WO2020147193A1 - Dc-side inertia enhancement control method for island diesel-storage hybrid power supply system - Google Patents

Dc-side inertia enhancement control method for island diesel-storage hybrid power supply system Download PDF

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WO2020147193A1
WO2020147193A1 PCT/CN2019/079254 CN2019079254W WO2020147193A1 WO 2020147193 A1 WO2020147193 A1 WO 2020147193A1 CN 2019079254 W CN2019079254 W CN 2019079254W WO 2020147193 A1 WO2020147193 A1 WO 2020147193A1
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controller
proportional
energy storage
power supply
supply system
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PCT/CN2019/079254
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French (fr)
Chinese (zh)
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罗安
张浚坤
何志兴
陈燕东
陈峻岭
刘阳
管仁锋
曾庆光
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广东志成冠军集团有限公司
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • 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
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means

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  • the embodiment of the present invention relates to the field of power supply system control, and in particular to a DC side inertia enhancement control method of an island diesel-storage hybrid power supply system.
  • Today’s diesel-storage hybrid power supply system is suitable for island power supply. Due to the large power required by the island’s special load, its power supply method mostly uses multiple converters in parallel to increase capacity, but the difference in output characteristics between multiple converters can easily lead to system circulation At the same time, the island contains a large number of impulsive resistive loads and nonlinear loads with power electronic interfaces, which cause serious distortion and violent fluctuations in the output voltage of special power supplies, which seriously affects the stable operation of the power system.
  • the invention provides a DC side inertia enhancement control method of an island diesel-storage hybrid power supply system, which realizes the control of the working state of a bidirectional energy storage converter according to a sampling signal, suppresses large fluctuations in the DC side voltage of the system, and makes the power supply system operate stably.
  • the embodiment of the present invention provides a DC side inertia enhancement control method of the island diesel-storage hybrid power supply system, which is suitable for the control of the bidirectional energy storage converter of the island diesel-storage hybrid power supply system.
  • the island diesel-storage hybrid power supply system includes a diesel generator set , Pre-stage PWM rectifier circuit, two-way energy storage converter, energy storage battery, DC side energy storage capacitor C 0 , post-stage multi-level PWM inverter circuit, filter circuit, AC bus, AC load, DC load, sampling and conditioning module , The controller and the drive protection module; the two-way energy storage converter and the energy storage battery are connected in parallel to the two ends of the DC side energy storage capacitor C 0 ; Q1 and Q2 and filter inductor L constitute;
  • the controller is respectively connected to the input end of the drive protection module and the output end of the sampling and conditioning module; the drive protection module drives the full-control power switch tube in the bidirectional energy storage converter, and the control
  • the device includes an inertial controller, a proportional integral controller, a proportional controller and a PWM signal generator; the method includes:
  • the sampling and conditioning module samples the output side current i o , the output side voltage u dc , and the inductor current i L of the bidirectional energy storage converter respectively, and transmits the sampled data to the controller for processing through a parallel interface;
  • the inertial controller calculates the difference between the preset output-side current rating I set and the output-side current i o to generate a command current signal i o * ;
  • the inertia controller subtracts the preset output-side voltage rated value U set from the output-side voltage reference value u dc * to obtain a voltage deviation value ⁇ U set ;
  • the inertial controller calculates the difference between the value obtained by multiplying the voltage deviation value ⁇ U set and the voltage oscillation damping coefficient D b with the command current signal i o * to obtain the current deviation value ⁇ i o ;
  • the inertial controller subtracts the output side voltage reference value u dc * and the output side voltage u dc to obtain a difference value e v , and outputs the difference value e v to the proportional integral controller;
  • the proportional integral controller generates a current amplitude command I v * for voltage outer loop control according to the difference e v ;
  • the proportional controller generates a modulated wave signal u r according to the difference between the current amplitude command I v * and the inductor current i L , and outputs the modulated wave signal u r to the PWM signal generator ;
  • the PWM signal generator performs PWM modulation on the modulation wave signal u r to obtain control signals m 1 and m 2 , and outputs the control signals m 1 and m 2 to the drive protection module;
  • the drive protection module controls the full control power switch tubes Q1 and Q2 according to the control signals m 1 and m 2 .
  • ⁇ i o is the current deviation value
  • c v is the virtual capacitance value
  • u dc is the output side voltage
  • the value range of the voltage oscillation damping coefficient D b is 5 ⁇ D b ⁇ 100; the value range of the virtual capacitance value c v is U set /D b ⁇ c v ⁇ 10 U set /D b ; Wherein, U set is the rated value of the output side voltage.
  • k p is the proportional coefficient of the proportional integral controller
  • ki is the integral coefficient of the proportional integral controller
  • 0.01 ⁇ ki ⁇ 10 0.01 ⁇ ki ⁇ 10
  • 1 /s is the integrator.
  • k ip ranging 0.1 ⁇ k ip ⁇ 40, k ip is the proportional coefficient of said proportional controller.
  • a DC side inertia enhancement control method of an island diesel-storage hybrid power supply system is provided.
  • the sampling and conditioning module generates a sampling signal according to the output signal of the bidirectional energy storage converter, and transmits the output side current sampling signal to the
  • the virtual inertia controller achieves the purpose of suppressing large fluctuations in the DC side voltage through virtual inertia control; the difference between the DC side output voltage reference value of the virtual inertia controller and the output side voltage sampling signal is calculated and then transmitted to the proportional integral
  • the controller uses a proportional-integral controller to perform proportional-integral control without static error tracking the DC voltage command; the proportional-integral controller generates a current amplitude command according to the difference, and combines the current amplitude command with the inductor
  • the difference between the current sampling signals is output to the proportional controller, and the steady-state accuracy of the system is improved by the proportional controller; the proportional controller generates a modulation wave signal according to the current amplitude instruction; and output
  • FIG. 1 is a schematic flowchart of a DC side inertia enhancement control method of an island diesel-storage hybrid power supply system according to an embodiment of the invention
  • FIG. 2 is a control block diagram of the DC side inertia enhancement control method of the island diesel-storage hybrid power supply system according to an embodiment of the present invention
  • Fig. 3 is a structural block diagram of an island-based diesel-storage hybrid power supply system according to an embodiment of the present invention.
  • FIG. 1 is a schematic flowchart of a DC side inertia enhancement control method of an island diesel-storage hybrid power supply system according to an embodiment of the present invention.
  • the embodiment of the present invention provides a DC side inertia enhancement control method of the island diesel-storage hybrid power supply system, which is suitable for the control of the bidirectional energy storage converter of the island diesel-storage hybrid power supply system.
  • the island diesel-storage hybrid power supply system includes a diesel generator set , pre-PWM rectifying circuit, a bidirectional converter storage, storage battery, the DC-side storage capacitor C 0, the level multi-level PWM inverter circuit, the L a, L b, L c , C a, C b , C c composed of LC filter circuit, AC bus, AC load, DC load, sampling and conditioning module, controller, drive protection module; the two-way energy storage converter and energy storage battery are connected in parallel to the DC side energy storage capacitor C 0 Both ends; the two-way energy storage converter is composed of a large capacitor C, fully-controlled power switch tubes Q1 and Q2, and a filter inductor L; the controller is connected to the input end of the drive protection module and the output end of the sampling and conditioning module; The drive protection module drives the full-control power switch tube in the two-way energy storage converter, and the controller includes an inertial controller, a proportional integral controller, a proportional controller, and a PWM signal generator; the method includes:
  • the sampling and conditioning module samples the output side current i o , the output side voltage u dc , and the inductor current i L of the bidirectional energy storage converter respectively, and transmits the sampled data to the controller through a parallel interface. deal with;
  • the sampling and conditioning module is connected to the bidirectional energy storage converter in the power supply system through the sampling terminal to sample the output signal of the bidirectional energy storage converter.
  • the sampling and conditioning module includes an A/D converter.
  • the controller controls the A/D converter to start so that the A/D converter samples the bidirectional energy storage converter.
  • the converter converts the output signal sampled by the sampling module from an electrical signal into a digital signal to generate a sampling signal, and transmits the sampling signal to an inertial controller and a proportional integral controller connected to the sampling module.
  • the output signal of the bidirectional energy storage converter includes the output side current i o and the output side voltage u dc , and the bidirectional energy storage converter also includes an inductor, and the bidirectional energy storage converter is connected to the energy storage battery through the inductor.
  • the sampling module In addition to sampling the output signal of the bidirectional energy storage converter, the sampling module also samples the inductor current i L in the bidirectional energy storage converter.
