CN111628507A - A Novel Coordinated Control Method of Camera and SVG for Suppressing Transient Overvoltage - Google Patents
A Novel Coordinated Control Method of Camera and SVG for Suppressing Transient Overvoltage Download PDFInfo
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Abstract
本发明公开了一种抑制暂态过电压的新型调相机与SVG协调控制方法。针对直流换相失败及闭锁故障导致送端暂态过电压的情况,提出以下方法:稳态运行时,优化新型调相机与SVG的动态无功储备,故障来临时根据换相失败和闭锁的不同情况,切换调相机与SVG的工作模式,辅之以滤波器的投切控制,尤其使用引入电压‑电流斜率控制的SVG控制环节,通过控制SVG两大运行参数,在新型调相机调压基础上完善暂态过电压抑制能力,达到理想的协调控制效果。本发明有效抑制了直流输电换相失败/闭锁工况下直流输电送端暂态过电压,达到了良好的协调控制电压能力,减少了直流送端风电场风机因暂态过电压的脱网现象。
The invention discloses a novel coordinated control method of a camera and an SVG for suppressing transient overvoltage. Aiming at the situation of transient overvoltage at the sending end caused by DC commutation failure and blocking fault, the following methods are proposed: During steady-state operation, optimize the dynamic reactive power reserve of the new type of camera and SVG, and when the fault occurs, it is based on the difference of commutation failure and blocking. In different situations, switch the working mode of the camera and SVG, supplemented by the switching control of the filter, especially using the SVG control link that introduces the voltage-current slope control, by controlling the two operating parameters of the SVG, on the basis of the voltage regulation of the new camera Improve the transient overvoltage suppression capability to achieve the ideal coordinated control effect. The invention effectively suppresses the transient overvoltage of the DC transmission end under the condition of DC transmission commutation failure/blocking, achieves a good coordinated control voltage capability, and reduces the off-grid phenomenon of the wind farm fans at the DC transmission end due to transient overvoltage .
Description
技术领域technical field
本发明涉及电力系统技术领域,具体是一种抑制暂态过电压的新型调相机与SVG协调控制方法The invention relates to the technical field of power systems, in particular to a novel coordinated control method for a camera and SVG for suppressing transient overvoltage
背景技术Background technique
我国特高压直流送端多为风电等大规模新能源集中开发的弱送端系统,直流输电换相失败、直流闭锁两大主要故障带来的直流送端暂态压升问题愈显突出,严重情况下导致新能源大面积脱网。Most of the UHVDC transmission ends in my country are weak transmission end systems developed by large-scale new energy sources such as wind power. In this case, new energy sources will be disconnected from the grid in a large area.
新型调相机作为旋转设备,能为系统提供短路容量,且调节能力不受系统影响,在提供大容量动态无功支撑等方面具备独特优势。新一代新型调相机在暂态响应和过载能力方面进行了优化,目前具有最快的瞬时无功支撑速度。但新型调相机目前型号单一,配套设备繁多,占地面积巨大,且进相能力相对于迟相能力较差以及自身励磁控制系统响应速度较慢,面对连续换相失败电压波动调节效果不理想,仅靠新型调相机仍不能完全解决前述故障工况下新能源脱网问题。且目前的研究多为将新型调相机安装在直流受端,对直流送端缺乏研究与实际应用。As a rotating device, the new camera can provide short-circuit capacity for the system, and the adjustment capacity is not affected by the system, and has unique advantages in providing large-capacity dynamic reactive power support. The new generation of new camera has been optimized in terms of transient response and overload capability, and currently has the fastest instantaneous reactive power support speed. However, the new type of camera has a single model, a large number of supporting equipment, a huge area, and the phase-advance capability is relatively poor compared with the late-phase capability and the response speed of its own excitation control system is slow, so the adjustment effect of voltage fluctuations in the face of continuous commutation failure is not ideal. , the new type of camera alone cannot completely solve the problem of new energy off-grid under the aforementioned fault conditions. And most of the current research is to install a new type of camera on the DC receiving end, and there is a lack of research and practical application on the DC sending end.
