TH-HVF Series High-voltage Variable-frequency Speed Control System

Classification:

Frequency conversion speed regulation class

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1. Basic Principle

By adopting the advanced power unit series stacking technology, vector control technology, and optimized PWM control algorithm, the 50Hz grid voltage is transformed into sine voltage and sine current output of 0-50Hz (60Hz) variable frequency and variable voltage, and the motor speed is adjusted to meet the urgent requirements of users for speed regulation, energy saving, and production process improvement for fans, water pumps, and other equipment.

2. Performance Features

◆ High efficiency, high power factor, and no harmonic pollution

The TH HVF series high-voltage variable frequency speed control system adopts the high-high scheme of power unit, using a multi-winding high-voltage phase-shifting transformer. The current flowing through the secondary winding forms a sinusoidal current waveform when stacked ot the primary side of the transformer. The power factor is higher than 0.95, and the overall efficiency is higher than 98%. The multi-level technology is used to reduce harmonic amplitude through superposition. The pure harmonic free input has no interference with the power grid, and the output harmonic distortion is less than 2%, meeting and exceeding the requirements of the international standard IEE519 for the power quality public power grid.

◆ Advanced fault unit bypass operation technology

To improve the reliability of the system, a certain output voltage margin is considered in the whole variable frequency speed regulation system, and the bypass circuits are added in each power unit. When a power unit has a fault, it can automatically monitor the fault and start the bypass circuit to prevent the unit from operating again.

Then, through the automatic line voltage balancing technology, the angle between phases is adjusted to ensure the maximum line voltage balanced output under the premise of maximum and unequal phase voltage output.

◆ Reliable oscillation suppression technology

When the motor is lightly loaded or unloaded, local instability may occur, and the current amplitude will fluctuate greatly. The oscillation of the current may cause the system to trigger protection due to overcurrent or overvoltage. Exceptional current oscillation suppression algorithm is used to suppress current oscillation effectively and ensure system stability and reliability.

◆ Flying start function

Flying start, which is also called speed tracking start, is mainly used for starting the motor and switching from power frequency to variable frequency when the fan rotates in positive direction due to external force. If the flying start function is used, the frequency converter will, upon detecting the actual speed of rotor, output the frequency identical to the rotor so as to prevent the electric energy from being back to the DC bus of frequency converter and avoid overvoltage protection, thus starting the electric motor smoothly.

◆ Free switch between power frequency and variable frequency

It supports the free switch between power frequency and variable frequency. Protection shutdown function will not be triggered during the switching process. The switching from variable frequency to power frequency involves detecting the frequency, amplitude, and phase of the power frequency grid, and adjusting the output voltage frequency, amplitude, and phase of the inverter to match those of the grid. Upon receiving the switching command, the inverter is disconnected from the motor, which is then connected to the grid, completing the process of switching from variable frequency to power frequency. Switching between power frequency and variable frequency means running motor using flying start technology under variable frequency status by connecting the frequency converter and motor after disconnecting the power frequency grid and motor.

◆ Multi-machine master/slave technology

The frequency converter supports master/slave control function. Master/slave control network can be established among various sets of frequency converters through data busbar. To be specific, one frequency converter is set as host machine while the rest ones as slave machines. The host machine collects the information about the status of slave machines in real time and sends the frequency and torque commands of various slave machines at the same time, so as to realize the power balance and integrated control of various frequency converters. The technology is applicable to the scenarios where power balance control is required, such as belt conveyor and elevator.