  • the inertial controller calculates the difference between the preset output-side current rating I set and the output-side current i o , and generates a command current signal i o * ;
  • the inertia controller subtracts the preset output-side voltage rated value U set from the output-side voltage reference value u dc * to obtain a voltage deviation value ⁇ U set ; wherein the output-side voltage reference value u dc * is controlled by inertia
  • the device is calculated according to the current deviation value ⁇ i o , and the specific calculation steps are: divide the current deviation value ⁇ i o by the virtual capacitance value c v and the output side voltage u dc , and integrate the obtained value;
  • the inertial controller multiplies the voltage deviation value ⁇ U set and the voltage oscillation damping coefficient D b to obtain the difference from the command current signal i o * to obtain a current deviation value ⁇ i o ;
  • the preset output side current rating I set is set according to the actual power supply system requirements, and the inertial controller is based on the preset output side current rating I set and the output side current i o sampled by the sampling module.
  • the difference value determines the command current signal i o * .
  • the inertia controller determines the current deviation value ⁇ i o according to the preset output side voltage rating U set and the command current signal i o * .
  • the preset output-side voltage rating U set is set according to the actual power supply system requirements.
  • FIG. 2 it is a control block diagram of the DC side inertia enhancement control method of the island diesel-storage hybrid power supply system according to an embodiment of the present invention.
  • the inertia controller determines the initial voltage deviation value ⁇ U set according to the difference between the preset output side voltage rating U set and the current output side voltage reference value u dc * . Based on the command current signal and the initial voltage deviation value, the controller determines the specific calculation process of the initial current deviation value: the inertial controller takes the product value of the initial voltage deviation value and the voltage oscillation damping coefficient D b and the command current signal i o * subtracted, the difference obtained is the initial current deviation value, and the initial current deviation value is determined as the current deviation value ⁇ i o .
  • the value range of the voltage oscillation damping coefficient D b is 5 ⁇ D b ⁇ 100.
  • the inertial controller divides the current deviation value ⁇ i o by the virtual capacitance value c v and the output side voltage u dc , and integrates them to obtain the output side voltage reference value u dc * ; among them, the output side voltage reference value u dc in the inertial controller *
  • the specific calculation process is:
  • the value range of the virtual capacitance value c v is U set /D b ⁇ c v ⁇ 10 U set /D b , where U set is the preset output-side voltage rating.
  • the method further includes:
  • the inertial controller determines the voltage deviation value ⁇ U set according to the difference between the preset output-side voltage rated value U set and the current output-side voltage reference value u dc * .
  • the inertial controller subtracts the product value of the voltage deviation value ⁇ U set and the voltage oscillation damping coefficient D b from the command current signal i o * , and updates the current deviation value ⁇ i o according to the calculated difference, and according to the updated current deviation value ⁇ i o recalculate the output side voltage reference value u dc * .
  • the inertial controller divides the updated current deviation value ⁇ i o by the virtual capacitance value c v and the output side voltage u dc , and integrates them to obtain the new output side voltage reference value u dc * , and updates the output side voltage reference value to The new output side voltage reference value u dc * obtained by calculation, thereby completing the update of the output side voltage reference value.
  • the update of the output side voltage reference value by the inertia controller makes the DC side voltage have greater inertia, and the DC side voltage fluctuation response frequency becomes smaller, so that a momentary load fluctuation will not cause a large voltage fluctuation response on the DC side. If the load fluctuation time is very short, under the virtual inertia control of the inertial controller, the DC side voltage fluctuation of the system is suppressed.
  • the inertia controller subtracts the output side voltage reference value u dc * and the output side voltage u dc to obtain a difference value e v , and outputs the difference value e v to the proportional integral controller ;
  • the proportional integral controller generates a current amplitude command I v * for voltage outer loop control according to the difference e v ;
  • the proportional integral controller uses the deviation value e v to perform voltage tracking adjustment, so that the actual DC voltage tracks the given output side voltage reference value.
  • the proportional integral controller eliminates the static difference between the output side voltage u dc of the bidirectional energy storage converter and the output side voltage reference value u dc * in the actual power supply system by integrally adjusting the difference e v , thereby achieving proportional
  • the integral controller tracks the DC voltage without static error according to the sampled signal.
  • the proportional and integral of the difference e v are linearly combined to form a control variable, that is, a current amplitude command I v * is generated.
  • the proportional-integral controller limits the generated current amplitude command and outputs it to prevent when the proportional-integral controller fails When the control is stable, the output signal is too large to avoid over-modulation and prevent the integrator in the proportional integral controller from saturation.
  • the proportional integral controller outputs the limited current amplitude command I v * to the proportional controller, so that the proportional controller performs current adjustment according to the current amplitude command.
  • the proportional integral control transfer function expression of the proportional integral controller is:
  • k p is the proportional coefficient of the proportional integral controller
  • k i is the integral coefficient of the proportional integral controller
  • 0.01 ⁇ ki ⁇ 10, 1 /s is the integrator.
  • the proportional controller generates a modulated wave signal u r according to the difference between the current amplitude command I v * and the inductor current i L , and outputs the modulated wave signal u r to the PWM signal Builder;
  • the proportional controller generates a modulation wave signal according to the current amplitude command I v * sent by the proportional integral controller and the inductor current i L of the inductor in the bidirectional energy storage converter sampled by the sampling module.
  • the deviation between the received current amplitude command I v * and the inductor current signal i L in the sampling signal is first obtained, and the proportional controller adjusts the control output according to the deviation, thereby generating a modulation wave signal u r And output the modulated wave signal to the PWM signal generator to make the current change in the direction of reducing the deviation and improve the steady-state accuracy of the system.
  • the proportional control transfer function expression of the proportional controller is:
  • the value range of k ip is 0.1 ⁇ k ip ⁇ 40.
  • the deviation adjustment speed of the proportional controller depends on the proportional coefficient k ip . The larger the proportional coefficient, the faster the deviation decreases.
  • the PWM signal generator performs PWM modulation on the modulation wave signal u r to obtain control signals m 1 and m 2 , and outputs the control signals m 1 and m 2 to the drive protection module;
  • the drive protection module controls the full-control power switch tubes Q1 and Q2 according to the control signals m 1 and m 2 .
  • the PWM signal generator includes a PWM modulation module. After the PWM signal generator receives the modulated wave signal u r , the PWM signal generator performs PWM modulation on the modulated wave signal u r , and performs amplitude limiting modulation on the modulated wave signal.
  • the control signal is generated so that the voltage amplitude of the control signal is within the tolerable range of the switch tube electronic device in the converter, so as to avoid damage to the switch tube electronic device in the converter.
  • the converter in the power supply system includes two fully-controlled power switches, and the PWM signal generator performs PWM modulation on the received modulated wave signal u r to obtain two fully-controlled powers.
  • the control signals m 1 and m 2 of the switch tube, and the control signals m 1 and m 2 are output to the drive protection module to drive and control two of the two-way energy storage converters according to the control signals m 1 and m 2 through the drive protection module
  • the turn-on and turn-off of the fully-controlled power switch can control the working state of the bidirectional energy storage converter.
  • the sampling and conditioning module generates a sampling signal according to the output signal of the bidirectional energy storage converter, and outputs the The side current sampling signal is transmitted to the virtual inertial controller, and the purpose of suppressing large fluctuations in the DC voltage of the system is achieved through virtual inertial control; the output side voltage reference value of the virtual inertial controller is different from the output side voltage sampling signal
  • the proportional-integral control is performed by the proportional-integral controller, and there is no static difference to track the DC voltage command;
  • the proportional-integral controller generates a control command according to the difference, and compares the control command with the
  • the inductor current sampling signal is output to the proportional controller, and the steady-state accuracy of the system is improved through the proportional control of the proportional controller; the proportional controller generates a modulation wave signal according to the control instruction;
  • FIG. 3 it is a structural block diagram of an island-based diesel-storage hybrid power supply system according to an embodiment of the present invention.
  • the power supply system can be adapted to implement the DC side inertia enhancement control method of the island diesel-storage hybrid power supply system in the embodiment.
  • the island diesel-storage hybrid power supply system provided by the present invention includes:
  • Pre-stage PWM rectifier circuit 310 Pre-stage PWM rectifier circuit 310, post-stage multi-level PWM inverter circuit 320, filter circuit 330, rectifier module 340 and load module 350; among them,
  • the input terminal of the latter stage multilevel PWM inverter circuit 320 and the output terminal of the previous stage PWM rectifier circuit 310, the output terminal of the latter stage multilevel PWM inverter circuit 320 and the filter circuit 330 The input terminal is connected; the output terminal of the previous-stage PWM rectifier circuit 310 is also connected to the converter;
  • the input terminal of the rectifier module 340 is connected with the output terminal of the filter circuit 330, and the output terminal of the rectifier module 340 is connected with the load module 350.
