CN111342491B - A grid-connected control method and system suitable for a flywheel energy storage device - Google Patents

A grid-connected control method and system suitable for a flywheel energy storage device Download PDF

Info

Publication number
CN111342491B
CN111342491B CN202010203447.4A CN202010203447A CN111342491B CN 111342491 B CN111342491 B CN 111342491B CN 202010203447 A CN202010203447 A CN 202010203447A CN 111342491 B CN111342491 B CN 111342491B
Authority
CN
China
Prior art keywords
voltage
output
grid
flywheel
axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010203447.4A
Other languages
Chinese (zh)
Other versions
CN111342491A (en
Inventor
陈霞
许振宇
石梦璇
周建宇
文劲宇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huazhong University of Science and Technology
Original Assignee
Huazhong University of Science and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huazhong University of Science and Technology filed Critical Huazhong University of Science and Technology
Priority to CN202010203447.4A priority Critical patent/CN111342491B/en
Publication of CN111342491A publication Critical patent/CN111342491A/en
Application granted granted Critical
Publication of CN111342491B publication Critical patent/CN111342491B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/12—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load by adjustment of reactive power
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/30—Arrangements for balancing of the load in a network by storage of energy using dynamo-electric machines coupled to flywheels
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/36—Arrangements for transfer of electric power between AC networks via a high-tension DC link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/36—Arrangements for transfer of electric power between AC networks via a high-tension DC link
    • H02J2003/365—Reducing harmonics or oscillations in HVDC
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Inverter Devices (AREA)

Abstract

本发明公开了一种适用于飞轮储能装置的并网控制方法及系统，属于电气工程技术领域，本发明提供的电压控制模块使直流侧实际电压跟随直流侧电压预设值，获取飞轮侧q轴电流参考值；电流控制模块使飞轮侧d轴输出电流和q轴输出电流分别跟随飞轮侧d轴电流参考值和q轴电流参考值，获取飞轮侧d轴电压参考值和q轴电压参考值；电路实际物理量能够很好地跟踪控制器参考值，使并网系统具有良好的响应特性；电网侧控制单元构建的频率‑有功控制方程和电压‑无功控制方程，能够快速响应电网频率和电压的变化；本发明解决了现有并网装置无法使用飞轮储能装置快速响应电网变化进行电压调节和频率调节的技术问题。

Figure 202010203447

The invention discloses a grid-connected control method and system suitable for a flywheel energy storage device, and belongs to the technical field of electrical engineering. The voltage control module provided by the invention makes the actual voltage of the DC side follow the preset value of the voltage of the DC side, and obtains the q of the flywheel side. Shaft current reference value; the current control module makes the flywheel side d-axis output current and q-axis output current follow the flywheel side d-axis current reference value and q-axis current reference value respectively, and obtain the flywheel side d-axis voltage reference value and q-axis voltage reference value ;The actual physical quantity of the circuit can track the reference value of the controller well, so that the grid-connected system has good response characteristics; the frequency-active power control equation and voltage-reactive power control equation constructed by the grid-side control unit can quickly respond to grid frequency and voltage. The invention solves the technical problem that the existing grid-connected device cannot use the flywheel energy storage device to quickly respond to grid changes for voltage regulation and frequency regulation.

