WO2019184389A1 - 一种用于多并网逆变器的无电压采样协调控制系统及方法 - Google Patents
一种用于多并网逆变器的无电压采样协调控制系统及方法 Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
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- H02J3/385—
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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
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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
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Definitions
- the invention relates to a voltage-free sampling coordinated control system and method for a multi-grid inverter.
- the grid-connected inverter is the key equipment for connecting photovoltaic panels and wind turbines to the grid.
- Large-scale renewable energy power generation systems represented by centralized photovoltaic power plants and wind farms require a large number of grid-connected inverters.
- the grid-connected inverter needs to obtain accurate grid voltage amplitude, phase angle and frequency information when it is connected to the grid to ensure that the inverter provides reactive power when the grid inputs active power or grid voltage decreases under normal operating conditions of the grid. support.
- the traditional method uses the grid voltage sampling plus phase-locked loop method to obtain the grid voltage information. Therefore, the grid-connected inverter should be equipped with a voltage detecting device. Since the controller allows the input voltage amplitude to be low, in order to ensure accurate grid voltage detection, the grid voltage detecting device should include voltage transformers, operational amplifiers, etc., and the voltage detecting device increases the inverter cost.
- the prior art mostly installs a voltage collecting device in each grid-connected converter. Although each inverter can calculate voltage amplitude, phase angle and frequency information according to local voltage information, the voltage collecting device increases the system. The cost reduces the competitive advantage of the inverter.
- Existing patents and papers propose a variety of improved forms of grid voltage acquisition methods, mainly to improve the detection accuracy of grid voltage distortion, without escaping the dependence on voltage acquisition devices.
- Patent application No. "201410073512.0" patent “Distributed grid-connected inverter system global synchronous pulse width modulation system and method” discloses a distributed grid-connected inverter system global synchronous pulse width modulation system, which determines global pulse width modulation
- the basic structure of the system includes a main control unit (global synchronization unit) and a plurality of grid-connected inverters located in different geographical locations, each of which is connected to a distributed power source, and each grid-connected inverter
- the controllers are connected to the grid through a common grid connection point, and the master control unit communicates with all the grid-connected inverters, and the master control unit receives the information of each grid-connected inverter, and after determining the global synchronization policy, the global synchronization is included.
- the global synchronization signals of the strategy are respectively sent to the respective grid-connected inverters, and each grid-connected inverter adjusts the phase of the pulse width modulation wave by using the global synchronization signal, so as to meet the pulse width modulation waves of each grid-connected inverter.
- the phase difference of the harmonic cancellation cancels the harmonic current injected into the grid by each grid-connected inverter. This method can effectively reduce the harmonic content of the total current.
- the patent does not mention how to use the existing communication channel for coordinated control of voltage-free sensors.
- the present invention provides a voltage-free sampling coordinated control system and method for a multi-grid inverter, which is only one inverter when multiple inverters are operated in parallel
- the grid voltage collecting device is installed in the grid, and the collected grid voltage information is shared to other parallel-operated inverters by means of communication, so that the coordinated control of the voltage-free sensors is connected to the grid.
- a voltage-free sampling coordinated control system for a multi-grid inverter includes a plurality of grid-connected inverters and a grid voltage collecting device, and an input end of each of the grid-connected inverters is connected to a power generating unit The output of each of the grid-connected inverters is connected to the grid through a common grid-connecting point, and each of the grid-connected inverters is connected to a communication line, and the grid voltage collecting device is installed in one of them.
- the grid-connected inverter collects grid voltage information through the grid voltage collecting device, and shares it to other grid-connected inverters through the communication line, and other grid-connected inverters use the received shared grid voltage information and The locally collected voltage, current and power information enables grid-connected operation of the voltage-free sensor.
- a control method based on the above non-voltage sampling coordinated control system for a multi-grid inverter comprising:
- Step 1) After installing the grid-connected inverter of the grid voltage collecting device to collect the instantaneous value of the grid voltage, the phase-locked loop PLL algorithm is used to obtain accurate grid voltage phase information, and the grid voltage phase information is converted into the pulse signal Syn2;
- Step 2 The grid-connected inverter of the grid voltage collecting device is combined with the pulse signal Syn1 and the conventional PWM synchronizing pulse signal Syn1 to generate a mixed synchronizing signal MixSyn including the grid voltage phase information and the PWM synchronizing information, and the hybrid synchronization is performed.
- the signal MixSyn is passed to other grid-connected inverters;
- Step 3 The other grid-connected inverter predicts the actual grid voltage phase according to the collected grid-connected current value and the inverter parameters, and then uses the received mixed synchronization signal MixSyn and the input and output parameters of the inverter to predict the grid.
