CN104779644B - A wind farm grid stability assessment method - Google Patents

A wind farm grid stability assessment method Download PDF

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CN104779644B
CN104779644B CN201510226969.5A CN201510226969A CN104779644B CN 104779644 B CN104779644 B CN 104779644B CN 201510226969 A CN201510226969 A CN 201510226969A CN 104779644 B CN104779644 B CN 104779644B
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wind farm
wind
power
grid
oscr
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CN104779644A (en
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唐彬伟
赵亮
随德光
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北京天源科创风电技术有限责任公司
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02E10/763Power conversion electric or electronic aspects for grid-connected applications

Abstract

本发明是有关于一种风电场并网稳定性评估方法,包括以下步骤:数据采集与存储,采集主变低压侧的母线电压、有功功率和无功功率并存储;计算系统运行的短路容量Skosc;电网稳定性评估,令OSCR为k时刻风电场运行短路容量比,n为风电场内机组数,Pd为单台风力发电机组额定容量,则有:Pt=n×Pd,当3≥OSCR>n1时,调整自动无功补偿设备的控制参数,当n1≥OSCR>n2时,调整全功率变流器的控制参数,当n2≥OSCR时,减少同时并网机组的台数,所述n1取值在2‑3之间,n2取值参考IEEE Std1204‑1997标准。 The present invention relates to a wind farm grid stability evaluation method, comprising the steps: data acquisition and storage, acquisition becomes the main low-pressure side of the bus voltage, active power and reactive power and storage; short circuit capacity calculating system operation Skosc ; assessment grid stability, so that the moment the wind farm is k OSCR short-circuit capacity ratio, n-number of wind field units, Pd single rated capacity of wind power generators, there are: Pt = n × Pd, when 3≥OSCR> when n1, no automatic adjustment of the control parameters of the power compensation device, when n1≥OSCR> when n2, full power adjust control parameters of the converter, when n2≥OSCR, and at the same time reducing the number of network units, the value of n1 between 2-3, n2 IEEE Std1204-1997 standard reference value. 利用本发明可以及时检测到电网的运行状态,有利于及时采取相关措施减少损失。 The invention can be detected in time to run the state power grid, it is conducive to take timely measures to reduce losses.

Description

一种风电场并网稳定性评估方法 A wind farm grid stability assessment method

技术领域 FIELD

[0001] 本发明涉及风电场并网技术领域,特别是涉及一种风电场并网稳定性评估方法。 [0001] The present invention relates to a wind farm grid technology, and particularly, to a wind farm grid stability assessment method.

背景技术 Background technique

[0002] 随着能源危机的日趋严重,可再生能源的大力发展,全球风电装机容量以平均每年高于20%的速度增长,风力发电已经成为具有相当规模的产业。 [0002] With the increasingly serious energy crisis, vigorously develop renewable energy, global wind power installed capacity at an annual average rate of more than 20% growth in the wind power industry has become a considerable scale. 截止2013年年底,全球风力发电累计装机容量已达到3.18亿千瓦,共安装有三百多个风电场。 By the end of 2013, global cumulative wind power installed capacity has reached 318 million kilowatts, a total installed wind farms have more than three hundred. 大规模风电场直接接入电网使得风力发电电量在电网中所占比例越来越大,为电力系统带来发展机遇的同时, 也给其安全稳定运行及调度控制等诸多方面带来了新的挑战。 Large-scale wind farms connected to the grid so that direct wind power in the grid in a growing proportion, bring development opportunities for the power system, but also brought new to its safe and stable operation and scheduling control, and many other aspects of challenge.