Figure 202010203447

Description

Grid-connected control method and system suitable for flywheel energy storage device
Technical Field
The invention belongs to the technical field of electrical engineering, and particularly relates to a grid-connected control method and system suitable for a flywheel energy storage device.
Background
In recent years, with the large-scale application of novel power generation technologies such as wind power generation and solar power generation, the main position of a synchronous generator on the power generation side is gradually reduced, on one hand, the traditional rotation standby is reduced, on the other hand, a power electronic converter is used as an interface of a novel power generation unit connected to a power grid, the characteristic of quick response of the power electronic converter and the randomness and the intermittence of the novel power generation unit bring great fluctuation to the power grid, the inertia of the system is obviously reduced, and the safe and stable operation of the system is influenced. The energy storage device can stabilize the fluctuation of renewable energy sources by means of the quick response characteristic of the converter and adopting a proper control method, so that the energy storage device contributes inertia to a power grid, the frequency regulation capacity of the power grid is improved, the immunity of the power grid is enhanced, and the stability problem caused by the high permeability of new energy components of an alternating current power system is solved.
The existing energy storage grid-connected system mainly adopts the forms of storage battery energy storage, super capacitor energy storage and the like, the storage battery energy storage technology is mature, the energy storage efficiency is higher, but the charging and discharging time is long, and the service life is short. Compared with storage battery energy storage, the super capacitor has the characteristics of high power density, high charging speed, long cycle life and the like, but the single super capacitor is low in voltage and needs to be used in parallel, and the problem of unbalanced working voltage is easily caused when the capacitor parameters are inconsistent, so that the service life and the reliability of the system are influenced. The existing energy storage grid connection control method adopts a PI controller to regulate grid connection current, multiple coordinate rotation transformation is required in the process, the control method is complex, and meanwhile, the dynamic response of the PI controller is too fast, so that the power factor output by a converter is influenced, and the electric energy quality of a system is reduced.
The flywheel energy storage is a technology for storing electric energy through a physical method, the energy storage capacity is mainly determined by the rotational inertia, the power density and the capacity density are large, the system stability determined by the inertia is strong, frequent maintenance is not needed, the response speed is in the minute level, and the flywheel energy storage is suitable for peak regulation and frequency modulation, improving the electric energy quality of a power grid and improving the stability of the power grid, has certain superiority compared with other energy storage devices, and is suitable for regulating the frequency of the power grid. The existing flywheel energy storage system mainly uses an AC-DC-AC two-converter topological structure, and a flywheel side circuit and a power grid side circuit of the flywheel energy storage system are completely decoupled after energy conversion of a DC side without the constraint of a specific control method, so that inertia is difficult to contribute to a power grid by using a flywheel device to adjust frequency.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a grid-connected control method and a grid-connected control system suitable for a flywheel energy storage device, and aims to solve the technical problem that the conventional grid-connected device cannot use the flywheel energy storage device to quickly respond to the change of a power grid to adjust voltage and frequency.
In order to achieve the above object, in a first aspect, the present invention provides a grid-connected control method suitable for a flywheel energy storage device, which specifically includes the following steps:
the output voltage of the flywheel side is controlled by a phase-locked loop to obtain the working frequency of a circuit of the flywheel side;
according to the working frequency of a flywheel side circuit, decomposing a flywheel side output current into a flywheel side d-axis output current and a flywheel side q-axis output current by adopting a park transformation formula;
after the difference is made between the d-axis output current of the flywheel side and the d-axis current reference value of the flywheel side, the d-axis voltage reference value of the flywheel side is output through PI control;
performing PI control after the difference is made between the actual voltage of the direct current side and the set value of the voltage of the direct current side, and outputting a reference value of q-axis current of the flywheel side; performing PI control after a difference is made between a flywheel side q-axis current reference value and a flywheel side q-axis output current, and outputting a flywheel side q-axis voltage reference value;
performing park inverse transformation on the flywheel side d-axis voltage reference value and the flywheel side q-axis voltage reference value based on the working frequency of a flywheel side circuit to obtain a flywheel side three-phase alternating current voltage reference value;
sending the reference value of the three-phase alternating voltage at the flywheel side into an SVPWM (space Vector Pulse Width modulation) signal generator to obtain a PWM (Pulse Width modulation) signal of a converter at the flywheel side;
driving each switching tube of the flywheel side converter to be switched off by utilizing a PWM signal of the flywheel side converter, converting the flywheel side alternating current into direct current of a direct current side, stabilizing the actual voltage of the direct current side through a parallel capacitor, and updating the actual voltage of the direct current side;
monitoring the frequency of the output voltage in real time, regulating the output active power output to the power grid according to a frequency-active control equation, and integrating the frequency of the output voltage to obtain phase data;
monitoring an output voltage effective value in real time, adjusting output reactive power output to a power grid according to a voltage-reactive power control equation, and collecting the output quantity of the voltage-reactive power control equation;
sine is taken for the phase data, the sine is multiplied by the output quantity of a voltage-reactive power control equation, and the phase translation is carried out on the multiplication result to obtain a symmetrical three-phase alternating current voltage reference value at the power grid side;
sending the symmetrical three-phase alternating current voltage reference values of the power grid side into an SVPWM signal generator to obtain PWM signals for controlling a power grid side converter;
driving each switching tube of the grid-side converter by using a PWM signal of the grid-side converter, and converting the updated actual voltage of the direct current side into an alternating current quantity of the grid side;
the high order harmonic wave of the alternating current quantity at the power grid side is removed through LCL filtering, and three-phase symmetrical filtered voltage u is obtainedi(i＝a,b,c)；
Inputting three-phase symmetrical sine waves into an alternating current power grid to complete energy exchange between a direct current side and the power grid side.
Preferably, the method for constructing the frequency-active control equation and the voltage-reactive control equation of the grid-side converter is as follows:
calculating the output active power, the output reactive power, the output voltage effective value and the output voltage frequency of a power grid side control unit by detecting the power grid current and the filtered voltage in the three-phase intersection flow at the power grid side;
constructing a frequency-active control equation of the power grid side converter according to the output active power, the output voltage frequency, the active power set value, the rated voltage frequency, the virtual moment of inertia and the active adjustment coefficient of the power grid side control unit;
