WO2019062228A1 - 一种户用储能系统动态调节局部电网质量的系统及方法 - Google Patents

一种户用储能系统动态调节局部电网质量的系统及方法 Download PDF

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WO2019062228A1
WO2019062228A1 PCT/CN2018/092992 CN2018092992W WO2019062228A1 WO 2019062228 A1 WO2019062228 A1 WO 2019062228A1 CN 2018092992 W CN2018092992 W CN 2018092992W WO 2019062228 A1 WO2019062228 A1 WO 2019062228A1
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grid
management system
energy management
quality information
power
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PCT/CN2018/092992
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English (en)
French (fr)
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刘鲁健
林栋�
袁宏亮
王珺
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沃太能源南通有限公司
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy

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  • the invention relates to a method for upgrading an energy storage system, in particular to a system and method for dynamically adjusting the quality of a local power grid by a household energy storage system.
  • Frequency and voltage are the two major indicators of grid power quality.
  • the frequency remains unchanged.
  • the power is less than the active load, the frequency decreases.
  • the active load is greater than the active load, the frequency rises.
  • the work power is equal to the reactive load of the user, the voltage remains unchanged; when the power is less than the reactive load, the voltage drops, and the voltage rises when the load is greater than the reactive load. Since the load change is randomly changed, the frequency and voltage fluctuations of the power grid are caused.
  • the active power output of the generator is changed, and the reactive power can adjust the grid frequency and the grid voltage. Therefore, the power grid dispatcher must constantly issue frequency-modulation commands to the power plant to ensure that the frequency is within the qualified range, so that the power quality can only be adjusted in a macroscopic manner and cannot be adjusted too large. In extreme cases, if the frequency is too high, the load can be stopped. If the frequency is too low, the power can only be pulled out.
  • the present invention provides a system for dynamically adjusting the quality of a local power grid by a household energy storage system, which adopts an active or passive form to collect the current quality of the power grid, and performs a threshold preset by the energy management system.
  • the comparison analysis operation is performed to obtain the corresponding adjustment value, and the inverter output is adjusted in real time to ensure the reliability of the adjustment.
  • the invention discloses a system for dynamically adjusting the local grid quality of a household energy storage system, comprising an energy management system, an energy storage inverter and a radio network scheduling device, wherein the radio network scheduling device wirelessly acquires the real-time grid quality of the grid company
  • the information is sent to the energy management system, and the energy management system performs analysis and calculation according to the feedback power quality information combined with the preset standard threshold, obtains the grid frequency and voltage fluctuation range values, and passes the grid-connected inverter.
  • the active energy or the reactive energy is output to the grid for adjustment.
  • the utility model further comprises an electric meter and an energy management system and a grid-connected inverter, wherein the electric meter is connected to the grid to obtain current grid quality information, and the grid quality information is fed back to the energy management system, and the energy management system combines the preset information according to the feedback information.
  • the standard threshold is calculated and analyzed to obtain the grid frequency and voltage fluctuation range values, and the grid-connected inverter is used as an execution unit to output active energy or reactive energy to the grid for adjustment.
  • the grid quality information includes a grid voltage value and a grid frequency value.
  • a method for dynamically adjusting the quality of a local power grid by a household energy storage system which is characterized by the following contents:
  • the radio network scheduling device acquires the grid quality information of the grid company in real time by using a wireless form, and the grid quality information includes a grid voltage value and a grid frequency value;
  • the radio network scheduling device transmits the acquired power quality information to the energy management system in real time through the dry contact state, and the energy management system analyzes and calculates the received power quality information in combination with the internal preset standard threshold;
  • the energy management system calculates the active power drop adjustment value, and outputs the grid frequency to the grid through the grid-connected inverter. If the received grid frequency is higher than the threshold, the energy management system calculates the active power value to be consumed; obtains the grid quality information through the radio network scheduling device, and adjusts the grid quality according to the dry contact state look-up table output;
  • the energy management system calculates the reactive power drop adjustment value, and outputs the grid voltage to the grid through the grid-connected inverter.