SVG作为当前响应速度最快的电力电子无功补偿设备,克服了传统无源补偿装置响应速度慢、体积大、谐波和损耗大等缺点。但无功调节能力依然受到系统影响,且电力电子元件耐高压能力差。但较于新型调相机拥有配置容量灵活,占地面积小的优点。且能在暂态电压升高后迅速达到满功率吸无功,尤其对直流闭锁后的过电压抑制效果更好。As the fastest reactive power compensation equipment in power electronics, SVG overcomes the shortcomings of traditional passive compensation devices such as slow response, large volume, large harmonics and loss. However, the reactive power regulation ability is still affected by the system, and the power electronic components have poor high voltage resistance. However, compared with the new camera, it has the advantages of flexible configuration capacity and small footprint. And it can quickly reach full power to absorb reactive power after the transient voltage rises, especially for the overvoltage suppression effect after DC blocking.
由于整流站电力电子设备繁多,加装SVG具有潜在的扰动风险,而新型调相机目前仅300Mvar一种,适合高电压等级,其体量对风电场不适用。故只能采取将新型调相机加装在整流站侧,SVG投入各风电场进行就地补偿。但是,如何协调好新型调相机与SVG对直流送端整体的无功调节模式,以达到良好的暂态过电压抑制效果是现阶段急需解决的问题。Due to the variety of power electronic equipment in the rectifier station, the installation of SVG has potential disturbance risks, and the new type of rectifier is currently only 300Mvar, which is suitable for high voltage levels, and its volume is not suitable for wind farms. Therefore, the new type of condenser can only be installed on the side of the rectifier station, and SVG is put into each wind farm for on-site compensation. However, how to coordinate the overall reactive power regulation mode of the new type of camera and SVG on the DC transmission side to achieve a good transient overvoltage suppression effect is an urgent problem to be solved at this stage.
发明内容SUMMARY OF THE INVENTION
针对现有技术的缺陷或改进需求,本发明提供了一种抑制直流送端暂态过电压的新型调相机与SVG协调控制方法,主要包括提出了一种新型调相机与SVG针对抑制直流送端暂态压升效果的协调控制方法,并对该方法的具体参数进行优化调整。结果表明在该协调控制方法提升了新型调相机和SVG的无功支撑效果,并降低了直流输电送端近区风电场母线的暂态过电压,降低风机低压脱网、高压脱网概率,即提高特高压直流输电的安全稳定水平。为实现上述目的,本发明所采取的技术方法是:Aiming at the defects or improvement needs of the prior art, the present invention provides a new type of camera and SVG coordinated control method for suppressing the transient overvoltage of the DC transmission terminal, which mainly includes proposing a new type of camera and SVG for suppressing the DC transmission terminal. The coordinated control method of transient pressure rise effect, and the specific parameters of the method are optimized and adjusted. The results show that the coordinated control method improves the reactive power support effect of the new type of condenser and SVG, reduces the transient overvoltage of the wind farm busbar near the DC transmission end, and reduces the low-voltage off-grid and high-voltage off-grid probability of fans, namely Improve the safety and stability of UHVDC transmission. For achieving the above object, the technical method adopted by the present invention is:
步骤1:整流站侧,稳态运行工况下,新型调相机采取恒无功运行模式。让新型调相机承担一部分整流站正常运行所需无功。为保证滤波器投切母线电压波动不大于1%,新型调相机需保留一定静态无功储备。Step 1: On the side of the rectifier station, under the steady-state operating condition, the new type of condenser adopts the constant reactive power operation mode. Let the new type of rectifier take on a part of the reactive power required for the normal operation of the rectifier station. In order to ensure that the voltage fluctuation of the filter switching busbar is not more than 1%, the new type of camera needs to reserve a certain static reactive power reserve.
