1140V级联H桥STATCOM控制策略研究
发布时间：2018-08-01 11:35
【摘要】：随着煤炭工业自动化程度的提高,煤矿井下大量的三相异步电机和电力电子技术设备给煤矿电网带来了大量的无功功率和谐波电流;且大量的电气设备在使用过程中频繁启停导致电网电压波动;另外,供电线路的老化和不平衡负载还会导致三相电压不平衡。级联H桥型静止同步补偿器(STATCOM)是解决上述问题的先进设备,本文对1140V级联H桥STATCOM在无功补偿模式和电压补偿模式下的控制策略进行了研究。首先,为后续控制系统的设计,建立了STATCOM在abc、αβγ、dq0坐标系下的数学模型,并且根据dq0坐标系下的数学模型推导出STATCOM在不平衡工况下的正负序数学模型,然后根据系统性能需求设计主电路的参数。其次,研究无功补偿模式下基于dq0坐标系的解耦控制策略,分析并设计PI控制器以及矢量比例积分器控制器(VPI)。可以将PI控制器和VPI控制器并联组合成PI-VPI控制器。理论和仿真表明PI-VPI控制器相对PI控制器有着更加优良的谐波跟踪性能,更适应于煤矿井下综合治理谐波和无功。直流侧电压控制采用总体控制、相间均压和相内均压三层控制方案。相间均压采用零序电压注入的方法,得到很好地解决;针对载波相移的调制策略,论文采用修正调制波的方法解决相内均压的问题,然后通过仿真验证了所采用的直流侧电压控制方案的有效性。再次,为提高STATCOM动态响应速度,研究无功补偿模式下基于αβγ坐标系的模型电压预测控制策略(MVPC)。结合多电平空间矢量调制技术,提出一种适用于级联H桥STATCOM的模型电压预测控制策略,该策略兼有指令电流跟踪和直流侧电压控制。仿真验证了所提控制策略能够有效地补偿无功电流、谐波电流和不平衡电流,与解耦控制策略相比,除了谐波补偿效果稍差的微弱劣势,优点是省略了调制环节、设计简单、动态响应快。最后,针对煤矿电网的电压不平衡和电压偏差的问题,分析基于双广义积分器锁频环的电压正负序分离原理并给出正负序负载电流的分离方法。对于不平衡工况下的STATCOM直流侧的能量流动分析后给出不平衡工况下的零序电压注入方法以解决相间均压的问题。通过在正负序指令电流上叠加检测到的负载电流,改进了传统的正负序双环控制策略。仿真验证了在面对冲击性不平衡负荷时,所提的方法与传统的正负序双环控制策略相比可以有效地减少公共连接点(point of common coupling,PCC)电压的下降以及迅速地抑制PCC电压不平衡度、将PCC电压不平衡度降低到允许范围内。
[Abstract]:With the improvement of the automation of coal industry, a large number of three-phase asynchronous motors and power electronic equipment in coal mine have brought a lot of reactive power and harmonic current to the coal mine power network. And a large number of electrical equipment frequently start and stop in the process of power grid voltage fluctuations, in addition, the aging and unbalanced load of the power supply line will also lead to three-phase voltage imbalance. Cascaded H-bridge static synchronous compensator (STATCOM) is an advanced device to solve the above problems. In this paper, the control strategy of 1140V cascaded H-bridge STATCOM in reactive power compensation mode and voltage compensation mode is studied. Firstly, in order to design the following control system, the mathematical model of STATCOM in abc, 伪 尾 纬 -dq0 coordinate system is established, and according to the mathematical model of dq0 coordinate system, the positive and negative order mathematical model of STATCOM under unbalanced working condition is derived. Then the parameters of the main circuit are designed according to the system performance requirements. Secondly, the decoupling control strategy based on dq0 coordinate system is studied in reactive power compensation mode. Pi controller and vector proportional integrator controller (VPI). Are analyzed and designed. Pi controller and VPI controller can be combined in parallel to form a PI-VPI controller. The theory and simulation show that the PI-VPI controller has better harmonic tracking performance than Pi controller, and is more suitable for comprehensive control of harmonic and reactive power in coal mine. The DC side voltage control adopts the overall control, the phase-to-phase voltage and the inside-phase voltage three-layer control scheme. The method of zero-sequence voltage injection is used to solve the problem, and the method of correcting modulation wave is used to solve the problem of intra-phase voltage, aiming at the modulation strategy of carrier phase shift. Then the effectiveness of the DC-side voltage control scheme is verified by simulation. Thirdly, in order to improve the dynamic response speed of STATCOM, the model voltage predictive control strategy (MVPC). Based on 伪 尾 纬 coordinate system is studied in reactive power compensation mode. Combined with multilevel space vector modulation, a model voltage predictive control strategy for cascaded H-bridge STATCOM is proposed, which combines command current tracking and DC side voltage control. Simulation results show that the proposed control strategy can effectively compensate reactive current, harmonic current and unbalanced current. Compared with decoupling control strategy, in addition to the weak disadvantage of harmonic compensation, the advantages of the proposed control strategy are omitting the modulation link, and the design is simple. The dynamic response is fast. Finally, aiming at the problem of voltage imbalance and voltage deviation in coal mine power network, the principle of voltage positive and negative sequence separation based on double generalized integrator frequency locking loop is analyzed and the separation method of positive and negative sequence load current is given. Based on the analysis of the energy flow in the DC side of STATCOM under unbalanced operating conditions, a zero-sequence voltage injection method is proposed to solve the problem of phase-to-phase voltage sharing. The traditional positive and negative sequence double loop control strategy is improved by superimposing the detected load current on the positive and negative sequence instruction current. The simulation results show that the proposed method can effectively reduce the decrease of (point of common coupling voltage and reduce the imbalance of PCC voltage rapidly compared with the traditional positive and negative sequence double loop control strategy. Reduce the PCC voltage imbalance to the allowable range.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM761.12
