CN112366759A - 一种火电机组储能调频方法及系统 - Google Patents
一种火电机组储能调频方法及系统 Download PDFInfo
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Abstract
本发明提供了一种火电机组储能调频方法及系统,所述方法包括以下步骤:火电机组接收到AGC指令后,按照给定的功率运行,输出功率到电网系统和厂用负荷;储能控制器接收到AGC指令信号和DCS发送的机组出力信号,计算出储能系统ESS需要输出的功率;本地处理器接收测控装置的实时电压电流,计算出功率值,进一步计算厂用变压器能够承受的最大可充可放功率;储能控制器接收本地处理器的最大可充可放值,与计算出的需要输出的功率值进行比较,充电时取最小可充值为储能待设定值,放电时取最小可放值为储能待设定值;储能控制器将计算的待设定值发送给储能系统ESS的PCS,PCS根据指令执行充放电。
Description
技术领域
本发明涉及火力发电技术领域,尤其涉及一种火电机组储能调频方法及系统。
背景技术
调频辅助服务是维护电网稳定运行的一项重要手段,当前大多数电网中,大型火电和水电为主要调频电源,AGC通过不断调节机组出力来响应区域调节需求。随着新能源并网比例的不断增加,电网对调频资源的品质提出了更高的要求,火电和水电机组均为旋转机械器件,受机械惯性和旋转摩擦的影响,制约着电网安全和电能品质的进一步提升。
储能作为可灵活调节的优质电力存储资源,在联合火力发电厂参与电力市场辅助调频时,可有效弥补火电机组因转动惯性导致调频响应速度慢、调节精度差的不足。近几年,储能联合火电调频引起了业界广泛的关注,研究表明,相较于传统的火电调频,储能系统在电网调频方面具有显著的效果。
但是储能参与火电联合调频时,需要对现有电厂的通讯系统进行改造,并且重新设计一套储能控制系统,以满足储能协调运行和电网调度机构的要求。目前,储能调频控制系统接入火电时,需要进行以下改进:1)远程终端单元(RTU)改造,一方面需要将调度机构下达的AGC指令转发给储能控制系统,另一方面需要将机组出力和储能出力信号合并后上传给调度;2)分散控制系统(DCS)改造,新增DCS与储能控制系统的通讯,DCS将机组调频机组出力反馈、投入反馈、动作标志发送给储能控制系统,储能控制系统则将储能系统并网连接状态反馈;储能系统并网功率;储能系统辅助调峰投入反馈;储能系统充放电状态等发送给DCS。
发明内容
本发明第一方面提供了一种火电机组储能调频方法,包括以下步骤:
S1:火电机组接收到AGC指令后,按照给定的功率运行,输出功率到电网系统和厂用负荷;
S2:储能控制器接收到AGC指令信号和DCS发送的机组出力信号,计算出储能系统ESS需要输出的功率;
S3:本地处理器接收测控装置的实时电压电流,计算出功率值,进一步计算厂用变压器能够承受的最大可充可放功率;
S4:储能控制器接收本地处理器的最大可充可放值,与计算出的需要输出的功率值进行比较,充电时取最小可充值为储能待设定值,放电时取最小可放值为储能待设定值;
S5:储能控制器将步骤S4中计算的待设定值发送给储能系统ESS的PCS,PCS根据指令执行充放电。
其中,设定储能控制器接收的AGC指令为Pagc,DCS发送来的机组出力值为Pm,则储能系统ESS需要输出的功率为Pess=|Pagc-Pm|;若Pagc-Pm<0,则储能系统ESS需要充电;若Pagc-Pm>0,则储能系统ESS需要放电。
其中,计算厂用变压器所能承受的最大可充功率,包括:设定测控装置监测的厂用变压器高压侧功率为P1,储能接入低压侧功率为P2,储能接入并网点功率为P3,设定变压器高压侧容量为PHmax,低压侧容量为PLmax,储能控制器设置过载和倒送死区为Pallow;
储能系统充电时:
储能接入侧厂用电功率Pload2 = P2 - P3;
厂用电总功率Pload1 = P1 - P3;
低压侧最大可充电功率Pchg1 = |PLmax - Pload2 - Pallow|;