步骤2:风电场侧:稳态运行工况下,SVG采取恒无功运行模式。实时监测风电场母线电压Us,对比系统要求风电场母线电压UN,当Us<0.95UN或Us>1.01UN时,风电场侧SVG切换成以1.0UN为恒值的恒电压控制,否则视为可接受的电压波动仍采取恒无功控制。SVG恒电压控制模式采取引入斜率特性的电压调节模式。设置SVG电压-电流控制斜率参数调节器调节斜率参数KD。Step 2: Wind farm side: Under steady-state operating conditions, SVG adopts constant reactive power operation mode. Real-time monitoring of the wind farm bus voltage Us, compared to the wind farm bus voltage U N required by the system, when Us < 0.95 UN or Us > 1.01 UN , the wind farm side SVG switches to constant voltage control with 1.0 UN as the constant value, Otherwise, the voltage fluctuation that is considered acceptable is still controlled by constant reactive power. The SVG constant voltage control mode adopts the voltage regulation mode that introduces the slope characteristic. Set the SVG voltage-current control slope parameter adjuster to adjust the slope parameter K D .
步骤3:当直流输电发生换相失败时,整流站侧新型调相机切换为恒电压控制模式,新型调相机利用其快速暂态响应能力调节整流站母线电压。如果发生连续换相失败,整流站侧滤波器在第二次换相失败时开始切除,否则整流站滤波器不动作。Step 3: When the commutation failure occurs in the DC transmission, the new type of inverter on the rectifier station side switches to the constant voltage control mode, and the new type of inverter uses its fast transient response capability to adjust the bus voltage of the rectifier station. If continuous commutation failure occurs, the filter on the rectifier station side starts to cut off at the second commutation failure, otherwise the rectifier station filter does not act.
步骤4:当直流输电发生换相失败时,风电场侧SVG进入恒电压控制模式,同时调节SVG电压-电流控制斜率参数,增大SVG电压-电流控制斜率参数KD。当电压低于基准值时,适当增加SVG控制系统的电网电压参考值参数Uref;当电压高于基准值时,适当减少SVG控制系统的电网电压参考值参数Uref。Step 4: When the commutation failure occurs in the DC transmission, the SVG on the wind farm side enters the constant voltage control mode, and at the same time adjusts the SVG voltage-current control slope parameter to increase the SVG voltage-current control slope parameter K D . When the voltage is lower than the reference value, the grid voltage reference value parameter U ref of the SVG control system is appropriately increased; when the voltage is higher than the reference value, the grid voltage reference value parameter U ref of the SVG control system is appropriately decreased.
步骤5:当发生直流闭锁,或换相失败最终导致直流闭锁时,直流送端近区电压呈现“急剧升高”的特性。整流站侧新型调相机维持恒电压控制模式,吸收多余无功,同时整流站切除滤波器指令。Step 5: When DC blocking occurs, or commutation failure eventually leads to DC blocking, the voltage in the vicinity of the DC sending end presents a characteristic of "dramatic increase". The new type of condenser on the rectifier station side maintains the constant voltage control mode, absorbs excess reactive power, and at the same time the rectifier station cuts off the filter command.
步骤6:当发生直流闭锁,或换相失败最终导致直流闭锁时,风电场母线电压也呈现“急剧升高”的特性。SVG维持在恒无功模式,控制SVG工作于满感性饱和工作状态,吸收多余无功。Step 6: When DC blocking occurs, or the commutation failure eventually leads to DC blocking, the bus voltage of the wind farm also exhibits the characteristics of "dramatic increase". The SVG is maintained in the constant reactive power mode, and the SVG is controlled to work in a full perceptual saturation working state to absorb excess reactive power.