  • the adjustment if the received grid voltage is higher than the threshold, the energy management system calculates the reactive power value to be consumed; obtains the grid quality information through the radio network scheduling device, and uses the reactive power algorithm to calculate the required consumption according to the dry contact state
  • the power output value is used to adjust the quality of the power grid;
  • the radio network scheduling device cannot obtain the current grid quality of the grid company, the current grid quality information is collected through the electricity meter, and the collected grid quality information includes the grid voltage value and the grid frequency value, and then the collected grid quality information is transmitted through the RS485 mode.
  • the energy management system To the energy management system;
  • the energy management system performs analysis and calculation according to the grid quality information fed back by the electric meter, and the internal preset standard threshold value. For specific analysis and calculation, refer to steps S3 and S4.
  • the method and method for dynamically adjusting the local power grid quality of a household energy storage system of the present invention have the following advantages:
  • the radio network dispatching device directly obtains the grid quality value collected by the grid company.
  • the data is directly provided by the grid company with high accuracy.
  • the active meter is used to measure the current grid quality. The collection ensures the sustainability of grid quality data collection and reduces the impact of external factors (the grid company has no data);
  • the form of comparative analysis and calculation is used to adjust the frequency and voltage of the local grid, so that the grid quality meets the current load and ensures the safe use of the grid.
  • FIG. 1 is a block diagram of a system for dynamically adjusting a local power grid quality of a household energy storage system according to the present invention
  • Figure 2 shows the power factor Cos (Phi) and P / Pn boundary condition diagram
  • Figure 3 is a graph showing the equations when P1 and P2 are in the same quadrant
  • Figure 4 shows the equations of the equations P1 and P2 in different quadrants.
  • a system for dynamically regulating local power grid quality of a household energy storage system includes an electricity meter, an energy management system, a grid-connected inverter, and a radio network scheduling device, wherein the energy management system
  • the grid-connected inverter and the radio network scheduling device form a passive dispatching system
  • the electric meter, the energy management system and the grid-connected inverter constitute an active dispatching system
  • the active dispatching system performs the scheduling operation when the passive dispatching system cannot be used.
  • the radio network scheduling device wirelessly acquires the real-time grid quality information of the grid company, and transmits the acquired grid quality information to the energy management system, and the energy management system combines the preset based on the feedback grid quality information.
  • the standard threshold is analyzed and calculated, and the grid frequency and voltage fluctuation range values are obtained, and the grid-connected inverter is used as an execution unit to output active energy or reactive energy to the grid for adjustment.
  • the electricity meter is connected to the power grid to obtain current power quality information, and the power quality information is fed back to the energy management system, and the energy management system performs operation analysis according to the feedback information and the preset standard threshold to obtain the grid frequency and voltage.
  • the fluctuation range value is adjusted by the grid-connected inverter as an execution unit to output active energy or reactive energy to the grid.
  • the grid quality information includes a grid voltage value and a grid frequency value.
  • the wireless dispatching device is a Ripple control receiver of the company xx, which has the function of wirelessly acquiring power grid information of the power grid company, and realizes electrical connection with the MCU in the energy management system through the six terminals thereof, and the six terminals are active power terminals respectively, Power power terminal, D_IN1 ⁇ D_IN4 terminal, wherein switch K1 ⁇ K4 is connected between D_IN1 ⁇ D_IN4 terminal and active power terminal, and switch K5 ⁇ K8 is connected with reactive power respectively, wireless dispatching device gives energy management
  • the active control signals of the system are from K1 to K4, and the reactive control signals are from K5 to K8, and logic 0 indicates ON, and logic 1 indicates closure. See Table 1 and Table 2 for the specific truth table.