- the voltage phase is corrected to achieve grid-connected operation of the voltage-free sensor.
- the grid phase generating module of the inverter receives the phase signal generated by the phase locked loop PLL, and generates the synchronization signal Syn2 when the phase is zero, and the Syn2 changes from 1 to 1 when the phase is 360°. 0, from 0 to 1 after a machine cycle of a digital signal processor.
- the synchronizing signal Syn1 generated by the Syn2 and the conventional PWM synchronizing signal generating module is processed by the signal combining module to generate a mixed synchronizing signal MixSyn, wherein the rising edge of the Syn1 signal is the rising edge of the mixed synchronizing signal MixSyn signal.
- the falling edge of the Syn2 signal is the falling edge of the mixed sync signal MixSyn.
- the other grid-connected inverter predicts the actual grid voltage phase through the grid voltage prediction algorithm, and corrects the predicted grid voltage phase by the grid voltage correction algorithm.
- the grid voltage prediction algorithm predicts the actual grid voltage phase according to the two-phase sampling current information in the dq coordinate system of the grid-connected inverter and the known inverter output filtering parameters.
- the grid voltage correction algorithm corrects the grid voltage phase by the received mixed synchronizing signal MixSyn, the grid-connected inverter actual output current and the input power, and outputs the corrected grid voltage predicted phase.
- the inverter is connected to the grid to output a current predicted value dq component.
- the actual output current dq components i M,d , i M,q , the corrected grid voltage angular frequency ⁇ ′ M and the inverter output filter inductor value L M calculate the voltage predicted value dq component across the output inductor
- K p and K i are proportional integral regulator parameters in the grid voltage prediction algorithm
- the voltage predicted value dq component across the output inductor of the inverter is utilized.
- the output filter inductance value L M , the inductor equivalent resistance value R M and the corrected grid voltage angular frequency ⁇ ′ M calculate the dq component of the inverter grid-connected output current predicted value
- the duty cycle signals v M, od , v M, oq , DC voltage v M, dc in the dq coordinate system are used , and the voltage prediction value dq component across the output inductor is used. Calculate the dq component of the grid voltage prediction value
- the input power P m, In the actual output current dq components i M,d , i M,q are used to calculate the input power and the output current dq component i M,d ,i
- the ratio of M, q modulus values ⁇ M,k The ratio of M, q modulus values ⁇ M,k :
- the received mixed synchronization signal MixSyn generates a reset signal Reset through the grid phase synchronization module, specifically: the grid phase synchronization module detects a falling edge in the mixed synchronization signal MixSyn to generate a reset signal Reset;
- the maximum value tracking algorithm MVT utilizes the network voltage prediction value dq component Phase-locked result
- the ratio ⁇ M,k , the corrected grid voltage angular frequency ⁇ ′ M,k-1 in the previous step calculates the currently corrected grid voltage angular frequency ⁇ ′ M,k .
- the corrected grid voltage phase ⁇ ' M is calculated using the corrected grid voltage angular frequency ⁇ ' M,k :
- variable with k represents the result of this calculation
- variable with k-1 represents the result of the last calculation
- ⁇ ′ is the value of each change of the angular frequency, which has the value of the switching frequency f M,s and The rated operating frequency f 0 of the grid is obtained:
- M represents the current grid-connected inverter number.
- FIG. 1 is a schematic diagram of a parallel system of multiple inverters including a communication channel according to the present invention
- FIG. 2 is a schematic diagram of a power circuit and various part control algorithms of the inverter 1 of the present invention
- FIG. 3 is a schematic diagram of a power circuit and various part control algorithms of the inverters 2 to N of the present invention
- FIG. 4 is a schematic diagram of a hybrid synchronization signal generation and an inverter 2 to N reset signal generation method in the inverter 1 of the present invention
- FIG. 5 is a flow chart of the maximum value tracking algorithm for correcting the grid voltage angular frequency of the present invention.
- orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is merely a relative relationship for the purpose of describing the structural relationship of the components or components of the present invention, and is not specifically referring to any component or component of the present invention, and may not be construed as a Limitations of the invention.
- the present application provides a voltage-free sampling coordinated control system and method for a multi-grid inverter, when multiple inverters are operated in parallel, only A grid voltage collection device is installed in an inverter, and the collected grid voltage information is shared by the communication method to other parallel-operated inverters, so that the coordinated control of the voltage-free sensors is performed and connected to the grid.
