Products Category

High Voltage Dynamic Reactive Power Compensation Device

High Voltage Dynamic Reactive Power Compensation Device

YDK-SVGH
It can provide capacitive and inductive reactive power quickly and continuously, realize appropriate voltage and reactive power control, and ensure stable, efficient and high-quality operation of the power system.

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Features Technical Indicators Overall Dimension

YDK-SVGH series high-voltage static VAR generator is an SVG compensation system with IGBT as the core. SVG (static VAR generator) is one of the main devices of Flexible AC Transmission System (FACTS), which represents the new development direction of reactive power compensation technology in the current power system. High-voltage static VAR generator can quickly and continuously provide capacitive and inductive reactive power, realize appropriate voltage and reactive power control, and ensure stable, efficient and high-quality operation of the power system.
In the distribution network, installing small and medium-capacity devices near certain special loads (such as arc furnaces) can significantly improve the power quality at the connection point between the load and the public power grid, such as improving power factor, overcoming three-phase imbalance, eliminating voltage flicker and voltage fluctuation, suppressing harmonic pollution, etc.

1.2 Technical conditions
1.2.1 Environmental conditions
The device can work normally under the following environmental conditions:
a) Working environment temperature: 0℃～+40℃, storage environment temperature -10℃～+45℃, no excitation is applied under the limit value, the device does not show irreversible changes, and the device should be able to work normally after the temperature is restored.
b) Relative humidity: The average maximum relative humidity of the wettest month is 80%, and the average minimum temperature of the month is 25℃ and there is no condensation on the surface.
c) Atmospheric pressure: 80kPa～110kPa (relative to an altitude of 2km or less).
d) The use site shall not have fire, explosion, corrosion and other dangers that endanger the safety of the device, and vibration, impact and collision that exceed the requirements of this manual.
1.2.2 Main technical parameters of the device
a) Rated working voltage: 3KV, 6kV, 10kV, 35kV.
b) Rated capacity: 1~100MVar.
c) Output reactive power range: Continuously change from inductive rated reactive power to capacitive rated reactive power.
d) Controller response time: <.1ms.
e) Output voltage total harmonic distortion rate (before grid connection): <.5%.
f) Output voltage total harmonic distortion rate (after grid connection): <.3%.
g) Output current total harmonic distortion rate: <.3%.
h) Output voltage asymmetry: <.3%.
i) Efficiency: ≥99%.
j) Ambient temperature: 0℃~+40℃.
k) Human-machine interface: Chinese display operation interface is adopted.
1.2.3 Basic principles

The principle wiring diagram of SVG is shown above. The basic principle of SVG is to connect the self-commutated bridge circuit in parallel to the power grid through a transformer or reactor. By properly adjusting the amplitude and phase of the output voltage on the AC side of the bridge circuit, or directly controlling the AC side current, the circuit can absorb or emit reactive current that meets the requirements, thereby achieving the purpose of dynamic reactive compensation.

Operation Mode	Waveform	Phase diagram	illustrate
No-load operation mode			If Vs = Vc, then Ics = 0
Capacitive operation mode			If Vc>.Vs, then Ics is the leading current. Because the amplitude of this current can be continuously controlled by adjusting Vc, the STATCOM acts as a capacitor and its capacitive reactance can be continuously controlled.
Inductive operation mode			If Vc<.Vs, Ics is the lagging current. At this time, STATCOM acts as a reactor, and its inductive reactance can be continuously controlled.

1.2.4 System Structure

The entire device structure is shown in the figure below (taking a 10kV device and a transformer step-up to 35kV system as an example).

Figure 1-2 Typical structure diagram of complete set of equipment

The device consists of three power cabinets, a control cabinet, a reactor cabinet and a connecting transformer. The composition of the device is shown in the table below.

Table 1-1 Composition of the device
	Content	Effect
1. Primary system	① Reactor cabinet	Device connection with 10kV busbar and soft start charging control
	②Connect a transformer or a reactor	Connect device output to 35kV system
	③Power cabinet	Power Unit
2. Secondary system	①Controller	Device control, operating status monitoring and abnormal protection
	②Sensor (transducer)	Isolation of strong and weak system signals
	③Secondary control power supply	Control system power supply
3. Auxiliary parts	① Water (air) cooling system	Power module cooling of the device
3. Auxiliary parts	②Fiber optic connection system	Control cabinet and power cabinet signal connection

1.3 Models and specifications

The models and specifications of the YDK-SVGH series products are shown in the following table.

