CN108173288B - Voltage type impedance adapter control method for inhibiting multi-inverter grid-connected system resonance - Google Patents
Voltage type impedance adapter control method for inhibiting multi-inverter grid-connected system resonance Download PDFInfo
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Abstract
The invention provides voltage type impedance adapter control methods for restraining multi-inverter grid-connected system resonance, which comprises the steps of sampling voltage and current of a voltage type impedance adapter, wherein the voltage type impedance adapter is realized by setting virtual harmonic impedance to obtain a virtual harmonic voltage instruction value and obtaining PWM (pulse-width modulation) modulation waves through a voltage controller to realize no-difference tracking of the instruction value.
Description
Technical Field
The invention relates to a control method of voltage type impedance adapters for restraining resonance of a multi-inverter grid-connected system.
Background
In recent years, renewable energy grid-connected power generation systems represented by photovoltaic and wind power have been rapidly developed. However, the inverter damping strategy may be disabled due to equivalent grid impedance formed by non-negligible distribution parameters in a transformer and a long-distance transmission line in the multi-inverter grid-connected power generation system, so that resonance between the multi-inverter grid-connected power generation system and a grid is excited. In addition, the multi-inverter grid-connected power generation system is often in a weak power grid environment, and the amplitude of the power grid impedance changes greatly, so that the inverter in the grid-connected power generation system is strongly coupled with the power grid impedance, and the resonance problem of the system is caused. Harmonic waves of the multi-inverter grid-connected power generation system become more complex due to the existence of a plurality of parallel inverters, the characteristic that the harmonic waves are mainly low-frequency and specific subharmonic waves in the past is gradually presented as a wide frequency domain characteristic, harmonic wave oscillation in the system is easily excited, harmonic wave amplification is caused, and the problem of system instability is caused. More efficient forms and methods are therefore sought for globally suppressing the resonance of a multi-inverter grid-connected power generation system. And the impedance adapter is used for suppressing resonance and harmonic waves by reshaping and adapting the impedance of the system at a system-level angle.
At present, there are many academic papers at home and abroad for analysis and solution, for example:
document 1 "Li F, Zhang X, Zhu H, et al. harmonic reduction through reactive and inductive harmonic impedance [ C].Electrical Machines and Systems(ICEMS),2014 17thIEEE 2014:1385 & 1388. ("harmonic reduction by resistance and inductance — IEEE 17 th International Conference corpus 2014);
document 2 "impedance adjusting method for improving the robustness of the LCL type grid-connected inverter to the grid impedance" (reported in motor engineering of china 2015,35, 179-204.);
document 3 "study of harmonic current amplification effect when bang, delke, tree, etc. parallel type APF compensates voltage source type nonlinear load [ J ]. chinese institute of electrical engineering, 2011, 31 (27): 21-28';
document 4 Wang X, Blaabjerg F, Liserre M.an active dam to suppress resonance frequencies [ J ]. IEEE Press,2014: 2184. 2191. ("resonance of impedance adapter suppressing multiple unknown frequencies" -IEEE published proceedings of 2014);
document 5 Wang X, Blaabjerg F, Liserre M, et al, active data for stabilizing Power Electronics-based AC systems [ J ]. Power Electronics, IEEETransactions on,2014,29(7):3318-3329. ("impedance adapter for stabilizing AC Power system" -IEEE Power Electronics journal of 2014);
document 6 Wang X, Pang Y, Loh P C, et al. A Series-LC-Filtered Active Dampor with Grid emission for AC Power-Electronic-Based Power Systems [ J ]. IEEE Transactions on Power Electronics,2015,30(8):4037-4041. ("Series LC filter impedance adapter with Grid immunity Based on AC Power system — IEEE Power Electronics journal of 2014);
document 1 proposes new resistance and inductance series harmonic impedances, which are more robust in harmonic suppression than resistance harmonic impedances, document 2 proposes grid impedance adjusting methods with parallel RC branches at the point of common coupling, which can ensure the grid inverter to adapt to wide variations of the grid impedance, so that the adjusted grid impedance and the output impedance of the grid inverter always meet the stability criteria based on impedance, document 3 proposes new power electronic devices for dynamic harmonic suppression and reactive compensation, which can perform fast tracking compensation on harmonics of different amplitudes and frequencies, document 4 proposes to use impedance adapters to suppress multiple unknown frequencies of resonance, document 5 simplifies the control process of resistance values at resonance frequencies using direct resonance voltage compensation methods for two control schemes that analyze impedance adapters, document 6 proposes to use low power inverters with LC series filters to implement impedance adapters, which increases the capacitance values of the series filters to help withstand the majority of the system voltages, thus reducing the dc side voltages required by the impedance adapters.