and constructing a voltage-reactive power control equation of the power grid side converter according to the output reactive power, the output voltage effective value, the reactive power set value, the rated voltage, the virtual voltage regulation coefficient and the reactive power regulation output voltage effective value coefficient of the power grid side control unit.
Based on the grid-connected control method suitable for the flywheel energy storage device, on the other hand, the invention provides a grid-connected control system suitable for the flywheel energy storage device, which comprises the following steps: the system comprises a flywheel side control unit, a power grid side control unit and a data processing module;
the flywheel side control unit comprises a voltage control module, a current control module and an SVPWM signal generator; the voltage control module is used for performing PI control after the difference is made between the actual voltage of the direct current side and the set voltage value of the direct current side, and outputting a flywheel side q-axis current reference value; the current control module is used for carrying out PI control after the difference is made between the d-axis output current of the flywheel side and the d-axis current reference value of the flywheel side, and outputting a d-axis voltage reference value of the flywheel side; performing PI control after a difference is made between the flywheel side q-axis current reference value and the flywheel side q-axis output current, and outputting a flywheel side q-axis voltage reference value; the SVPWM is used for receiving three-phase alternating voltage reference values of a flywheel side and a power grid side and respectively acquiring PWM signals of a flywheel side converter and a power grid side converter;
the power grid side control unit comprises an active control module and a reactive control module; the active control module is used for receiving the output voltage frequency, regulating the output active power according to a frequency-active control equation and integrating the output voltage frequency to obtain phase data; the reactive power control module is used for receiving the effective value of the output voltage, regulating the output reactive power according to a voltage-reactive power control equation and collecting the output quantity of the voltage-reactive power control equation;
the data processing module is used for obtaining a three-phase alternating current voltage reference value of the flywheel side according to the d-axis voltage reference value and the q-axis voltage reference value of the flywheel side and the working frequency of a circuit of the flywheel side; and the method is used for acquiring the three-phase alternating current voltage reference value of the power grid side according to the phase data and the output quantity of the voltage-reactive control equation.
Preferably, the data processing module is further configured to calculate an output active power, an output reactive power, an output voltage effective value, and an output voltage frequency of the grid-side control unit through a grid current and a filtered voltage in the grid-side three-phase intersection flow;
constructing a frequency-active control equation of the power grid side converter according to the output active power, the output voltage frequency, the active power set value, the rated voltage frequency, the virtual moment of inertia and the active adjustment coefficient of the power grid side control unit;
and constructing a voltage-reactive power control equation of the power grid side converter according to the output reactive power, the output voltage effective value, the reactive power set value, the rated voltage, the virtual voltage regulation coefficient and the reactive power regulation output voltage effective value coefficient of the power grid side control unit.
Preferably, the frequency-active control equation is:
Figure BDA0002420153410000051
wherein, PeTo output active power; omega is the output voltage frequency; psetIs an active power set value; omeganIs a rated voltage frequency; j. the design is a squarevIs a virtual moment of inertia; dpThe active adjustment coefficient;
preferably, the voltage-reactive control equation is:
Figure BDA0002420153410000052
wherein Q iseThe output reactive power of the power grid side control unit is obtained; u is an effective value of the output voltage; qsetIs a reactive power set value; u shapenIs a rated voltage; k is a virtual voltage regulation coefficient; dqIs a reactive power adjustment coefficient; and e is the output quantity of the voltage-reactive power control equation.
Generally, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:
(1) the flywheel side control unit provided by the invention adopts a PI control mode, after each PI control parameter is determined, on one hand, a voltage control module can enable a direct current side actual voltage to follow a direct current side voltage preset value to obtain a flywheel side q-axis current reference value, and on the other hand, a current control module can enable a flywheel side d-axis output current and a flywheel side q-axis output current to respectively follow the flywheel side d-axis current reference value and the flywheel side q-axis current reference value to obtain a flywheel side d-axis voltage reference value and a flywheel side q-axis voltage reference value.
(2) The frequency-active control equation constructed by the power grid side control unit provided by the invention can quickly respond to the change of the power grid frequency, and can reduce or increase the active power of the energy storage system according to the increase or decrease of the power grid frequency, so that the mechanical inertia of the flywheel rotor is converted into the inertia of the power system through the integral control method and system, and the frequency regulation of the power grid is realized.
(3) The voltage-reactive power control equation constructed by the power grid side control unit provided by the invention can quickly respond to the voltage change of the power grid, and the converter can reduce or increase reactive power according to the increase or decrease of the voltage amplitude of the power grid, so that the voltage regulation of the power grid is realized.
(4) The power grid side control unit provided by the invention does not use a traditional double-loop control method, does not need to carry out rotation coordinate transformation, and is low in control complexity, simple in calculation and easy for engineering realization.
Drawings
FIG. 1 is a schematic diagram of a grid-connected control system for a flywheel energy storage device provided by the invention;
FIG. 2 is a schematic diagram of a converter topology of a flywheel energy storage device provided by an embodiment;
FIG. 3 is a schematic control diagram of the flywheel side provided by the embodiment;
FIG. 4 is a schematic diagram of grid-side control provided by an embodiment;
FIG. 5(a) is a schematic diagram of the embodiment providing a 0.5Hz drop in AC grid frequency at 3 s;
FIG. 5(b) is a transient response process of increasing active power of the flywheel energy storage device in FIG. 5(a) according to the embodiment;
FIG. 6(a) is a schematic diagram of the embodiment which provides a 3% reduction of the effective value of the AC power grid voltage in 2.5 s;
fig. 6(b) is a transient response process of the flywheel energy storage device for increasing reactive power in fig. 6(a) according to the embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, the present invention provides a grid-connected control method and system suitable for a flywheel energy storage device, wherein the grid-connected control system is mainly divided into three parts, specifically, a flywheel side control unit, a grid side control unit and a data processing module; the flywheel energy storage device is mainly divided into three parts, specifically, a flywheel side, a direct current side and a power grid side.
The invention provides a grid-connected control method suitable for a flywheel energy storage device, which specifically comprises the following steps:
carrying out PI control after the difference is made between the d-axis output current of the flywheel side and the d-axis current reference value of the flywheel side, and outputting a d-axis voltage reference value of the flywheel side; performing PI control after the difference is made between the actual voltage of the direct current side and the set voltage of the direct current side, performing PI control after the difference is made between the output q-axis current reference value of the flywheel side and the q-axis output current of the flywheel side, and outputting a q-axis voltage reference value of the flywheel side;