6KV series (Note: The dimensions are subject to change without prior notice, and the specific dimensions are subject to the technical agreement)

Model	SVG Capacity (Mvar)	SVG rated output current (A)	Cooling method	SVG installation room dimensions (3.5m)		FC installation room dimensions (3.5m high)
Model	SVG Capacity (Mvar)	SVG rated output current (A)	Cooling method	Length (m)	Width (m)	Length (m)	Width (m)
YDK-SVGH-C2.0/6	±2	192	Air Cooling	7.5	3.5	7.5	3
YDK-SVGH-C3.0/6	±3	288	Air Cooling	8	3.5	8	3
YDK-SVGH-C5.0/6	±5	480	Air Cooling	9	3.5	9	3

10KV series (Note: The dimensions are subject to change without prior notice, the specific dimensions are subject to the technical agreement)

Model	SVG Capacity (Mvar)	SVG rated output current (A)	Cooling method	SVG installation room dimensions (3.5m)		FC installation room dimensions (3.5m high)
Model	SVG Capacity (Mvar)	SVG rated output current (A)	Cooling method	Length (m)	Width (m)	Length (m)	Width (m)
YDK-SVGH-C2.0/10	±2	115	Air Cooling	9	3.5	9	3
YDK-SVGH-C3.0/10	±3	173	Air Cooling	9	3.5	9	3
YDK-SVGH-C5.0/10	±5	288	Air Cooling	10	3.5	10	3
YDK-SVGH-C8.0/10	±8	480	Air Cooling	11	3.5	11	3.5
YDK-SVGH-C10/10	±10	576	Air Cooling	11.5	3.5	11.5	3.5
YDK-SVGH-C15/10	±15	864	Air Cooling	14.5	3.5	14.5	3.5
YDK-SVGH-C20/10	±20	1154	Water Cooling	15.5	3	15.5	3
YDK-SVGH-C30/10	±30	1735	Water Cooling	16.5	3	16.5	3

35KV Series (Note: Dimensions are subject to change without prior notice, specific dimensions are subject to technical agreement)

Model	SVG Capacity (Mvar)	SVG rated output current (A)	Cooling method	SVG installation room dimensions (3.5m)		FC installation room dimensions (3.5m high)
Model	SVG Capacity (Mvar)	SVG rated output current (A)	Cooling method	Length (m)	Width (m)	Length (m)	Width (m)
YDK-SVGH-C8.0/35	±8	132	Air Cooling	17	3	7.8	6
YDK-SVGH-C16/35	±16	264	Air Cooling	19	3	9	7
YDK-SVGH-C30/35	±30	495	Water Cooling	11.5	6	11.5	7
YDK-SVGH-C40/35	±40	660	Water Cooling	13.5	6	13.5	7
YDK-SVGH-C50/35	±50	825	Water Cooling	13.5	6	13.5	7
YDK-SVGH-C75/35	±75	1237	Water Cooling	16.5	7	16.5	7.5
YDK-SVGH-C100/35	±100	1650	Water Cooling	16.5	7	16.5	8.5

Note:

1) The above table shows products of 6kV and above, all of which adopt chain structure.

2) Note on capacity: Capacity (MVar) indicates the rated maximum adjustment capacity within the dynamic adjustment range from inductive to capacitive. For example, YDK-SVGH-C2.0/6, which is a 6kV device with a capacity of ±2MVar, can continuously and smoothly adjust reactive power from +2000kVar (inductive) to -2000kVar (capacitive).

3) 6kV series products and 10kV YDK-SVGH series products with a capacity of less than 10MVar usually use iron core reactors. The table lists the dimensions of the complete set of equipment including iron core reactors (excluding high-voltage switchgear). High-voltage switchgear is selected or purchased by the user.

4) 35kV and 10kV series products with a capacity of more than 15MVar usually use air-core reactors. The table lists the installation dimensions of the control cabinet and power cabinet, and gives the overall indoor installation dimensions of the complete set of equipment. You can refer to this overall installation dimension for engineering design.

5) The product is constantly being modified. Please refer to the above data. The company reserves the right to upgrade and change.

1.3 Models and specifications

The models and specifications of the YDK-SVGH series products are shown in the following table.