3. Model Description

4. Performance Parameter Table

Applicable motor power (kW)		200kW~12,000kW (4-pole motor is the standard configuration; 6~12-pole motor is optional based on the specific current requirements)
Rated output	Rated power (kW)	Rated power of rated voltage of motor: 200kW~12,000kW
	Rated current (A)	Rated current of rated voltage of motor
	Overload capacity	105% continuous, 120% 1min allowed, 150% 3s allowed, 180% immediate protection
	Output voltage (kV)	3-phase: 0~6kV, (0~10kV)
	Wave form	Multiple SPWM sine wave
Input voltage	Number of phases, frequency and voltage	3-phase, 50Hz, 6kV(10kV)
Input voltage	Allowed fluctuation	Voltage: -10%~+10%, frequency: ±5%, -15% ~ -35% derated continuous running
Basic performance	Starting frequency	1.1~5Hz (range of setting)
	Precision	Simulation settings: Below 0.3% (25 ±10℃) of the max. frequency value Digital settings: Below 0.1% -10~+50℃) of the max. frequency value
	Resolution	Simulation settings: 0.0005% of the max. frequency value Digital settings: 0.01Hz (below 99.99Hz), 0.1Hz (above 100Hz)
	Efficiency	>98% under rated output
	Power factor	>0.95
Control	Acceleration and deceleration time	0.1~6000.0s, acceleration and deceleration time can be set independently
	Voltage/Frequency characteristics	Decided by the selected V/F curve
	PID	Manual settings of PID parameters
	Auxiliary functions	Setting of V/F curve, low-frequency compensation, rated current and current protection boundary
	High-voltage isolation	Electromagnetic coupling, multi-channel optical fiber transmission
	Input of control power	AC220V 2kVA
Operation	Operation	Operatin of body (touch screen), external control with a long distance and upper computer (optional)
Operation	Frequency setting	Setting of touch screen number, multi-section speed, acceleration/deceleration speed, upper computer and external control simulation signal (DC4 ~20mA)
Operation	Output of running status	Status indication of relay status output, fault of frequency converter, alarm, running/stop
	Touch screen	Input/output voltage, input/output current, setting value, fault and running status of various units, transformer status, bus voltage of various units, temperature of heat radiator of various units, etc.
	Protection functions	Motor overcurrent, overvoltage and undervoltage of machine, overcurrent and overvoltage of unit, unit overheating, phase loss of unit input, communication faults of optical fiber, etc.
	Applicable scenarios	Places with no gas and coal dust explosion dangers, external gas impact, corrosive or conductive gas and dust and direct sunshine with an altitude below 1,000m.
Environment	Ambient temperature/Humidity	0℃ ~+40℃ /20~90%RH non-condensation
	Vibration	5.9m/s2 (below 0.6g)
	Storage temperature	-20~+65℃ (applicable to short-time storage such as transportation)
External interface	Digital input	15 ways in total
	Digital output	15 ways in total
	Simulation input	Two-way 4~20mA (adjustable channel): Frequency setting, pressure feedback and
	Analog output	Four-way 4~20mA (adjustable channel): Output frequency, output current, output voltage and excitation control (used for synchronous motor controll)
	Communication interface	One-way RS485, supporting Modbus or Profibus communication protocol (settable)
Cooling method		Forced air cooling
Protection rating of housing		IP31

5. Selection Reference

Product model	Applicable motor voltage (kV)	Applicable motor power (kW)	Dimensions WDH (mm) (Excluding switch cabinet)
TH-HVF-450/6	6	450	200015001900
TH-HVF-500/6	6	500	200015001900
TH-HVF-560/6	6	560	200015001900
TH-HVF-630/6	6	630	220017002120
TH-HVF-710/6	6	710	220017002120
TH-HVF-800/6	6	800	220017002120