  • the invention discloses a method for dynamically adjusting the quality of a local power grid by a household energy storage system, which comprises the following contents:
  • the radio network scheduling device acquires the grid quality information of the grid company in real time by using a wireless form, and the grid quality information includes a grid voltage value and a grid frequency value;
  • the radio network scheduling device transmits the acquired power quality information to the energy management system in real time through the dry contact state, and the energy management system analyzes and calculates the received power quality information in combination with the internal preset standard threshold;
  • the power quality information obtained by the electric meter first compares the received grid frequency. If the received grid frequency value is lower than the threshold, the energy management system calculates the active power drop adjustment value and outputs the output through the grid-connected inverter. To adjust the grid frequency to the grid, if the received grid frequency is higher than the threshold, the energy management system calculates the active power value to be consumed; obtains the grid quality information through the radio network dispatching device, and adjusts the grid according to the dry contact state checklist output quality
  • the grid quality information obtained by the electric meter compares the received grid voltage values. If the received grid voltage value is lower than the threshold, the energy management system calculates the reactive power drop adjustment value and passes the grid-connected inverter. Output to the grid for grid voltage adjustment. If the received grid voltage is higher than the threshold, the energy management system calculates the reactive power value to be consumed; obtains the grid quality information through the radio network scheduling device, and uses reactive power according to the dry contact state. The algorithm calculates the reactive power value output to be consumed to adjust the power quality of the power grid;
  • the radio network scheduling device cannot obtain the current grid quality of the grid company, the current grid quality information is collected through the electricity meter, and the collected grid quality information includes the grid voltage value and the grid frequency value, and then the collected grid quality information is transmitted through the RS485 mode.
