CN110611332B - Energy storage device of offshore wind power system and control method thereof - Google Patents
Energy storage device of offshore wind power system and control method thereof Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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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
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention discloses an energy storage device of an offshore wind power system, which comprises: the system comprises an offshore wind field module, a power transformation module, a land power generation transmission module and a hybrid energy storage module; the offshore wind field module is respectively connected with the power generation module and the hybrid energy storage module and is used for outputting power to the power generation module and the hybrid energy storage module; the power transformation module is connected with the land power generation transmission module and the hybrid energy storage module and is used for transforming the power output by the offshore wind field module and outputting the power to the land power generation transmission module and the hybrid energy storage module; the hybrid energy storage module is used to absorb or supply power to the offshore wind farm module. The invention effectively solves the problem of distributed dispersion of large-scale land wind power bases and open sea wind power stations, provides inertia response for wind power station systems through the hybrid energy storage unit, combines hybrid energy storage and virtual inertia control of the offshore wind power stations through the hybrid energy storage unit by adopting a fuzzy PID control algorithm, and makes full use of the charge and discharge functions of the hybrid energy storage module to enable the power grid to be 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 double crisis of energy shortage and environmental pollution, renewable energy is developed greatly, and optimizing energy structure becomes an important direction for promoting global economy-energy-environmental sustainable development. Wind energy has great potential for development as a clean energy source which is pollution-free and renewable, and has been valued and favored by more and more countries. In recent years, wind power has become the fastest growing renewable energy source with the encouragement of governments and policy offers of various countries. The continuous expansion of the scale of wind power generation will have profound effects on the improvement of energy structures 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 farm is enlarged, and the offshore wind turbine gradually develops to offshore or even deep sea far from land and with more dense wind energy resources. Because of the unique geographic location of offshore wind farms, remote transportation of offshore wind power and grid connection have become one of the key factors restricting the development of offshore wind power.
At present, the high-voltage direct current transmission (HVDC) technology is used for solving the problems of long-distance transmission and grid connection, is very suitable for long-distance transmission of electric energy, has the advantages of low cost, low power consumption, relatively mature technology and the like, and increases the stability problem of a power grid along with the increase of the permeability of wind power.
Disclosure of Invention
The invention provides an excitation control device of a synchronous motor and a use method thereof, which are used for solving the technical problem that the stability of a power grid is poor along with the increase of the permeability of wind power in the prior art.
The invention provides an energy storage device of an offshore wind power system, which comprises: the system comprises an offshore wind field module, a power transformation module, a land power generation transmission module and a hybrid energy storage module;
the offshore wind field module is respectively connected with the change module and the hybrid energy storage module and is used for outputting power to the change module and the hybrid energy storage module;
the power transformation module is connected with the land power generation transmission module and the hybrid energy storage module and is used for transforming the power output by the offshore wind field module and outputting the power to the land power generation 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 land 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 includes: an array of wind turbine units; the wind turbine includes: the wind turbine, the gear box, the doubly-fed wind turbine, the wind power rectifier, the wind power inverter and the first transformer;
the power transformation module includes: the device comprises a first alternating current bus, a second transformer, a second alternating current bus and a high-voltage direct current transmission unit;
the land power generation transmission module includes: a land power generation transmission unit and a third alternating current bus;
the hybrid energy storage module includes: the device 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; an output shaft of the gear box is connected with an input end of the double-fed fan; the output end of the doubly-fed wind turbine 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 HVDC 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 directly acting on the hybrid energy storage unit to charge 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; the charging and discharging ends of the hybrid energy storage unit are connected with the direct current bus, and the hybrid energy storage unit charges and discharges the direct current bus based on the self voltage value and the power value.