- a voltage-free sampling coordinated control system for a multi-grid inverter includes a plurality of grid-connected inverters and a grid voltage collecting device, and the input of each of the grid-connected inverters The terminals are connected to the renewable power generation unit, and the output terminals of each of the grid-connected inverters are connected to the power grid through a common grid-connected point PCC, and each of the grid-connected inverters is connected to the communication line CH.
- the grid voltage collecting device is installed on one of the grid-connected inverters, and the grid-connected inverter collects grid voltage information through the grid voltage collecting device, and shares it to other grid-connected inverters through the communication line CH, and other grid-connected inverters
- the transformer realizes the grid-connected operation of the voltage-free sensor by using the received shared grid voltage information and the locally collected voltage, current and power information.
- the number of other grid-connected inverters is 2-N
- the output filter inductance value connected to the grid-connected inverter M is defined as L M
- the equivalent resistance value of the inductor is R M
- the three-phase inverter M is three-phase.
- the output current is defined as i M,a , i M,b and i M,c , collectively referred to as i M,abc
- the switching frequency of the grid-connected inverter is defined as f M,s
- the size of the selection is common knowledge in the industry. .
- the inverter 1 includes a power circuit and a controller.
- the power circuit part mainly includes DC-DC converter (DC-DC), DC-AC converter (DC-AC), grid-connected current sampling and grid voltage sampling, and the specific parameter design method is common knowledge in the industry.
- the controller mainly includes an inverter traditional control algorithm and a hybrid pulse generation algorithm.
- v 1, dcref is the reference value of the DC voltage of the inverter, which is used by the DC control module.
- the abc is converted into two-phase currents i 1,d and i 1,q (collectively referred to as i 1,dq ), i 1,dq and reference currents i 1,dref and i 1,qref (collectively i 1, dqref ) for comparison, the duty cycle signal v 1, od and v 1, oq (collectively called v 1, odq ) in the dq coordinate system are generated by the regulator, v 1, odq is inversely transformed by dq/abc and PWM
- the generation module generates a pulse signal and sends it to the power circuit portion.
- the hybrid pulse generation algorithm includes a conventional PWM synchronization signal generation module, a grid phase signal generation module, and a signal combination module.
- the algorithm outputs a mixed synchronization signal MixSyn, and the specific process will be elaborated in the following control method.
- the power circuit part mainly includes a DC-DC converter (DC-DC), a DC AC-DC converter (DC-AC), and grid-connected current sampling.
- DC-DC DC-DC converter
- DC-AC DC AC-DC converter
- grid-connected current sampling DC-DC converter
- the controller mainly includes the inverter traditional control algorithm, the grid voltage prediction algorithm and the grid voltage correction algorithm.
- the traditional control algorithm of the inverter is common knowledge in the industry.
- the maximum power tracking module is used to ensure that the output of the photovoltaic panel is always at the maximum power, and the maximum power tracking module calculates the input power of the inverter P M,in ,v M , dcref is the reference value of the inverter DC voltage, and the DC control module is used to control the DC voltage v M, dc to v M, dcref , ⁇ ′ M is the output result in the grid voltage correction algorithm, and the abc/dq algorithm utilizes ⁇ ′ M converts the three-phase grid-connected current i M, abc into two-phase currents i M,d and i M,q (collectively referred to as i M,dq ), i M,dq and reference current i M in the dq coordinate system .
- Dref is compared with i M,qref (collectively referred to as i M,dqref ), and the duty cycle signals v M,od and v M,oq (collectively referred to as v M,odq ) are generated by the regulator in the dq coordinate system.
- M, odq generates a pulse signal through dq/abc inverse transform and PWM generation module and sends it to the power circuit part.
- the grid voltage prediction algorithm predicts the actual grid voltage phase according to the two-phase sampling current information in the dq coordinate system of the grid-connected inverter and the known inverter output filter parameters.
- the grid voltage correction algorithm receives the mixed synchronization signal MixSyn, sampling.
- the specific process will be elaborated in the following control method.
- a control method based on the above non-voltage sampling coordinated control system for a multi-grid inverter comprising:
- Step 1) After the grid-connected inverter 1 collects the instantaneous value of the grid voltage, the phase-locked loop PLL algorithm is used to obtain accurate grid voltage phase information, and the grid voltage phase information is converted into the pulse signal Syn2;
- Step 2 The grid-connected inverter 1 combines the pulse signal Syn2 with the conventional PWM synchronizing pulse signal Syn1 to generate a mixed synchronizing signal MixSyn including both the grid voltage phase information and the PWM synchronizing information, and transmits the mixed synchronizing signal MixSyn to the other Network inverter 2-N;
- Step 3 The other grid-connected inverter 2-N predicts the actual grid voltage phase according to the collected grid-connected current value and the inverter parameters, and then uses the received mixed synchronization signal MixSyn and the input and output parameter pairs of the inverter. The predicted grid voltage phase is corrected to achieve grid-connected operation of the voltage-free sensor.