[0003] 随着风机并网技术的发展,越来越多的风机厂商采用了全功率变流器的并网方式,而风电场内无功补偿设备亦采用SVC和SVG。 [0003] With the development of grid-connected wind turbine technology, an increasing number of wind turbine manufacturers with a full power converter and grid mode, and a wind farm reactive power compensation device SVC also adopted and SVG. 全功率变流器和SVC及SVG均属于FACTS设备,高压直流输电对并网短路容量比有一定要求。 Full power converter and SVG belong SVC and FACTS devices, HVDC volume ratio of short-circuited, and there are certain requirements. 在短路容量比小的系统中易出现电网振荡、动态过压、谐振等问题,这些电网故障状态都将影响风机的正常运行。 Prone to oscillation power system short-circuit capacity smaller than, the dynamic overpressure, resonance and so on, the grid fault condition which will affect the normal operation of the fan. 特别是电网振荡, 不仅使风机报出故障停机,影响机组的可利用率,在振荡严重的地区甚至会影响到机组内的用电设备和升压站的一次二次设备。 In particular power swing, not only the fans reported downtime, affecting the availability of the unit, the oscillation hit areas even affect the primary and secondary booster station equipment electrical equipment within the unit. 虽然通过仿真计算可以求出系统的短路容量和风电场并网的短路容量比,但仿真结果的准确性取决于仿真模型的准确性。 Although it is possible to obtain a short-circuit capacity of the wind farm system through simulation and short-circuit capacity than the net, but the accuracy of the simulation results depends on the accuracy of the simulation model. 目前大型电力系统机电暂态仿真软件中均没有成熟的全功率变流器风电场机组并网模型,已经影响了结果的准确性。 Currently large-scale power system electromechanical transient simulation software was not mature full-power converter unit grid model wind farm, it has affected the accuracy of the results. 而电力系统的运行方式是时刻改变的,随着系统运行方式的改变风电场的短路容量比也会随之改变,无法定量地知晓目前风电场并网接入的短路容量比。 The mode of operation of the power system is a time of change, with the short circuit capacity to change the mode of operation of the wind farm will change the system than can not be quantitatively know the short circuit capacity than the current wind farm grid access.

[0004] 另外,专利CN 101349731 B也提到了一种电压稳定性实时评估方法,该专利的缺点是其所提到方法的准确性取决于系统模型的准确性,风电场通常亦不可能获得电网数。 [0004] Further, Patent CN 101349731 B also mentioned a method for real time assessment of voltage stability, a disadvantage of this patent is that the accuracy of the system depends on the accuracy of the information model mentioned method, a wind farm typically also possible to obtain the grid number. 因此该方法仅可以应用于电网调度中,无法在风电场端进行实施,且判断稳定性仅以线路潮流指标作为考核指标,未考虑到全功率变流器及SVC、SVG并网短路容量比的作用。 Thus the method may be applied to only the scheduling grid, it can not be implemented at the end of the wind farm, and the flow line is determined only by the stability index as markers, not taking into account the full power converter and SVC, SVG and short-circuited, the capacity ratio effect.

[0005] 由此可见,上述现有的一种电压稳定性实时评估方法在使用上,显然存在不便与缺陷,而亟待加以进一步改进。 [0005] Thus, the above-described conventional voltage stability of a real-time evaluation on the method used, clearly there is an inconvenience and defects, and the urgent need to be further improved. 如何能创设一种应用于风电场中,基于在线运行数据对风电场并网接入的短路容量比进行计算,并据此评估风电场并网稳定性的一种风电场并网稳定性评估方法,实属当前重要研发课题之一。 How to create one kind can be applied to a wind farm, the wind farm network access and short-circuit capacity ratio is calculated based on the data line operation, to assess wind farms for a wind farm grid stability Stability Evaluation Method , it is currently one of the important research topics.

发明内容 SUMMARY

[0006] 本发明要解决的技术问题是提供一种风电场并网稳定性评估方法,使其可以及时发现电网的运行状态,利于及时采取相关措施减小损失,从而克服现有技术的不足。 [0006] The present invention to solve the technical problem of providing a wind farm grid stability assessment method so that it can detect the operating state of the power grid, which will help to take timely measures to reduce the losses to overcome deficiencies of the prior art.

