CN113517683A - Direct-current grid-connected double-fed wind power generation system with energy stored at rotor side and control method thereof - Google Patents

Direct-current grid-connected double-fed wind power generation system with energy stored at rotor side and control method thereof Download PDF

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Publication number
CN113517683A
CN113517683A CN202110911429.6A CN202110911429A CN113517683A CN 113517683 A CN113517683 A CN 113517683A CN 202110911429 A CN202110911429 A CN 202110911429A CN 113517683 A CN113517683 A CN 113517683A
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China
Prior art keywords
current
rotor
reference value
stator
fed wind
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Inventor
崔学深
吴浩
刘其辉
赵成勇
申旭辉
汤海雁
李峥
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Huaneng Clean Energy Research Institute
North China Electric Power University
Huaneng Group Technology Innovation Center Co Ltd
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Huaneng Clean Energy Research Institute
North China Electric Power University
Huaneng Group Technology Innovation Center Co Ltd
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Priority to CN202110911429.6A priority Critical patent/CN113517683A/en
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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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J1/102—Parallel operation of dc sources being switching converters
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/14—Balancing the load in a network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/007—Control circuits for doubly fed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2101/00—Special adaptation of control arrangements for generators
    • H02P2101/15—Special adaptation of control arrangements for generators for wind-driven turbines

Abstract

The invention relates to a direct current grid-connected double-fed wind power generation system with energy stored at a rotor side and a control method thereof.A rotor side of a double-fed wind power generator is connected with an energy storage device through a rotor side converter RSC, and a stator side of the double-fed wind power generator is connected with a direct current power grid through diode rectification bridge; and the signal input end of the control unit is connected with the signal output ends of the current sensor, the voltage sensor and the optical code disc, and the control unit controls the RSC according to the rotor voltage reference value obtained by the PI regulating unit so as to control the charging and discharging of the energy storage device. The invention can flexibly and effectively control the charging and discharging of the energy storage device.

Description

Direct-current grid-connected double-fed wind power generation system with energy stored at rotor side and control method thereof
Technical Field
The invention relates to a direct-current grid-connected double-fed wind power generation system with energy stored at the rotor side and a control method thereof.
Background
The development of new energy is an important measure for solving the energy crisis and realizing the carbon neutralization goal in China. The wind energy reserves are abundant, and the double-fed wind generator (DFIG) is one of the most potential new energy sources, wherein the double-fed wind generator (DFIG) has high generating efficiency, small capacity of a power converter and low cost.
Because wind power has the characteristics of intermittence, instability and the like, energy storage is commonly used in a wind power generation system to play important roles in stabilizing wind power fluctuation and improving the stability of a power system. The energy storage access wind power generation system usually needs additional equipment such as a DC-DC converter and the like for energy storage charging and discharging control, and the additional equipment can increase the system cost and improve the control difficulty. The rotor side energy storage is that a rotor side converter RSC in the double-fed wind power generation system is connected with an energy storage device, and the control of charging and discharging of a battery is realized by controlling the RSC, so that in the rotor side energy storage, the energy storage device can be directly connected into the wind power generation system without other equipment, and the cost of the part can be saved.
In a double-fed wind power generation system with energy storage at the rotor side, the charging and discharging states of a battery depend on the magnitude and the flow direction of slip power at the rotor side. As shown in fig. 1, when the wind power generation system is ac grid-connected, the charging and discharging state of the battery cannot be flexibly controlled, because the stator voltage frequency can only be constant as the power frequency, the synchronous speed is also a constant value, and the battery can be charged only when the rotation speed is higher than the synchronous speed, and the rotation speed is lower than the synchronous speed, the battery can not be discharged, and flexible charging and discharging can not be performed according to the self state of the battery, even if the wind speed is too low or too high, the discharging and charging current of the battery may exceed the maximum charging and discharging battery allowed by the battery, and the service life of the battery is affected.
Disclosure of Invention
The invention aims to provide a direct-current grid-connected double-fed wind power generation system with energy stored at the rotor side and a control method, which can flexibly and effectively control the charging and discharging of an energy storage device.