acquiring a PWM signal of a flywheel side converter by utilizing an SVPWM signal generator according to the voltage reference values of a d axis and a q axis of the flywheel side and the working frequency of a flywheel side circuit;
updating the actual voltage of the direct current side by using a PWM signal of a flywheel side converter;
monitoring the frequency of the output voltage in real time, adjusting the output active power according to a frequency-active control equation, and integrating the frequency of the output voltage to obtain phase data; monitoring an output voltage effective value in real time, adjusting output reactive power according to a voltage-reactive power control equation, and collecting the output quantity of the voltage-reactive power control equation;
according to the phase data and the output quantity of the voltage-reactive power control equation, a SVPWM signal generator is utilized to obtain a PWM signal of the converter on the power grid side;
driving a switch tube of a grid-side converter by using a PWM signal of the grid-side converter to realize energy conversion between a direct current side and a power grid side, obtaining an alternating current quantity of the power grid side, and inputting the alternating current quantity into an alternating current grid after the alternating current quantity is filtered by an LCL;
the energy conversion between the direct current side and the power grid side is mainly to convert the updated actual voltage of the direct current side into the alternating current of the power grid side.
Preferably, the method for acquiring the output currents of the d-axis and the q-axis on the flywheel side comprises the following steps:
the output voltage of the flywheel side is controlled by a phase-locked loop to obtain the working frequency omega of the flywheel side circuitf；
According to the working frequency of the flywheel side circuit, a park transformation formula is adopted to decompose the flywheel side output current into flywheel side d-axis and q-axis output currents.
Preferably, the method for constructing the frequency-active control equation and the voltage-reactive control equation of the grid-side converter is as follows:
calculating the output active power, the output reactive power, the output voltage effective value and the output voltage frequency of a power grid side control unit by detecting the power grid current and the filtered voltage in the three-phase symmetrical alternating current at the power grid side;
constructing a frequency-active control equation of the power grid side converter according to the output active power, the output voltage frequency, the active power set value, the rated voltage frequency, the virtual moment of inertia and the active adjustment coefficient of the power grid side control unit;
and constructing a voltage-reactive power control equation of the power grid side converter according to the output reactive power, the output voltage effective value, the reactive power set value, the rated voltage, the virtual voltage regulation coefficient and the reactive power regulation output voltage effective value coefficient of the power grid side control unit.
Preferably, the method for acquiring the PWM signal of the flywheel-side converter comprises:
performing park inverse transformation on the flywheel side d-axis voltage reference value and the flywheel side q-axis voltage reference value based on the working frequency of a flywheel side circuit to obtain a flywheel side three-phase alternating current voltage reference value;
and sending the three-phase alternating-current voltage reference value of the flywheel side into an SVPWM signal generator to obtain PWM signals (PWM signals of the flywheel side converter) for driving each switching tube of the flywheel side converter.
Preferably, the method for acquiring the PWM signal of the grid-side converter includes:
sine is taken for the phase data, the sine is multiplied by the output quantity of a voltage-reactive power control equation, and the phase translation is carried out on the multiplication result to obtain a symmetrical three-phase alternating current voltage reference value at the power grid side;
and sending the symmetrical three-phase alternating-current voltage reference values of the power grid side into an SVPWM signal generator to obtain PWM signals (PWM signals of the power grid side converter) for driving each switching tube of the power grid side converter.
Based on the grid-connected control method suitable for the flywheel energy storage device, the invention provides a corresponding grid-connected control system, which comprises the following steps: the system comprises a flywheel side control unit, a power grid side control unit and a data processing module;
the flywheel side control unit comprises a voltage control module, a current control module and an SVPWM signal generator; the voltage control module is used for performing PI control after the difference is made between the actual voltage of the direct current side and the set voltage value of the direct current side, and outputting a flywheel side q-axis current reference value; the current control module is used for carrying out PI control after the difference is made between the d-axis output current of the flywheel side and the d-axis current reference value of the flywheel side, and outputting a d-axis voltage reference value of the flywheel side; performing PI control after a difference is made between the flywheel side q-axis current reference value and the flywheel side q-axis output current, and outputting a flywheel side q-axis voltage reference value; the SVPWM is used for receiving three-phase alternating voltage reference values of a flywheel side and a power grid side and respectively acquiring PWM signals of a flywheel side converter and a power grid side converter;
the power grid side control unit comprises an active control module and a reactive control module; the active control module is used for receiving the output voltage frequency, regulating the output active power according to a frequency-active control equation and integrating the output voltage frequency to obtain phase data; the reactive power control module is used for receiving the effective value of the output voltage, regulating the output reactive power according to a voltage-reactive power control equation and collecting the output quantity of the voltage-reactive power control equation;
the data processing module is used for obtaining a three-phase alternating current voltage reference value of the flywheel side according to the d-axis voltage reference value and the q-axis voltage reference value of the flywheel side and the working frequency of a circuit of the flywheel side; and the method is used for acquiring the three-phase alternating current voltage reference value of the power grid side according to the phase data and the output quantity of the voltage-reactive control equation.
Preferably, the data processing module is further configured to calculate an output active power, an output reactive power, an output voltage effective value, and an output voltage frequency of the grid-side control unit through a grid current and a filtered voltage in the grid-side three-phase intersection flow;
constructing a frequency-active control equation of the power grid side converter according to the output active power, the output voltage frequency, the active power set value, the rated voltage frequency, the virtual moment of inertia and the active adjustment coefficient of the power grid side control unit;
and constructing a voltage-reactive power control equation of the power grid side converter according to the output reactive power, the output voltage effective value, the reactive power set value, the rated voltage, the virtual voltage regulation coefficient and the reactive power regulation output voltage effective value coefficient of the power grid side control unit.
Preferably, the frequency-active control equation is:
Figure BDA0002420153410000091
wherein, PeTo output active power; omega is the output voltage frequency; psetIs an active power set value; omeganIs a rated voltage frequency; j. the design is a squarevIs a virtual moment of inertia; dpThe active adjustment coefficient;
preferably, the voltage-reactive control equation is:
Figure BDA0002420153410000101
wherein Q iseThe output reactive power of the power grid side control unit is obtained; u is an effective value of the output voltage; qsetIs a reactive power set value; u shapenIs a rated voltage; k is a virtual voltage regulation coefficient; dqIs a reactive power adjustment coefficient; and e is the output quantity of the voltage-reactive power control equation.
Examples