[0007] 为解决上述技术问题,本发明一种风电场并网稳定性评估方法,包括以下步骤:数据采集与存储,采集主变低压侧的母线电压、有功功率和无功功率并存储;计算短路容量, 设定在k时刻,系统的等效电势为Ek = Ekx+jEky,等效阻抗为Zk = Rk+jXk,风电场主变低压侧的电流电压幅值为Vk,有功功率的负为Pk,无功功率的负为Qk,系统运行的短路容量为Sk〇s。 [0007] To solve the above problems, the present invention is for a wind farm grid stability evaluation method, comprising the steps: data acquisition and storage, acquisition becomes the main bus voltage low voltage side, and the active and reactive power storage; calculated short circuit capacity set in the time k equivalent potential, the system is Ek = ekx + jEky, the equivalent impedance Zk = Rk + current voltage magnitude jXk, wind farm main transformer for the low voltage side Vk is, active power is negative negative Pk, reactive power is Qk, short-circuit capacity of the system operation is Sk〇s. ;设定在k-Ι时刻,系统的等效电势为Eh = E x+jE y,系统的等效阻抗为Zh = Rk-d jXH, 风电场主变低压侧的电流电压幅值为Vk-l·,有功功率的负为Pk-l·,无功功率的负为Qk-l·,则让时刻系统运行短路容量为: ; K-Ι set time, a potential equivalent to the system equivalent impedance Eh = E x + jE y, the system of Zh = Rk-d jXH, current wind farm main transformer voltage amplitude of the low-pressure side is Vk- l ·, active power is negative Pk-l ·, reactive power is negative Qk-l ·, then let the system run time is short circuit capacity:

Figure CN104779644BD00051

[0012] 电网稳定性评估,令0SCR为k时刻风电场运行短路容量比,η为风电场内机组数,Pd 为单台风力发电机组额定容量,则有: [0012] Stability Assessment grid, so that for the moment k 0SCR wind farm operation circuit capacity ratio, [eta] is the number of units of wind power field, Pd single rated capacity of wind power generators, there are:

[0013] [0013]

Figure CN104779644BD00052

[0014] Pt = nXPd [0014] Pt = nXPd

[0015] 当3彡0SCR>m时,调整自动无功补偿设备的控制参数,当m彡0SCR>n2时,调整全功率变流器的控制参数,当n 2多0SCR时,减少同时并网机组的台数,所述m取值在2-3之间, Π 2取值参考ffiEE Std 1204-1997标准。 [0015] When 3 San 0SCR> m, automatically adjust the control parameters of reactive power compensation device, when m San 0SCR> when n2, the control parameter adjustment full power converter, when n 2 Multi 0SCR, simultaneously reduced grid number of units, the m value between 2-3, Π 2 ffiEE Std 1204-1997 standard reference value.

[0016] 作为本发明的一种改进,所述 [0016] An improvement of the present invention as the

Figure CN104779644BD00053

中Rk=0。 In Rk = 0.

[0017] 所述采集由风电场二次系统继电保护装置完成。 [0017] By means of the protection collecting wind farm secondary system.

[0018] 所述存储由数据中心完成。 [0018] By storing the data center.

[0019] 所述采集的数据通过以太网方式传输至存储设备。 [0019] The data collected is transmitted to the storage device via Ethernet.

[0020] 采用这样的设计后,本发明至少具有以下优点: [0020] With such a design, the present invention has at least the following advantages:

[0021] 本发明利用风电场在线运行数据求出风电场中主变低压侧的系统运行短路容量, 并利用该系统运行短路容量求出运行短路容量比,用于判断风电场并网稳定性,并以此作为风机全功率变流器和自动无功补偿设备控制参数修改的依据。 [0021] The present invention takes advantage of the wind farm operation data obtained online system short-circuit capacity of the wind farm main transformer low voltage side, and the use of short-circuit capacity of the system short-circuit capacity calculated ratio, for determining the stability of the wind farm grid, and as modified as full power turbine and the automatic reactive power compensation device based on control parameters. 利用本发明可以及时发现电网的运行状态,有利于及时采取相关措施减小损失。 The invention can detect the operating state of the power grid, it is conducive to take timely measures to reduce losses.