控制效果:本发明提供的抑制暂态过电压的新型调相机与SVG协调控制方法,其显著优点:Control effect: The novel camera and SVG coordinated control method for suppressing transient overvoltage provided by the present invention has significant advantages:
(1)针对直流输电送端整体,在整流站安装新型调相机,风电场母线侧安装SVG,实现了对直流送端整体无功补偿装置的空间协调优解方案。并对新型调相机和SVG的稳态运行时的参数进行调整,有效提高备用动态无功容量,以达到应对直流送端暂态压升的最佳效果。(1) For the overall DC transmission end, a new type of condenser is installed in the rectifier station, and SVG is installed on the bus side of the wind farm to realize the optimal solution for spatial coordination of the overall reactive power compensation device at the DC transmission end. And the parameters of the new type of camera and SVG during steady-state operation are adjusted to effectively improve the standby dynamic reactive power capacity, so as to achieve the best effect of dealing with the transient voltage rise of the DC sending end.
(2)针对新型调相机进相能力相对薄弱,利用SVG对风电场机端母线进行调压控制,配合新型调相机进一步缓解了直流输电换相失败/直流闭锁情况下风电场机端母线暂态电压突变幅度,通过SVG补足了新型调相机励磁控制延时带来的不利效果。并针对风电场实际运行情况进行控制参数的细节调整,能有效减少换相失败工况下直流送端风机脱网率。(2) In view of the relatively weak phasing capability of the new type of camera, SVG is used to control the voltage of the wind farm’s generator-side busbar, and the new type of camera is used to further alleviate the transient state of the wind farm’s generator-side busbar under the condition of DC transmission commutation failure/DC blocking. The voltage mutation amplitude, through SVG, makes up for the adverse effect of the excitation control delay of the new type of camera. And the detailed adjustment of control parameters is carried out according to the actual operation of the wind farm, which can effectively reduce the off-grid rate of the DC sending end fans under the condition of commutation failure.
(3)在做到新型调相机对整流站、SVG对风电场分别就地补偿的同时,应对直流送端暂态压升,调节新型调相机和SVG应对直流换相失败和直流闭锁两种常见故障工况下的运行模式,达到良好的协调降压效果,并考虑到了新型调相机与整流站滤波器、SVG与风电场内其他无功源的协调控制。(3) While achieving on-site compensation for the rectifier station and SVG for the wind farm, respectively, the new type of condenser and SVG should be used to deal with the transient voltage rise of the DC transmission terminal. The operation mode under fault conditions achieves a good coordinated step-down effect, and takes into account the coordinated control of the new type of condenser and rectifier station filter, SVG and other reactive power sources in the wind farm.
附图说明Description of drawings
下面通过附图,对本发明的技术方案做进一步的详细描述。The technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings.
图1引入斜率控制的SVG控制模型图Figure 1 SVG control model diagram with slope control introduced
图2为SVG电压-电流特性曲线图Figure 2 is the SVG voltage-current characteristic curve
图3为仿真结果连续换相失败情况下风机母线电压变化图Figure 3 shows the variation of the fan bus voltage in the case of continuous commutation failure in the simulation results
图4为仿真结果直流闭锁情况下风机母线电压变化图Figure 4 is the simulation result of the change of the fan bus voltage in the case of DC blocking
图5为仿真结果直流闭锁情况下SVG与新型调相机无功出力图Figure 5 shows the simulation results of the reactive power output of SVG and the new type of camera under the condition of DC blocking.
具体实施方式Detailed ways
为了更好的理解本发明,下面对发明内容进行详细展开说明,并结合说明书附图进行阐释,并给出仿真实例验证本发明的效果。In order to better understand the present invention, the content of the invention is described in detail below, and is explained in conjunction with the accompanying drawings, and a simulation example is given to verify the effect of the present invention.
具体包括以下步骤:Specifically include the following steps:
步骤1:整流站侧,稳态运行工况下,新型调相机采取恒无功运行模式。让新型调相机承担一部分整流站正常运行所需无功。为保证滤波器投切母线电压波动不大于1%,新型调相机需保留一定静态无功储备。Step 1: On the side of the rectifier station, under the steady-state operating condition, the new type of condenser adopts the constant reactive power operation mode. Let the new type of rectifier take on a part of the reactive power required for the normal operation of the rectifier station. In order to ensure that the voltage fluctuation of the filter switching busbar is not more than 1%, the new type of camera needs to reserve a certain static reactive power reserve.