6KV series (Note: The dimensions are subject to change without further notice. The specific dimensions are subject to the technical agreement)

Model	SVG Capacity (Mvar)	SVG rated output current (A)	Cooling method	SVG installation room dimensions (3.5m)		FC installation room dimensions (3.5m high)
Model	SVG Capacity (Mvar)	SVG rated output current (A)	Cooling method	Length (m)	Width (m)	Length (m)	Width (m)
YDK-SVGH-C2.0/6	±2	192	Air Cooling	7.5	3.5	7.5	3
YDK-SVGH-C3.0/6	±3	288	Air Cooling	8	3.5	8	3
YDK-SVGH-C5.0/6	±5	480	Air Cooling	9	3.5	9	3

10KV series (Note: The dimensions are subject to change without prior notice, the specific dimensions are subject to the technical agreement)

Model	SVG Capacity (Mvar)	SVG rated output current (A)	Cooling method	SVG installation room dimensions (3.5m)		FC installation room dimensions (3.5m high)
Model	SVG Capacity (Mvar)	SVG rated output current (A)	Cooling method	Length (m)	Width (m)	Length (m)	Width (m)
YDK-SVGH-C2.0/10	±2	115	Air Cooling	9	3.5	9	3
YDK-SVGH-C3.0/10	±3	173	Air Cooling	9	3.5	9	3
YDK-SVGH-C5.0/10	±5	288	Air Cooling	10	3.5	10	3
YDK-SVGH-C8.0/10	±8	480	Air Cooling	11	3.5	11	3.5
YDK-SVGH-C10/10	±10	576	Air Cooling	11.5	3.5	11.5	3.5
YDK-SVGH-C15/10	±15	864	Air Cooling	14.5	3.5	14.5	3.5
YDK-SVGH-C20/10	±20	1154	Water Cooling	15.5	3	15.5	3
YDK-SVGH-C30/10	±30	1735	Water Cooling	16.5	3	16.5	3

35KV Series (Note: Dimensions are subject to change without prior notice, specific dimensions are subject to technical agreement)

Model	SVG Capacity (Mvar)	SVG rated output current (A)	Cooling method	SVG installation room dimensions (3.5m)		FC installation room dimensions (3.5m high)
Model	SVG Capacity (Mvar)	SVG rated output current (A)	Cooling method	Length (m)	Width (m)	Length (m)	Width (m)
YDK-SVGH-C8.0/35	±8	132	Air Cooling	17	3	7.8	6
YDK-SVGH-C16/35	±16	264	Air Cooling	19	3	9	7
YDK-SVGH-C30/35	±30	495	Water Cooling	11.5	6	11.5	7
YDK-SVGH-C40/35	±40	660	Water Cooling	13.5	6	13.5	7
YDK-SVGH-C50/35	±50	825	Water Cooling	13.5	6	13.5	7
YDK-SVGH-C75/35	±75	1237	Water Cooling	16.5	7	16.5	7.5
YDK-SVGH-C100/35	±100	1650	Water Cooling	16.5	7	16.5	8.5

Note:

1) The above table shows products of 6kV and above, all of which adopt chain structure.

4) For 35kV and 10kV series products with a capacity of more than 15MVar, air-core reactors are usually used. The table lists the installation dimensions of the control cabinet and power cabinet, and gives the overall indoor installation dimensions of the complete set of equipment. You can refer to this overall installation dimension for engineering design.

5) The product is constantly being modified. Please refer to the above data. The company reserves the right to upgrade and change.

1.4 Product Configuration

As a standard product, the YDK-SVGH series high-voltage static var generator provides the various components listed in the standard configuration table. The components in the optional configuration are selected by the user according to their own needs. They are not included in the scope of standard products and need to be purchased separately.

1.4.1 Standard Configuration

Table 1-2 Product Standard Configuration Table

Component Name	Configuration quantity	Remark
Connecting reactor or connecting transformer	1
Reactor cabinet	1
Power cabinet	1～4	Depending on the power range, it can be divided into multiple cabinets
Control cabinet	1
Backup power unit	1
Technical Documents	See packing list	User manual and necessary drawings and materials
Water Cooling Cabinet	1	Air Cooling device without Water Cooling cabinet

1.4.2 Optional Configuration
Table 1-3 Product optional configuration table

Component Name	Configuration quantity	Remark
Protection cabinet	1	As protection for connecting transformers or fixed capacitor compensation
Circuit breaker cabinet	1	For users without circuit breaker cabinet or new users
Power Unit	User selection	Easy maintenance
Power unit control board	User selection	Requires users to have good electronic and electrical maintenance conditions
Connecting cables	User selection	Select when external connection is required
Remote monitoring system	1	Select when remote operation control is required
Other / Other special requirements of users can be negotiated