  • the energy management system To the energy management system;
  • the energy management system performs analysis and calculation according to the grid quality information fed back by the electric meter, and the internal preset standard threshold value. For specific analysis and calculation, refer to steps S3 and S4.
  • the specific scheduling algorithm is as follows:
  • the EMS detects the D_IN1, D_IN2, D_IN3, and D_IN4 signals as X (X is 1, 2, 4, 8). As can be seen from Table 1, the active power can be obtained by looking up the table;
  • the EMS In order to achieve accurate reactive power regulation, the EMS needs to obtain the reactive power Q, so the reactive power Q needs to be added in the protocol.
  • the reactive power Q is obtained by variable Cos (Phi).
  • P represents real-time power
  • Pn is rated power, when P/Pn ⁇ 0.5, it means voltage lead current, P/Pn>0.5, voltage hysteresis current.
  • the equation is two piecewise straight lines: the third point P3 ((K1+K2)/2, 1) can be obtained by the speciality of the straight line: it can be calculated by a similar method. Two linear equations are used to find A and B, respectively. Get dynamic COS (Phi).
  • the EMS sends an instruction to the registered inverter when abs(cos(Phi2)-cos(Phi1))>e(e is the threshold). This avoids sending Cos(Phi) to the inverter every time.

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  • Supply And Distribution Of Alternating Current (AREA)

Abstract

本发明公开了一种户用储能系统动态调节局部电网质量的系统，包括能量管理系统，并网逆变器，无线电网调度装置，其中所述无线电网调度装置无线获取电网公司的实时电网质量信息，并将获取的电网质量信息发送至能量管理系统，能量管理系统根据反馈的电网质量信息结合预设的标准阈值进行分析运算，获得电网频率及电压波动范围值，并通过并网逆变器作为执行单元输出有功电能或无功电能至电网进行调节。

Description

一种户用储能系统动态调节局部电网质量的系统及方法 技术领域
本发明涉及储能系统升级方法，尤其涉及一种户用储能系统动态调节局部电网质量的系统及方法。
背景技术
频率、电压是电网电能质量的二大指标，当电网发出的有功功率等于用户有功负荷时，频率保持不变；小于有功负荷时，频率下降，大于有功负荷时，频率上升；当电网发出的无功功率等于用户的无功负荷时，电压保持不变；小于无功负荷时，电压下降，大于无功负荷时电压上升，由于负荷变化是随机变化的，所以造成了电网频率和电压的波动。
因此，改变发电机输出的有功功率，无功功率可以调整电网频率、电网电压。所以电网调度人员要不停地向发电厂下达调频命令以保证频率在合格范围，这样只能宏观大范围调节电网质量，不可调节过大。在极端情况下，频率过高可以减负荷停机，频率过低出力加足时只能拉路停电。
发明内容
为克服现有技术的缺陷，本发明提供了一种户用储能系统动态调节局部电网质量的系统，采用主动或被动形式对电网当前质量进行采集，并通过能量管理系统内部预设的阈值进行对比分析运算，进而获得对应的调节数值，由逆变器输出进行实时调节，确保了调节的可靠性。
本发明揭示了一种户用储能系统动态调节局部电网质量的系统，包括能量管理系统，储能逆变器，无线电网调度装置，其中所述无线电网调度装置无线获取电网公司的实时电网质量信息，并将获取的电网质量信息发送至能量管理系统，能量管理系统根据反馈的电网质量信息结合预设的标准阈值进行分析运算， 获得电网频率及电压波动范围值，并通过并网逆变器作为执行单元输出有功电能或无功电能至电网进行调节。