ΔQ=Qf-(Un×1%)/kΔQ=Q f -(U n ×1%)/k
式中:Qf为单个滤波器容量;k为电压与注入系统无功功率之比,即无功电压灵敏度系数;Un为换流站交流母线电压额定值。所以,新型调相机无功出力的最大值和最小值分别为Qmax=Sn-ΔQIn the formula: Q f is the capacity of a single filter; k is the ratio of the voltage to the reactive power injected into the system, that is, the reactive voltage sensitivity coefficient; U n is the AC bus voltage rating of the converter station. Therefore, the maximum and minimum values of the reactive power output of the new type of condenser are Q max =S n -ΔQ respectively
Qmin=Sj-ΔQQ min =S j -ΔQ
式中Sn为新型调相机最大迟相无功;Sj为新型调相机的最大进相无功。In the formula, Sn is the maximum retardation reactive power of the new-type camera; Sj is the maximum phase-advancing reactive power of the new-type camera.
根据新型调相机无功补偿量调节整流站滤波器投入量为:According to the reactive power compensation amount of the new type of rectifier, the input amount of the filter of the rectifier station is adjusted as follows:
Qf=QR-Sn Q f =Q R -S n
式中:Qf为滤波器需发无功;QR为换流阀吸收无功。滤波器投入量为换流阀吸收无功减去新型调相机的设置出力。换流站和新型调相机作为整体对系统交换无功接近0。以此减少直流滤波器投入量,从而直流换相失败/闭锁过剩的无功量减少,新型调相机瞬时无功吸收量得以保证,直流换相失败/闭锁情况下暂态过电压值进一步被抑制。避免了独立控制滤波器和新型调相机造成新型调相机动态回降储备不足的问题。In the formula: Q f is the reactive power required by the filter; Q R is the reactive power absorbed by the converter valve. The input amount of the filter is the reactive power absorbed by the converter valve minus the setting output of the new type of condenser. The converter station and the new type of condenser as a whole exchange reactive power close to 0 to the system. In this way, the input amount of the DC filter is reduced, so that the reactive power of the DC commutation failure/blocking excess is reduced, the instantaneous reactive power absorption of the new camera is guaranteed, and the transient overvoltage value in the case of DC commutation failure/blocking is further suppressed. . It avoids the problem of insufficient dynamic fallback reserve caused by the independent control filter and the new camera.
步骤2:风电场侧:稳态运行工况下,SVG采取恒无功运行模式以降低风电汇集系统电压发生异常振荡的概率。需要注意的是:稳态时风电场系统在调节SVG和风机时,由于SVG快速响应,一般选择优先调节SVG,SVG调节能力不足后,再调节风机;但考虑到直流换相失败及闭锁的风险,需要SVG能提供无功以支撑并网点的电压,故SVG在调节过程要留有一定的无功裕度,设为无功总容量的50%,定为SVG的最优动态无功储备点。实时监测SVG并网点电压Us,对比系统要求风电场母线电压UN,当Us<0.95UN或Us>1.01UN时,无论直流侧是否发生换相失败/闭锁故障,风电场侧SVG一律转换为以1.0UN为恒值的恒电压控制模式,否则视为可接受的电压波动仍采取恒无功控制。SVG恒电压控制模式采取引入斜率特性的电压调节模式。设置SVG电压-电流控制斜率参数调节器,若未发生直流换相失败/闭锁故障仅仅是电压波动,SVG电压-电流控制斜率参数KD取2%。其控制模型如图1。Step 2: Wind farm side: Under the steady-state operating condition, SVG adopts the constant reactive power operation mode to reduce the probability of abnormal oscillation of the voltage of the wind power collection system. It should be noted that when the wind farm system adjusts the SVG and the wind turbine in a steady state, due to the fast response of the SVG, the SVG is generally adjusted first, and the wind turbine is adjusted after the SVG adjustment capability is insufficient; however, considering the risk of DC commutation failure and blocking , SVG is required to provide reactive power to support the voltage of the grid-connected point, so SVG should leave a certain reactive power margin during the adjustment process, which is set to 50% of the total reactive power capacity, which is set as the optimal dynamic reactive power reserve point of SVG . Real-time monitoring of SVG grid-connected point voltage U s , compared with the wind farm bus voltage U N required by the system, when U s < 0.95UN or U s > 1.01UN , no matter whether commutation failure/blocking failure occurs on the DC side, the wind farm side SVGs are always converted to constant voltage control mode with 1.0U N as constant value, otherwise the voltage fluctuation deemed acceptable will still be controlled by constant reactive power. The SVG constant voltage control mode adopts the voltage regulation mode that introduces the slope characteristic. Set the SVG voltage-current control slope parameter regulator. If there is no DC commutation failure/blocking failure, it is only voltage fluctuation, and the SVG voltage-current control slope parameter K D takes 2%. Its control model is shown in Figure 1.