  • the rectifier module 340 includes: a PWM inverter 341, a first rectifier 342, and a second rectifier 343, and the load module 350 includes a DC load 351 and an AC load 352;
  • the input terminal of the first rectifier 342 is connected with the output terminal of the filter circuit 330, and the output terminal of the first rectifier 342 is connected with the DC load 351;
  • the input terminal of the second rectifier 343 is connected to the output terminal of the filter circuit 330, and the output terminal of the second rectifier 343 is connected to the AC load 352 through the PWM inverter 341.
  • the input terminal of the first rectifier 342 is connected to the output terminal of the filter circuit 330 through a bus; the input terminal of the second rectifier 343 is connected to the output terminal of the filter circuit 330 through a bus.
  • the bidirectional energy storage converter includes an inductor and a fully-controlled power switch tube; one end of the inductor is connected to the output end of the fully-controlled power switch tube, and The other end of the inductor is connected with the energy storage battery, which includes a super capacitor and a storage battery.
  • the full control power switch tube includes a drive end; the drive end of the full control power switch tube is connected to the drive protection module and is used to receive the control signal output by the drive protection module.
  • a DC side energy storage capacitor C 0 is provided between the output terminal of the previous-stage PWM rectifier circuit 310 and the input terminal of the latter-stage multi-level PWM inverter circuit 320.
  • the input end of the front-stage PWM rectifier circuit 310 is connected to a generator set, which includes a diesel generator set.
  • the filter circuit 330 includes an LC filter circuit of L a, L b, L c , C a, C b, C c thereof; bidirectional converter by a large storage capacitor C, Full-controlled power switch tubes Q 1 and Q 2 , and filter inductor L are formed.
  • the front-stage PWM rectifier circuit 310 converts the alternating current generated by the generator set into direct current; energy flows in both directions on the converter, which can provide a path for charging and discharging the energy storage battery; the energy storage battery is used for saving Energy; the energy storage capacitor C 0 on the DC side is used for energy storage; the subsequent multi-level PWM inverter circuit 320 is used to convert alternating current into direct current; the filter circuit 330 is used to filter out higher harmonics in the circuit.
  • the embodiment of the present invention provides a DC side inertia enhancement control method for an island diesel-storage hybrid power supply system.
  • the sampling conditioning module generates a sampling signal according to the output signal of the converter, and transmits the output side current sampling signal To the virtual inertia controller, the purpose of suppressing large fluctuations in the DC side voltage is achieved through virtual inertia control; the difference between the output side voltage reference value of the virtual inertia controller and the output side voltage sampling signal is calculated and then transmitted to the proportional
  • the integral controller performs proportional integral control through the proportional integral controller, and tracks the DC voltage command without static difference; the proportional integral controller generates a current amplitude command according to the difference, and compares the current amplitude command with the The difference of the inductor current sampling signal is output to the proportional controller, and the steady-state accuracy of the system is improved through proportional control of the proportional controller; the proportional controller generates a modulation wave signal according to the current amplitude instruction; The wave signal is output to the P

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Abstract

Disclosed in the present invention is a DC-side inertia enhancement control method for an island diesel-storage hybrid power supply system, primarily comprising the two portions of virtual inertia control and voltage-current dual loop control. Virtual inertia control causes a DC side of an island diesel-storage hybrid power supply system to possess greater inertia, stabilizing voltage fluctuations in a DC bus. Proportional integral control is used in an outer voltage loop, allowing for tracking, without static error, of a voltage parameter value of an output side of a bidirectional energy storage converter, and proportional control is used in an inner current loop, improving steady-state precision in the system. By means of the present invention, control of the working state of a bidirectional energy storage converter on the basis of a sampling signal is made possible, suppressing large voltage fluctuations in a DC-side of a system, and causing the power supply system to operate smoothly.

Description

海岛柴储混合供电系统的直流侧惯性增强控制方法DC side inertia enhancement control method of island diesel-storage hybrid power supply system 技术领域Technical field
本发明实施例涉及供电系统控制领域，具体涉及一种海岛柴储混合供电系统的直流侧惯性增强控制方法。The embodiment of the present invention relates to the field of power supply system control, and in particular to a DC side inertia enhancement control method of an island diesel-storage hybrid power supply system.
背景技术Background technique
随着我国海洋供电系统规模不断扩大化，网络不断复杂化，国防与民用设备对系统的安全性和稳定性要求越来越高。在远海岛屿，受限于海洋地域条件及装备所处工作环境，网架性缺电和电源不可靠性问题依然并存，极大影响了海岛居民的正常生产生活，制约了海岛经济的发展。As the scale of my country's marine power supply system continues to expand and the network continues to become more complex, the security and stability requirements of national defense and civilian equipment are becoming higher and higher. In the offshore islands, limited by the geographical conditions of the ocean and the working environment of the equipment, the grid-based lack of power and the unreliability of the power supply still coexist, which greatly affects the normal production and life of island residents and restricts the development of the island’s economy.
现今适合海岛供电的柴储混合供电系统，由于海岛特种负荷所需功率大，其供电方式多采用多变流器并联实现增容，但多个变流器之间存在输出特性差异容易导致系统环流与并联谐振；同时，海岛含有大量的冲击性阻感负荷及具备电力电子接口的非线性负荷，导致特种电源输出电压严重畸变和剧烈波动，严重影响电源系统稳定运行。Today’s diesel-storage hybrid power supply system is suitable for island power supply. Due to the large power required by the island’s special load, its power supply method mostly uses multiple converters in parallel to increase capacity, but the difference in output characteristics between multiple converters can easily lead to system circulation At the same time, the island contains a large number of impulsive resistive loads and nonlinear loads with power electronic interfaces, which cause serious distortion and violent fluctuations in the output voltage of special power supplies, which seriously affects the stable operation of the power system.
发明内容Summary of the invention
本发明提供一种海岛柴储混合供电系统的直流侧惯性增强控制方法，实现根据采样信号控制双向储能变换器的工作状态，抑制系统直流侧电压大幅波动，使得供电系统稳定运行。The invention provides a DC side inertia enhancement control method of an island diesel-storage hybrid power supply system, which realizes the control of the working state of a bidirectional energy storage converter according to a sampling signal, suppresses large fluctuations in the DC side voltage of the system, and makes the power supply system operate stably.