高压侧最大可充电功率Pchg2 = |PHmax - Pload1 - Pallow|;
计算出厂用变压器所能承受的最大可充功率Pchgmax = Max(Pchg1,Pchg2)。
其中,充电时,储能控制器下发给储能系统ESS的设置功率为待设置功率与最大可充功率的最小值,Pset = Min(Pess,Pchgmax)。
其中,计算厂用变压器所能承受的最大可放功率,包括:设定测控装置监测的厂用变压器高压侧功率为P1,储能接入低压侧功率为P2,储能接入并网点功率为P3,设定变压器高压侧容量为PHmax,低压侧容量为PLmax,储能控制器设置过载和倒送死区为Pallow;
储能系统充电时:
储能接入侧厂用电功率Pload2 = P2 - P3;
厂用电总功率Pload1 = P1 - P3;
低压侧最大可充电功率Pdischg1 = |Pload2 - Pallow|;
高压侧最大可充电功率Pdischg2 = |Pload1 - Pallow|;
计算出厂用变压器所能承受的最大可放功率Pdischgmax = Max(Pdischg1,Pdischg2)。
其中,放电时,储能控制器下发给储能系统ESS的设置功率为待设置功率与最大可放功率的最小值,Pset=min(Pess,Pdischgmax)。
本发明第二方面还提供了一种用于本发明第一方面提供的储能调频方法的储能调频系统,所述调频系统包括升压变压器、电网系统、厂用变压器和厂用负荷,所述升压变压器和所述厂用变压器分别与所述火电机组连接;所述升压变压器与所述电网系统连接,所述厂用变压器低压侧出线一端与所述厂用负荷连接;所述厂用变压器低压侧出线一端还连接有储能系统ESS。
其中,所述调频系统还包括AGC、DCS、本地处理器和储能控制器,所述AGC将信号传给所述DCS和所述储能控制器,所述本地处理器通过光纤线缆与所述储能控制器通讯,所述储能控制器将控制指令发送给所述储能系统ESS;
所述调频系统还包括第一测控装置、第二测控装置和第三测控装置,所述第一测控装置上的第一PT/CT传感器安装于所述厂用变压器高压侧进线电缆上,所述第二测控装置上的第二PT/CT传感器安装于所述厂用变压器低压侧出线电缆上,所述第三测控装置上的第三PT/CT传感器安装于所述储能系统ESS进线电缆上;所述第一测控装置、所述第二测控装置和所述第三测控装置均接入所述本地处理器的通讯接口。
其中,所述本地处理器与所述第一测控装置、所述第二测控装置和所述第三测控装置通讯规约支持Modbus RTU或DL645,所述本地处理器与所述储能控制器通讯规约支持Modbus TCP或IEC104;
所述AGC信号和所述DCS信号传入所述储能控制器的方式为硬接线,经过D/A、A/D转换;
所述储能控制器控制所述储能系统ESS充放电的执行机构为储能变流器,所述储能控制器与所述储能变流器采用光纤通信,IEC104协议;
所述本地处理器是具备高速通信和处理能力的微处理器。
其中,所述储能系统ESS是电化学储能、飞轮储能或电容储能中的任意一种;所述电化学储能是锂离子电池、液流电池或钠硫电池中的任意一种。
本发明的有益效果:
1、可以提高火电机组响应AGC的速度和精度,有助于提高AGC调频综合性能和调节深度;
2、可以避免储能系统充放电过程中对接入电厂的高厂变造成过载或逆流,改变电厂潮流,影响电厂的安全运行。
附图说明
为了更清楚地说明本发明的技术方案,下面将对实施方式中需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施方式,对应本领域的普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。
图1是本发明实施例提供的储能调频方法所采用的储能调频系统的结构示意图;
图2是本发明实施例提供的储能调频方法中本地处理器的控制流程图;
图3是本发明实施例提供的储能调频方法中储能控制器的控制流程图;