步骤3:当直流输电发生换相失败时,直流送端近区电压呈现“先降低后升高”的特性。整流站侧新型调相机切换为恒电压控制模式,新型调相机利用其快速暂态响应能力调节整流站母线电压,具体表现为:电压下降时,新型调相机根据其强励特性迅速发出大量无功支撑整流站母线电压;电压上升时,新型调相机根据瞬时吸收系统大量无功,降低整流站母线电压。如果发生连续换相失败,整流站侧滤波器在第二次换相失败时开始切除,否则整流站滤波器不动作。Step 3: When the commutation failure occurs in the DC transmission, the voltage in the vicinity of the DC transmission end exhibits the characteristic of "first decrease and then increase". The new rectifier station side switch is switched to the constant voltage control mode. The new rectifier rectifier uses its fast transient response capability to adjust the bus voltage of the rectifier station. The specific performance is: when the voltage drops, the new rectifier quickly emits a large amount of reactive power according to its strong excitation characteristics. Support the bus voltage of the rectifier station; when the voltage rises, the new type of condenser absorbs a large amount of reactive power in the system according to the instantaneous, reducing the busbar voltage of the rectifier station. If continuous commutation failure occurs, the filter on the rectifier station side starts to cut off at the second commutation failure, otherwise the rectifier station filter does not act.
步骤4:当直流输电发生换相失败时,风电场母线电压也呈现“先降低后升高”的特性。SVG进入恒电压控制模式,同时调节SVG电压-电流控制斜率参数调节器,增大SVG电压-电流控制斜率参数KD为5%。当电压低于基准值时,适当增加SVG控制系统的电网电压参考值参数Uref以抬高SVG电压-电流特性,使SVG能快速提供最大容性无功电流;当电压高于基准值时,适当减少SVG控制系统的电网电压参考值参数Uref以降低SVG电压-电流特性,使SVG能快速提供最大感性无功电流。SVG电压-电流特性曲线如说明书附图2。结合说明书附图2做本专利引入斜率控制的SVG优越性说明:Step 4: When the commutation failure occurs in the DC transmission, the bus voltage of the wind farm also exhibits the characteristic of “first decrease and then increase”. The SVG enters the constant voltage control mode, and adjusts the SVG voltage-current control slope parameter regulator at the same time, and increases the SVG voltage-current control slope parameter K D to 5%. When the voltage is lower than the reference value, appropriately increase the grid voltage reference value parameter U ref of the SVG control system to improve the SVG voltage-current characteristics, so that the SVG can quickly provide the maximum capacitive reactive current; when the voltage is higher than the reference value, Appropriately reduce the grid voltage reference parameter U ref of the SVG control system to reduce the SVG voltage-current characteristics, so that the SVG can quickly provide the maximum inductive reactive current. The SVG voltage-current characteristic curve is shown in Figure 2 of the description. Combined with Figure 2 of the description, the advantages of the SVG introduced in this patent with slope control are explained:
(1)调节同样目标,大大地减小所需SVG的额恒无功容量(1) Adjust the same target to greatly reduce the constant reactive power capacity of the required SVG
(2)防止SVG过于频繁地达到其输出无功的最大限值(2) Prevent SVG from reaching the maximum limit of its output reactive power too frequently
(3)在多个SVG并联运行的情况下,有利于各自输出无功功率的合理分配(3) In the case of multiple SVGs running in parallel, it is beneficial to the reasonable distribution of their respective output reactive powers
步骤5:当发生直流闭锁,或换相失败最终导致直流闭锁时,直流送端近区电压呈现“急剧升高”的特性。整流站侧新型调相机维持恒电压控制模式,吸收多余无功,同时整流站切除滤波器指令。Step 5: When DC blocking occurs, or commutation failure eventually leads to DC blocking, the voltage in the vicinity of the DC sending end presents a characteristic of "dramatic increase". The new type of condenser on the rectifier station side maintains the constant voltage control mode, absorbs excess reactive power, and at the same time the rectifier station cuts off the filter command.