Through studies of the above documents, we consider that the prior art also has the following problems:
(1) the current-mode impedance adapter has limited capability of inhibiting the resonance of the grid-connected system because the current-mode impedance adapter has difficulty in realizing smaller virtual harmonic impedance under the condition of weak grid due to the limitation of the stability of the current-mode impedance adapter.
(2) The impedance adapter studied above is limited to the current mode, and the resonance and harmonic suppression effects of other types of impedance adapters on the multi-inverter grid-connected system are not considered.
Disclosure of Invention
The invention aims to solve the problem of system instability caused by resonance and harmonic in a multi-inverter grid-connected system, and particularly provides voltage type impedance adapter control realization methods for restraining the resonance and harmonic in the multi-inverter grid-connected system.
The object of the invention is thus achieved.
The invention provides voltage type impedance adapter control methods for inhibiting multi-inverter grid-connected system resonance, which realize the virtualization of harmonic impedance through a voltage type impedance adapter, thereby completing the remodeling of grid impedance of a grid-connected point to inhibit the resonance and harmonic of the multi-inverter grid-connected system, and comprises the following specific steps:
step 1, sampling the output current i of the voltage type impedance adapter in real timeVThe output voltage of the real-time sampling voltage type impedance adapter is UC_V；
Step 2, obtaining the output current i of the voltage type impedance adapter through real-time sampling according to the step 1VObtaining the output harmonic current i of the voltage type impedance adapter through the filterVhAnd (3) obtaining the output voltage U of the voltage type impedance adapter through real-time sampling according to the step 1C_VObtaining the output harmonic voltage U of the voltage type impedance adapter through the filterC_Vh；
Step 3, according to the voltage type impedance adapter output obtained in the step 2Harmonic current iVhAnd calculating to obtain the virtual harmonic voltage command value of the voltage type impedance adapter
The calculation formula is as follows:
wherein Z isAD_VIs the virtual harmonic impedance value of the voltage mode impedance adapter;
step 4, obtaining the virtual harmonic voltage instruction value of the voltage type impedance adapter obtained in the step 3
And the voltage type impedance adapter obtained in the step 2 outputs harmonic voltage UC_VhThe result of the subtraction was set to voltage error △ U* AD_V，△U* AD_V＝U* AD_V-UC_Vh；
Step 5, the voltage error obtained in the step 4 is comparedThe voltage controller outputs PWM modulation waves to realize the no-difference tracking of the voltage instruction value;
and 6, returning to the step 1, and entering the next cycles.
Preferably, the voltage-type impedance adapter is characterized in that the voltage-type impedance adapter is formed by power electronic converters, and the voltage-type impedance adapter is connected in parallel at a common coupling point of the multi-inverter grid-connected power generation system.
Compared with the prior art, the invention has the following beneficial effects:
1) the voltage type impedance adapter can virtualize a very small virtual harmonic impedance at a grid-connected point, so that the impedance of the grid-connected point is reshaped and adapted, and the resonance and harmonic amplification of the grid-connected point are inhibited;
2) in the case of a weak power grid, the virtual harmonic impedance function of the voltage-mode impedance adapter is easier to implement than that of a current-mode impedance adapter. In the case of parallel connection, the smaller the virtual impedance, the better the resonance suppression effect on the system grid-connected point.