还包括电表与能量管理系统及并网逆变器组成主动式调节，其中电表连接电网获取当前电网质量信息，并将电网质量信息反馈至能量管理系统，能量管理系统根据反馈的信息结合预设的标准阈值进行运算分析，获得电网频率及电压波动范围值，并通过并网逆变器作为执行单元输出有功电能或无功电能至电网进行调节。
所述电网质量信息包括电网电压值和电网频率值。
一种户用储能系统动态调节局部电网质量的方法，其特征在于包括如下内容：
S1、无线电网调度装置采用无线形式实时获取电网公司的电网质量信息，该电网质量信息包括电网电压值和电网频率值；
S2、无线电网调度装置将获取的电网质量信息通过干接点状态实时传送给能量管理系统，能量管理系统将接收到的电网质量信息结合内部预设的标准阈值进行分析运算；
S3、首先将接收到的电网频率进行对比，若接收到的电网频率值低于阈值，则能量管理系统运算出有功功率下降调节值，并通过并网逆变器输出至电网进行电网频率的调整，若接收到的电网频率高于阈值，则能量管理系统运算出需消耗的有功功率值；通过无线电网调度装置获取电网质量信息，根据干接点状态查表输出调节电网质量；
S4、然后将接受到的电网电压值进行对比，若接收到的电网电压值低于阈值，则能量管理系统运算出无功功率下降调节值，并通过并网逆变器输出至电网进行电网电压的调整，若接收到的电网电压高于阈值，则能量管理系统运算 出需消耗的无功功率值；通过无线电网调度装置获取电网质量信息，根据干接点状态运用无功算法算出需消耗的无功功率值输出调节电网质量；
S5、重复上述步骤S1～S4直至到达预设标准阈值；
S6、若无线电网调度装置无法获取电网公司当前电网质量时，通过电表进行当前电网质量信息采集，采集的电网质量信息包括电网电压值和电网频率值，然后将采集的电网质量信息通过RS485方式传送至能量管理系统；
S7、能量管理系统根据电表反馈的电网质量信息，结合内部预设的标准阈值进行分析运算，具体分析运算参见步骤S3和S4。
与现有技术相比，本发明的一种户用储能系统动态调节局部电网质量的方法及方法，具有如下有益之处：
正常情况下采用无线电网调度装置直接获取电网公司内部采集的电网质量数值，该数据由电网公司直接提供准确度高，在电网公司数据无法传达的时候，采用主动式的电表对当前使用的电网质量进行采集，保证了电网质量数据采集的可持续性，减少了外部因素(电网公司无数据)的影响；
无论是主动还是被动形式，均采用对比分析运算的形式，实现对局部电网频率及电压的调节，使电网质量符合当前负荷，确保了电网的安全使用。
附图说明
图1是本发明所揭示的户用储能系统动态调节局部电网质量的系统的框架图；
图2表示功率因子Cos(Phi)和P/Pn边界条件图；
图3表示P1和P2为同象限时的方程图；
图4表式P1和P2为不同象限时的方程图。
具体实施方式
下面将结合本发明的附图，对本发明实施例的技术方案进行清楚、完整的描述。
如图1所示，本发明所揭示的一种户用储能系统动态调节局部电网质量的系统，包括电表，能量管理系统，并网逆变器，无线电网调度装置，其中所述能量管理系统，并网逆变器，无线电网调度装置组成被动式调度系统，电表，能量管理系统及并网逆变器组成主动式调度系统，在被动式调度系统无法使用时，主动式调度系统进行调度操作。
具体说来，所述被动式调度系统中，无线电网调度装置无线获取电网公司的实时电网质量信息，并将获取的电网质量信息发送至能量管理系统，能量管理系统根据反馈的电网质量信息结合预设的标准阈值进行分析运算，获得电网频率及电压波动范围值，并通过并网逆变器作为执行单元输出有功电能或无功电能至电网进行调节。
所述主动式调度系统中，电表连接电网获取当前电网质量信息，并将电网质量信息反馈至能量管理系统，能量管理系统根据反馈的信息结合预设的标准阈值进行运算分析，获得电网频率及电压波动范围值，并通过并网逆变器作为执行单元输出有功电能或无功电能至电网进行调节。
所述电网质量信息包括电网电压值和电网频率值。
所述无线调度装置为xx公司的Ripple control receiver，其具有无线获取电网公司电网信息的功能，通过其六个端子实现与能量管理系统内MCU的电连接，六个端子分别为有功功率端子，无功功率端子，D_IN1～D_IN4号端子，其中D_IN1～D_IN4号端子与有功功率端子之间分别连接有开关K1～K4，与无功功率之间分别连接有开关K5～K8，无线调度装置给能量管理系统的有功控制信号来自K1～K4，而无功控制信号来自K5～K8，且逻辑0表示开，逻辑1表示闭合， 具体真值表参见表1和表2。
表1：
Figure PCTCN2018092992-appb-000001
表2
Figure PCTCN2018092992-appb-000002
本发明所揭示的一种户用储能系统动态调节局部电网质量的方法，其包括如 下内容：
S1、无线电网调度装置采用无线形式实时获取电网公司的电网质量信息，该电网质量信息包括电网电压值和电网频率值；
S2、无线电网调度装置将获取的电网质量信息通过干接点状态实时传送给能量管理系统，能量管理系统将接收到的电网质量信息结合内部预设的标准阈值进行分析运算；
S3、通过电表获取的电网质量信息首先将接收到的电网频率进行对比，若接收到的电网频率值低于阈值，则能量管理系统运算出有功功率下降调节值，并通过并网逆变器输出至电网进行电网频率的调整，若接收到的电网频率高于阈值，则能量管理系统运算出需消耗的有功功率值；通过无线电网调度装置获取电网质量信息，根据干接点状态查表输出调节电网质量