Further, the hybrid energy storage unit includes: a direct bus access terminal, a twenty-fourth resistor, a thirty-fourth resistor, a twenty-fifth reactance, a thirty-first reactance, a twenty-sixth diode, a twenty-seventh diode, a thirty-second diode, a thirty-third diode, a twenty-eighth capacitor, a thirty-fourth capacitor, and a hybrid energy storage battery;
the positive electrode of the direct current bus access end is respectively connected with one end of the twenty-fourth resistor, one end of the thirty-fourth capacitor, the positive electrode of the 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 the thirty-third diode, the positive electrode of the twenty-seventh diode, one end of the 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 respectively connected with the anode of the twenty-sixth diode and the cathode of the twenty-seventh diode; the negative electrode 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 positive electrode of the thirty-third diode is connected with the positive electrode of the thirty-second diode and one end of the thirty-first reactor respectively; the other end of the thirty-first reactor is connected with one end of the thirty-first resistor; the other end of the thirty-second resistor is connected with a second pin of the combined energy storage battery; the input end of the hybrid energy storage battery is connected with the data processing unit.
Further, the data processing unit includes: the virtual inertia control unit, the power frequency calculation unit, the voltage calculation unit, the power calculation unit, the first adder and the second adder;
input terminal of the power frequency calculation unitThe 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 third alternating current bus 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 bus abc Grid current value I abc Outputting a grid-connected power value P to the first adder through 3/2 conversion calculation g And based on the grid-connected power value P g Outputting a frequency reference value f to the virtual inertia control unit ref The method comprises the steps of carrying out a first treatment on the surface of the 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 the frequency value f obtained from the phase-locked loop means Frequency reference value f ref Calculating the output power value P to the second adder through a PID control algorithm ess The method comprises the steps of carrying out a first treatment on the surface of the The input end of the power computing unit is connected with the output end of the direct current bus, and the voltage computing unit is based on a voltage value U obtained from the direct current bus 0 Current value I 0 Outputting a power value P to the first adder through power calculation 0 The method comprises the steps of carrying out a first treatment on the surface of the 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 obtaining the grid-connected power value P g Power value P 0 Performing addition calculation to output power value P to the voltage calculation unit h The method comprises the steps of carrying out a first treatment on the surface of the The output end of the voltage calculating unit is connected with the input end of the hybrid energy storage unit, and the voltage calculating unit is based on the power value P h The voltage input reference value U is output to the hybrid energy storage unit through a DC/DC converter voltage-current double closed-loop control algorithm * The method comprises the steps of carrying out a first treatment on the surface of the The output end of the second adder is connected with the input end of the hybrid energy storage unit, and the second adder outputs the power value P ess Power offset value △ P soc Adding and outputting power input reference value P to the hybrid energy storage unit * Wherein the power offset value △ P soc Is the power value P h After passing through a high-pass filtering control algorithm, the method is matched with the high-pass filtering control algorithmReal-time power value P of hybrid energy storage unit c And carrying out 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 voltage value U from DC bus 0 And a current value I 0 The method comprises the steps of carrying out a first treatment on the surface of the Obtaining the power grid voltage angle theta and the frequency value f from the phase-locked loop means The method comprises the steps of carrying out a first treatment on the surface of the Obtaining a power grid voltage value U from a third alternating current bus abc And a grid current value I abc The method comprises the steps of carrying out a first treatment on the surface of the Acquiring real-time power value P from hybrid energy storage unit c ；
Step 2: the power frequency calculation unit calculates a power grid voltage value U according to the power grid voltage angle theta and the power grid voltage value U abc Grid current value I abc Obtaining the grid-connected power value P through 3/2 conversion calculation g And according to the grid-connected power value P g Obtaining a frequency reference value f ref ；
The virtual inertia control unit is used for controlling the virtual inertia according to the frequency value f means Frequency reference value f ref The power value P is obtained through calculation of a PID control algorithm ess ；
The power calculation unit calculates the voltage value U according to the voltage value U 0 Current value I 0 Obtaining power value P by power 0 ；
Step 3: the power value P 0 And grid-connected power value P g Adding to obtain power value P h The method comprises the steps of carrying out a first treatment on the surface of the The power value P h Sequentially performing high-pass filter control algorithm and addition operation, and then performing addition operation on the obtained value and the power value P c Performing addition calculation to obtain power deviation value △ P soc ；
Step 4: the voltage calculation unit calculates the power value P according to the power value h The voltage input reference value U is obtained through a high-pass filtering control algorithm and addition operation in sequence * The method comprises the steps of carrying out a first treatment on the surface of the The power value P ess And power offset value △ P soc Adding to obtain power input reference value P * ；
Step 5: according to the power input reference value P * Electric power to hybrid energy storage unitSetting the capacity of the pool; according to the voltage input reference value U * Controlling the output of the hybrid energy storage unit or the voltage and current of the output;
step 6: acquiring real-time power value P of offshore wind farm module w The method comprises the steps of carrying out a first treatment on the surface of the Acquiring expected grid-connected power P out ；
Step 7: when the power value P w Greater than the network power P out When the hybrid energy storage unit is switched to an energy absorption mode, the power in the offshore wind field module is absorbed through the direct current bus;
when the power value P w Less than the network power P out And when the hybrid energy storage unit is switched into an energy supply mode, power is transmitted to the offshore wind field module through the direct current bus.