As shown in fig. 2, the whole flywheel energy storage device comprises a flywheel side module, a direct current side module and a power grid side module; the flywheel side module is connected with the flywheel; the grid-side module is connected to an ac grid, in this embodiment the ac grid is referred to using an ideal three-phase ac source.
Based on the flywheel energy storage device, the grid-connected control method of the flywheel energy storage device provided by the embodiment is specifically described below.
For the flywheel energy storage device, the control target of the grid-connected control method for the flywheel energy storage device provided by this embodiment is to stabilize the output voltage frequency ω of the grid-side module in the flywheel energy storage device at the reference value 50Hz, stabilize the output voltage effective value U at the reference value 380V, and output the active power PeStabilized at a reference value of 8kW, and output reactive power QeThe power is stabilized at 12.5kW, and power support is provided for an alternating current power grid; according to the active power adjustment coefficient DpThe output active power is reduced along with the rising of the frequency of the alternating current power grid and increased along with the falling of the frequency of the alternating current power grid; according to the reactive power regulation coefficient DqThe output reactive power is reduced along with the increase of the voltage effective value of the alternating current power grid, and is increased along with the decrease of the voltage effective value of the alternating current power grid.
FIG. 3 is a schematic diagram of a flywheel-side control unit including a d-axis control module and a q-axis control module provided by an embodiment; the d-axis control module is used for determining d-axis current PI control on the flywheel side, subtracting d-axis output current on the flywheel side from a d-axis current reference value on the flywheel side, and obtaining a d-axis voltage reference value u on the flywheel side through the PI controllerfq(ii) a The outer ring control of the q-axis control module is direct-current side actual voltage PI control, and the inner ring control is a q-axis current control ring; the whole process is as follows: the actual voltage of the direct current side is differenced with the set voltage value of the direct current side, and the difference result is obtained through a PI (proportional integral) controller to obtain a q-axis current reference value of the flywheel side; the reference value of q-axis current of the flywheel side is differed with the reference value of q-axis output current of the flywheel side, and the reference value u of q-axis voltage of the flywheel side is obtained through PI controlfq(ii) a The working frequency omega of the flywheel side d-axis voltage reference value and the flywheel side q-axis voltage reference value passing through the flywheel side circuitfAnd performing inverse park transformation to obtain a flywheel side three-phase alternating-current voltage reference value, sending the flywheel side three-phase alternating-current voltage reference value to the SVPWM signal generator, and obtaining PWM signals for driving each switching tube of the flywheel side converter.
FIG. 4 shows electricity provided by the embodimentThe core of the schematic diagram of the network side control unit comprises a frequency-active control equation and a voltage-reactive control equation; wherein, the frequency-active control process is as follows: when the frequency of the power grid is reduced, the output frequency omega of the control unit on the power grid side is reduced, and the output active power P on the left side of the equation can be known according to the frequency-active control equationeIncreasing, namely increasing active power to a power grid; when the frequency of the power grid is increased, the change is opposite, and active power is reduced to the power grid; in the whole control process, the output power omega of the power grid side control unit passes through the integrator in real time to obtain phase data theta; the voltage-reactive power control process comprises the following steps: when the amplitude of the voltage of the power grid is reduced, the effective value U of the output voltage of the power grid side control unit is reduced, and the output reactive power Q on the left side of the equation can be known according to a voltage-reactive power control equationeIncreasing, namely increasing reactive power to the power grid; when the amplitude of the voltage of the power grid is increased, the change is opposite, and reactive power is reduced to the power grid.
In this embodiment, the values of the parameters of each controller are as follows:
parameters of the flywheel-side control unit: the d-axis control module: k is a radical offdip＝1，kfdii10; a q-axis control module: k is a radical offqip＝0.8，kfqii＝10，kfqup＝5.5，kfqui＝1；
Parameters of the grid-side control unit: frequency-active control equation: j. the design is a squarev＝0.1kg/m2，Dp5 Nm.s/rad; voltage-reactive control equation: k is 10 A.s, Dq＝100var/V。
Correspondingly, the grid-connected control method suitable for the flywheel energy storage device provided by the embodiment specifically comprises the following steps:
(1) flywheel-side output voltage ufa、ufb、ufcObtaining the working frequency omega of the flywheel side circuit after the control of the phase-locked loopf；
(2) According to the operating frequency omega of the flywheel-side circuitfThe three-phase flywheel side output current i is converted by a park conversion formulafi(i ═ a, b, c) decomposed into ifd、ifq(ii) a The specific process is as follows:
Figure BDA0002420153410000121
wherein ifa、ifbAnd ifcRespectively outputting current for a phase a, a phase b and a phase c on the flywheel side; i.e. ifd、ifqAnd if0Outputting current for a d axis, a q axis and a 0 axis of the flywheel side respectively; omegafThe working frequency of the flywheel side circuit; theta0Is ifaAnd ifdThe included angle of (a), namely the initial phase angle of the flywheel;
the following is the control process for the decoupling of the output current at the flywheel side dq: d-axis control module controls output current i of d-axis on flywheel sidefd(see step (3.1)), the q-axis control module controls the DC side voltage udcAnd the output current i of the q axis on the flywheel sidefq(see step (3.2));
(3.1) outputting current i from d-axis on flywheel sidefdAnd d-axis current reference value i on flywheel sidefdrefAfter difference is made, a d-axis voltage reference value u of the flywheel side is output through PI controlfd(ii) a The concrete form is as follows:
ufd＝kfdip(ifdref-ifd)+kfdii∫(ifdref-ifd)dt
wherein k isfdipThe d-axis current proportionality coefficient of the flywheel side is obtained; k is a radical offdiiD-axis current integral coefficient at the flywheel side;
(3.2) applying the actual DC voltage udcAnd a DC side voltage set value urefPerforming PI control after difference, and outputting a flywheel side q-axis current reference value ifqref(ii) a The concrete form is as follows:
ifqref＝kfqup(uref-udc)+kfqui∫(uref-udc)dt
wherein k isfqupIs the proportional coefficient of the q-axis voltage at the flywheel side; k is a radical offquiThe integral coefficient of the q-axis voltage at the flywheel side is used; u. ofrefIs a set value of the voltage at the direct current side; u. ofdcThe actual voltage of the direct current side;
reference value i of q-axis current of flywheel sidefqrefOutput current i of q axis on flywheel sidefqPerforming PI control after difference to output a flywheel side q-axis voltage reference value ufq(ii) a The concrete form is as follows:
ufq＝kfqip(ifqref-ifq)+kfqii∫(ifqref-ifq)dt
wherein k isfqipIs the current proportionality coefficient of the q axis at the flywheel side; k is a radical offqiiThe integral coefficient of the current of the q axis at the flywheel side is taken as the integral coefficient;
(4) reference value u of d-axis voltage of flywheel sidefdWith reference value u of the flywheel side q-axis voltagefqWorking frequency omega based on flywheel side circuitfInverse park transformation of the flywheel to obtain a flywheel-side three-phase alternating voltage reference value ufrefi(i＝a,b,c)；
(5) Reference value u of three-phase alternating voltage on flywheel sidefrefiSending the signals into an SVPWM signal generator to obtain PWM signals (PWM signals of the flywheel side converter) for driving each switching tube of the flywheel side converter;
(6) the PWM signal of the flywheel side converter is used for driving the flywheel side converter to convert the flywheel side alternating current into direct current of a direct current side, and a parallel capacitor C is used for converting the direct current into direct currentdcStabilizing the DC-side actual voltage, and updating the DC-side actual voltage udc；