附图说明 BRIEF DESCRIPTION

[0022] 上述仅是本发明技术方案的概述,为了能够更清楚了解本发明的技术手段,以下结合附图与具体实施方式对本发明作进一步的详细说明。 [0022] The foregoing is merely an overview of the technical solution of the present invention, in order to more fully understood from the present invention, the following drawings in conjunction with the specific embodiments of the present invention will be further described in detail.

[0023] 图1是本发明一种风电场并网稳定性评估方法的计算流程图。 [0023] FIG. 1 is a flowchart illustrating calculation invention A wind farm grid stability assessment method.

[0024]图2是本发明短路容量计算等效电路图。 [0024] FIG. 2 is a short-circuit capacity calculated equivalent circuit diagram of the present invention.

具体实施方式 Detailed ways

[0025] 请参阅图1所示,本发明提出一种风电场并网稳定性评估方法,利用在线运行数据求出风电场中主变低压侧的系统运行短路容量,并利用该系统运行短路容量求出系统运行短路容量比用于判断风电场并网稳定性,并以此作为全功率变流器和自动无功补偿设备控制参数修改的依据。 [0025] Please refer to FIG. 1, the present invention proposes A wind farm grid stability assessment method, using the operating data obtained online system short-circuit capacity of the wind farm main transformer low voltage side, and using the system short-circuit capacity the system short-circuit capacity than is obtained for determining the stability of wind farms, and as a basis for full power and the reactive power compensation device to automatically modify the control parameters. 本发明主要针对风电场,风电场内包括断路器、集电线路、箱变、主变、 采用全功率变流器并网的风力发电机组、自动无功补偿设备SVC/SVG等。 The present invention is primarily directed wind farm, the wind farm includes a circuit breaker, a current collector line, box changes, the main transformer, full use of wind turbine power converter and the network, the automatic reactive power compensation device SVC / SVG and the like.

[0026] 1、数据采集与存储 [0026] 1, data acquisition and storage

[0027]具体来说,电网数据的采集与存储,是对风电场主变低压侧的实时瞬态电网数据进行采集并存储。 [0027] Specifically, the data collection and storage grid, grid data is real-time transient wind farm main transformer low pressure side is collected and stored. 具体是将风电场二次系统继电保护装置采集的主变低压侧母线电压、主变低压侧有功功率和无功功率通过以太网方式利用IEC61850通信规约传输至数据中心进行存储。 In particular the master device is acquired secondary system protection wind farm transformer low voltage side of the bus, the main low-pressure side becomes active and reactive power to the data storage center for transmission using a communication protocol IEC61850 via Ethernet.

[0028] 2、计算短路容量 [0028] 2, short-circuit capacity calculated

[0029] 请参阅图2所示,系统的等效电势为E = Ex+jEy;系统的等效阻抗为Z = R+jX;风电场主变低压侧的电压幅值为V;风电场主变低压侧的有功功率的负为P;风电场主变低压侧的无功功率的负为Q;系统运行的短路容量为S〇s。 [0029] Please refer to FIG. 2, the equivalent system for the potential E = Ex + jEy; system equivalent impedance is Z = R + jX; wind farm main transformer voltage amplitude of the low-pressure side is V; wind farm main change the low pressure side of the active power P is negative; negative reactive power of the wind farm main transformer low voltage side is Q; operating system short-circuit capacity is S〇s. .

[0030] 2.1、在k时刻: [0030] 2.1, at time k:

[0031] 系统的等效电势为Ek = Ekx+jEky;系统的等效阻抗为Zk = Rk+jXk;风电场主变低压侧的电压幅值为Vk;风电场主变低压侧的有功功率的负为Pk;风电场主变低压侧的无功功率的负为Qk;系统运行的短路容量为Skosc。 [0031] The system is equivalent to the potential Ek = Ekx + jEky; equivalent system impedance Zk = Rk + jXk; wind farm main transformer voltage amplitude of the low-pressure side is Vk is; wind farm main transformer low voltage side of the active It is Pk of negative; negative low voltage side of the main transformer windfarm reactive power is Qk; operating system short-circuit capacity is Skosc.