本发明实施例提供了一种海岛柴储混合供电系统的直流侧惯性增强控制方 法，适用于海岛柴储混合供电系统的双向储能变换器控制，所述海岛柴储混合供电系统包括柴油发电机组、前级PWM整流电路、双向储能变换器、储能电池、直流侧储能电容C 0、后级多电平PWM逆变电路、滤波电路、交流母线、交流负载、直流负载、采样调理模块、控制器和驱动保护模块；所述双向储能变换器、储能电池并联连接在直流侧储能电容C 0两端；所述双向储能变换器由大电容C、全控型功率开关管Q1及Q2和滤波电感L构成； The embodiment of the present invention provides a DC side inertia enhancement control method of the island diesel-storage hybrid power supply system, which is suitable for the control of the bidirectional energy storage converter of the island diesel-storage hybrid power supply system. The island diesel-storage hybrid power supply system includes a diesel generator set , Pre-stage PWM rectifier circuit, two-way energy storage converter, energy storage battery, DC side energy storage capacitor C 0 , post-stage multi-level PWM inverter circuit, filter circuit, AC bus, AC load, DC load, sampling and conditioning module , The controller and the drive protection module; the two-way energy storage converter and the energy storage battery are connected in parallel to the two ends of the DC side energy storage capacitor C 0 ; Q1 and Q2 and filter inductor L constitute;
所述控制器分别与所述驱动保护模块的输入端和所述采样调理模块的输出端连接；所述驱动保护模块驱动所述双向储能变换器中的全控型功率开关管，所述控制器包括惯性控制器、比例积分控制器、比例控制器和PWM信号生成器；所述方法包括：The controller is respectively connected to the input end of the drive protection module and the output end of the sampling and conditioning module; the drive protection module drives the full-control power switch tube in the bidirectional energy storage converter, and the control The device includes an inertial controller, a proportional integral controller, a proportional controller and a PWM signal generator; the method includes:
所述采样调理模块对所述双向储能变换器的输出侧电流i o、输出侧电压u dc、电感电流i L分别进行采样，并将采样数据通过并行接口输送给所述控制器进行处理； The sampling and conditioning module samples the output side current i o , the output side voltage u dc , and the inductor current i L of the bidirectional energy storage converter respectively, and transmits the sampled data to the controller for processing through a parallel interface;
所述惯性控制器根据预设的输出侧电流额定值I set与所述输出侧电流i o进行求差，生成指令电流信号i o *； The inertial controller calculates the difference between the preset output-side current rating I set and the output-side current i o to generate a command current signal i o * ;
所述惯性控制器根据预设的输出侧电压额定值U set与输出侧电压参考值u dc *相减，得到电压偏差值ΔU set； The inertia controller subtracts the preset output-side voltage rated value U set from the output-side voltage reference value u dc * to obtain a voltage deviation value ΔU set ;
所述惯性控制器将所述电压偏差值ΔU set和电压振荡阻尼系数D b相乘所得值与所述指令电流信号i o *求差，得到电流偏差值Δi o； The inertial controller calculates the difference between the value obtained by multiplying the voltage deviation value ΔU set and the voltage oscillation damping coefficient D b with the command current signal i o * to obtain the current deviation value Δi o ;
所述惯性控制器将所述输出侧电压参考值u dc *与所述输出侧电压u dc相减得到差值e v，并将所述差值e v输出至所述比例积分控制器； The inertial controller subtracts the output side voltage reference value u dc * and the output side voltage u dc to obtain a difference value e v , and outputs the difference value e v to the proportional integral controller;
所述比例积分控制器根据所述差值e v，生成电压外环控制的电流幅值指令 I v *； The proportional integral controller generates a current amplitude command I v * for voltage outer loop control according to the difference e v ;
所述比例控制器根据所述电流幅值指令I v *与所述电感电流i L的差值，生成调制波信号u r，并将所述调制波信号u r输出至所述PWM信号生成器； The proportional controller generates a modulated wave signal u r according to the difference between the current amplitude command I v * and the inductor current i L , and outputs the modulated wave signal u r to the PWM signal generator ；
所述PWM信号生成器将所述调制波信号u r进行PWM调制得到控制信号m 1和m 2，并将所述控制信号m 1和m 2输出至所述驱动保护模块； The PWM signal generator performs PWM modulation on the modulation wave signal u r to obtain control signals m 1 and m 2 , and outputs the control signals m 1 and m 2 to the drive protection module;
所述驱动保护模块根据所述控制信号m 1和m 2控制所述全控型功率开关管Q1及Q2。 The drive protection module controls the full control power switch tubes Q1 and Q2 according to the control signals m 1 and m 2 .
进一步地，所述输出侧电压参考值u dc *的计算过程为：
Figure PCTCN2019079254-appb-000001
Further, the calculation process of the output side voltage reference value u dc * is:
Figure PCTCN2019079254-appb-000001
其中，Δi o为所述电流偏差值；c v为虚拟电容值；u dc为所述输出侧电压。 Where Δi o is the current deviation value; c v is the virtual capacitance value; u dc is the output side voltage.
进一步地，所述电压振荡阻尼系数D b的取值范围为5≤D b≤100；所述虚拟电容值c v为的取值范围为U set/D b≤c v≤10U set/D b；其中，U set为所述输出侧电压额定值。 Further, the value range of the voltage oscillation damping coefficient D b is 5≤D b ≤100; the value range of the virtual capacitance value c v is U set /D b ≤c v ≤10 U set /D b ; Wherein, U set is the rated value of the output side voltage.
进一步地，所述比例积分控制器的传递函数表达式为：Further, the transfer function expression of the proportional integral controller is:
G PI(s)＝k p+k i/s G PI (s)=k p +k i /s
其中，k p是所述比例积分控制器的比例系数，0.1≤k p≤20，ki是所述比例积分控制器的积分系数，0.01≤k i≤10，1/s为积分器。 Wherein, k p is the proportional coefficient of the proportional integral controller, 0.1≤k p ≤20, ki is the integral coefficient of the proportional integral controller, 0.01≤ki ≤10, and 1 /s is the integrator.
进一步地，所述比例控制器的传递函数表达式为：Further, the transfer function expression of the proportional controller is:
G P(s)＝k ip G P (s)=k ip
其中，k ip取值范围为0.1≤k ip≤40，k ip是所述比例控制器的比例系数。 Wherein, k ip ranging 0.1≤k ip ≤40, k ip is the proportional coefficient of said proportional controller.
本发明实施例提供的一种海岛柴储混合供电系统的直流侧惯性增强控制方法，采样调理模块依据双向储能变换器的输出信号产生采样信号，并将所述输出侧电流采样信号传输至所述虚拟惯性控制器，通过虚拟惯性控制实现抑制直 流侧电压大幅波动的目的；所述虚拟惯性控制器的直流侧输出电压参考值与所述输出侧电压采样信号求得差值后传输到比例积分控制器，通过比例积分控制器进行比例积分控制，无静差跟踪直流电压指令；所述比例积分控制器根据所述差值生成电流幅值指令，并将所述电流幅值指令与所述电感电流采样信号之差输出至所述比例控制器，通过比例控制器提高系统的稳态精度；所述比例控制器根据所述电流幅值指令生成调制波信号；并将所述调制波信号输出至所述PWM信号生成器；所述PWM信号生成器根据所述调制波信号生成控制信号；并将所述控制信号输出至所述驱动保护模块，以控制所述双向储能变换器的工作状态。实现根据采样信号控制双向储能变换器的工作状态，抑制系统直流侧电压大幅波动，使得供电系统稳定运行。According to an embodiment of the present invention, a DC side inertia enhancement control method of an island diesel-storage hybrid power supply system is provided. The sampling and conditioning module generates a sampling signal according to the output signal of the bidirectional energy storage converter, and transmits the output side current sampling signal to the The virtual inertia controller achieves the purpose of suppressing large fluctuations in the DC side voltage through virtual inertia control; the difference between the DC side output voltage reference value of the virtual inertia controller and the output side voltage sampling signal is calculated and then transmitted to the proportional integral The controller uses a proportional-integral controller to perform proportional-integral control without static error tracking the DC voltage command; the proportional-integral controller generates a current amplitude command according to the difference, and combines the current amplitude command with the inductor The difference between the current sampling signals is output to the proportional controller, and the steady-state accuracy of the system is improved by the proportional controller; the proportional controller generates a modulation wave signal according to the current amplitude instruction; and outputs the modulation wave signal to The PWM signal generator; the PWM signal generator generates a control signal according to the modulation wave signal; and outputs the control signal to the drive protection module to control the working state of the bidirectional energy storage converter. Realize the control of the working state of the bidirectional energy storage converter according to the sampling signal, suppress the large fluctuation of the DC side voltage of the system, and make the power supply system operate stably.
附图说明BRIEF DESCRIPTION
图1为本发明实施例的海岛柴储混合供电系统的直流侧惯性增强控制方法的流程示意图；FIG. 1 is a schematic flowchart of a DC side inertia enhancement control method of an island diesel-storage hybrid power supply system according to an embodiment of the invention;
图2是本发明实施例的海岛柴储混合供电系统的直流侧惯性增强控制方法的控制框图；2 is a control block diagram of the DC side inertia enhancement control method of the island diesel-storage hybrid power supply system according to an embodiment of the present invention;
图3是本发明实施例的一种海岛柴储混合供电系统的结构框图。Fig. 3 is a structural block diagram of an island-based diesel-storage hybrid power supply system according to an embodiment of the present invention.