S4、通过电表获取的电网质量信息将接受到的电网电压值进行对比，若接收到的电网电压值低于阈值，则能量管理系统运算出无功功率下降调节值，并通过并网逆变器输出至电网进行电网电压的调整，若接收到的电网电压高于阈值，则能量管理系统运算出需消耗的无功功率值；通过无线电网调度装置获取电网质量信息，根据干接点状态运用无功算法算出需消耗的无功功率值输出调节电网质量；
S5、重复上述步骤S1～S4直至到达预设标准阈值；
S6、若无线电网调度装置无法获取电网公司当前电网质量时，通过电表进行当前电网质量信息采集，采集的电网质量信息包括电网电压值和电网频率值，然后将采集的电网质量信息通过RS485方式传送至能量管理系统；
S7、能量管理系统根据电表反馈的电网质量信息，结合内部预设的标准阈值进行分析运算，具体分析运算参见步骤S3和S4。
在具体的功率调度中，具体的调度算法如下：
有功调度算法：
EMS通过检测到D_IN1,D_IN2,D_IN3,D_IN4信号为X(X为1，2，4，8)，通过表1可知，有功功率可通过查表获得；
无功功率控制算法
为了实现无功调节准确，EMS需要得到无功功率Q，因此在协议需要添加无功功率Q
,无功功率Q通过可变的Cos(Phi)来获得。
设置功率因子Cos(Phi)和P/Pn边界条件，参见图2；
P表示实时功率，Pn是额定功率，当P/Pn<0.5，表示电压超前电流，P/Pn>0.5，电压滞后电流。
假设：采用直线方程来拟合得到动态的Cos(Phi)，和P/Pn的关系，K＝AQ+B；设Q＝Cos(Phi)，K＝P/Pn，用户需要设置的两点P1(K1，Q1)，P2(K2，Q2)；
参见图3，当P1和P2为同象限时：方程为一条直线和两条水平线。
带入方程：解得A＝(Q2-Q1)/(K2-K1),B＝(K2*Q1-K1*Q2)/(K2-K1)；通过方程代入得动态Cos(Phi)；
参见图4，当P1和P2为不同象限时：方程为两条分段直线：通过直线的特殊性可得到第三点P3((K1+K2)/2,1)：通过类似的方法可算出两条直线方程，分别求出A和B。得到动态COS(Phi)。
为了机器稳定，尽量减少经常改变Cos(Phi)，采用过滤的方式不经常改变Cos(Phi)值，假设上次调整的功率因素为cos(Phi1)，当前改变的功率因素为cos(Phi2)；
当abs(cos(Phi2)-cos(Phi1))>e(e是阈值)时EMS才发送指令给注册的逆变器。这样免于每次都发送Cos(Phi)给逆变器。
本发明的技术内容及技术特征已揭示如上，然而熟悉本领域的技术人员仍可能基于本发明的揭示而作种种不背离本发明精神的替换及修饰，因此，本发明保护范围应不限于实施例所揭示的内容，而应包括各种不背离本发明的替换及修饰，并为本专利申请权利要求所涵盖。

Claims (4)

  1. 一种户用储能系统动态调节局部电网质量的系统，其特征在于：包括能量管理系统，并网逆变器，无线电网调度装置，其中所述无线电网调度装置无线获取电网公司的实时电网质量信息，并将获取的电网质量信息以干接点状态的形式给能量管理系统，能量管理系统根据反馈的电网质量信息结合预设的标准阈值进行分析运算，获得电网频率及电压波动范围值并通过并网逆变器作为执行单元输出有功电能或无功电能至电网进行调节。
  2. 根据权利要求1所述的一种户用储能系统动态调节局部电网质量的系统，其特征在于：还包括电表与能量管理系统及储能逆变器组成主动式调节，其中电表连接电网获取当前电网质量信息，并将电网质量信息反馈至能量管理系统，能量管理系统根据反馈的信息结合预设的标准阈值进行运算分析，获得电网频率及电压波动范围值，并通过并网逆变器作为执行单元输出有功电能或无功电能至电网进行调节。
  3. 根据权利要求1或2所述的一种户用储能系统动态调节局部电网质量的系统，其特征在于：所述电网质量信息包括电网电压值和电网频率值。
  4. 一种基于权利要求1～2的系统所实现的动态调节局部电网质量的方法，其特征在于包括如下内容：
    S1、无线电网调度装置采用无线形式实时获取电网公司的电网质量信息，该电网质量信息包括电网电压值和电网频率值；
    S2、无线电网调度装置将获取的电网质量信息通过干接点状态实时传送给能量管理系统，能量管理系统将接收到的电网质量信息结合内部预设的标准阈值进行分析运算；
    S3、首先将接收到的电网频率进行对比，若接收到的电网频率值低于阈值，则能量管理系统运算出有功功率下降调节值，并通过并网逆变器输出至电网进 行电网频率的调整，若接收到的电网频率高于阈值，则能量管理系统运算出需消耗的有功功率值；通过无线电网调度装置获取电网质量信息，根据干接点状态查表输出调节电网质量；
    S4、然后将接受到的电网电压值进行对比，若接收到的电网电压值低于阈值，则能量管理系统运算出无功功率下降调节值，并通过并网逆变器输出至电网进行电网电压的调整，若接收到的电网电压高于阈值，则能量管理系统运算出需消耗的无功功率值；通过无线电网调度装置获取电网质量信息，根据干接点状态运用无功算法算出需消耗的无功功率值输出调节电网质量；
    S5、重复上述步骤S1～S4直至到达预设标准阈值；
    S6、若无线电网调度装置无法获取电网公司当前电网质量时，通过电表进行当前电网质量信息采集，采集的电网质量信息包括电网电压值和电网频率值，然后将采集的电网质量信息通过RS485方式传送至能量管理系统；
    S7、能量管理系统根据电表反馈的电网质量信息，结合内部预设的标准阈值进行分析运算，具体分析运算参见步骤S3和S4。
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