(7) By detecting the power grid current i in the three-phase symmetrical alternating current on the power grid sidegi(i ═ a, b, c) and the filtered voltage ui(i ═ a, b, c), calculating the output active power P of the grid-side control uniteAnd output reactive power QeAn output voltage effective value U and an output voltage frequency omega;
the following are a frequency-active control process (see steps 8.1-8.2) and a voltage-reactive control process (see steps 8.3-8.4);
(8.1) according to the output active power P of the power grid side control uniteFrequency of output voltage omega, active power set value PsetRated voltage frequency omeganVirtual moment of inertia JvAnd active power adjustment coefficient DpConstructing a frequency-active control equation of the power grid side converter; the concrete form is as follows:
Figure BDA0002420153410000131
wherein, PeTo output active power; omega is the output voltage frequency; psetIs an active power set value; omeganIs a rated voltage frequency; j. the design is a squarevIs a virtual moment of inertia; dpThe active adjustment coefficient;
(8.2) monitoring the output voltage frequency omega in real time, and regulating the output active power P output to the power grid according to a frequency-active control equationeIntegrating the output voltage frequency omega to obtain phase data theta;
specifically, when the grid frequency decreases, the output voltage frequency ω of the grid-side control unit decreases according to the circuit relationship, and the nominal voltage power ω on the left side of the equation of the frequency-active control equationnThe difference with the output voltage frequency ω of the grid side control unit increases and the derivative of the frequency regulation on the right of the equation changes from 0 to a negative number, so that the output active power P on the left of the equation for the equality work to be establishedeIncreasing, namely increasing active power to a power grid; when the frequency of the power grid is increased, the change is opposite, and active power is reduced to the power grid;
(8.3) controlling the output reactive power Q of the unit according to the electric network sideeOutput voltage effective value U, reactive power set value QsetRated voltage UnVirtual voltage regulation coefficient K and reactive power regulation output voltage effective value coefficient DqThe method comprises the following steps of constructing a voltage-reactive power control equation of the grid-side converter, specifically:
Figure BDA0002420153410000141
wherein Q iseThe output reactive power of the power grid side control unit is obtained; u is an effective value of the output voltage; qsetIs a reactive power set value; u shapenIs a rated voltage; k is a virtual voltage regulation coefficient; dqIs a reactive power adjustment coefficient; e is the output quantity of the voltage-reactive power control equation;
(8.4) real-time supervisionMeasuring the effective value of the output voltage, and regulating the output reactive power Q output to the power grid according to the voltage-reactive power control equationeCollecting the output quantity of a voltage-reactive power control equation;
specifically, when the amplitude of the grid voltage is reduced, according to the circuit relationship, the effective value U of the output voltage of the grid-side control unit is reduced, and the right rated voltage U of the equation of the voltage-reactive power control equation is reducednThe difference from the output voltage root is increased and the derivative of the output e of the voltage-reactive control equation on the right of the equation is constant, so that the output reactive power Q on the left of the equation is such that the equation workseIncreasing, namely increasing reactive power to the power grid; when the voltage amplitude of the power grid is increased, the change is opposite, and reactive power is reduced to the power grid;
(9) sine is taken for the phase data theta, the sine is multiplied by the output quantity e of a voltage-reactive power control equation, and the multiplication result is subjected to phase translation to obtain symmetrical three-phase alternating voltage reference values esin (theta +120 degrees), esin theta and esin (theta-120 degrees) on the power grid side;
(10) sending the symmetrical three-phase alternating voltage reference value of the power grid side into an SVPWM (space Vector Pulse Width modulation) signal generator to obtain PWM signals (PWM signals of the power grid side converter) for driving each switching tube of the power grid side converter;
(11) driving each switching tube of the grid-side converter by utilizing a PWM (pulse-width modulation) signal of the grid-side converter, and converting direct-current side direct current into alternating current of a grid side;
(12) removing higher harmonics from the AC value of the power grid side by LCL filtering to obtain three-phase symmetrical sine wave voltage ui(i＝a,b,c)；
(13) Inputting three-phase symmetrical sine waves into an alternating current power grid for energy exchange.
The process of increasing the active power of the system when the grid frequency is reduced is verified in the PSCAD/EMTDC software, and the simulation result in the case is shown in FIG. 5 (comprising FIG. 5(a) and FIG. 5 (b)). Fig. 5(a) shows that the grid frequency is reduced by 0.5Hz at 3s, and at this time, fig. 5(b) shows that the output active power of the grid-connected control system of the flywheel energy storage device is increased by 5kW, and the output active power is stable at a new balance point in about 3.5 s. From the above analysis, it can be known that the grid-connected control method provided by the embodiment can increase the output active power of the energy storage system after the frequency of the power grid decreases so as to adjust the frequency of the power grid, and vice versa.
The process of increasing reactive power of the system when the grid voltage amplitude is reduced is verified in the PSCAD/EMTDC software, and the simulation result at the moment is shown in FIG. 6 (comprising FIG. 6(a) and FIG. 6 (b)). Fig. 6(a) shows that the grid voltage amplitude decreases by 12V when 2.5s, and at this time fig. 6(b) shows that the output reactive power of the grid-connected control system of the flywheel energy storage device increases by 2kvar, and the output reactive power is stable at a new balance point when about 3 s. From the above analysis, it can be known that the output reactive power of the energy storage system can be increased by the grid-connected control method provided by the embodiment after the grid voltage amplitude is reduced, so as to adjust the voltage of the grid, and vice versa.
The present invention is not limited to the above-described embodiments. In summary, compared with the prior art, the invention has the following advantages:
the flywheel side control unit provided by the invention adopts a PI control mode, after each PI control parameter is determined, on one hand, a voltage control module can enable a direct current side actual voltage to follow a direct current side voltage preset value to obtain a flywheel side q-axis current reference value, and on the other hand, a current control module can enable a flywheel side d-axis output current and a flywheel side q-axis output current to respectively follow the flywheel side d-axis current reference value and the flywheel side q-axis current reference value to obtain a flywheel side d-axis voltage reference value and a flywheel side q-axis voltage reference value.
The frequency-active control equation constructed by the power grid side control unit provided by the invention can quickly respond to the change of the power grid frequency, and can reduce or increase the active power of the energy storage system according to the increase or decrease of the power grid frequency, so that the mechanical inertia of the flywheel rotor is converted into the inertia of the power system through the integral control method and system, and the frequency regulation of the power grid is realized.
The voltage-reactive power control equation constructed by the power grid side control unit provided by the invention can quickly respond to the voltage change of the power grid, and the converter can reduce or increase reactive power according to the increase or decrease of the voltage amplitude of the power grid, so that the voltage regulation of the power grid is realized.
The power grid side control unit provided by the invention does not use a traditional double-loop control method, does not need to carry out rotation coordinate transformation, and is low in control complexity, simple in calculation and easy for engineering realization.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (7)