Figure CN104779644BD00061

[0036] 2.2、在1^-1时刻: [0036] 2.2, 1 -1 in time:

[0037] 系统的等效电势为Eh = E (kD x+jE (kD y,系统的等效阻抗为Zk-i = Rk-d jXk-i,风电场主变低压侧的电流电压幅值为Vh,有功功率的负为Ph,无功功率的负为Qh,得到 [0037] The system is equivalent to the potential Eh = E (kD x + jE (equivalent impedance kD y, the system for Zk-i = Rk-d jXk-i, the wind farm main transformer current voltage amplitude of the low-pressure side is Vh, active power is negative Ph, reactive power is negative Qh, to give

Figure CN104779644BD00071

Figure CN104779644BD00081

[0055] k时刻系统运行短路容量为: [0055] k time system short-circuit capacity is:

Figure CN104779644BD00082

通常高压不计Rk,则有: Typically high pressure excluding Rk, there are:

Figure CN104779644BD00083

[0056] 3、电网稳定性评估 [0056] 3, the grid stability assessment

[0057] 令0SCR为k时刻风电场运行短路容量比,η为风电场内机组数,Pd为单台风力发电机组额定容量,则有: [0057] k is the moment order 0SCR wind farm operation circuit capacity ratio, [eta] is the number of units of wind power field, Pd single rated capacity of wind power generators, there are:

[0058] [0058]

Figure CN104779644BD00084

(3-1) (3-1)

[0059] Pt = nXPd (3-2) [0059] Pt = nXPd (3-2)

[0060] 根据IEEE Std 1204-1997标准,当0SCR彡3为强电网;当3>0SCR>2为弱电网;当0SCR彡2为堪弱电网。 [0060] The IEEE Std 1204-1997 standards, when a strong power 0SCR San 3; when 3> 0SCR> 2 weak grid; 2 when 0SCR San worthy weak grids.

[0061] 因此当3多0SCR>m时输出蓝色预警,此时需注意SVC或SVG自动无功补偿设备控制参数与电网运行参数匹配性问题,及时调整设备控制参数;im$〇SCR>n2时输出橙色预警,此时需注意风机全功率变流器控制参数与电网参数匹配性问题,及时调整设备控制参数;当n 2>0SCR时输出红色预警,此时已经不利于风电场并网运行,建议减少同时并网机组的台数。 [0061] Thus, when more than three 0SCR> Output blue warning m, the time to note the SVC or SVG automatic reactive power control parameters and operating parameters matching problem compensation device, the control parameter adjustments in a timely manner; IM $ 〇SCR> n2 orange warning output, time to note the fan full power grid parameters and the control parameters matching problems, timely adjustment of the device control parameters; red alert output when n 2> 0SCR, this time has been unfavorable wind farms run , and at the same time proposed to reduce the number of network units.

[0062] 所述m取值在2-3之间,Π 2取值参考IEEE Std 1204-1997标准。 [0062] The m value between 2-3, Π 2 value of the reference standard IEEE Std 1204-1997. 在本实施例中,风电场主变低压侧电压取35kV,依据工程经验m优选为2.5,参考IEEE Std 1204-1997标准Π 2为2〇 In the present embodiment, the low-pressure side of the wind farm main transformer voltage 35kV take, based on engineering experience preferably 2.5 m, with reference to the standard IEEE Std 1204-1997 Π 2 is 2〇

[0063] 0SCR小的电网易发生电网振荡、动态过压、谐振等问题,这些电网故障状态都将影响风机的正常运行,并且损坏风电场内一次、二次设备,利用本发明可以及时发现电网运行状态,并及时米取相关措施减小损失。 [0063] 0SCR YORK small electric power swing occurs, the dynamic overpressure, resonance and so on, the grid fault condition which will affect the normal operation of the fan, and damage to the wind farm primary and secondary equipment, the use of the present invention can detect the grid running and timely meters take measures to reduce losses.