Further, the virtual inertia control unit in step 2 is configured to control the virtual inertia according to the frequency value f means Frequency reference value f ref The power value P is obtained by calculation through a PID control algorithm with P, I, D three regulators ess 。
Further, in the step 5, a reference value U is input according to the voltage * The method for controlling the output of the hybrid energy storage unit or the output voltage and current comprises the following steps: input voltage to reference value U * As input parameters of the 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 of the hybrid energy storage unit or the output voltage and current.
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 using a fuzzy PID control algorithm.
The invention has the beneficial effects that:
the invention effectively solves the problems of large land wind power base and open sea wind power plant distribution dispersion by utilizing the HVDC technology, concentrates the dispersed wind power for long distance and regional outward transmission, simultaneously provides inertia response for a wind power plant system through the hybrid energy storage module consisting of the storage battery and the super capacitor, combines the hybrid energy storage and the virtual inertia control of the offshore wind power plant by adopting fuzzy PID control through the hybrid energy storage module, and makes the power grid more stable by fully utilizing the charge and discharge functions of the hybrid energy storage module.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and should not be construed as limiting the invention in any way, in which:
FIG. 1 is a schematic diagram of an offshore wind power system energy storage device according to the present invention;
FIG. 2 is a schematic diagram of a hybrid energy storage unit according to the present invention;
FIG. 3 shows the output frequency reference f in the present invention ref Is a control algorithm structure diagram of the (a);
FIG. 4 is a block diagram of a fuzzy PID control algorithm in accordance with the present invention;
FIG. 5 is a block diagram of a DC/DC converter voltage-current double closed loop control algorithm in the present invention;
FIG. 6 shows the relative power value P in the present invention h A processed algorithm structure diagram;
FIG. 7 is a block diagram of a virtual inertia control algorithm based on energy storage in the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
As shown in fig. 1, an embodiment of the present invention provides an energy storage device of an offshore wind power system, including: the system comprises an offshore wind field module, a power transformation module, a land power generation transmission module and a hybrid energy storage module;
the offshore wind farm module comprises: an array of wind turbines 45; the wind turbine 45 group includes: wind turbine 45, gear box 46, double-fed fan 47, wind power rectifier 1, wind power inverter 2, first transformer 48;
the power transformation module includes: a first ac bus 3, a second transformer 4, a second ac bus 6, a hvdc transmission unit 36;
the land power generation transmission module includes: a land power generation 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; an output shaft of the gear box 46 is connected with an input end of the doubly-fed fan 47; the output end of the doubly-fed wind turbine 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 HVDC 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 directly acting on the hybrid energy storage unit 5 to charge the hybrid energy storage unit 5 based on a power angle and a frequency value obtained from the phase-locked loop 37, a current value and a voltage value obtained from the third alternating current bus 21, and a current value and a voltage value obtained from the direct current bus 42; the charge and discharge ends of the hybrid energy storage unit 5 are 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 self voltage value and the power value;
wherein the data processing unit comprises: 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 end of the power frequency calculating unit 39 is respectively connected with the output end of the third ac bus 21 and the output end of the phase-locked loop 37, the output ends are respectively connected with the input end of the virtual inertia control unit 38 and the input end of the first adder 43, and the power frequency calculating 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 21 abc Grid current value I abc The grid-connected power value P is outputted to the first adder 43 through 3/2 conversion calculation g And based on the grid-connected power value P g Output of the frequency reference value f to the virtual inertia control unit 38 ref The method comprises the steps of carrying out a first treatment on the surface of the The virtual inertia control unit 38 has an input connected to the output of the phase-locked loop 37 and an output connected to the 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 37 means