1.一种适用于飞轮储能装置的并网控制方法，其特征在于，包括：1. a grid-connected control method applicable to a flywheel energy storage device, is characterized in that, comprising: 飞轮侧dq输出电流解耦控制：将飞轮侧d轴输出电流与飞轮侧d轴电流参考值作差后进行PI控制，输出飞轮侧d轴电压参考值；并且将直流侧实际电压与直流侧电压设定值作差后进行PI控制，输出的飞轮侧q轴电流参考值与飞轮侧q轴输出电流作差后PI控制，输出飞轮侧q轴电压参考值；Decoupling control of dq output current on flywheel side: PI control is performed after the difference between the output current of d-axis on flywheel side and the reference value of d-axis current on flywheel side, and the reference value of d-axis voltage on flywheel side is output; PI control is performed after the set value is different, the output flywheel side q-axis current reference value is different from the flywheel side q-axis output current after PI control, and the flywheel side q-axis voltage reference value is output; 根据飞轮侧d轴、q轴电压参考值及飞轮侧电路的工作频率，得到飞轮侧三相电压参考值后，利用SVPWM信号发生器，获取飞轮侧变流器的PWM信号；According to the d-axis and q-axis voltage reference values of the flywheel side and the operating frequency of the flywheel side circuit, after obtaining the three-phase voltage reference value of the flywheel side, use the SVPWM signal generator to obtain the PWM signal of the flywheel side converter; 通过飞轮侧变流器的PWM信号驱动飞轮侧变流器更新直流侧实际电压；The flywheel side converter is driven by the PWM signal of the flywheel side converter to update the actual voltage of the DC side; 实时监测输出电压频率，根据频率-有功控制方程调节输出有功功率，并对输出电压频率积分获取相位数据θ；Monitor the output voltage frequency in real time, adjust the output active power according to the frequency-active power control equation, and obtain the phase data θ by integrating the output voltage frequency; 实时监测输出电压有效值，根据电压-无功控制方程调节输出无功功率，并采集电压-无功控制方程的输出量e；Monitor the effective value of the output voltage in real time, adjust the output reactive power according to the voltage-reactive power control equation, and collect the output e of the voltage-reactive power control equation; 将相位数据θ和电压-无功控制方程的输出量e相乘，相乘结果进行相位平移后获取对称的电网侧三相交流电压参考值esin(θ+120°)、esinθ、esin(θ-120°)；将esin(θ+120°)、esinθ、esin(θ-120°)输入SVPWM信号发生器，获取电网侧变流器的PWM信号；Multiply the phase data θ and the output value e of the voltage-reactive power control equation. After the multiplication result is phase shifted, the symmetrical grid-side three-phase AC voltage reference values esin(θ+120°), esinθ, esin(θ- 120°); input esin(θ+120°), esinθ, esin(θ-120°) into the SVPWM signal generator to obtain the PWM signal of the grid-side converter; 利用电网侧变流器的PWM信号驱动电网侧变流器将更新后的直流侧实际电压转换为电网侧的交流量，并将其进行LCL滤波后，输入交流电网。The grid-side converter is driven by the PWM signal of the grid-side converter to convert the updated actual voltage on the DC side into the AC quantity on the grid side, and after LCL filtering, it is input to the AC grid. 2.根据权利要求1所述的并网控制方法，其特征在于，所述飞轮侧d轴、q轴输出电流的获取方法为：2. The grid-connected control method according to claim 1, wherein the method for obtaining the output current of the flywheel side d-axis and q-axis is: 飞轮侧输出电压经锁相环，获取飞轮侧电路的工作频率ωf；The output voltage of the flywheel side is obtained through a phase-locked loop to obtain the operating frequency ω f of the flywheel side circuit; 根据飞轮侧电路的工作频率，采用派克变换公式，将飞轮侧输出电流分解为飞轮侧d轴、q轴输出电流。According to the operating frequency of the flywheel side circuit, the Parker transformation formula is used to decompose the flywheel side output current into the flywheel side d-axis and q-axis output currents. 3.根据权利要求1或2所述的并网控制方法，其特征在于，构建电网侧变流器的频率-有功控制方程和电压-无功控制方程的方法为：3. The grid-connected control method according to claim 1 or 2, wherein the method for constructing the frequency-active power control equation and the voltage-reactive power control equation of the grid-side converter is: 通过检测电网侧三相交流量中的电网电流和滤波后电压，计算电网侧控制单元的输出有功功率、输出无功功率、输出电压有效值和输出电压频率；Calculate the output active power, output reactive power, output voltage RMS and output voltage frequency of the control unit on the grid side by detecting the grid current and filtered voltage in the three-phase AC quantity on the grid side; 根据电网侧控制单元的输出有功功率、输出电压频率、有功功率设定值、额定电压频率、虚拟转动惯量和有功调整系数构建电网侧变流器的频率-有功控制方程；According to the output active power, output voltage frequency, active power setting value, rated voltage frequency, virtual moment of inertia and active power adjustment coefficient of the grid-side control unit, construct the frequency-active power control equation of the grid-side converter; 根据电网侧控制单元的输出无功功率、输出电压有效值，无功功率设定值、额定电压、虚拟调压系数和无功调整输出电压有效值系数构建电网侧变流器的电压-无功控制方程。According to the output reactive power of the grid-side control unit, the effective value of the output voltage, the reactive power setting value, the rated voltage, the virtual voltage regulation coefficient and the reactive power adjustment output voltage effective value coefficient, the voltage-reactive power of the grid-side converter is constructed. control equation. 4.根据权利要求1或2所述的并网控制方法，其特征在于，所述飞轮侧变流器的PWM信号的获取方法为：4. The grid-connected control method according to claim 1 or 2, wherein the method for obtaining the PWM signal of the flywheel-side converter is: 将飞轮侧d轴电压参考值与飞轮侧q轴电压参考值基于飞轮侧电路的工作频率的派克逆变换，得到飞轮侧三相交流电压参考值；The flywheel side d-axis voltage reference value and the flywheel side q-axis voltage reference value are based on the Parker inverse transformation of the operating frequency of the flywheel side circuit to obtain the flywheel side three-phase AC voltage reference value; 将飞轮侧三相交流电压参考值送入SVPWM信号发生器，得到飞轮侧变流器的PWM信号。The three-phase AC voltage reference value on the flywheel side is sent to the SVPWM signal generator to obtain the PWM signal of the flywheel side converter. 5.一种适用于飞轮储能装置的并网控制系统，其特征在于，包括：飞轮侧控制单元、电网侧控制单元和数据处理模块；5. A grid-connected control system suitable for a flywheel energy storage device, characterized in that it comprises: a flywheel side control unit, a grid side control unit and a data processing module; 所述飞轮侧控制单元包括电压控制模块、电流控制模块和SVPWM信号发生器；The flywheel side control unit includes a voltage control module, a current control module and an SVPWM signal generator; 所述电压控制模块和所述电流控制模块用于飞轮侧dq输出电流解耦控制：所述电压控制模块用于将直流侧实际电压与直流侧电压设定值作差后进行PI控制，输出飞轮侧q轴电流参考值；所述电流控制模块用于将飞轮侧d轴输出电流与飞轮侧d轴电流参考值作差后进行PI控制，输出飞轮侧d轴电压参考值；并将飞轮侧q轴电流参考值与飞轮侧q轴输出电流作差后进行PI控制，输出飞轮侧q轴电压参考值；The voltage control module and the current control module are used for the flywheel side dq output current decoupling control: the voltage control module is used to perform PI control after the difference between the actual voltage of the DC side and the set value of the DC side voltage, and output the flywheel. side q-axis current reference value; the current control module is used to perform PI control after the difference between the flywheel side d-axis output current and the flywheel side d-axis current reference value, and output the flywheel side d-axis voltage reference value; After the difference between the reference value of the shaft current and the output current of the q-axis on the flywheel side, PI control is performed, and the reference value of the q-axis voltage on the flywheel side is output; 所述SVPWM用于接收飞轮侧与电网侧的三相交流电压参考值，分别获取飞轮侧变流器的PWM信号与电网侧变流器的PWM信号；The SVPWM is used to receive the three-phase AC voltage reference value of the flywheel side and the grid side, and obtain the PWM signal of the flywheel side converter and the PWM signal of the grid side converter respectively; 所述电网侧控制单元包括有功控制模块和无功控制模块；所述有功控制模块用于接收输出电压频率，根据频率-有功控制方程调节输出有功功率，并对输出电压频率积分获取相位数据θ；所述无功控制模块用于接收输出电压有效值，根据电压-无功控制方程调节输出无功功率，并采集电压-无功控制方程的输出量e；所述数据处理模块用于根据飞轮侧d轴、q轴电压参考值及飞轮侧电路的工作频率，得到飞轮侧三相交流电压参考值；将相位数据θ和电压-无功控制方程的输出量e相乘，相乘结果进行相位平移后获取对称的电网侧三相交流电压参考值esin(θ+120°)、esinθ、esin(θ-120°)。The grid-side control unit includes an active power control module and a reactive power control module; the active power control module is configured to receive the output voltage frequency, adjust the output active power according to the frequency-active power control equation, and integrate the output voltage frequency to obtain phase data θ; The reactive power control module is used for receiving the effective value of the output voltage, adjusting the output reactive power according to the voltage-reactive power control equation, and collecting the output quantity e of the voltage-reactive power control equation; the data processing module is used for according to the flywheel side The reference value of the d-axis and q-axis voltages and the operating frequency of the flywheel side circuit are used to obtain the reference value of the three-phase AC voltage on the flywheel side; multiply the phase data θ and the output quantity e of the voltage-reactive power control equation, and the multiplication result is used for phase translation. Then obtain the symmetrical three-phase AC voltage reference values esin(θ+120°), esinθ, esin(θ-120°) on the grid side. 6.根据权利要求5所述的并网控制系统，其特征在于，所述数据处理模块还用于通过电网侧三相交流量中的电网电流和滤波后电压，计算电网侧控制单元的输出有功功率、输出无功功率、输出电压有效值和输出电压频率；6 . The grid-connected control system according to claim 5 , wherein the data processing module is further configured to calculate the output active power of the grid-side control unit through grid current and filtered voltage in the grid-side three-phase alternating current. 7 . , output reactive power, output voltage RMS and output voltage frequency; 根据电网侧控制单元的输出有功功率、输出电压频率、有功功率设定值、额定电压频率、虚拟转动惯量和有功调整系数构建电网侧变流器的频率-有功控制方程；According to the output active power, output voltage frequency, active power setting value, rated voltage frequency, virtual moment of inertia and active power adjustment coefficient of the grid-side control unit, construct the frequency-active power control equation of the grid-side converter; 根据电网侧控制单元的输出无功功率、输出电压有效值，无功功率设定值、额定电压、虚拟调压系数和无功调整输出电压有效值系数构建电网侧变流器的电压-无功控制方程。According to the output reactive power of the grid-side control unit, the effective value of the output voltage, the reactive power setting value, the rated voltage, the virtual voltage regulation coefficient and the reactive power adjustment output voltage effective value coefficient, the voltage-reactive power of the grid-side converter is constructed. control equation. 7.根据权利要求6所述的并网控制系统，其特征在于，所述频率-有功控制方程为：7. The grid-connected control system according to claim 6, wherein the frequency-active power control equation is:
Figure FDA0003202641560000031
Figure FDA0003202641560000031
 其中，Pe为输出有功功率；ω为输出电压频率；Pset为有功功率设定值；ωn为额定电压频率；Jv为虚拟转动惯量；Dp为有功调整系数；Among them, P e is the output active power; ω is the output voltage frequency; P set is the active power setting value; ω n is the rated voltage frequency; J v is the virtual moment of inertia; D p is the active power adjustment coefficient; 所述电压-无功控制方程为：The voltage-reactive power control equation is:
Figure FDA0003202641560000041
Figure FDA0003202641560000041
 其中，Qe为电网侧控制单元的输出无功功率；U为输出电压有效值；Qset为无功功率设定值；Un为额定电压；K为虚拟调压系数；Dq为无功调整系数；e为电压-无功控制方程的输出量。Among them, Q e is the output reactive power of the grid-side control unit; U is the effective value of the output voltage; Q set is the reactive power setting value; U n is the rated voltage; K is the virtual voltage regulation coefficient; D q is the reactive power Adjustment coefficient; e is the output of the voltage-reactive power control equation.
CN202010203447.4A 2020-03-20 2020-03-20 A grid-connected control method and system suitable for a flywheel energy storage device Active CN111342491B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010203447.4A CN111342491B (en) 2020-03-20 2020-03-20 A grid-connected control method and system suitable for a flywheel energy storage device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010203447.4A CN111342491B (en) 2020-03-20 2020-03-20 A grid-connected control method and system suitable for a flywheel energy storage device

