27 respectively; the cathode of the twenty-sixth diode 26 is connected with the other end of the twenty-eighth capacitor 28 and the second pin of the hybrid energy storage battery 29 respectively; the anode of the thirty-third diode 33 is connected to the anode of the thirty-second diode 32 and one end of the thirty-first reactor 31, respectively; the other end of the thirty-first reactance 31 is connected with one end of a thirty-first resistor 30; the other end of the thirtieth resistor 30 is connected with a second pin of the combined energy storage battery; the input of the hybrid energy storage battery 29 is connected to the data processing unit. The circuit can realize the charging and discharging of the hybrid energy storage battery 29.
The control method of the energy storage device of the offshore wind power system comprises the following steps:
the control method of the energy storage device of the offshore wind power system comprises the following steps: the method comprises the following steps:
step 1: obtaining a voltage value U from the DC bus 420Sum current value I0(ii) a Obtaining grid voltage angle theta and frequency f from phase locked loop 37means(ii) a Obtaining the value of the network voltage U from the third ac busbar 21abcAnd the current value I of the power gridabc(ii) a Obtaining a real-time power value P from the hybrid energy storage unit 5c；
Step 2: the power frequency calculation unit 39 calculates the grid voltage angle theta and the grid voltage value U according to the grid voltage angle thetaabcAnd the current value I of the power gridabcObtaining the grid-connected power value P through 3/2 conversion calculationgAnd according to the grid-connected power value PgObtaining a frequency reference value fref；
The virtual inertia control unit 38 calculates the frequency value f according to the frequency valuemeansFrequency reference value frefThe power value P is obtained by calculation through a PID control algorithm with P, I, D three regulatorsess；
The power calculating unit 41 calculates the voltage value U according to0And current value I0Obtaining a power value P by power0；
And step 3: the power value P is measured0And the grid-connected power value PgPerforming addition operation to obtain power value Ph(ii) a The power value PhSequentially carrying out high-pass filtering control algorithm and addition operation and then carrying out comparison with the power value PcPerforming addition calculation to obtain power deviation value delta Psoc；
And 4, step 4: the voltage calculating unit 40 calculates the power value P according to the voltagehSequentially carrying out high-pass filtering control algorithm and addition operation to obtain a voltage input reference value U*(ii) a The power value P is measuredessSum power deviation value DeltaPsocPerforming addition calculation to obtain power input reference value P*；
And 5: according to the power input reference value P*Setting the battery capacity of the hybrid energy storage unit 5; inputting voltage into reference value U*The output quantity of the voltage/current double closed-loop control algorithm of the DC/DC converter is used as the input parameter of the voltage/current double closed-loop control algorithm of the DC/DC converter adopting the fuzzy PID control algorithm to control the output or the output voltage and the output current of the hybrid energy storage unit 5;
step 6: obtaining the real-time power value P of the offshore wind field modulew(ii) a Obtaining expected grid-connected power Pout；
And 7: when the power value P iswGreater than the network power PoutWhen the power is consumed, the hybrid energy storage unit 5 is switched to an energy absorption mode, and the power in the offshore wind field module is absorbed through the direct current bus 42;
when the power value P iswLess than said network power PoutWhen the hybrid energy storage unit 5 is switched to the energy supply mode, power is transmitted to the offshore wind farm module through the direct current bus 42.
Fig. 3-7 show schematic structural diagrams of control algorithms used in the control method of the present invention, such as the structural diagram of the control algorithm for outputting the frequency reference fref shown in fig. 3, first obtaining the grid voltage angle θ through the action of the phase-locked loop PLL, transforming the grid voltage U through 3/2abcAnd the current I of the power gridabcConverting the voltage into a dq coordinate system, multiplying the voltage and the current on the dq coordinate system to obtain respective power, and adding the power to obtain grid-connected target reference power PgThen, a frequency reference value f is obtained through power-to-frequency calculationref。
FIG. 4 is a block diagram of fuzzy PID power control, where Pb *Representing both the battery power Psb *Simultaneous watchPower P of super capacitorsc *After the output power Pc is fed back, the input power Pb *Hybrid energy storage power deviation value delta PSOCActing on three parts, one part is used as an input value of a fuzzy control algorithm, and the other part is differentiated to obtain a differential change rate EcAs a second input to the fuzzy control algorithm, the last part is the input value of the PID controller, and KP，Ki，KdThree parameters respectively representing a proportional-integral-derivative link are used as input values of a PID controller, and the obtained voltage value U*Obtaining a power value P after passing through the hybrid energy storage unitcAfter passing through the power sensor as a feedback quantity.
