CNO - TI 20220906 SG3400HV-30 and SG3125HV-30 Series Grid Support V11 EN (1) de 2024

Version 1.0

SG3400HV-30 and SG3125HV-30 Series Grid SupportConfidential

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1. Introduction This document describes the grid support of SG3125HV-30, SG3125HV-MV-30, SG3400HV30 ,SG3400HV-MV-30 and series.

This document is intended to be used by the specific addressees. No part of this document may be reproduced or distributed in any form or by any means without the prior written permission of Sungrow Power Supply Co., Ltd.

2. SG3125HV-30 & SG3400HV-30 Series Grid Support This product meets the requirements of IEC standard.

Using reactive power control, we can able to achieve Pf (Fixed Power Factor), Q(t) (Fixed Reactive Power Ratio), Q(U) (Voltage and Reactive Power Regulation), Q(P)(Q is related with P). Using active power control, we can able to achieve power grid dispatching function and active power response time regulation function. In FRT state, the inverter can quickly respond to the changes of the power grid and support the power grid.

3. Active & Reactive & FRT Power Control

3.1. Reactive Power Control 3.1.1. Pf Mode Pf mode: the power factor is fixed and reactive power setpoint is calculated according to the current power.The adjustable range of the power factor is -0.8~+0.8, and the adjustment curve in the Pf mode is shown in the fig.1 below. The shaded area in the figure shows the P -Q capability of the inverter in Pf mode.Confidential

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50°C 45°C 3437kW 3125kW Ind. Q (kVar) P (kW) 2062kVaar 1875kVar 2500kW 2750kW 3437kVA @PF=0.8

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50°C 45°C 3437kW 3125kW Ind. Q (kVar) P (kW) 2062kVaar 1875kVar 2500kW 2750kW 3437kVA @PF=0.8

Fig.1. The P-Q Capability (Pf mode) The Pmax=3437kW, Smax=3437kVA. The Max. Q is +/-2062 kVar, when the power factor is +/-0.8,at 45℃; The Q is +/-1498 kVar, when the power factor is +/-0.9,at 45℃. 3.1.2. Q(t) Mode In the Q(t) mode, system rated reactive power is fixed, and the system outputs reactive power according to the delivered reactive power ratio. 50°C 45°C 3437kW 3125kW Ind. Q (kVar) P (kW) 2062kVar 1875kVar 2500kW 2750kW 3437kVA @PF=0.8

Fig.2. The P-Q Capability [Q(t) mode] The Pmax=3437kW, Smax=3437kVA. The Max. Q is +/-2062 kVar, when the power factor is +/-0.8,at 45℃; The Q is +/-1498 kVar, when the power factor is +/-0.9,at 45℃. 3.1.3. Q(U) ModeConfidential

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Parameter Definition/Setting description Range Default value QU enable power(%) In QU mode, the QU function will be enabled when the actual output active power percentage is greater than the set value 0-100 0 QU operation mode In QU reactive power mode, the method to set the reactive power value Var PCT adj/ TanPhi adj/ CosPhi.adj Var PCT adj QU input type QU function input voltage type; the max./min

0-100 0 QU operation mode In QU reactive power mode, the method to set the reactive power value Var PCT adj/ TanPhi adj/ CosPhi.adj Var PCT adj QU input type QU function input voltage type; the max./min value of the real time grid voltage or during grid voltage change RT volt/Record volt RT volt QU PF Start The lower limits of compensation power factor caused by grid voltage change; setting is available when the QU operation mode is TanPhiadj or CosPhiadj 0.8~1 Countryspecific QU PF End The Upper limits of compensation power factor caused by grid voltage change; setting is available when the QU operation mode is TanPhiadj or CosPhiadj 0.8~1 Countryspecific QU volt rise start (%) Refer to U1i in "fig.3 Q(U) Mode Curve" 100~110 Countryspecific QU volt rise end (%) Refer to U2i in "fig.3 Q(U) Mode Curve" 100~110 Countryspecific QU volt drop start(%) Refer to U1s in "fig.3 Q(U) Mode Curve" 90~100 Countryspecific QU volt drop end(%) Refer to U2s in "fig.3 Q(U) Mode Curve" 90~100 Countryspecific