Frequency reference value f ref The output power value P to the second adder 44 is calculated by PID control algorithm ess The method comprises the steps of carrying out a first treatment on the surface of the The input end of the power calculation unit 41 is connected to the output end of the dc bus 42, and the voltage calculation unit 40 is based on the voltage value U obtained from the dc bus 42 0 Current value I 0 Output power value P to first adder 43 through power calculation 0 The method comprises the steps of carrying out a first treatment on the surface of the The output end of the first adder 43 is connected with the input end of the voltage calculation unit 40, and the first adder 43 outputs the grid-connected power value P g Power value P 0 The addition calculation is performed to output the power value P to the voltage calculation unit 40 h The method comprises the steps of carrying out a first treatment on the surface of the 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 P h The voltage input reference value U is output to the hybrid energy storage unit 5 through a DC/DC converter voltage-current double closed-loop control algorithm * The method comprises the steps of carrying out a first treatment on the surface of the The output end of the second adder 44 is connected with the input end of the hybrid energy storage unit 5, and the second adder 44 outputs the power value P ess Power deviation value Δp soc The added backward hybrid energy storage unit 5 outputs the power input reference value P * Wherein the power deviation value ΔP soc Is the power value P h The real-time power value P of the hybrid energy storage unit 5 after the high-pass filtering control algorithm c And carrying out addition calculation to obtain a power deviation value.
As shown in fig. 2, the hybrid energy storage unit 5 includes: a dc bus access terminal 23, a twenty-fourth resistor 24, a thirty-first resistor 30, a twenty-fifth reactance 25, a thirty-first reactance 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 bar access end 23 is respectively connected with one end of the twenty-fourth resistor 24, one end of the thirty-fourth capacitor 34, the positive electrode of the thirty-second diode 32 and the first pin of the hybrid energy storage battery 29, and the negative electrode of the direct current bus bar access end 23 is respectively connected with the other end of the thirty-fourth capacitor 34, the negative electrode of the thirty-third diode 33, the positive electrode of the twenty-seventh diode 27, one end of the 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 to one end of a twenty-fifth reactance 25; the other end of the twenty-fifth reactor 25 is connected with the anode of the twenty-sixth diode 26 and the cathode of the 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 positive electrode of the thirty-third diode 33 is connected with the positive electrode of the thirty-second diode 32 and one end of the thirty-first reactor 31; the other end of the thirty-first reactance 31 is connected with one end of the thirty-first resistor 30; the other end of the thirty-second 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 a data processing unit. The circuit can realize the charge and discharge 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 voltage values U from DC bus 42 0 And a current value I 0 The method comprises the steps of carrying out a first treatment on the surface of the Obtaining the grid voltage angle θ and the frequency value f from the phase-locked loop 37 means The method comprises the steps of carrying out a first treatment on the surface of the From a third communicationObtaining the voltage value U of the power grid on the bus 21 abc And a grid current value I abc The method comprises the steps of carrying out a first treatment on the surface of the Acquiring real-time power value P from hybrid energy storage unit 5 c ；
Step 2: the power frequency calculation unit 39 calculates a power grid voltage value U according to the power grid voltage angle θ abc Grid current value I abc Obtaining the grid-connected power value P through 3/2 conversion calculation g And according to the grid-connected power value P g Obtaining a frequency reference value f ref ；
The virtual inertia control unit 38 controls the frequency value f means Frequency reference value f ref The power value P is obtained by calculation through a PID control algorithm with P, I, D three regulators ess ；
The power calculation unit 41 calculates the voltage value U based on the voltage value U 0 Current value I 0 Obtaining power value P by power 0 ；
Step 3: the power value P 0 And grid-connected power value P g Adding to obtain power value P h The method comprises the steps of carrying out a first treatment on the surface of the The power value P h Sequentially performing high-pass filter control algorithm and addition operation, and then performing addition operation on the obtained value and the power value P c Performing addition calculation to obtain a power deviation value delta P soc ；