- the grid phase generating module 1PU of the inverter 1 receives the phase signal generated by the phase locked loop PLL, and generates the synchronization signal Syn2 when the phase is zero, and the Syn2 changes from 1 to 0 when the phase is 360°. , from 0 to 1 after a machine cycle of a digital signal processor.
- the synchronizing signal Syn1 generated by the Syn2 and the conventional PWM synchronizing signal generating module 1GSU is processed by the signal combining module 1MU to generate a mixed synchronizing signal MixSyn, wherein the rising edge of the Syn1 signal is the rising edge of the mixed synchronizing signal MixSyn signal.
- the falling edge of the Syn2 signal is the falling edge of the mixed sync signal MixSyn.
- the method for generating the Syny1 is the method described in the patent “201410073512.0, Distributed Grid-Connected Inverter Global Synchronous Pulse Width Modulation System and Method”.
- the other grid-connected inverters 2-N predict the actual grid voltage phase through the grid voltage prediction algorithm, and correct the predicted grid voltage phase by the grid voltage correction algorithm.
- the inverter is connected to the grid to output the current predicted value dq component.
- the actual output current dq components i M,d , i M,q , the corrected grid voltage angular frequency ⁇ ′ M and the inverter output filter inductor value L M calculate the voltage predicted value dq component across the output inductor
- K p and K i are the proportional integral regulator parameters in the grid voltage prediction algorithm, and the specific selection method is commonly known in the industry;
- the voltage predicted value dq component across the output inductor of the inverter is utilized.
- the output filter inductance value L M , the inductor equivalent resistance value R M and the corrected grid voltage angular frequency ⁇ ′ M calculate the dq component of the inverter grid-connected output current predicted value
- the duty cycle signal dq components v M, od , v M, oq , DC voltage v M, dc in the dq coordinate system are used , and the voltage prediction value dq component across the output inductor is used. Calculate the dq component of the grid voltage prediction value
- Predicted voltage correction algorithm using the inverter input power P M, In, dq actual output current component i M, d, i M, q calculate the input power and the output current dq components i M, d, i M, q
- the ratio of the modulus values ⁇ M,k The ratio of the modulus values ⁇ M,k :
- the received mixed synchronization signal MixSyn generates a reset signal Reset through the grid phase synchronization module 1RU, specifically: the grid phase synchronization module 1RU detects a falling edge in the mixed synchronization signal MixSyn to generate a reset signal Reset;
- the maximum value tracking algorithm MVT utilizes the network voltage prediction value dq component Phase-locked result