Fig.3. Q(U) Mode Curve 3.1.4. Q(P) Mode Parameter Definition/Setting description Range Default value Q(P) upper PF Power factor of point P1 in "fig.4 Q(P) mode curve " 0.9~1 1 Q(P) lower PF Power factor of point P2 in "fig 4 Q(P) mode curve " 0.9~1 0.9 Q(P) upper power(%) Output power of point P2 in "fig 4 Q(P) mode curve " 50~100 100 Q(P) lower power(%) Output power of point P1 "fig 4 Q(P) mode curve " 0~50 50Confidential

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Q(P) upper power(%) Output power of point P2 in "fig 4 Q(P) mode curve " 50~100 100 Q(P) lower power(%) Output power of point P1 "fig 4 Q(P) mode curve " 0~50 50Confidential

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Fig.4. Q(P) Mode Curve 3.2. Active Power Control 3.2.1. Active Power Regulation The active power ramp rate can be set to control how the inverter increases or deceases its output power when the PV power is increased due to irradiation rise or decreased due to power limitation. Ramp Rate Time (s) Targe

Fig.5. Ramp Rate Control Parameter Definition/Setting description Range Default value T-start-wait (s) Time interval between the moment at which the AC/DC parameters meet the grid-connection requirements and the moment at which the inverter begins to generate power. 0~600 60 T-stop-delay (s) Time interval between the moment at which the stop command is sent via the LCD display or the PC and the moment at which the inverter executes the stop command. 0~600 0Confidential

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Parameter Definition/Setting description Range Default value Stop slope (%/s) Active power decline rate over the time from the moment at which the Turnkey Station executes stop command to the moment at which the inverter stops. 0.1~500 100 Start slope (%/s) Active power rise rate over the time from the moment at which the inverter executes the start command to the moment at which the Turnkey Station starts. 0.01~100 10 P-rise rate (%/s) Rate of rise of the active power Percentage that the active power rise per second accounted for the nominal power (%/s). 0.01~500 Country-specific P-decline rate (%/s) Rate of decline of the active power. 0.01~500 Country-specific Limit Power (%)

Rate of rise of the active power Percentage that the active power rise per second accounted for the nominal power (%/s). 0.01~500 Country-specific P-decline rate (%/s) Rate of decline of the active power. 0.01~500 Country-specific Limit Power (%) Percentage of the active power output to the nominal output power (%). 0~110 110 Parameter that can be set by professional personnel. 3.2.2. Frequency Derating Function

Fig.6. The relation curve between the active power and the frequency Parameters Range Default Descriptions FW func enable Enable/Disable Disable To enable/Disable the FW function FW output change base Rated-P/Prederate-P Countryspecific The standard of active power change caused by frequency change OF decrease start(Hz) 50~55 / 60~65 Countryspecific Refer to f1i in Fig.6The relation curve between the active power and the frequency OF decrease end(Hz) 50~55 / 60~65 Countryspecific Refer to f2i in Fig.6The relation curve between the active power and the frequency OF decrease slope 0~2 Countryspecific Refer to K1 in Fig.6The relation curve between the active power and the frequency OF decrease limit (%) 0~110 Countryspecific Refer toΔP1 in Fig.6The relation curve between the active power and the frequency FW input type RT-freq/Recordfreq Countryspecific The input frequency type of the FW function. The max./min value of the real-timeConfidential