本文编号：2157448
[Abstract]:With the improvement of the automation of coal industry, a large number of three-phase asynchronous motors and power electronic equipment in coal mine have brought a lot of reactive power and harmonic current to the coal mine power network. And a large number of electrical equipment frequently start and stop in the process of power grid voltage fluctuations, in addition, the aging and unbalanced load of the power supply line will also lead to three-phase voltage imbalance. Cascaded H-bridge static synchronous compensator (STATCOM) is an advanced device to solve the above problems. In this paper, the control strategy of 1140V cascaded H-bridge STATCOM in reactive power compensation mode and voltage compensation mode is studied. Firstly, in order to design the following control system, the mathematical model of STATCOM in abc, 伪 尾 纬 -dq0 coordinate system is established, and according to the mathematical model of dq0 coordinate system, the positive and negative order mathematical model of STATCOM under unbalanced working condition is derived. Then the parameters of the main circuit are designed according to the system performance requirements. Secondly, the decoupling control strategy based on dq0 coordinate system is studied in reactive power compensation mode. Pi controller and vector proportional integrator controller (VPI). Are analyzed and designed. Pi controller and VPI controller can be combined in parallel to form a PI-VPI controller. The theory and simulation show that the PI-VPI controller has better harmonic tracking performance than Pi controller, and is more suitable for comprehensive control of harmonic and reactive power in coal mine. The DC side voltage control adopts the overall control, the phase-to-phase voltage and the inside-phase voltage three-layer control scheme. The method of zero-sequence voltage injection is used to solve the problem, and the method of correcting modulation wave is used to solve the problem of intra-phase voltage, aiming at the modulation strategy of carrier phase shift. Then the effectiveness of the DC-side voltage control scheme is verified by simulation. Thirdly, in order to improve the dynamic response speed of STATCOM, the model voltage predictive control strategy (MVPC). Based on 伪 尾 纬 coordinate system is studied in reactive power compensation mode. Combined with multilevel space vector modulation, a model voltage predictive control strategy for cascaded H-bridge STATCOM is proposed, which combines command current tracking and DC side voltage control. Simulation results show that the proposed control strategy can effectively compensate reactive current, harmonic current and unbalanced current. Compared with decoupling control strategy, in addition to the weak disadvantage of harmonic compensation, the advantages of the proposed control strategy are omitting the modulation link, and the design is simple. The dynamic response is fast. Finally, aiming at the problem of voltage imbalance and voltage deviation in coal mine power network, the principle of voltage positive and negative sequence separation based on double generalized integrator frequency locking loop is analyzed and the separation method of positive and negative sequence load current is given. Based on the analysis of the energy flow in the DC side of STATCOM under unbalanced operating conditions, a zero-sequence voltage injection method is proposed to solve the problem of phase-to-phase voltage sharing. The traditional positive and negative sequence double loop control strategy is improved by superimposing the detected load current on the positive and negative sequence instruction current. The simulation results show that the proposed method can effectively reduce the decrease of (point of common coupling voltage and reduce the imbalance of PCC voltage rapidly compared with the traditional positive and negative sequence double loop control strategy. Reduce the PCC voltage imbalance to the allowable range.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM761.12
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