Based on the same purpose, the invention has two independent technical schemes:
1. a direct current grid-connected double-fed wind power generation system with energy stored at a rotor side comprises a double-fed wind power generator and an energy storage device, wherein the rotor side of the double-fed wind power generator is connected with the energy storage device through a rotor side converter RSC, and the stator side of the double-fed wind power generator is in bridge connection with a direct current power grid through diode rectification; further comprising:
the current sensor and the voltage sensor are respectively used for detecting the stator side current, the rotor side current and the stator side voltage of the doubly-fed wind generator;
the optical coded disc is used for detecting the rotating speed of the rotor of the doubly-fed wind generator;
the PI adjusting unit is used for carrying out PI adjustment on a stator flux linkage and stator side output power of the doubly-fed wind generator and outputting a rotor voltage reference value of the doubly-fed wind generator;
and the signal input end of the control unit is connected with the signal output ends of the current sensor, the voltage sensor and the optical code disc, and the control unit controls the rotor side converter RSC according to the rotor voltage reference value obtained by the PI regulating unit so as to control the charging and discharging of the energy storage device.
Further, the control unit determines a current reference value of the energy storage device according to the current wind parameter and the current energy storage device parameter; obtaining a current stator voltage frequency reference value of the doubly-fed wind generator according to a current rotor rotating speed and a current reference value of the energy storage device; and according to the current stator voltage frequency reference value, obtaining a rotor voltage reference value of the doubly-fed wind generator through PI regulation of the PI regulation unit.
Further, the control unit obtains a stator flux linkage reference value and a stator side output power reference value according to the current stator voltage frequency reference value; and the control unit calculates and obtains a current stator flux linkage value and a stator side output power value according to current voltage and current values of the doubly-fed wind generator and the direct-current power grid.
Further, the PI regulation unit sequentially carries out PI regulation on a stator flux linkage and a rotor current d-axis component of the doubly-fed wind generator to obtain a rotor voltage d-axis component reference value; and sequentially carrying out PI regulation on the stator side output power and the rotor current q-axis component of the doubly-fed wind generator to obtain a rotor voltage q-axis component reference value.
Further, the control unit realizes PI regulation through a PI regulation algorithm.
Furthermore, the diode rectifier bridge is an uncontrollable diode rectifier bridge, so that the doubly-fed wind driven generator outputs power unidirectionally at the stator side, and the doubly-fed wind driven generator is in a super-synchronous power generation operation state or a sub-synchronous power generation operation state.
2. A control method of the direct-current grid-connected double-fed wind power generation system with the rotor side for energy storage comprises the following steps:
step 1: obtaining stator side current, rotor side current and stator side voltage of the doubly-fed wind generator through a current sensor and a voltage sensor; obtaining the rotating speed of the rotor of the doubly-fed wind generator through an optical code disc;
step 2: determining a current reference value of the energy storage device according to the current wind power parameter and the current energy storage device parameter; obtaining a current stator voltage frequency reference value according to the current rotor rotating speed and the current reference value of the energy storage device;
and step 3: obtaining a rotor voltage reference value of the doubly-fed wind generator through PI regulation according to a current stator voltage frequency reference value;
and 4, step 4: and according to the rotor voltage reference value, the control unit outputs a PMW signal to control the rotor side converter RSC so as to control the charging and discharging of the energy storage device.
Further, in step 2, the current stator voltage frequency reference value is obtained by the following formula:
Figure BDA0003203517420000041
in the formula, nrAs the rotor speed, PnIs the number of pole pairs of the motor, fsIs a stator voltage frequency reference, PcusFor stator copper loss, PcurFor rotor copper loss, IbIs a reference value of the current of the energy storage device, UbIs the reference value of the energy storage device voltage, ksTo set the coefficients.
Further, in the step 2, when the current charge amount of the energy storage device is within a normal range, determining a current reference value of the energy storage device, so that the doubly-fed wind power generator tracks the maximum wind energy and works in a power generation operation mode;
when the current charge amount of the energy storage device is lower than a normal range, determining a current reference value of the energy storage device, so that the energy storage device is charged, and the doubly-fed wind driven generator is in a super-synchronous power generation running state;
and when the current charge amount of the energy storage device is higher than the normal range, determining the current reference value of the energy storage device, so that the energy storage device discharges, and the doubly-fed wind driven generator is in a sub-synchronous power generation running state.