具体实施方式detailed description
图1为本发明实施例的海岛柴储混合供电系统的直流侧惯性增强控制方法的流程示意图。本发明实施例提供了一种海岛柴储混合供电系统的直流侧惯性增强控制方法，适用于海岛柴储混合供电系统的双向储能变换器控制，所述海 岛柴储混合供电系统包括柴油发电机组、前级PWM整流电路、双向储能变换器、储能电池、直流侧储能电容C 0、后级多电平PWM逆变电路、由L a、L b、L c、C a、C b、C c组成的LC滤波电路、交流母线、交流负载、直流负载、采样调理模块、控制器、驱动保护模块；所述双向储能变换器、储能电池并联连接在直流侧储能电容C 0两端；所述双向储能变换器由大电容C、全控型功率开关管Q1及Q2、滤波电感L构成；所述控制器与所述驱动保护模块输入端、采样调理模块输出端连接；所述驱动保护模块驱动所述双向储能变换器中的全控型功率开关管，所述控制器包括惯性控制器、比例积分控制器、比例控制器和PWM信号生成器；所述方法包括： FIG. 1 is a schematic flowchart of a DC side inertia enhancement control method of an island diesel-storage hybrid power supply system according to an embodiment of the present invention. The embodiment of the present invention provides a DC side inertia enhancement control method of the island diesel-storage hybrid power supply system, which is suitable for the control of the bidirectional energy storage converter of the island diesel-storage hybrid power supply system. The island diesel-storage hybrid power supply system includes a diesel generator set , pre-PWM rectifying circuit, a bidirectional converter storage, storage battery, the DC-side storage capacitor C 0, the level multi-level PWM inverter circuit, the L a, L b, L c , C a, C b , C c composed of LC filter circuit, AC bus, AC load, DC load, sampling and conditioning module, controller, drive protection module; the two-way energy storage converter and energy storage battery are connected in parallel to the DC side energy storage capacitor C 0 Both ends; the two-way energy storage converter is composed of a large capacitor C, fully-controlled power switch tubes Q1 and Q2, and a filter inductor L; the controller is connected to the input end of the drive protection module and the output end of the sampling and conditioning module; The drive protection module drives the full-control power switch tube in the two-way energy storage converter, and the controller includes an inertial controller, a proportional integral controller, a proportional controller, and a PWM signal generator; the method includes:
S110、所述采样调理模块对所述双向储能变换器的输出侧电流i o、输出侧电压u dc、电感电流i L分别进行采样，并将采样数据通过并行接口输送给所述控制器进行处理； S110. The sampling and conditioning module samples the output side current i o , the output side voltage u dc , and the inductor current i L of the bidirectional energy storage converter respectively, and transmits the sampled data to the controller through a parallel interface. deal with;
需要说明的是，采样调理模块通过采样端与供电系统中的双向储能变换器连接，采样双向储能变换器的输出信号。具体地，采样调理模块包括A/D转换器，在每个采样周期的起始点，控制器控制A/D转换器启动，使得A/D转换器对双向储能变换器进行采样，A/D转换器将采样模块采样到的输出信号由电信号转换为数字信号从而生成采样信号，并将采样信号传输给与采样模块连接的惯性控制器和比例积分控制器。It should be noted that the sampling and conditioning module is connected to the bidirectional energy storage converter in the power supply system through the sampling terminal to sample the output signal of the bidirectional energy storage converter. Specifically, the sampling and conditioning module includes an A/D converter. At the beginning of each sampling period, the controller controls the A/D converter to start so that the A/D converter samples the bidirectional energy storage converter. The converter converts the output signal sampled by the sampling module from an electrical signal into a digital signal to generate a sampling signal, and transmits the sampling signal to an inertial controller and a proportional integral controller connected to the sampling module.
双向储能变换器的输出信号包括输出侧电流i o和输出侧电压u dc，并且双向储能变换器中还包括电感，双向储能变换器通过此电感与储能电池连接。采样模块除了采样双向储能变换器的输出信号还采样双向储能变换器中的电感电流i L。 The output signal of the bidirectional energy storage converter includes the output side current i o and the output side voltage u dc , and the bidirectional energy storage converter also includes an inductor, and the bidirectional energy storage converter is connected to the energy storage battery through the inductor. In addition to sampling the output signal of the bidirectional energy storage converter, the sampling module also samples the inductor current i L in the bidirectional energy storage converter.
S120、所述惯性控制器根据预设的输出侧电流额定值I set与所述输出侧电流i o进行求差，生成指令电流信号i o *； S120. The inertial controller calculates the difference between the preset output-side current rating I set and the output-side current i o , and generates a command current signal i o * ;
S130、所述惯性控制器根据预设的输出侧电压额定值U set与输出侧电压参考值u dc *相减，得到电压偏差值ΔU set；其中，输出侧电压参考值u dc *由惯性控制器根据电流偏差值Δi o计算获得，具体计算步骤为：将电流偏差值Δi o除以虚拟电容值c v和输出侧电压u dc，并对所得值进行积分； S130. The inertia controller subtracts the preset output-side voltage rated value U set from the output-side voltage reference value u dc * to obtain a voltage deviation value ΔU set ; wherein the output-side voltage reference value u dc * is controlled by inertia The device is calculated according to the current deviation value Δi o , and the specific calculation steps are: divide the current deviation value Δi o by the virtual capacitance value c v and the output side voltage u dc , and integrate the obtained value;
S140、所述惯性控制器将所述电压偏差值ΔU set和电压振荡阻尼系数D b相乘所得值与所述指令电流信号i o *求差，得到电流偏差值Δi o； S140. The inertial controller multiplies the voltage deviation value ΔU set and the voltage oscillation damping coefficient D b to obtain the difference from the command current signal i o * to obtain a current deviation value Δi o ;
具体地，预设的输出侧电流额定值I set根据实际的供电系统的需求而设定，惯性控制器根据预设的输出侧电流额定值I set与采样模块采样得到的输出侧电流i o的差值，确定指令电流信号i o *。 Specifically, the preset output side current rating I set is set according to the actual power supply system requirements, and the inertial controller is based on the preset output side current rating I set and the output side current i o sampled by the sampling module. The difference value determines the command current signal i o * .
惯性控制器根据预设的输出侧电压额定值U set和指令电流信号i o *确定电流偏差值Δi o。预设的输出侧电压额定值U set根据实际的供电系统的需求而设定。 The inertia controller determines the current deviation value Δi o according to the preset output side voltage rating U set and the command current signal i o * . The preset output-side voltage rating U set is set according to the actual power supply system requirements.
如图2所示，是本发明实施例的海岛柴储混合供电系统的直流侧惯性增强控制方法的控制框图。As shown in FIG. 2, it is a control block diagram of the DC side inertia enhancement control method of the island diesel-storage hybrid power supply system according to an embodiment of the present invention.
进一步地，当供电系统处于初始运行状态时，惯性控制器根据预设的输出侧电压额定值U set和当前的输出侧电压参考值u dc *的差值确定初始的电压偏差值ΔU set，惯性控制器基于所述指令电流信号和初始的电压偏差值，确定初始电流偏差值的具体计算过程为：惯性控制器将初始的电压偏差值与电压振荡阻尼系数D b的乘积值与指令电流信号i o *相减，得到的差值即为初始电流偏差值，并将所述初始电流偏差值确定为所述电流偏差值Δi o。其中，电压振荡阻尼系数D b的取值范围为5≤D b≤100。 Further, when the power supply system is in the initial operating state, the inertia controller determines the initial voltage deviation value ΔU set according to the difference between the preset output side voltage rating U set and the current output side voltage reference value u dc * . Based on the command current signal and the initial voltage deviation value, the controller determines the specific calculation process of the initial current deviation value: the inertial controller takes the product value of the initial voltage deviation value and the voltage oscillation damping coefficient D b and the command current signal i o * subtracted, the difference obtained is the initial current deviation value, and the initial current deviation value is determined as the current deviation value Δi o . Among them, the value range of the voltage oscillation damping coefficient D b is 5≤D b ≤100.
惯性控制器将电流偏差值Δi o除以虚拟电容值c v和输出侧电压u dc，并进行积分得到输出侧电压参考值u dc *；其中，在惯性控制器内输出侧电压参考值u dc *的具体计算过程为：
Figure PCTCN2019079254-appb-000002
虚拟电容值c v为的取值范围为U set/D b≤c v≤10U set/D b；其中，U set为预设的输出侧电压额定值。 The inertial controller divides the current deviation value Δi o by the virtual capacitance value c v and the output side voltage u dc , and integrates them to obtain the output side voltage reference value u dc * ; among them, the output side voltage reference value u dc in the inertial controller * The specific calculation process is:
Figure PCTCN2019079254-appb-000002
The value range of the virtual capacitance value c v is U set /D b ≤c v ≤10 U set /D b , where U set is the preset output-side voltage rating.
进一步地，惯性控制器根据电流偏差值生成所述输出侧电压参考值之后，还包括：Further, after the inertia controller generates the output side voltage reference value according to the current deviation value, the method further includes:
惯性控制器根据预设的输出侧电压额定值U set和当前的输出侧电压参考值u dc *的差值确定电压偏差值ΔU set。惯性控制器将电压偏差值ΔU set与电压振荡阻尼系数D b的乘积值与指令电流信号i o *相减，根据计算得到的差值更新电流偏差值Δi o，并根据更新后的电流偏差值Δi o重新计算输出侧电压参考值u dc *。惯性控制器将更新后的电流偏差值Δi o除以虚拟电容值c v和输出侧电压u dc，并进行积分得到新的输出侧电压参考值u dc *，并将输出侧电压参考值更新为计算获得的新的输出侧电压参考值u dc *，从而完成对输出侧电压参考值的更新。通过惯性控制器对输出侧电压参考值的更新使得直流侧电压具有较大的惯性，直流侧电压波动响应频率变小，不会因为一瞬间的负荷波动，造成直流侧产生一个电压大波动响应，若负荷波动时间很短，则在惯性控制器的虚拟惯性控制下抑制系统直流侧电压的波动。 The inertial controller determines the voltage deviation value ΔU set according to the difference between the preset output-side voltage rated value U set and the current output-side voltage reference value u dc * . The inertial controller subtracts the product value of the voltage deviation value ΔU set and the voltage oscillation damping coefficient D b from the command current signal i o * , and updates the current deviation value Δi o according to the calculated difference, and according to the updated current deviation value Δi o recalculate the output side voltage reference value u dc * . The inertial controller divides the updated current deviation value Δi o by the virtual capacitance value c v and the output side voltage u dc , and integrates them to obtain the new output side voltage reference value u dc * , and updates the output side voltage reference value to The new output side voltage reference value u dc * obtained by calculation, thereby completing the update of the output side voltage reference value. The update of the output side voltage reference value by the inertia controller makes the DC side voltage have greater inertia, and the DC side voltage fluctuation response frequency becomes smaller, so that a momentary load fluctuation will not cause a large voltage fluctuation response on the DC side. If the load fluctuation time is very short, under the virtual inertia control of the inertial controller, the DC side voltage fluctuation of the system is suppressed.