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frequency or during frequency change FW enable power(%) 0~115 0 After the FW function is enabled, the FW function is started when the percentage of the actual output active power is bigger than the set value UF increase start(Hz) 45~50 / 55~60 Countryspecific

frequency or during frequency change FW enable power(%) 0~115 0 After the FW function is enabled, the FW function is started when the percentage of the actual output active power is bigger than the set value UF increase start(Hz) 45~50 / 55~60 Countryspecific Refer to f1s in Fig.6The relation curve between the active power and the frequency UF increase end(Hz) 45~50 / 55~60 Countryspecific Refer to f2s in Fig.6The relation curve between the active power and the frequency UF increase slope 0~2 Countryspecific Refer to K2 in Fig.6The relation curve between the active power and the frequency UF increase limit(%) 0~110 Countryspecific Refer to ΔP2 in Fig.6The relation curve between the active power and the frequency

3.3. FRT Power Control The inverter can detect the abnormal frequency and respond quickly. Users can set the frequency protection range through the LCD screen to comply with local national grid standards. Parameters Range Default Descriptions Ⅰ_Fgrid-max(Hz) 50~55/60~65 Countryspecific The grid over-frequency protection I value. Protection is activated when frequency exceeds this value Ⅱ_Fgrid-max(Hz) 50~55/60~65 Countryspecific The grid over-frequency protection II value. Protection is activated when frequency exceeds this value Ⅲ_Fgrid-max(Hz) 50~55/60~65 Countryspecific The grid over-frequency protectionⅢvalue. Protection is activated when frequency exceeds this value Ⅳ_Fgrid-max(Hz) 50~55/60~65 Countryspecific The grid over-frequency protectionⅣvalue. Protection is activated when frequency exceeds this value Ⅴ_Fgrid-max(Hz) 50~55/60~65 Countryspecific The grid over-frequency protectionⅤvalue. Protection is activated when frequency exceeds this value Recover_FgridThe grid over-frequency protectionⅣvalue. Protection is activated when frequency exceeds this value Ⅴ_Fgrid-max(Hz) 50~55/60~65 Countryspecific The grid over-frequency protectionⅤvalue. Protection is activated when frequency exceeds this value Recover_Fgridmax(Hz) 50~55/60~65 Countryspecific The inverter recovers normal operation when grid frequency is below this value Ⅰ_T-Fhigh trip(ms) 40~36000000 Countryspecific The grid over-frequency I tripping time Ⅱ_T-Fhigh trip (ms) 40~36000000 Countryspecific The grid over-frequency II tripping time Ⅲ_T-Fhigh trip(ms) 40~36000000 Countryspecific The grid over-frequency Ⅲ tripping time Ⅳ_T-Fhigh trip (ms) 40~36000000 Countryspecific The grid over-frequency Ⅳ tripping time Ⅴ_T-Fhigh trip(ms) 40~36000000 Countryspecific The grid over-frequencyⅤ tripping time Ⅰ_Fgrid-min(Hz) 45~50/55~60 Countryspecific The grid under-frequency protection I value. Protection is activated when frequency exceeds this value Ⅱ_Fgrid-min(Hz) 45~50/55~60 CountryThe grid under-frequency protection II value.Confidential

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specific Protection is activated when frequency exceeds this value Ⅲ_Fgrid-min(Hz) 45~50/55~60 Countryspecific The grid under-frequency protection Ⅲ value. Protection is activated when frequency exceeds this value Ⅳ_Fgrid-min(Hz) 45~50/55~60 Countryspecific The grid under-frequency protection Ⅳ value. Protection is activated when frequency exceeds this value Ⅴ_Fgrid-min(Hz) 45~50/55~60 Countryspecific The grid under-frequency protection Ⅴ value. Protection is activated when frequency exceeds this value Recover_FgridProtection is activated when frequency exceeds this value Ⅴ_Fgrid-min(Hz) 45~50/55~60 Countryspecific The grid under-frequency protection Ⅴ value. Protection is activated when frequency exceeds this value Recover_Fgridmin(Hz) 45~50/55~60 Countryspecific The inverter recovers normal operation when grid frequency is above this value Ⅰ_T-Flow trip(ms) 40~36000000 Countryspecific The grid under-frequency I tripping time Ⅱ_T-Flow trip (ms) 40~36000000 Countryspecific The grid under-frequency II tripping time Ⅲ_T-Flow trip(ms) 40~36000000 Countryspecific The grid under-frequency Ⅲ tripping time Ⅳ_T-Flow trip (ms) 40~36000000 Countryspecific The grid under-frequency Ⅳ tripping time Ⅴ_T-Flow trip (ms) 40~36000000 Countryspecific The grid under-frequency Ⅴtripping time 3.3.1. Low Voltage Ride Through (LVRT) LVRT requires the PV plant to stay in operation within certain voltage drop rang e due to the grid failure or disturbance; meanwhile, PV plant should provide the dynamic support by feeding the reactive power to the grid in response to grid voltage dip level.