Step 4: the voltage calculation unit 40 calculates the power value P based on the power value h The voltage input reference value U is obtained through a high-pass filtering control algorithm and addition operation in sequence * The method comprises the steps of carrying out a first treatment on the surface of the The power value P ess And power offset ΔP soc Adding to obtain power input reference value P * ；
Step 5: according to the power input reference value P * Setting the battery capacity of the hybrid energy storage unit 5; input voltage to reference value U * As input parameters of a DC/DC converter voltage-current double closed-loop control algorithm adopting a fuzzy PID control algorithm, the output quantity of the DC/DC converter voltage-current double closed-loop control algorithm is used for controlling the output of the hybrid energy storage unit 5 or the output voltage and current;
step 6: acquiring real-time power value P of offshore wind farm module w The method comprises the steps of carrying out a first treatment on the surface of the Acquisition periodGrid-connected power P out ；
Step 7: when the power value P w Greater than the network power P out When the hybrid energy storage unit 5 is switched to an energy absorption mode, the power in the offshore wind farm module is absorbed through the direct current bus 42;
when the power value P w Less than the network power P out At this time, the hybrid energy storage unit 5 is switched to the energy supply mode, and power is supplied to the offshore wind farm module via the dc bus 42.
Fig. 3 to 7 are schematic diagrams of the control algorithm used in the control method of the present invention, and are shown in the control algorithm structure diagram of the output frequency reference fref shown in fig. 3, wherein the power grid voltage angle θ is obtained by the action of the phase-locked loop PLL, and the power grid voltage U is converted by 3/2 abc And grid current I abc Transforming the power 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 P g Then obtaining a frequency reference value f through power-to-frequency calculation ref 。
FIG. 4 shows a fuzzy PID power control block diagram, where P b * Representing both the battery power P sb * At the same time represent super capacitor power P sc * The output power Pc is fed back and then is matched with the input power P b * Hybrid stored energy power offset value Δp of (a) SOC Acting on three parts, one part being an input value of the fuzzy control algorithm and the other part being differentiated to obtain a differential change rate E c As the second input quantity of the fuzzy control algorithm, the last part is the input value of the PID controller, and K P ，K i ，K d Respectively representing three parameters of the proportional integral derivative link as input values of the PID controller, and obtaining a voltage value U * Obtaining a power value P through the mixed energy storage unit c As a feedback quantity after passing through the power sensor.
As shown in fig. 5, the voltage-current double closed-loop control structure diagram of the DC/DC converter is U obtained by a PID controller * Voltage value U supplied with DC/DC converter soc The difference is used as a fuzzy PID control algorithmIs obtained by a fuzzy PID control algorithm * 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 conduction signal of the DC/DC converter, and the DC/DC converter is connected with the hybrid energy storage unit.
The power value P obtained in FIG. 1 is shown in the power current calculation block diagram of FIG. 6 h The super capacitor power reference value P is obtained by a high-pass filtering control algorithm sc * And battery power reference value P sb * Wherein the super capacitor power reference value P sc * And battery power reference value P sb * In FIG. 4, P is used b * The representation is that U is obtained by the fuzzy PID control algorithm of FIG. 4 * Which is then used as the 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 based on f means Frequency value, K, provided for a phase-locked loop, PLL p For the proportional adjustment factor, K i To integrate the adjustment coefficient, K d For differentiating the adjustment coefficient, P ess For the virtual inertia PID control power output value, the feedback system frequency deviation is adopted to control the energy storage power output through a proportional-integral-derivative (PID) controller, namely: p (P) ess ＝-K p Δf-K i ∫Δf-K d df/dt. Output power P * Consists of two parts, wherein one part is the stored energy power Pess which is output based on PID control, and the other part is the hybrid stored energy power deviation value delta P soc . Wherein DeltaP soc Comprises two parts, wherein the first part is the power deviation delta P of the storage battery sb The second part is the power deviation delta P of the super capacitor sc Together, they serve as inputs to the hybrid energy storage cell ESS.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations are within the scope of the invention as defined by the appended claims.