附图中附图标记所对应的名称为:1-火电机组,101-AGC,102-DCS,103-本地处理器,104-和储能控制器,2-升压变压器,201-第一测控装置,202-第二测控装置,203-第三测控装置,3-电网系统,4-厂用变压器,5-厂用负荷,6-储能系统ESS,11-第一PT/CT传感器,12-第二PT/CT传感器,13-第三PT/CT传感器。
具体实施方式
以下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,这些改进和润饰也视为本发明的保护范围。
本发明提供了一种火电机组储能调频方法,所采用的储能调频系统如图1所示,所述调频系统包括升压变压器2、电网系统3、厂用变压器4和厂用负荷5,所述升压变压器2和所述厂用变压器4分别与所述火电机组1连接;所述升压变压器2与所述电网系统3连接,所述厂用变压器4低压侧出线一端与所述厂用负荷5连接,所述厂用变压器4低压侧出线一端还连接有储能系统ESS 6。
所述调频系统还包括AGC 101、DCS(分散控制系统)102、本地处理器103和储能控制器104,所述AGC 101将信号传给所述DCS 102和所述储能控制器104,所述火电机组1根据DCS控制输入电功率,功率流入所述升压变压器2和所述厂用变压器4;所述本地处理器103通过光纤线缆与所述储能控制器104通讯,所述储能控制器104将控制指令发送给所述储能系统ESS 6。所述调频系统还包括第一测控装置201、第二测控装置202和第三测控装置203,所述第一测控装置201上的第一PT/CT传感器11安装于所述厂用变压器4高压侧进线电缆上,所述第二测控装置202上的第二PT/CT传感器12安装于所述厂用变压器4低压侧出线电缆上,所述第三测控装置203上的第三PT/CT传感器13安装于所述储能系统ESS 6进线电缆上;所述第一PT/CT传感器11、所述第二PT/CT传感器12和所述第三PT/CT传感器13分别将检测到的电压电流信号接入所述第一测控装置201、所述第二测控装置202和所述第三测控装置203;所述第一测控装置201、所述第二测控装置202和所述第三测控装置203经RS485通讯线接入所述本地处理器103的通讯接口;所述储能控制器104接收AGC101和DCS102和微处理器信号,所述储能控制器104经过综合计算后发送控制指令给储能系统ESS 6,充电时储能系统ESS 6从厂用变压器4低压侧吸收功率,如果充电功率过大,会导致变压器过载;放电时储能系统ESS 6发送功率给厂用负荷5,如果放电功率过大,会导致功率向变厂用压器4上端上送。
所述本地处理器103与所述第一测控装置201、所述第二测控装置202和所述第三测控装置203通讯规约支持Modbus RTU或DL645,所述本地处理器103与所述储能控制器104通讯规约支持Modbus TCP或IEC104;所述AGC 101)信号和所述DCS 102信号传入所述储能控制器104的方式为硬接线,经过D/A、A/D转换;所述储能控制器104控制所述储能系统ESS6充放电的执行机构为储能变流器,所述储能控制器104与所述储能变流器采用光纤通信,IEC104协议。
在本发明实施例中,储能系统ESS 6是电化学储能、飞轮储能或电容储能中的任意一种,所述电化学储能是锂离子电池、液流电池或钠硫电池中的任意一种,所述本地处理器103是具备高速通信和处理能力的微处理器。
本发明提供的储能调频方法具体包括:
第一步,如图2所示,为本地处理器103的程序流程,用于预处理第一测控装置201、第二测控装置202和第三测控装置203的采样功率,首先定义三个功率的变量名为P201、P202、P203。
当火电机组1运行后,便会有功率流向厂用变压器4,其电压电流被厂用变压器4高压侧的第一PT/CT装置11检测到,然后被第一测控装置201转换为功率P201;厂用变压器4低压侧的第二PT/CT装置12检测到的电压电流,被第二测控装置202转换为功率P202;储能接入点的第三PT/CT装置13检测到的电压电流,被第三测控装置203转换为功率P203。