S150、所述惯性控制器将所述输出侧电压参考值u dc *与所述输出侧电压u dc相减得到差值e v，并将所述差值e v输出至所述比例积分控制器； S150. The inertia controller subtracts the output side voltage reference value u dc * and the output side voltage u dc to obtain a difference value e v , and outputs the difference value e v to the proportional integral controller ；
S160、所述比例积分控制器根据所述差值e v，生成电压外环控制的电流幅值指令I v *； S160. The proportional integral controller generates a current amplitude command I v * for voltage outer loop control according to the difference e v ;
比例积分控制器通过该偏差值e v来进行电压跟踪调节，使得实际直流电压 跟踪上给定的输出侧电压参考值。 The proportional integral controller uses the deviation value e v to perform voltage tracking adjustment, so that the actual DC voltage tracks the given output side voltage reference value.
具体地，比例积分控制器通过对该差值e v进行积分调节消除实际供电系统中双向储能变换器输出侧电压u dc与输出侧电压参考值u dc *之间的静差，从而实现比例积分控制器根据采样信号对直流电压进行无静差追踪。并将该差值e v的比例和积分通过线性组合构成控制量即生成电流幅值指令I v *，比例积分控制器将生成的电流幅值指令限幅后输出，防止当比例积分控制器未能稳定控制时输出信号过大，避免引发过调制，并防止比例积分控制器中的积分器饱和。比例积分控制器将限幅后的电流幅值指令I v *输出至比例控制器，以使比例控制器根据该电流幅值指令进行电流调节。 Specifically, the proportional integral controller eliminates the static difference between the output side voltage u dc of the bidirectional energy storage converter and the output side voltage reference value u dc * in the actual power supply system by integrally adjusting the difference e v , thereby achieving proportional The integral controller tracks the DC voltage without static error according to the sampled signal. The proportional and integral of the difference e v are linearly combined to form a control variable, that is, a current amplitude command I v * is generated. The proportional-integral controller limits the generated current amplitude command and outputs it to prevent when the proportional-integral controller fails When the control is stable, the output signal is too large to avoid over-modulation and prevent the integrator in the proportional integral controller from saturation. The proportional integral controller outputs the limited current amplitude command I v * to the proportional controller, so that the proportional controller performs current adjustment according to the current amplitude command.
在本发明实施例的一种实施示例中，比例积分控制器的比例积分控制传递函数表达式为：In an implementation example of the embodiment of the present invention, the proportional integral control transfer function expression of the proportional integral controller is:
G PI(s)＝k p+k i/s G PI (s)=k p +k i /s
其中，k p是比例积分控制器的比例系数，0.1≤k p≤20，k i是比例积分控制器的积分系数，0.01≤k i≤10，1/s为积分器。 Among them, k p is the proportional coefficient of the proportional integral controller, 0.1≤k p ≤20, k i is the integral coefficient of the proportional integral controller, 0.01≤ki ≤10, 1 /s is the integrator.
S170、所述比例控制器根据所述电流幅值指令I v *与所述电感电流i L的差值，生成调制波信号u r，并将所述调制波信号u r输出至所述PWM信号生成器； S170. The proportional controller generates a modulated wave signal u r according to the difference between the current amplitude command I v * and the inductor current i L , and outputs the modulated wave signal u r to the PWM signal Builder;
具体地，比例控制器根据比例积分控制器发送的电流幅值指令I v *和采样模块采样得到的双向储能变换器内电感的电感电流i L生成调制波信号。在比例控制器控制过程中，首先获得接收到的电流幅值指令I v *与采样信号中的电感电流信号i L的偏差，比例控制器根据该偏差调节控制输出，从而生成调制波信号u r并将该调制波信号输出给PWM信号生成器，使电流向着减小偏差的方向变化，提高系统的稳态精度。 Specifically, the proportional controller generates a modulation wave signal according to the current amplitude command I v * sent by the proportional integral controller and the inductor current i L of the inductor in the bidirectional energy storage converter sampled by the sampling module. In the control process of the proportional controller, the deviation between the received current amplitude command I v * and the inductor current signal i L in the sampling signal is first obtained, and the proportional controller adjusts the control output according to the deviation, thereby generating a modulation wave signal u r And output the modulated wave signal to the PWM signal generator to make the current change in the direction of reducing the deviation and improve the steady-state accuracy of the system.
在本发明实施例的一种实施示例中，比例控制器的比例控制传递函数表达式为：In an implementation example of the embodiment of the present invention, the proportional control transfer function expression of the proportional controller is:
G P(s)＝k ip G P (s)=k ip
其中，k ip取值范围为0.1≤k ip≤40，比例控制器的偏差调节速度取决于比例系数k ip，比例系数越大偏差减小的越快。 Among them, the value range of k ip is 0.1≤k ip ≤40. The deviation adjustment speed of the proportional controller depends on the proportional coefficient k ip . The larger the proportional coefficient, the faster the deviation decreases.
S180、所述PWM信号生成器将所述调制波信号u r进行PWM调制得到控制信号m 1和m 2，并将所述控制信号m 1和m 2输出至所述驱动保护模块； S180. The PWM signal generator performs PWM modulation on the modulation wave signal u r to obtain control signals m 1 and m 2 , and outputs the control signals m 1 and m 2 to the drive protection module;
S190、所述驱动保护模块根据所述控制信号m 1和m 2控制所述全控型功率开关管Q1及Q2。 S190. The drive protection module controls the full-control power switch tubes Q1 and Q2 according to the control signals m 1 and m 2 .
具体地，PWM信号生成器包括PWM调制模块，当PWM信号生成器接收到调制波信号u r后，PWM信号生成器对该调制波信号u r进行PWM调制，将调制波信号进行限幅调制后生成控制信号，以使该控制信号的电压幅值处于变换器内开关管电子器件的可承受范围内，避免变换器内开关管电子器件的损坏。在本发明实施例的一个实施示例中，供电系统中的变换器包括两个全控型功率开关管，PWM信号生成器对接收到调制波信号u r进行PWM调制后得到两个全控型功率开关管的控制信号m 1和m 2，并将控制信号m 1和m 2输出至驱动保护模块，以通过驱动保护模块根据控制信号m 1和m 2驱动和控制双向储能变换器内两个全控型功率开关管的开通和关断实现控制双向储能变换器的工作状态。 Specifically, the PWM signal generator includes a PWM modulation module. After the PWM signal generator receives the modulated wave signal u r , the PWM signal generator performs PWM modulation on the modulated wave signal u r , and performs amplitude limiting modulation on the modulated wave signal. The control signal is generated so that the voltage amplitude of the control signal is within the tolerable range of the switch tube electronic device in the converter, so as to avoid damage to the switch tube electronic device in the converter. In an implementation example of the embodiment of the present invention, the converter in the power supply system includes two fully-controlled power switches, and the PWM signal generator performs PWM modulation on the received modulated wave signal u r to obtain two fully-controlled powers. The control signals m 1 and m 2 of the switch tube, and the control signals m 1 and m 2 are output to the drive protection module to drive and control two of the two-way energy storage converters according to the control signals m 1 and m 2 through the drive protection module The turn-on and turn-off of the fully-controlled power switch can control the working state of the bidirectional energy storage converter.