步骤6:当发生直流闭锁,或换相失败最终导致直流闭锁时,风电场母线电压也呈现“急剧升高”的特性。检测风电场中的滤波支路是否投入。如果滤波支路是投入状态,则先退出滤波支路。SVG维持在恒无功模式,控制SVG工作于满感性饱和工作状态,吸收多余无功。Step 6: When DC blocking occurs, or the commutation failure eventually leads to DC blocking, the bus voltage of the wind farm also exhibits the characteristics of "dramatic increase". Check whether the filter branch in the wind farm is in operation. If the filter branch is in the enabled state, exit the filter branch first. The SVG is maintained in the constant reactive power mode, and the SVG is controlled to work in a full perceptual saturation working state to absorb excess reactive power.
根据上述具体实施方式,本发明给出以下仿真验证:According to the above-mentioned specific embodiment, the present invention provides the following simulation verification:
仿真验证1:Simulation Verification 1:
本发明所述利用在整流站交流侧母线加装新型调相机,近区部分风电场加装SVG进行协调控制。对比分析没有加新型调相机、整流站增加新型调相机和整流站增加新型调相机同时近区风电场加装SVG在直流输电逆变侧连续发生三次换相失败的母线电压对比图如说明书附图3。其中仿真系统取酒湖直流系统及祁连换流站近区风电场进行仿真实验。According to the invention, a new type of condenser is installed on the AC side busbar of the rectifier station, and SVG is installed in some wind farms in the near area for coordinated control. Comparative analysis of the busbar voltages without adding a new type of condenser, adding a new type of condenser to the rectifier station, and adding a new type of condenser to the rectifier station and adding SVG to the near-area wind farm at the same time. 3. The simulation system takes the Jiuhu DC system and the wind farm near the Qilian converter station for simulation experiments.
以祁连换流站及其近区甘安风电场为例,在祁连换流站加装2台新型调相机,容量各300MVA。在其中一个风电场出口母线甘安62S3加装SVG,容量60MVA。模拟祁韶直流发生连续3次换相失败,对比观察母线甘安62S3在原始情况、仅在祁韶换流站加装新型调相机和整流站加新型调相机同时风电场加SVG的电压波动情况。Taking the Qilian converter station and its nearby Gan'an wind farm as an example, two new-type condensers were installed in the Qilian converter station, each with a capacity of 300MVA. SVG is installed on Gan'an 62S3, the exit bus of one of the wind farms, with a capacity of 60MVA. Simulate three consecutive commutation failures in Qishao DC, and compare and observe the voltage fluctuations of the bus Gan'an 62S3 in the original condition, only installing a new type of condenser at the Qishao converter station, and adding a new type of condenser at the rectifier station while adding SVG to the wind farm.
