CN110970900A - 一种光热机组调相运行提高电压稳定性评价指标计算方法 - Google Patents
一种光热机组调相运行提高电压稳定性评价指标计算方法 Download PDFInfo
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Abstract
本发明公开了一种光热机组调相运行提高电压稳定性评价指标计算方法,若区域电网电压失稳,依次计算区域电网内光热集热系统中光热机组的指标ITSj;按照指标ITSj从大到小顺序依次将光热机组转调相运行;直到电压恢复稳定或所有光热机组全部调相运行为止。本发明提供的一种光热机组调相运行提高电压稳定性评价指标计算方法,可用于指导光热机组群在转调相运行的优先级确定,有助于提高电网电压稳定水平。
Description
技术领域
本发明涉及一种光热机组调相运行提高电压稳定性评价指标计算方法,属于电力系统及其自动化技术领域。
背景技术
光伏发电和风力发电是清洁能源领域中技术成熟、具备规模开发的发电方式,但风电和光电存在出力不稳定和间歇性等特点,新能源发电单元脱网事故时有发生,使得接入电网的安全运行问题突出。与光伏、风力发电相比,光热发电最大的优势是并网友好、储热连续、发电稳定,具有担当基荷电力的条件。太阳能热发电通过产生热水蒸汽带动汽轮机发电,与传统的火力发电方式相同,可以和光伏发电、风力发电、水电、抽水蓄能等多种电源配合,不会对电网产生不利影响,同时还能提供无功功率,具有优良的并网友好性,同时光热发电可以实现长时间稳定连续发电。
由于光热机组的发电能力不仅受光照条件约束,还具备一般同步机的运行特性。在光照强度不足时,为了保障储热系统连续供电能力,可适当降低光热机组有功出力,同时为了充分利用机组容量,可通过调整励磁电流,转调相运行,调整无功功率输出,提高近区电压稳定性。但如果大部分光热机组都转调相运行,则光热机组整体有功出力大幅下降,造成弃光,影响新能源消纳。
为了合理评价某台光热机组是否适宜转调相运行以及在转调相运行中对电压的支撑效果,本发明提出一种光热机组调相运行提高电压稳定性评价指标计算方法。通过该评价指标,可充分计及光热机组光照情况,有功储备情况,时域响应中的动态无功支撑及对电压中枢点的电气距离等一系列因素,综合评价光热转调相运行对系统电压稳定性的效果。
发明内容
目的:为了克服目前电网中光热机组投产逐渐增多,光热机组近区往往已经配套建设大量光伏电站,由于光伏电站出力间歇性、波动性的特点,同时无功补偿薄弱,容易造成电压大幅波动,在电网扰动及故障下容易造成电压失稳的不足。光热机组具备一般同步机的运行特性,在光照强度不足时,可适当降低光热机组有功出力,同时可通过调整励磁电流,转调相运行,调整无功功率输出,提高近区电压稳定性。为了评价光热机组转调相运行对电压稳定性的支撑效果,本发明提供一种光热机组调相运行提高电压稳定性评价指标计算方法。
技术方案:为解决上述技术问题,本发明采用的技术方案为:
一种光热机组调相运行提高电压稳定性评价指标计算方法,包括如下步骤:
若区域电网电压失稳,依次计算区域电网内光热集热系统中光热机组的指标ITSj;
按照指标ITSj从大到小顺序依次将光热机组转调相运行;
直到电压恢复稳定或所有光热机组全部调相运行为止。
一种光热机组调相运行提高电压稳定性评价指标计算装置,包括如下模块:
指标计算模块:若区域电网电压失稳,依次计算区域电网内光热集热系统中光热机组的指标ITSj;
转调相模块:按照指标ITSj从大到小顺序依次将光热机组转调相运行;直到电压恢复稳定或所有光热机组全部调相运行为止。
作为优选方案,所述指标ITSj计算公式如下:
其中:Bi为第i个电压观测点,n为区域电网内电压检测点总数量,wk为第k个时刻的权重,N为电压失稳到电压稳定的总时刻数,ΔQj为光热机组Gj转调相运行前后发出的无功功率变化量,ΔUi为电压检测点Bi电压变化量,po为光热集热系统o制约因素,WBi第i个电压观测点的权重。
作为优选方案,所述po计算公式如下:
其中:Pco.solar为光热集热系统o收到的太阳能功率,PNo.solar为光热集热系统o设计额定最大接受的太阳能功率。
作为优选方案,所述k时刻处于故障期间,wk>1。
作为优选方案,所述WBi计算公式如下:
其中:Sij为母线Bi与光热机组Gj的电气距离,Sj(min)为母线Bi与光热机组Gj的最小电气距离。
有益效果:本发明提供的一种光热机组调相运行提高电压稳定性评价指标计算方法,通过利用电网中不断投产的光热机组可提供动态无功补偿的特点,考虑光热自身的光照条件,计算光热机组发出无功对于近区电压提升的灵敏度,采用一定的权重算法,计及权重加权求和,得到光热机组调相运行提高电压稳定性评价指标。本发明可用于指导光热机组群在转调相运行的优先级确定,有助于提高电网电压稳定水平。
附图说明
图1为本发明方法的流程示意图。
具体实施方式
下面结合附图对本发明作更进一步的说明。
如图1所示,一种光热机组调相运行提高电压稳定性评价指标计算方法,包括以下内容:
1)假设某区域内有m台光热机组,第j台光热机组称为Gj。对Gj转调相运行对提高电压稳定性进行评价。设研究区域内有n个电压检测点,第i个电压观测点为Bi,根据电力系统运行方式及相应的模型与参数,采用时域仿真方法获取预想故障下光热机组Gj转调相运行前后发出的无功功率变化量ΔQj及研究区域内电压检测点Bi电压变化量ΔUi。
4)认为光热集热系统收到的太阳能功率在时域仿真的时间尺度上保持不变,令当前光照强度下光热集热系统o收到的太阳能功率为Pco.solar,光热集热系统o设计额定最大接受的太阳能功率为PNo.solar。考虑光热集热系统o在调相运行时光照强度的制约因素,其系数为
6)若在某预想故障的时域仿真中造成含光热机组的区域电网电压失稳,则依次计算区域电网内具备调相运行条件的光热机组ITSj,按照ITSj从大到小顺序依次将光热机组转调相运行并重新进行时域仿真,直到电压恢复稳定或所有光热机组全部调相运行为止。
所述步骤2)考虑一定的权重wk。权重wk的大小与该时刻k是否处于故障期间有关,若k时刻处于故障期间,wk>1,否则,wk=1。
以上所述仅是本发明的优选实施方式,应当指出:对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。
Claims (10)
1.一种光热机组调相运行提高电压稳定性评价指标计算方法,其特征在于:包括如下步骤:
若区域电网电压失稳,依次计算区域电网内光热集热系统中光热机组的指标ITSj;
按照指标ITSj从大到小顺序依次将光热机组转调相运行;
直到电压恢复稳定或所有光热机组全部调相运行为止。
4.根据权利要求2所述的一种光热机组调相运行提高电压稳定性评价指标计算方法,其特征在于:所述k时刻处于故障期间,wk>1。
6.一种光热机组调相运行提高电压稳定性评价指标计算装置,其特征在于:包括如下模块:
指标计算模块:若区域电网电压失稳,依次计算区域电网内光热集热系统中光热机组的指标ITSj;
转调相模块:按照指标ITSj从大到小顺序依次将光热机组转调相运行;直到电压恢复稳定或所有光热机组全部调相运行为止。
9.根据权利要求6所述的一种光热机组调相运行提高电压稳定性评价指标计算模块,其特征在于:所述k时刻处于故障期间,wk>1。
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