TH-SVG Series High Voltage Dynamic Reactive Power Compensation Device

By using the most advanced instantaneous reactive power theory and the power decoupling algorithm that is based on synchronous coordinate transformation

Classification:

SVG

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1. Basic Principle

By using the most advanced instantaneous reactive power theory and the power decoupling algorithm that is based on synchronous coordinate transformation, TH-SVG applies to the modern power electronics, electric energy control, automation, micro-electronics and network communication technology, to realize reactive quick compensation of system. It can effectively maintain the voltage stability of system and realize harmonic suppression even if the grid system has major disturbance.

When used in power transmission grid, TH-SVG is mainly used for: Providing voltage supports dynamically and restraining the system overvoltage in case the system has a fault or sudden load increase, to ensure the stability of power transmission line: Power oscillation of damping power system.

When used in power distribution network, TH-SVG is mainly used for quality control of electric energy, maintaining the busbar voltage through dynamic reactive quick compensation, effectively restraining voltage flicker, or realizing real-time dynamic compensation of impact load or harmonic load through current tracking compensation, in order to improve the power factor.

2. Model Description

3. Performance Features

◆ Fast response

Based on the high-power switching device such as IGBT and instantaneous reactive power algorithm, the TH-SVG hardware system can quickly restrain the voltage fluctuation, voltage flicker and realize reactive power compensation within the response time of 30ms, to greatly reduce the power rush of load and protect the electrical equipment.

◆ Low harmonic

Based on the chain main-circuit structure and high-frequency PWM control technique, TH-SVG can reduce less sub-harmonic and effectively reduce the pollution of power grid due to harmonic wave.

◆ Wide operating range

The reactive current provided by TH-SVG decreases as the busbar decreases. When the busbar is too low, the reactive compensation ability of TH-SVG is weak; The reactive power output is directly proportional to the busbar, and the reactive current provided is independent of the busbar. When the busbar decreases, TH-SVG operates in a constant current source state, and its ability to compensate for reactive power is weak. The reactive power compensation capability of TH-SVG devices with the same capacity is equivalent to 1.3-1.5 times that of SVC devices with the same capacity.

◆ Low power, low noise, and space-saving

The TH-SVG chain main circuit does not require large capacity multiple transformers, multiple filters, and large capacity reactors, with low power consumption and low noise (about 15dB). TH-SVG of the same capacity occupies no more than half of the SVC area.

◆ Advanced technology

Using advanced PSCAD power system simulation technology for product design and system validation.

The reactive power detection and control technology within 10ms can detect and follow the changes in system reactive power in real-time, especially suitable for rapid reactive power compensation of sudden loads, with significant energy-saving effects.

Carrier phase shifted SPWM control technology, capacitor DC voltage balancing technology, relay protection and monitoring protection technology. The application of specialized valve body crimping technology and switch device buffering technology ensures the reliability of IGBT valve string operation.

The main controller adopts a fully enclosed anti-interference unit chassis, a new back structure design, double-layer shield, and the control bus is not externally connected to reduce electromagnetic interference.

Flexible control methods, can adopt various control strategies such as constant reactive power or constant voltage control, three-phase balance control or split phase control.

◆ High reliability

The IGBT valve body adopts a horizontal design, which ensures reliable operation and minimal maintenance workload; Simultaneously adopting power unit series connection, redundancy, and bypass measures to improve equipment utilization and reliability.

According to the system application environment and device capacity, forced air cooling, heat pipe cooling, or water air exchange cooling systems are used for users to choose from, with safe and reliable cooling performance and low maintenance costs.

The fully digital intelligent control system has comprehensive control, monitoring, and fault diagnosis functions, greatly reducing the time for debugging, maintenance, and repair.

The control system and power unit use fiber optic communication, which ensures stable signals and is not affected by external electromagnetic fields, effectively solving the isolation problem between strong and weak signals.

The primary circuit has undergone detailed simulation analysis, fully considering various overload, overvoltage, and system disturbance issues. A complete microcomputer protection system can ensure the safe operation and reliable operation of the equipment.

Extremely strong self diagnostic function, including both static self inspection and dynamic detection during operation, can provide accurate alarm and protection actions for various unexpected events in the system in a timely manner.

4. Performance Parameter Table

Item	Parameter
System capacity	±1Mvar~ ±100Mvar
Input line voltage	6kV,10kV,27.5kV,35kV
Valve group structure	Open frame, chain H-bridge power inverter, connected to the power grid through reactors
Cooling method	Pure water cooling/heat pipe/forced air cooling
Control system	Full digital control system
Control method and accuracy	Voltage control, reactive power control or voltage and reactive power combined control, control quantity PCC point voltage; Control accuracy: 0.5%; Trigger accuracy: 0.1° ~0.3°
Reactive power regulation range	-100%~+100%
Adjustment method	Three-phase balance, sub-adjustment
Average power factor	≥0.95
Response time	No more than 5ms
Between control system and power unit	Optical fiber isolation
Total power loss	Under rated conditions, do not exceed 2% of the rated power of the control object
Noise level	Self-cooling no noise ≤52dB; Water cooling ≤78dB
Control voltage	AC380V, AC220V or DC220V
Service life	≥20 years