3) The voltage-type impedance adapter is formed by voltage source type power electronic converters, so that the voltage-type impedance adapter is equivalent to small impedances and has a good absorption function on harmonic waves of a multi-inverter grid-connected system;
drawings
FIG. 1 is a block diagram of a voltage source impedance adapter according to an embodiment of the present invention;
FIG. 2 is a flow chart of an implementation of the control method described herein;
FIG. 3 is a waveform of phase voltage at resonance of a multi-inverter grid-connected power generation system;
FIG. 4 is a THD analysis of the phase voltage of the multi-inverter grid-connected power generation system resonance;
FIG. 5 is a waveform of a phase voltage for resonance suppression by a voltage source impedance adapter for a multiple inverter grid-connected power generation system;
FIG. 6 is a THD analysis of the voltage mode impedance adapter for the phase voltage of the multi-inverter grid-connected power generation system resonance suppression;
Detailed Description
In the present example, a system composed of two grid-connected inverters and a voltage-type impedance adapter in simulation software Matlab/Simulink is taken as an example, and voltage-type impedance adapter control methods for suppressing the resonance of a multi-inverter grid-connected system are explained.
FIG. 1 is a topological structure diagram of a voltage source impedance adapter in an embodiment of the invention, and as can be seen from the diagram, the voltage source impedance adapter is composed of power electronic converters which are connected in parallel with a common coupling point of a grid-connected power generation system, and comprises a direct-current side capacitor C, a three-phase full bridge and a three-phase LVCVA filter circuit, a DC side capacitor C, a three-phase full bridge and a filter circuit LVCVSequentially connecting;
specifically, the invention is firstly built in simulation software Matlab/Simulink according to the figure 1The topology of the proposed voltage-mode impedance adapter. Two 10KW grid-connected inverters are used instead of the multi-inverter grid-connected power generation system shown in fig. 1, and a 10KW voltage source type converter is used to implement the voltage type impedance adapter. Switching frequency f of grid-connected inverterwi＝4000HZFundamental frequency foi＝50HZThe voltage at the DC side is UdcAn LC filter is used at 850V, with the bridge side inductance L1 being L23mH, filter capacitance is C1＝C240 uF. Switching frequency f of voltage-type impedance adapterw16000Hz, fundamental frequency fo50Hz, LC filter with bridge side inductance LV0.9mH, filter capacitance CV12.3 uF. The voltage type impedance adapter is directly connected in parallel with a common coupling point in the simulation of the grid-connected system model. Virtual harmonic impedance Z of voltage mode impedance adapterAD_V3 Ω. The effective value of the voltage of the network side line is Ug380V, network impedance Zg＝0.9mH。
Fig. 2 is a flowchart illustrating an implementation of methods for controlling a voltage-type impedance adapter for suppressing multiple inverter grid-connected system resonance, which can be seen from the flowchart, in which the method implements the virtualization of harmonic impedance through the voltage-type impedance adapter, thereby completing the remodeling of grid impedance of a grid-connected point to suppress the multiple inverter grid-connected system resonance and harmonic, and includes the following specific steps:
step 1, sampling the output current i of the voltage type impedance adapter in real timeVThe output voltage of the real-time sampling voltage type impedance adapter is UC_V；
Step 2, obtaining the output current i of the voltage type impedance adapter through real-time sampling according to the step 1VObtaining the output harmonic current i of the voltage type impedance adapter through the filterVhAnd (3) obtaining the output voltage U of the voltage type impedance adapter through real-time sampling according to the step 1C_VObtaining the output harmonic voltage U of the voltage type impedance adapter through the filterC_Vh；
Step 3, outputting harmonic current i according to the voltage type impedance adapter obtained in the step 2VhAnd calculating to obtain the virtual harmonic of the voltage type impedance adapterVoltage command value
The calculation formula is as follows:
wherein Z isAD_VIs the virtual harmonic impedance value of the voltage mode impedance adapter; zAD_VTo set value, in this embodiment, ZAD_V＝3Ω。
Step 4, obtaining the virtual harmonic voltage instruction value of the voltage type impedance adapter obtained in the step 3
And the voltage type impedance adapter obtained in the step 2 outputs harmonic voltage UC_VhThe result of the subtraction is set as a voltage error
Step 5, the voltage error obtained in the step 4 is comparedThe voltage controller outputs PWM modulation waves to realize the no-difference tracking of the voltage instruction value;
and 6, returning to the step 1, and entering the next cycles.
FIG. 3 is a waveform of phase voltage at resonance of a multi-inverter grid-connected power generation system; fig. 4 is a THD analysis of a phase voltage of a multi-inverter grid-connected power generation system resonance, wherein the fundamental amplitude of the phase voltage is 232.2V, and the THD is 50.94%; FIG. 5 is a waveform of a phase voltage for resonance suppression by a voltage source impedance adapter for a multiple inverter grid-connected power generation system; fig. 6 is a THD analysis of the voltage source impedance adapter for the phase voltage of the multi-inverter grid-connected power generation system resonance suppression, in which the fundamental amplitude of the phase voltage is 232.2V, and THD is 0.48%. Namely, under the condition that a multi-inverter grid-connected power generation system resonates and under the same parameters and simulation conditions, the difference of the resonance suppression effect of the voltage-type impedance adapter on the photovoltaic grid-connected system under the two conditions of before and after switching is observed, the suppression effect of the voltage-type impedance adapter on the resonance of the photovoltaic grid-connected power generation system can be found to be very obvious, and the effectiveness of the voltage-type impedance adapter in control and implementation is proved.
In conclusion, the voltage type impedance adapter can present excellent resonance and harmonic suppression capability, and has the feasibility of .
Claims (2)
- The control method is characterized in that the control method realizes the virtualization of harmonic impedance through the voltage-type impedance adapter, thereby completing the remodeling of grid impedance of a grid-connected point and inhibiting the resonance and the harmonic of the multi-inverter grid-connected system, and comprises the following specific steps:step 1, sampling the output current i of the voltage type impedance adapter in real timeVThe output voltage of the real-time sampling voltage type impedance adapter is UC_V；Step 2, obtaining the output current i of the voltage type impedance adapter through real-time sampling according to the step 1VObtaining the output harmonic current i of the voltage type impedance adapter through the filterVhAnd (3) obtaining the output voltage U of the voltage type impedance adapter through real-time sampling according to the step 1C_VObtaining the output harmonic voltage U of the voltage type impedance adapter through the filterC_Vh；Step 3, outputting harmonic current i according to the voltage type impedance adapter obtained in the step 2VhAnd calculating to obtain the virtual harmonic voltage command value of the voltage type impedance adapterThe calculation formula is as follows:
wherein Z isAD_VIs the virtual harmonic impedance value of the voltage mode impedance adapter;step 4, obtaining the product obtained in the step 3Virtual harmonic voltage command value of voltage type impedance adapterAnd the voltage type impedance adapter obtained in the step 2 outputs harmonic voltage UC_VhThe result of the subtraction is set as a voltage error
Step 5, the voltage error obtained in the step 4 is comparedThe voltage controller outputs PWM modulation waves to realize the no-difference tracking of the voltage instruction value;
and 6, returning to the step 1, and entering the next cycles. - 2. The method for controlling the voltage-type impedance adapter used to suppress the resonance of multi-inverter grid-connected system according to claim 1, wherein the voltage-type impedance adapter is composed of power electronic converters, and the voltage-type impedance adapter is connected in parallel to the common coupling point of the multi-inverter grid-connected system.
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| CN109167385B (en) * | 2018-08-31 | 2020-12-29 | 合肥工业大学 | Control method of composite impedance adapter system |
| CN109638894B (en) * | 2019-01-31 | 2022-05-31 | 张欣 | Series self-adaptive stabilizer used between grid-connected inverter and weak grid |
| CN110138246B (en) * | 2019-05-30 | 2020-11-13 | 东北电力大学 | Impedance remodeling method based on three-level Dual-Buck circuit |
| CN110912182B (en) * | 2019-10-21 | 2022-10-04 | 合肥工业大学 | Design method of virtual resistance parameters of parallel impedance adapter |
| CN111682578B (en) * | 2020-05-09 | 2022-02-18 | 杭州电子科技大学 | Three-phase harmonic resonance suppression device and suppression method |
| CN111682579B (en) * | 2020-05-09 | 2022-02-11 | 杭州电子科技大学 | Single-phase harmonic resonance optimization suppression device and suppression method |
| CN112271750B (en) * | 2020-10-13 | 2022-06-17 | 上海海事大学 | Method for identifying internal unstable inverter in multi-parallel inverter system |
| CN113224760B (en) * | 2021-05-07 | 2022-04-12 | 南方电网科学研究院有限责任公司 | Parameter design method of series passive impedance adapter suitable for flexible direct current |
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