Further, step 3 includes the following steps:
step 3.1: the control unit obtains a stator flux linkage reference value and a stator side output power reference value according to a current stator voltage frequency reference value;
stator magnetChain reference value psisObtained by the following formula,
Figure BDA0003203517420000051
in the formula, #sIs a stator flux reference value, udFor the value of the DC network voltage, fsIs a stator voltage frequency reference;
stator-side output power reference value PS *Obtained by the following formula:
PS *＝ksnr 2fs+Pcus
in the formula, ksTo set the coefficients, nrAs the rotational speed of the rotor, fsIs a stator voltage frequency reference, PcusThe stator copper loss is considered;
step 3.2: the PI regulation unit sequentially carries out PI regulation on a stator flux linkage and a rotor current d-axis component of the doubly-fed wind generator to obtain a rotor voltage d-axis component reference value; and sequentially carrying out PI regulation on the stator side output power and the rotor current q-axis component of the doubly-fed wind generator to obtain a rotor voltage q-axis component reference value.
The invention has the following beneficial effects:
the rotor side of the double-fed wind driven generator is connected with an energy storage device through a rotor side converter RSC, and the stator side of the double-fed wind driven generator is rectified and bridged with a direct current power grid through a diode; the double-fed wind power generator further comprises a PI adjusting unit, and the rotor voltage reference value of the double-fed wind power generator is output after the PI adjustment of the PI adjusting unit; and the signal input end of the control unit is connected with the signal output ends of the voltage sensor, the current sensor and the optical code disc, and the control unit controls the rotor side converter RSC according to the rotor voltage reference value obtained by the PI regulating unit so as to control the charging and discharging of the energy storage device. The double-fed wind driven generator is connected with a direct-current power grid, the stator voltage frequency does not need to be constant as the power frequency, the charging and discharging of the energy storage device are flexibly and effectively controlled through the rotor side converter RSC by utilizing the adjustability of the stator voltage frequency of the double-fed wind driven generator, the structure is simple, the design is reasonable, and the cost is effectively reduced. According to the invention, the rotor side converter RSC is directly connected to the energy storage device, so that the cost of the DC-DC converter can be saved, the system cost is further reduced, and the effect of flexibly adjusting the generated power can be directly realized without energy conversion for multiple times. The energy storage device is connected through the rotor side, and can discharge to drive the DFIG unit to generate electricity to operate when wind power is insufficient; when wind power is excessive, the wind energy is absorbed to charge the energy storage device, the problem of wind power fluctuation can be directly solved on the spot while the wind energy utilization rate is improved, and the wind power generation device is more direct and has higher efficiency. Meanwhile, due to the existence of the battery energy storage device on the rotor side, when the direct-current bus fails, the rotor side is not affected, the energy storage device can be used for establishing initial excitation to drive the wind driven generator to generate electricity, and the double-fed wind driven generator set serves as a black start power supply to enable the DFIG to be started automatically and help the wind power microgrid to realize black start, so that the reliability of the system is improved. The direct-current grid-connected double-fed wind power generation system with the energy stored at the rotor side has the advantages of low cost, high reliability, simplicity in control, convenience in starting and the like.
The control unit determines the current reference value of the energy storage device according to the current wind power parameter and the current energy storage device parameter; obtaining a current stator voltage frequency reference value of the doubly-fed wind generator according to a current rotor rotating speed and a current reference value of the energy storage device; according to the current stator voltage frequency reference value, the rotor voltage reference value of the doubly-fed wind generator is obtained through PI regulation of the PI regulation unit; the control unit obtains a stator flux linkage reference value and a stator side output power reference value according to the current stator voltage frequency reference value; the control unit calculates and obtains a current stator flux linkage value and a stator side output power value according to current voltage and current values of the doubly-fed wind generator and the direct-current power grid; the PI regulation unit sequentially carries out PI regulation on a stator flux linkage and a rotor current d-axis component of the doubly-fed wind generator to obtain a rotor voltage d-axis component reference value; and sequentially carrying out PI regulation on the stator side output power and the rotor current q-axis component of the doubly-fed wind generator to obtain a rotor voltage q-axis component reference value. According to the method, the rotor voltage reference value is obtained, the rotor side converter RSC is further controlled, the charging and discharging of the energy storage device are controlled, the current wind power (parameters) and the self requirements of the current energy storage device (parameters) are considered, and the charging and discharging of the energy storage device are controlled more flexibly and effectively.