需要说明的是，本发明实施例提供的一种海岛柴储混合供电系统的直流侧惯性增强控制方法，所述采样调理模块依据双向储能变换器的输出信号产生采样信号，并将所述输出侧电流采样信号传输至所述虚拟惯性控制器，通过虚拟惯性控制实现抑制系统直流电压大幅波动的目的；所述虚拟惯性控制器的输出 侧电压参考值与所述输出侧电压采样信号求得差值后传输到比例积分控制器，通过比例积分控制器进行比例积分控制，无静差跟踪直流电压指令；所述比例积分控制器根据所述差值生成控制指令，并将所述控制指令与所述电感电流采样信号输出至所述比例控制器，通过比例控制器比例控制提高系统的稳态精度；所述比例控制器根据所述控制指令生成调制波信号；并将所述调制波信号输出至所述PWM信号生成器；所述PWM信号生成器根据所述调制波信号向所述驱动保护模块输出控制信号，以控制所述变换器的工作状态。实现根据采样信号控制双向储能变换器的工作状态，抑制系统直流侧电压大幅波动，使得供电系统稳定运行。It should be noted that, according to an embodiment of the present invention provides a DC side inertia enhancement control method for an island diesel-storage hybrid power supply system, the sampling and conditioning module generates a sampling signal according to the output signal of the bidirectional energy storage converter, and outputs the The side current sampling signal is transmitted to the virtual inertial controller, and the purpose of suppressing large fluctuations in the DC voltage of the system is achieved through virtual inertial control; the output side voltage reference value of the virtual inertial controller is different from the output side voltage sampling signal After the value is transmitted to the proportional-integral controller, the proportional-integral control is performed by the proportional-integral controller, and there is no static difference to track the DC voltage command; the proportional-integral controller generates a control command according to the difference, and compares the control command with the The inductor current sampling signal is output to the proportional controller, and the steady-state accuracy of the system is improved through the proportional control of the proportional controller; the proportional controller generates a modulation wave signal according to the control instruction; and outputs the modulation wave signal to The PWM signal generator; the PWM signal generator outputs a control signal to the drive protection module according to the modulated wave signal to control the working state of the converter. Realize the control of the working state of the bidirectional energy storage converter according to the sampling signal, suppress the large fluctuation of the DC side voltage of the system, and make the power supply system operate stably.
如图3所示，是本发明实施例的一种海岛柴储混合供电系统的结构框图。该供电系统可适用于执行实施例中一种海岛柴储混合供电系统的直流侧惯性增强控制方法，本发明提供的一种海岛柴储混合供电系统包括：As shown in FIG. 3, it is a structural block diagram of an island-based diesel-storage hybrid power supply system according to an embodiment of the present invention. The power supply system can be adapted to implement the DC side inertia enhancement control method of the island diesel-storage hybrid power supply system in the embodiment. The island diesel-storage hybrid power supply system provided by the present invention includes:
前级PWM整流电路310、后级多电平PWM逆变电路320、滤波电路330、整流器模块340和负载模块350；其中，Pre-stage PWM rectifier circuit 310, post-stage multi-level PWM inverter circuit 320, filter circuit 330, rectifier module 340 and load module 350; among them,
所述后级多电平PWM逆变电路320的输入端与所述前级PWM整流电路310的输出端，所述后级多电平PWM逆变电路320的输出端与所述滤波电路330的输入端连接；所述前级PWM整流电路310的输出端还与所述变换器连接；The input terminal of the latter stage multilevel PWM inverter circuit 320 and the output terminal of the previous stage PWM rectifier circuit 310, the output terminal of the latter stage multilevel PWM inverter circuit 320 and the filter circuit 330 The input terminal is connected; the output terminal of the previous-stage PWM rectifier circuit 310 is also connected to the converter;
所述整流器模块340的输入端与所述滤波电路330的输出端连接，且所述整流器模块340的输出端与所述负载模块350连接。The input terminal of the rectifier module 340 is connected with the output terminal of the filter circuit 330, and the output terminal of the rectifier module 340 is connected with the load module 350.
进一步地，所述整流器模块340包括：PWM逆变器341、第一整流器342和第二整流器343，所述负载模块350包括直流负载351和交流负载352；Further, the rectifier module 340 includes: a PWM inverter 341, a first rectifier 342, and a second rectifier 343, and the load module 350 includes a DC load 351 and an AC load 352;
所述第一整流器342的输入端与所述滤波电路330的输出端连接，且所述 第一整流器342的输出端与所述直流负载351连接；The input terminal of the first rectifier 342 is connected with the output terminal of the filter circuit 330, and the output terminal of the first rectifier 342 is connected with the DC load 351;
所述第二整流器343的输入端与所述滤波电路330的输出端连接，且所述第二整流器343的输出端通过所述PWM逆变器341与所述交流负载352连接。The input terminal of the second rectifier 343 is connected to the output terminal of the filter circuit 330, and the output terminal of the second rectifier 343 is connected to the AC load 352 through the PWM inverter 341.
需要说明的是，第一整流器342的输入端通过母线与滤波电路330的输出端连接；第二整流器343的输入端通过母线与所述滤波电路330的输出端连接。It should be noted that the input terminal of the first rectifier 342 is connected to the output terminal of the filter circuit 330 through a bus; the input terminal of the second rectifier 343 is connected to the output terminal of the filter circuit 330 through a bus.
具体地，在本发明实施例的一个实施示例中，双向储能变换器包括电感和全控型功率开关管；所述电感的一端与所述全控型功率开关管的输出端连接，所述电感的另一端与所述储能电池连接，储能电池包括超级电容和蓄电池。所述全控型功率开关管包括驱动端；所述全控型功率开关管的驱动端与所述驱动保护模块连接，用于接收所述驱动保护模块输出的控制信号。前级PWM整流电路310的输出端与所述后级多电平PWM逆变电路320的输入端之间设有直流侧储能电容C 0。前级PWM整流电路310的输入端与发电机组连接，该发电机组包括柴油发电机组。 Specifically, in an implementation example of the embodiment of the present invention, the bidirectional energy storage converter includes an inductor and a fully-controlled power switch tube; one end of the inductor is connected to the output end of the fully-controlled power switch tube, and The other end of the inductor is connected with the energy storage battery, which includes a super capacitor and a storage battery. The full control power switch tube includes a drive end; the drive end of the full control power switch tube is connected to the drive protection module and is used to receive the control signal output by the drive protection module. A DC side energy storage capacitor C 0 is provided between the output terminal of the previous-stage PWM rectifier circuit 310 and the input terminal of the latter-stage multi-level PWM inverter circuit 320. The input end of the front-stage PWM rectifier circuit 310 is connected to a generator set, which includes a diesel generator set.
需要说明的是，在本发明实施例中，滤波电路330包括由L a、L b、L c、C a、C b、C c组成的LC滤波电路；双向储能变换器由大电容C、全控型功率开关管Q 1及Q 2、滤波电感L构成。前级PWM整流电路310将发电机组发出的交流电转换为直流电；能量在变换器上双向流动，既能给储能电池充电提供通路，也能给储能电池放电提供通路；储能电池用于储蓄能量；直流侧的储能电容C 0用于储能；后级多电平PWM逆变电路320用于将交流电转换为直流电；滤波电路330用于滤除电路中的高次谐波。 Incidentally, in the embodiment of the present invention, the filter circuit 330 includes an LC filter circuit of L a, L b, L c , C a, C b, C c thereof; bidirectional converter by a large storage capacitor C, Full-controlled power switch tubes Q 1 and Q 2 , and filter inductor L are formed. The front-stage PWM rectifier circuit 310 converts the alternating current generated by the generator set into direct current; energy flows in both directions on the converter, which can provide a path for charging and discharging the energy storage battery; the energy storage battery is used for saving Energy; the energy storage capacitor C 0 on the DC side is used for energy storage; the subsequent multi-level PWM inverter circuit 320 is used to convert alternating current into direct current; the filter circuit 330 is used to filter out higher harmonics in the circuit.