本地处理器103实时读取三个测控装置的功率值,设定厂用变压器4高压侧容量为PHmax,低压侧容量为PLmax,储能控制器104设置过载和防倒送死区为Pallow。
计算厂用变压器4所能允许的最大可充功率,计算过程如下:
储能接入侧厂用电功率Pload2 = P2 - P3;
厂用电总功率Pload1 = P1 - P3;
为了保证低压侧不过载,低压侧最大可充电功率Pchg1 = |PLmax - Pload2 - Pallow|;
为了保证高压侧不过载,高压侧最大可充电功率Pchg2 = |PHmax - Pload1 - Pallow|;
计算出厂用变压器4所能承受的最大可充功率Pchgmax = Max(Pchg1,Pchg2);
计算厂用变压器4所能允许的最大可放功率,计算过程如下:
储能接入侧厂用电功率Pload2 = P2 - P3;
厂用电总功率Pload1 = P1 - P3;
为了保证低压侧不倒送,低压侧最大可充电功率Pdischg1 = |Pload2 - Pallow|;
为了保证低压侧不倒送,高压侧最大可充电功率Pdischg2 = |Pload1 - Pallow|;
计算出变压器4所能承受的最大可放功率Pdischgmax = Max(Pdischg1,Pdischg2);
最后,将计算出来的最大可充电功率Pchgmax和最大可放功率Pdischgmax上传给储能控制器104。
第二步,如图3所示,为储能控制器104的控制流程:
(1)程序运行后,储能控制器104实时读取AGC101指令和DCS 102的机组出力,将以上值赋给变量Pagc和Pm;
(2)程序内部根据Pagc和Pm两个参数计算储能待设置功率Pess,计算公式为Pess=|Pagc-Pm|;
(3)读取第一步本地处理器计算输出的最大可充功率Pchgmax和和最大可放功率Pdischgmax;
(4)判断储能是需要充电还是放电,判断依据为:如果Pagc-Pm>0,则放电,如果Pagc-Pm<0,则充电,否则为待机;
(5)充电时,储能控制器104下发给储能系统ESS的设置功率为待设置功率与最大可充功率的最小值,Pset=min(Pess,Pchgmax);
(6)放电时,储能控制器104下发给储能系统ESS的设置功率为待设置功率与最大可放功率的最小值,Pset=min(Pess,Pdischgmax);
(7)下发储能设置功率Pset及充放电指令给储能系统ESS中的PCS设备。
以上实施例仅表达了本发明的具体实施方式,其描述较为具体和详细,但并不能因此而理解为对本发明专利范围的限制。应当指出的是,对于本领域的普通技术人员来说,在不脱离本发明构思的前提下,还可以做出若干变形和改进,这些都是属于本发明的保护范围。因此,本发明专利的保护范围应以所附权利要求为准。
Claims (10)
1.一种火电机组储能调频方法,其特征在于,包括以下步骤:
S1:火电机组接收到AGC指令后,按照给定的功率运行,输出功率到电网系统和厂用负荷;
S2:储能控制器接收到AGC指令信号和DCS发送的机组出力信号,计算出储能系统ESS需要输出的功率;
S3:本地处理器接收测控装置的实时电压电流,计算出功率值,进一步计算厂用变压器能够承受的最大可充可放功率;
S4:储能控制器接收本地处理器的最大可充可放值,与计算出的需要输出的功率值进行比较,充电时取最小可充值为储能待设定值,放电时取最小可放值为储能待设定值;
S5:储能控制器将步骤S4中计算的待设定值发送给储能系统ESS的PCS,PCS根据指令执行充放电。
2.根据权利要求1所述的一种火电机组储能调频方法,其特征在于:设定储能控制器接收的AGC指令为Pagc,DCS发送来的机组出力值为Pm,则储能系统ESS需要输出的功率为Pess=|Pagc-Pm|;若Pagc-Pm<0,则储能系统ESS需要充电;若Pagc-Pm>0,则储能系统ESS需要放电。