Product model	Applicable motor voltage (kV)	Applicable motor power (kW)	Dimensions WDH (mm) (Excluding switch cabinet)
TH-HVF-900/6	6	900	220017002120
TH-HVF-1000/6	6	1000	220017002120
TH-HVF-1120/6	6	1120	220017002120
TH-HVF-1250/6	6	1250	330017002420
TH-HVF-1400/6	6	1400	330017002420
TH-HVF-1600/6	6	1600	360017002420
TH-HVF-1800/6	6	1800	360017002420
TH-HVF-2000/6	6	2000	360017002420
TH-HVF-2400/6	6	2400	360017002420
TH-HVF-2500/6	6	2500	460017002420
TH-HVF-2800/6	6	2800	460017002420
TH-HVF-3150/6	6	3150	590017002420
TH-HVF-3300/6	6	3300	590017002420
TH-HVF-4000/6	6	4000	650017002420
TH-HVF-4500/6	6	4500	650017002420
TH-HVF-4800/6	6	4800	650017002620
TH-HVF-5000/6	6	5600	650017002620
TH-HVF-220/10	10	220	250016002000
TH-HVF-250/10	10	250	250016002000
TH-HVF-280/10	10	280	250016002000
TH-HVF-315/10	10	315	250016002000
TH-HVF-355/10	10	355	250016002000
TH-HVF-400/10	10	400	250016002000
TH-HVF-450/10	10	450	250016002000

Product model	Applicable motor voltage (kV)	Applicable motor power (kW)	Dimensions WDH (mm) (Excluding switch cabinet)
TH-HVF-500/10	10	500	250016002000
TH-HVF-560/10	10	560	250016002000
TH-HVF-630/10	10	630	250016002000
TH-HVF-710/10	10	710	250016002000
TH-HVF-800/10	10	800	250016002000
TH-HVF-900/10	10	900	250016002000
TH-HVF-1000/10	10	1000	250016002000
TH-HVF-1250/10	10	1250	280017002120
TH-HVF-1400/10	10	1400	280017002120
TH-HVF-1600/10	10	1600	280017002120
TH-HVF-1800/10	10	1800	280017002120
TH-HVF-2000/10	10	2000	280017002120
TH-HVF-2250/10	10	2250	410017002420
TH-HVF-2400/10	10	2400	410017002420
TH-HVF-2500/10	10	2500	410017002420
TH-HVF-2800/10	10	2800	440017002420
TH-HVF-3000/10	10	3000	440017002420
TH-HVF-3200/10	10	3200	440017002420
TH-HVF-3500/10	10	3500	440017002420
TH-HVF-4000/10	10	4000	440017002420
TH-HVF-4500/10	10	4500	620017002620
TH-HVF-4800/10	10	4800	620017002620
TH-HVF-5600/10	10	5600	620017002620

Tenghui TH-HVF High-voltage Variable-frequency Speed Control System Scheme

One-drive-one manual scheme: As the standard configuration of variable-frequency speed control system, it can switch between variable frequency and power frequency of load, to keep safety during maintenance of variable-frequency speed control system.

One-drive-one auto scheme: Realize quick switch between variable frequency and power frequency of load, to keep safety during maintenance of variable-frequency speed control system. This scheme is recommended when the switch time of system is short.

One-drive-two manual scheme: In addition to the functions of one-drive-one system, it can also switch two loads at the same time and satisfy the periodic running of two loads.

One-drive-two auto scheme: In addition to the functions of one-drive-one system, it can realize fast switch between two loads at the same time. This scheme is recommended when the switch time of system is short.

7. Instructions for Ordering

◆ Tenghui TH-HVF high-voltage variable frequency applies to boiler feed pump, circulating pump, condensate pump, mortar pump, supply fan, induced draft fan, primary air fan and booster fan in the power industry; the drain pump, exhaust fan and elevator of mine in the mining industry; blast furnace blower, smelting oxygen generator and dedusting fan in the metallurgical industry; large oil delivery pump and chemical production compressor in the petrochemical industry; the tap water supply pump and central air conditioning compressor in urban construction.

◆ TBP series low-voltage variable-frequency speed control cabinet or TYT series liquid resistance speed control cabinet can be equipped as demanded by user.

Key words:

TH-HVF Series High-voltage Variable-frequency Speed Control Syste

TBP Series Low Voltage Frequency Conversion Control Cabinet

TZT Series DC Motor Governor

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