[0064]以上所述,仅是本发明的较佳实施例而已,并非对本发明作任何形式上的限制,本领域技术人员利用上述揭示的技术内容做出些许简单修改、等同变化或修饰,均落在本发明的保护范围内。 [0064] The above are only preferred embodiments of the present invention only, not limitation of the present invention in any form, those skilled in the technical contents disclosed by the above made simple slight modifications, equivalent variations or modifications, are fall within the scope of the present invention.

Claims (5)

1. 一种风电场并网稳定性评估方法,其特征在于包括以下步骤: 数据采集与存储,采集主变低压侧的母线电压、有功功率和无功功率并存储; 计算短路容量, 设定在k时刻,系统的等效电势为Ek=Ekx+jEky,等效阻抗为Zk=Rk+jXk,风电场主变低压侧的电压幅值为Vk,有功功率幅值为Pk,无功功率幅值为Qk,系统运行的短路容量为Sk_, 设定在k-1时刻,系统的等效电势为Eh = E (kD x+jE (kD y,系统的等效阻抗为Zh = Rk-d jXk-i,风电场主变低压侧的电压幅值为Vh,有功功率幅值为Ph,无功功率幅值为Qh, 贝ijk时刻系统运行短路容量为: 1. A wind farm grid stability evaluation method, comprising the steps: data acquisition and storage, acquisition becomes the main bus voltage low voltage side, and the active and reactive power storage; calculating short-circuit capacity set at equivalent potential time k, the system is Ek = ekx + jEky, the equivalent impedance Zk = Rk + jXk, wind farm main transformer low voltage side of the voltage amplitude Vk is, active power Pk of amplitude, the amplitude of the reactive power Qk is, the short-circuit capacity of the system operation is SK_, equivalent potential set time k-1, the system is Eh = E (kD x + jE (equivalent impedance kD y, the system of Zh = Rk-d jXk- i, the voltage amplitude of the low-pressure side of the wind farm main transformer is Vh, the magnitude of the active power Ph, the amplitude of the reactive power Qh, shellfish ijk timing system short-circuit capacity is:
Figure CN104779644BC00021
电网稳定性评估,令OSCR为k时刻风电场运行短路容量比,η为风电场内机组数,Pd为单台风力发电机组额定容量,则有: Stability assessment grid, so OSCR run time for the k-circuit capacity than wind farms, η is the number of units of wind electric field, Pd single wind turbines rated capacity, there are:
Figure CN104779644BC00022
Pt = nXPd 当3多OSCR>ndt,调整自动无功补偿设备的控制参数,当m多OSCR>n2时,调整全功率变流器的控制参数,当m^OSCR时,减少同时并网机组的台数,所述m取值在2-3之间,112取值为2。 Pt = nXPd when more than three OSCR> ndt, automatically adjusts the control parameters reactive power compensation device, when m multi OSCR> n2, the adjustment of the control parameters full power converter, when m ^ OSCR, while reducing grid units the number, the m value between 2-3, a value of 2 112.
2. 根据权利要求1所述的一种风电场并网稳定性评估方法,其特征在于所述 2. A wind farm according to claim 1 and grid stability assessment method, characterized in that said
Figure CN104779644BC00031
3. 根据权利要求1所述的一种风电场并网稳定性评估方法,其特征在于所述采集由风电场二次系统继电保护装置完成。 A wind farm according to claim 1 and grid stability assessment method, characterized in that said acquisition is done by the secondary system of the wind farm protection devices.
4. 根据权利要求1所述的一种风电场并网稳定性评估方法,其特征在于所述存储由数据中心完成。 A wind farm according to claim 1, wherein said grid stability assessment method, wherein said storing is completed by the data center.
5. 根据权利要求1所述的一种风电场并网稳定性评估方法,其特征在于所述采集的数据通过以太网方式传输至存储设备。 A wind farm according to claim 1 and grid stability assessment method, wherein the collected data transmitted to the storage device via Ethernet.
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