3.根据权利要求2所述的一种火电机组储能调频方法,其特征在于,计算厂用变压器所能承受的最大可充功率,包括:设定测控装置监测的厂用变压器高压侧功率为P1,储能接入低压侧功率为P2,储能接入并网点功率为P3,设定变压器高压侧容量为PHmax,低压侧容量为PLmax,储能控制器设置过载和倒送死区为Pallow;
储能系统充电时:
储能接入侧厂用电功率Pload2 = P2 - P3;
厂用电总功率Pload1 = P1 - P3;
低压侧最大可充电功率Pchg1 = |PLmax - Pload2 - Pallow|;
高压侧最大可充电功率Pchg2 = |PHmax - Pload1 - Pallow|;
计算出厂用变压器所能承受的最大可充功率Pchgmax = Max(Pchg1,Pchg2)。
4.根据权利要求3所述的一种火电机组储能调频方法,其特征在于:充电时,储能控制器下发给储能系统ESS的设置功率为待设置功率与最大可充功率的最小值,Pset = Min(Pess,Pchgmax)。
5.根据权利要求2所述的一种火电机组储能调频方法,其特征在于,计算厂用变压器所能承受的最大可放功率,包括:设定测控装置监测的厂用变压器高压侧功率为P1,储能接入低压侧功率为P2,储能接入并网点功率为P3,设定变压器高压侧容量为PHmax,低压侧容量为PLmax,储能控制器设置过载和倒送死区为Pallow;
储能系统充电时:
储能接入侧厂用电功率Pload2 = P2 - P3;
厂用电总功率Pload1 = P1 - P3;
低压侧最大可充电功率Pdischg1 = |Pload2 - Pallow|;
高压侧最大可充电功率Pdischg2 = |Pload1 - Pallow|;
计算出厂用变压器所能承受的最大可放功率Pdischgmax = Max(Pdischg1,Pdischg2)。
6.根据权利要求5所述的一种火电机组储能调频方法,其特征在于:放电时,储能控制器下发给储能系统ESS的设置功率为待设置功率与最大可放功率的最小值,Pset=min(Pess,Pdischgmax)。
7.一种用于权利要求1~6中储能调频方法的储能调频系统,其特征在于:所述调频系统包括升压变压器、电网系统、厂用变压器和厂用负荷,所述升压变压器和所述厂用变压器分别与所述火电机组连接;所述升压变压器与所述电网系统连接,所述厂用变压器低压侧出线一端与所述厂用负荷连接;所述厂用变压器低压侧出线一端还连接有储能系统ESS。
8.根据权利要求7所述的储能调频系统,其特征在于:
所述调频系统还包括AGC、DCS、本地处理器和储能控制器,所述AGC将信号传给所述DCS和所述储能控制器,所述本地处理器通过光纤线缆与所述储能控制器通讯,所述储能控制器将控制指令发送给所述储能系统ESS;
所述调频系统还包括第一测控装置、第二测控装置和第三测控装置,所述第一测控装置上的第一PT/CT传感器安装于所述厂用变压器高压侧进线电缆上,所述第二测控装置上的第二PT/CT传感器安装于所述厂用变压器低压侧出线电缆上,所述第三测控装置上的第三PT/CT传感器安装于所述储能系统ESS进线电缆上;所述第一测控装置、所述第二测控装置和所述第三测控装置均接入所述本地处理器的通讯接口。
9.根据权利要求8所述的储能调频系统,其特征在于:
所述本地处理器与所述第一测控装置、所述第二测控装置和所述第三测控装置通讯规约支持Modbus RTU或DL645,所述本地处理器与所述储能控制器通讯规约支持Modbus TCP或IEC104;
所述AGC信号和所述DCS信号传入所述储能控制器的方式为硬接线,经过D/A、A/D转换;
所述储能控制器控制所述储能系统ESS充放电的执行机构为储能变流器,所述储能控制器与所述储能变流器采用光纤通信,IEC104协议;
所述本地处理器是具备高速通信和处理能力的微处理器。
10.根据权利要求7所述的储能调频系统,其特征在于:所述储能系统ESS是电化学储能、飞轮储能或电容储能中的任意一种;所述电化学储能是锂离子电池、液流电池或钠硫电池中的任意一种。
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