Note: T1, T2, U1 and U2 are all settable parameters.

Fig.7. Lower Voltage Ride Through The LVRT parameters can be set to meet the different requirements of different grid codes; Parameters Range Default Descriptions LVRT switch Enable/Disable Countryspecific Enable or disable the LVRT switch LVRT T1(ms) 40~36000000 Countryspecific Parameters related to the LVRTConfidential

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LVRT T2(ms) 40~36000000 Countryspecific Parameters related to the LVRT LVRT T3(ms) 40~36000000 Countryspecific Parameters related to the LVRT

specific Parameters related to the LVRTConfidential

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LVRT T2(ms) 40~36000000 Countryspecific Parameters related to the LVRT LVRT T3(ms) 40~36000000 Countryspecific Parameters related to the LVRT LVRT T4(ms) 40~36000000 Countryspecific Parameters related to the LVRT LVRT T5(ms) 40~36000000 Countryspecific Parameters related to the LVRT LVRT voltage1(%) 5~90 Countryspecific Parameters related to the LVRT LVRT voltage2(%) 5~90 Countryspecific Parameters related to the LVRT LVRT voltage3(%) 5~90 Countryspecific Parameters related to the LVRT LVRT voltage4(%) 5~90 Countryspecific Parameters related to the LVRT LVRT voltage5(%) 5~90 Countryspecific Parameters related to the LVRT LVRT dynamic Var Kf factor 0~10 Countryspecific Ratio of reactive power compensation and voltage dip depth during LVRT 3.3.2. High Voltage Ride Through (HVRT) The HVRT requires the PV plant to stay in operation within a certain voltage rise range due to the grid disturbance.

Note: T1, T2, U1 and U2 are all settable parameters.

Fig.8. High Voltage Ride Through Parameters Range Default Descriptions HVRT switch Enable/Disable Enable Enable or disable the HVRT switch HVRT T1(ms) 40~36000000 Countryspecific Parameters related to the HVRT HVRT T2(ms) 40~36000000 Countryspecific Parameters related to the HVRT HVRT T3(ms) 40~36000000 Countryspecific Parameters related to the HVRTConfidential

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HVRT T4(ms) 40~36000000 Countryspecific

specific Parameters related to the HVRT HVRT T3(ms) 40~36000000 Countryspecific Parameters related to the HVRTConfidential

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HVRT T4(ms) 40~36000000 Countryspecific Parameters related to the HVRT HVRT T5(ms) 40~36000000 Countryspecific Parameters related to the HVRT HVRT voltage1(%) 110~140 110 Parameters related to the HVRT HVRT voltage2(%) 110~140 Countryspecific Parameters related to the HVRT HVRT voltage3(%) 110~140 130 Parameters related to the HVRT HVRT voltage4(%) 110~140 130 Parameters related to the HVRT HVRT voltage5(%) 110~140 130 Parameters related to the HVRT HVRT dynamic Var Kf factor 0~10 Countryspecific Ratio of reactive power compensation and voltage dip depth during HVRT