Claims (5)
1. An offshore wind power system energy storage device, comprising: the system comprises an offshore wind field module, a power transformation module, a land power generation transmission module and a hybrid energy storage module;
the offshore wind field module is respectively connected with the power transformation module and the hybrid energy storage module and is used for outputting power to the power transformation module and the hybrid energy storage module;
the power transformation module is connected with the land power generation transmission module and the hybrid energy storage module and is used for transforming the power output by the offshore wind field module and outputting the power to the land power generation 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 land power generation transmission module is used for connecting the power output by the offshore wind field module to a land power grid;
the offshore wind farm module comprises: an array of wind turbine units; the wind turbine includes: the wind turbine, the gear box, the doubly-fed wind turbine, the wind power rectifier, the wind power inverter and the first transformer;
the power transformation module includes: the device comprises a first alternating current bus, a second transformer, a second alternating current bus and a high-voltage direct current transmission unit;
the land power generation transmission module includes: a land power generation transmission unit and a third alternating current bus;
the hybrid energy storage module includes: the device 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; an output shaft of the gear box is connected with an input end of the double-fed fan; the output end of the doubly-fed wind turbine 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 HVDC 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 directly acting on the hybrid energy storage unit to charge 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; 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 self voltage value and the power value;
the hybrid energy storage unit includes: a direct bus access terminal, a twenty-fourth resistor, a thirty-fourth resistor, a twenty-fifth reactance, a thirty-first reactance, a twenty-sixth diode, a twenty-seventh diode, a thirty-second diode, a thirty-third diode, a twenty-eighth capacitor, a thirty-fourth capacitor, and a hybrid energy storage battery;
the positive electrode of the direct current bus access end is respectively connected with one end of the twenty-fourth resistor, one end of the thirty-fourth capacitor, the positive electrode of the 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 the thirty-third diode, the positive electrode of the twenty-seventh diode, one end of the 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 respectively connected with the anode of the twenty-sixth diode and the cathode of the twenty-seventh diode; the negative electrode 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 positive electrode of the thirty-third diode is connected with the positive electrode of the thirty-second diode and one end of the thirty-first reactor respectively; the other end of the thirty-first reactor is connected with one end of the thirty-first resistor; the other end of the thirty-second resistor is connected with a second pin of the combined energy storage battery; the input end of the hybrid energy storage battery is connected with the data processing unit;
the data processing unit includes: the virtual inertia control unit, the power frequency calculation unit, the voltage calculation unit, the power calculation unit, the first adder and the 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 bus abc Grid current value I abc Outputting a grid-connected power value P to the first adder through 3/2 conversion calculation g And based on the grid-connected power value P g Outputting a frequency reference value f to the virtual inertia control unit ref The method comprises the steps of carrying out a first treatment on the surface of the 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 the frequency value f obtained from the phase-locked loop means Frequency reference value f ref Calculating the output power value P to the second adder through a PID control algorithm ess The method comprises the steps of carrying out a first treatment on the surface of the The input end of the power computing unit is connected with the output end of the direct current bus, and the voltage computing unit is based on a voltage value U obtained from the direct current bus 0 Current value I 0 Outputting a power value P to the first adder through power calculation 0 The method comprises the steps of carrying out a first treatment on the surface of the The output end of the first adder is connected with the input end of the voltage calculation unit, and the first adderThe grid-connected power value P g Power value P 0 Performing addition calculation to output power value P to the voltage calculation unit h The method comprises the steps of carrying out a first treatment on the surface of the The output end of the voltage calculating unit is connected with the input end of the hybrid energy storage unit, and the voltage calculating unit is based on the power value P h The voltage input reference value U is output to the hybrid energy storage unit through a DC/DC converter voltage-current double closed-loop control algorithm * The method comprises the steps of carrying out a first treatment on the surface of the The output end of the second adder is connected with the input end of the hybrid energy storage unit, and the second adder outputs the power value P ess Power offset value △ P soc Adding and outputting power input reference value P to the hybrid energy storage unit * Wherein the power offset value △ P soc Is the power value P h The real-time power value P of the hybrid energy storage unit after passing through a high-pass filtering control algorithm c And carrying out addition calculation to obtain a power deviation value.
2. A control method for an offshore wind power system energy storage device according to claim 1, comprising the steps of:
step 1: obtaining voltage value U from DC bus 0 And a current value I 0 The method comprises the steps of carrying out a first treatment on the surface of the Obtaining the power grid voltage angle theta and the frequency value f from the phase-locked loop means The method comprises the steps of carrying out a first treatment on the surface of the Obtaining a power grid voltage value U from a third alternating current bus abc And a grid current value I abc The method comprises the steps of carrying out a first treatment on the surface of the Acquiring real-time power value P from hybrid energy storage unit c ；
Step 2: the power frequency calculation unit calculates a power grid voltage value U according to the power grid voltage angle theta and the power grid voltage value U abc Grid current value I abc Obtaining the grid-connected power value P through 3/2 conversion calculation g And according to the grid-connected power value P g Obtaining a frequency reference value f ref ；
The virtual inertia control unit is used for controlling the virtual inertia according to the frequency value f means Frequency reference value f ref The power value P is obtained through calculation of a PID control algorithm ess ；
The power calculation unit calculates the voltage value U according to the voltage value U 0 Current value I 0 Obtaining power value P by power 0 ；
Step 3: the power value P 0 And grid-connected power value P g Adding to obtain power value P h The method comprises the steps of carrying out a first treatment on the surface of the The power value P h Sequentially performing high-pass filter control algorithm and addition operation, and then performing addition operation on the obtained value and the power value P c Performing addition calculation to obtain power deviation value △ P soc ；
Step 4: the voltage calculation unit calculates the power value P according to the power value h The voltage input reference value U is obtained through a high-pass filtering control algorithm and addition operation in sequence * The method comprises the steps of carrying out a first treatment on the surface of the The power value P ess And power offset value △ P soc Adding to obtain power input reference value P * ；
Step 5: according to the power input reference value P * Setting the battery capacity of the hybrid energy storage unit; according to the voltage input reference value U * Controlling the output of the hybrid energy storage unit or the voltage and current of the output;
step 6: acquiring real-time power value P of offshore wind farm module w The method comprises the steps of carrying out a first treatment on the surface of the Acquiring expected grid-connected power P out ；
Step 7: when the power value P w Greater than the network power P out When the hybrid energy storage unit is switched to an energy absorption mode, the power in the offshore wind field module is absorbed through the direct current bus;
when the power value P w Less than the network power P out And when the hybrid energy storage unit is switched into an energy supply mode, power is transmitted to the offshore wind field module through the direct current bus.
3. The method for controlling an energy storage device of an offshore wind power system according to claim 2, wherein the virtual inertia control unit in step 2 is configured to control the energy storage device according to the frequency value f means Frequency reference value f ref The power value P is obtained by calculation through a PID control algorithm with P, I, D three regulators ess 。
4. The method for controlling an energy storage device of an offshore wind power system according to claim 2, 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: input voltage to reference value U * As input parameters of the 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 of the hybrid energy storage unit or the output voltage and current.
5. The method for controlling an energy storage device of an offshore wind power system according to claim 4, wherein the DC/DC converter voltage-current double closed-loop control algorithm in the step 5 is a DC/DC converter voltage-current double closed-loop control algorithm using a fuzzy PID control algorithm.
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