As shown in FIG. 5, U is obtained from PID controller*With the value of the voltage U supplied by the DC/DC convertersocThe difference is used as the input of the fuzzy PID control algorithm, and the current value I obtained by the fuzzy PID control algorithm*And the current value I provided by the DC/DC converter is used as the input of a fuzzy PID control algorithm, and the output control pulse is used as a switch conducting signal of the DC/DC converter through a switch controller, and the DC/DC converter is connected with the hybrid energy storage unit.
The power current calculation block diagram shown in FIG. 6 shows the power value P obtained from FIG. 1hObtaining a super capacitor power reference value P by a high-pass filtering control algorithmsc *And a battery power reference value Psb *Wherein the reference value P of the super capacitor powersc *And a battery power reference value Psb *In FIG. 4 with Pb *Showing that U is obtained by the fuzzy PID control algorithm of figure 4*And then as an input value for the DC/DC voltage current dual closed loop control of fig. 5.
FIG. 7 is a diagram of a comprehensive virtual inertia control map based thereon, wherein fmeansFrequency value, K, provided for a phase locked loop PLLpTo scale factor, KiFor integral adjustment of coefficient, KdFor differentiating the adjustment coefficient, PessFor controlling the power output value by the virtual inertia PID, the frequency deviation of a feedback system is adopted to be subjected to proportional integral derivative(PID) controller to control the energy storage power output, namely: pess＝-KpΔf-Ki∫Δf-Kddf/dt. Power P of output*The hybrid energy storage power control system consists of two parts, wherein one part is energy storage power Pess output after PID control, and the other part is hybrid energy storage power deviation value delta Psoc. Wherein, Δ PsocComprises two parts, the first part is the power deviation delta P of the storage batterysbThe second part is the super capacitor power deviation delta PscAnd the two are used together as the input value of the hybrid energy storage unit ESS.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (8)
1. An offshore wind power system energy storage device, comprising: the system comprises a marine wind field module, a power transformation module, a land power generation and transmission module and a hybrid energy storage module;
the offshore wind field module is respectively connected with the variable module and the hybrid energy storage module and is used for outputting power to the variable module and the hybrid energy storage module;
the power transformation module is connected with the onshore power generation and transmission module and the hybrid energy storage module and is used for converting the power output by the offshore wind field module and outputting the power to the onshore power generation and transmission module and the hybrid energy storage module;
the hybrid energy storage module is used for absorbing or supplying power to the offshore wind field module;
the onshore power generation transmission module is used for connecting the power output by the offshore wind field module to a land power grid.
2. The offshore wind power system energy storage device of claim 1, wherein said offshore wind farm module comprises: a plurality of groups of wind turbine units; the wind turbine assembly comprises: the wind power generation system comprises a wind turbine, a gear box, a double-fed fan, a wind power rectifier, a wind power inverter and a first transformer;
the power transformation module includes: the system comprises a first alternating current bus, a second transformer, a second alternating current bus and a high-voltage direct current transmission unit;
the onshore power generation transmission module comprises: a land power generation transmission unit and a third alternating current bus;
the hybrid energy storage module includes: the phase-locked loop comprises a phase-locked loop, a data processing unit, a hybrid energy storage unit and a direct current bus;
the output end of the wind turbine is connected with the input shaft of the gear box; the output shaft of the gear box is connected with the input end of the double-fed fan; the output end of the double-fed fan is respectively connected with the alternating current input end of the wind power rectifier and the input end of the first transformer; the direct current output end of the wind power rectifier is connected with the direct current input end of the wind power inverter, and the direct current output end of the wind power rectifier is connected with the direct current bus; the alternating current output end of the wind power inverter is connected with the input end of the first transformer; the output end of the first transformer is connected with the first alternating current bus; the input end of the second transformer is connected with the first alternating current bus, and the output end of the second transformer is connected with the second alternating current bus; the output end of the second alternating current bus is connected with the input end of the high-voltage direct current transmission unit; the output end of the high-voltage direct-current power transmission unit is connected with the input end of the phase-locked loop; the output end of the phase-locked loop is respectively connected with the third alternating current bus and the input end of the data processing unit; the output end of the third alternating current bus is respectively connected with the input ends of the land power generation transmission unit and the data processing unit; the output end of the direct current bus is connected with the input end of the data processing unit; the output end of the data processing unit is connected with the input end of the hybrid energy storage unit, and the data processing unit outputs a voltage value and a power value which directly act on the hybrid energy storage unit based on a power angle and a frequency value obtained from the phase-locked loop, a current value and a voltage value obtained from the third alternating current bus and a current value and a voltage value obtained from the direct current bus, so as to charge the hybrid energy storage unit; and the charging and discharging end of the hybrid energy storage unit is connected with the direct current bus, and the hybrid energy storage unit charges and discharges the direct current bus based on the voltage value and the power value of the hybrid energy storage unit.