如说明书附图3所示,从仿真结果可见,在0.2秒第一次换相失败发生时,整流站加装新型调相机情况下,第一次电压起伏的最低电压抬升0.0108p.u.,最高电压降低0.0024p.u.,但由于新型调相机励磁控制系统存在一定延时且存在低励保护,在此后0.6秒第二次换相失败和1.0秒第3次换相失败连续到来时,新型调相机依然能较好的抬升暂态低电压,但在暂态过电压情况下反而增加了母线电压峰值0.0026p.u.。As shown in Figure 3 of the manual, it can be seen from the simulation results that when the first commutation failure occurs in 0.2 seconds, when a new type of camera is installed in the rectifier station, the minimum voltage of the first voltage fluctuation rises by 0.0108p.u., and the maximum voltage decreases. 0.0024p.u., but due to a certain delay in the excitation control system of the new camera and the existence of low excitation protection, when the second commutation failure in 0.6 seconds and the third commutation failure in 1.0 seconds come consecutively, the new camera can still be compared. It is good to lift the transient low voltage, but in the transient overvoltage condition it increases the bus voltage peak value by 0.0026p.u.
而在风电场母线加装SVG后,在新型调相机和SVG协调控制下,第一次换相失败时最低电压抬升0.0224p.u.,最高电压降低0.0124p.u.,且在后续换相失败期间,由于SVG能迅速达到满容量调节,调压效果远好于只有新型调相机的情况。After the SVG is installed on the wind farm bus, under the coordinated control of the new camera and SVG, the minimum voltage rises by 0.0224p.u. and the maximum voltage decreases by 0.0124p.u. during the first commutation failure. It can quickly reach full capacity regulation, and the voltage regulation effect is much better than that of only the new type of camera.
仿真验证2:Simulation verification 2:
依然以祁连换流站及近区甘安风电场母线为例,进行祁韶直流闭锁仿真。设定2s时刻发生直流闭锁。仿真结果如说明书附图4所示,整流站加装新型调相机情况下甘安62S3母线闭锁瞬时电压尖峰降低0.0052p.u.,同时在风电场母线加装SVG后峰值进一步降低0.0020p.u.,后续稳态态电压降低0.0164p.u.,体现出新型调相机联合SVG应对暂态压升强大的控制能力。Still taking the Qilian converter station and the busbar of the nearby Gan'an wind farm as examples, the Qishao DC blocking simulation is carried out. DC blocking occurs at the time of setting 2s. The simulation results are shown in Figure 4 of the manual. When the rectifier station is equipped with a new type of camera, the instantaneous voltage peak of Gan'an 62S3 busbar blocking is reduced by 0.0052p.u., and the peak value is further reduced by 0.0020p.u. after the wind farm busbar is installed with SVG, and the subsequent steady state The voltage is reduced by 0.0164p.u., which reflects the powerful control ability of the new camera combined with SVG to deal with transient voltage rise.
闭锁后新型调相机和SVG无功出力如说明书附图5所示,可以看出由于300MVA新型调相机在低励控制下,无功进一步控制在165Mvar,而SVG过电压过程中吸无功能力超过60Mvar,虽然响应速度略微慢于新型调相机,但可以迅速达到满功率吸无功,两者联合对直流闭锁后稳态过电压有良好的抑制效果。After the lockout, the reactive power output of the new type of camera and SVG is shown in Figure 5 of the manual. It can be seen that because the 300MVA new type of camera is under low excitation control, the reactive power is further controlled at 165Mvar, while the reactive power of the SVG during overvoltage exceeds more than 60Mvar, although the response speed is slightly slower than the new type of camera, it can quickly reach full power and absorb reactive power. The combination of the two has a good suppression effect on steady-state overvoltage after DC blocking.
以上仅为本发明的实施例而已,并不用于限制本发明,凡在本发明的精神和原则之内,所做的任何修改、等同替换、改进等,均包含在申请待批的本发明的权利要求范围之内。The above are only examples of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the application for pending approval of the present invention. within the scope of the claims.
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