新能源发电并网条件下配电系统的电能质量问题与解决方案.ppt

新能源发电并网条件下新能源发电并网条件下配电系统的电能质量问题与解决方案配电系统的电能质量问题与解决方案 Power Quality Problems and Solutions of Distribution System under Grid - connected New Energy Generation李令冬李令冬Lingdong Li20182018年年9 9月月Sep 2018安徽大学教育部电能质量工程研究中心安徽大学教育部电能质量工程研究中心Education ministry power quality Engineering Research Center of Anhui University3 3电力电子装置产生的超高次谐波问题与解决方案电力电子装置产生的超高次谐波问题与解决方案 Problems and Solutions of Ultra - high Harmonic Generated by Power Electronics 1 1摘要摘要 abstract4 4间谐波电流引起的低频功率振荡问题与解决方案间谐波电流引起的低频功率振荡问题与解决方案 Problems and Solutions of Low Frequency Power Oscillation Caused by Inter - harmonic Current 6 目录目录 directory 2 2有功波动引起的电压不稳定问题与解决方案有功波动引起的电压不稳定问题与解决方案 Problems and Solutions of Voltage Instability Caused by Active Power Fluctuation 1 1摘要摘要 abstract 6 问题问题problem 原因原因 cause解决方案解决方案 solution关键技术关键技术 key technology电压不稳定Voltage Instability 有功波动Active Power Fluctuation通过多电源互补和负荷平移减小公共连接点的有功波动Reducing the Active Power Fluctuation of point of common coupling by Multi - power Complementary and Load Translation新能源发电并网条件下的功率潮流仿真与控制技术。Power flow simulation and control technology under the condition of grid connection of new energy generation.低频功率振荡Low Frequency Power Oscillation变频电机群控制的负阻尼特性Negative Damping Characteristics of Variable Frequency Motor Control减小负荷；通过超级电容储能装置减小起振时的间谐波电流；通过变频电机的电流控制减小间谐波电流。Reduce load; Reducing the inter-harmonic current when starting vibration through the super capacitor energy storage device; The inter-harmonic current is reduced by the current control of the variable frequency motor.变频电机的电流控制技术；间谐波功率角高精度测量技术。Current control technology of variable frequency motor;High accuracy measurement technology of inter-harmonic power angle.超高次谐波Ultra - high Harmonic半导体高频开关电路的应用；电缆电容对超高次谐波的放大。Application of Semiconductor High Frequency Switching Circuit；Amplification of Ultra - high Harmonic by Cable Capacitance设置高通滤波器，使电缆电容与系统电源阻抗的并联谐振点移动到谐波很小的频率点上，并使超高次特征谐波的电流系数小于1。A high-pass filter is set to move the parallel resonance point between the cable capacitance and the system power supply impedance to a frequency point where the harmonics are very small, and to make the current coefficient of the ultra-high order characteristic harmonics less than 1.超高次谐波功率角的高精度测量与辨识技术。High accuracy measurement and identification technology of ultra-high harmonic power angle.2 2有功波动引起的电压不稳定问题与解决方案有功波动引起的电压不稳定问题与解决方案Problems and Solutions of Voltage Instability Caused by Active Power Fluctuation 6 仿真电路仿真电路 Simulation circuit广义负荷：在配电网潮流计算中，我们把接在计算节点及以下的用电负荷、分布式电源、储能装置统称为广义负荷广义负荷：在配电网潮流计算中，我们把接在计算节点及以下的用电负荷、分布式电源、储能装置统称为广义负荷.Generalized Load: In the power flow calculation of distribution network, we collectively refer to the power load, distributed power supply and energy storage devices connected to the calculation node and below as generalized load.集中负荷：两个或以上广义负荷的集合称之为集中负荷集中负荷：两个或以上广义负荷的集合称之为集中负荷.Centralized load: a set of two or more generalized loads is called a centralized load.2 2有功波动引起的电压不稳定问题与解决方案有功波动引起的电压不稳定问题与解决方案Problems and Solutions of Voltage Instability Caused by Active Power Fluctuation 6 仿真案例仿真案例 Simulation case110kV传输线送端电压对传输线送端电压对110kV受端电压调整率（受端电压调整率（S=050MVA）Adjustment rate of 110 kV transmission line terminal voltage to 110kv receiving terminal voltage ( s = 0 50Mva )05101520253035404550-10123456广 义 负 载 视 在 相 功 率 S(MVA)电压调整率ku2 %0.950.981超 前 0.95超 前 0.9805101520253035404550-4-3-2-10123广 义 负 载 视 在 相 功 率 S(MVA)电压调整率ku2 %-0.95-0.98-1超 前 -0.95超 前 -0.98高密度高密度新能源发电并网条件下，由于有功的不确定性，即使功率因数很高，电压的波动范围也很大新能源发电并网条件下，由于有功的不确定性，即使功率因数很高，电压的波动范围也很大。Under the condition of grid connection of high-density new energy power generation, due to the uncertainty of active power, even if the power factor is very high, the fluctuation range of voltage is also very large.2 2有功波动引起的电压不稳定问题与解决方案有功波动引起的电压不稳定问题与解决方案Problems and Solutions of Voltage Instability Caused by Active Power Fluctuation 6 仿真案例仿真案例 Simulation case110kV传输线送端电压对传输线送端电压对0.4kV受端电压调整率（受端电压调整率（S=01.5MVA）Adjustment rate of 110 kV transmission line terminal voltage to 0.4kv receiving terminal voltage ( s = 0 1.5Mva )高密度高密度新能源发电并网条件下，由于有功的不确定性，即使功率因数很高，电压的波动范围也很大新能源发电并网条件下，由于有功的不确定性，即使功率因数很高，电压的波动范围也很大。Under the condition of grid connection of high-density new energy power generation, due to the uncertainty of active power, even if the power factor is very high, the fluctuation range of voltage is also very large.00.10.20.30.40.50.60.70.80.911.11.21.31.41.5-15-10-5051015广 义 负 载 视 在 相 功 率 S41(MVA)电压调整率ku41 %0.950.981超 前 0.95超 前 0.9800.10.20.30.40.50.60.70.80.911.11.21.31.41.5-20-15-10-505广 义 负 载 视 在 相 功 率 S41(MVA)电压调整率ku41 %-0.95-0.98-1超 前 -0.95超 前 -0.982 2有功波动引起的电压不稳定问题与解决方案有功波动引起的电压不稳定问题与解决方案Problems and Solutions of Voltage Instability Caused by Active Power Fluctuation 6 解决方案解决方案 Solution（1）从上述案例可知，在高密度新能源并网条件下，由于由于有功的不确定性加大，仅靠动态无功补偿难以保证电压的稳定性，必须把有功控制与无功控制结合起来，才能在一定的条件下保证电压的稳定性。From the above cases, it can be seen that under the condition of high-density new energy grid connection, due to the increased uncertainty of active power, it is difficult to guarantee voltage stabili