3. The offshore wind power system energy storage device of claim 2, wherein said hybrid energy storage unit comprises: the direct bus access end, the twenty-fourth resistor, the thirtieth resistor, the twenty-fifth reactor, the thirty-first reactor, the twenty-sixth diode, the twenty-seventh diode, the thirty-second diode, the thirty-third diode, the twenty-eighth capacitor, the thirty-fourth capacitor and the hybrid energy storage battery;
the positive electrode of the direct-current bus access end is respectively connected with one end of a twenty-fourth resistor, one end of a thirty-fourth capacitor, the positive electrode of a thirty-second diode and the first pin of the hybrid energy storage battery, and the negative electrode of the direct-current bus access end is respectively connected with the other end of the thirty-fourth capacitor, the negative electrode of a thirty-third diode, the positive electrode of a twenty-seventh diode, one end of a twenty-eighth capacitor and the first pin of the hybrid energy storage battery; the other end of the twenty-fourth resistor is connected with one end of the twenty-fifth reactor; the other end of the twenty-fifth reactor is connected with the anode of the twenty-sixth diode and the cathode of the twenty-seventh diode respectively; the cathode of the twenty-sixth diode is respectively connected with the other end of the twenty-eighth capacitor and a second pin of the hybrid energy storage battery; the anode of the thirty-third diode is connected with the anode of the thirty-second diode and one end of the thirty-first reactor respectively; the other end of the thirty-first reactance is connected with one end of the thirty-first resistor; the other end of the thirty-third resistor is connected with a second pin of the combined energy storage battery; and the input end of the hybrid energy storage battery is connected with the data processing unit.
4. An offshore wind power system energy storage device according to claim 2 or 3, wherein said data processing unit comprises: the device comprises a virtual inertia control unit, a power frequency calculation unit, a voltage calculation unit, a power calculation unit, a first adder and a second adder;
the power frequency calculation sheetThe input end of the element is respectively connected with the output end of the third alternating current bus and the output end of the phase-locked loop, the output end of the element is respectively connected with the input end of the virtual inertia control unit and the input end of the first adder, and the power frequency calculation unit is based on the power grid voltage angle theta obtained from the phase-locked loop and the power grid voltage value U obtained from the third alternating current busabcAnd the current value I of the power gridabcAnd outputting the grid-connected power value P to the first adder through 3/2 conversion calculationgAnd based on the value of the grid-connected power PgOutputting a frequency reference value f to the virtual inertia control unitref(ii) a The input end of the virtual inertia control unit is connected with the output end of the phase-locked loop, the output end of the virtual inertia control unit is connected with the input end of the second adder, and the virtual inertia control unit is based on a frequency value f obtained from the phase-locked loopmeansFrequency reference value frefAnd calculating the output power value P to the second adder by a PID control algorithmess(ii) a The input end of the power calculation unit is connected with the output end of the direct current bus, and the voltage calculation unit is based on a voltage value U acquired from the direct current bus0And current value I0Outputting a power value P to the first adder through power calculation0(ii) a The output end of the first adder is connected with the input end of the voltage calculation unit, and the first adder is used for connecting the grid-connected power value PgAnd a power value P0Performing addition calculation to output power value P to the voltage calculation unith(ii) a The output end of the voltage calculation unit is connected with the input end of the hybrid energy storage unit, and the voltage calculation unit is based on the power value PhOutputting a voltage input reference value U to the hybrid energy storage unit through a DC/DC converter voltage and current double closed-loop control algorithm*(ii) a The output end of the second adder is connected with the input end of the hybrid energy storage unit, and the second adder adds the power value PessAnd power offset value△PsocAfter addition, the output power of the hybrid energy storage unit is input into a reference value P*Wherein the power offset value△PsocIs a power value PhThrough high-pass filtering control calculationReal-time power value P of the hybrid energy storage unit after the methodcAnd performing addition calculation to obtain a power deviation value.
5. A control method of an energy storage device of an offshore wind power system is characterized by comprising the following steps:
step 1: obtaining a voltage value U from a DC bus0Sum current value I0(ii) a Obtaining grid voltage angle theta and frequency value f from phase-locked loopmeans(ii) a Obtaining a power grid voltage value U from a third alternating current busabcAnd the current value I of the power gridabc(ii) a Obtaining a real-time power value P from a hybrid energy storage unitc；
Step 2: the power frequency calculation unit calculates the power frequency according to the power grid voltage angle theta and the power grid voltage value UabcAnd the current value I of the power gridabcObtaining the grid-connected power value P through 3/2 conversion calculationgAnd according to the grid-connected power value PgObtaining a frequency reference value fref；
The virtual inertia control unit is used for controlling the virtual inertia according to the frequency value fmeansFrequency reference value frefThe power value P is obtained through the calculation of a PID control algorithmess；
The power calculation unit calculates the voltage value U according to0And current value I0Obtaining a power value P by power0；
And step 3: the power value P is measured0And the grid-connected power value PgPerforming addition operation to obtain power value Ph(ii) a The power value PhSequentially carrying out high-pass filtering control algorithm and addition operation and then carrying out comparison with the power value PcPerforming addition calculation to obtain power deviation value△Psoc；
And 4, step 4: the voltage calculation unit is used for calculating the power value P according to the power valuehSequentially carrying out high-pass filtering control algorithm and addition operation to obtain a voltage input reference value U*(ii) a The power value P is measuredessAnd power deviation value△PsocPerforming addition calculation to obtain power input reference value P*；
And 5: according to the power inputReference value P*Setting the battery capacity of the hybrid energy storage unit; inputting a reference value U according to the voltage*Controlling the output of the hybrid energy storage unit or the output voltage and current;
step 6: obtaining the real-time power value P of the offshore wind field modulew(ii) a Obtaining expected grid-connected power Pout；
And 7: when the power value P iswGreater than the network power PoutWhen the power is consumed, the hybrid energy storage unit is switched to an energy absorption mode, and the power in the offshore wind field module is absorbed through the direct current bus;
when the power value P iswLess than said network power PoutAnd when the hybrid energy storage unit is switched to an energy supply mode, the power is transmitted to the offshore wind field module through the direct current bus.
6. The method according to claim 5, wherein the virtual inertia control unit in step 2 controls the offshore wind power system energy storage device according to the frequency value fmeansFrequency reference value frefThe power value P is obtained by calculation through a PID control algorithm with P, I, D three regulatorsess。
7. The method for controlling the energy storage device of the offshore wind power system according to claim 5, wherein the reference value U is input according to the voltage in the step 5*The method for controlling the output of the hybrid energy storage unit or the output voltage and current comprises the following steps: inputting voltage into reference value U*And as input parameters of a DC/DC converter voltage and current double closed-loop control algorithm, the output quantity of the DC/DC converter voltage and current double closed-loop control algorithm is used for controlling the output or the output voltage and the current of the hybrid energy storage unit.
8. The method for using an excitation control device of a synchronous machine according to claim 7, wherein the DC/DC converter voltage current double closed-loop control algorithm in step 5 is a DC/DC converter voltage current double closed-loop control algorithm using a fuzzy PID control algorithm.
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