综上所述，本发明实施例提供的一种海岛柴储混合供电系统的直流侧惯性增强控制方法，采样调理模块依据变换器的输出信号产生采样信号，并将所述 输出侧电流采样信号传输至所述虚拟惯性控制器，通过虚拟惯性控制实现抑制直流侧电压大幅波动的目的；所述虚拟惯性控制器的输出侧电压参考值与所述输出侧电压采样信号求得差值后传输到比例积分控制器，通过比例积分控制器进行比例积分控制，无静差跟踪直流电压指令；所述比例积分控制器根据所述差值生成电流幅值指令，并将所述电流幅值指令与所述电感电流采样信号的差值输出至所述比例控制器，通过比例控制器比例控制提高系统的稳态精度；所述比例控制器根据所述电流幅值指令生成调制波信号；并将所述调制波信号输出至所述PWM信号生成器；所述PWM信号生成器根据所述调制波信号向所述驱动保护模块输出控制信号，以控制所述变换器的工作状态。实现根据采样信号控制双向储能变换器的工作状态，抑制系统直流侧电压大幅波动，使得供电系统稳定运行。In summary, the embodiment of the present invention provides a DC side inertia enhancement control method for an island diesel-storage hybrid power supply system. The sampling conditioning module generates a sampling signal according to the output signal of the converter, and transmits the output side current sampling signal To the virtual inertia controller, the purpose of suppressing large fluctuations in the DC side voltage is achieved through virtual inertia control; the difference between the output side voltage reference value of the virtual inertia controller and the output side voltage sampling signal is calculated and then transmitted to the proportional The integral controller performs proportional integral control through the proportional integral controller, and tracks the DC voltage command without static difference; the proportional integral controller generates a current amplitude command according to the difference, and compares the current amplitude command with the The difference of the inductor current sampling signal is output to the proportional controller, and the steady-state accuracy of the system is improved through proportional control of the proportional controller; the proportional controller generates a modulation wave signal according to the current amplitude instruction; The wave signal is output to the PWM signal generator; the PWM signal generator outputs a control signal to the drive protection module according to the modulated wave signal to control the working state of the converter. Realize the control of the working state of the bidirectional energy storage converter according to the sampling signal, suppress the large fluctuation of the DC side voltage of the system, and make the power supply system operate stably.

Claims (5)

  1. 一种海岛柴储混合供电系统的直流侧惯性增强控制方法，适用于海岛柴储混合供电系统的双向储能变换器控制，所述海岛柴储混合供电系统包括柴油发电机组、前级PWM整流电路、双向储能变换器、储能电池、直流侧储能电容C 0、后级多电平PWM逆变电路、滤波电路、交流母线、交流负载、直流负载、采样调理模块、控制器和驱动保护模块；所述双向储能变换器、储能电池并联连接在直流侧储能电容C 0两端；所述双向储能变换器由大电容C、全控型功率开关管Q1及Q2和滤波电感L构成，其特征在于，所述控制器分别与所述驱动保护模块的输入端和所述采样调理模块的输出端连接；所述驱动保护模块驱动所述双向储能变换器中的全控型功率开关管，所述控制器包括惯性控制器、比例积分控制器、比例控制器和PWM信号生成器；所述方法包括： A DC side inertia enhancement control method of an island diesel-storage hybrid power supply system is suitable for the control of a bidirectional energy storage converter of an island diesel-storage hybrid power supply system. The island diesel-storage hybrid power supply system includes a diesel generator set and a pre-stage PWM rectifier circuit , Bidirectional energy storage converter, energy storage battery, DC side energy storage capacitor C 0 , post-stage multi-level PWM inverter circuit, filter circuit, AC bus, AC load, DC load, sampling and conditioning module, controller and drive protection Module; the two-way energy storage converter and the energy storage battery are connected in parallel to the two ends of the DC side energy storage capacitor C 0 ; the two-way energy storage converter consists of a large capacitor C, a fully controlled power switch Q1 and Q2 and a filter inductor L configuration, characterized in that the controller is respectively connected with the input end of the drive protection module and the output end of the sampling and conditioning module; the drive protection module drives the full control type in the bidirectional energy storage converter A power switch tube, the controller includes an inertial controller, a proportional integral controller, a proportional controller and a PWM signal generator; the method includes:
    所述采样调理模块对所述双向储能变换器的输出侧电流i o、输出侧电压u dc、电感电流i L分别进行采样，并将采样数据通过并行接口输送给所述控制器进行处理； The sampling and conditioning module samples the output side current i o , the output side voltage u dc , and the inductor current i L of the bidirectional energy storage converter respectively, and transmits the sampled data to the controller for processing through a parallel interface;
    所述惯性控制器根据预设的输出侧电流额定值I set与所述输出侧电流i o进行求差，生成指令电流信号i o *； The inertial controller calculates the difference between the preset output-side current rating I set and the output-side current i o to generate a command current signal i o * ;
    所述惯性控制器根据预设的输出侧电压额定值U set与输出侧电压参考值u dc *相减，得到电压偏差值ΔU set； The inertia controller subtracts the preset output-side voltage rated value U set from the output-side voltage reference value u dc * to obtain a voltage deviation value ΔU set ;
    所述惯性控制器将所述电压偏差值ΔU set和电压振荡阻尼系数D b相乘所得值与所述指令电流信号i o *求差，得到电流偏差值Δi o； The inertial controller calculates the difference between the value obtained by multiplying the voltage deviation value ΔU set and the voltage oscillation damping coefficient D b with the command current signal i o * to obtain the current deviation value Δi o ;
    所述惯性控制器将所述输出侧电压参考值u dc *与所述输出侧电压u dc相减得到差值e v，并将所述差值e v输出至所述比例积分控制器； The inertial controller subtracts the output side voltage reference value u dc * and the output side voltage u dc to obtain a difference value e v , and outputs the difference value e v to the proportional integral controller;
    所述比例积分控制器根据所述差值e v，生成电压外环控制的电流幅值指令 I v *； The proportional integral controller generates a current amplitude command I v * for voltage outer loop control according to the difference e v ;
    所述比例控制器根据所述电流幅值指令I v *与所述电感电流i L的差值，生成调制波信号u r，并将所述调制波信号u r输出至所述PWM信号生成器； The proportional controller generates a modulated wave signal u r according to the difference between the current amplitude command I v * and the inductor current i L , and outputs the modulated wave signal u r to the PWM signal generator ；
    所述PWM信号生成器将所述调制波信号u r进行PWM调制得到控制信号m 1和m 2，并将所述控制信号m 1和m 2输出至所述驱动保护模块； The PWM signal generator performs PWM modulation on the modulation wave signal u r to obtain control signals m 1 and m 2 , and outputs the control signals m 1 and m 2 to the drive protection module;
    所述驱动保护模块根据所述控制信号m 1和m 2控制所述全控型功率开关管Q1及Q2。 The drive protection module controls the full control power switch tubes Q1 and Q2 according to the control signals m 1 and m 2 .
  2. 如权利要求1所述的海岛柴储混合供电系统的直流侧惯性增强控制方法，其特征在于，所述输出侧电压参考值u dc *的计算过程为：
    Figure PCTCN2019079254-appb-100001
    The DC side inertia enhancement control method of the island’s diesel-storage hybrid power supply system according to claim 1, wherein the calculation process of the output side voltage reference value u dc * is:
    Figure PCTCN2019079254-appb-100001
    其中，Δi o为所述电流偏差值；c v为虚拟电容值；u dc为所述输出侧电压。 Where Δi o is the current deviation value; c v is the virtual capacitance value; u dc is the output side voltage.
  3. 如权利要求2所述的海岛柴储混合供电系统的直流侧惯性增强控制方法，其特征在于，所述电压振荡阻尼系数D b的取值范围为5≤D b≤100；所述虚拟电容值c v为的取值范围为U set/D b≤c v≤10U set/D b；其中，U set为所述输出侧电压额定值。 The DC side inertia enhancement control method of the island diesel-storage hybrid power supply system according to claim 2, wherein the value range of the voltage oscillation damping coefficient D b is 5≤D b ≤100; the virtual capacitance value The value range of c v is U set /D b ≤c v ≤10 U set /D b , where U set is the rated value of the output side voltage.
  4. 如权利要求1所述的海岛柴储混合供电系统的直流侧惯性增强控制方法，其特征在于，所述比例积分控制器的传递函数表达式为：The DC side inertia enhancement control method of the island diesel-storage hybrid power supply system according to claim 1, wherein the transfer function expression of the proportional integral controller is:
    G PI(s)＝k p+k i/s G PI (s)=k p +k i /s
    其中，k p是所述比例积分控制器的比例系数，0.1≤k p≤20，k i是所述比例积分控制器的积分系数，0.01≤k i≤10，1/s为积分器。 Wherein, k p is the proportional coefficient of the proportional integral controller, 0.1≤k p ≤20, k i is the integral coefficient of the proportional integral controller, 0.01≤ki ≤10, 1 /s is the integrator.
  5. 如权利要求1所述的海岛柴储混合供电系统的直流侧惯性增强控制方法，其特征在于，所述比例控制器的传递函数表达式为：The DC side inertia enhancement control method of the island diesel-storage hybrid power supply system according to claim 1, wherein the transfer function expression of the proportional controller is:
    G P(s)＝k ip G P (s)=k ip
    其中，k ip取值范围为0.1≤k ip≤40，k ip是所述比例控制器的比例系数。 Wherein, k ip ranging 0.1≤k ip ≤40, k ip is the proportional coefficient of said proportional controller.
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