- the ratio ⁇ M,k , the corrected grid voltage angular frequency ⁇ ′ M,k-1 in the previous step calculates the currently corrected grid voltage angular frequency ⁇ ′ M,k .
- the corrected grid voltage phase ⁇ ' M is calculated using the corrected grid voltage angular frequency ⁇ ' M,k :
- the specific steps of the maximum value tracking algorithm MVT are:
- variable with k represents the result of this calculation
- variable with k-1 represents the result of the last calculation
- ⁇ ′ is the value of each change of the angular frequency, which has the value of the switching frequency f M,s and The rated operating frequency f 0 of the grid is obtained:
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Abstract
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Claims (10)
- 一种用于多并网逆变器的无电压采样协调控制系统,其特征在于:包括多个并网逆变器和一个电网电压采集装置,每个所述并网逆变器的输入端均与发电单元连接,每个所述并网逆变器的输出端均通过公共并网点与电网连接,每个所述并网逆变器间均与通讯线路连接,所述电网电压采集装置加装于其中一个并网逆变器上,该并网逆变器通过电网电压采集装置采集电网电压信息,并通过通讯线路共享至其他并网逆变器,其他并网逆变器利用接收到的共享电网电压信息及本地采集的电压、电流和功率信息实现无电压传感器的并网运行。
- 一种基于如权利要求1所述的用于多并网逆变器的无电压采样协调控制系统的控制方法,其特征在于,包括:步骤1)加装电网电压采集装置的并网逆变器采集电网电压瞬时值后,利用锁相环PLL算法获得准确的电网电压相位信息,并将电网电压相位信息转换成脉冲信号Syn2;步骤2)加装电网电压采集装置的并网逆变器将脉冲信号Syn2与传统的PWM同步脉冲信号Syn1结合,生成同时包含电网电压相位信息和PWM同步信息的混合同步信号MixSyn,并将混合同步信号MixSyn传递至其他并网逆变器;步骤3)其他并网逆变器根据采集的逆变器并网电流值和逆变器参数预测实际电网电压相位,再利用接收的混合同步信号MixSyn和逆变器的输入输出参数对预测的电网电压相位进行校正,从而实现无电压传感器的并网运行。
- 如权利要求2所述的一种用于多并网逆变器的无电压采样协调控制系统的控制方法,其特征在于,所述步骤1)中,逆变器的电网相位产生模块接收锁相环PLL产生的相位信号,在相位为零时刻产生同步信号Syn2,Syn2在相位为 360°时由1跳变为0,经过1个数字信号处理器的机器周期后由0变为1。
- 如权利要求2所述的一种用于多并网逆变器的无电压采样协调控制系统的控制方法,其特征在于,所述步骤2)中,Syn2与传统PWM同步信号产生模块产生的同步信号Syn1经过信号结合模块处理产生混合同步信号MixSyn,其中,Syn1信号的上升沿为混合同步信号MixSyn信号的上升沿,Syn2信号的下降沿为混合同步信号MixSyn的下降沿。
- 如权利要求2所述的一种用于多并网逆变器的无电压采样协调控制系统的控制方法,其特征在于,所述步骤3)中,其他并网逆变器通过电网电压预测算法预测实际电网电压相位,并通过电网电压矫正算法对预测的电网电压相位进行校正。
- 如权利要求5所述的一种用于多并网逆变器的无电压采样协调控制系统的控制方法,其特征在于,所述电网电压预测算法为根据并网逆变器dq坐标系下的两相采样电流信息以及已知的逆变器输出滤波参数预测实际的电网电压相位。
- 如权利要求5所述的一种用于多并网逆变器的无电压采样协调控制系统的控制方法,其特征在于,所述电网电压矫正算法为通过接收的混合同步信号MixSyn、并网逆变器实际输出电流和输入功率对电网电压相位进行矫正,并输出经过矫正的电网电压预测相位。
- 如权利要求6所述的一种用于多并网逆变器的无电压采样协调控制系统的控制方法,其特征在于,在电网电压预测算法中,利用逆变器并网输出电流预测值dq分量 实际输出电流dq分量i M,d、i M,q,经修正的电网电压角频率ω′ M和逆变器输出滤波电感值L M计算输出电感两端的电压预测值dq分量其中,K p、K i为电网电压预测算法中的比例积分调节器参数;上述各式的下标中,M表示当前并网逆变器编号,其中M=2,3,……,N。
- 如权利要求7所述的一种用于多并网逆变器的无电压采样协调控制系统的控制方法,其特征在于,在预测电压矫正算法中,利用逆变器输入功率P M,In,实际输出电流i M,d、i M,q计算出输入功率与输出电流i M,d、i M,q模值的比值λ M,k:在预测电压矫正算法中,接收到的混合同步信号MixSyn经过电网相位同步模块1RU产生复位信号Reset,具体为:电网相位同步模块1RU检测出混合同步信号MixSyn中的下降沿时产生复位信号Reset;在预测电压矫正算法中,经矫正后的电网电压相位θ′ M为利用经矫正后的电网电压角频率ω′ M,k计算得到:θ′ M=ω′ M,k·t (1-5)当接收到复位信号Reset时,时间t变为0;上述各式的下标中,M表示当前并网逆变器编号,其中M=2,3,……,N。
- 如权利要求9所述的一种用于多并网逆变器的无电压采样协调控制系统的控制方法,其特征在于,所述最大值追踪算法MVT的具体步骤为:如果λ M,k>λ M,k-1且ω′ M,k<ω′ M,k-1,则执行算法:ω′ M,k=ω′ M,k-1-Δω′如果λ M,k>λ M,k-1且ω′ M,k>ω′ M,k-1,则执行算法:ω′ M,k=ω′ M,k-1+Δω′如果λ M,k<λ M,k-1且ω′ M,k>ω′ M,k-1,则执行算法:ω′ M,k=ω′ M,k-1-Δω′如果λ M,k<λ M,k-1且ω′ M,k<ω′ M,k-1,则执行算法:ω′ M,k=ω′ M,k-1+Δω′其中,带有k的变量表示本次计算结果,带有k-1的变量表示上次计算结果, Δω′为角频率每次改变的数值,其具取值可利用开关频率f M,s和电网额定运行频率f 0求得:
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