Publications (2)

Publication Number Publication Date
CN111342491A CN111342491A (en) 2020-06-26
CN111342491B true CN111342491B (en) 2021-10-08

Family

ID=71187698

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010203447.4A Active CN111342491B (en) 2020-03-20 2020-03-20 A grid-connected control method and system suitable for a flywheel energy storage device

Country Status (1)

Country Link
CN (1) CN111342491B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112803453B (en) * 2021-03-29 2021-07-20 沈阳微控新能源技术有限公司 Flywheel energy storage system, control method of flywheel energy storage system and storage medium
CN113517708A (en) * 2021-07-05 2021-10-19 内蒙古工业大学 Method, device, storage medium and controller for controlling flywheel energy storage array system
CN114744655B (en) * 2022-04-01 2022-12-02 北京奇稳新能源科技有限公司 Control method and topology device of flywheel energy storage system
CN116054216B (en) * 2023-02-23 2024-06-11 华夏天信智能物联股份有限公司 Flywheel energy storage grid-connected system control method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103280836A (en) * 2013-05-23 2013-09-04 中国科学院电工研究所 Flywheel energy storage system grid-connected control method and energy storage system thereof
CN108183507A (en) * 2018-01-15 2018-06-19 东北电力大学 A kind of grid-connected active support and control structures of PMSG based on VSG
CN110797885A (en) * 2019-11-29 2020-02-14 国网江苏省电力有限公司常州供电分公司 Three-phase four-bridge virtual synchronous power decoupling control method based on virtual impedance

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103280836A (en) * 2013-05-23 2013-09-04 中国科学院电工研究所 Flywheel energy storage system grid-connected control method and energy storage system thereof
CN108183507A (en) * 2018-01-15 2018-06-19 东北电力大学 A kind of grid-connected active support and control structures of PMSG based on VSG
CN110797885A (en) * 2019-11-29 2020-02-14 国网江苏省电力有限公司常州供电分公司 Three-phase four-bridge virtual synchronous power decoupling control method based on virtual impedance

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
基于飞轮储能的光伏并网发电功率平抑控制研究;周丽红等;《华东电力》;20120930;第1528-1532页 *

Also Published As

Publication number Publication date
CN111342491A (en) 2020-06-26

Similar Documents

Publication Publication Date Title
CN111342491B (en) A grid-connected control method and system suitable for a flywheel energy storage device
CN106356884B (en) A photovoltaic grid-connected control method, device and system based on a virtual synchronous machine
CN112217235B (en) Control method of voltage source full-power wind turbine based on energy storage coordination control
CN107968591B (en) Virtual inertia power decoupling control method of grid-connected inverter based on predicted common point voltage
CN101534065B (en) Asymmetric direct power control method for grid-connected three-phase voltage source converter
CN101944840B (en) Control method for eliminating DC harmonic voltage for grid-side converter of double-fed wind power generator
CN108493984B (en) A virtual synchronous generator control method suitable for photovoltaic grid-connected systems
CN108233415A (en) Two-stage type photovoltaic DC-to-AC converter virtual synchronous generator control method
CN102074967A (en) Method for controlling energy storage type wind power station with synchronization property
CN114665471B (en) Black start and coordination recovery method for receiving-end power grid based on wind power storage combined system
CN106026196A (en) Multi-virtual synchronous generator parallel network control method based on inverter
CN102769423A (en) Permanent magnet synchronous machine wind power generation system and control method based on Z-source inverter
CN113964879B (en) A new energy grid-connected inverter self-synchronous voltage source control method
CN115764912A (en) Networking type SVG control method taking stability and active support into consideration
CN108321844A (en) The control method of permanent magnet direct-drive wind generator system under harmonic voltage
WO2024245127A1 (en) Grid-forming control method for wind power converter, and wind power converter system
CN112003319A (en) Double-current feedback control method applied to bidirectional grid-connected converter
CN115764989A (en) Virtual synchronous generator system based on network-building type current converter
CN108365620A (en) A kind of method and device that energy-storage system is emulated based on Equivalent Model
CN114865711A (en) Dual-mode switching control method and system for new energy grid-connected inverter
CN109687745B (en) A single-phase inverter control method
CN110071524B (en) Virtual synchronization control method for single-phase cascaded H-bridge photovoltaic inverters
CN203466578U (en) 10kW wind-solar complementary experiment system
CN102843085B (en) Double-feed fan excitation control device and control method thereof
Lin et al. The grid connected converter control of multi-terminal DC system for wind farms

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant