低壓微電網(wǎng)分布式單元并聯(lián)運行的控制策略研究
發(fā)布時間：2018-11-11 21:54
【摘要】：可再生能源與儲能裝置、電力電子裝置等相結(jié)合構(gòu)成微電網(wǎng)，逆變器是微電網(wǎng)能夠?qū)崿F(xiàn)并網(wǎng)的電力電子接口，在微電網(wǎng)的運行與控制中起著重要作用。當微電網(wǎng)運行于孤島模式時，下垂控制是實現(xiàn)多DG間功率均分的常用方法，但由于線路阻抗和本地負荷的不一致將會產(chǎn)生環(huán)流，降低系統(tǒng)效率。為了減小或消除環(huán)流、實現(xiàn)各逆變器輸出功率均分，本文提出了基于自適應調(diào)節(jié)下垂系數(shù)的控制方法。 考慮到低壓系統(tǒng)線路阻抗呈阻性，因此該策略是在P-V下垂控制基礎上實現(xiàn)的。實現(xiàn)過程為：以任一臺逆變器為主機，對其采用傳統(tǒng)P-V下垂控制，將其輸出有功功率傳送到從機中，從機以兩臺逆變器輸出有功功率差值來自適應調(diào)節(jié)自身的P-V下垂系數(shù)，最終使系統(tǒng)輸出有功功率一致、系統(tǒng)環(huán)流減小。該策略與現(xiàn)有環(huán)流抑制方法相比簡單易行、輸出電壓精度高并在考慮本地負荷的情況下仍能實現(xiàn)功率均分。 但以上方法的實現(xiàn)需要線路阻抗參數(shù)，同時考慮到在并網(wǎng)模式下線路阻抗檢測準確度受電網(wǎng)等效阻抗(包括電網(wǎng)阻抗和公共耦合點到電網(wǎng)的線路阻抗)的影響，本文提出了在并網(wǎng)模式下考慮電網(wǎng)等效阻抗的多機線路阻抗檢測方法。其采用下垂控制策略并通過參考電壓變化的手段，在構(gòu)建的虛擬單機阻抗網(wǎng)絡等效模型基礎上，實現(xiàn)電網(wǎng)等效阻抗和各線路阻抗的檢測。該檢測方法簡單可靠，，并在考慮了電網(wǎng)等效阻抗的基礎上，只需通過一次擾動便能檢測出電網(wǎng)等效阻抗和各線路阻抗。 以上控制方案通過了仿真和基于TMS320F2812DSP控制芯片的三相逆變器并聯(lián)實驗平臺的驗證，仿真和實驗結(jié)果都驗證了理論分析的準確性和可行性。
[Abstract]:The combination of renewable energy and energy storage devices, power electronic devices and so on constitutes a microgrid. The inverter is a power electronic interface that can be connected to the grid, and plays an important role in the operation and control of microgrid. When microgrid operates in isolated island mode, droop control is a common method to realize power equalization between multiple DG. However, because of the inconsistency of line impedance and local load, circulation will be produced and system efficiency will be reduced. In order to reduce or eliminate the circulation and realize the average output power distribution of each inverter, a control method based on adaptive regulation of sag coefficient is proposed in this paper. Considering that the line impedance of low voltage system is resistive, this strategy is realized on the basis of P-V droop control. The realization process is as follows: take any inverter as the host, adopt the traditional P-V droop control, and transfer the output active power to the slave. The difference of active power output from two inverters comes from adjusting their P-V sag coefficient, which finally makes the output active power of the system consistent and the circulation of the system reduced. Compared with the existing current suppression methods, the proposed strategy is simple and feasible, with high output voltage accuracy and the ability to achieve power equalization even when local load is taken into account. However, the realization of the above method requires line impedance parameters, and considering that the accuracy of line impedance detection in grid-connected mode is affected by the equivalent impedance of the power network (including the network impedance and the line impedance from the common coupling point to the power network). In this paper, a multi-machine line impedance detection method considering grid equivalent impedance in grid-connected mode is proposed. Based on the virtual single-machine impedance network equivalent model, the equivalent impedance of the power network and the impedance of each line can be detected by using the droop control strategy and the reference voltage variation method. The method is simple and reliable. On the basis of considering the equivalent impedance of the power network, the equivalent impedance and the impedance of each line can be detected by only one disturbance. The control scheme is verified by simulation and parallel experiment platform of three-phase inverter based on TMS320F2812DSP control chip. Both simulation and experimental results verify the accuracy and feasibility of theoretical analysis.
【學位授予單位】：燕山大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM732
本文編號：2326244
[Abstract]:The combination of renewable energy and energy storage devices, power electronic devices and so on constitutes a microgrid. The inverter is a power electronic interface that can be connected to the grid, and plays an important role in the operation and control of microgrid. When microgrid operates in isolated island mode, droop control is a common method to realize power equalization between multiple DG. However, because of the inconsistency of line impedance and local load, circulation will be produced and system efficiency will be reduced. In order to reduce or eliminate the circulation and realize the average output power distribution of each inverter, a control method based on adaptive regulation of sag coefficient is proposed in this paper. Considering that the line impedance of low voltage system is resistive, this strategy is realized on the basis of P-V droop control. The realization process is as follows: take any inverter as the host, adopt the traditional P-V droop control, and transfer the output active power to the slave. The difference of active power output from two inverters comes from adjusting their P-V sag coefficient, which finally makes the output active power of the system consistent and the circulation of the system reduced. Compared with the existing current suppression methods, the proposed strategy is simple and feasible, with high output voltage accuracy and the ability to achieve power equalization even when local load is taken into account. However, the realization of the above method requires line impedance parameters, and considering that the accuracy of line impedance detection in grid-connected mode is affected by the equivalent impedance of the power network (including the network impedance and the line impedance from the common coupling point to the power network). In this paper, a multi-machine line impedance detection method considering grid equivalent impedance in grid-connected mode is proposed. Based on the virtual single-machine impedance network equivalent model, the equivalent impedance of the power network and the impedance of each line can be detected by using the droop control strategy and the reference voltage variation method. The method is simple and reliable. On the basis of considering the equivalent impedance of the power network, the equivalent impedance and the impedance of each line can be detected by only one disturbance. The control scheme is verified by simulation and parallel experiment platform of three-phase inverter based on TMS320F2812DSP control chip. Both simulation and experimental results verify the accuracy and feasibility of theoretical analysis.
【學位授予單位】：燕山大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM732
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