Drawings
FIG. 1 is a schematic diagram of a conventional AC grid-connected double-fed wind power generation system;
FIG. 2 is a schematic circuit diagram of the DC grid-connected double-fed wind power generation system of the present invention;
fig. 3 is a control schematic diagram of the direct current grid-connected double-fed wind power generation system.
Detailed Description
The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that functional, methodological, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.
The first embodiment is as follows:
direct-current grid-connected double-fed wind power generation system with energy stored at rotor side
As shown in fig. 2, the double-fed wind turbine generator DFIG includes an energy storage device, and in this embodiment, the energy storage device adopts an energy storage battery 1, but the energy storage device is not limited to battery energy storage, and includes energy storage devices such as a super capacitor and a solid-state battery. The battery energy storage is formed by connecting 70-200 battery monomers in series, the voltage range is 200V-600V, and the battery current range is 20 Ah-300 Ah. The rotor side of the doubly-fed wind driven generator is connected with the energy storage device through a rotor side converter RSC 4, the stator side of the doubly-fed wind driven generator is connected with a direct current power grid through a diode rectifier bridge 8, in the embodiment, the diode rectifier bridge is an uncontrollable diode rectifier bridge, so that the stator side of the doubly-fed wind driven generator outputs power unidirectionally, and the doubly-fed wind driven generator is in a super-synchronous power generation running state or a sub-synchronous power generation running state.
Further comprising:
the double-fed wind driven generator stator side current detection device comprises a current sensor 5 and a voltage sensor 7, wherein the current sensor 5 and the voltage sensor 7 are respectively used for detecting the stator side current i of the double-fed wind driven generatorsa、isb、iscRotor side current ira、irb、ircAnd stator side voltage usa、usb、uscThe DC power grid can also be provided with a voltage sensor for collecting the voltage u of the DC power gridd。
An optical coded disc 6, wherein the optical coded disc 6 is used for detecting the rotor speed n of the doubly-fed wind generatorr；
A PI adjusting unit (PI adjuster) 3, wherein the PI adjusting unit is used for outputting a rotor voltage reference value of the doubly-fed wind generator after PI adjustment;
and the control unit 2 adopts a DSP control unit in the embodiment, the signal input end of the control unit is connected with the signal output ends of the voltage sensor, the current sensor and the optical code disc, and the control unit controls the rotor side converter RSC 4 according to the rotor voltage reference value obtained by the PI adjusting unit so as to control the charging and discharging of the energy storage device.
The control unit determines a current reference value of the energy storage device according to the current wind parameter and the current energy storage device parameter; and obtaining a current stator voltage frequency reference value of the doubly-fed wind generator according to the current rotor rotating speed and the current reference value of the energy storage device.
The control unit obtains a stator flux linkage reference value and a stator side output power reference value according to a current stator voltage frequency reference value; and the control unit calculates and obtains a current stator flux linkage value and a stator side output power value according to current voltage and current values of the doubly-fed wind generator and the direct-current power grid.
The PI regulation unit sequentially carries out PI regulation on a stator flux linkage and a rotor current d-axis component of the doubly-fed wind generator to obtain a rotor voltage d-axis component reference value; and sequentially carrying out PI regulation on the stator side output power and the rotor current q-axis component of the doubly-fed wind generator to obtain a rotor voltage q-axis component reference value.
The PI adjusting unit can be hardware, and the control unit is in communication connection with the PI adjusting unit; or the PI regulation unit is a PI regulation algorithm, and the control unit realizes PI regulation through the PI regulation algorithm.
Example two:
control method of direct-current grid-connected double-fed wind power generation system with rotor side energy storage function
As shown in fig. 3, the method comprises the following steps:
step 1: obtaining the stator side current i of the doubly-fed wind generator through a current sensor and a voltage sensorsa、isb、iscRotor side current ira、irb、ircAnd stator side voltage usa、usb、usc(ii) a Obtaining the rotor speed n of the doubly-fed wind generator through an optical code discr。
In FIG. 3, θsRepresenting stator position angle, θrRepresenting rotor position angle, thetaslRepresenting the angle of rotation, ωrRepresenting the rotor angular velocity.
Step 2: determining a current reference value of the energy storage device according to the current wind power parameter and the current energy storage device parameter; and obtaining a current stator voltage frequency reference value according to the current rotor rotating speed and the current reference value of the energy storage device.
Determining the current reference value of the energy storage device:
when the current charge amount of the energy storage device is within a normal range, determining a current reference value of the energy storage device, so that the doubly-fed wind generator tracks the maximum wind energy and works in a power generation operation mode; when the current charge amount of the energy storage device is lower than a normal range, determining a current reference value of the energy storage device, so that the energy storage device is charged, and the doubly-fed wind driven generator is in a super-synchronous power generation running state; and when the current charge amount of the energy storage device is higher than the normal range, determining the current reference value of the energy storage device, so that the energy storage device discharges, and the doubly-fed wind driven generator is in a sub-synchronous power generation running state.
And discharging the energy storage battery, wherein the corresponding DFIG is in a sub-synchronous power generation state, and the charging of the energy storage battery is in a super-synchronous power generation state corresponding to the DFIG. When the rotating speed of the rotor is lower than the synchronous speed, the DFIG runs in a sub-synchronous mode, the slip ratio is positive, slip power flows to the rotor from the battery, and therefore the battery discharges; when the rotating speed of the rotor is higher than the synchronous speed, the DFIG runs in a super-synchronous mode, the slip ratio is negative, slip power flows out from the rotor side, and therefore the battery is charged. And the charge and discharge control of the battery should be matched with the self requirement of the battery, and flexible control can be performed according to the charge and discharge requirement of the battery. For example, if the battery is too charged, the battery needs to be discharged, and if the battery is not charged, the battery needs to be charged.
Obtaining a current stator voltage frequency reference value:
the stator and the rotor all adopt the motor convention, the number of pole pairs of the motor is Pn, so that the slip ratio expression can be obtained by calculating the rotating speed as follows:
Figure BDA0003203517420000101
in the formula, ns，nr-synchronous speed, rotor speed;
fs-stator frequency.
Under the dual-motor convention, in a doubly-fed wind generator, the output power of the wind turbine is:
Pv＝-0.5ρSv3Cp
Pv＝PM-sPM
in the formula PV-the fan output power;
PM-electromagnetic power.
Under the condition of considering the losses of the stator and the rotor, such as copper loss and the like, the stator side and the rotor side respectively have the following power relational expressions:
PM+Pcus＝Ps
-sPM+Pcur＝Pr
in the formula, Ps and Pr are the power flowing out from the stator and the rotor sides, and are referred to as the stator and the rotor power for short;
Pcus，Pcurthe copper consumption of the stator and the rotor,
Figure BDA0003203517420000102
the relationship between stator and rotor power thus obtained is:
Pr-Pcur＝-s(Ps-Pcus)
the energy exchange between the energy storage battery and the rotor side can be expressed as follows in consideration of the loss of the converter at the rotor side:
Pr+PRSC＝UbIb
in the formula PRSC-rotor side converter losses;
Ub，Ib-battery voltage and current.
In summary, the current stator voltage frequency reference fsObtained by the following formula:
Figure BDA0003203517420000111
in the formula, nrAs the rotor speed, PnIs the number of pole pairs of the motor, fsIs a stator voltage frequency reference, PcusFor stator copper loss, PcurFor rotor copper loss, IbIs a reference value of the current of the energy storage device, UbIs the reference value of the energy storage device voltage, ksTo set the coefficients.
And step 3: and obtaining a rotor voltage reference value of the doubly-fed wind generator through PI regulation according to the current stator voltage frequency reference value.
Step 3.1: and the control unit obtains a stator flux linkage reference value and a stator side output power reference value according to the current stator voltage frequency reference value.
Stator flux linkage reference value psisObtained by the following formula,
Figure BDA0003203517420000112
in the formula, #sIs a stator flux reference value, udFor the value of the DC network voltage, fsIs a stator voltage frequency reference.
Stator-side output power reference value PS *Obtained by the following formula:
PS *＝ksnr 2fs+Pcus
in the formula, ksTo set the coefficients, nrAs the rotational speed of the rotor, fsIs a stator voltage frequency reference, PcusThe stator copper loss.
And the control unit calculates and obtains a current stator flux linkage value and a stator side output power value according to current voltage and current values of the doubly-fed wind generator and the direct-current power grid.
The flux linkage equation:
ψs＝Lsisd+Lmird
in the formula psi s-stator flux linkage;
ls, Lm-dq coordinate system, self inductance of stator and mutual inductance between stator and rotor;
isd-stator current d-axis component;
ird-the d-axis component of the rotor current.
Under the dual motor convention, the stator flux linkage d axis is oriented downward, and the stator power equation is:
Figure BDA0003203517420000121
wherein Ps is stator power;
usd, Usq — stator voltage d-axis component and q-axis component;
isq — stator current q-axis component.
Step 3.2: the PI adjusting unit sequentially carries out PI adjustment on a stator flux linkage and a rotor current d-axis component of the doubly-fed wind generator, and the stator flux linkage and the rotor current d-axis component are fixedObtaining a rotor current d-axis component reference value i by sub-flux PI regulationrd *Obtaining a reference value u of the d-axis component of the rotor voltage by adjusting the d-axis component PI of the rotor currentrd *(ii) a Sequentially carrying out PI (proportional integral) regulation on the stator side output power and the rotor current q-axis component of the doubly-fed wind generator, and obtaining a rotor current q-axis component reference value i by carrying out PI regulation on the stator side output powerrq *Obtaining a reference value u of a q-axis component of the rotor voltage by adjusting the q-axis component PI of the rotor currentrq *。
And 4, step 4: reference value u of d-axis component of rotor voltagerd *Reference value u of q-axis component of rotor voltagerq *After coordinate transformation, a rotor voltage reference value u is obtainedra *、urb *、urc *And based on the rotor voltage reference value, the control unit outputs a PMW signal to control the rotor side converter RSC so as to control the charging and discharging of the energy storage device.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (10)

1. The utility model provides a direct current grid-connected type double-fed wind power generation system of rotor side energy storage, includes double-fed aerogenerator, energy memory, double-fed aerogenerator's rotor side connects energy memory through rotor side converter RSC, its characterized in that, double-fed aerogenerator's stator side bridges direct current electric wire netting through diode rectification, the system still includes:
the current sensor and the voltage sensor are respectively used for detecting the stator side current, the rotor side current and the stator side voltage of the doubly-fed wind generator;
the optical coded disc is used for detecting the rotor rotating speed of the doubly-fed wind generator;
the PI adjusting unit is used for carrying out PI adjustment on a stator flux linkage and stator side output power of the doubly-fed wind generator and outputting a rotor voltage reference value of the doubly-fed wind generator;
and the signal input end of the control unit is connected with the signal output ends of the current sensor, the voltage sensor and the optical code disc, and the control unit controls the rotor side converter RSC according to the rotor voltage reference value obtained by the PI regulating unit so as to control the charging and discharging of the energy storage device.
2. The rotor-side energy-storing direct-current grid-connected double-fed wind power generation system according to claim 1, characterized in that: the control unit determines a current reference value of the energy storage device according to the current wind parameter and the current energy storage device parameter; obtaining a current stator voltage frequency reference value of the doubly-fed wind generator according to a current rotor rotating speed and a current reference value of the energy storage device; and according to the current stator voltage frequency reference value, obtaining a rotor voltage reference value of the doubly-fed wind generator through PI regulation of the PI regulation unit.
3. The rotor-side energy-storing direct-current grid-connected double-fed wind power generation system according to claim 2, characterized in that: the control unit obtains a stator flux linkage reference value and a stator side output power reference value according to a current stator voltage frequency reference value; and the control unit calculates and obtains a current stator flux linkage value and a stator side output power value according to current voltage and current values of the doubly-fed wind generator and the direct-current power grid.
4. The rotor-side energy-storing direct-current grid-connected double-fed wind power generation system according to claim 3, characterized in that: the PI regulation unit sequentially carries out PI regulation on a stator flux linkage and a rotor current d-axis component of the doubly-fed wind generator to obtain a rotor voltage d-axis component reference value; and sequentially carrying out PI regulation on the stator side output power and the rotor current q-axis component of the doubly-fed wind generator to obtain a rotor voltage q-axis component reference value.
5. The rotor-side energy-storing direct-current grid-connected double-fed wind power generation system according to claim 1, characterized in that: and the control unit is in communication connection with the PI regulating unit.
6. The rotor-side energy-storing direct-current grid-connected double-fed wind power generation system according to claim 1, characterized in that: the diode rectifier bridge is an uncontrollable diode rectifier bridge, so that the stator side of the doubly-fed wind driven generator outputs power in a single direction, and the doubly-fed wind driven generator is in a super-synchronous power generation running state or a sub-synchronous power generation running state.
7. A method for controlling a dc grid-connected doubly-fed wind power generation system with energy storage at the rotor side according to claim 1, comprising the steps of:
step 1: obtaining stator side current, rotor side current and stator side voltage of the doubly-fed wind generator through a current sensor and a voltage sensor; obtaining the rotating speed of the rotor of the doubly-fed wind generator through an optical code disc;
step 2: determining a current reference value of the energy storage device according to the current wind power parameter and the current energy storage device parameter; obtaining a current stator voltage frequency reference value according to the current rotor rotating speed and the current reference value of the energy storage device;
and step 3: obtaining a rotor voltage reference value of the doubly-fed wind generator through PI regulation according to a current stator voltage frequency reference value;
and 4, step 4: and according to the rotor voltage reference value, the control unit outputs a PMW signal to control the rotor side converter RSC so as to control the charging and discharging of the energy storage device.
8. The control method according to claim 7, characterized in that: in step 2, the current stator voltage frequency reference value is obtained by the following formula:
Figure FDA0003203517410000031
in the formula, nrAs the rotor speed, PnIs the number of pole pairs of the motor, fsIs a stator voltage frequency reference, PcusFor stator copper loss, PcurFor rotor copper loss, IbIs a reference value of the current of the energy storage device, UbIs the reference value of the energy storage device voltage, ksTo set the coefficients.
9. The control method according to claim 7, characterized in that: step 2, when the current charge amount of the energy storage device is within a normal range, determining a current reference value of the energy storage device, so that the doubly-fed wind power generator tracks the maximum wind energy and works in a power generation operation mode;
when the current charge amount of the energy storage device is lower than a normal range, determining a current reference value of the energy storage device, so that the energy storage device is charged, and the doubly-fed wind driven generator is in a super-synchronous power generation running state;
and when the current charge amount of the energy storage device is higher than the normal range, determining the current reference value of the energy storage device, so that the energy storage device discharges, and the doubly-fed wind driven generator is in a sub-synchronous power generation running state.
10. The control method according to claim 7, wherein the step 3 includes the steps of:
step 3.1: the control unit obtains a stator flux linkage reference value and a stator side output power reference value according to a current stator voltage frequency reference value;
stator flux linkage reference value psisObtained by the following formula,
Figure FDA0003203517410000041
in the formula, #sIs a stator flux reference value, udFor the value of the DC network voltage, fsIs a stator voltage frequency reference;
stator-side output power reference value PS *Obtained by the following formula:
PS *＝ksnr 2fs+Pcus
in the formula, ksTo set the coefficients, nrAs the rotational speed of the rotor, fsIs a stator voltage frequency reference, PcusThe stator copper loss is considered;
step 3.2: the PI regulation unit sequentially carries out PI regulation on a stator flux linkage and a rotor current d-axis component of the doubly-fed wind generator to obtain a rotor voltage d-axis component reference value; and sequentially carrying out PI regulation on the stator side output power and the rotor current q-axis component of the doubly-fed wind generator to obtain a rotor voltage q-axis component reference value.
CN202110911429.6A 2021-08-09 2021-08-09 Direct-current grid-connected double-fed wind power generation system with energy stored at rotor side and control method thereof Pending CN113517683A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114244211A (en) * 2021-12-27 2022-03-25 华北电力大学 Wide-voltage-frequency range control system and method for offshore double-fed wind power generation system
CN114244210A (en) * 2021-12-27 2022-03-25 华北电力大学 Double-fed wind power generation system based on thyristor medium-voltage direct current access and control method
CN114244211B (en) * 2021-12-27 2024-04-26 华北电力大学 Wide-voltage-frequency range control system and method for offshore doubly-fed wind power generation system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114244211A (en) * 2021-12-27 2022-03-25 华北电力大学 Wide-voltage-frequency range control system and method for offshore double-fed wind power generation system
CN114244210A (en) * 2021-12-27 2022-03-25 华北电力大学 Double-fed wind power generation system based on thyristor medium-voltage direct current access and control method
CN114244210B (en) * 2021-12-27 2024-04-16 华北电力大学 Doubly-fed wind power generation system based on thyristor medium-voltage direct current access and control method
CN114244211B (en) * 2021-12-27 2024-04-26 华北电力大学 Wide-voltage-frequency range control system and method for offshore doubly-fed wind power generation system

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